JP2008007002A - In-cabin light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small size in-cabin light emitting device not generating nonuniformity of light emission. <P>SOLUTION: The in-cabin light emitting device 1 of the present invention is an in-cabin light emitting device having a light emission part 2 having an approximately cylindrical shape formed so as to transmit the light and having a portion, i.e., at least one part of an outer peripheral surface and extending in an axial direction becoming a light emission surface; a light source part 4 for irradiating the light to one end surface in an axial direction of the light emission part 2; and a light leading part 3 having an approximately plate-like shape for transmitting the light and having a side surface arranged so as to be opposed to the light emission surface 20 of the light emission part 2. The light leading part 3 has a light emission surface part 3c spread in a direction crossing to the surface on the whole surface. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle interior light emitting device that emits light that is provided in a vehicle interior.

  In general, an interior light for illuminating the interior of an automobile is provided on the ceiling of the interior. The interior lamp is provided, for example, at approximately the center of the ceiling of the passenger compartment. A conventional room lamp is made of a light-transmitting material such as acrylic, which is disposed perpendicular to the optical axis on a light source section that emits light, such as an LED, and an extension line in the optical axis direction of the LED of the light source section. And a lens cover having a function. The indoor lamp having such a configuration can emit strong light (bright light) from the vicinity of the optical axis of the LED, but there is a problem that light in a portion away from the optical axis is weak and uneven light emission occurs. . In addition, there is a problem that the LED and the lens cover need to be arranged in the optical axis direction, and the thickness of the indoor lamp is increased.

  For such a problem, for example, Patent Document 1 discloses a thin room lamp that suppresses uneven light emission. The indoor lamp described in Patent Document 1 has a light source in which a plurality of light emitting diodes are arranged in parallel, one side end surface as a light incident surface, and a curved surface in parallel with the light incident surface on either the upper surface or the lower surface. An indoor lamp having a transparent light guide plate in which a plurality of grooves are arranged in parallel to form an irregular reflection surface is disclosed. This interior light uniformly illuminates the vehicle interior by irregularly reflecting light incident on the light guide plate from the light source through the light incident surface in multiple directions by a plurality of grooves on the irregular reflection surface of the light guide plate.

However, the indoor lamp disclosed in Patent Document 1 has a problem in that it is necessary to arrange a large number of LEDs, and the number of required LEDs increases when the light guide becomes large. In addition, when the light guide becomes large, there is a problem that the number of LEDs increases and the whole physique becomes large.
JP 2000-127847 A

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the small light-emitting device for vehicle interiors which light emission nonuniformity does not arise.

  In order to solve the above-mentioned problems, the present invention has been accomplished as a result of repeated studies on a light emitting device for vehicle interior.

  A light emitting device for a vehicle interior according to the present invention has a substantially columnar shape formed so as to be able to transmit light, and a light emitting portion in which at least a part of the outer peripheral surface and extending in the axial direction serves as a light emitting surface; A vehicle interior having a light source part that irradiates light on one end face in the axial direction of the light source, and a light guide part that has a substantially plate shape that transmits light and that has a side surface disposed to face the light emitting surface of the light emitting part The light guide device is characterized in that a light emitting surface portion that spreads in a direction intersecting the surface of the light guide portion is distributed over the entire surface.

  The light emitting device for vehicle interior according to the present invention has a light emitting surface portion formed on the entire surface of the light guide portion, and has a configuration that does not cause uneven light emission.

  In addition, the light emitting device for a vehicle interior according to the present invention has a configuration in which the light emitting unit imparts light to the light guiding unit having the light emitting surface portion, so that the thickness of the light guiding unit and the size of the light source unit are not directly related. Yes. That is, even if the size of the light source unit is increased, the thickness of the light guide unit may not be increased. The interior light emitting device of the present invention can keep the overall thickness thin.

  Furthermore, the light-emitting device for a vehicle interior according to the present invention is not visible from the vehicle interior side through the light guide when attached to the vehicle, and the appearance when not lit is improved.

  The light emitting device for vehicle interior according to the present invention includes a light emitting unit, a light source unit, and a light guide unit.

