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WO2013168266A1 - Dispositif d'entraînement - Google Patents

Dispositif d'entraînement Download PDF

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Publication number
WO2013168266A1
WO2013168266A1 PCT/JP2012/062042 JP2012062042W WO2013168266A1 WO 2013168266 A1 WO2013168266 A1 WO 2013168266A1 JP 2012062042 W JP2012062042 W JP 2012062042W WO 2013168266 A1 WO2013168266 A1 WO 2013168266A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
axis
along
magnetic field
base
Prior art date
Application number
PCT/JP2012/062042
Other languages
English (en)
Japanese (ja)
Inventor
純 鈴木
Original Assignee
パイオニア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パイオニア株式会社 filed Critical パイオニア株式会社
Priority to PCT/JP2012/062042 priority Critical patent/WO2013168266A1/fr
Publication of WO2013168266A1 publication Critical patent/WO2013168266A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • G02B26/085—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD the reflecting means being moved or deformed by electromagnetic means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors

Definitions

  • the present invention relates to a technical field of a driving device such as a MEMS scanner that rotates a driven object such as a mirror.
  • MEMS Micro Electro Mechanical System
  • a display field in which light incident from a light source is scanned with respect to a predetermined screen region to embody an image, or light reflected by scanning light with respect to a predetermined screen region.
  • a micro-structured mirror driving device optical scanner or MEMS scanner
  • a mirror driving device includes a fixed main body serving as a base, a mirror that can rotate around a predetermined rotation axis, and a torsion bar (twisting member) that connects or joins the main body and the mirror.
  • the structure provided is known (refer patent document 1).
  • a configuration in which a mirror is driven using a coil and a magnet is generally used.
  • a configuration in which a coil is directly attached to the mirror so as to surround the mirror can be given as an example.
  • a force in the rotational direction is applied to the mirror by the interaction between the magnetic field generated by passing a current through the coil and the magnetic field of the magnet, and as a result, the mirror is rotated.
  • Patent Document 1 described above a configuration is adopted in which the coil and the magnet are arranged so as to cause distortion in the twisting direction (in other words, the rotation axis direction of the mirror) of the torsion bar.
  • the torsion bar is distorted in the twisting direction due to the interaction between the magnetic field generated by passing a current through the coil and the magnetic field of the magnet, and the distortion in the twisting direction of the torsion bar rotates the mirror.
  • the coil since the coil is arranged so as to surround the mirror, the coil becomes relatively large. As a result, the magnet for applying a magnetic field to the coil is also relatively large. This causes a technical problem that the magnetic gap between the coil and the magnet becomes large and the MEMS scanner cannot be downsized.
  • the coil since the coil is arranged so as to surround the mirror, the arrangement of the magnet is limited or it is difficult to arrange the magnet at a suitable position. Specifically, since the reflection of light by the mirror is hindered, it is possible to arrange a magnet above the center of the coil (specifically, above the inside of the coil winding (that is, above the mirror). Have difficulty.
  • the present invention uses a coil and a magnet to drive a mirror (or a driven object to be rotated) while driving a relatively small driving device (that is, It is an object to provide a MEMS scanner.
  • the drive device connects the first base portion, the second base portion supported by the first base portion, the first base portion and the second base portion, and A first elastic portion having elasticity that rotates the second base portion about an axis along another direction as a rotation axis, a rotatable driven portion, and the second base portion and the driven portion are connected to each other.
  • a coil part in which the driven part is disposed outside the winding of the coil part, and a magnetic field applying part that applies a magnetic field to the coil part, and the magnetic field applying part includes: Magnetization is performed on one of the two opposing sides of the coil portion. Along the one direction or the other direction, and the other region portion to which a magnetic field is applied on the other side of the two opposing sides of the coil portion. A magnetic field is applied to the coil portions so as to be offset from each other.
  • the driving apparatus of the present embodiment connects the first base portion, the second base portion supported by the first base portion, the first base portion and the second base portion, and the second base portion.
  • a magnetic field is applied to one of two opposing sides.
  • the region portion and the other region portion to which the magnetic field is applied on the other side of the two opposite sides of the coil portion are offset from each other along the one direction or the other direction.
  • a magnetic field is applied to the coil portion.
  • the first base portion serving as the base and the second base portion supported by the first base portion have the first elastic portion having elasticity (for example, a first torsion bar described later). Etc.) directly or indirectly.
  • the second base portion and a driven portion (for example, a mirror described later) rotatably arranged are directly or by a second elastic portion (for example, a second torsion bar described later) having elasticity. Connected indirectly.
  • the second base portion has elasticity of the first elastic portion (for example, elasticity that allows the second base portion to rotate about an axis along another direction (for example, an X-axis direction described later) as a rotation axis).
  • an axis along another direction different from one direction is rotated as a rotation axis. Therefore, the driven part connected via the second base part and the second elastic part also rotates about the axis along the other direction as the rotation axis.
  • the driven part is made by the elasticity of the second elastic part (for example, the elasticity that the driven part can be rotated about an axis along one direction (for example, a Y-axis direction described later) as a rotation axis).
  • the axis along one direction is rotated as a rotation axis. That is, the driving device of the present embodiment can perform biaxial driving of the driven part.
  • the drive apparatus of this embodiment may perform multi-axis drive (for example, 3-axis drive, 4-axis drive,...) Of the driven part.
  • the second base portion (in other words, the second base portion) has an axis along the other direction as a rotation axis due to the force caused by the electromagnetic interaction between the coil portion and the magnetic field applying portion.
  • the driven part supported by the rotation.
  • the driving force for rotating the second base portion about the axis along the other direction as the rotation axis is an electromagnetic force resulting from the electromagnetic interaction between the coil portion and the magnetic field applying portion.
  • the driven part rotates about the axis along one direction as a rotation axis by the force caused by the electromagnetic interaction between the coil part and the magnetic field applying part.
  • the driving force for the driven part to rotate with the axis along one direction as the rotation axis is an electromagnetic force resulting from the electromagnetic interaction between the coil part and the magnetic field applying part.
  • the coil portion is supplied with a control current for rotating the second base portion about the axis along the other direction as the rotation axis.
  • This control current may be, for example, an alternating current having a frequency that is the same as or synchronized with a frequency (in other words, a cycle) at which the second base portion rotates about an axis along another direction as a rotation axis.
  • the coil portion is supplied with a control current for rotating the driven portion about the axis along one direction as a rotation axis.
  • This control current is preferably an alternating current having a frequency that is the same as or synchronized with a frequency (in other words, a cycle) at which the driven part rotates about an axis along one direction as a rotation axis.
  • the control current is the resonance frequency of the driven part determined by the driven part and the second elastic part (more specifically, the driven frequency determined by the moment of inertia of the driven part and the torsion spring constant of the second elastic part). It is preferable that the alternating current has the same frequency as the resonance frequency of the part or a synchronized frequency.
  • the magnetic field applying unit includes one area portion to which a magnetic field is applied on one of the two opposing sides of the coil unit, and the other side of the two opposing sides of the coil unit.
  • the magnetic field is applied to the coil portion so that the other region portion to which the magnetic field is applied is offset from each other along one direction or the other direction.
  • the magnetic field application unit applies a magnetic field to the coil unit, the one region part to which the magnetic field is applied on one of the two opposing sides of the coil unit and the coil unit facing each other The other region portion to which the magnetic field is applied on the other side of the two sides is offset from each other along one direction or the other direction.
  • a Lorentz force is generated in the coil portion due to electromagnetic interaction between the control current supplied to the coil portion and the magnetic field applied by the magnetic field applying portion.
  • this Lorentz force is a rotational force around the axis along the other direction, as will be described in detail later with reference to the drawings. Acts on the coil section.
  • the second base portion rotates about the axis along the other direction as the rotation axis.
  • the Lorentz force causes the second base portion to deform and vibrate, as will be described in detail later.
  • the driven portion rotates about the axis along one direction as the rotation axis.
  • the coil portion is disposed on the second base portion so that the driven portion is disposed outside the winding.
  • the coil part is arranged on the second base part so that the driven part is not arranged inside the winding. That is, the coil part is disposed at a position offset in a predetermined direction (for example, another direction (for example, an X-axis direction described later)) from a position where the driven part is disposed. More specifically, the coil portion is arranged such that the center of the coil portion (for example, the center of the winding) is disposed at a position offset in a predetermined direction from the position where the center of the driven portion is disposed. Arranged on the part.
  • a coil part is arrange
  • the driven part is located outside the winding of the coil part. Therefore, the coil part may not be arranged so as to surround the driven part.
  • the size of the coil portion (for example, the diameter of the winding or the length of the winding) is relatively compared to the case where the coil portion is disposed so as to surround the driven portion. Can be small.
  • the size of the coil portion (for example, the diameter of the winding wire or the length of the winding wire) can be relatively reduced regardless of the size of the driven portion.
  • the size of the magnetic field application part for example, magnet for applying a magnetic field to the coil part can also be relatively reduced.
  • a magnetic gap between a coil part and a magnetism giving part is set. It can be made relatively small. Therefore, in the present embodiment, the size of the driving device can be suitably reduced as compared with the case where the coil portion is disposed so as to surround the driven portion.
  • the coil part does not have to be arranged so as to surround the driven part. Therefore, the arrangement of the magnetic field applying part is compared with the driving device in which the coil part is arranged so as to surround the driven part. The degree of freedom becomes relatively high. For this reason, a magnetic field provision part can be arrange
  • the magnetic field is applied to one region portion to which a magnetic field is applied on one of the two opposing sides of the coil portion, and to the other side of the two opposing sides of the coil portion.
  • the magnetic field is applied so that the other region portion to which is applied is offset from each other along one direction or the other direction. Therefore, in this embodiment, as will be described in detail later with reference to the drawings, a magnetic field applying unit for applying a magnetic field that crosses the coil unit along one direction and a magnetic field that crosses the coil unit along the other direction. Even if the magnetic field application unit for applying the magnetic field is not separately provided independently, the driven part is driven in two axes.
  • the driven part in addition to the coil part in which the driven part is located outside the winding, the driven part may further include another coil part located inside the winding. That is, it is not required that the driven part is located outside the windings of all the coil parts included in the driving device. In other words, it suffices if the driven part is located outside the winding of at least one of the coil parts of the driving device.
  • a plurality of coil parts may be constituted by a single winding. Even in this case, after substantially distinguishing each of a plurality of coil parts constituted by a single winding according to the arrangement position, shape, etc., a plurality of coil parts constituted by a single winding While the driven part is located outside the winding of one of the coil parts, the driven part is driven inside the winding of the other coil part of a plurality of coil parts composed of a single winding. The part may be located.
  • the magnetic field applying unit may cross the coil unit along the direction that obliquely intersects the one direction or the other direction with respect to the coil unit. Is granted.
  • a magnetic field is applied to the coil unit from the magnetic field applying unit.
  • the magnetic field application unit applies a magnetic field that crosses the coil unit along a direction that intersects obliquely with respect to one direction or a direction that intersects obliquely with respect to another direction.
