JP6057080B2 - Light guide and lighting device - Google Patents

Description

  The present invention relates to a light guide and a lighting device, and more particularly to a substantially flat plate-like light guide and a lighting device including the light guide.

  In Patent Document 1, a light source is arranged on the back side of a rectangular flat light guide, a pyramidal recess is formed on the surface of the light guide located immediately above the light source, and the emitted light of the light source is transmitted by the pyramidal recess. A planar illumination device is disclosed that diffuses and guides light in the entire surface direction of a light guide by reflecting and refracting, and emits the entire surface of the light guide as an output surface.

JP 2012-43617 A

2. Description of the Related Art Conventionally, a technique (illumination with illumination) is known in which an illumination device is attached to an automobile ornament to form an illumination. It is conceivable to use the planar illumination device of Patent Document 1 for this technology.
However, when the planar illumination device of Patent Document 1 is attached to a horizontally long and substantially parallelogram-shaped ornament, it is difficult to diffuse and guide the light emitted from the light source to every corner of the substantially parallelogram. There's a problem.

Therefore, it is conceivable to arrange two or more light sources and pyramidal recesses in the horizontal direction.
However, there is a possibility that the light reflected and refracted by one of the pyramidal recesses may be guided to the other pyramidal recesses and reflected and refracted, and the emitted light from the exit surface of the light guide There is a problem in that the light emission efficiency is reduced due to a decrease, and the emission surface does not emit light uniformly, and the light emission intensity is uneven.

The present invention has been made to solve the above problems, and has the following objects.
(1) Providing a light guide body that can prevent emission light from decreasing from the light exit surface of the light guide body and increase the light emission efficiency, and can reduce unevenness in light emission intensity by uniformly emitting light on the light output surface. To do.
(2) Provided is an illuminating device including the light guide of (1).

  As a result of intensive studies in order to solve the above-mentioned problems, the present inventors have arrived at each aspect of the present invention as follows.

<First aspect>
The first aspect is
It is a substantially flat plate-shaped light guide,
A plurality of linear groove-shaped recesses extending in the short direction of the light guide are formed on the surface side of the light guide,
Each of the plurality of recesses is arranged non-parallel along the longitudinal direction of the light guide,
Of the plurality of recesses, the perpendicular line passing through the center point of any recess in plan view does not intersect with the other recesses, but is farther from the end of the light guide located in the extending direction of the other recesses. It passes through the end of the light body.

  In the first aspect, light entering the light guide with the back surface of the light guide as the entrance surface is reflected and refracted with the inner wall surface of the plurality of recesses as the reflection surface, and diffuses through the light guide in the entire surface direction. Then, the light is guided and emitted with the entire surface of the light guide as the exit surface.

Here, each of the plurality of recesses is arranged in a non-parallel manner along the longitudinal direction of the light guide, and among the plurality of recesses, a perpendicular passing through the center point in plan view of an arbitrary recess is another recess. Do not cross.
For this reason, most of the light reflected and refracted by any of the plurality of recesses is guided to other recesses and is not easily reflected or refracted. It is possible to suppress the light emission efficiency from being reduced and decrease, and to prevent the emission surface from emitting light uniformly and causing unevenness in the light emission intensity.

And the perpendicular which passes along the center point in the planar view of arbitrary recessed parts among several recessed parts passes through the edge part of the light guide far from the edge part of the light guide body located in the extending | stretching direction of another recessed part. Therefore, the light is diffused and spread to every corner of the substantially flat plate-shaped light guide, and the emission surface can emit light more uniformly, thereby further reducing the unevenness of the light emission intensity.
Therefore, according to the first aspect, it is possible to prevent emission light from decreasing from the exit surface of the light guide and increase the light emission efficiency, and to reduce unevenness in the light emission intensity by causing the exit surface to emit light uniformly. Possible light guides can be realized.

<Second aspect>
In a second aspect, in the first aspect, the surface of the light guide is substantially rectangular.
In the second aspect, even if the light guide has a long and substantially quadrangular shape (for example, a horizontally long substantially parallelogram, trapezoid, or rhombus), the above-described operation and effect of the first aspect can be reliably obtained.

