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WO2018193755A1 - Dispositif d'éclairage planaire - Google Patents

Dispositif d'éclairage planaire Download PDF

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Publication number
WO2018193755A1
WO2018193755A1 PCT/JP2018/009794 JP2018009794W WO2018193755A1 WO 2018193755 A1 WO2018193755 A1 WO 2018193755A1 JP 2018009794 W JP2018009794 W JP 2018009794W WO 2018193755 A1 WO2018193755 A1 WO 2018193755A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
region
light guide
prism
guide plate
Prior art date
Application number
PCT/JP2018/009794
Other languages
English (en)
Japanese (ja)
Inventor
山田　敦
健太 大石
Original Assignee
ミネベアミツミ株式会社
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
Priority claimed from JP2017140760A external-priority patent/JP2018181822A/ja
Application filed by ミネベアミツミ株式会社 filed Critical ミネベアミツミ株式会社
Priority to US16/605,037 priority Critical patent/US20210103086A1/en
Publication of WO2018193755A1 publication Critical patent/WO2018193755A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/60—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects
    • B60Q3/62—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects using light guides
    • B60Q3/64—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects using light guides for a single lighting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/70—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose
    • B60Q3/74—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps
    • B60Q3/745—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps using lighting panels or mats, e.g. electro-luminescent panels, LED mats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction

Definitions

  • the present invention relates to a planar illumination device.
  • planar lighting device for in-vehicle lighting that illuminates a driver's seat or a passenger seat in an automobile has been provided.
  • a planar illumination device that further has translucency and is visible through such a planar illumination device has been recently demanded.
  • This invention is made
  • a planar illumination device includes a light source and a light guide plate.
  • the light source emits light in a predetermined direction.
  • the light guide plate has a side surface, an emission surface that is one main surface, and a back surface that is the other main surface, a prism is formed on the back surface, and light incident on the side surface from the light source is The light exits from the exit surface.
  • the prism includes a first region that is substantially parallel to the emission surface and a second region that is inclined with respect to the emission surface when the prism is cut parallel to the predetermined direction. The region and the second region extend obliquely with respect to the predetermined direction.
  • FIG. 1A is a front view of the planar illumination device according to the embodiment. 1B is a cross-sectional view taken along line AA in FIG. 1A.
  • FIG. 2A is an enlarged view of a region D in FIG. 1A.
  • FIG. 2B is an enlarged view of region E in FIG. 1A.
  • 2C is a cross-sectional view taken along line FF in FIG. 2A.
  • FIG. 3A is a diagram for explaining the light bar according to the embodiment.
  • FIG. 3B is an enlarged view of the light bar according to the embodiment.
  • FIG. 3C is an enlarged view of region H in FIG. 3A.
  • FIG. 3D is an enlarged view of region J in FIG. 3A.
  • 3E is a cross-sectional view taken along line KK in FIG.
  • FIG. 4A is an enlarged view of a central portion in the longitudinal direction of the prism sheet according to the embodiment.
  • FIG. 4B is an enlarged view of the vicinity of the end in the longitudinal direction of the prism sheet according to the embodiment.
  • FIG. 5A is a view for explaining the visual field control film according to the embodiment.
  • FIG. 5B is a diagram for describing another example of the visual field control film according to the embodiment.
  • FIG. 6A is a front view of the planar illumination device according to the first modification of the embodiment.
  • FIG. 6B is an enlarged view of region M in FIG. 6A.
  • FIG. 7A is an enlarged view of a first light guide unit according to Modification 2 of the embodiment.
  • FIG. 7B is an enlarged view of the second light guide unit according to the second modification of the embodiment.
  • FIG. 8 is a cross-sectional view of a planar illumination device according to Modification 3 of the embodiment.
  • FIG. 9 is a diagram for explaining a visual field control film according to Modification 3 of the embodiment.
  • FIG. 10A is a diagram for explaining light distribution in the planar illumination device of the reference example.
  • FIG. 10B is a diagram for describing light distribution in the planar illumination device according to the modification 3 of the embodiment.
  • FIG. 11 is a cross-sectional view of a planar illumination device according to Modification 4 of the embodiment.
  • FIG. 12 is a diagram illustrating a light distribution in the planar lighting device of the reference example.
  • FIG. 13 is a diagram for explaining the azimuth angle in the light distribution shown in FIG.
  • FIG. 14 is a diagram for explaining polar angles in the light distribution shown in FIG.
  • FIG. 15 is a diagram illustrating a cross section of the light distribution in the embodiment, the third modification, the fourth modification, and the reference example.
  • planar lighting device according to the embodiment will be described with reference to the drawings. Note that the application of the planar lighting device is not limited by the embodiment described below. It should be noted that the drawings are schematic, and the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the actual situation. Furthermore, there are cases in which parts having different dimensional relationships and ratios are included between the drawings.
  • FIG. 1A is a front view of the planar lighting device 1 according to the embodiment
  • FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A.
  • the planar illumination device 1 includes a housing frame 2, linear light sources 3A and 3B, a visual field control film 4, and a light guide plate 5.
  • the planar illumination device 1 is used, for example, as an in-vehicle illumination lamp that illuminates the hands of a driver's seat and a passenger seat of an automobile.
  • the housing frame 2 holds and stores the linear light sources 3A and 3B, the visual field control film 4, and the light guide plate 5.
  • the housing frame 2 is made of, for example, synthetic resin or metal.
  • the housing frame 2 has an opening 2a formed on the main surface 5d side of the light guide plate 5 and an opening 2b formed on the main surface 5e side of the light guide plate 5.
  • the light guide plate 5 is exposed from the openings 2a and 2b.
  • FIG. 1A for convenience of explanation, illustration of a portion on the positive side in the Z-axis direction of the housing frame 2 at a position where the linear light sources 3A and 3B and the visual field control film 4 are disposed is omitted.