  • intersecting at an angle means to intersect at an angle other than 90 degrees or an angle that is a multiple of 90 degrees.
  • one area part to which a magnetic field is applied at one of the two opposing sides of the coil part and the other magnetic field is applied to the other of the two opposing sides of the coil part It is relatively easy to realize a state in which the region portions are offset from each other along one direction or the other direction.
  • the magnetic field applying unit is A magnetic field is applied across two opposing sides obliquely along the diagonal direction.
  • the magnetic field applying portion intersects obliquely with respect to one direction or obliquely with respect to another direction.
  • the magnetic field which crosses a coil part along a direction can be provided suitably.
  • the magnetic field applying portion includes a pair of magnetic bodies that sandwich the coil portion.
  • the pair of magnetic bodies are arranged at positions offset from each other along the one direction or along the other direction.
  • the position at which one magnetic body of the pair of magnetic bodies is disposed is one direction or the other based on the position at which the other magnetic body of the pair of magnetic bodies is disposed. It is displaced along the direction (in other words, it is offset). Therefore, the magnetic field applying unit including such a pair of magnetic bodies relatively easily generates a magnetic field that crosses the coil unit along a direction obliquely intersecting one direction or a direction obliquely intersecting the other direction. Can be granted.
  • the pair of magnetic bodies may be arranged at point-symmetric positions with respect to the center of the coil unit. .
  • the magnetic field provision part can provide the magnetic field which crosses a coil part comparatively easily along the direction which crosses diagonally with respect to one direction, or the direction which crosses diagonally with respect to another direction. it can.
  • the magnetic field application unit includes: (i) a pair of magnetic bodies that sandwich the coil unit; and (ii-1) one of the pair of magnetic bodies. An applied magnetic field is guided to the other magnetic body of the pair of magnetic bodies, and (ii-2) the one of the coil sections on the path of the magnetic field between one end and the one magnetic body. And (ii-3) a magnetic yoke in which the other region portion of the coil portion is present on the magnetic field path between the other end and the other magnetic body. Yes.
  • the magnetic yoke in one region portion to which a magnetic field is applied on one of the two opposing sides of the coil portion, is directed from one magnetic body to one end of the magnetic yoke. A magnetic field directed from one end of the magnetic head toward one magnetic body is applied.
  • the other region portion to which the magnetic field is applied on the other side of the two opposing sides of the coil portion is directed from the other magnetic body toward the other end of the magnetic yoke or on the other side of the magnetic yoke.
  • a magnetic field from the end toward the other magnetic body is applied.
  • one area part to which a magnetic field is applied at one of the two opposing sides of the coil part and the other magnetic field is applied to the other of the two opposing sides of the coil part. It is relatively easy to realize a state in which the region portions are offset from each other along one direction or the other direction.
  • the rotation axis along the one direction of the coil part is different from the rotation axis along the one direction of the driven part.
  • the rotation axis along one direction of the coil part (however, in this embodiment, (i) the actual rotation when the coil part actually rotates with the axis along one direction as the rotation axis) A rotation axis, or (ii) a virtual rotation axis when the coil portion is assumed to rotate with an axis along one direction as the rotation axis) and one of the driven parts It is not necessary to match the rotation axis along the direction. For this reason, compared with the drive device which needs to make the rotating shaft along one direction of a coil part and the rotating shaft along one direction of a driven part correspond, the freedom degree of arrangement of a driven part is Relatively high. For this reason, the driven part is easily located outside the winding of the coil part. Therefore, the various effects described above are suitably realized.
  • the rotation axis along one direction of the coil part is preferably shifted along the other direction from the rotation axis along one direction of the driven part. That is, the coil part is arranged on the second base part so that the center of the coil part (for example, the center of the winding) is arranged at a position shifted from the center of the driven part along the other direction. Preferably it is.
  • the Lorentz force generated in the coil unit due to electromagnetic interaction between the control current supplied to the coil unit and the magnetic field applied by the magnetic field applying unit The coil portion rotates with the axis along the other direction as a rotation axis, and due to the rotation of the coil portion with the axis along the other direction as the rotation axis, the second base portion is The second base portion is rotated along the other direction due to the rotation of the coil portion with the axis along the other direction as the rotation axis and the axis along the other direction as the rotation axis. Due to the deformation vibration of the second base portion, the driven portion rotates about the axis along the one direction as a rotation axis.
  • the driven part rotates about the axis along one direction as the rotation axis by the force caused by the electromagnetic interaction between the coil part and the magnetic field applying part, and along the other direction.
  • the second base portion rotates with the shaft as a rotation axis.
  • the coil portion is supplied with a control current for rotating the second base portion about the axis along the other direction as the rotation axis.
  • the coil portion is supplied with a control current for rotating the driven portion about the axis along one direction as a rotation axis.
  • a magnetic field is applied to the coil unit from the magnetic field applying unit.
  • a Lorentz force is generated in the coil unit.
  • this Lorentz force acts as a rotational force around the axis along the other direction.
  • the coil portion rotates about the axis along the other direction as a rotation axis (more specifically, reciprocatingly drives to rotate).
  • Lorentz forces acting in different directions are simultaneously applied to the two sides of the coil unit facing along one direction. It is preferable to add.
  • the Lorentz force applied to the coil portion at a certain timing is a force that acts as an upward force on one of the two sides of the coil portion that are opposed in one direction and is in one direction. It is preferable that the force acts as a downward force on the other side of the two sides of the coil portion facing along.
  • the Lorentz force applied to the coil portion at another timing that is in tandem with the one timing is a force that acts as a downward force on one of the two sides of the coil portion that are opposed along the one direction. It is preferable that the force acts as an upward force on the other of the two sides of the coil portion facing in the one direction.
  • the coil portion rotates with an axis along another direction as a rotation axis.
  • the second base part on which the coil part is arranged rotates about the axis along the other direction as the rotation axis.
  • the second base portion on which the coil portion is disposed becomes a standing wave shape along the other direction (that is, the stationary wave It will deform and vibrate.
  • the coil portion includes not only a control current for rotating the second base portion with the axis along the other direction as a rotation axis, but also a driven portion with the axis along one direction as the rotation axis.
  • a control current for rotation is also supplied. That is, according to the control current for rotating the driven part about the axis along one direction as the rotation axis, the second base part has a standing wave shape along the other direction (that is, a standing wave shape). ) Deformation vibration.
  • the external appearance of the second base portion is deformed so that a part thereof becomes an antinode of deformation vibration and the other part becomes a node of deformation vibration. Due to the deformation vibration of the second base portion, a belly and a node appear along other directions. Since the deformation vibration of the second base portion is performed in accordance with a so-called standing wave waveform, the positions of its antinodes and nodes are substantially fixed. At this time, the deformation vibration of the second base portion may be resonance.
  • the resonance frequency at which the second base portion resonates (that is, the frequency of deformation vibration of the base portion) may be the same as the frequency at which the driven portion rotates (or the resonance frequency of the driven portion).
  • the driven part rotates about the axis along one direction as a rotation axis.
  • the driven part is driven by the resonance frequency of the driven part determined by the driven part and the second elastic part (more specifically, the driven frequency determined by the moment of inertia of the driven part and the torsion spring constant of the second elastic part). May be rotated with an axis along one direction as a rotation axis so as to resonate at a resonance frequency of the portion.
  • the rotation portion along the one direction of the coil portion and the rotation axis along the one direction of the driven portion are located at locations corresponding to the rotation axis along the one direction.
  • the driven part is connected to the location corresponding to the node in the deformation vibration of the second base part.
  • a coil portion is disposed at a location corresponding to a node in the deformation vibration of the second base portion.
  • the rotation direction of the coil portion having the axis along the one direction as the rotation axis and the axis along the one direction as the rotation axis are used.
  • the directions of rotation of the driven parts are opposite to each other.
  • the driven part rotates the axis along the one direction using the deformation vibration of the second base part caused by the rotation of the coil part whose axis is the axis along the one direction. It preferably rotates as a shaft.
  • the second base portion deforms and vibrates in a higher order vibration mode, it corresponds to the rotational direction of the driven portion and the driven portion with the axis along one direction as the rotation axis (for example, the driven portion
  • the rotation direction of the second base portion may be reversed.
  • the rotation direction of the coil portion having the axis along one direction as the rotation axis and the rotation direction of the driven portion having the axis along the one direction as the rotation axis may be the same direction.
  • the first base portion, the second base portion, the first elastic portion, and the driven portion disposed outside the winding of the coil portion, A second elastic portion; a coil portion; and a magnetic field applying portion, wherein the magnetic field applying portion includes one region portion to which a magnetic field is applied in one of two opposing sides of the coil portion, and the coil portion.
  • the magnetic field is applied to the coil portion so that the other region portion to which the magnetic field is applied on the other side of the two opposite sides is offset from each other along one direction or the other direction.
  • FIG. 1 is a plan view conceptually showing the structure of the MEMS scanner 101 according to the first embodiment.
  • the MEMS scanner 101 includes a base 110, torsion bars 120a and 120b, a mirror 130, a coil 140, and magnets 151 and 152.
  • the base 110 has a frame shape with a gap inside. That is, the base 110 has two sides extending in the Y-axis direction in FIG. 1 and two sides extending in the X-axis direction (that is, a direction orthogonal to the Y-axis direction) in FIG. It has a frame shape having a gap surrounded by two sides extending in the axial direction and two sides extending in the X-axis direction.
  • the base 110 has a square shape, but is not limited thereto, and other shapes (for example, a rectangular shape such as a rectangle or a circular shape) may be used. You may have.
  • the base 110 is a structure that is the basis of the MEMS scanner 101 according to the first embodiment, and is fixed to a substrate or a support member (not shown) (in other words, the inside of the system called the MEMS scanner 100). Is preferably fixed). Alternatively, the base 110 may be suspended by a suspension (not shown).
  • FIG. 1 shows an example in which the base 110 has a frame shape
  • the base 110 may have a U-shape in which a part of the base 110 is an opening.
  • the base 110 may have a box shape with a gap inside. That is, the base 110 is defined by two surfaces distributed on a plane defined by the X axis and the Y axis, and the X axis and a Z axis (not shown) (that is, an axis orthogonal to both the X axis and the Y axis).
  • Each of the torsion bars 120a and 120b is an elastic member such as a spring made of silicon, copper alloy, iron alloy, other metal, resin, or the like.
  • Each of the torsion bars 120a and 120b is arranged to extend in the Y-axis direction in FIG.
  • each of the torsion bars 120a and 120b has a shape having a long side extending in the Y-axis direction and a short side extending in the X-axis direction.
  • each of the torsion bars 120a and 120b may have a shape having a short side extending in the Y-axis direction and a long side extending in the X-axis direction depending on the setting state of the resonance frequency described later. .
  • each of the torsion bars 120 a and 120 b is connected to the base 110.
  • the other end of each of the torsion bars 120 a and 120 b is connected to the mirror 130. That is, the torsion bars 120a and 120b suspend the mirror 130 so as to sandwich the mirror 130 therebetween.
  • the mirror 130 is arranged to be suspended or supported by the torsion bars 120a and 120b in the gap inside the base 110.