<Third aspect>
The third aspect is
A light guide of the first aspect or the second aspect;
A lighting device comprising a plurality of light sources arranged on the back side of the light guide,
The central axes of the plurality of light sources respectively pass through the center points of the plurality of recesses.

  In the third aspect, since the center point of the concave portion is located immediately above the light source, the emitted light of the light source is efficiently reflected by the concave portion after entering the light guide body with the back surface of the light guide body as the incident surface. Since it is refracted, it is possible to realize an illuminating device that can reliably obtain the operation and effect of the first aspect or the second aspect.

<Fourth aspect>
The fourth aspect is the third aspect,
A decorative member disposed on the surface side of the light guide;
The decorative member includes a light-shielding portion, and the plurality of concave portions are covered with the light-shielding portion of the decorative member.

  In the fourth aspect, since the concave portion and the light source located immediately below it are covered by the light-shielding portion of the decorative member, it is possible to prevent the concave portion and the light source from being seen from the outside of the lighting device. The design can be enhanced by hiding the light source.

FIG. 1A is a top view of a lighting apparatus 10 according to a first embodiment that embodies the present invention. FIG. 1B is an end view of a longitudinal section of the lighting device 10, and is an end view taken along the line XX in FIG. FIG. 2A is a top view of the illumination device 10 according to the first embodiment (the same drawing as FIG. 1A). FIG. 2B is a top view of the light guide 60 of the lighting device 10. The end elevation of the important section longitudinal section of lighting installation 10 of a 1st embodiment. FIG. 4A is a top view of the illumination device 100 according to the second embodiment that embodies the present invention. FIG. 4B is an end view of a longitudinal section of a main part of the lighting device 100, and is an end view taken along the line XX in FIG.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. In each embodiment, the same constituent members and constituent elements are denoted by the same reference numerals, and redundant description of the same contents is omitted.
Moreover, in each drawing, in order to make the explanation easy to understand, the dimensional shape and arrangement location of the constituent members of each embodiment are schematically illustrated in an exaggerated manner, and the dimensional shape and arrangement location of each constituent member are the real thing. May not always match.

<First Embodiment>
As shown in FIGS. 1 to 3, the illumination device 10 according to the first embodiment includes a garnish 20 (insertion holes 21 to 23), a lens 40 (a body portion 41, convex portions 42 to 44, a concave portion 45), and a sheet material 50. , Light guide 60 (recesses 61 and 62, inclined surface 63, white paint layer 64, black paint layer 65), housing 70 (accommodation recess 71, connection part 72), light emitting members 81 and 82 (LED 83, wiring board 84). Etc., and used as an ornament with automobile illumination.
By the way, ornament refers to all decorative items such as emblems attached to automobiles and automobile manufacturer logos.

The corresponding portion of the illuminating device 10 in the garnish 20 has a substantially flat plate shape, and includes insertion holes 21 to 23 that are formed to penetrate in the thickness direction. Is configured.
The garnish 20 is integrally formed by injection molding of a synthetic resin material having light shielding properties, and is attached and fixed to a vehicle as an exterior or interior of an automobile.

By the way, garnish refers to all parts that decorate automobiles.For example, in exterior, there are side sill garnish that protects the lower part of the vehicle from scratches caused by jumping pebbles, etc., and back door garnish that can be attached to the back door. Then there are center garnishes around the shift panel.
Also, the decorative character code “IIV” is merely an example, and this character code has no special meaning.

The lens 40 includes a main body 41 that has a substantially flat parallelogram shape in a plan view, and convex portions 42 to 44 that are erected so as to protrude in the thickness direction from the surface side of the main body 41. The convex portions 42 to 44 constitute a decorative character code “IIV”.
The lens 40 is integrally formed by injection molding of a colored transparent synthetic resin material (for example, acrylic resin) colored in an appropriate color (for example, blue).
Moreover, the front-end | tip part of the convex parts 42-44 forms a flat top surface, and is formed so that it may be located on substantially the same plane.
As shown in FIG. 3, a concave portion 45 that is slightly recessed is formed on the back surface side of the lens 40.

  The sheet material 50 has a sheet shape of the same plane shape that is slightly smaller than the main body portion 41 of the lens 40, and is formed of a transparent synthetic resin material. Various processing for decoration (for example, coloring processing, half mirror processing) , Pattern printing, etc.).

