JP2010137793A - Vehicular interior lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular interior lighting system capable of improving appearance quality by a light emitting face to obtain more uniform illumination light. <P>SOLUTION: The system has a rod-like light guide body 9 for making light radiated from an LED light emission body 8 incident on a longitudinal end 9a, and emitting the light from an outer periphery 9b toward an opposite end face 9d while guiding the light inside; and a compartment side light guide member 10 having an illumination face 10d facing a space in an occupant cabin 2. A light incident face 10b is formed at a plate-like light guide body 10a for guiding the illumination light in a plate face extension direction of the compartment side light guide member 10 along a longitudinal direction at a position near the outer periphery 9b of the rod-like light guide body 9. Then, when the illumination light emitted from the outer periphery 9b is incident again from the light incident face 10b, the illumination face 10d formed into a curve can equally distribute an amount of light radiated in the compartment side space 2 so as to be constituted in a shape for drawing a quadratic curve for gradually changing a light guide length D from the light incident face 10b according to an extension length direction dimension X of the rod-like light guide body 9 from the LED light emission body 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle interior lighting device that is provided in a vehicle interior of an automobile and performs illumination.

Conventionally, as a vehicle interior lighting device, a lens member is provided in front of a light source such as a lamp, or a reflector that reflects the illumination light and guides the illumination light to the outside is provided. By forming a plurality of V-shaped concave grooves or convex strip-like reflecting portions as the dimming means on the lens member or reflector, etc., as the light source is separated from the light source, and reflecting in multiple directions, A vehicle interior light that is configured to obtain uniform illumination light is known (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 7-40283

  However, in such a conventional vehicle interior lighting device, the illumination light reflected in multiple directions by a plurality of discontinuous grooves formed in the reflecting member, the belt-like reflecting portion, or the like is emitted from the light emitting surface due to interference or the like. Even in the adjacent areas, the contrast between light and dark increases, and there is a possibility that the occupant will recognize the light unevenness.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle interior lighting device capable of improving the appearance quality by a light emitting surface that obtains more uniform illumination light.

  In order to achieve the above object, according to the first aspect of the present invention, the irradiation light from the light source is incident from the end surface in the longitudinal direction and guided toward the opposite end surface, and from the outer peripheral surface. An exiting rod-shaped light guide, a light incident surface portion that extends along the outer peripheral surface in the vicinity of the rod-shaped light guide and re-enters the emitted illumination light, and the re-entered illumination light A vehicle interior lighting device having a plate-shaped light guide having an illumination surface portion that illuminates a vehicle interior side space by guiding light in the width direction of the rod-shaped light guide, wherein the illumination surface portion is The vehicle interior lighting device is characterized in that the light guide length inside the plate-shaped light guide from the light incident surface portion to the illumination surface portion is set so as to decrease in a curve as the distance from the light source increases. .

  According to the present invention, when the illumination light of the light source is incident from the longitudinal end face of the rod-shaped light guide, the illumination light is guided while being attenuated along the longitudinal direction of the rod-shaped light guide.

  For this reason, the illumination light emitted from the outer peripheral surface of the rod-shaped light guide also gradually decreases as the distance from the light source increases in the longitudinal direction, and the illumination light re-entered from the light incident surface portion of the plate-shaped light guide. The amount of light is also reduced according to the position in the longitudinal direction from the light source.

  Therefore, the amount of light reaching the illumination surface portion by reducing the light guide length to the light incident surface portion of the plate-like light guide and the illumination surface portion located on the opposite side according to the longitudinal position from the light source. Can be made uniform, and the amount of emitted light can be made uniform at any location in the longitudinal direction of the illumination surface portion.

  Hereinafter, a vehicle interior lighting device according to the best mode of the present invention will be described with reference to the drawings.

  1 to 5 show a vehicle interior lighting device according to an embodiment of the present invention.

  First, in terms of the overall configuration, in the vehicle interior lighting device of this embodiment, as shown in FIG. 2, the front position of the passenger compartment 2 of the automobile 1 is located between the left and right front pillar members 3 and 3. The instrument panel 4 is extended along the vehicle width direction.

  The instrument panel 4 is provided with a passenger seat side airbag device 5 provided with a lid portion on the side surface of the passenger compartment 2, and below the passenger seat side airbag device 5 is a storage unit. A passenger seat glove box 6 is installed.

