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WO2018173669A1 - Dispositif de commutation de dispositif de type clavier - Google Patents

Dispositif de commutation de dispositif de type clavier Download PDF

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Publication number
WO2018173669A1
WO2018173669A1 PCT/JP2018/007576 JP2018007576W WO2018173669A1 WO 2018173669 A1 WO2018173669 A1 WO 2018173669A1 JP 2018007576 W JP2018007576 W JP 2018007576W WO 2018173669 A1 WO2018173669 A1 WO 2018173669A1
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WO
WIPO (PCT)
Prior art keywords
key
keyboard
hammer
actuator
upper electrode
Prior art date
Application number
PCT/JP2018/007576
Other languages
English (en)
Japanese (ja)
Inventor
美智子 田之上
Original Assignee
ヤマハ株式会社
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 ヤマハ株式会社 filed Critical ヤマハ株式会社
Publication of WO2018173669A1 publication Critical patent/WO2018173669A1/fr

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  • the present invention relates to a keyboard device switching device and a keyboard device.
  • a predetermined feeling (hereinafter referred to as touch feeling) is given to a player's finger through a key by the action of an action mechanism.
  • an action mechanism is required for key pressing with a hammer.
  • an electronic keyboard instrument a key depression is detected by a sensor, so that sound generation is possible without having an action mechanism such as an acoustic piano.
  • the touch feeling of an electronic keyboard instrument that does not use an action mechanism and an electronic keyboard instrument that uses a simple action mechanism are greatly different from the touch feeling of an acoustic piano. Therefore, a technique for providing a mechanism corresponding to a hammer in an acoustic piano in order to obtain a touch feeling close to that of an acoustic piano in an electronic keyboard instrument has been disclosed (for example, Patent Document 1).
  • the hammer moves in accordance with the player's key press operation, and a sound is emitted when the sensor is pressed.
  • a force is always applied to the key in the vertical direction, but the force is not always applied only in the vertical direction, such as when the key is strongly pressed. Or a force may be applied by shifting in the front-rear direction).
  • the sensor does not operate stably, and there is a possibility that sound generation failure may occur.
  • the above problem may occur even when the key directly presses the sensor in a keyboard device in which the hammer does not press the sensor (or does not use the hammer), and sound generation failure tends to occur.
  • One of the objects of the present invention is to enable a stable sound to be emitted when a performer presses an electronic keyboard instrument.
  • the present invention includes an actuator having a rotation fulcrum, a contact member that rotates together with the actuator, and a substrate having a detection unit, and the rotation fulcrum is in the same vertical position as the upper surface of the substrate. And at least one of the positions below the upper surface of the base material, and provided outside the end of the base material.
  • the contact member includes a conductive portion and a support member that supports the conductive portion. There is provided a keyboard device switching device in which the conductive portion abuts against the detection portion when rotated.
  • the contact member may be provided in at least a part of the rotation range of the actuator, and may be rotated together with the actuator by being pushed by the actuator.
  • the support member may be deformed and restored in accordance with the rotation of the actuator.
  • the contact member may be connected to an actuator.
  • a keyboard device that includes the keyboard device switching device and a key, and the actuator has a rotation range larger than the rotation range of the key.
  • the actuator may be a part of a hammer.
  • FIG. 1st Embodiment It is a figure which shows the structure of the keyboard apparatus in 1st Embodiment. It is a block diagram which shows the structure of the sound source device in 1st Embodiment. It is explanatory drawing at the time of seeing the structure inside the housing
  • FIG. 1 is a diagram illustrating a configuration of a keyboard device according to the first embodiment.
  • the keyboard device 1 is an electronic keyboard instrument that emits sound in response to a user (player) key depression such as an electronic piano.
  • the keyboard device 1 may be a keyboard-type controller that outputs control data (for example, MIDI) for controlling an external sound source device in response to a key depression.
  • the keyboard device 1 may not include the sound source device.
  • the keyboard device 1 includes a keyboard assembly 10.
  • the keyboard assembly 10 includes a white key 100w and a black key 100b.
  • a plurality of white keys 100w and black keys 100b are arranged side by side.
  • the number of keys 100 is N, which is 88 in this example.
  • This arranged direction is referred to as a scale direction (or may be referred to as D2 direction).