  • the mirror 130 is configured to rotate about the axis along the Y-axis direction as a rotation axis by the elasticity of the torsion bars 120a and 120b.
  • the coil 140 is a plurality of windings made of, for example, a material having relatively high conductivity (for example, gold or copper).
  • the coil 140 has a rectangular shape.
  • the length of two sides along the X-axis direction (that is, the direction orthogonal to the direction of the rotation axis of the mirror 130) among the four sides of the coil 140 is the Y-axis direction among the four sides of the coil 140. That is, it is shorter than the length of two sides along the direction of the rotation axis of the mirror 130.
  • the coil 140 includes two long sides facing each other along the X-axis direction and two short sides facing each other along the Y-axis direction. That is, in the first embodiment, the coil 140 has a rectangular shape.
  • the coil 140 may have any shape (for example, a square, a rhombus, a parallelogram, a circle, an ellipse, or any other loop shape).
  • the coil 140 is disposed on the base 110.
  • the coil 140 has an X-axis direction (that is, a direction orthogonal to the direction of the rotation axis of the mirror 130) with reference to the position where the mirror 130 is disposed (particularly, the position where the center or the center of gravity of the mirror 130 is disposed).
  • the coil 140 is located at a position shifted by a predetermined distance along the center of the coil 140 (particularly, the center or the center of gravity of the coil 140 is located).
  • the coil 140 has a base so that the coil 140 is positioned at a position shifted by a predetermined distance along the Y-axis direction (that is, the direction of the rotation axis of the mirror 130) with respect to the position where the mirror 130 is disposed. 110 may be arranged. In addition, the coil 140 is disposed on the base 110 so that the mirror 130 and the coil 140 are aligned along the X-axis direction. As a result, the mirror 130 is positioned outside the winding wire that constitutes the coil 140. In other words, the mirror 130 is not positioned inside the winding wire constituting the coil 140.
  • the coil 140 is supplied with a control current for rotating the mirror 130 from the power supply via the power supply terminal 141 formed on the base 110.
  • the control current is typically an alternating current that includes a signal component having a frequency that is the same as or synchronized with the frequency at which the mirror 130 rotates with the axis along the Y-axis direction as the rotation axis.
  • the power source may be a power source provided in the MEMS scanner 101 itself, or may be a power source prepared outside the MEMS scanner 101.
  • Magnets 151 and 152 are arranged such that magnet 151 and magnet 152 are arranged along the X-axis direction.
  • the magnets 151 and 152 are arranged such that the magnet 151 and the magnet 152 sandwich the coil 140 along the X-axis direction.
  • one of the magnets 151 and 152 is the magnetic flux exit side, and the other of the magnets 151 and 152 is the magnetic flux entrance side.
  • description will be given using an example in which the magnet 151 is on the magnetic flux incident side and the magnet 152 is on the magnetic flux exit side.
  • FIG. 2 is a plan view and a cross-sectional view conceptually showing an operation mode of the MEMS scanner 101 according to the first embodiment.
  • FIGS. 3A and 3B are a plan view and a cross-sectional view conceptually showing a mode of operation by the MEMS scanner 101 according to the first embodiment.
  • FIG. 4 is a sectional view conceptually showing an operation mode of the MEMS scanner 101 according to the first embodiment.
  • a control current is supplied to the coil 140.
  • the control current includes a current component for rotating the mirror 130 about the axis along the Y-axis direction as a rotation axis.
  • the mirror 130 has a resonance frequency determined by the mirror 130 and the torsion bars 120a and 120b (more specifically, a resonance frequency determined by the moment of inertia of the mirror 130 and the torsion spring constant of the torsion bars 120a and 120b). In order to resonate, it rotates with the axis along the Y-axis direction as the rotation axis.
  • the resonance frequency determined by the mirror 130 and the torsion bars 120a and 120b is finely corrected in consideration of the mass and the moment of inertia of the base 110 that supports the torsion bars 120a and 120b.
  • the control current is an alternating current including a signal component having a frequency that is the same as or synchronized with the resonance frequency of the mirror 130.
  • the mirror 130 may rotate around the axis along the Y-axis direction at a frequency different from or not synchronized with the resonance frequency determined by the mirror 130 and the torsion bars 120a and 120b.
  • the control current is an alternating current including a signal component having a frequency that is the same as or synchronized with the frequency at which the mirror 130 rotates with the axis along the Y-axis direction as the rotation axis.
  • a magnetic field is applied to the coil 140 from the magnets 151 and 152.
  • the magnets 151 and 152 preferably apply a magnetic field to the two sides of the coil 140 facing in the X-axis direction. In this case, the magnets 151 and 152 do not need to apply a magnetic field to the two sides of the coil 140 facing in the Y-axis direction.
  • the magnets 151 and 152 may apply a magnetic field to the two sides of the coil 140 facing each other along the Y-axis direction.
  • the magnets 151 and 152 leak the magnetic field applied to the two sides of the coil 140 facing in the Y-axis direction with respect to the two sides of the coil 140 facing in the Y-axis direction. Only magnetic flux may be applied.
  • FIG. 2A the control current flowing in the clockwise direction in FIG. 2A is supplied to the coil 140, and the magnetic field from the magnet 152 toward the magnet 151 is applied to the coil 140.
  • FIG. 2B which is a drawing of the MEMS scanner 101 shown in FIG. 2A observed from the direction of arrow II, the two long sides of the coils 140 facing each other along the X-axis direction are shown.
  • a Lorentz force in the lower direction in FIG. 2B is generated on the long side on the right side (that is, the outside in FIG. 2A).
  • FIG. 2B which is a drawing of the MEMS scanner 101 shown in FIG. 2A observed from the direction of arrow II
  • the control current is an alternating current
  • the control current flowing in the counterclockwise direction in FIG. 3A is supplied to the coil 140 as shown in FIG.
  • a situation in which a magnetic field directed to the magnet 151 is applied to the coil 140 occurs following the situation shown in FIG.
  • FIG. 3B which is a drawing of the MEMS scanner 101 shown in FIG. 3A observed from the direction of arrow III
  • the two long sides of the coil 140 facing each other along the X-axis direction are shown.
  • a Lorentz force in the upper direction in FIG. 3B is generated on the long side on the right side (that is, the outer side in FIG. 3A).
  • FIG. 3B which is a drawing of the MEMS scanner 101 shown in FIG. 3A observed from the direction of arrow III
  • the coil 140 rotates about the axis along the Y-axis direction as a rotation axis (more specifically, reciprocatingly drives to rotate).
  • the rotation axis of the coil 140 along the Y-axis direction is different from the rotation axis of the mirror 130 along the Y-axis direction.
  • the rotation axis of the coil 140 along the Y-axis direction exists at a position shifted by a predetermined distance in the X-axis direction with respect to the rotation axis of the mirror 130 along the Y-axis direction. For this reason, the rotation of the coil 140 with the axis along the Y-axis direction as the rotation axis does not directly rotate the mirror 130 with the axis along the Y-axis direction as the rotation axis.
  • a slight vibration propagates from the coil 140 to the base 110 along with the rotation of the coil 140 whose axis is the axis along the Y-axis direction.
  • the base 110 on which the coil 140 is disposed deforms and vibrates in a standing wave shape (that is, in a standing wave shape) along the X-axis direction.
  • the base 110 deforms and vibrates so as to wave along the X-axis direction.
  • the appearance of the base 110 is deformed so that one part thereof becomes an antinode of deformation vibration and the other part becomes a node of deformation vibration.
  • the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis. At this time, the mirror 130 rotates so as to resonate at a resonance frequency (for example, 20 kHz) determined according to the mirror 130 and the torsion bars 120a and 120b.
  • a resonance frequency for example, 20 kHz
  • the mirror 130 is Resonance frequency (or (1 / (2 ⁇ )) ⁇ ⁇ (k / I) specified by (1 / (2 ⁇ )) ⁇ ⁇ (k / I) N times or 1 / N times (however, N is rotated about an axis along the Y-axis direction so as to resonate at a resonance frequency of 1).
  • the base 110 is not deformed and oscillated along the X-axis direction. For this reason, the mirror 130 is also not rotated about the axis along the Y-axis direction as the rotation axis.
  • the base 110 140 oscillates and deforms along the X-axis direction so that a position corresponding to the rotation axis along the Y-axis direction of 140 (ie, a position located on the rotation axis along the Y-axis direction of the coil 140) becomes a node.
  • the base 110 has a portion corresponding to the rotation axis along the Y-axis direction of the mirror 130 (that is, a position located on the rotation axis along the Y-axis direction of the mirror 130) as a node.
  • the base 110 has an antinode such that an antinode exists between a location corresponding to the rotation axis along the Y-axis direction of the coil 140 and a location corresponding to the rotation axis along the Y-axis direction of the mirror 130. It begins to deform and vibrate along the axial direction. That is, antinodes and nodes appear along the X-axis direction due to the deformation vibration of the base 110.
  • the deformation vibration of the base 110 is performed in accordance with a so-called standing wave waveform, the positions of the antinodes and nodes are substantially fixed. At this time, the frequency of deformation vibration of the base 110 is typically the same as the resonance frequency of the mirror 130 described above.
  • the rigidity of the base 110 may be adjusted.
  • the rigidity of the base 110 may be relatively high and the rigidity of the base 110 may be relatively low.
  • a rib may be formed at a node portion of the base 110 and a rib may not be formed at a belly portion of the base 110.
  • the portion of the base 110 where the rib is formed has a relatively high rigidity, it is difficult to bend as the coil 140 rotates, whereas the portion of the base 110 where the rib is not formed has a rigidity. Since it is relatively low, it tends to bend as the coil 140 rotates.
  • the base 110 deforms and vibrates so as to wave along the direction of the X axis, with a portion where the rib is formed as a node and a portion where the rib is not formed as a belly.
  • the base 110 deforms and vibrates to have an appearance like a standing wave. That is, the base 110 has an appearance such that a standing wave appears along a direction orthogonal to the rotation axis of the mirror 130 (that is, the X-axis direction).
  • the mirror 130 rotates with the axis along the Y-axis direction as the rotation axis in accordance with the deformation vibration of the base 110.
  • the rotation direction of the coil 140 and the rotation direction of the mirror 130 are opposite to each other.
  • the mirror 130 in a state where the coil 140 is rotated counterclockwise, the mirror 130 is rotated clockwise.
  • FIGS. 4C to 4G when the coil 140 is rotating clockwise, the mirror 130 rotates counterclockwise.
  • the coil 140, the base 110, and the mirror 130 in the state shown in FIG. 4G subsequently transition to the state shown in FIG. 4A after passing through the state shown in FIG. Thereafter, the coil 140, the base 110, and the mirror 130 are deformed or rotated according to the time series shown in FIGS. 4 (a) to 4 (g).
  • the deformation mode of the base 110 shown in FIGS. 4A to 4G is merely an example, and the base 110 is deformed in another deformation mode (for example, a deformation mode having more nodes). You may vibrate.