  • the linear light source 3A is, for example, a light source that emits light emitted toward the passenger seat in the vehicle (lower left side in FIG. 1A). It is a light source which emits the light radiate
  • the linear light sources 3 ⁇ / b> A and 3 ⁇ / b> B include a pair of FPC (Flexible Printed Circuits) 10, a pair of LEDs (Light Emitting Diode) 11, a pair of light bars 12, and one prism sheet 13.
  • the FPC 10 is a board on which the LEDs 11 are mounted.
  • the FPC 10 has a mounting surface configured such that the LED 11 can be mounted, and a surface opposite to the light emitting surface 11a of the LED 11 is bonded to the mounting surface.
  • a drive circuit (not shown) is connected to each of the pair of FPCs 10. Then, the LED 11 is driven by the driving circuit via the FPC 10, and the corresponding linear light sources 3A and 3B are turned on.
  • the LED 11 is a point light source.
  • the LED 11 has a light emitting surface 11 a that emits light, and is disposed on the light incident surface 12 a side of the light bar 12 in a state where the light emitting surface 11 a faces the light incident surface 12 a of the light bar 12.
  • the LED 11 emits light from the light emitting surface 11 a toward the light incident surface 12 a of the light bar 12.
  • the surface of the LED 11 opposite to the light emitting surface 11a is joined to the FPC 10. That is, the LED 11 is a top view type LED in which the mounted FPC 10 is substantially parallel to the light emitting surface 11a.
  • the LED 11 is not limited to the top view type LED, and may be a side view type LED in which the mounted FPC 10 is orthogonal to the light emitting surface 11a.
  • the light bar 12 converts light incident from the LED 11, which is a point light source, into linear light and emits it toward the prism sheet 13.
  • the light bar 12 is made of a transparent material (for example, polycarbonate resin), is formed in a rod shape, and has a light incident surface 12a, a light exit surface 12b, and a light exit surface 12c opposite to the light exit surface 12b. .
  • the light incident surface 12a is one end surface of the light bar 12, and the light emitted from the LED 11 is incident thereon.
  • the light exit surface 12b is a surface substantially perpendicular to the light entrance surface 12a and emits incident light.
  • a plurality of prisms 12j are formed side by side on the light exit surface 12b.
  • the light exit surface 12c is a surface opposite to the light exit surface 12b, and a plurality of prisms 12g (see FIG. 3C) are formed side by side. Details of the light bar 12 will be described later.
  • the prism sheet 13 controls the light distribution.
  • the prism sheet 13 is disposed between the light exit surface 12 b of the light bar 12 and the light incident surface 4 a of the visual field control film 4.
  • the prism sheet 13 has a light incident surface 13a that faces the light output surface 12b of the light bar 12, and a light output surface 13b opposite to the light incident surface 13a.
  • a plurality of prisms 13d are formed side by side on the light incident surface 13a.
  • a convex lens 13e is formed side by side on the light exit surface 13b. The details of the prism sheet 13 will be described later.
  • the linear light sources 3 ⁇ / b> A and 3 ⁇ / b> B described so far are in a predetermined direction B (Y-axis negative direction in the drawing) from the light exit surface 13 b of the prism sheet 13 to the side surface 5 c of the light guide plate 5 through the visual field control film 4.
  • a linear light is emitted.
  • planar light can be emitted from the light guide plate 5 by using the linear light sources 3A and 3B that emit light linearly.
  • the visual field control film 4 controls the light distribution angle.
  • the visual field control film 4 is disposed between the light exit surface 13 b of the prism sheet 13 and the side surface 5 c of the light guide plate 5.
  • the field-of-view control film 4 has a light incident surface 4a that faces the light output surface 13b of the prism sheet 13, and a light output surface 4b opposite to the light incident surface 4a. The details of the visual field control film 4 will be described later.
  • the light guide plate 5 is formed in a rectangular shape when viewed from above, and the first light guide portion 5a into which the light emitted from the linear light source 3A enters and the light emitted from the linear light source 3B enter. And a second light guide 5b.
  • the planar illumination device 1 according to the embodiment is formed symmetrically about a center C shown in FIG. 1A as an axis, and the light guide plate 5 and the first light guide unit 5a are connected to the first C light guide 5a with the center C as a boundary. 2 light guides 5b.
  • the light guide plate 5 has a side surface 5c facing the visual field control film 4, a main surface 5d, and a main surface 5e opposite to the main surface 5d.
  • the side surface 5c is a strip-shaped surface extending in the X-axis direction. Light traveling in a predetermined direction B is incident on the side surface 5c.
  • the light guide plate 5 when the light guide plate 5 is cut in parallel to the predetermined direction B, the light guide plate 5 has a wedge shape that gradually decreases in thickness in the predetermined direction B. That is, the distance between the main surface 5d and the main surface 5e becomes narrower as the light guide plate 5 is separated from the visual field control film 4.
  • the main surfaces 5d and 5e are rectangular surfaces extending along the XY plane.
  • the main surface 5d is an emission surface from which light incident from the side surface 5c is emitted. Therefore, in the following description, the main surface 5d is referred to as “exit surface 5d”.
  • the main surface 5e on the back side is expressed as “back surface 5e”.
  • the light guide plate 5 is made of a transparent material (for example, polycarbonate resin) and has a desired translucency.
  • the entire light guide plate 5 is transparent so that an object existing on the back surface 5 e side can be viewed from the exit surface 5 d side through the openings 2 a and 2 b of the housing frame 2.
  • the exit surface 5d is disposed substantially parallel to the predetermined direction B.
  • the back surface 5e is inclined from the predetermined direction B.
  • a plurality of prisms 5f are arranged side by side on the back surface 5e. Next, details of the prism 5f formed on the light guide plate 5 will be described with reference to FIGS. 2A to 2C.
