WO2022264764A1 - 導光板及びこれを用いた発光装置 - Google Patents
導光板及びこれを用いた発光装置 Download PDFInfo
- Publication number
- WO2022264764A1 WO2022264764A1 PCT/JP2022/021335 JP2022021335W WO2022264764A1 WO 2022264764 A1 WO2022264764 A1 WO 2022264764A1 JP 2022021335 W JP2022021335 W JP 2022021335W WO 2022264764 A1 WO2022264764 A1 WO 2022264764A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light
- light guide
- plate
- guide member
- width direction
- Prior art date
Links
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- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
-
- 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
- B60Q2500/00—Special features or arrangements of vehicle interior lamps
- B60Q2500/20—Special features or arrangements of vehicle interior lamps associated with air conditioning arrangements
-
- 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
- B60Q3/78—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for generating luminous strips, e.g. for marking trim component edges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present disclosure relates to a light guide plate and a light emitting device using the same.
- indicator devices and lighting devices are composed of light sources using LEDs (Light Emitting Diodes), lamps, etc., and light guide plates using transparent acrylic resin, polycarbonate resin, etc. Light emitted from a light source is incident on the light entrance surface of the light guide plate, guided into the light guide plate, and emitted outside from the light exit surface, thereby being used for illumination display and illumination.
- LEDs Light Emitting Diodes
- lamps etc.
- light guide plates using transparent acrylic resin, polycarbonate resin, etc.
- Patent Document 1 discloses an indicator device used in electronic equipment such as AV equipment.
- FIG. 7 is a perspective view showing a light guide plate as a reference example.
- the light guide plate 111 shown in FIG. 7 includes a light incident surface 112 on which light enters, a light exit surface 113 facing the light incident surface 112 and from which the light incident from the light incident surface 112 exits, and a light incident surface 112 from which the light enters. and a flat light guide member 114 that guides light to the light exit surface 113 .
- the light guide member 114 includes a light entrance portion 115 , a widening portion 116 and a light exit portion 117 .
- a light entrance surface 112 is formed in the light entrance portion 115
- a light exit surface 113 is formed in the light exit portion 117 .
- the plate width of the light guide member 114 widens outward in the plate width direction from the light incident surface 112 toward the light exit surface 113 .
- the light emitting portion 117 is provided with a shape (convex portion 118) that protrudes in the light emitting direction, and the light emitting surface 113 is formed on the side of the convex portion 118 from which the light is emitted.
- the plate thickness of the light guide member 114 on the light exit surface 113 side is constant in the plate width direction.
- a light source 102 for emitting light to the light incident surface 112 is provided at a position facing the light incident surface 112 of the light guide plate 111 .
- the light source 102 is arranged so as to be positioned at the center in the width direction of the light incident surface 112 .
- Light emitted from the light source 102 enters the light guide plate 111 through the light entrance surface 112 , propagates through the light guide member 114 , and then exits through the light exit surface 113 .
- the light from the light source 102 is sufficiently guided to the central portion of the light guide plate 111 in the plate width direction, while the light source 102 is sufficiently guided to the end portions of the light guide plate 111 in the plate width direction. It was difficult to guide the light from 102 sufficiently. As a result, the central portion of the light exit surface 113 is easy to shine, while the edge portions are difficult to shine, so the brightness cannot be uniform throughout the plate width direction, resulting in uneven light.
- Patent Document 1 a triangular concave portion for reflecting light is provided in the vicinity of the light source of the light guide plate, but sufficient consideration is given to the light unevenness on the light exit surface 113 side of the light guide member 114 described above. I didn't.
- the present disclosure has been made in view of such circumstances, and an object thereof is to provide a light guide plate that can prevent light unevenness and improve appearance, and a light emitting device using the same.
- the light guide plate of the present disclosure includes a light incident surface on which light is incident, a light exit surface facing the light incident surface and emitting the light incident from the light incident surface, and the light incident surface.
- a flat light guide member that guides the light incident from the light surface to the light output surface, the light guide member having a widened portion that expands outward in the plate width direction from the light input surface toward the light output surface.