  Further, between the passenger seat side airbag device 5 and the passenger seat glove box 6, the passenger seat side rear side surface portion 4 a of the instrument panel 4 has an illumination surface portion 10 d curved substantially along the vehicle width direction. An illumination device 7 is provided as a vehicle interior illumination device facing the interior space of the vehicle compartment 2.

  The illumination device 7 includes an LED light emitter 8 as a light source provided in the instrument panel 4 and irradiation light from the LED light emitter 8 from the longitudinal end surface 9a and toward the opposite end surface 9d. And a rod-shaped light guide 9 that emits light from each part of the outer peripheral surface 9b while guiding the inside.

  This rod-shaped light guide 9 has a round bar shape mainly composed of a transparent resin, and the outer peripheral surface 9b is diffusely reflected by the illumination light guided to the inside, and irradiated to the outer side of the outer peripheral surface 9b. The illumination light deriving means is configured by providing fine irregularities on the entire surface.

  As shown in FIG. 4, the rod-shaped light guide 9 has a light quantity (luminance L) of illumination light emitted from the outer peripheral surface 9b in accordance with an internal light guide distance X in the extending direction from the light source. The transmittance is attenuated as a quadratic curve proportional to the square.

  Furthermore, this illumination device 7 has a vehicle interior side light guide member 10 as a plate-like light guide member.

  The material of the passenger compartment side light guide member 10 is mainly made of transparent resin, and, like the rod-like light guide member 9, the illumination light passing through the interior is a secondary proportional to the square of the light guide length inside. It is configured to decay as a curve.

  In this embodiment, the vehicle interior side light guide member 10 mainly includes a plate-like light guide 10 a that guides illumination light in the surface extending direction, and a latch that is latched by the instrument panel 4. A step portion 10b and a light guide attachment flange portion 10e are provided.

  In addition, the illumination device 7 of this embodiment has a cover member 11 that clamps the rod-shaped light guide 9 from the vehicle vertical direction together with the vehicle interior side light guide member 10.

  Among these, the rod-shaped light guide 9 is opposed to the outer peripheral surface 9b of the rod-shaped light guide 9 in a state where the rod-shaped light guide 9 is sandwiched and mounted on the vehicle interior side light guide member 10 as shown in FIG. A light incident surface portion 10b that extends and is positioned so as to be in the vicinity of a substantially equal distance along the longitudinal direction is located at the upper edge portion of the one end surface on the vehicle front side of the plate light guide 10a. Along the way.

  As shown in FIG. 1, a plurality of locating pins 12b and 12b are provided on the mounting flange portion 11b of the cover member 11 so as to project integrally.

  Further, a light guide attachment flange portion 10e is integrally extended from the vehicle interior side light guide member 10 toward the front of the vehicle in the horizontal direction.

  The mounting flange portion 11b is engaged with the upper surface side of the light guide mounting flange portion 10e in a state where the rod-shaped light guide member 10 is sandwiched, and is opened at a position corresponding to the locate pins 12b and 12b. The positioning is performed by inserting the locate pins 12b and 12b into the formed locate holes 12c and 12c.

  Further, screw holes 12d and 12d are formed on both sides of the locating holes 12c and 12c in the vehicle width direction so as to be spaced apart by a predetermined dimension.

  Screw members 12e and 12e inserted into screw insertion holes 12a and 12a formed in the vicinity of both ends in the vehicle width direction of the mounting flange portion 11b of the cover member 11 are screwed into these screw holes 12d and 12d, respectively. Then, the space between the vehicle compartment side light guide member 10 and the cover member 11 is fixed.

  Further, in this embodiment, a plurality of locking claw portions 13a... Are formed on the cover member 11 so as to protrude from the upper surface side of the plate-like light guide 10a. The locking holes 13b are inserted and locked respectively.

  And in the state which each latching nail | claw part 13a ... was latched by each latching hole part 13b ..., as shown in FIG. 3, the said rod-shaped light guide 9 is the said vehicle interior side light guide member 10 and The cover member 11 is sandwiched and fixed from the vehicle vertical direction.

  In this embodiment, the light incident surface portion 10b is opposed to the center 9c of the rod-shaped light guide 9 having a circular cross section so as to re-enter the illumination light emitted from the outer peripheral surface 9b most efficiently. Thus, they are provided at the same height in the vehicle vertical direction.

  And the plate-shaped light guide 10a of the said vehicle interior side light guide member 10 injected from the said light-incidence surface part 10b toward the vehicle rear (passenger compartment 2 direction) along the flat plate surface extending direction. Illuminating light is guided in the width direction of the rod-shaped light guide 9 and is disposed facing the vehicle interior 2 space, and is located on the opposite side of the vehicle front side end surface (the passenger compartment side). By illuminating from the illumination surface portion 10d provided on the end surface, the interior of the passenger compartment 2 that is the vehicle interior side space is illuminated.