  • FIG. 2A is an enlarged view of region D in FIG. 1A
  • FIG. 2B is an enlarged view of region E in FIG. 1A. That is, FIG. 2A is an enlarged view of the first light guide portion 5a into which light from the linear light source 3A enters, and FIG. 2B is an enlarged view of the second light guide portion 5b into which light from the linear light source 3B enters.
  • FIG. 2A is an enlarged view of the first light guide portion 5a into which light from the linear light source 3A enters
  • FIG. 2B is an enlarged view of the second light guide portion 5b into which light from the linear light source 3B enters.
  • FIG. 2C is a cross-sectional view taken along the line FF in FIG. 2A. Specifically, FIG. 2C is a cross-sectional view when the light guide plate 5 is cut in parallel with a predetermined direction B. Note that FIG. 2C also coincides with the cross section taken along line GG in FIG. 2B.
  • a plurality of prisms 5f are formed along the predetermined direction B on the back surface 5e of the light guide plate 5. As shown in FIG.
  • the prism 5f has a first region 5f1 and a second region 5f2.
  • region 5f1 is substantially planar shape, and when the light-guide plate 5 is cut
  • the second region 5f2 has a substantially planar shape, and is inclined with respect to the emission surface 5d when the light guide plate 5 is cut in parallel with the predetermined direction B. Specifically, the second region 5f2 is inclined in a direction approaching the emission surface 5d as it goes in the predetermined direction B. Also, the second region 5f2 of one prism 5f is formed continuously with the first region 5f1 of the adjacent prism 5f.
  • the prism 5f having such a cross-sectional shape changes the path of the light irradiated along the predetermined direction B by the linear light sources 3A and 3B, and emits the light from the emission surface 5d. . Specifically, light is reflected toward the exit surface 5d by the second region 5f2 of the prism 5f. Thus, the light distribution in the Z-axis direction can be controlled by the prism 5f.
  • the light guide plate 5 when the light guide plate 5 is cut in parallel with the predetermined direction B, the object existing on the back surface 5e side is visually recognized from the exit surface 5d side by making the first region 5f1 and the exit surface 5d substantially parallel.
  • the physical continuity of the visually recognized object can be increased. That is, the distortion of the visually recognized object can be reduced by making the first region 5f1 and the exit surface 5d substantially parallel. Therefore, the light guide plate 5 has high translucency.
  • the light incident along the predetermined direction B is reflected by the first region 5f1 by making the first region 5f1 substantially parallel to the emission surface 5d.
  • the first region 5f1 and the second region 5f2 of the prism 5f extend obliquely with respect to the predetermined direction B.
  • the first region 5f1 and the second region 5f2 are directed from the X-axis negative direction and the Y-axis negative direction to the X-axis positive direction and the Y-axis positive direction. It extends.
  • the first region 5f1 and the second region 5f2 extend from the X-axis positive direction and the Y-axis negative direction toward the X-axis negative direction and the Y-axis positive direction.
  • the first light guide 5a emits light in the negative X-axis direction and the negative Y-axis direction
  • the second light guide 5b The light is emitted in the positive direction of the X axis and in the negative direction of the Y axis. That is, light is emitted from the light guide plate 5 in a direction away from the visual field control film 4 and in a direction approaching both ends where the LEDs 11 are provided. In this way, the light distribution in the X-axis direction can be accurately controlled by the prism 5f.
  • the light distribution (in the orthogonal direction on the exit surface 5 d of the light guide plate 5) is achieved by the prism 5 f formed on the light guide plate 5.
  • the light distribution in the biaxial direction) can be controlled with high accuracy.
  • the light guide plate 5 has high translucency. That is, according to the embodiment, it is possible to achieve both the light transmitting property and the high light distribution property.
  • the light emitted from the light guide plate 5 may be emitted within a range of 40 ° or less in full width at half maximum.
  • the first region 5f1 and the emission surface 5d do not have to be completely parallel.
  • the first region 5f1 may have an angle of 0 ° or more and 5 ° or less with the emission surface 5d.
  • the first region 5f1 preferably has an angle of 0 ° to 1 ° with the exit surface 5d, and more preferably has an angle of 0 ° to 0.5 ° with the exit surface 5d.
  • the entire light guide plate 5 since the entire light guide plate 5 has a wedge shape in the cross-sectional view of the YZ plane, the light guide plate 5 is cut in a direction different from the predetermined direction B. In this case, the first region 5f1 and the emission surface 5d are not parallel.
  • the ratio of the length L2 of the first region 5f1 in the Y-axis direction to the length L1 of the prism 5f in the Y-axis direction is 60 % Or more and less than 100%.
  • the length L1 is the sum of the length L2 and the length L3 of the second region 5f2 in the Y-axis direction.
  • the prism angle ⁇ 1 formed by the second region 5f2 and the surface 5g parallel to the exit surface 5d is expressed by the following equation (1).
  • ⁇ 1 ⁇ 90 ⁇ asin (sin ⁇ / n) ⁇ / 2 (°) (1)
  • the angle ⁇ is an angle (emission angle) formed by the direction 5h perpendicular to the emission surface 5d and the light 100 emitted from the emission surface 5d.
  • N is the refractive index of the light guide plate 5.
  • the planar illumination device 1 when used as an in-vehicle illumination lamp that illuminates the hands of the driver seat and the passenger seat, a person sitting on the driver or passenger seat It is possible to illuminate only at hand. Thereby, it can suppress that a driver
  • a plurality of lights 100 are emitted in a plurality of directions from the emission surface 5d, and a direction 5h perpendicular to the emission surface 5d and a direction in which the light 100 having the peak luminous intensity among the plurality of lights 100 travels. Is an angle ⁇ .
  • FIG. 3A is a diagram for explaining the light bar 12 according to the embodiment.