- the light guide member In a cross-section parallel to the light exit surface on the light exit surface side of the light guide member, the light guide member has at least one end in the plate width direction on the side far from the light entrance surface having a plate thickness equal to that of other portions. Thicker than plate thickness.
- the plate thickness of the light guide member at least at one end in the plate width direction on the side far from the light input surface is larger than that of the other portion. It is thicker than the plate thickness. Therefore, the light can be sufficiently guided to the edge of the light guide plate in the plate width direction (particularly, the edge far from the light incident surface).
- the plate thickness of the light emitting surface side of the light guide member is constant in the plate width direction, the brightness can be more uniform throughout the plate width direction, and light unevenness can be prevented. This improves the appearance.
- FIG. 1 is a perspective view showing a light emitting device according to a first embodiment of the present disclosure
- FIG. 1 is a perspective view showing a light guide plate according to a first embodiment of the present disclosure
- FIG. 1 is a vertical cross-sectional view showing a light guide plate according to a first embodiment of the present disclosure
- FIG. 5 is a perspective view showing a light guide plate according to a second embodiment of the present disclosure
- FIG. 11 is a vertical cross-sectional view showing a light guide plate according to a third embodiment of the present disclosure
- FIG. 11 is a top view showing a light guide plate according to a third embodiment of the present disclosure
- It is a perspective view which shows the light-guide plate as a reference example.
- FIG. 1 is a perspective view showing operation switches of a vehicle air conditioner as a light emitting device 1 according to this embodiment.
- This operation switch is used for adjusting the temperature and the air volume of the air conditioner of the vehicle.
- a light-emitting device (operation switch) 1 includes a housing 3 , a light guide plate 11 , and a light source (not shown in FIG. 1 ) provided inside the housing 3 .
- the light guide plate 11 is arranged such that a light emitting surface 13 for emitting light is flush with the front surface (design surface) of the housing 3 .
- this operation switch 1 light is emitted from a light source not shown in FIG.
- the operation switch 1 is configured so that the location of the operation switch 1 can be known even at night.
- FIGS. 2 is a perspective view showing a light guide plate according to this embodiment
- FIG. 3 is a cross-sectional view of the light guide plate of FIG. 2 taken along the line AA.
- a cut plane AA is a vertical plane including a center line O passing through the center of the light guide plate 11 in the width direction.
- the light guide plate 11 has a light incident surface 12 on which light is incident, a light exit surface 13 facing the light incident surface 12 and from which the light incident from the light incident surface 12 is emitted, and a light exit surface 12 from which the light incident from the light incident surface 12 is emitted. and a flat plate-shaped light guide member 14 that leads to the light guide member 13 .
- the light entrance surface 12 and the light exit surface 13 are parallel.
- the light guide member 14 is made of a material that transmits visible light, and can be made of, for example, acrylic (PMMA; Polymethyl methacrylate).
- the light guide member 14 includes a light entrance portion 15 , a widening portion 16 and a light exit portion 17 .
- a light entrance surface 12 is formed in the light entrance portion 15
- a light exit surface 13 is formed in the light exit portion 17 .
- the widened portion 16 is formed between the light entrance portion 15 and the light exit portion 17 . In the widened portion 16 , the plate width of the light guide member 14 gradually expands outward in the plate width direction (both sides in the plate width direction) from the light entrance surface 12 toward the light exit surface 13 .
- the plate thickness of the widened portion 16 is constant at the central portion in the plate width direction, while at both end portions in the plate width direction, it is configured so that the thickness is gradually increased on both sides in the plate thickness direction from the light entrance surface 12 toward the light exit surface 13. It is
- the light emitting portion 17 is provided with a shape (convex portion 18) that protrudes in the light emitting direction, and the light emitting surface 13 is formed on the side of the convex portion 18 from which the light is emitted.
- the widened portion 16 and the convex portion 18 are connected by an inclined connection portion 19 .
- a side end of the inclined connection portion 19 is connected to the widened portion 16 .
- the plate thickness of the side end portions of the inclined connection portion 19 gradually increases from the central portion in the plate width direction toward both end sides in the plate width direction in a cross section parallel to the light exit surface 13 .
- the inclined connection portion 19 is inclined while narrowing the plate width inward in the plate width direction and decreasing the plate thickness toward the convex portion 18 side.