  • 4 (a) to 4 (g) show an example in which the rotating direction of the coil 140 and the rotating direction of the mirror 130 are opposite to each other. Strictly speaking, this example can be expressed as an example in which the rotation direction of the coil 140 and the rotation direction of the base 110 in the portion supporting the mirror 130 are opposite to each other.
  • the base 110 when the base 110 is deformed and oscillated in a higher-order vibration mode (for example, a vibration mode in which the number of nodes and abdomen increases as compared with the state shown in FIGS. 4A to 4G).
  • a higher-order vibration mode for example, a vibration mode in which the number of nodes and abdomen increases as compared with the state shown in FIGS. 4A to 4G.
  • the rotation direction of the mirror 130 and the rotation direction of the base 110 in the portion supporting the mirror 130 may be reversed. That is, the rotation direction of the coil 140 and the rotation direction of the mirror 130 may be the same.
  • the MEMS scanner 101 of the first embodiment can rotate the mirror 130 about the axis along the Y-axis direction as the rotation axis. That is, the MEMS scanner 101 of the first embodiment can drive the mirror 130 uniaxially.
  • the mirror 130 is located outside the winding of the coil 140. Therefore, the coil 140 may not be disposed so as to surround the mirror 130.
  • the size of the coil 140 (for example, the diameter of the winding, the length of the winding, etc.) compared to the MEMS scanner of the comparative example in which the coil 140 is disposed so as to surround the mirror 130. Can be made relatively small. In other words, in the first embodiment, the size of the coil 140 can be relatively reduced regardless of the size of the mirror 130. As a result, the sizes of the magnets 151 and 152 for applying a magnetic field to the coil 140 can also be made relatively small.
  • the coil 140 and the magnets 151 and 152 are not related to each other regardless of the size of the mirror 130.
  • the magnetic gap can be made relatively small. Therefore, in the first embodiment, the MEMS scanner 101 can be reduced in size as compared with the comparative MEMS scanner in which the coil 140 is disposed so as to surround the mirror 130.
  • the coil 140 need not be arranged so as to surround the mirror 130.
  • positioning of the magnets 151 and 152 becomes relatively high.
  • the magnets 151 and 152 can be disposed above the center of the coil 140 (specifically, above the inside of the winding of the coil 140).
  • the magnets 151 and 152 do not block the optical path above the mirror 130. Therefore, the freedom degree of arrangement
  • torsion bars 120 a and 120 b connected to the mirror 130 are connected to locations corresponding to nodes in the deformation vibration of the base 110. That is, the part corresponding to the node in the deformation vibration of the base 110 coincides with the rotation axis of the mirror 130 along the Y-axis direction.
  • the coil 140 is disposed at a location corresponding to a node in the deformation vibration of the base 110. That is, the part corresponding to the node in the deformation vibration of the base 110 coincides with the rotation axis of the coil 140 along the Y-axis direction.
  • the vertical direction of the mirror 130 and the coil 140 (specifically, the direction perpendicular to the X-axis direction and the Y-axis direction, respectively, and perpendicular to the surface of the base 110) Axial movement) can be prevented. Therefore, highly accurate rotational driving of the mirror 130 can be realized.
  • the Lorentz force generated in the coil 140 is, for example, as described in Japanese Patent No. 4827993, “a slight vibration (that is, a force having no directivity, and the torsion bars 120a and 120b are applied to the mirror 130. As a force that does not directly act to twist in the direction of rotation). In this case, the Lorentz force is propagated to the base 110 as a slight vibration, so that the base 110 undergoes deformation vibration. That is, the Lorentz force as fine vibration appears in the form of deformation vibration of the base 110.
  • the Lorentz force generated in the coil 140 is disclosed, for example, on the website of the National Institute of Advanced Industrial Science and Technology (http://www.aist.go.jp/aist_j/press_release/pr2010/pr20100209/pr20100209.html). As shown, it may be propagated to the base 110 as a “Lamb wave”. In this case, the Lorentz force is propagated to the base 110 as a Lamb wave, so that the base 110 undergoes deformation vibration. The same applies to the following second to sixth embodiments.
  • FIG. 5 is a plan view conceptually showing the structure of the MEMS scanner 102 according to the second embodiment.
  • the MEMS scanner 101 includes a first base 110-1, a first torsion bar 120a-1, a first torsion bar 120b-1, and a second base 110-2. And a second torsion bar 120a-2, a second torsion bar 120b-2, a mirror 130, a coil 140, magnets 151 and 152, and magnets 161 and 162.
  • the first base 110-1 has a frame shape with a gap inside. That is, the first base 110-1 has two sides extending in the Y-axis direction in FIG. 5 and two sides extending in the X-axis direction (that is, a direction orthogonal to the Y-axis direction) in FIG. And a frame shape having a gap surrounded by two sides extending in the Y-axis direction and two sides extending in the X-axis direction.
  • the first base 110-1 has a square shape.
  • the first base 110-1 is not limited to this. For example, other shapes (for example, a rectangular shape such as a rectangle or a circular shape) Shape etc.).
  • the first base 110-1 is a structure that is the basis of the MEMS scanner 102 according to the second embodiment, and is fixed to a substrate or a support member (not shown) (in other words, the MEMS scanner 102). It is preferably fixed inside the system. Alternatively, the first base 110-1 may be suspended by a suspension (not shown) or the like.
  • FIG. 5 shows an example in which the first base 110-1 has a frame shape, but it goes without saying that the first base 110-1 may have other shapes.
  • the first base 110-1 may have a U-shape in which a part of the first base 110-1 is an opening.
  • the first base 110-1 may have a box shape with a gap inside. That is, the first base 110-1 is orthogonal to the two surfaces distributed on the plane defined by the X axis and the Y axis, and the Z axis (not shown) (that is, both the X axis and the Y axis).
  • the shape of the first base 110-1 may be arbitrarily changed according to the manner in which the mirror 130 is disposed.
  • Each of the first torsion bars 120a-1 and 120b-1 is an elastic member such as a spring made of, for example, silicon, copper alloy, iron alloy, other metal, resin, or the like.
  • Each of the first torsion bars 120a-1 and 120b-1 is disposed so as to extend in the X-axis direction in FIG. In other words, each of the first torsion bars 120a-1 and 120b-1 has a shape having a long side extending in the X-axis direction and a short side extending in the Y-axis direction.
  • each of the first torsion bars 120a-1 and 120b-1 has a shape having a short side extending in the X-axis direction and a long side extending in the Y-axis direction depending on the setting state of the resonance frequency described later. You may have.
  • One end of each of the first torsion bars 120a-1 and 120b-1 is connected to the first base 110-1.
  • the other ends of the first torsion bars 120a-1 and 120b-1 are connected to the second base 110-2.
  • the first torsion bars 120a-1 and 120b-1 suspend the second base 110-2 so as to sandwich the second base 110-2 therebetween.
  • the second base 110-2 has a frame shape with a gap inside. That is, the second base 110-2 has two sides extending in the Y-axis direction in FIG. 5 and two sides extending in the X-axis direction in FIG. It has a frame shape having a gap surrounded by the side and two sides extending in the X-axis direction. In the example shown in FIG. 5, the second base 110-2 has a square shape. However, the second base 110-2 is not limited to this. For example, other shapes (for example, a rectangular shape such as a rectangle or a circular shape) Shape etc.).
  • the second base 110-2 is arranged to be suspended or supported by the first torsion bars 120a-1 and 120b-1 in the gap inside the first base 110-1.
  • the second base 110-2 is configured to rotate about the axis along the X-axis direction by the elasticity of the first torsion bars 120a-1 and 120b-1.
  • FIG. 5 shows an example in which the second base 110-2 has a frame shape
  • the second base 110-2 may have other shapes.
  • the second base 110-2 may have a U-shape in which a part of the second base 110-2 is an opening.
  • the second base 110-2 may have a box shape with a gap inside. That is, the second base 110-2 is orthogonal to the two surfaces distributed on the plane defined by the X axis and the Y axis, and the Z axis (not shown) (that is, both the X axis and the Y axis).
  • the shape of the second base 110-2 may be arbitrarily changed according to the manner in which the mirror 130 is disposed.
  • Each of the second torsion bars 120a-2 and 120b-2 is a member having elasticity such as a spring made of, for example, silicon, copper alloy, iron alloy, other metal, resin, or the like.
  • Each of second torsion bars 120a-2 and 120b-2 is arranged to extend in the Y-axis direction in FIG. In other words, each of the second torsion bars 120a-2 and 120b-2 has a shape having a long side extending in the Y-axis direction and a short side extending in the X-axis direction.
  • each of the second torsion bars 120a-2 and 120b-2 has a shape having a short side extending in the Y-axis direction and a long side extending in the X-axis direction, depending on the setting state of the resonance frequency described later. You may have.
  • One end of each of the second torsion bars 120a-2 and 120b-2 is connected to the second base 110-2.
  • the other ends of the second torsion bars 120 a-2 and 120 b-2 are connected to the mirror 130. That is, the second torsion bars 120a-2 and 120b-2 suspend the mirror 130 so as to sandwich the mirror 130 therebetween.
  • the mirror 130 is arranged to be suspended or supported by the second torsion bars 120a-2 and 120b-2 in the gap inside the second base 110-2.
  • the mirror 130 is configured to rotate about the axis along the Y-axis direction as a rotation axis by the elasticity of the second torsion bars 120a-2 and 120b-2.
  • the coil 140 is a plurality of windings made of, for example, a material having relatively high conductivity (for example, gold or copper).
  • the coil 140 has a rectangular shape.
  • the lengths of the four sides of the coil 140 are substantially the same. That is, in the second embodiment, the coil 140 has a square shape.
  • the coil 140 may have an arbitrary shape (for example, a rectangle, a rhombus, a parallelogram, a circle, an ellipse, or any other loop shape).
  • the coil 140 is disposed on the second base 110-2.
  • the coil 140 has an X-axis direction (that is, a direction orthogonal to the direction of the rotation axis of the mirror 130) with reference to the position where the mirror 130 is disposed (particularly, the position where the center or the center of gravity of the mirror 130 is disposed). Is arranged on the second base 110-2 so that the coil 140 is located at a position shifted by a predetermined distance along the center of the coil 140 (particularly, the center or center of gravity of the coil 140 is located).
  • the coil 140 is positioned so that the coil 140 is positioned at a position shifted by a predetermined distance along the Y-axis direction (that is, the direction of the rotation axis of the mirror 130) with respect to the position where the mirror 130 is disposed. 2 may be arranged on the base 110-2.
  • the coil 140 is disposed on the second base 110-2 so that the mirror 130 and the coil 140 are aligned along the X-axis direction.
  • the mirror 130 is positioned outside the winding wire that constitutes the coil 140. In other words, the mirror 130 is not positioned inside the winding wire constituting the coil 140.
  • the coil 140 is supplied with a control current for rotating the mirror 130 and the second base 110-2 from the power supply via the power supply terminal 141 formed on the second base 110-2.
  • the control current is typically a signal component having a frequency that is the same as or synchronized with the frequency of rotation of the mirror 130 about the axis along the Y-axis direction and the second axis about the axis along the X-axis direction. This is an alternating current including both signal components having the same or synchronized frequency as the frequency at which the base 110-2 rotates.