  • the width (dimension in the Y-axis direction) of the light bar 12 decreases from one end where the light incident surface 12a is provided toward the other end along the longitudinal direction (X-axis direction in the drawing). It has become.
  • the light bar 12 has a root portion 12d including the light incident surface 12a and a tip portion 12e provided away from the light incident surface 12a.
  • the root portion 12d and the tip portion 12e are formed with different inclinations of the light exit surface 12c. Specifically, as shown in FIG. 3B, the angle ⁇ 2 formed between the light exit surface 12c1 provided at the root portion 12d and the surface 12f parallel to the light exit surface 12b is the same as the light exit surface 12c2 provided at the tip portion 12e. The angle ⁇ 3 formed with the surface 12f parallel to the light exit surface 12b is larger.
  • the light bar 12 has a two-stage wedge shape in which the reflecting surface 12c1 provided at the root portion 12d has a larger inclination than the reflecting surface 12c2 provided at the tip portion 12e.
  • FIG. 3C is an enlarged view of region H in FIG. 3A
  • FIG. 3D is an enlarged view of region J in FIG. 3A. That is, FIG. 3C is a diagram for explaining the prism 12g formed in the region H near the root portion 12d in the tip portion 12e, and FIG. 3D is separated from the root portion 12d in the tip portion 12e.
  • 5 is a diagram for explaining a prism 12g formed in a region J.
  • a plurality of prisms 12g are formed along the longitudinal direction (X-axis direction) of the light bar 12 on the light exit surface 12c in the region H.
  • the prism 12g has an inclined surface 12g1 and an inclined surface 12g2.
  • the inclined surface 12g1 is inclined in a direction away from the light exit surface 12b as it goes from one end (light entrance surface 12a side) of the light bar 12 to the other end.
  • the inclined surface 12g2 is inclined in a direction approaching the light exit surface 12b as it goes from one end (light incident surface 12a side) of the light bar 12 to the other end. Further, the inclined surface 12g2 of one prism 12g is formed continuously with the inclined surface 12g1 of the adjacent prism 12g.
  • a plurality of prisms 12g are also formed side by side along the longitudinal direction (X-axis direction) of the light bar 12 on the light exit surface 12c in the region J.
  • the angle ⁇ 4 formed by the inclined surface 12g2 of the prism 12g in the region H shown in FIG. 3C and the surface 12f parallel to the light exit surface 12b is the inclination of the prism 12g in the region J shown in FIG. 3D. It is smaller than the angle ⁇ 5 formed by the surface 12g2 and the surface 12f parallel to the light exit surface 12b. That is, as it goes from one end (light incident surface 12a side) to the other end of the light bar 12, the angle formed by the inclined surface 12g2 of the prism 12g and the surface 12f parallel to the light exit surface 12b is gradually increased. To change.
  • the angle ⁇ 6 formed by the inclined surface 12g1 and the inclined surface 12g2 is an angle common to all the prisms 12g.
  • FIG. 3E is a cross-sectional view taken along line KK in FIG. 3A.
  • FIG. 3E shows the side surfaces 12k and 12m of the light bar 12 substantially parallel to the XY plane.
  • a plurality of prisms 12j are formed side by side along the short direction (Z-axis direction) of the light bar 12 on the light exit surface 12b of the light bar 12 in a sectional view of the YZ plane.
  • the prism 12j has an inclined surface 12j1 and an inclined surface 12j2.
  • the inclined surface 12j1 is inclined in a direction away from the surface 12h parallel to the light exit surface 12b as it goes from one end (side surface 12k side) to the other end (side surface 12m side) in the short direction of the light bar 12.
  • the inclined surface 12j2 is inclined in a direction approaching the surface 12h parallel to the light exit surface 12b as it goes from one end (side surface 12k side) to the other end (side surface 12m side) in the short direction of the light bar 12.
  • the apex angle ⁇ 7 of the angle formed by the inclined surface 12j1 and the inclined surface 12j2 is 90 °, for example.
  • an angle ⁇ 8 formed by the inclined surface 12j1 and the surface 12h and an angle ⁇ 9 formed by the inclined surface 12j2 and the surface 12h are, for example, 45 °.
  • the prism 12j changes the path of the light 101 incident on the light bar 12 in a direction parallel to the Y-axis direction, thereby converting the light 101 into the light incident surface 13a of the prism sheet 13. Can be made incident.
  • the light distribution in the Z-axis direction can be accurately controlled by the prism 12j.
  • the light distribution in the X-axis direction can be controlled by forming the prism 12g on the light exit surface 12c. That is, in the light bar 12 according to the embodiment, the light distribution in the X-axis direction and the Z-axis direction can be accurately controlled.
  • the apex angle ⁇ 7 of the prism 12j is 90 °
  • the light distribution angle in the Z-axis direction on the exit surface 5d of the light guide plate 5 can be minimized.
  • the apex angle ⁇ 7 is made larger than 90 °, the light distribution in the Z-axis direction on the exit surface 5d of the light guide plate 5 can be widened.
  • FIG. 4A is an enlarged view of a central portion in the longitudinal direction (X-axis direction) of the prism sheet 13 according to the embodiment.
  • a plurality of prisms 13 d are formed side by side along the longitudinal direction (X-axis direction) of the prism sheet 13 on the light incident surface 13 a in the center of the prism sheet 13.
  • the prism 13d has an inclined surface 13d1 and an inclined surface 13d2.
  • the inclined surface 13d1 is inclined in a direction away from the light exit surface 13b as it goes from one end (X-axis negative direction side) in the longitudinal direction of the prism sheet 13 to the other end (X-axis positive direction side).
  • the inclined surface 13d2 is inclined in a direction approaching the light exit surface 13b as it goes from one end (X-axis negative direction side) in the longitudinal direction of the prism sheet 13 to the other end (X-axis positive direction side). Further, the inclined surface 13d2 of one prism 13d is formed continuously with the inclined surface 13d1 of the adjacent prism 13d.
