JP2018137127A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp for a vehicle capable of more uniform light emission. SOLUTION: A light guide body 5 has a first end surface 5a located on a side facing a light source 2, a protruding portion 50 protruding from the first end surface 5a toward the light source 2, and a first end surface. The second end surface 5b located on the opposite side of 5a and the outer and inner first and second side end surfaces 50b and 50c connecting the first end surface 5a and the tip surface 50a of the protruding portion 50 are formed. The first and second side end faces 50b and 50c are from the inside in the vehicle width direction with respect to the traveling direction of the light L incident from the tip surface 50a and guided toward the second end face 5b. The outer side is inclined toward the receding direction, and the first and second side end faces 50b and 50c refer the light L1 and L2 incident on the first and second side end faces 50b and 50c to the second. It is inclined at an angle that reflects toward the end surface 5b, and the distance between the first end surface 5a and the tip surface 50a of the first side end surface 50a is shorter than that of the second side end surface 50b. .. [Selection diagram] Fig. 4

Description

  The present invention relates to a vehicular lamp.

  Conventionally, as a vehicular lamp mounted on a vehicle, a combination of a light source such as a light emitting diode (LED) and a plate-like light guide (light guide plate) is known (for example, the following patent document). 1).

  In the vehicular lamp, a plurality of reflection cuts (reflection surfaces) provided on the light guide plate are provided while the light emitted from the light source enters the light guide plate from one end surface (incident surface) and is guided inside the light guide plate. ) Diffuses the light reflected by each reflection cut, and emits the light emitting surface (light emitting surface) provided on one surface (front surface) of the light guide substantially uniformly (surface light emission). ) Such a vehicular lamp is used, for example, for a tail lamp of a vehicle.

  By the way, the above-described LED has an advantage that it has a long life and low power consumption. For this reason, in recent vehicular lamps, the number of LEDs that employ LEDs as light sources is gradually increasing as the brightness and cost of LEDs increase.

  However, while LEDs have high directivity (straightness), they have the characteristic that light is difficult to diffuse. For this reason, in the vehicular lamp, when a plurality of LEDs are arranged side by side along the incident surface of the light guide plate, the portion corresponding to each position of the LED on the light emitting surface of the light guide plate shines stronger than the other portions. Brightness (light emission) unevenness is likely to occur.

  In a vehicular lamp, when such brightness unevenness occurs, the visibility and appearance deteriorate, so it is possible to reduce the brightness unevenness by providing a portion (diffusion surface) for diffusing light in the light guide plate. Has been done.

Japanese Patent No. 5753012

  By the way, in the vehicle lamp described above, a slant angle (also referred to as a camber angle depending on the tilting direction) on the emission surface (light emitting surface) of the light guide plate in accordance with the slant shape applied to the corner portion on the front end or rear end side of the vehicle. .) May be granted.

  For example, in a light guide plate provided with a camber angle, the emission surface (light emission surface) is directed toward the direction in which the outside recedes from the inside in the vehicle width direction with respect to the traveling direction of light emitted from the emission surface (light emission surface). ). Further, a plurality of LEDs are arranged in a staircase pattern in accordance with the shape of the light guide plate to which the camber angle is given.

  In the case where a plurality of LEDs are arranged side by side in a staircase pattern, a board on which a sheet metal is bent in a staircase pattern, a flexible board that can be bent in a staircase pattern, or the like is used.

  However, these substrates are very expensive compared to flat substrates. Moreover, since the assembly work of the stepped substrate is difficult by manual work, an automatic assembly facility is required. As a result, the manufacturing cost increases.

  Furthermore, depending on the slant shape applied to the corner portion on the front end or rear end side of the vehicle described above, the space for sufficiently arranging the number of LEDs necessary for uniform light emission and the length in the front-rear direction of the light guide plate It cannot be secured at the corner. As a result, the amount of light emitted from the emission surface (light emitting surface) is insufficient.

  The present invention has been proposed in view of such conventional circumstances, and an object thereof is to provide a vehicular lamp capable of more uniform light emission while avoiding an increase in size due to an increase in the number of light sources. To do.