- the light output portion 17 is composed of a convex portion 18 and an inclined connection portion 19 .
- the light guide plate 11 has a shape symmetrical with respect to the cut plane AA (the vertical plane including the center line O).
- the plate thickness of the light guide member 14 on the light output surface 13 side is larger at both ends in the plate width direction than at other portions in a cross section parallel to the light output surface 13 .
- the plate thickness at both ends in the plate width direction is thicker than the plate thickness at the central portion in the plate width direction.
- the light exit surface 13 side of the light guide member 14 is the side closer to the light exit surface 13 than the light entrance surface 12 of the light guide member 14 .
- a light source 2 for emitting light to the light incident surface 12 is provided at a position facing the light incident surface 12 of the light guide plate 11 .
- the light source 2 is arranged on the center line O so as to be positioned at the center in the width direction of the light incident surface 12 .
- Light emitted from the light source 2 enters the light guide plate 11 through the light entrance surface 12 , propagates through the light guide member 14 , and then exits through the light exit surface 13 .
- an LED Light Emitting Diode
- the plate thickness at the light entrance surface 12 and the plate thickness at the light exit surface 13 are the same.
- the inclined connection portion 19 is formed so as to protrude from the upper and lower surfaces of the light guide member 14, and in FIG. 3, the plate thickness of the inclined connection portion 19 is made thicker than the other portions.
- a diffusion material that diffusely reflects light may be added to the light guide member 14 for the purpose of further promoting the diffusion of the light emitted from the light source 2 .
- the diffusing material may be distributed over the entire light guide member 14 .
- Beads can be mentioned as diffusion materials.
- the diameter of the beads can be approximately 10 ⁇ m, and the material of the beads can be silicon resin, for example.
- the amount of The diffusing material may be provided so that the density of the diffusing material is greater on the side.
- the light guide member 14 can be formed by molding a central resin having a low diffusion material particle density and an outer resin having a high diffusion material particle density in two colors.
- a side surface (a side surface facing the outside in the plate width direction) 20 (see FIG. 2) of the widened portion 16 may be provided with an uneven shape.
- the uneven shape include a sawtooth shape (jagged shape) and a shape in which small unevenness spreads over the entire surface (rough shape).
- the light guide member 14 in a cross section parallel to the light exit surface 13 on the light exit surface 13 side of the light guide member 14, the light guide member 14 is a plate having a different plate thickness at both ends in the plate width direction. It is thicker than the thickness (for example, the central portion in the plate width direction). Therefore, the light can be sufficiently guided to the edge of the light guide plate 11 in the plate width direction.
- the plate thickness of the light-emitting surface 13 side of the light guide member 14 is constant in the plate width direction, the brightness can be more uniform throughout the plate width direction, and light unevenness can be prevented. . This improves the appearance.
- light can be sufficiently guided to both ends of the light guide member 14 compared to the case where only one end in the plate width direction is thicker than the other portions. Thereby, light unevenness can be prevented more reliably.
- the side surface 20 of the widened portion 16 is provided with an uneven shape, the light incident from the light incident surface can be diffusely reflected by the side surface 20 and guided to the light output surface 13 . Therefore, diffused reflection can be promoted.
- the diffusing material is provided over the entire surface, irregular reflection can be promoted, so that light can be emitted more uniformly from the light emitting surface 13 of the light guide plate 11 .
- the light emitting device 1 of the present embodiment includes the light guide plate 11 described above, light can be emitted from the light emitting surface 13 evenly.
- a second embodiment of the present disclosure will be described below with reference to FIG.
- the basic configuration of this embodiment is that, instead of the light guide member 14, a light guide member 34 is used in which only one end in the plate width direction on the light output surface 13 side is thicker than the other portions. is different from the first embodiment. More specifically, the light guide plate 31 of this embodiment has a shape in which the light guide plate 11 of the first embodiment is cut in half along the cut plane AA. Other components are basically the same as those of the first embodiment described above. Therefore, in the present embodiment, this different part will be explained, and the explanation of other overlapping parts will be omitted. In addition, the same code
- FIG. 4 is a perspective view showing the light guide plate 31 of this embodiment.