  • the power source may be a power source provided in the MEMS scanner 102 itself or a power source prepared outside the MEMS scanner 102.
  • a current component for rotating the mirror 130 with the axis along the Y-axis direction as a rotation axis in the control current is referred to as “Y-axis drive control current”.
  • a current component for rotating the second base 110-2 with the axis along the X-axis direction as the rotation axis in the control current is referred to as “X-axis drive control current”.
  • Magnets 151 and 152 are arranged such that magnet 151 and magnet 152 are arranged along the X-axis direction.
  • the magnets 151 and 152 are arranged such that the magnet 151 and the magnet 152 sandwich the coil 140 along the X-axis direction.
  • one of the magnets 151 and 152 is the magnetic flux exit side, and the other of the magnets 151 and 152 is the magnetic flux entrance side.
  • description will be given using an example in which the magnet 151 is on the magnetic flux incident side and the magnet 152 is on the magnetic flux exit side.
  • the magnetic field applied from the magnet 151 and the magnet 152 is mainly used to rotate the mirror 130 about the axis along the Y-axis direction as a rotation axis.
  • a magnetic field applied from the magnets 151 and 152 that is, a magnetic field for rotating the mirror 130 about the axis along the Y-axis direction
  • Y-axis drive a magnetic field applied from the magnets 151 and 152
  • Magnets 161 and 162 are arranged such that magnet 161 and magnet 162 are arranged along the Y-axis direction.
  • the magnets 161 and 162 are arranged such that the magnet 161 and the magnet 162 sandwich the coil 140 along the Y-axis direction.
  • one of the magnets 161 and 162 becomes the magnetic flux output side
  • the other of the magnets 161 and 162 becomes the magnetic flux incidence side.
  • description will be given using an example in which the magnet 161 is on the magnetic flux exit side and the magnet 162 is on the magnetic flux entrance side.
  • the magnetic field applied from the magnet 161 and the magnet 162 is mainly used to rotate the second base 110-2 about the axis along the X-axis direction as a rotation axis. Therefore, in the following description, for convenience of description, a magnetic field applied from the magnets 161 and 162 (that is, a magnetic field for rotating the second base 110-2 around the axis along the X-axis direction) This is referred to as “X-axis driving magnetic field”.
  • FIG. 6 is a plan view and a cross-sectional view conceptually showing a mode of operation by the MEMS scanner 102 according to the second embodiment.
  • FIGS. 7A and 7B are a plan view and a cross-sectional view conceptually showing a mode of operation by the MEMS scanner 102 according to the second embodiment.
  • FIG. 8 is a sectional view conceptually showing an operation mode of the MEMS scanner 102 according to the second embodiment.
  • a control current is supplied to the coil 140.
  • the control current includes a current component (that is, an X-axis drive control current) for rotating the second base 110-2 about the axis along the X-axis direction as a rotation axis.
  • the second base 110-2 rotates at an arbitrary frequency (for example, 60 Hz) with an axis along the X-axis direction as a rotation axis.
  • the X-axis drive control current is an alternating current including a signal component having a frequency that is the same as or synchronized with the frequency of rotation of the second base 110-2 whose axis is the axis along the X-axis direction.
  • the second base 110-2 is a suspended portion including the second base 110-2 (that is, a suspended portion including the second base portion 110-2, the second torsion bars 120a-2 and 120b-2, and the mirror 130).
  • Part) and the resonance frequency determined by the first torsion bars 120a-1 and 120b-1 (more specifically, the inertia moment of the suspended part including the second base 110-2 and the first torsion bars 120a-1 and 120b- (Resonance frequency determined by a torsion spring constant of 1) may be rotated about the axis along the X-axis direction as a rotation axis.
  • a magnetic field for driving the X axis is applied to the coil 140 from the magnets 161 and 162.
  • the magnets 161 and 162 preferably apply an X-axis driving magnetic field to the two sides of the coil 140 facing each other along the Y-axis direction. In this case, the magnets 161 and 162 do not need to apply the X-axis driving magnetic field to the two sides of the coil 140 facing in the X-axis direction.
  • the magnets 161 and 162 may apply an X-axis driving magnetic field to two sides of the coil 140 facing in the X-axis direction.
  • the magnets 161 and 162 may give the leakage flux of the magnetic field for X-axis driving to the two sides of the coil 140 facing in the X-axis direction.
  • FIG. 6A the X-axis drive control current flowing in the clockwise direction in FIG. 6A is supplied to the coil 140, and the X-axis from the magnet 161 toward the magnet 162 is supplied.
  • FIG. 6B which is a drawing of the MEMS scanner 102 shown in FIG. 6A observed from the direction of the arrow VI, of the two sides of the coil 140 facing along the Y-axis direction.
  • a Lorentz force toward the upper direction in FIG. 6B is generated on the right side (that is, the upper side in FIG. 6A).
  • FIG. 6B which is a drawing of the MEMS scanner 102 shown in FIG. 6A observed from the direction of the arrow VI, of the two sides of the coil 140 facing along the Y-axis direction.
  • a Lorentz force toward the upper direction in FIG. 6B is generated on the right side (that is, the upper side in FIG. 6A).
  • FIG. 6B which is a drawing of the MEMS scanner 102 shown in FIG. 6A observed from the direction of
  • FIG. 6B the left side of the two sides of the coil 140 facing in the Y-axis direction (that is, the lower side in FIG. 6A) is shown in FIG.
  • a Lorentz force toward the lower direction in (b) is generated. That is, Lorentz forces in different directions are generated on the two sides of the coil 140 facing each other along the Y-axis direction.
  • Lorentz force which is a couple, is generated on the two sides of the coil 140 facing each other along the Y-axis direction. Accordingly, the coil 140 rotates in the counterclockwise direction in FIG.
  • the X-axis drive control current is an alternating current
  • FIG. 7A the X-axis drive control current flowing in the counterclockwise direction in FIG.
  • FIG. 7B which is a drawing of the MEMS scanner 101 shown in FIG. 7A observed from the direction of the arrow VII, of the two sides of the coil 140 facing each other along the Y-axis direction.
  • a Lorentz force toward the lower side in FIG. 7B is generated on the right side (that is, the upper side in FIG. 7A).
  • FIG. 7B which is a drawing of the MEMS scanner 101 shown in FIG. 7A observed from the direction of the arrow VII
  • the coil 140 rotates about the axis along the X-axis direction as a rotation axis (more specifically, reciprocatingly drives to rotate).
  • the rotation axis of the coil 140 along the X-axis direction overlaps the rotation axis of the second base 110-2 along the X-axis direction.
  • the second base 110-2 also rotates with the axis along the X-axis direction as the rotation axis.
  • the second base 110-2 supports the mirror 130 via the second torsion bars 120a-2 and 120b-2. Therefore, as the second base 110-2 rotates with the axis along the X-axis direction as the rotation axis, the mirror 130 also rotates with the axis along the X-axis direction as the rotation axis.
  • the second base 110-2 also has the axis along the X-axis direction as the rotation axis. Not rotating as. For this reason, the mirror 130 is also not rotated about the axis along the X-axis direction as the rotation axis.
  • the second base 110- 2 when the coil 140 starts to rotate in the counterclockwise direction in FIG. 8B with the axis along the X-axis direction as the rotation axis, the second base 110- 2 also starts to rotate along the counterclockwise direction in FIG. 8B with the axis along the X-axis direction as the rotation axis.
  • the second base 110-2 also moves with the rotation of the coil 140 whose axis is the axis along the X-axis direction. Moreover, it rotates with an axis along the X-axis direction as a rotation axis. For this reason, as shown in FIG. 8 (a) to FIG.
  • the mirror 130 in time series, with the rotation of the second base 110-2 whose axis is the axis along the X-axis direction, the mirror 130 is also Moreover, it rotates with an axis along the X-axis direction as a rotation axis.
  • the coil 140, the second base 110-2, and the mirror 130 in the state shown in FIG. 8 (g) then transition to the state shown in FIG. 8 (a) after passing through the state shown in FIG. 8 (f). Thereafter, the coil 140, the second base 110-2, and the mirror 130 rotate according to the time series shown in FIGS. 8A to 8G.
  • the control current includes a current component (that is, a Y-axis drive control current) for rotating the mirror 130 about the axis along the Y-axis direction as a rotation axis.
  • the mirror 130 has a resonance frequency determined by the mirror 130 and the second torsion bars 120a-2 and 120b-2 (more specifically, the moment of inertia of the mirror 130 and the second torsion bars 120a-2 and 120b-2).
  • the axis rotates along the axis along the Y-axis direction.
  • the Y-axis drive control current is an alternating current including a signal component having a frequency that is the same as or synchronized with the resonance frequency of the mirror 130.
  • the mirror 130 may rotate around the axis along the Y-axis direction at a frequency different from or not synchronized with the resonance frequency determined by the mirror 130 and the second torsion bars 120a-2 and 120b-2.
  • the Y-axis drive control current is an alternating current including a signal component having a frequency that is the same as or synchronized with the frequency at which the mirror 130 rotates with the axis along the Y-axis direction as the rotation axis.
  • a magnetic field for Y-axis driving is applied to the coil 140 from the magnets 151 and 152.
  • the magnets 151 and 152 preferably apply a Y-axis driving magnetic field to the two sides of the coil 140 facing in the X-axis direction. In this case, the magnets 151 and 152 do not need to apply the Y-axis driving magnetic field to the two sides of the coil 140 facing in the Y-axis direction.
  • the magnets 151 and 152 may apply a Y-axis driving magnetic field to the two sides of the coil 140 facing each other along the Y-axis direction.
  • the magnets 151 and 152 may apply only the leakage magnetic flux of the Y-axis driving magnetic field to the two sides of the coil 140 facing in the Y-axis direction.
  • Lorentz force is generated in the coil 140 due to electromagnetic interaction between the Y-axis drive control current supplied to the coil 140 and the Y-axis drive magnetic field applied to the coil 140. Become.
  • the coil 140 rotates about the axis along the Y-axis direction as a rotation axis (more specifically, rotation). To reciprocate).
  • the rotation axis of the coil 140 along the Y-axis direction is different from the rotation axis of the mirror 130 along the Y-axis direction.
  • the rotation axis of the coil 140 along the Y-axis direction exists at a position shifted by a predetermined distance in the X-axis direction with respect to the rotation axis of the mirror 130 along the Y-axis direction. For this reason, the rotation of the coil 140 with the axis along the Y-axis direction as the rotation axis does not directly rotate the mirror 130 with the axis along the Y-axis direction as the rotation axis.
  • the second base 110-2 on which the coil 140 is disposed deforms and vibrates in a standing wave shape (that is, in a standing wave shape) along the X-axis direction.
  • the second base 110-2 is deformed and oscillated so as to wave along the X-axis direction. That is, the appearance of the second base 110-2 is deformed so that a part of the second base 110-2 becomes an antinode of deformation vibration and the other part becomes a node of deformation vibration.