The light guide 60 has a substantially flat plate shape that is the same plane as the sheet material 50, and is integrally formed by injection molding of a transparent synthetic resin material (for example, an acrylic resin, a polycarbonate resin, or the like).
Further, on the surface side of the light guide 60, concave portions 61 and 62 having a substantially triangular shape with a vertical angle of 90 ° and linear groove shapes are formed.

As shown in FIG. 3, an inclined surface (C surface) 63 that is chamfered at 45 ° is formed on the entire circumference of the corner portion on the back surface side of the light guide 60.
Further, as shown in FIG. 3, the back surface of the light guide 60 excluding the side end surface and the inclined surface 63 and the portion directly under the concave portions 61 and 62 of the light guide 60 (incident area of the emitted light of the LED 83) is white. A white paint layer 64 to which a paint is applied is formed, and a black paint layer 65 to which a black paint is applied is formed on the surface of the white paint layer 64.

The housing 70 has a box shape with an upper surface opened, and includes a housing recess 71 formed in the bottom surface portion of the housing 70 and a connection portion 72 that connects the outer peripheral edge of the housing 70 and the housing recess 71. And is integrally formed by injection molding of a synthetic resin material.
Further, the upper end surface of the outer peripheral edge portion of the housing 70 is bonded and fixed to the back surface side of the outer peripheral edge portion of the main body 41 of the lens 40 so as to be in a liquid-tight state.
The housing 70 is fixedly attached to the back side of the garnish 20.

As a method for joining and fixing the housing 70 and the lens 40, any method (for example, screwing, bonding, ultrasonic welding, etc.) may be used as long as a good liquid-tight state can be obtained.
In addition, as a method for fixing the housing 70 and the garnish 20, any method (for example, a method using a mounting bracket, screwing, adhesion, or the like) may be used as long as a secure fixing state can be obtained.

The light emitting members 81 and 82 having the same configuration include an LED (Light Emitting Diode) 83 and a wiring board 84 on which the LED 83 is mounted.
The optical axes that are the central axes of the LEDs 83 of the light emitting members 81 and 82 are arranged so as to pass through the centers of the concave portions 61 and 62 of the light guide 60 in plan view, respectively.
The LED 83 may be replaced with any light source (for example, a semiconductor light emitting element such as an EL (Electro Luminescence) element, a light bulb, etc.).

[How to assemble lighting device 10]
To assemble the lighting device 10, first, the light emitting members 81, 82 are accommodated in the housing recesses 71 of the housing 70 and fixed so that the LEDs 83 of the light emitting members 81, 82 face the opening side of the housing 70.
Then, a connector (not shown) formed on the housing 70 and a connection terminal (not shown) of the light emitting members 81 and 82 are connected by a connection cable (not shown) disposed in the housing recess 71.

Next, the light guide 60 is accommodated in the housing 70 so that the concave portions 61 and 62 of the light guide 60 face outward, and the back surface side of the outer peripheral edge of the light guide 60 is connected to the connection portion 72 of the housing 70. It is made to contact with the inner wall surface.
Subsequently, the sheet material 50 is attached onto the surface of the light guide 60, and the light guide 60 and the sheet material 50 having the same size and shape in plan view are overlapped without misalignment.

Then, the lens 40 is attached to the opening side of the housing 70 so that the convex portions 42 to 44 of the lens 40 face outward, and the upper end surface of the outer peripheral edge portion of the housing 70 and the outer side of the main body portion 41 of the lens 40. Joining and fixing the back surface side of the peripheral edge.
Then, the sheet material 50 and the light guide 60 are sandwiched and fixed between the back surface side of the main body portion 41 of the lens 40 and the inner wall surface of the connection portion 72 of the housing 70. The light guide 60 is positioned at the set position.
As a result, the lens 40, the sheet material 50, the light guide 60, and the housing 70 are integrated.

When the housing 70 is attached and fixed to the garnish 20 with the convex portions 42 to 44 of the lens 40 inserted through the insertion holes 21 to 23 of the garnish 20 from the back side of the garnish 20, the lighting device 10 is fixed. The assembly is completed as an integrated object.
Here, after smooth insertion of the convex portions 42 to 44 with respect to the insertion holes 21 to 23, the insertion holes 21 to 23 and the convex portions are made so that the gap between the insertion holes 21 to 23 and the convex portions 42 to 44 becomes small. The dimensions of the parts 42 to 44 are set.