  • the key 100 may be referred to.
  • the configuration corresponds to the white key.
  • the longitudinal direction of the key 100 may be referred to as the D1 direction.
  • a part of the keyboard assembly 10 exists inside the housing 90.
  • a portion of the keyboard assembly 10 covered by the casing 90 is referred to as a non-appearance portion NV, and a portion exposed from the casing 90 and visible to the user is referred to as an appearance portion PV.
  • the appearance part PV is a part of the key 100 and indicates an area where the user can perform a performance operation.
  • a portion of the key 100 that is exposed by the appearance portion PV may be referred to as a key body portion.
  • a sound source device 70 and a speaker 80 are arranged inside the housing 90.
  • the tone generator 70 generates a sound waveform signal when the key 100 is pressed.
  • the speaker 80 outputs the sound waveform signal generated in the sound source device 70 to an external space.
  • the keyboard device 1 may be provided with a slider for controlling the volume, a switch for switching timbres, a display for displaying various information, and the like.
  • directions such as up, down, left, right, front, and back indicate directions when the keyboard device 1 is viewed from the performer when performing. Therefore, for example, the non-appearance part NV can be expressed as being located on the back side with respect to the appearance part PV. Further, the direction may be indicated with the key 100 as a reference, such as the front end side (key front side) and the rear end side (key rear side). In this case, the key front end side indicates the front side as viewed from the performer with respect to the key 100. The rear end side of the key indicates the back side viewed from the performer with respect to the key 100.
  • the black key 100b can be expressed as a portion protruding upward from the white key 100w from the front end to the rear end of the key body of the black key 100b.
  • FIG. 2 is a block diagram illustrating a configuration of the sound source device according to the first embodiment.
  • the sound source device 70 includes a signal conversion unit 710, a sound source unit 730, and an output unit 750.
  • the sensor 300 is provided corresponding to each key 100, detects a key operation, and outputs a signal corresponding to the detected content. In this example, the sensor 300 outputs a signal according to the key depression amount in three stages. The key pressing speed can be detected according to the interval of this signal.
  • the signal conversion unit 710 obtains output signals of the sensors 300 (sensors 300-1, 300-2,..., 300-88 corresponding to 88 keys 100) and corresponds to the operation state of each key 100. Generate and output an operation signal.
  • the operation signal is a MIDI signal. Therefore, the signal conversion unit 710 outputs note-on according to the key pressing operation. At this time, the key number indicating which of the 88 keys 100 has been operated and the velocity corresponding to the key pressing speed are also output in association with the note-on.
  • the signal conversion unit 710 outputs the key number and note-off in association with each other.
  • a signal corresponding to another operation such as a pedal may be input to the signal conversion unit 710 and reflected in the operation signal.
  • the sound source unit 730 generates a sound waveform signal based on the operation signal output from the signal conversion unit 710.
  • the output unit 750 outputs the sound waveform signal generated by the sound source unit 730. This sound waveform signal is output to, for example, the speaker 80 or the sound waveform signal output terminal.
  • the configuration of the keyboard assembly 10 will be described below.
  • FIG. 3 is an explanatory diagram when the configuration inside the housing in the first embodiment is viewed from the side of the keyboard.
  • the keyboard assembly 10 and the speaker 80 are arranged inside the housing 90. That is, the housing 90 covers at least a part of the keyboard assembly 10 (the connection portion 180 and the frame 500) and the speaker 80.
  • the speaker 80 is disposed on the back side of the keyboard assembly 10.
  • the speaker 80 is arranged so as to output a sound corresponding to the key depression toward the upper side and the lower side of the housing 90. The sound output downward advances from the lower surface side of the housing 90 to the outside.
  • the sound output upward passes through the space inside the keyboard assembly 10 from the inside of the housing 90, and is externally transmitted from the gap between the adjacent keys 100 in the exterior portion PV or the gap between the key 100 and the housing 90.
  • the path of sound from the speaker 80 that reaches the space inside the keyboard assembly 10, that is, the space below the key 100 (key body portion) is exemplified as the path SR.
  • the keyboard assembly 10 includes a connection unit 180, a hammer assembly 200, and a frame 500 in addition to the key 100 described above.