- the light guide member 34 of this embodiment includes a light entrance portion 15 , a widened portion 36 and a light exit portion 37 .
- the widened portion 36 is formed between the light entrance portion 15 and the light exit portion 37 .
- the plate width of the light guide member 34 gradually widens only on one side (the side farther from the light incident surface 12 ) outward in the plate width direction from the light entrance surface 12 toward the light exit surface 13 .
- the plate thickness of the widened portion 36 gradually increases in both sides in the plate thickness direction from the light entrance surface 12 toward the light exit surface 13 at one end (the side farther from the light entrance surface 12 ) in the width direction. It is configured to be constant at one end in the plate width direction (the side closer to the light incident surface 12).
- the widened portion 36 and the convex portion 18 are connected by an inclined connection portion 39 .
- a side end portion of the inclined connection portion 39 is connected to the widened portion 36 .
- the plate thickness of the side end portion of the inclined connection portion 39 is such that, in a cross section parallel to the light exit surface 13, one side (the side farther from the light entrance surface 12) of the plate width direction end is the other side (the side closer to the light entrance surface 12). The thickness gradually increases from the width direction end of the plate.
- the inclined connection portion 39 is inclined while narrowing the plate width inward in the plate width direction only on one side (the side farther from the light incident surface 12 ) toward the convex portion 18 side while reducing the plate thickness.
- the light output portion 37 is composed of the convex portion 18 and the inclined connection portion 39 .
- the plate thickness of the light guide member 34 on the side of the light exit surface 13 is such that, in a cross section parallel to the light exit surface 13, at least one end in the plate width direction on the side far from the light entrance surface 12 is thicker than the other portions. It is thicker than the plate thickness. Specifically, the plate thickness on one end side in the plate width direction (the side farther from the light incident surface 12) is thicker than the plate thickness on the other end side in the plate width direction (the side closer to the light incident surface 12).
- the light guide member 31 in a cross section parallel to the light exit surface 13 on the light exit surface 13 side of the light guide member 34, the light guide member is a plate at one end in the plate width direction far from the light entrance surface 12.
- the thickness is thicker than the plate thickness of other parts. Therefore, the light can be sufficiently guided to the edge of the light guide plate 31 in the plate width direction (particularly, the edge far from the light incident surface 12).
- the plate thickness of the light-emitting surface 13 side of the light guide member 34 is constant in the plate width direction, the brightness can be more uniform throughout the plate width direction, and light unevenness can be prevented. . This improves the appearance.
- a third embodiment of the present disclosure will be described below with reference to FIGS.
- the basic configuration of the present embodiment is that, instead of the light guide member 14, a light guide member 54 having a constant thickness in the width direction of the widened portion 56 is used except for a part, and that the light guide member 14 is used.
- the difference from the first embodiment is that a concave portion 61 is formed on the light emitting surface 13 side of the optical member 54 .
- Other components are basically the same as those of the first embodiment described above. Therefore, in the present embodiment, this different part will be explained, and the explanation of other overlapping parts will be omitted.
- symbol is attached
- FIG. 5 is a vertical cross-sectional view showing the light guide plate 51 of this embodiment, and is a cross-sectional view taken along the line BB in FIG.
- a cut plane BB is a vertical plane including a center line O passing through the center of the light guide plate 51 in the width direction.
- FIG. 6 is a top view showing the light guide plate 51 according to this embodiment.
- the light guide member 54 of this embodiment includes a light entrance portion 15 , a widening portion 56 and a light exit portion 57 .
- the widened portion 56 is formed between the light entrance portion 15 and the light exit portion 57 .
- the plate width of the light guide member 54 expands outward in the plate width direction (both sides in the plate width direction) from the light entrance surface 12 toward the light exit surface 13 .
- the plate thickness of the widened portion 56 is configured to be uniform from the light entrance surface 12 toward the light exit surface 13 except for a portion.
- the widened portion 56 and the convex portion 18 are connected by an inclined connection portion 59 .
- a side end portion of the inclined connection portion 59 is connected to the widened portion 56, and the plate thickness of the side end portion is constant in the plate width direction.