  Thereafter, a connector (not shown) formed on the housing 70 is connected to a vehicle wire harness (not shown), and direct current power is supplied from the in-vehicle battery (not shown) to the lighting device 10 via the wire harness to emit light. The LEDs 83 of the members 81 and 82 are caused to emit light.

[Operation of Lighting Device 10]
The light emitted from the LEDs 83 of the light emitting members 81 and 82 is incident on the light guide 60 with the back surface of the light guide 60 as the incident surface, and is reflected and refracted with the inner wall surfaces of the recesses 61 and 62 of the light guide 60 as the reflecting surfaces. Then, the light guide body 60 is diffused and guided in the entire surface direction, and the entire surface of the light guide body 60 is emitted as the exit surface.

The light emitted from the light guide 60 enters the lens 40 with the back surface of the lens 40 as the incident surface, and is emitted from the top surfaces (tip portions) of the convex portions 42 to 44 of the lens 40 exposed from the garnish 20. .
As a result, the character code “IIV” formed by the convex portions 42 to 44 emits light, and the character code can be viewed well from the outside of the illumination device 10.

[Operations and effects of the first embodiment]
According to the first embodiment, the following actions and effects can be obtained.

  [1] The light guide 60 has a substantially flat plate shape (substantially flat plate shape) with a horizontally long parallelogram in a plan view, and has a straight groove shape extending in the short direction of the light guide 60 and a cross section of 90 ° apex angle. The substantially triangular recesses 61 and 62 are formed on the surface side of the light guide 60.

The two concave portions 61 and 62 are arranged in parallel with each other in a “C” shape along the longitudinal direction of the light guide 60.
Further, as shown in FIG. 2B, among the two recesses 61, 62, the perpendiculars V1, V2 passing through the center points O1, O2 in the plan view of one recess 61, 62 are the other recess 61, 62. Does not cross 62.
Therefore, since most of the light reflected and refracted by one of the two concave portions 61 and 62 is guided to the other concave portion 61 and 62 and is difficult to be reflected and refracted, the light is guided. The emission light from the emission surface of the body 60 can be prevented from decreasing and the light emission efficiency can be suppressed, and the emission surface can be prevented from emitting light uniformly and unevenness in emission intensity can be suppressed.

Further, as shown in FIG. 2B, the perpendicular line passing through the center points O1 and O2 in the plan view of one of the two recesses 61 and 62 is a light guide located in the extending direction of the other recess. Since the light passes through the end portions 60a and 60b of the light guide body 60 farther from the end portion of the body 60, light is diffused to every corner up to the end portions 60a and 60b of the horizontally elongated parallelogram light guide body 60 in plan view. Thus, the emission surface can be made to emit light more uniformly, and the unevenness of the emission intensity can be further reduced.
Therefore, according to the first embodiment, it is possible to prevent emission light from decreasing from the exit surface of the light guide 60 and increase the light emission efficiency, and to uniformly emit light by emitting light uniformly from the exit surface. A light guide 60 that can be reduced can be realized.

[2] The light guide 60 is a substantially flat parallelepipedal substantially flat plate shape in a plan view, but is a substantially quadrangular light guide body 60 (for example, a horizontally long trapezoid or a rhombus) in a plan view. However, the operation and effect of [1] can be obtained with certainty.
The planar shapes of the lens 40 and the sheet material 50 may be changed in accordance with the planar shape of the light guide 60.

  [3] The lighting device 10 includes the light guide 60 and the LEDs 83 of the light emitting members 81 and 82 arranged on the back surface side of the light guide 60, and the central axes of the LEDs 83 of the light emitting members 81 and 82 are respectively guided. It passes through the center points O1, O2 of the concave portions 61, 62 of the light body 60.