  The light emitting portion is a member having a substantially columnar shape formed so as to be able to transmit light, and at least a part of the outer peripheral surface extending in the axial direction is a light emitting surface. By having a substantially columnar shape formed so that light can be transmitted, by irradiating light to one end face in the axial direction, at least a part of the outer peripheral surface that extends in the axial direction emits light.

  A light source part is a member which irradiates light to one end surface of the axial direction of a light emission part. That is, the light source unit emits light, the light emitted from the light source unit is irradiated to the light emitting unit, and one side surface (light emitting surface) of the light emitting unit emits light. The light source part should just emit light, for example, can mention a light bulb and LED, and it is more preferable that it is LED.

  The light guide unit is a member having a plate shape that transmits light and having a side surface opposed to the light emitting surface of the light emitting unit. The light guide unit irradiates the side surface with light emitted from the light emitting surface of the light emitting unit. The light guide unit emits light when the side surface is irradiated with light emitted from the light emitting unit.

  In the vehicle interior light emitting device of the present invention, the light emitting surface portion in which the light guide portion extends in the direction intersecting the surface of the light guiding portion is distributed over the entire surface. The light emitting surface portion changes (reflects) light incident from the side surface facing the light emitting surface in the surface direction (thickness direction of the light guide portion). This light change causes the vehicle interior light emitting device to emit light. And since this light emission surface part was distributed over the whole surface of a light-guide plate, the whole surface of a light-guide plate will light-emit. It is preferable that the light emitting surface portion is uniformly distributed on the light guide plate.

  The light emitting surface portion is preferably formed of an interface provided in the light guide plate. That is, the light emitting surface portion is preferably an interface of different materials. This interface changes the traveling direction of light transmitted through the light guide. Since the light guide part has the light emitting surface part in the thickness direction, the traveling direction of the light passing through the light guide part changes in the surface direction at the light emitting surface part. As a result, the planar light emitter of the present invention emits light at the light emitting surface portion. In the vehicle interior light emitting device of the present invention, since the light emitting surface portion is formed to be inclined, the figure formed by the light emitting surface portion can be seen three-dimensionally when light is emitted.

  The light emission surface part should just spread in the direction which cross | intersects with respect to the surface of a light guide part, and it does not specifically limit about the angle of the surface and the surface of a light guide part. It is preferable that the surface where the light emitting surface portion spreads and the surface of the light guide portion form an angle of 30 to 40 °.

  The light emitting surface portion is preferably composed of an interface where members having different refractive indexes are in contact with each other. When light passes through an interface between two materials having different refractive indexes, the traveling direction of the light changes due to the difference in refractive index between the two materials. In the planar light-emitting body of the present invention, the light emitting surface portion is made of an interface of members having different refractive indexes, so that the light traveling inside the light guide portion is the light emitting surface portion (interface) and the traveling direction thereof is the surface of the light guide portion. Can be changed in direction. That is, the light emitting surface portion emits light. And the light from which the advancing direction was changed is visually recognized as light emission of a planar light-emitting body through a surface part.

  The light emitting surface portion is preferably formed by an interface between two materials having different refractive indexes, and one of the materials is preferably a material of a portion irradiated with light from the light source portion. That is, by using the material of the portion irradiated with the light from the light source unit, the light irradiated on the light emitting surface unit is sufficiently transmitted without causing scattering. One material is not particularly local as long as it can transmit light. For example, materials such as resin and glass can be used. A resin is preferable, and an acrylic resin is more preferable.

  The other of the two materials having different refractive indexes is not particularly limited as long as it is a material capable of causing a difference in refractive index through the light emitting surface portion. For example, a gas such as resin or glass that transmits light, or air can be used.

  In the vehicle interior light emitting device of the present invention, since the light emitting part is disposed on the side of the light guide part, it is possible to prevent the thickness from increasing.

  In the vehicle interior light emitting device of the present invention, if the light emitted from the light emitting surface of the light emitting unit is formed so as to uniformly strike the side surface of the light guiding unit, the light emitting unit and the light guiding unit may be integrated separately. It may be. More preferably, the light emitting part and the light guiding part are separate.