  • the keyboard assembly 10 is a resin-made structure whose most configuration is manufactured by injection molding or the like.
  • the frame 500 is fixed to the housing 90.
  • the connection unit 180 connects the key 100 so as to be rotatable with respect to the frame 500.
  • the connecting portion 180 includes a plate-like flexible member 181, a key-side support portion 183, and a rod-like flexible member 185.
  • the plate-like flexible member 181 extends from the rear end of the key 100.
  • the key side support portion 183 extends from the rear end of the plate-like flexible member 181.
  • a rod-shaped flexible member 185 is supported by the key side support portion 183 and the frame side support portion 585 of the frame 500. That is, a rod-shaped flexible member 185 is disposed between the key 100 and the frame 500. The key 100 can be rotated with respect to the frame 500 by bending the rod-shaped flexible member 185.
  • the rod-shaped flexible member 185 is configured to be attachable to and detachable from the key side support portion 183 and the frame side support portion 585.
  • the rod-like flexible member 185 may be configured so as not to be attached or detached integrally with the key side support portion 183 and the frame side support portion 585, or by bonding or the like.
  • the key 100 includes a front end key guide 151 and a side key guide 153.
  • the front end key guide 151 is slidably in contact with the front end frame guide 511 of the frame 500.
  • the front end key guide 151 is in contact with the front end frame guide 511 on both sides of the upper and lower scale directions.
  • the side key guide 153 is slidably in contact with the side frame guide 513 on both sides in the scale direction.
  • the side key guide 153 is disposed in a region corresponding to the non-appearance portion NV on the side surface of the key 100, and exists on the key front end side with respect to the connection portion 180 (plate-like flexible member 181). You may arrange
  • the key 100 is connected to the key side load unit 120 below the appearance unit PV.
  • the key-side load portion 120 is connected to the hammer assembly 200 so that the hammer assembly 200 is rotated when the key 100 is rotated.
  • the hammer assembly 200 is disposed in a space below the key 100 and is rotatably attached to the frame 500.
  • the hammer assembly 200 has a length in the front-rear direction of the key (direction D1 shown in FIG. 3).
  • the hammer assembly 200 includes a weight part 230 and a hammer body part 250.
  • the hammer main body 250 is provided with a shaft support portion 220 that serves as a bearing for the rotation shaft 520 of the frame 500.
  • the shaft support portion 220 and the rotation shaft 520 of the frame 500 abut against each other at least at three points.
  • the rotation fulcrum 521 is provided at the center of the rotation shaft 520.
  • the hammer side load portion 210 is connected to the front end portion of the hammer main body portion 250.
  • the hammer side load portion 210 includes a portion that is slidable and abuts substantially in the front-rear direction inside the key side load portion 120.
  • a lubricant such as grease may be disposed on the contact portion.
  • the hammer side load unit 210 and the key side load unit 120 (in the following description, these may be collectively referred to as “load generation unit”) generate a part of the load when the key is pressed by sliding on each other. To do.
  • the load generating unit is located below the key 100 in the appearance portion PV (frontward from the rear end of the key body).
  • the weight portion 230 includes a metal weight, and is connected to the rear end portion of the hammer main body portion 250 (the back side from the rotation shaft). In a normal state (when no key is pressed), the weight portion 230 is placed on the lower stopper 410. As a result, the key 100 is stabilized at the rest position. When the key is depressed, the weight portion 230 moves upward and collides with the upper stopper 430. This defines the end position that is the maximum key depression amount of the key 100. The weight 230 also applies a load to the key press.
  • the lower stopper 410 and the upper stopper 430 are formed of a buffer material or the like (nonwoven fabric, elastic body, etc.).
  • the sensor 300 is attached to the frame 500 below the load generating unit. When the sensor 300 is crushed on the contact surface 215 side of the hammer side load portion 210 by the key depression, the sensor 300 outputs a detection signal.
  • the hammer side load unit 210, the key side load unit 120, and the sensor 300 are collectively referred to as a keyboard device switching device 50. The configuration of the keyboard device switching device 50 will be described in detail below.
  • FIG. 4 shows a cross-sectional view of the keyboard device switching device 50 shown in FIG.
  • the sensor 300 includes an upper electrode 310, a lower electrode 320, an upper electrode support portion 330, a deformation portion 340, and a lower electrode support portion 350.