  • the prism 13d changes the path of the light 102 incident on the prism sheet 13 in a direction parallel to the Y-axis direction, so that the light 102 is incident on the light incident surface 4a of the visual field control film 4. Can be made incident.
  • the light 102 incident on the inclined surface 13d1 of the prism 13d is reflected toward the light incident surface 4a by the inclined surface 13d2.
  • the light distribution in the X-axis direction can be controlled by the prism 13d.
  • FIG. 4B is an enlarged view of the vicinity of the end portion in the longitudinal direction of the prism sheet 13 according to the embodiment, specifically, an enlarged view of the vicinity of the end portion on the linear light source 3A side.
  • a plurality of prisms 13d are also formed side by side along the longitudinal direction (X-axis direction) of the prism sheet 13 on the light incident surface 13a in the vicinity of the end.
  • the shapes of the plurality of prisms 13 d in the cross-sectional view of the XY plane are line symmetric with respect to the line segment passing through the center C of the planar illumination device 1. That is, the light incident surface 13a is inclined toward the center C from both ends of the prism sheet 13 in the X-axis direction, and is inclined in a direction approaching the light output surface 13b and an inclined surface 13d1 inclined in a direction away from the light output surface 13b.
  • a plurality of prisms 13d having continuous inclined surfaces 13d2 are formed side by side along the X-axis direction.
  • the prism 13 d changes the path of the light 103 incident on the prism sheet 13 in a direction parallel to the Y-axis direction, thereby causing the light 103 to enter the light incident surface 4 a of the visual field control film 4. Can be made incident.
  • the angle ⁇ 10 formed by the inclined surface 13d1 of the prism 13d in the central portion of the prism sheet 13 shown in FIG. 4A and the surface 13f parallel to the light exit surface 13b is the prism sheet shown in FIG. 4B. 13 is smaller than the angle ⁇ 13 formed by the inclined surface 13d1 and the surface 13f of the prism 13d in the vicinity of the end portion.
  • the inclination angle (angle ⁇ 10) of the inclined surface 13d1 formed in the central portion of the light incident surface 13a is smaller than the inclination angle (angle ⁇ 13) of the inclined surface 13d1 formed near the end of the light incident surface 13a.
  • the angle ⁇ 11 formed by the inclined surface 13d2 of the prism 13d in the central portion of the prism sheet 13 shown in FIG. 4A and the surface 13f parallel to the light exit surface 13b is the prism sheet 13 shown in FIG. 4B. Is larger than the angle ⁇ 14 formed by the inclined surface 13d2 and the surface 13f of the prism 13d in the vicinity of the end of the prism 13d.
  • the inclination angle (angle ⁇ 11) of the inclined surface 13d2 formed at the central portion of the light incident surface 13a is larger than the inclination angle (angle ⁇ 14) of the inclined surface 13d2 formed near the end of the light incident surface 13a.
  • the angle ⁇ 12 formed by the inclined surface 13d1 and the inclined surface 13d2 is an angle common to all the prisms 13d.
  • the angle ⁇ 10 formed by the inclined surface 13d1 and the surface 13f is equal to the angle ⁇ 11 formed by the inclined surface 13d2 and the surface 13f. That is, in the cross-sectional view of the XY plane, the shape of the prism 13d located at the center C is an isosceles triangle.
  • the shape of the plurality of prisms 13d in the cross-sectional view of the XY plane is line symmetric with respect to the line segment passing through the center C of the planar illumination device 1.
  • the light exit surface 13b of the prism sheet 13 may be planar, or as shown in FIGS. 4A and 4B, a lenticular lens in which a plurality of convex lenses 13e are arranged in the X-axis direction may be provided.
  • the light distribution in the X-axis direction can be increased by increasing the contact angle between the convex lens 13e and the light exit surface 13b.
  • the light distribution in the X-axis direction can be accurately controlled by appropriately adjusting the contact angle between the convex lens 13e and the light exit surface 13b. Therefore, the light distribution in the X-axis direction on the exit surface 5d of the light guide plate 5 can be accurately controlled. Furthermore, by making the pitch interval between the adjacent convex lenses 13e narrower than the pitch interval between the prisms 13d facing each other, it is possible to improve the uniformity of luminance in the X-axis direction.
  • FIG. 5A is a view for explaining the visual field control film 4 according to the embodiment, and specifically, a cross-sectional view in the XY plane.
  • the visual field control film 4 has a light transmission part 4c as a base material and a plurality of light absorption parts 4d.
  • the light transmitting portion 4c has a function of transmitting light, and is made of, for example, a light transmitting resin.
  • the light absorbing portion 4d has a function of absorbing light and is made of, for example, a light absorbing resin.
  • the light absorbing portion 4d has a band shape, and is arranged so that the longitudinal direction thereof is aligned in a predetermined direction (for example, the peak direction P of light emitted from the prism sheet 13 in a cross-sectional view of the XY plane).
  • light 104 or light 105 having a small inclination with respect to the peak direction P can pass through the light transmitting portion 4c from the light incident surface 4a to the light exit surface 4b, whereas the peak direction
  • the light 106 having a large inclination with respect to P is absorbed by the light absorbing portion 4d and cannot reach the light exit surface 4b.
  • the light emitted from the light exit surface 4b of the visual field control film 4 that is, the light emitted from the linear light sources 3A and 3B to the light guide plate 5 has a full width at half maximum of 20 ° or less.
  • the visual field control film 4 is good to restrict
  • FIG. 5A shows the case where the peak direction P is parallel to the Y-axis direction
  • the peak direction P is not limited to being parallel to the Y-axis direction.
  • FIG. 5B when the peak direction P is tilted from the Y-axis direction, the longitudinal direction of the light absorbing portion 4d may be tilted from the Y-axis direction so as to be along the peak direction P.