  • the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis. At this time, the mirror 130 rotates so as to resonate at a resonance frequency (for example, 20 kHz) determined according to the mirror 130 and the second torsion bars 120a-2 and 120b-2.
  • a resonance frequency for example, 20 kHz
  • the torsion spring constant when the moment of inertia about the axis along the Y-axis direction of the mirror 130 is I (Y) and the second torsion bars 120a-2 and 120b-2 are regarded as one spring is k ( Y)
  • the mirror 130 has a resonance frequency (or (1 / (2 ⁇ )) ⁇ specified by (1 / (2 ⁇ )) ⁇ ⁇ (k (Y) / I (Y)) ⁇
  • the rotational relationship is that the rotation of the coil 140 with the axis along the Y-axis direction as the rotation axis in the first embodiment, the deformation vibration of the base 110 along the X-axis direction, and the axis along the Y-axis direction as the rotation axis. This is the same as the relationship of rotation of the mirror 130 (see FIG. 4).
  • the MEMS scanner 102 of the second embodiment can rotate the mirror 130 about the axis along the Y-axis direction as the rotation axis.
  • the MEMS scanner 102 of the second embodiment can rotate the second base 110-2 with the axis along the X-axis direction as a rotation axis.
  • the first axis about the axis along the X-axis direction is the rotation axis.
  • the mirror 130 also rotates about the axis along the X-axis direction as the rotation axis. Therefore, the MEMS scanner 102 according to the second embodiment can rotate the mirror 130 about the axis along the X-axis direction as the rotation axis. That is, the MEMS scanner 102 of the second embodiment can drive the mirror 130 biaxially.
  • the mirror 130 is positioned outside the winding of the coil 140. Therefore, the coil 140 may not be disposed so as to surround the mirror 130.
  • the size of the coil 140 (for example, the diameter of the winding, the length of the winding, etc.) compared to the MEMS scanner of the comparative example in which the coil 140 is disposed so as to surround the mirror 130. Can be made relatively small. In other words, in the second embodiment, the size of the coil 140 can be relatively reduced regardless of the size of the mirror 130. As a result, the sizes of the magnets 151 and 152 and the magnets 161 and 162 for applying a magnetic field to the coil 140 can also be relatively reduced.
  • the coil 140, the magnets 151 and 152, and the magnet 161 are compared regardless of the size of the mirror 130, as compared with the MEMS scanner of the comparative example in which the coil 140 is disposed so as to surround the mirror 130.
  • And 162 can be made relatively small. Therefore, in the second embodiment, the size reduction of the MEMS scanner 102 is preferably realized as compared with the MEMS scanner of the comparative example in which the coil 140 is disposed so as to surround the mirror 130.
  • second torsion bars 120a-2 and 120b-2 connected to the mirror 130 are connected to locations corresponding to nodes in the deformation vibration of the second base 110-2. That is, the part corresponding to the node in the deformation vibration of the second base 110-2 coincides with the rotational axis of the mirror 130 along the Y-axis direction.
  • the coil 140 is disposed at a position corresponding to a node in the deformation vibration of the second base 110-2. That is, the portion corresponding to the node in the deformation vibration of the second base 110-2 coincides with the rotation axis of the coil 140 along the Y-axis direction.
  • the mirror 130 and the coil 140 in the vertical direction (specifically, the direction perpendicular to the X-axis direction and the Y-axis direction, respectively, the first base 110-1 or the second base). Movement or vibration in the direction of the Z axis perpendicular to the surface of 110-2 is prevented. Therefore, high-precision rotation of the mirror 130 can be realized.
  • FIG. 9 is a plan view conceptually showing the structure of the MEMS scanner 103 according to the third example.
  • the MEMS scanner 103 of the third embodiment is different from the MEMS scanner 102 of the second embodiment in that the arrangement positions of the magnet 161 and the magnet 162 are changed and the magnet 151 and the magnet 152 are changed. It is different in that it does not have.
  • the other components of the MEMS scanner 103 of the third embodiment may be the same as the other components of the MEMS scanner 102 of the second embodiment.
  • the magnets 161 and 162 are arranged so that the magnet 161 and the magnet 162 sandwich the coil 140 along the Y-axis direction, as in the second embodiment.
  • the magnets 161 and 162 are displaced along the X-axis direction between the magnet 161 (for example, the center of the magnet 161) and the magnet 162 (for example, the center of the magnet 162) (in other words, Offset).
  • the magnet 161 and the magnet 162 may sandwich the coil 140 along the X-axis direction, and the position where the magnet 161 is disposed and the position where the magnet 162 is disposed may be offset along the Y-axis direction.
  • the magnets 161 and 162 are preferably arranged at positions where the magnet 161 and the magnet 162 are point-symmetric with respect to the coil 140. In other words, the magnets 161 and 162 are preferably arranged at positions where the magnet 161 and the magnet 162 are point-symmetric with respect to the center of the winding wire constituting the coil 140.
  • FIG. 10 is a plan view conceptually showing an operation mode of the MEMS scanner 103 according to the third embodiment.
  • a control current (that is, an X-axis drive control current and a Y-axis drive control current) is supplied to the coil 140. Is supplied).
  • a magnetic field is applied to the coil 140 from the magnets 161 and 162.
  • the magnetic field applied from the magnets 161 and 162 is not only used for rotating the mirror 130 about the axis along the Y-axis direction but also the axis along the X-axis direction. Is also used to rotate the second base 110-2 about the rotation axis.
  • the magnets 161 and 162 are arranged in the Y-axis direction.
  • a magnetic field is applied to two sides of the coil 140 facing along the side so as to obliquely cross the two sides.
  • the magnets 161 and 162 apply a magnetic field that intersects the two sides of the coil 140 facing each other along the Y-axis direction at an angle other than 90 degrees with respect to the two sides. That is, the magnets 161 and 162 apply a magnetic field that intersects the two sides of the coil 140 facing each other along the Y-axis direction in the diagonal direction of the winding of the coil 140 to the two sides.
  • the magnets 161 and 162 do not apply a magnetic field to the two sides of the coil 140 facing each other along the X-axis direction.
  • the magnets 161 and 162 give only the leakage flux of the magnetic field to be applied to the two sides of the coil 140 facing in the Y-axis direction to the two sides of the coil 140 facing in the X-axis direction. May be. That is, it is preferable that the magnets 161 and 162 do not positively apply a magnetic field to the two sides of the coil 140 facing each other along the X-axis direction. However, the magnets 161 and 162 may positively apply a magnetic field to the two sides of the coil 140 facing in the X-axis direction.
  • a control current that flows in the clockwise direction in FIG. 10 is supplied to the coil 140, and a magnetic field from the magnet 161 toward the magnet 162 is applied to the coil 140.
  • a magnetic field from the magnet 161 toward the magnet 162 is applied to the coil 140.
  • one of the two sides of the coil 140 facing in the Y-axis direction (for example, the upper side in FIG. 10) is connected to the back side of the paper in FIG. 10.
  • Lorentz force toward the front side of the page is generated.
  • the magnetic field is applied so as to obliquely cross the two sides of the coil 140 facing along the Y-axis direction, this Lorentz force is applied to the two coils 140 facing along the Y-axis direction.
  • the position where the Lorentz force is generated is shifted along the Y-axis direction.
  • the Lorentz force generated in the coil 140 acts on the coil 140 as a rotational force having the axis along the X-axis direction as the rotation axis. become.
  • the coil 140 rotates using the axis along the X-axis direction as a rotation axis.
  • the second base 110-2 also rotates about the axis along the X-axis direction as the rotation axis.
  • vibration propagates to the second base 110-2 due to the rotation of the coil 140 whose axis is the axis along the X-axis direction. Due to this vibration, the second base 110-2 is deformed and oscillated along the X-axis direction as in the second embodiment. As a result, the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • control current supplied to the coil 140 includes a Y-axis drive control current
  • a magnetic field is not applied to the two sides of the coil 140 facing in the X-axis direction.
  • the Lorentz force corresponding to the Y-axis drive control current is slightly generated in the coil 140.
  • the second base 110-2 is deformed and oscillated along the X-axis direction as in the second embodiment.
  • the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • the position where the Lorentz force is generated on the other side of the two sides is shifted along the X-axis direction.
  • the Lorentz force generated in the coil 140 (particularly, the Lorentz force mainly according to the Y-axis drive control current) is substantially converted into the coil as a rotational force having the axis along the Y-axis direction as the rotation axis. 140 may be acted upon.
  • the coil 140 rotates with the axis along the Y-axis direction as the rotation axis, as in the second embodiment.
  • the second base 110-2 is deformed and oscillated along the X-axis direction as in the second embodiment.
  • the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • the MEMS scanner 103 according to the third embodiment can preferably enjoy various effects that the MEMS scanner 102 according to the second embodiment enjoys.
  • the MEMS scanner 103 according to the third embodiment does not need to include the magnets 151 and 152 as compared with the MEMS scanner 102 according to the second embodiment. For this reason, further downsizing of the MEMS scanner 103 is realized.
  • FIG. 11 is a plan view conceptually showing the structure of the MEMS scanner 104 according to the fourth example.
  • the MEMS scanner 104 of the fourth embodiment is different from the MEMS scanner 103 of the third embodiment in that it further includes a magnetic yoke 170.
  • the other components of the MEMS scanner 104 of the fourth embodiment may be the same as the other components of the MEMS scanner 103 of the third embodiment.
  • the magnetic yoke 170 forms a magnetic field path in which the magnetic field emitted from the magnet 161 reaches the magnet 162 while being applied to the two sides of the coil 140 facing each other along the Y-axis direction. To do. That is, the magnetic yoke 170 has a shape extending from one end portion where the magnetic field emitted from the magnet 161 is incident toward the other end portion where the magnetic field incident on the magnet 162 is emitted.
  • FIG. 11 shows an example in which the magnetic yoke 170 has a shape extending along the X-axis direction.
  • FIG. 12 is a plan view and a cross-sectional view conceptually showing a mode of operation by the MEMS scanner 104 according to the fourth embodiment.
  • a control current (that is, an X-axis drive control current and a Y-axis drive control current) is supplied to the coil 140. Is supplied).
  • a magnetic field is applied to the coil 140 from the magnets 161 and 162.
  • the magnetic field applied from the magnets 161 and 162 is not only used for rotating the mirror 130 about the axis along the Y-axis direction but also the axis along the X-axis direction. Is also used to rotate the second base 110-2 about the rotation axis.
  • the position where the magnet 161 is disposed and the position where the magnet 162 is disposed are offset along the X-axis direction. Since the magnetic yoke 170 extending along the X-axis direction is disposed, the magnets 161 and 162 are arranged so that one of the two sides of the coil 140 facing along the Y-axis direction (for example, Relative to the side portion of one side (for example, the left side of FIG. 12 (a)) and the other side (for example, the upper side of FIG. 12 (a)) relative to the lower side of FIG. 12 (a).
  • a magnetic field is applied to the side portion on the other side (for example, the right side in FIG. 12A). That is, the magnets 161 and 162 are part of the two sides of the coil 140 facing each other along the Y-axis direction and are facing along the diagonal direction (that is, the diagonal direction) of the coil 140.