  • the upper electrode 310 is provided on the lower surface 330B of the upper electrode support 330.
  • the upper electrode 310 is formed of an elastic body.
  • a conductive portion 310 ⁇ / b> A is provided at the tip of the upper electrode 310.
  • molded silicon rubber is used for the upper electrode 310, and conductive carbon black is used as the conductor for the conductive portion 310A.
  • the lower electrode 320 is disposed on the upper surface side of the lower electrode support portion 350 so as to face the upper electrode 310.
  • the lower electrode 320 includes a conductor.
  • the lower electrode 320 is made of a metal material such as gold, silver, copper, or platinum, or a conductive resin such as conductive carbon black.
  • the lower electrode 320 is disposed in the rotation range of the hammer side load unit 210.
  • the lower electrode 320 includes a first lower electrode and a second lower electrode.
  • the first lower electrode is connected to the signal line.
  • the second lower electrode is connected to the GND line.
  • the deformation part 340 is disposed so as to connect the upper electrode support part 330 and the lower electrode support part 350.
  • the deformable portion 340 is connected to the end portion 331A of the upper electrode support portion 330 and the end portion 331B of the upper electrode support portion 330.
  • the deformable portion 340 may be directly fixed to the lower electrode support portion 350 or may be indirectly fixed to the lower electrode support portion 350 via another member.
  • the deforming portion 340 is directly fixed to the lower electrode support portion 350 by the connecting portion 340A and the connecting portion 340B.
  • the connection portion 340 ⁇ / b> A is disposed outside and below the end portion 331 ⁇ / b> A of the upper electrode support portion 330.
  • the connecting portion 340B is disposed outside and below the end portion 331B of the upper electrode support portion 330.
  • transformation part 340 has an elastic force.
  • transformation part 340 can deform
  • the deforming portion 340 is deformed, the upper electrode 310 and the upper electrode support portion 330 can move in the vertical direction. For this reason, the distance between the upper electrode 310 and the lower electrode 320 is variable.
  • molded silicon rubber is used for the deformable portion 340.
  • the upper electrode support portion 330 is disposed to face the hammer side load portion 210.
  • the upper surface 330A of the upper electrode support part 330 has a flat surface.
  • the upper surface 330 ⁇ / b> A may have a recess depending on the shape of the upper electrode 310.
  • the upper electrode support 330 is made of silicon rubber so that it can be integrally formed with the upper electrode 310 and the deformable portion 340.
  • the upper electrode 310 excluding the conductive portion 310A and the upper electrode support portion 330 may be collectively referred to as a support member. In the above, the conductive portion and the support member are collectively referred to as a contact member.
  • the upper electrode support part 330 is used as the upper surface part of the support member.
  • transformation part 340 may be called the 2nd support member which supports the said contact member.
  • the upper electrode support 330 may be provided with a lubricant as appropriate.
  • the lower electrode support part 350 is provided as another member together with the lower electrode 320.
  • the lower electrode support part 350 may be provided as a printed board, and the lower electrode 320 may be an electrode formed on the printed board.
  • the lower electrode support part 350 may be referred to as a base material.
  • the lower electrode 320 may be referred to as a detection unit.
  • the lower electrode 320 and the lower electrode support part 350 can be collectively referred to as a circuit board 360.
  • the hammer side load portion 210 has a contact surface 215 that comes into contact with the upper electrode support portion 330.
  • the contact surface 215 is provided with a plurality of convex portions 270, but is not necessarily provided.
  • the convex portion 270 may have a roundness at the tip portion 270A.
  • a material harder than the upper electrode support portion 330 is used for the hammer side load portion 210 including the contact surface 215.
  • a resin material such as plastic is used for the hammer side load portion 210.
  • the contact surface 215 may be provided with a lubricant.
  • FIG. 5 is a cross-sectional view of the keyboard device switching device 50 of FIG. 3 when viewed from the side of the keyboard (scale direction of the keyboard, direction D2 of FIG. 4).
  • the upper electrode support portion 330 of the sensor 300 is disposed so as to be inclined with respect to the lower electrode support portion 350 in accordance with the trajectory R1 around which the hammer body portion 250 including the hammer side load portion 210 rotates. ing.