  • FIG. 5B is a diagram for explaining another example of the visual field control film 4 according to the embodiment. Thereby, similarly to the example shown in FIG. 5A, it is possible to suppress the transmission of the light 106 having a large inclination with respect to the peak direction P.
  • a resin having a high reflectance for example, a white resin
  • a resin having a high reflectance for example, a white resin
  • a resin having a high absorption rate may be used for the housing frame 2 other than the above-described parts. Thereby, unnecessary light distribution can be reduced. That is, the housing frame 2 is preferably formed by two-color molding using a white resin and a black resin.
  • the planar illumination device 1 includes a surface other than the light incident surface 12a and the light output surface 12b in the light bar 12, a surface other than the light incident surface 13a and the light output surface 13b in the prism sheet 13, and the light guide plate 5.
  • the light be specularly reflected on the surface having a width of about 2 mm adjacent to the side surface 5c.
  • a specular reflection sheet having a U-shaped cross section.
  • planar illumination device 1 is configured such that light is absorbed by the terminal end portion (the lower end portion in FIG. 1A) and the side surface portion (the left and right side surfaces in FIG. 1A) of the light guide plate 5. It is good to be. For example, such a portion may be painted with a black coating material. Thereby, unnecessary light distribution can be reduced.
  • FIG. 6A is a front view of the planar lighting device 1 according to the first modification of the embodiment
  • FIG. 6B is an enlarged view of a region M in FIG. 6A.
  • Modification 1 only one linear light source is provided instead of a pair as in the embodiment (linear light source 3A).
  • the prism 5 f is inclined with respect to a predetermined direction B (in the figure, from the X axis positive direction and the Y axis negative direction to the X axis negative direction and the Y axis positive direction). Extending). Thereby, in the modification 1, light can be irradiated toward a desired one direction (X-axis positive direction and Y-axis negative direction in the drawing) by the prism 5f.
  • FIG. 7A is an enlarged view of the first light guide 5a according to Modification 2 of the embodiment
  • FIG. 7B is an enlarged view of the second light guide 5b according to Modification 2 of the embodiment
  • 7A is an enlarged view of a region D (see FIG. 1A) in the embodiment
  • FIG. 7B is an enlarged view of a region E (see FIG. 1A) in the embodiment.
  • the prism 5f extends obliquely with respect to the predetermined direction B as in the embodiment, whereas the first light guide 5b as shown in FIG. 7A.
  • the prism 5f extends in a direction perpendicular to the predetermined direction B.
  • the emission direction can be aligned with the predetermined direction B on the XY plane as shown in FIG. 7A. Furthermore, by forming the prism 5f tilted from the predetermined direction B in the second light guide 5b, it is possible to irradiate with the emission direction tilted from the predetermined direction B on the XY plane.
  • the planar illumination device 1 can change the emission direction in two different directions.
  • FIG. 8 is a cross-sectional view of the planar lighting device 1 according to the third modification of the embodiment, and corresponds to FIG. 1B in the embodiment.
  • the third modified example is an example in which the visual field control film 4 in the embodiment is changed to a visual field control film 4A having a different structure.
  • FIG. 9 is a diagram for explaining a visual field control film 4A according to Modification 3 of the embodiment, specifically, a cross-sectional view in the YZ plane.
  • the visual field control film 4 ⁇ / b> A has a light transmission part 4 c that is a base material and a plurality of light absorption parts 4 d, similarly to the visual field control film 4.
  • the light absorbing portion 4 d having a band shape is arranged so that the longitudinal direction is aligned with the peak direction P of the light emitted from the prism sheet 13 in the cross-sectional view of the YZ plane.
  • the light 107 and the light 108 having a small inclination with respect to the peak direction P can be transmitted through the light transmitting portion 4 c from the light incident surface 4 a to the light exit surface 4 b in the cross-sectional view of the YZ plane. it can.
  • the light 109 having a large inclination with respect to the peak direction P is absorbed by the light absorbing portion 4d and cannot reach the light exit surface 4b.
  • FIG. 10A is a diagram for explaining light distribution in the planar illumination device 1 of the reference example. Specifically, the reference example shown in FIG. 10A shows a planar illumination device 1 in which the visual field control film 4A is not provided.
  • the light guide plate 5 has not only the light 107 and the light 108 with a small inclination with respect to the peak direction P but also the peak direction P in the cross-sectional view of the YZ plane.
  • Light 109 having a large inclination with respect to is also incident.
  • the light 107 and the light 108 having a small inclination with respect to the peak direction P are reflected by the first region 5f1 and the second region 5f2 of the prism 5f inside the light guide plate 5, and are transmitted in a predetermined direction (Y-axis negative direction and Z-axis). The light is emitted in the positive direction.
  • the light 109 having a large inclination with respect to the peak direction P is repeatedly reflected by the light exit surface 5d and the first region 5f1 of the prism 5f inside the light guide plate 5, and finally reflected by the second region 5f2 to be predetermined. Is emitted in a direction different from the direction (Y-axis positive direction and Z-axis positive direction).
  • the field-of-view control film 4A when the field-of-view control film 4A is not provided, it is difficult to improve the light distribution in the Y-axis direction of the light that is changed in direction by the light guide plate 5 and emitted. That is, in the reference example, there is a possibility that a driver on the Y axis positive direction side or a person sitting in the passenger seat may feel dazzled.
  • FIG. 10B is a diagram for explaining light distribution in the planar illumination device 1 according to the third modification of the embodiment.
  • the visual field control film 4A when the visual field control film 4A is provided, the light 107 and the light 108 having a small inclination with respect to the peak direction P are incident on the light guide plate 5 in the cross-sectional view of the YZ plane.
  • Light 109 having a large inclination with respect to is not incident.