  As shown in FIG. 5, the plate-shaped light guide 10a has a light guide length D inside the plate-shaped light guide 10a from the light incident surface portion 10b to the illumination surface portion 10d. It is configured to be illuminated uniformly at each vehicle width direction position.

  That is, according to the internal light guide distance X in the extending direction from the LED light emitter 8 of the outer peripheral surface 9b of the rod-shaped light guide 9 facing each light entrance surface 10b, the light entrance surface 10b. From the LED light emitter 8 as the light source, the light guide length D to the illumination surface portion 10d is reduced so as to be a function curve having a quadratic curve proportional to the square. The plate-shaped light guide body 10a of this embodiment is formed with a set cross-sectional shape.

  Moreover, in this embodiment, the illumination surface portion is arranged such that the light guide length D from the light incident surface portion 10b to the illumination surface portion 10d decreases in a curved manner as the distance from the LED light emitter 8 as the light source increases. 10d has a curved shape and is configured.

  Further, at the lower part of the vehicle interior side light guide member 10, there is a locking step portion 10 c that is locked to the end portion 4 c of the core member 4 b at the periphery of the finisher opening portion 4 a formed in the instrument panel 4. Is provided.

  And, the lower surface side of the plate-like light guide 10a is brought into pressure contact with the upper surface side of the end portion of the skin material 4e covering the cushioning material 4d made of foam, and is engaged with the end portion of the instrument panel 4, The skin material 4e is configured to be prevented from peeling off.

  A finisher member 14 made of a resin material having semi-translucency is provided on the upper surface side of the plate-like light guide 10a.

  The finisher member 14 is integrally formed so that a lower end flange portion 14a that is tightly attached to the end portion 11a of the cover member 11 has a substantially L-shaped cross section from the lower edge portion toward the front of the vehicle. It is extended and formed.

  And the upper end part 14b upper surface side is contacting the surface material 4e surface among this finisher member 14, The said finisher opening part 4a is with the illumination surface part 10d as an illumination surface part of the said rod-shaped light guide 10a. The finisher member 14 is configured to be closed.

  Furthermore, in this embodiment, the illumination light from the LED light emitter 8 emitted from the outer peripheral surface 9a of the rod-shaped light guide 9 is diffused by diffuse reflection. The light guide length D between the light incident surface portion 10b and the illumination surface portion 10d is determined in the vehicle width direction according to the extended length X of the rod-shaped light guide 9 at the position where the light incident portion faces. It exhibits a quadratic curve shape so that it is gradually reduced.

  In this embodiment, when illumination light enters the rod-shaped light guide 10 from the LED light emitter 8, the light is guided along the longitudinal direction in the rod-shaped light guide 10 in FIG. As shown in FIG. 4, the light amount is reduced as a quadratic curve function according to the distance length X from the light source.

  For this reason, as shown in FIG. 5, when the light incident surface portion 10b has a linear shape, the light guide length D between the light incident surface portion 10b and the illumination surface portion 10d (the extension of the rod-shaped light guide 9). The length of the plate-shaped light guide 10a in the direction orthogonal to the installation direction) is extended to the illumination light emission portion guided in the vehicle width direction (longitudinal extension direction of the rod-shaped light guide 9). Accordingly, it is configured to gradually decrease as a quadratic curve function.

  In this embodiment, the light guide length D from the light incident surface portion 10b gradually decreases like a quadratic curve function according to the square of the extended length position X of the rod-shaped light guide 9. The light guide dimension L passing through the plate-like light guide 10a up to the illumination surface portion 10d is continuously curved so that the illumination light is evenly distributed in any portion of the illumination surface portion 10d. It is formed in a curved shape.

  For this reason, the occupant in the passenger compartment 2 is configured so that the amount of illumination light emitted from the illumination surface portion 10d to the vehicle interior space 2 is uniform at any location.

  In addition, in this embodiment, the rod-shaped light guide 9 has the same outer diameter size as a round rod, extends along the vehicle width direction, and enters the plate-shaped light guide 10. The surface portion 10 b is extended along the longitudinal direction of the rod-shaped light guide 9.