  The light emitting surface portion is preferably formed of a side wall surface of a recess provided on the front surface and / or the back surface of the light guide portion. Here, the concave portion indicates a portion that is recessed from the front surface and / or the outermost surface portion of the back surface of the light guide. The side wall surface of the recess extends in a direction intersecting the surface of the light guide unit. That is, the side wall surface of the concave portion provided in the light guide portion forms the light emitting surface portion. When the side wall surface of the concave portion forms the light emitting surface portion, the light emitting surface portion emits light due to the difference in refractive index between the material forming the light guide portion and air.

  The cross-sectional shape of the recess is not particularly limited. In other words, any cross-sectional shape that can form a side wall surface serving as a light emitting surface portion may be used. Here, the width (depth from the surface) of the side wall surface of the recess is preferably longer. That is, as the depth of the concave portion is increased, the light transmitted through the light guide portion is transmitted through the light emitting surface portion, and the amount of light traveling in the surface direction of the planar light emitter increases, and the light emission effect of the planar light emitter is increased. Will improve. In addition, as long as a recessed part is a cross-sectional shape which has a side wall surface used as a light emission surface part, even if it has a bottom face part, it does not need to have a bottom face part. Further, the side wall surface is not necessarily flat. That is, the side wall surface and the bottom surface of the recess may be curved. The cross-sectional shape of the concave portion may be any of a concave shape, a U shape, and a V shape. More preferably, the side wall surface of the recess has a V shape that is inclined with respect to the direction in which the light guide plate spreads. Further, the concave portion may be a textured uneven side wall surface formed in the light guide portion.

  It is preferable that the light emitting surface portion is composed of side wall surfaces of a plurality of grooves formed at equal intervals on the back surface of the light guide portion. In this case, the groove corresponds to the recess. When the side wall surface of the groove formed at equal intervals becomes the light emitting surface portion, each light emitting surface portion emits light. And since this groove | channel was formed in the whole surface of the light-guide plate, the whole surface of a light-guide plate light-emits uniformly. Further, since the grooves are formed on the back surface, the surface of the light guide plate is free from irregularities, and the light guide plate can be directly exposed to the vehicle interior.

  It is preferable that a groove consists of the side wall surface of the multiple types of groove | channel extended in a mutually different direction. By having a plurality of types of grooves, the area of the side wall surface of the groove serving as the light emitting surface portion is increased. As a result, light is emitted more uniformly. Further, by having a plurality of types of grooves extending in different directions, the direction in which the side wall surface that becomes the light emitting surface portion spreads is not constant. Thereby, the light diffused in the light guide part can be reflected on the surface of the light guide part. That is, not only the area of the light emitting portion increases, but also light emission becomes more uniform.

  It is preferable that the light emitting surface portion is made of a side wall surface of a concave portion formed on the back surface of the light guide portion. In this case, the fine unevenness of the texture corresponds to the recess. Since the light emitting surface portion is formed by the side wall surface of the concave portion of the embossed portion, the entire surface of the light guide plate emits light uniformly. In addition, since the wrinkles are formed on the back surface, the surface of the light guide plate is not uneven, and the light guide plate can be directly exposed to the vehicle interior.

  The light emitting portion is not limited to a substantially columnar shape as long as the light emitting surface can be formed on at least a part of the outer peripheral surface. Moreover, the cross-sectional shape of a substantially columnar shape may change. The light emitting part preferably has a shape having a constant cross-sectional shape such as a columnar shape or a prismatic shape. It is more preferable that the light emitting surface has a flat shape. That is, it is preferable that the light emitting portion has a columnar shape or a prismatic shape with a cross-sectional arc shape. And it is further more preferable that a light emission part has prismatic shape. When the light emitting portion has a prismatic shape, one side surface becomes a light emitting surface.