- the inclined connection portion 59 is inclined while narrowing the plate width inward in the plate width direction and decreasing the plate thickness toward the convex portion 18 side.
- a concave portion 61 having a rectangular shape in top view is formed in the central portion in the plate width direction.
- recesses 61 are also formed on the lower surface of the light guide member 54 at positions corresponding to the recesses 61 on the upper surface. Due to the concave portions 61 formed in the upper and lower surfaces of the light guide member 54 , the thickness of the light guide member 54 on both sides in the plate width direction in a cross section parallel to the light exit surface 13 and including the concave portions 61 is the other portion (plate width direction central portion) is thicker than the plate thickness.
- the plate thickness at the light entrance surface 12 and the plate thickness at the light exit surface 13 are the same.
- the recessed portion 61 is not limited to a stepped recessed portion with respect to the surrounding portion as shown in FIG.
- a concave portion 61 is formed on the light exit surface 13 side of the light guide member 54 in the widened portion 56 . Therefore, in the cross section parallel to the light exit surface 13 and including the concave portion 61 , the light guide member 54 is thicker at both ends in the width direction than at the central portion in the width direction. As a result, the plate thickness of the portion of the light guide member 54 at the center in the plate width direction on the side of the light emitting surface 13 with good light guiding property is thinner than that of the both ends in the plate width direction. Light can be guided more uniformly. As a result, compared to the case where the concave portion 61 is not formed, it is possible to achieve more uniform brightness in the entire plate width direction, and to prevent light unevenness. This improves the appearance.
- the case of using the light guide member 54 in which the plate thickness in the plate width direction of the widened portion 56 is constant in the portion where the concave portion 61 is not formed will be described as an example.
- the light guide member 14 of the first embodiment may be used instead of the light guide member 54, and the concave portion 61 may be formed in the light guide member 14.
- the light guide plate is not limited to this, and can be used for linear illumination. It is not particularly limited as long as it is a light emitting device.
- the light guide plates (11, 31, 51) described in each of the embodiments described above are understood, for example, as follows.
- the light guide plate of the present disclosure includes a light incident surface (12) on which light is incident, a light exit surface (13) that faces the light incident surface and outputs the light that has entered from the light incident surface, and a light that has entered from the light incident surface. and a flat light guide member (14, 34, 54) that guides the light to the light output surface, and the light guide member includes a widened portion (16, 36, 56), and in a cross section parallel to the light output surface on the light output surface side of the light guide member, the light guide member has a plate thickness at least at one end in the plate width direction on the side farther from the light input surface than the plate thickness of the other portion. thicker than
- the plate thickness of the light guide member at least at one end in the plate width direction on the side far from the light input surface is larger than that of the other portion. It is thicker than the plate thickness. Therefore, the light can be sufficiently guided to the edge of the light guide plate in the plate width direction (particularly, the edge far from the light incident surface).
- the plate thickness of the light emitting surface side of the light guide member is constant in the plate width direction, the brightness can be more uniform throughout the plate width direction, and light unevenness can be prevented. This improves the appearance.
- the light guide member in a cross section parallel to the light exit surface on the light exit surface side of the light guide member, the light guide member may be thicker at both ends in the plate width direction than at other portions.
- the thickness of the light-emitting surface of the light guide member on both sides in the plate width direction is thicker than the plate thickness of other portions (for example, the central portion in the plate width direction), only the one end side in the plate width direction is thicker than the other portion. Light can be sufficiently guided to both ends of the light guide member compared to the case where the thickness is thicker than the portion. Thereby, light unevenness can be prevented more reliably.
- the light guide plate of the present disclosure may have an uneven shape on the side surface of the widened portion.
- the side surface of the widened portion is provided with an uneven shape, the light incident from the light incident surface can be diffusely reflected on the side surface and guided to the light output surface. Therefore, diffused reflection can be promoted.
- a diffusion material may be provided over the entire light guide plate of the present disclosure.
- the diffusing material is provided over the entire surface, diffused reflection can be promoted, so that light can be emitted more uniformly from the light emitting surface of the light guide plate.
- the diffusing material include silicone resin beads.