  Further, the illumination surface portion 10d has a vehicle vertical direction thickness dimension that is uniform in the vehicle width direction, from one end surface 9a in the extending direction of the rod-shaped light guide 9, and from the one LED light emitter 8. Even when the illumination light to be irradiated is guided, the thickness in the vehicle vertical direction is configured to be uniform so that the illumination surface portion 10d is uniformly distributed at any location in the vehicle width direction. ing.

  Furthermore, in this embodiment, as shown in FIG. 2, the illumination surface portion 10d is curved in accordance with the surface shape on the passenger seat side of the instrument panel 4 by interior molding in the passenger compartment 2. However, the light guide length D between the light incident surface portion 10b and the illumination surface portion 10d is gradually reduced as a quadratic curve function depending on the extended length position X of the rod-shaped light guide 9. The curved shape of the writing light surface portion 10b is set to be a straight line or a curve, and the illumination light on the illumination surface portion 10d is configured to be uniform.

  Thus, the light guide length D in the plate-like light guide 10a always changes gradually according to the length dimension X in which the illumination light passes through the rod-like light guide 9 in a quadratic curve function. Thus, the surface shapes of the light incident surface portion 10b and the illumination surface portion 10d can be distributed substantially evenly in each portion with respect to the surface shapes of the light incident surface portion 10b and the illumination surface portion 10d. Thus, it is formed by a continuous straight line or curve.

  In particular, in this embodiment, by forming the light incident surface portion 10b with a curved shape, a skin on the side of the passenger compartment side on the passenger seat side of the instrument panel 4 on which the plate-like light guide 10a is disposed. The position and the position of the illumination surface portion 10d on the vehicle interior side are adapted to be flush with each other.

  Next, the effect of the vehicle interior lighting device according to this embodiment will be described.

  In the vehicle interior lighting device of this embodiment, when the LED light emitter 8 of the illumination device 7 is turned on, the irradiated illumination light of the LED light emitter 8 enters from the end face 9 a of the rod-shaped light guide 9. The light is guided through the rod-shaped light guide 9 in the direction of the opposite end face 9d along the longitudinal direction.

  The illumination light guided through the rod-shaped light guide 9 becomes attenuated illumination light in proportion to the square of the extending length X from the end surface 9a of the rod-shaped light guide 9, From the outer peripheral surface 9b provided with the illumination light deriving means, the light is emitted in the width direction toward the light incident surface portion 10b of the plate-like light guide 10a.

  Here, since the LED light emitter 8 is provided close to the end surface 9a, the length from the light source to the light incident surface portion 10b can be set to X.

  The light quantity of the illumination light incident on the vehicle interior side light guide member 10 is proportional to the square of the extended length X of the rod-shaped light guide 9 according to the position of the outer peripheral surface 9b to be emitted. As shown in the figure, a quadratic curve is drawn and decreases.

  In this embodiment, the passing distance of the illumination light of the LED light emitter 8 in the transparent resin material is the length dimension from the outer peripheral surface 9b of the rod-shaped light guide 9 to the position X emitted from each position X. It is the dimension which added the light guide length D in the said plate-shaped light guide 10a from each light-incidence surface 10b which opposes and corresponds to the illumination surface part 10d.

  For this reason, as the illumination light emitted from the outer peripheral surface 9b of the rod-shaped light guide 9 goes away according to the position in the longitudinal direction from the LED light emitter 8, the light amount is reduced, and the plate light guide Illumination light re-entered from the light incident surface portion 10b provided on one end face of 10a is also reduced in accordance with the longitudinal position X from the LED light emitter 8 (end face 9a).

  Therefore, the inside light guide length D to the illumination surface portion 10d located on the opposite side of the light incident surface portion 10b of the plate-like light guide 10a is a secondary according to the longitudinal position X from the LED light emitter 8. By drawing and decreasing the curve, the light guide length dimension D gradually decreases as the distance from the LED light emitter 8 increases, and the light is emitted at any location in the longitudinal direction (vehicle width direction) of the illumination surface portion 10d. The amount of illumination light emitted can be made uniform.

  Moreover, in this embodiment, the light guide length D from the light incident surface 10b is reduced so as to draw a quadratic curve according to the position X in the extending direction of the rod-shaped light guide 9. The surface portion 10d is formed so that the amount of illumination light from the LED light emitter 8 that reaches the surface portion 10d is smoothly reduced and uniform so as to draw a quadratic curve, and has a curved shape without a step.

  For this reason, the light quantity of the illumination light radiated into the passenger compartment 2 is continuous in the vehicle width direction in the plate-like light guide 10a, is almost uniform at any position, and a plurality of conventional groove portions As in the case of a transparent cover body having such a level difference, continuous illumination light can be obtained without generating a discontinuous portion of contrast due to reflection.