  The light emitting unit preferably has a back surface facing away from the light emitting surface, and a recess is preferably formed on the back surface. Since the recess is formed on the back surface of the light emitting unit, the light applied to the end surface of the light emitting unit proceeds in the direction of the light emitting surface. That is, the direction of the light irradiated on the end surface of the light emitting unit is changed to the light emitting surface direction. The cross-sectional shape of the concave portion is not limited as long as it is a shape that can change the direction of light in the direction of the light emitting surface. The recess is preferably composed of a plurality of grooves having inclined surfaces extending in a direction perpendicular to the direction in which the light emitting portion extends and intersecting the surface of the back surface. The back surface may be either a flat surface or a curved surface, like the light emitting surface, and is more preferably a flat surface.

  It is preferable that the depth of the concave portion becomes deeper as the distance from the light source portion becomes longer. As the depth of the concave portion increases, the amount of light whose direction of travel is bent by the action of the concave portion increases. In other words, in the present invention, as the distance from the light source portion increases, the amount of light whose direction of travel is bent by the action of the concave portion increases. The amount of light traveling through the light emitting unit decreases as the distance from the light source unit increases. That is, in the present invention, the amount of light traveling in the direction of the light emitting surface is increased even when the distance from the light source is increased, by changing the depth of the recess. As a result, the light emitting surface portion can emit uniform light.

  It is preferable that the light guide portion has a substantially band shape, and one side surface of the band shape faces the light emitting portion. In the vehicle interior light emitting device of the present invention, light from the light emitting surface portion is irradiated in the width direction from the side surface of the substantially band-shaped light guide portion. Thereby, a light guide part light-emits uniformly.

  It is preferable to have a cover that is disposed on the surface of the light guide unit and covers at least the light emitting unit and the light source unit. By covering at least the light emitting unit and the light source unit with the cover, the light emitting unit and the light source unit are not exposed, and light emission other than the light guide unit cannot be visually recognized, thereby improving the appearance. In addition, since the cover is provided, the vehicle interior light emitting device is not damaged even if an object in the vehicle interior collides.

  It is preferable to have a reflective layer that reflects light on the light guide plate on the back surface of the light guide. By having the reflective layer, the light traveling in the back surface direction of the light guide unit is reflected by the reflective layer and is irradiated again to the light guide unit. Moreover, when the light emitting device for vehicle interior according to the present invention does not emit light, the appearance when the light guide portion is viewed is improved. The reflective layer is not particularly limited, even if it is formed integrally with the light guide section or separate.

  The vehicle interior light-emitting device of the present invention can have the same configuration as the conventional vehicle interior light-emitting device except for the configuration described above.

  The vehicle interior light emitting device of the present invention can be used as a light emitting device for functional lighting such as interior lighting of a vehicle, interior illumination, interior lighting of a console box or a glove box.

  Hereinafter, the present invention will be described using examples.

  As an example of the present invention, a vehicle interior illumination was manufactured.

(Example 1)
The illumination of this example is shown in an exploded view in FIG. 1 and a cross-sectional view in FIG. FIG. 2 is a view showing a cross section at a substantially central portion of the light guide plate 3.

  The illumination 1 of the present embodiment includes light emitting members 2 and 2, a light guide plate 3, a light source unit 4, a case 5, a cover 6, and a back reflector 7.

  The light emitting member 2 is made of a transparent acrylic acrylic prism having a length of 740 mm and a square having a cross section of 5 × 5 mm. One side surface of the prism is the light emitting surface 20. A groove 22 extending in the direction perpendicular to the direction in which the light emitting member 2 extends is formed on the side surface 21 facing away from the light emitting surface 20 along the length direction of the light emitting member 2.

  The light guide plate 3 is made of a transparent acrylic plate having a strip shape (740 × 83 × 5 mm) whose length in the longitudinal direction substantially matches the length of the light emitting member 2. The light guide plate 3 has a plurality of grooves 30 extending in the longitudinal direction on the back surface 3b side. The groove 30 is formed in a V-shaped cross section with an opening having a width of 1.5 mm and a depth of 1.5 mm. Moreover, the groove 30 is formed in the state where the space | interval of the opening part was located in a line with 2.5 mm.