  That is, since the center points O1 and O2 of the recesses 61 and 62 are located immediately above the LED 83 of the light emitting members 81 and 82, the emitted light of the LED 83 enters the light guide 60 with the back surface of the light guide 60 as the incident surface. Since the light is efficiently reflected and refracted by the concave portions 61 and 62 after being incident, the illumination device 10 can be realized in which the operations and effects of [1] and [2] can be obtained with certainty.

[4] The illumination device 10 includes the lens 40 disposed on the surface side of the light guide 60 and the garnish 20 disposed on the surface side of the lens 40, and the recesses 61 and 62 of the light guide 60 are light-shielding. The garnish 20 is disposed directly under the garnish 20 and is covered with the garnish 20.
That is, the lens 40 and the garnish 20 constitute a decorative member disposed on the surface side of the light guide 60, and the garnish 20 that is a portion having a light shielding property in the decorative member causes the concave portions 61 and 62 of the light guide 60 to be formed. Is covered.

  Therefore, in the illuminating device 10, the recesses 61, 62 of the light guide 60 and the LEDs 83 of the light emitting members 81, 82 located immediately below the light guide 60 are covered with the garnish 20, so In addition, it is possible to prevent the LED 83 from being seen, and the concavities 61 and 62 and the LED 83 can be hidden to improve the design.

[5] The lens 40 includes a plate-shaped main body 41 and convex portions 42 to 44 protruding in the thickness direction from the surface side of the main body 41.
The garnish 20 has insertion holes 21 to 23 that are formed through in the thickness direction.

And in the illuminating device 10, the light guide 60 is arrange | positioned at the back surface side of the lens 40, and the convex parts 42-44 of the lens 40 are penetrated by the insertion holes 21-23 from the back surface side of the garnish 20, and are the surface side of the garnish 20 Protruding (exposed).
Therefore, in the illuminating device 10, the planar shape of the lens 40 can be made substantially the same as the planar shape of the light guide 60, and the convex portions 42 to 44 can be arranged in the longitudinal direction of the lens 40. ] Can be further enhanced.

  [6] In the illuminating device 10, since the convex portions 42 to 44 of the lens 40 constitute the character code “IIV”, the design of the convex portions 42 to 44 can be further improved.

[7] An inclined surface (C surface) 63 that is chamfered at 45 ° is formed on the entire circumference of the corner portion on the back surface side of the light guide 60.
Here, when the inclined surface 63 is not provided and the angle formed between the side end surface and the back surface of the light guide 60 is 90 °, the light guided in the light guide 60 and reflected by the side end surface is reflected. The light is diffused over a wide range in the vicinity of the corner portion on the surface side of the light guide 60, and the light emission intensity in that range is increased, so that the light emission intensity on the exit surface (surface) of the light guide 60 is uneven.

Therefore, by forming the inclined surface 63 on the light guide 60, the light guided in the light guide 60 and reflected by the side end face can be converted into a narrow range M near the corner portion on the surface side of the light guide 60. Therefore, it is possible to reduce the unevenness that occurs in the light emission intensity of the exit surface (surface) of the light guide 60.
The angle of the inclined surface 63 is not limited to 45 °, and may be set to an appropriate value based on experiments, simulations, or the like according to the size and shape of the light guide 60.

Further, when the inclined surface 63 is not provided and the angle formed between the side end surface and the back surface of the light guide 60 is 90 °, the white coating layer 64 and the black coating layer are formed at the corners on the back surface side of the light guide 60. Since 65 is difficult to apply, the corner portion on the back surface side of the light guide 60 may be exposed from the coating layers 64 and 65.
However, if the inclined surface 63 is formed in the corner portion on the back surface side of the light guide body 60, the coating layers 64 and 65 can be easily applied to the corner portion on the back surface side of the light guide body 60. It is possible to prevent the corner portion on the back surface side of the light body 60 from being exposed from the coating layers 64 and 65.

[8] White coated with white paint on the back surface of the light guide 60 except the side end surface and the inclined surface 63 and the portions directly under the concave portions 61 and 62 of the light guide 60 (incident area of the emitted light of the LED 83). A coating layer 64 is formed.
Therefore, the radiated light of the LED 83 of the light emitting members 81 and 82 is guided through the light guide 60, and the side end surface and the inclined surface 63 of the light guide 60 and the portions directly below the recesses 61 and 62 of the light guide 60 are detected. When reaching the back surface, the radiated light is reflected by the white coating layer 64 and then emitted from the exit surface (front surface) of the light guide 60.