  Therefore, it is not necessary to separately form a plurality of discontinuous groove portions, belt-like reflection portions, or the like in the lens member or the reflection member as in the prior art, and processing is easy.

  Furthermore, in order to obtain uniform illumination light, it is not necessary to interpose a diffusing member such as a diffusing plate in the optical path between the LED light emitter 8 and the illuminating surface portion 10d. This diffusion member can be omitted or reduced, and the number of parts can be reduced.

  Moreover, in this embodiment, as shown in FIG. 2, even if the illumination surface portion 10 d is curved in accordance with the passenger seat side surface shape of the instrument panel 4, the light incident surface portion 10 b and the illumination surface portion The light guide length D between 10d and 10d is reduced by drawing a quadratic curve as the distance from the LED light emitter 8 increases according to the extended length position X of the rod-shaped light guide 9. Even if a variety of shapes is given, uneven light can be eliminated.

  In this way, the illumination surface portion 10d can obtain continuous illumination light with uniform illuminance at the time of lighting, so that the appearance quality at the time of lighting is good.

  Even when the light is turned off, the curved shape of the light incident surface portion 10b shown in FIG. 1 is gradually changed in the vehicle width direction.

  For this reason, according to the passenger seat side surface shape of the instrument panel 4, the said illumination surface part 10d can be curved.

  Therefore, it is possible to match the skin shape of the passenger side surface of the instrument panel 4 and the outer surface shape of the illumination surface portion 10d so as to be substantially flush with each other so as to reduce unevenness, and to achieve a good appearance. In addition to obtaining quality, the degree of freedom of modeling around the instrument panel 4 can be increased.

  In addition, in this embodiment, the light guide length D from the light incident surface portion 10b to the illumination surface portion 10d is gradually reduced in accordance with the extended length position X of the rod-shaped light guide 9, so that the illumination A curved surface continuously curved so that the light guide length D passing through the plate-like light guide 10a up to the surface portion 10d can distribute the illumination light evenly in any portion of the illumination surface portion 10d. Not only the shape of the illumination surface portion 10d having a shape but also the shape of the light incident surface portion 10b is formed in a curved shape, and the cross-sectional shape is determined from the light source according to the extended length position X of the rod-shaped light guide 9. Is reduced to draw a quadratic curve.

  Therefore, as shown in FIG. 2, the LED light emitter 8 is provided only on the one end face 9 a side on the outer side in the vehicle width direction by effectively using the space space of the passenger seat side layout of the instrument panel 4. Even in this case, the amount of illumination light emitted from the illumination surface portion 10d to the vehicle interior space 2 is visually recognized as being uniform at any location.

  In addition, in this embodiment, since the rod-shaped light guide 9 has the same outer diameter and extends in the longitudinal direction, the one LED light emission from one end surface 9a in the extending direction. Even when the illumination light from the body 8 is guided, the amount of illumination light irradiated in the width direction is uniformly distributed in the longitudinal direction of the illumination surface portion 10d, and the same thickness in the vertical direction of the vehicle appears. Continuous illumination light can be obtained.

  Therefore, the appearance quality can be improved without requiring a long and thin expensive light source such as a fluorescent lamp tube.

  Furthermore, in this embodiment, as shown in FIG. 2, the illumination surface portion 10d is curved in accordance with the surface shape on the passenger seat side of the instrument panel 4 by interior molding in the passenger compartment 2. However, the light guide length D between the light incident surface portion 10b and the illumination surface portion 10d is reduced so as to draw a quadratic curve depending on the extended length position X of the rod-shaped light guide 9. You only have to set it.

  Therefore, when the curved shape of the light incident surface portion 10b is close to a straight line or is linear as schematically shown in FIG. The illumination light incident from the light incident surface portion 10b can maintain a substantially constant distance with respect to the surface 9b, and the amount of light L attenuated by the separation from the outer peripheral surface 9b of the rod-shaped light guide 9 can be made substantially constant.

  Therefore, the light guide length D, which is the light guide dimension in the plate-shaped light guide 10a, always corresponds to the length dimension X through which the illumination light passes through the rod-shaped light guide 9 so as to draw a quadratic curve. Thus, even when the curved surface shapes of the light incident surface portion 10b and the illumination surface portion 10d are set, the light incident surface portion 10b is placed on the outer peripheral surface 9b of the rod-shaped light guide 9. Thus, by forming along the proximity position, it is possible to easily set a shape that evenly distributes the amount of light emitted from the illumination surface portion 10d to the vehicle interior space 2.