  The light guide plate 3 is disposed in a state where each of the pair of side surfaces 3 d and 3 e extending in the axial direction faces the light emitting surface 20 of the light emitting member 2. That is, the light emitting members 2 are arranged on both sides of the light guide plate 3 in the width direction.

  The light source unit 4 includes a light emitting diode 40. The light emitting diodes 40 are arranged in a state of facing the end surfaces in the axial direction of the light emitting member 2. That is, the light emitting member 2 irradiates the light emitting diodes 40 and 40 with both end surfaces in the axial direction. The light emitting diode 40 is electrically connected to a power source (not shown) provided outside the illumination 1 and emits light by power from the power source. The light emitted from the light emitting diode 40 is applied to the end face in the axial direction of the light emitting member 2 and facing the light emitting diode 40.

  The back reflector 7 is disposed in a state of facing the back 3 b of the light guide plate 3. The back reflector 7 is made of an aluminum plate.

  The case 5 holds and fixes the light emitting member 2, the light guide plate 3, and the light source unit 4. The case 5 has a holding part 50 having a concave cross section, and holds the light guide plate 3 and the light emitting diode 40 inside the holding part 50. Further, the cover 6 is airtightly joined and fixed to the opening of the holding unit 50.

  When the cover 6 is fixed to the case 5, the light emitting member 2, the light guide plate 3, and the light source unit 4 held by the holding unit 50 are fixed. Here, the cover 6 is formed in a shape that allows the light guide plate 3 to be fixed with its surface exposed.

  The illumination 1 of the present embodiment has a configuration in which the light emitting member 2, the light source unit 4, and the back reflector 7 are housed inside by a case 5 and a cover 6.

  Hereinafter, description will be given of light emission of the illumination 1 of this embodiment.

  First, in the illumination 1 of this embodiment, when the light emitting diode 40 is energized, the light emitting diode 40 emits light. The light emitted from the light emitting diode 40 is applied to the end face of the light emitting member 2. The light irradiated to the light emitting member 2 travels in the axial direction inside the light emitting member 2.

  The light traveling in the axial direction inside the light emitting member 2 reaches the side wall surface of the groove 22 of the light emitting member 2. The light reaching the side wall surface is bent (reflected) toward the light emitting surface 20 by the action of the side wall surface. Due to the difference in refractive index between the acrylic resin forming the light emitting member 2 and the outside air and the inclination of the side wall surface, the light reaching the side wall surface is reflected by the side wall surface, and its traveling direction is bent in the direction of the light emitting surface 20. Here, even if light is transmitted without causing reflection on the side wall surface of the groove 22, the light is applied to the side wall surface of the opposing groove 2, and reflection is generated on the side wall surface so that the light travels in the direction of the light emitting surface 20. It becomes like this. Furthermore, even if light passes through one groove 22, it is further reflected by the action of the next groove 22, so that the light travels in the direction of the light emitting surface 20. The light bent in the direction of the light emitting surface 20 is emitted from the light emitting surface 20, and the light emitting surface 20 emits light.

  The groove 22 is formed over the entire length direction of the light emitting member 2, and the entire light emitting surface 20 emits light. Moreover, since both end surfaces of the light emitting member 2 in the axial direction are respectively irradiated with the light emitting diodes 40, there is almost no difference in the amount of light between the end portion side and the central portion of the light emitting member 2. That is, light having no unevenness is emitted from the light emitting surface 20.

  Then, the light emitted from the light emitting surface 20 of the light emitting member 2 is applied to the side surfaces 3 d and 3 e of the light guide plate 3. Then, the inside of the light guide plate 3 is advanced.

  The light traveling inside the light guide plate 3 reaches the side wall surface 3 c of the groove 30 of the light guide plate 3. The light reaching the side wall surface 3 c is reflected on the side wall surface 3 c and changes the traveling direction toward the surface 3 a of the light guide plate 3. Then, the light is emitted from the surface 3 a of the light guide plate 3. By this action, the surface 3a of the light guide plate 3 emits light. The light emission of the light guide plate 3 is the same as the action of the light emitting surface 20 of the light emitting member 2 emitting light. In the present embodiment, since the light emitting surface 20 of the light emitting member 2 emits light uniformly, light of a uniform amount of light reaches the groove 30 provided parallel to the axial direction of the light emitting member 2 in the length direction. . Further, the light emitting members 2 are disposed on both sides of the light guide plate 3, so that a difference in the amount of light reaching the center portion and the end portion in the width direction of the light guide plate 2 does not occur. It shows that the light emission amount of the light guide plate 3 is uniform over the entire surface.