  • three upper electrodes 310 are arranged, but the number is not limited to this.
  • a lower electrode 320 is arranged in accordance with the upper electrode 310.
  • the three upper electrodes 310 have different distances to the lower electrode 320, respectively.
  • a detection signal is output.
  • the rotation fulcrum 521 provided on the rotation shaft 520 is provided below the upper surface 350A of the lower electrode support 350. Further, the rotation fulcrum 521 is provided outside the end portion 350 ⁇ / b> B of the lower electrode support portion 350.
  • the rotation fulcrum 521 is not limited to the lower side of the upper surface 350A of the lower electrode support 350, and may be provided at the same vertical position as the upper surface 350A of the lower electrode support 350.
  • FIG. 6 is a diagram for explaining the operation of the key assembly when the key (white key) is pressed.
  • FIG. 6A is a diagram when the key 100 is in the rest position (a state where the key is not pressed).
  • FIG. 6B is a diagram when the key 100 is in the end position (a state where the key is pressed to the end).
  • the rod-like flexible member 185 is bent with the center of rotation.
  • the rod-shaped flexible member 185 is bent and deformed forward (frontward) of the key 100, but the key 100 moves forward due to the restriction of movement in the front-rear direction by the side key guide 153. Instead, it rotates in the normal direction (D3 direction).
  • the hammer side load part 210 has a rotation range larger than the rotation range of the key.
  • the large rotation range here refers to the amount of change in the rotation angle when a key is pressed.
  • the hammer side load part 210 functions as one of the actuators.
  • FIG. 12 and 13 are cross-sectional views of the conventional switching device 55 as viewed from the key side direction (scale direction).
  • the rotation fulcrum 525 is disposed above the upper surface 350 ⁇ / b> A of the lower electrode support part 350. As shown in FIG.
  • FIG. 7 and 8 are cross-sectional views of the keyboard device switching device 50 as viewed from the side of the key when the key 100 is pressed when the present embodiment is used.
  • an upper electrode support portion 330 that is a part of the contact member is provided in the rotation range of the hammer side load portion 210.
  • the contact surface 215 of the hammer-side load portion 210 (specifically, the tip portion 270A of the convex portion 270) abuts on the upper surface 330A of the upper electrode support portion 330.
  • the rotation fulcrum 521 is included in the expanded surface 333. Further, in this embodiment, as shown in FIGS.
  • the rotation fulcrum 521 is a surface including the contact surface 215 of the hammer side load portion 210, more precisely, a plurality of tip portions 270 ⁇ / b> A of the convex portion 270. (In the state of FIG. 7, it corresponds to the expanded surface 333).
  • the support members (the upper electrode support portion 330 and the upper electrode 310) rotate together with the hammer side load portion 210 by being pushed by the hammer side load portion 210.
  • the upper electrode 310 and the lower electrode 320 arrange
  • the conductive portion 310 ⁇ / b> A of the upper electrode 310 first contacts the lower electrode 320.
  • a support member contacts the hammer side load part 210, when rotating with the hammer side load part 210 always, it may rotate together temporarily.
  • the rotation fulcrum 521 has the same vertical position as the upper surface of the base material (that is, the upper surface 350A of the lower electrode support portion 350) and below the upper surface of the base material.
  • the rotation fulcrum 521 is provided outside the end portion 350B.
  • the switching device 50 does not have a rotating shaft in the contact member, but operates according to the operation of the key. Therefore, the switching device 50 can be pressed at a desired angle and reliably detect a signal while maintaining a more stable posture (shape) with respect to the operation of the key. Moreover, the switching apparatus 50 can detect a signal efficiently in the limited rotation range or the limited front and rear space.
  • Second Embodiment (2. Configuration of keyboard device switching device 50-1)
  • a keyboard device switching device 50-1 having a structure different from that of the first embodiment will be described.
  • the description is used.
  • FIG. 10 shows a cross-sectional view of the keyboard device switching device 50-1 as viewed from the key side direction.
  • the upper electrode 310 and the upper electrode support portion 330 are connected to the hammer side load portion 210.
  • a line 333 a connecting the conductive portions 310 A of the three upper electrodes 310 includes a rotation fulcrum 521.