  Therefore, also in this respect, compared to the conventional case where a plurality of discontinuous groove portions, a band-like reflection portion, and the like are formed, it can be simply configured with a small number of parts, and an increase in manufacturing cost can be suppressed.

  In addition, there is no risk that the amount of light is reduced as compared with a conventional diffusing member or the like interposed in the optical path, and at any location in the longitudinal direction of the illuminating surface portion 10d to which curved modeling is given while maintaining high brightness. The illumination light can be emitted uniformly, and the appearance quality can be improved.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the said embodiment, according to the extending length position X of the rod-shaped light guide 9, between the said light-incidence surface part 10b and the said illumination surface part 10d so that it may reduce gradually as a function which draws a quadratic curve. The light guide length D between them is set, but not limited to this. For example, the light guide length D decreases according to the difference of the light quantity attenuation rate depending on the material of the rod-shaped light guide 9, for example, according to the natural logarithm base. A curve obtained by any attenuation function that attenuates illumination light as a function or a function that draws an exponential decay curve considering the three-dimensional diffusion of light or a function that draws a cubic curve may be used. A curve shape that gradually changes the light guide length D from the light surface portion 10b to the illumination surface portion 10d according to the extended length position X of the rod-shaped light guide 9 can be used to distribute the light amount evenly. Etc., such as the rod-shaped light guide 9 and the plate-shaped light guide 10a. Shaped members 10, the quantity and material, but is not particularly limited.

  Further, as shown in FIG. 5, the light incident surface portion 10b may have a linear shape or other curved shape along the longitudinal direction of the rod-shaped light guide 9, and the shape of the light incident surface portion 10b is particularly It is not limited.

  In this case, the shape of the passenger seat side rear side surface portion 4a of the instrument panel 4 on which the vehicle interior side light guide member 10 is disposed can be freely shaped according to the vehicle interior design.

  In addition, the light guide dimension length D from the light incident surface portion 10b to the illumination surface portion 10d is not limited to that in the embodiment, and the illumination light of the illumination surface portion 10d is one at any location. It may be adjusted by changing the curve or linear shape of at least one or both of the illumination surface portion 10d and the light incident surface portion 10b so as to emit light.

  Furthermore, in the said embodiment, although the LED light-emitting body 8 is used as a light source, it is not restricted to this in particular, You may use other light-emitting means, such as a bulb | bulb etc., point light sources, a phosphorescent member, etc. As long as the light source can enter from the end face 9a of the rod-shaped light guide 9, any shape, quantity and light source of the light emitting means may be used.

It is a disassembled perspective view of the principal part in the vehicle interior lighting device of the embodiment of the present invention. It is a perspective view explaining the composition of the instrument panel seen from the vehicle interior side with the vehicle interior lighting device of an embodiment. It is sectional drawing explaining the structure of the principal part in the vehicle interior lighting apparatus of embodiment in the position along the AA line in FIG. It is a graph which shows the relationship between the distance X from the light source which passes the general light guide, and the brightness | luminance L of illumination light with the vehicle interior lighting apparatus of embodiment. It is the typical top view used in order to explain the process of setting up the shape of a tabular light guide member in the car interior lighting device of an embodiment.

Explanation of symbols

2 Car interior space 7 Illumination device 8 LED light emitter (light source)
9 Bar-shaped light guide 9a End surface 9b Outer peripheral surface 9d Opposite side end surface 10 Car interior side light guide member (plate-shaped light guide member)
10a Plate-shaped light guide 10b Light incident surface portion 10d Illumination surface portion

Claims (2)

Irradiation light from the light source is incident from the end face in the longitudinal direction and guided toward the opposite end face, and emitted from the outer peripheral surface, and along the outer peripheral surface in the vicinity of the rod-shaped light guide A light incident surface portion that extends and emits re-entered illumination light, and guides the re-entered illumination light in the width direction of the rod-shaped light guide to illuminate the vehicle interior side space. A vehicle interior lighting device having a plate-shaped light guide body having an illumination surface portion to perform,
The illumination surface portion is set so that the light guide length inside the plate-shaped light guide from the light incident surface portion to the illumination surface portion decreases in a curved manner as the distance from the light source increases. Car interior lighting device.   The vehicle interior lighting device according to claim 1, wherein the curve is a quadratic curve.

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