  Of the light traveling inside the light guide plate 3, the light scattered inside the light guide plate 3 and traveling in the direction of the back surface 3 b is reflected by the back surface reflection plate 7 provided facing the back surface 3 b of the light guide plate 3, The light is reflected by the light guide plate 3 and travels through the light guide plate 3 again.

  As described above, in the illumination 1 of the present embodiment, the light emitted from the light emitting diode 40 is irradiated from the light emitting member 2 to the light guide plate 3. And the side wall surface 3c of the groove | channel 30 is a light emission surface part with the light irradiated to the light-guide plate 3. FIG. In the illumination 1 of this embodiment, the entire surface of the light guide plate 3 emits light uniformly during light emission.

  In the illumination 1 of this embodiment, even when the light emitting diode 40 is not emitting light, external light such as sunlight passes through the light guide plate 3 and is reflected by the back reflector 7. The light reflected by the back reflector 7 is again transmitted through the light guide plate 3 and visually recognized. That is, the illumination 1 of the present embodiment has the back reflector 7 so that the appearance when not emitting light is also improved.

  In addition, the illumination 1 of the present embodiment has a configuration in which a member required for light emission is accommodated between the case 5 and the cover 6 and has a compact structure. Furthermore, since the light emitting member 2 is configured to give light to the light guide plate 3, the thickness of the light guide plate 3 and the size of the light source unit 4 are not directly related. That is, even if the size of the light source unit 4 is increased, the thickness of the light guide plate 3 may not be increased. Even if the thickness of the light guide plate 3 is increased, light can be applied to the groove 30 by the light emitting member 2, so that the size of the light source unit 4 does not have to be increased. And since it has the structure which has arrange | positioned the light source part 4 to the edge part side of the width direction, it is suppressed that the thickness of the illumination 1 whole increases by increasing the thickness of the light source part 4 partially.

(Example 2)
The present embodiment is an illumination having the same configuration as that of the first embodiment except that the interval between the grooves 30 of the light guide plate 3 is set to 1 mm.

  In this embodiment, the interval between the grooves 30 is formed to be short, so that the number of the grooves 30 is larger than that in the first embodiment. Thereby, the quantity of the light reflected in the surface 3a direction of the light-guide plate 3 increases, and a stronger light can be emitted.

  The effects other than these are the same as those in the first embodiment.

(Example 3)
The present embodiment is an illumination having the same configuration as that of the first embodiment except that the grooves 30 of the light guide plate 3 are formed in a mesh shape. The light guide plate 3 is shown in FIG. FIG. 3 is a bottom view showing the back surface 3 b of the light guide plate 3.

  As shown in the drawing, the groove 30 of the light guide plate 3 is formed in a state of extending at an angle of 45 ° with respect to the longitudinal direction of the light guide plate 3. Further, the grooves 30 were formed at intervals of 2.5 mm.

  In the present embodiment, the number of the grooves 30 per unit area is increased because the grooves 30 are formed in a mesh shape. Thereby, the quantity of the light reflected in the surface 3a direction of the light-guide plate 3 increases, and a stronger light can be emitted.

  The effects other than these are the same as those in the first embodiment.

Example 4
The present embodiment is an illumination having the same configuration as that of the first embodiment except that the grooves 30 are formed on the front surface 3a and the back surface 3b of the light guide plate 3, respectively. The light guide plate 3 is shown in FIGS. 4 is a top view showing the front surface 3 a of the light guide plate 3, FIG. 5 is a bottom view showing the back surface 3 b of the light guide plate 3, and FIG. 6 is a cross-sectional view of the light guide plate 3.