- the end portion of the light guide member on the light exit surface side may have a shape that protrudes toward the direction in which the light is emitted.
- the light emitting surface can be used as the design surface of the switch when applied to, for example, an in-vehicle switch. can be made flush. This can improve the appearance of the switch.
- a light emitting device (1) of the present disclosure includes the light guide plate described above and a light source (2) provided at a position facing the light incident surface of the light guide plate and emitting light to the light incident surface.
- the light-emitting device of the present disclosure can be suitably used, for example, as an in-vehicle switch.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
Abstract
Description
なお、以下の実施形態では、発光装置として車内用空調装置の操作スイッチに適用した場合を一例として説明するが、本開示はこれに限定されない。
以下、本開示の第1実施形態について、図1を用いて説明する。
図1は、本実施形態に係る発光装置1としての車両用空調装置の操作スイッチを示す斜視図である。この操作スイッチは、車両の空調機器の温度や風量の調節等に使用される。
発光装置(操作スイッチ)1は、筐体3と、導光板11と、筐体3内部に設けられた図1中不図示の光源とを備える。導光板11は、光を出射する出光面13が筐体3の前面(意匠面)と面一になるように配置されている。この操作スイッチ1においては、図1中不図示の光源より光が出射され、出射された光は導光板11を通過し、出光面13から外部に出射される。このように、操作スイッチ1は、夜間であっても操作スイッチ1の場所が分かるように構成されている。
図2は、本実施形態に係る導光板を示す斜視図であり、図3は図2の導光板のA-A断面図である。切断面A-Aは、導光板11の幅方向中央を通る中心線Oを含む鉛直面である。導光板11は、光が入射する入光面12と、入光面12と対向するとともに入光面12から入射した光を出射する出光面13と、入光面12から入射した光を出光面13に導く平板状の導光部材14と、を備えている。入光面12と出光面13とは平行とされている。導光部材14は、可視光を透過する材料が用いられ、例えばアクリル(PMMA;Polymethyl methacrylate)製とすることができる。
導光板11は、切断面A-A(中心線Oを含む鉛直面)について対称とされた形状とされている。
本実施形態に係る導光板11においては、導光部材14の出光面13側における出光面13と平行な断面において、導光部材14は、板幅方向両端側の板厚が他の部分の板厚(例えば板幅方向中央部)よりも厚くなっている。従って、導光板11の板幅方向の端部にまで十分に光を導くことができる。これにより、導光部材14の出光面13側における板厚を板幅方向で一定としていた場合に比べ、板幅方向全体としてより均一な明るさとすることができ、光ムラを防止することができる。これにより、見映えが向上する。
特に、板幅方向一端側のみを他の部分よりも厚くしている場合に比べ、導光部材14の両端部に十分に光を導くことができる。これにより、光ムラをより確実に防止することができる。
以下、本開示の第2実施形態について、図4を用いて説明する。
本実施形態の基本構成は、導光部材14の代わりに、出光面13側において板幅方向一端側の板厚のみが他の部分の板厚よりも厚い導光部材34が用いられている点が第1実施形態とは異なっている。より具体的には、本実施形態の導光板31は、第1実施形態の導光板11を切断面A-Aに沿って半分にした形状となっている。その他の構成要素については上述した第1実施形態と基本的に同様である。よって、本実施形態においては、この異なっている部分を説明し、その他の重複するものについては説明を省略する。
なお、第1実施形態と同一の構成要素については、同一の符号を付してその重複した説明を省略する。
本実施形態に係る導光板31においては、導光部材34の出光面13側における出光面13と平行な断面において、導光部材は、入光面12から遠い側における板幅方向一端側の板厚が他の部分の板厚よりも厚くなっている。従って、導光板31の板幅方向の端部(特に、入光面12から遠い側の端部)にまで十分に光を導くことができる。これにより、導光部材34の出光面13側における板厚を板幅方向で一定としていた場合に比べ、板幅方向全体としてより均一な明るさとすることができ、光ムラを防止することができる。これにより、見映えが向上する。