  • a magnetic field is applied to the two side portions.
  • the magnet 161 and one end of the magnetic yoke 170 face each other along the diagonal direction of the coil 140. It arrange
  • the magnet 162 and the other end of the magnetic yoke 170 are the two side portions of the coil 140 that face each other along the diagonal direction of the coil 140. It arrange
  • FIGS. 12A and 12B a control current flowing in the clockwise direction in FIG. 12A is supplied to the coil 140, and the magnet 161 moves the magnetic yoke 170.
  • FIGS. 12 (a) and 12 (b) one of the two sides of the coil 140 facing along the Y-axis direction (for example, the upper side of FIG. 12 (a)).
  • a Lorentz force is generated from the back side of the sheet of FIG. 12A toward the front side of the sheet (in other words, the upper side of FIG. 12B).
  • the Lorentz force is relatively outside of one of the two sides of the coil 140 facing in the Y-axis direction (that is, relative to the mirror 130). Will occur on the far side).
  • the other side of the two sides of the coil 140 facing along the Y-axis direction for example, the lower side of FIG. 12A
  • the Lorentz force is generated from the front side of FIG. 12A toward the back side of the paper surface (in other words, the lower side of FIG. 12B).
  • this Lorentz force is relatively inward of the other side of the two sides of the coil 140 facing along the Y-axis direction (that is, relative to the mirror 130). Will occur on the near side). Even when the direction (that is, polarity) of the control current supplied to the coil 140 is reversed, the same Lorentz force (however, the direction is reversed) is generated.
  • the position where the Lorentz force is generated is shifted along the Y-axis direction.
  • the Lorentz force generated in the coil 140 acts on the coil 140 as a rotational force having the axis along the X-axis direction as the rotation axis. become.
  • the coil 140 rotates using the axis along the X-axis direction as a rotation axis.
  • the second base 110-2 also rotates about the axis along the X-axis direction as the rotation axis.
  • vibration propagates to the second base 110-2 due to the rotation of the coil 140 whose axis is the axis along the X-axis direction. Due to this vibration, the second base 110-2 deforms and vibrates along the X-axis direction as in the third embodiment. As a result, the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • control current supplied to the coil 140 includes a Y-axis drive control current
  • a magnetic field is not applied to the two sides of the coil 140 facing in the X-axis direction.
  • the Lorentz force corresponding to the Y-axis drive control current is slightly generated in the coil 140.
  • the second base 110-2 undergoes deformation vibration along the X-axis direction, as in the third embodiment.
  • the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • the position where the Lorentz force is generated on one of the two sides of the coil 140 facing along the Y-axis direction and the coil facing along the Y-axis direction is shifted along the X-axis direction.
  • the Lorentz force generated in the coil 140 (particularly, the Lorentz force mainly according to the Y-axis drive control current) is substantially converted into the coil as a rotational force having the axis along the Y-axis direction as the rotation axis. 140 may be acted upon.
  • the coil 140 rotates with the axis along the Y-axis direction as the rotation axis, as in the second embodiment.
  • the second base 110-2 undergoes deformation vibration along the X-axis direction, as in the third embodiment.
  • the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • the MEMS scanner 104 of the fourth embodiment can suitably enjoy various effects that the MEMS scanner 102 of the second embodiment enjoys.
  • the MEMS scanner 104 according to the fourth embodiment does not need to include the magnets 151 and 152 as compared with the MEMS scanner 102 according to the second embodiment. For this reason, further downsizing of the MEMS scanner 104 is realized.
  • FIG. 13 is a plan view conceptually showing the basic structure of the MEMS scanner 105 according to the fifth example.
  • the MEMS scanner 105 of the fifth embodiment is different from the MEMS scanner 102 of the second embodiment in that the arrangement position of the coil 140 is changed and the magnet 151 and the magnet 152 are not provided. It is different in that.
  • the other components of the MEMS scanner 105 of the fifth embodiment may be the same as the other components of the MEMS scanner 102 of the second embodiment.
  • the coil 140 includes a rotation axis of the coil 140 (specifically, a rotation axis along the X-axis direction) and a rotation axis of the second base 110-2 (specifically, in the X-axis direction). Along the rotation axis) is shifted (in other words, offset) along the Y-axis direction. In other words, the coil 140 corresponds to the rotation center of the coil 140 coincident with the rotation axis of the coil 140 along the X-axis direction and the second base 110- coincident with the rotation axis of the second base 110-2 along the X-axis direction.
  • the two rotation centers are arranged so as to be shifted along the Y-axis direction.
  • the coil 140 includes the center of the coil 140 where the Lorentz force is generated (the center of the rotational force), the center of gravity of the rotating body including the coil 140 and the second base 110-2, and the first that supports the rotating body. At least two of the centers (support centers) of the torsion bars 120a-1 and 120b-1 are arranged so as to be displaced along the Y-axis direction.
  • FIG. 14 is a plan view conceptually showing an operation mode of the MEMS scanner 105 according to the fifth embodiment.
  • a control current (that is, an X-axis drive control current and a Y-axis drive control current) is supplied to the coil 140. Is supplied).
  • a magnetic field is applied to the coil 140 from the magnets 161 and 162.
  • the magnetic field applied from the magnets 161 and 162 is not only used for rotating the mirror 130 about the axis along the Y-axis direction but also the axis along the X-axis direction. Is also used to rotate the second base 110-2 about the rotation axis.
  • Magnets 161 and 162 apply a magnetic field to the two sides of coil 140 facing each other along the Y-axis direction. On the other hand, it is preferable that the magnets 161 and 162 do not apply a magnetic field to the two sides of the coil 140 facing each other along the X-axis direction. However, the magnets 161 and 162 give only the leakage flux of the magnetic field to be applied to the two sides of the coil 140 facing in the Y-axis direction to the two sides of the coil 140 facing in the X-axis direction. May be. That is, it is preferable that the magnets 161 and 162 do not positively apply a magnetic field to the two sides of the coil 140 facing each other along the X-axis direction. However, the magnets 161 and 162 may positively apply a magnetic field to the two sides of the coil 140 facing each other along the X-axis direction.
  • the control current that flows in the clockwise direction in FIG. 14 is supplied to the coil 140, and the magnetic field from the magnet 161 toward the magnet 162 is applied to the coil 140.
  • one of the two sides of the coil 140 facing in the Y-axis direction (for example, the upper side in FIG. 14) is connected to the back side of the paper in FIG. 14.
  • Lorentz force toward the front side of the page is generated.
  • the other side (for example, the lower side of FIG. 12) of the two sides of the coil 140 facing in the Y-axis direction is on the front side of the sheet of FIG. Lorentz force is generated toward the back side of the page.
  • the direction (that is, polarity) of the control current supplied to the coil 140 is reversed, the same Lorentz force (however, the direction is reversed) is generated.
  • the Lorentz force generated in the coil 140 acts on the coil 140 as a rotational moment about the axis along the X-axis direction. become. For this reason, the coil 140 rotates using the axis along the X-axis direction as a rotation axis. As a result, similarly to the second embodiment, the second base 110-2 also rotates about the axis along the X-axis direction as the rotation axis.
  • the rotational axis of the coil 140 along the X-axis direction and the rotational axis of the second base 110-2 along the X-axis direction are displaced along the Y-axis direction. ing. Due to such imbalance caused by the rotation axis deviation, the rotation of the coil 140 having the axis along the X-axis direction as the rotation axis propagates to the second base 110-2 as vibration. Due to this vibration, the second base 110-2 is deformed and oscillated along the X-axis direction as in the second embodiment. As a result, the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • the MEMS scanner 105 of the fifth embodiment can suitably enjoy various effects that the MEMS scanner 102 of the second embodiment enjoys.
  • the MEMS scanner 105 of the fifth embodiment does not need to include the magnets 151 and 152 as compared with the MEMS scanner 102 of the second embodiment. For this reason, further downsizing of the MEMS scanner 105 is realized.
  • FIG. 15 is a plan view conceptually showing the basic structure of the MEMS scanner 106 according to the sixth example.
  • the MEMS scanner 106 of the sixth embodiment is different from the MEMS scanner 102 of the second embodiment in that the magnet 151 and the magnet 152 are not provided.
  • Other configurations of the MEMS scanner 106 of the sixth embodiment may be the same as other configurations of the MEMS scanner 102 of the second embodiment.
  • FIG. 16 is a plan view conceptually showing an operation mode of the MEMS scanner 106 according to the sixth embodiment.
  • a control current (that is, an X-axis drive control current and a Y-axis drive control current) is supplied to the coil 140. Is supplied).
  • a magnetic field is applied to the coil 140 from the magnets 161 and 162.
  • the magnetic field applied from the magnets 161 and 162 is not only used for rotating the mirror 130 about the axis along the Y-axis direction but also the axis along the X-axis direction. Is also used to rotate the second base 110-2 about the rotation axis.
  • Magnets 161 and 162 apply a magnetic field to the two sides of coil 140 facing each other along the Y-axis direction. On the other hand, it is preferable that the magnets 161 and 162 do not apply a magnetic field to the two sides of the coil 140 facing each other along the X-axis direction. However, the magnets 161 and 162 give only the leakage flux of the magnetic field to be applied to the two sides of the coil 140 facing in the Y-axis direction to the two sides of the coil 140 facing in the X-axis direction. May be. That is, it is preferable that the magnets 161 and 162 do not positively apply a magnetic field to the two sides of the coil 140 facing each other along the X-axis direction.
  • the control current that flows in the clockwise direction in FIG. 16 is supplied to the coil 140, and the magnetic field from the magnet 161 toward the magnet 162 is applied to the coil 140.
  • one side (for example, the upper side in FIG. 16) of the two sides of the coil 140 facing along the Y-axis direction is formed from the back side of the paper surface in FIG. 16.
  • Lorentz force toward the front side of the page is generated.
  • the other side of the two sides of the coil 140 facing along the Y-axis direction (for example, the lower side of FIG. 16) is on the front side of the page of FIG.
  • Lorentz force is generated toward the back side of the page. Even when the direction (that is, polarity) of the control current supplied to the coil 140 is reversed, the same Lorentz force (however, the direction is reversed) is generated.
  • the Lorentz force generated in the coil 140 acts on the coil 140 as a rotational moment about the axis along the X-axis direction. become. For this reason, the coil 140 rotates using the axis along the X-axis direction as a rotation axis. As a result, similarly to the second embodiment, the second base 110-2 also rotates about the axis along the X-axis direction as the rotation axis.
  • the control current supplied to the coil 140 includes the Y-axis drive control current
  • the magnetic field is not applied to the two sides of the coil 140 facing each other along the X-axis direction.
  • a magnetic field is not applied to the two sides of the coil 140 facing each other along the X-axis direction. Even so, a Lorentz force corresponding to the Y-axis drive control current is generated on one of the two sides of the coil 140 facing in the Y-axis direction (for example, the upper side in FIG. 16). To do.