  The groove 300 on the surface 3 a of the light guide plate 3 is formed in a state extending at an angle of 45 ° with respect to the longitudinal direction of the light guide plate 3. Further, the groove 301 on the back surface 3 b of the light guide plate 3 is formed in a state extending at a 45 ° angle with respect to the longitudinal direction of the light guide plate 3 and in a direction symmetrical to the groove 300 on the front surface 3 a. The grooves 300 and 301 were each formed at an interval of 2.5 mm.

  The groove 30 of the light guide plate 3 of this embodiment is formed in a mesh shape as a whole by the grooves 300 and 301 formed on the front surface 3a and the back surface 3b.

  In this embodiment, the grooves 30 are formed in a net shape as a whole, and the number of the grooves 30 per unit area is increased. Thereby, the quantity of the light reflected in the surface 3a direction of the light-guide plate 3 increases, and a stronger light can be emitted.

  The effects other than these are the same as those in the first embodiment.

(Example 5)
The present embodiment is an illumination having the same configuration as that of the first embodiment except that a texture pattern is formed on the entire back surface 3b instead of the groove 30 of the light guide plate 3.

  The texture pattern of the light guide plate 3 is a pattern having a surface roughness of 0.5 mm formed by cloth texture.

  In this embodiment, a texture pattern is formed on the entire back surface 3 b of the light guide plate 3. The fine unevenness of the texture pattern functions in the same manner as the groove 30 of the first embodiment. Thereby, the surface 3a of the light guide plate 3 emits light as in the first embodiment.

  In this embodiment, a texture pattern is formed on the entire back surface 3b of the light guide plate 3, and this texture pattern causes the entire surface 3a of the light guide plate 3 to emit light without causing unevenness.

  The effects other than these are the same as those in the first embodiment.

It is an exploded view of the illumination of Example 1. It is sectional drawing of the illumination of Example 1. FIG. It is the figure which showed the light-guide plate of the illumination of Example 3. FIG. It is the figure which showed the light-guide plate of the illumination of Example 4. FIG. It is the figure which showed the light-guide plate of the illumination of Example 4. FIG. 6 is a cross-sectional view of an illumination light guide plate of Example 4. FIG.

Explanation of symbols

1: Illumination 2: Light-Emitting Member 20: Light-Emitting Surface 21: Side 22: Groove 3: Light Guide Plate 30: Groove 4: Light Source 40: Light-Emitting Diode 5: Case 6: Cover 7: Back Reflector

Claims (8)

A light emitting portion having a substantially columnar shape formed so as to be able to transmit light, and a portion extending in the axial direction at least a part of the outer peripheral surface being a light emitting surface;
A light source unit for irradiating light to one end face in the axial direction of the light emitting unit;
A light guide portion having a substantially plate shape that transmits light, and a side surface disposed to face the light emitting surface of the light emitting portion;
A vehicle interior light emitting device comprising:
The light guide part has a light emitting surface part that spreads in the direction intersecting the surface of the light guide part, and is distributed over the entire surface.   The light emitting device for a vehicle interior according to claim 1, wherein the light emitting surface portion includes a side wall surface of a recess provided on a front surface and / or a back surface of the light guide portion.   The light emitting device for a vehicle interior according to claim 2, wherein the light emitting surface portion includes side wall surfaces of a plurality of grooves formed at equal intervals on the back surface of the light guide portion.   The light emitting device for a vehicle interior according to claim 3, wherein the groove is formed of side walls of a plurality of types of grooves extending in different directions.   The light emitting device for a vehicle interior according to claim 2, wherein the light emitting surface portion is formed by a side wall surface of a concave portion formed on a back surface of the light guide portion.   The light emitting device for a vehicle interior according to claim 1, wherein the light emitting unit has a back surface facing the light emitting surface, and a recess is formed on the back surface.   The vehicle interior light emitting device according to claim 1, wherein the light guide portion has a substantially strip shape, and one side surface of the strip shape faces the light emitting portion.   The vehicle interior light-emitting device according to claim 1, further comprising a cover disposed on a surface of the light guide unit and covering at least the light-emitting unit and the light source unit.

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