  That is, the white paint layer 64 blocks the radiated light of the LED 83 from leaking to the outside from the back surface except the side end surface and the inclined surface 63 of the light guide 60 and the portions directly below the recesses 61 and 62 of the light guide 60. For this reason, it is possible to prevent the decrease of the emitted light from the exit surface of the light guide 60 and further increase the light emission efficiency.

[9] When the radiated light of the LED 83 is guided through the light guide 60 and reaches the white paint layer 64, most of the light is reflected by the white paint layer 64, but a small amount of light passes through the white paint layer 64. To Penetrate.
Therefore, the light transmitted through the white coating layer 64 may leak out of the lighting device 10 through the lens 40 from the gap between the sheet material 50 and the housing 70, and the design of the lighting device 10 may be impaired.

  However, since the black paint layer 65 to which the black paint is applied is formed on the surface of the white paint layer 64, the light transmitted through the white paint layer 64 is absorbed and blocked by the black paint layer 65 to the outside. Since it does not leak, it can prevent that the designability of the illuminating device 10 is impaired.

[10] On the back surface side of the lens 40, a recessed portion 45 that is slightly recessed is formed.
Here, when the concave portion 45 is not provided and the back surface side of the lens 40 is flattened, the back surface side of the lens 40 and the sheet material 50 are in close contact with each other, and a Newton ring (interference fringe pattern) is generated in the close contact portion. The design of the lighting device 10 may be impaired.

  Therefore, the concave portion 45 is formed on the back surface side of the lens 40, and an air layer due to the air in the concave portion 45 is generated between the back surface side of the lens 40 and the sheet material 50, whereby the back surface side of the lens 40 and the sheet material 50. Since the Newton ring will not generate | occur | produce by inhibiting that it adhere | attaches, it can prevent that the designability of the illuminating device 10 is impaired.

Second Embodiment
As illustrated in FIG. 4, the illumination device 100 according to the second embodiment includes a garnish 20 (insertion holes 21 to 23), a light guide 120 (a main body 121, protrusions 122 to 124, recesses 125 and 126, and an inclined surface 127. , White coating layer 128, black coating layer 129), housing 70 (accommodating recess 71, connecting portion 72), light emitting members 81 and 82 (LED 83, wiring board 84), and the like, and used as an ornament with illumination of an automobile.

The illumination device 100 of the second embodiment differs from the illumination device 10 of the first embodiment in the following points.
[A] The sheet material 50 and the light guide 60 of the first embodiment are omitted.

[A] The lens 40 of the first embodiment is replaced with a light guide 120.
The light guide 120 includes a main body 121 that has a substantially flat plate shape having the same size as the lens 40 of the first embodiment, and a convex portion that protrudes from the surface of the main body 121 in the thickness direction. 122-124, and the recessed parts 125 and 126 of the same dimension shape as the recessed parts 61 and 62 of the light guide 60 of 1st Embodiment are provided.
The arrangement | positioning location in the planar view of the recessed parts 125 and 126 of the light guide 120 is the same as the recessed parts 61 and 62 of the light guide 60 (refer FIG. 1, FIG. 4).

[C] The convex portions 122 to 124 of the light guide 120 have the same size and shape as the convex portions 42 to 44 of the lens 40 of the first embodiment.
Like the lens 40 of the first embodiment, the light guide 120 is integrally formed by injection molding of a colored transparent synthetic resin material colored in an appropriate color.

  [D] The inner wall surface of the outer peripheral edge of the housing 70 is bonded and fixed to the side surface of the outer peripheral edge of the main body 121 of the light guide 120 so as to be in a liquid-tight state.

  [E] An inclined surface (C surface) 127 having a 45 ° chamfering process is formed on the entire circumference of the corner portion on the back surface side of the light guide 120.

  [F] White coated with white paint on the back surface of the light guide 120, except for the side end surface and the inclined surface 127 and the portions directly under the recesses 125 and 126 of the light guide 120 (incident area of the emitted light of the LED 83). A paint layer 128 is formed, and a black paint layer 129 coated with a black paint is formed on the surface of the white paint layer 128.