  • the light distribution property in the Y-axis direction of the light emitted with the direction changed by the light guide plate 5 can be improved.
  • the light emitted from the light exit surface 4b of the visual field control film 4A that is, the light emitted from the linear light sources 3A and 3B to the light guide plate 5 in the cross-sectional view of the YZ plane is 20 ° or less at a full width at half maximum. It is good to be.
  • the light distribution angle may be limited within a range of ⁇ 60 ° or less, and more preferably limited within the range of ⁇ 45 ° or less. Thereby, the light distribution in the Y-axis direction of the light emitted with the direction changed by the light guide plate 5 can be further improved.
  • FIG. 11 is a cross-sectional view of the planar illumination device 1 according to the fourth modification of the embodiment.
  • Modification 4 is an example in which both the visual field control film 4 provided in the embodiment and the visual field control film 4A provided in Modification 3 are used.
  • the visual field control film 4 and the visual field control film 4 ⁇ / b> A are laminated and disposed between the prism sheet 13 and the light guide plate 5.
  • the visual field control film 4 can improve the light distribution in the X-axis direction of the light emitted from the light guide plate 5 whose direction is changed, and the visual field control film 4A allows the light guide plate 5 to be improved. It is possible to improve the light distribution in the Y-axis direction of the light emitted with the direction changed by.
  • Modification 4 it is preferable to directly bond the visual field control film 4 and the visual field control film 4A. Thereby, since the change of the refractive index between the visual field control film 4 and the visual field control film 4A can be suppressed, the attenuation of light between the visual field control film 4 and the visual field control film 4A is suppressed. be able to. Therefore, the luminous efficiency of the planar lighting device 1 can be improved.
  • FIG. 12 is a diagram showing a light distribution in the planar lighting device 1 of the reference example. Note that the light distribution shown in FIG. 12 indicates that the darker the color, the higher the luminance. Further, the orientation of the azimuth angle and polar angle in the light distribution shown in FIG. 12 will be described with reference to FIGS.
  • FIG. 13 is a diagram for explaining the azimuth angle in the light distribution shown in FIG.
  • the X-axis positive direction is set to an azimuth angle of 0 °
  • the Y-axis negative direction is set to The azimuth angle is 90 °
  • the negative X-axis direction is 180 °
  • the positive Y-axis direction is 270 °.
  • An azimuth angle of 90 ° (Y-axis negative direction) corresponds to the front side of the vehicle
  • an azimuth angle of 270 ° (Y-axis positive direction) corresponds to the rear side of the vehicle.
  • FIG. 14 is a diagram for explaining polar angles in the light distribution shown in FIG.
  • the positive Z-axis direction is 0 ° and the vertical direction is perpendicular to the positive Z-axis direction.
  • the direction is a polar angle of 90 °
  • the opposite direction of the perpendicular direction is a polar angle of ⁇ 90 °.
  • the positive Y-axis direction is 90 ° polar angle
  • the negative Y-axis direction is ⁇ 90 ° polar angle.
  • the planar illumination device 1 of the reference example is configured to emit light in a predetermined direction centered on an azimuth angle of about 25 ° and a polar angle of about 50 °. .
  • the planar illumination device 1 of the reference example emits light in a direction different from the predetermined direction.
  • FIG. 15 is a view showing a cross section of the light distribution of the embodiment, the third modification, the fourth modification, and the reference example. Specifically, FIG. 15 is a cross section at an azimuth angle of about 337 ° (corresponding to the broken line 110 in FIG. 12) in the luminance distribution in the hemispherical direction in which the positive Z-axis direction shown in FIG. The brightness is shown.
  • the region where the polar angle is near 0 ° is a region where the luminance is increased when the light distribution is disturbed in the X-axis direction, and the region where the polar angle is near 63 ° is the light distribution in the Y-axis direction. This is a region where the brightness increases when disturbed.
  • the luminance is high regardless of whether the polar angle is near 0 ° or 63 °. It can be seen that the light distribution is somewhat disturbed both in the direction and in the Y-axis direction.
  • the light distribution is improved in the X-axis direction because the luminance is reduced near the polar angle of 0 ° as compared with the reference example. I understand.
  • the luminance is reduced near the polar angle of 63 ° as compared with the reference example, the light distribution is improved in the Y-axis direction. I understand.
  • the luminance is reduced even when the polar angle is around 0 ° or the polar angle is around 63 ° as compared with the reference example. From this, it can be seen that the light distribution in both the X-axis direction and the Y-axis direction is improved.
  • the prism 5f formed on the back surface 5e of the light guide plate 5 is cut in parallel to the predetermined direction B, the first region 5f1 substantially parallel to the emission surface 5d
  • the second region 5f2 is inclined with respect to the emission surface 5d, and the first region 5f1 and the second region 5f2 are formed so as to extend obliquely with respect to the predetermined direction B. Both light properties and high light distribution can be achieved.
  • the linear light sources 3A and 3B are formed using the LED 11 and the light bar 12, but the configuration of the linear light source is not limited to this example.
  • a linear light source may be formed by arranging a plurality of LEDs in a line.
  • the planar illumination device 1 is formed symmetrically about the center C as an axis, but may not be formed symmetrically.
  • the configuration of the prism sheet 13 is bilaterally symmetric, but the prism sheet 13 may be configured differently on the left and right. Thereby, the light of the different direction can be incident on the 1st light guide part 5a and the 2nd light guide part 5b of the light guide plate 5, respectively. Furthermore, in the above embodiment, the prism sheet 13 is integrally formed. However, like the light bar 12, the prism sheet 13 may be divided into left and right.
  • the planar illumination device 1 includes the light sources (linear light sources 3A and 3B) and the light guide plate 5.
  • the light sources (linear light sources 3A and 3B) emit light in a predetermined direction B.
  • the light guide plate 5 has a side surface 5c, an exit surface 5d that is one main surface, and a back surface 5e that is the other main surface.