以下、本開示の第3実施形態について、図5,6を用いて説明する。
本実施形態の基本構成は、導光部材14の代わりに、拡幅部56の板幅方向の板厚が一部を除いて一定となっている導光部材54が用いられている点、及び導光部材54の出光面13側に凹部61が形成されている点が第1実施形態とは異なっている。その他の構成要素については上述した第1実施形態と基本的に同様である。よって、本実施形態においては、この異なっている部分を説明し、その他の重複するものについては説明を省略する。
なお、第1実施形態と同一の構成要素については、同一の符号を付してその重複した説明を省略する。
本実施形態に係る導光板51においては、拡幅部56における導光部材54の出光面13側に凹部61が形成されている。従って、導光部材54は、出光面13と平行かつ凹部61を含む断面において、板幅方向両端側の板厚が板幅方向中央部よりも厚くなっている。これにより、導光部材54の出光面13側における板幅方向中央部の導光性の良い部分の板厚が、板幅方向両端部よりも薄くなるため、出光面13に板幅方向全体としてより均一に光を導くことができる。これにより、凹部61を形成しなかった場合に比べ、板幅方向全体としてより均一な明るさとすることができ、光ムラを防止することができる。これにより、見映えが向上する。
2 光源
3 筐体
11,31,51 導光板
12 入光面
13 出光面
14,34,54 導光部材
15 入光部
16,36,56 拡幅部
17,37,57 出光部
18 凸部
19、39,59 傾斜接続部
20 側面
61 凹部
O 中心線
Claims (6)
- 光が入射する入光面と、
前記入光面と対向するとともに前記入光面から入射した前記光を出射する出光面と、
前記入光面から入射した前記光を前記出光面に導く平板状の導光部材と、
を備え、
前記導光部材は、前記入光面から前記出光面に向かうに従って板幅方向外側に拡がる拡幅部を有し、
前記導光部材の前記出光面側における前記出光面と平行な断面において、前記導光部材は、少なくとも前記入光面から遠い側における板幅方向一端側の板厚が他の部分の板厚よりも厚い導光板。 - 前記導光部材の前記出光面側における前記出光面と平行な断面において、前記導光部材は、板幅方向両端側の板厚が他の部分の板厚よりも厚い請求項1に記載の導光板。
- 前記拡幅部の側面には凹凸形状が設けられている請求項1又は2に記載の導光板。
- 拡散材が全体にわたって設けられている請求項1から3のいずれか一項に記載の導光板。
- 前記導光部材の前記出光面側端部は、前記光が出射される方向に向かって凸となる形状を有している請求項1から4のいずれか一項に記載の導光板。
- 請求項1から5のいずれか一項に記載の導光板と、
前記導光板の前記入光面に対向する位置に設けられ、前記入光面へ前記光を出射する光源と、
を備える発光装置。
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JP2006066399A (ja) * | 2004-08-27 | 2006-03-09 | Osram Opto Semiconductors Gmbh | 照明手段および一次光学素子 |
JP2006166378A (ja) * | 2004-12-10 | 2006-06-22 | Ricoh Co Ltd | 画像読取装置 |
JP2020013707A (ja) * | 2018-07-18 | 2020-01-23 | パナソニックIpマネジメント株式会社 | 照明器具 |
JP2020155265A (ja) * | 2019-03-19 | 2020-09-24 | 丸茂電機株式会社 | 壁面照射用のランプ、およびそれを用いた照明器具 |
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US6022117A (en) * | 1996-10-09 | 2000-02-08 | Canon Kabushiki Kaisha | Illuminating device for projecting light |
JP4888429B2 (ja) | 2008-03-18 | 2012-02-29 | 株式会社Jvcケンウッド | インジケータ装置 |
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JP2006066399A (ja) * | 2004-08-27 | 2006-03-09 | Osram Opto Semiconductors Gmbh | 照明手段および一次光学素子 |
JP2006166378A (ja) * | 2004-12-10 | 2006-06-22 | Ricoh Co Ltd | 画像読取装置 |
JP2020013707A (ja) * | 2018-07-18 | 2020-01-23 | パナソニックIpマネジメント株式会社 | 照明器具 |
JP2020155265A (ja) * | 2019-03-19 | 2020-09-24 | 丸茂電機株式会社 | 壁面照射用のランプ、およびそれを用いた照明器具 |
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