[Operation of Lighting Device 100]
The emitted light of the LED 83 of the light emitting members 81 and 82 is incident on the light guide 120 with the back surface of the light guide 120 as the incident surface, and is reflected and refracted with the inner wall surfaces of the recesses 125 and 126 of the light guide 120 as the reflecting surfaces. Then, the light guide 120 is diffused in the entire surface direction, guided, and emitted from the top surfaces (tip portions) of the convex portions 122 to 124 of the light guide 120 exposed from the garnish 20.
As a result, the character code “IIV” formed by the convex portions 122 to 124 emits light, and the character code can be viewed well from the outside of the illumination device 100.

[Operation and Effect of Second Embodiment]
According to the illumination device 100 of the second embodiment, in addition to the functions and effects of the first embodiment, the function of the lens 40 (decoration function) is imparted to the light guide 120, so that the light guide 60 Compared with the illumination device 10 of the first embodiment in which the lens 40 as a separate member is provided, the cost can be reduced.

<Another embodiment>
The present invention is not limited to the above-described embodiments, and may be embodied as follows. Even in this case, operations and effects equivalent to or higher than those of the above-described embodiments can be obtained.

[A] The number of the recesses 61, 62, 125, 126 of the light guides 60, 120 is not limited to two, and may be an appropriate number of three or more.
In that case, the light emitting members 81 and 82 may be provided for each concave portion of the light guide, as in the above embodiments.

  [B] The recesses 61, 62, 125, 126 of the light guides 60, 120 are not limited to a substantially triangular shape with a cross section of 90 °, and any operation and effect of [1] can be obtained. Various cross-sectional shapes may be used.

  [C] The garnish 20 includes a vehicle exterior member (for example, a side protection molding, a pillar exterior product, and an emblem), a vehicle interior member (for example, a door lining, an interior panel, and an emblem), and a vehicle outer plate (for example, a body , Doors, bumpers, etc.) may be replaced with any member inside or outside the vehicle.

  [D] The lens 40, the sheet material 50, and the light guides 60 and 120 are not limited to a substantially rectangular shape that is long in plan view, but may have any planar shape (for example, a long, generally elliptical shape). Good.

  [E] The lighting devices 10 and 100 are applied to the lighting of the vehicle, but the present invention is not limited to the vehicle, and may be applied to lighting of any article (for example, an electric product, furniture, etc.). In that case, the garnish 20 may be replaced with the exterior member of the article.

  The present invention is not limited to the description of each aspect and each embodiment. Various modifications are also included in the present invention as long as those skilled in the art can easily conceive without departing from the scope of the claims. The contents of publications and the like specified in the present specification are all incorporated by reference.

10, 100 ... Lighting device 20 ... Garnish (decorative member)
21-23 ... Insertion hole 40 of garnish 20 ... Lens (decorative member)
41... Main body portions 42 to 44 of lens 40. Convex portions 60 and 120 of lens 40. Light guides 61 and 62. Concave portion 121 of light guide body 60. Main body portions 122 to 124 of light guide body 120. , Convex portions 125, 126 of the light guide 120, housings 81, 82, light emitting members 83, LEDs (light sources).

Claims (4)

It is a substantially flat plate-shaped light guide,
A linear groove-like recess extending in the short direction of the light guide, and a plurality of triangular recesses are formed on the exit surface side of the light guide,
Each of the plurality of recesses is arranged non-parallel along the longitudinal direction of the light guide,
Among the plurality of recesses, Ri through the center point in the plan view of any recess, perpendicular line orthogonal to a direction extending in the longitudinal direction of the recess, do not cross the other recess, the extending direction of the other recess A light guide that passes through the outer edge of the light guide farther than the outer edge of the light guide located. Emitting surface of the light guide is substantially rectangular in plan view,
The light guide according to claim 1. The light guide according to claim 1 or 2,
A lighting device comprising a plurality of light sources arranged on the incident surface side of the light guide,
Each of the plurality of light sources has a central axis that passes through the center point of the plurality of recesses. A decorative member disposed on the surface side of the light guide,
The decorative member includes a light-shielding portion, and the plurality of recesses are covered with the light-shielding portion of the decorative member.
The lighting device according to claim 3.

Images