  • the second base 110-2 Due to the Lorentz force corresponding to the Y-axis drive control current, a slight vibration is generated in the coil 140 (or the second base 110-2 on which the coil 140 is disposed). As a result, the second base 110-2 is deformed and oscillated along the direction of the X-axis as in the second embodiment. As a result, the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • the two sides of the coil 140 facing along the X-axis direction are A leakage flux of a magnetic field positively applied to the two sides of the coil 140 facing each other along the Y-axis direction may be applied.
  • a slight Lorentz force corresponding to the Y-axis drive control current is generated on the two sides of the coil 140 facing each other along the X-axis direction.
  • the second base 110-2 is deformed and oscillated along the direction of the X-axis as in the second embodiment.
  • the mirror 130 rotates about the axis along the Y-axis direction as a rotation axis.
  • the rotation gain of the mirror 130 when the magnetic field is positively applied to the two sides of the coil 140 facing in the X-axis direction is 60 dB. Met.
  • the gain of rotation of the mirror 130 when the magnetic field is not actively applied to the two sides of the coil 140 facing each other along the X-axis direction was 54 dB. That is, compared with a MEMS scanner in which a magnetic field is positively applied to the two sides of the coil 140 facing each other along the X-axis direction, a magnetic field is generated on the two sides of the coil 140 facing the X-axis direction.
  • the rotation gain of the mirror 130 is reduced by about 6 dB.
  • a gain reduction of about 6 dB does not correspond to a reduction that greatly affects the operation of the MEMS scanner.
  • the MEMS scanner 106 of the sixth embodiment can suitably enjoy various effects that the MEMS scanner 102 of the second embodiment enjoys.
  • the MEMS scanner 106 according to the sixth embodiment does not need to include the magnets 151 and 152 as compared with the MEMS scanner 102 according to the second embodiment. For this reason, further downsizing of the MEMS scanner 106 is realized.
  • FIG. 17 is a plan view conceptually showing the basic structure of the MEMS scanner 107 according to the seventh example.
  • the detailed description is abbreviate
  • the MEMS scanner 107 of the seventh embodiment has characteristics of the first torsion bar 120a-1 and the characteristics of the first torsion bar 120b-1 as compared with the MEMS scanner 102 of the second embodiment. Are different in that they do not match.
  • Other configurations of the MEMS scanner 107 of the seventh embodiment may be the same as other configurations of the MEMS scanner 102 of the second embodiment.
  • the length of the first torsion bar 120a-1 is equal to the length of the first torsion bar 120a-2 (ie, the length along the X-axis direction). May be different).
  • the width of the first torsion bar 120a-1 is different from the width of the first torsion bar 120a-2 (ie, the length along the Y-axis direction). Also good.
  • the mass of the first torsion bar 120a-1 may be different from the mass of the first torsion bar 120a-2.
  • the rigidity of the first torsion bar 120a-1 may be different from the rigidity of the first torsion bar 120a-2.
  • the shape of the first torsion bar 120a-1 for example, the external shape or the cross-sectional shape
  • the shape of the first torsion bar 120a-2 for example, the external shape or the cross-sectional shape
  • the characteristics of the first torsion bars 120a-1 and 120b-1 are appropriately adjusted from the viewpoint of setting the positions of the nodes and the abdomen in the deformation vibration of the second base 110-2 to appropriate positions. Is preferred. More specifically, the characteristics of the first torsion bar 120a-1 and the first torsion bar 120b-1 are such that the portions corresponding to the rotation axes along the Y-axis direction of the coil 140 and the mirror 130 are the first. It is preferable that the two bases 110-2 be appropriately adjusted so as to be nodes in the deformation vibration.
  • the MEMS scanner 107 according to the seventh embodiment can preferably enjoy various effects that the MEMS scanner 102 according to the second embodiment enjoys.
  • the MEMS scanner 107 of the seventh embodiment does not need to match the characteristics of the first torsion bar 120a-1 and the characteristics of the first torsion bar 120b-1. This increases the degree of freedom in designing the first torsion bars 120a-1 and 120b-1. If the characteristics of the first torsion bar 120a-1 and the characteristics of the first torsion bar 120b-1 are matched, the nodes and antinodes in the deformation vibration of the second base 110-2 are set to appropriate positions. Therefore, the characteristics of the second base 110-2 are adjusted. As a result, the second base 110-2 may be increased in size.
  • the positions of the nodes and the antinodes in the deformation vibration of the second base 110-2 can be adjusted to appropriate positions. Will be set. For this reason, further downsizing of the MEMS scanner 107 is realized.
  • the present invention can be appropriately changed without departing from the gist or concept of the present invention that can be read from the claims and the entire specification, and a drive device that includes such a change is also included in the technical concept of the present invention. It is.
  • MEMS scanner 110 base 110-1 first base 110-2 second base 120a, 120b torsion bar 120a-1, 120b-1 first torsion bar 120a-2, 120b-2 second torsion bar 130 mirror 140 coil 141 Power supply terminal 151, 152, 161, 162 Magnet 170 Magnetic yoke

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
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  • Mechanical Optical Scanning Systems (AREA)
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Abstract

L'objet de la présente invention est de résoudre le problème lié aux difficultés de miniaturisation et de positionnement d'aimants à des emplacements appropriés à cause de bobines qui sont disposées de façon à entourer un miroir dans un dispositif d'entraînement, comme un scanner MEMS, dans lequel un objet entraîné, comme un miroir, est amené à tourner. Selon l'invention, ces dispositifs d'entraînement (103, 104) sont dotés : d'une seconde base (110-2) qui est entraînée en rotation autour de l'axe X par le biais de premières parties élastiques (120a-1, 120b-1) à l'intérieur d'une première base (110-1) ; et d'une partie entraînée (130) qui est entraînée en rotation autour de l'axe Y par le biais de secondes parties élastiques (120a-2, 120b-2) à l'intérieur de la seconde base. La partie entraînée est disposée à l'extérieur des enroulements d'une bobine (140) disposée sur la seconde base. De plus, des parties d'application de champ magnétique (161, 162), appliquant chacune un champ magnétique à la bobine, sont disposées de sorte qu'elles sont décalées l'une de l'autre dans la direction d'axe X ou dans la direction d'axe Y.
PCT/JP2012/062042 2012-05-10 2012-05-10 Dispositif d'entraînement WO2013168266A1 (fr)

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Cited By (18)

* Cited by examiner, † Cited by third party
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WO2018061515A1 (fr) 2016-09-29 2018-04-05 パナソニックＩｐマネジメント株式会社 Dispositif de balayage optique, dispositif de réception de lumière et système de détection optique
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EP3435137A1 (fr) 2017-07-28 2019-01-30 Panasonic Intellectual Property Management Co., Ltd. Dispositif de balayage optique comprenant des miroirs et une région de guide d'ondes optiques
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US10877215B2 (en) 2016-09-29 2020-12-29 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device that includes waveguides
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WO2018061514A1 (fr) 2016-09-29 2018-04-05 パナソニックＩｐマネジメント株式会社 Dispositif de balayage optique, dispositif de réception de lumière et système de détection optique
US11835840B2 (en) 2016-09-29 2023-12-05 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device that includes waveguides
US11256156B2 (en) 2016-09-29 2022-02-22 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device that includes waveguides
EP3869266A1 (fr) 2016-09-29 2021-08-25 Panasonic Intellectual Property Management Co., Ltd. Dispositif de balayage optique, dispositif de réception de lumière, et système de détection optique
WO2018061515A1 (fr) 2016-09-29 2018-04-05 パナソニックＩｐマネジメント株式会社 Dispositif de balayage optique, dispositif de réception de lumière et système de détection optique
US10775506B2 (en) 2017-01-31 2020-09-15 Panasonic Intellectual Property Management Co., Ltd. Imaging system
CN108415205A (zh) * 2017-02-09 2018-08-17 松下知识产权经营株式会社 光扫描设备、光接收设备以及光检测系统
US10133144B2 (en) 2017-02-09 2018-11-20 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device including waveguide array
CN108415205B (zh) * 2017-02-09 2022-11-04 松下知识产权经营株式会社 光扫描设备、光接收设备以及光检测系统
US10488498B2 (en) 2017-03-15 2019-11-26 Panasonic Intellectual Property Management Co., Ltd. Optical scanning system including optical scanning device and photoreceiver device
US10649073B2 (en) 2017-03-15 2020-05-12 Panasonic Intellectual Property Management Co., Ltd. Optical scanning system including optical scanning device and photoreceiver device
CN110366699A (zh) * 2017-04-20 2019-10-22 松下知识产权经营株式会社 光扫描设备、光接收设备及光检测系统
CN110366699B (zh) * 2017-04-20 2023-09-22 松下知识产权经营株式会社 光扫描设备、光接收设备及光检测系统
WO2018193723A1 (fr) 2017-04-20 2018-10-25 パナソニックＩｐマネジメント株式会社 Dispositif de balayage optique, dispositif de réception optique, et système de détection optique
US11644540B2 (en) 2017-04-20 2023-05-09 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device, photoreceiver device, and photodetection system
US10422990B2 (en) 2017-07-28 2019-09-24 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device that includes mirrors and optical waveguide region
US10209509B1 (en) 2017-07-28 2019-02-19 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device that includes mirrors and optical waveguide region
EP3435137A1 (fr) 2017-07-28 2019-01-30 Panasonic Intellectual Property Management Co., Ltd. Dispositif de balayage optique comprenant des miroirs et une région de guide d'ondes optiques
US11435571B2 (en) 2017-12-26 2022-09-06 Panasonic Intellectual Property Management Co., Ltd. Optical scanning device with dual spacing non-waveguide regions and dual intermediate regions adjacent a waveguide
US11126059B2 (en) 2017-12-28 2021-09-21 Panasonic Intellectual Property Management Co., Ltd. Optical device
US11256043B2 (en) 2018-03-09 2022-02-22 Panasonic Intellectual Property Management Co., Ltd. Optical device and photodetection system
US12013491B2 (en) 2018-03-27 2024-06-18 Panasonic Intellectual Property Management Co., Ltd. Optical device and photodetection system
US11619858B2 (en) 2018-09-19 2023-04-04 Panasonic Intellectual Property Management Co., Ltd. Optical device and optical detection system
US11867991B2 (en) 2018-10-23 2024-01-09 Panasonic Intellectual Property Management Co., Ltd. Photodetection system
US11480818B2 (en) 2018-10-23 2022-10-25 Panasonic Intellectual Property Management Co., Ltd. Photodetection system
US12204187B2 (en) 2018-10-23 2025-01-21 Panasonic Intellectual Property Management Co., Ltd. Photodetection system
WO2020217645A1 (fr) 2019-04-25 2020-10-29 パナソニックＩｐマネジメント株式会社 Dispositif optique, système de détection optique et procédé de fabrication
US11977314B2 (en) 2019-04-25 2024-05-07 Panasonic Intellectual Property Management Co., Ltd. Optical device, photodetection system, and method for manufacturing the same
US11953726B2 (en) 2019-04-26 2024-04-09 Panasonic Intellectual Property Management Co., Ltd. Optical device
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