  • the rotation fulcrum 521 is provided at either the same vertical position as the upper surface 350A of the lower electrode support portion 350 or a position below it. Further, the rotation fulcrum 521 is disposed outside the end 350B of the lower electrode support 350.
  • the upper electrode 310 and the upper electrode support part 330 rotate in accordance with the rotation of the hammer side load part 210.
  • the lower electrode 320 is disposed in the rotation range of the hammer side load portion 210. Therefore, as the key 100 is pressed, the hammer side load portion 210 rotates, and the conductive portion 310A of the upper electrode 310 first comes into contact with the lower electrode 320 as shown in FIG. With the above-described configuration, the conductive portion 310A (that is, the switching portion) of the upper electrode 310 can surely come into contact with the lower electrode 320 (that is, the detection portion). That is, the detection signal is reliably transmitted, and the keyboard device 1 can stably emit a sound.
  • the present invention is also applicable to a case where the upper load supporting portion 210 is further rotated and twisted when it is displaced in an oblique direction.
  • the rotation fulcrum 521 is disposed at either the same vertical position as the upper surface 350 ⁇ / b> A of the lower electrode support portion 350 or a position below it, and the end of the lower electrode support portion 350.
  • positioned on the outer side of the part 350B was shown, it is not limited to this.
  • the rotation fulcrum 521 may be disposed only at the same vertical position as the upper surface 350 ⁇ / b> A of the lower electrode support part 350 and the position below the upper support 350 ⁇ / b> A. It may be arranged only outside the end portion 350B.
  • the key side load portion 120 may be in direct contact with the upper electrode support portion 330 and pressed.
  • the arrangement of the sensor 300 is different from the position shown in FIG. 3, and the sensor 300 is located directly below the key 100 (for example, the middle position of the line connecting the front end key guide 151 and the side key guide 153 in FIG. 3). It may be arranged.
  • the key 100 is connected to the hammer assembly 200 at a location different from the position shown in FIG.
  • the upper electrode support portion 330 is more likely to be displaced in the longitudinal direction (front-rear direction). Therefore, the effect by using this invention can be acquired further.
  • the hammer assembly 200 does not need to be provided.
  • the hammer side load part 210 or the key side load part 120 may not press the upper electrode support part 330.
  • another member separated from the hammer side load unit 210 and the key side load unit 120 may function as the actuator.
  • the actuator may be a movable part that interlocks with the key.

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Abstract

La présente invention concerne un dispositif de commutation de dispositif de type clavier qui permet de produire un son stable lorsqu'un joueur appuie sur des touches d'un instrument de musique à clavier électronique. Le dispositif de commutation de dispositif de type clavier est caractérisé en ce qu'il comprend : un actionneur qui comprend un pivot de rotation ; un élément de contact qui tourne avec l'actionneur ; et un substrat qui comprend une partie de détection. Le dispositif de commutation de dispositif de type clavier est également caractérisé en ce que : le pivot de rotation est disposé en dehors d'une partie d'extrémité du substrat et à la même hauteur ou plus bas qu'une surface supérieure du substrat ; l'élément de contact a une partie conductrice et un élément de support qui supporte la partie conductrice ; et la partie conductrice est en contact avec la partie de détection lorsque l'actionneur effectue une rotation.
PCT/JP2018/007576 2017-03-24 2018-02-28 Dispositif de commutation de dispositif de type clavier WO2018173669A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-060097 2017-03-24
JP2017060097A JP2018163254A (ja) 2017-03-24 2017-03-24 鍵盤装置用スイッチング装置および鍵盤装置

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US16/570,427 Continuation US10917665B2 (en) 2017-03-15 2019-09-13 Server device, and storage medium used in same

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WO2018173669A1 true WO2018173669A1 (fr) 2018-09-27

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11212571A (ja) * 1998-01-28 1999-08-06 Yamaha Corp 鍵盤装置の駆動部構造
JP2011253040A (ja) * 2010-06-02 2011-12-15 Casio Comput Co Ltd 電子鍵盤楽器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11212571A (ja) * 1998-01-28 1999-08-06 Yamaha Corp 鍵盤装置の駆動部構造
JP2011253040A (ja) * 2010-06-02 2011-12-15 Casio Comput Co Ltd 電子鍵盤楽器

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