  • a prism 5f is formed on the back surface 5e, and light sources (linear light sources 3A and 3B) are formed. ) Is incident on the side surface 5c from the exit surface 5d.
  • the prism 5f includes a first region 5f1 that is substantially parallel to the exit surface 5d and a second region 5f2 that is inclined with respect to the exit surface 5d when cut in parallel to the predetermined direction B.
  • the first region 5f1 and the second region 5f2 extend obliquely with respect to the predetermined direction B. Thereby, both the translucency and the high light distribution can be achieved.
  • the light emitted from the emission surface 5d is emitted in a range of 40 ° or less at the full width at half maximum.
  • planar illumination device 1 further includes a visual field control film 4 configured to be capable of limiting the light distribution angle between the light source (linear light sources 3A and 3B) and the side surface 5c of the light guide plate 5. Prepare. Thereby, the light distribution property of the light emitted by changing the direction by the light guide plate 5 can be improved.
  • the visual field control film 4 has a light distribution angle with respect to a predetermined direction of ⁇ 60 ° or less (preferably ⁇ 45) when cut by a plane parallel to the emission surface 5d. Limit in the range of ° or less. Thereby, the light distribution in the X-axis direction of the light emitted with the direction changed by the light guide plate 5 can be further improved.
  • the visual field control film 4A has a light distribution angle in a range of ⁇ 60 ° or less (preferably ⁇ 45 ° or less) when cut along a plane perpendicular to the longitudinal direction. Limit with. Thereby, the light distribution in the Y-axis direction of the light emitted with the direction changed by the light guide plate 5 can be further improved.
  • the light sources are linear light sources 3A and 3B extending along the side surface 5c. Thereby, planar light can be emitted from the light guide plate 5.
  • two linear light sources 3A and 3B are arranged along the side surface 5c. Thereby, two different places (for example, the driver's seat side and the passenger seat side) can be irradiated with light independently.
  • the light guide plate 5 includes a first light guide 5a and a second light guide 5b, and the first light guide 5a and the second light guide 5b.
  • the extending directions of the first region 5f1 and the second region 5f2 are different from each other.
  • two different places for example, the driver's seat side and the passenger seat side
  • 1 Surface illumination device 2 housing frame, 3A, 3B linear light source, 4, 4A visual field control film, 5 light guide plate, 5a first light guide, 5b second light guide, 5c side, 5d exit surface, 5e Back surface, 5f prism, 5f1, first area, 5f2, second area, 10 FPC, 11 LED (light source), 12 light bar, 13 prism sheet

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

Selon un mode de réalisation, la présente invention concerne un dispositif d'éclairage planaire (1) qui comporte une source de lumière et une plaque de guide de lumière (5). La source de lumière émet de la lumière dans une direction (B) prédéfinie. La plaque de guide de lumière (5) a une surface latérale (5c), une surface d'émission (5d) qui est une surface principale, et une surface arrière (5e) qui est l'autre surface principale. Un prisme (5f) est formé sur la surface arrière (5e), et la lumière incidente sur la surface latérale (5c) émise par la source de lumière est émise par la surface d'émission (5d). Le prisme (5f) a, s'il est coupé en parallèle à la direction (B) prédéfinie, une première zone (5f1) qui est grossièrement parallèle à la surface d'émission (5d) et une deuxième zone (5f2) qui est inclinée par rapport à la surface d'émission (5d). La première zone (5f1) et la deuxième zone (5f2) s'étendent dans une direction oblique par rapport à la direction (B) prédéfinie.
PCT/JP2018/009794 2017-04-21 2018-03-13 Dispositif d'éclairage planaire WO2018193755A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/605,037 US20210103086A1 (en) 2017-04-21 2018-03-13 Planar illumination device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2017084521 2017-04-21
JP2017-084521 2017-04-21
JP2017140760A JP2018181822A (ja) 2017-04-21 2017-07-20 面状照明装置
JP2017-140760 2017-07-20

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WO2018193755A1 true WO2018193755A1 (fr) 2018-10-25

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02106610U (fr) * 1989-02-09 1990-08-24
JP2002197915A (ja) * 2000-12-22 2002-07-12 Nec Corp フロントライト、液晶表示装置及び電子機器
JP2003185847A (ja) * 2001-12-19 2003-07-03 Konica Corp 線状光源となる導光体及び面状発光装置
JP2006278251A (ja) * 2005-03-30 2006-10-12 Nippon Leiz Co Ltd 導光板および平面照明装置
JP2009540503A (ja) * 2006-06-05 2009-11-19 ピクストロニクス，インコーポレイテッド 光学キャビティを有するディスプレイ装置
WO2013035788A1 (fr) * 2011-09-09 2013-03-14 コニカミノルタアドバンストレイヤー株式会社 Dispositif d'éclairage et montant d'éclairage
JP2013120360A (ja) * 2011-12-08 2013-06-17 Sharp Corp 表示装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02106610U (fr) * 1989-02-09 1990-08-24
JP2002197915A (ja) * 2000-12-22 2002-07-12 Nec Corp フロントライト、液晶表示装置及び電子機器
JP2003185847A (ja) * 2001-12-19 2003-07-03 Konica Corp 線状光源となる導光体及び面状発光装置
JP2006278251A (ja) * 2005-03-30 2006-10-12 Nippon Leiz Co Ltd 導光板および平面照明装置
JP2009540503A (ja) * 2006-06-05 2009-11-19 ピクストロニクス，インコーポレイテッド 光学キャビティを有するディスプレイ装置
WO2013035788A1 (fr) * 2011-09-09 2013-03-14 コニカミノルタアドバンストレイヤー株式会社 Dispositif d'éclairage et montant d'éclairage
JP2013120360A (ja) * 2011-12-08 2013-06-17 Sharp Corp 表示装置

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