In order to achieve the above object, the present invention provides the following means.
[1] a plurality of light sources;
A light guide for guiding the light emitted from the plurality of light sources,
The plurality of light sources are arranged side by side obliquely from the inner side to the outer side in the vehicle width direction according to the slant shape applied to the corner portion on the front end or rear end side of the vehicle,
The light guide includes a first end surface located on a side facing the plurality of light sources, a plurality of projecting portions projecting from the first end surface to face the plurality of light sources, and the first end surface. A second end face located on the opposite side of the first end face, a first side end face that connects the first end face and the tip end face of the projecting portion and is located outside in the vehicle width direction, and A second side end surface that is located on the inner side in the vehicle width direction and connects between the end surface of 1 and the tip end surface of the protrusion,
The first side end surface and the second side end surface are outside the inner side in the vehicle width direction with respect to the traveling direction of the light incident from the tip surface and guided toward the second end surface. Is inclined toward the direction of retreating,
The first side end face and the second side end face are inclined at an angle that reflects light incident on the first side end face and the second side end face toward the second end face,
The first side end face has a shorter distance between the first end face and the tip end face than the second side end face.
[2] The light guide body connects the first end surface and the second end surface, and is located on the outer side in the vehicle width direction, the first end surface, and the second end surface. A fourth end face that is connected to the end face and located inside the vehicle width direction;
The third end face and the fourth end face are inclined at an angle that reflects light incident on the third end face and the fourth end face toward the second end face,
The distance between the first end surface and the second end surface of the third end surface is shorter than that of the fourth end surface. Light fixture.
[3] The vehicular lamp according to [1] or 2, wherein the plurality of light sources are arranged side by side on the same surface.
[4] The vehicular lamp according to [3], wherein the plurality of light sources are mounted on a surface of the same substrate.
[5] Any one of the above [1] to [4], wherein the tip surface has a first diffusion portion that diffuses light incident on the tip surface in a direction in which the plurality of light sources are arranged. The vehicle lamp according to Item.
[6] Any one of [1] to [5], wherein the second end surface includes a second diffusion portion that diffuses light incident on the second end surface in the vehicle width direction. The vehicle lamp according to Item.
[7] The vehicular lamp according to [6], wherein the second diffusion portion has a light diffusion degree that increases from the inside toward the outside in the vehicle width direction.

  As described above, according to the present invention, it is possible to provide a vehicular lamp that can emit light more uniformly while avoiding an increase in size due to an increase in the number of light sources.

It is a top view which shows the structure of the vehicle lamp which concerns on one Embodiment of this invention. It is a side view which shows the structure of the vehicle lamp shown in FIG. It is a principal part front view which shows the structure of the vehicle lamp shown in FIG. It is sectional drawing by line segment AA of the vehicle lamp shown in FIG. It is sectional drawing by line segment BB of the vehicle lamp shown in FIG. It is sectional drawing by line segment CC of the vehicle lamp shown in FIG. It is a perspective view which shows another structural example of a 2nd light guide part. It is sectional drawing by line segment DD of the 2nd light guide part shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make each component easy to see, the scales of the dimensions may be different depending on the component, and the dimensional ratio of each component is not always the same as the actual. Absent.

  As one embodiment of the present invention, for example, a vehicle lamp 1 shown in FIGS. 1 to 6 will be described. FIG. 1 is a top view showing the configuration of the vehicular lamp 1. FIG. 2 is a side view showing the configuration of the vehicular lamp 1. FIG. 3 is a main part front view showing the configuration of the vehicular lamp 1. 4 is a cross-sectional view taken along line AA of the vehicular lamp 1 shown in FIG. FIG. 5 is a sectional view taken along line BB of the vehicular lamp 1 shown in FIG. 6 is a cross-sectional view taken along line CC of the vehicular lamp 1 shown in FIG. In the drawings shown below, an XYZ orthogonal coordinate system is set, the X-axis direction is the front-rear direction (length direction) of the vehicle lamp, the Y-axis direction is the left-right direction (width direction) of the vehicle lamp, and the Z-axis direction. Are shown as the vertical direction (height direction) of the vehicular lamp 1.

  The vehicular lamp 1 according to the present embodiment is, for example, a tail lamp (tail lamp) that is mounted at both corner portions on the rear end side of a vehicle (not shown) (the corner portion on the left rear end side in the present embodiment). The invention is applied. In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to when the vehicle lamp 1 is viewed from the front (rear side of the vehicle) unless otherwise specified. Means the respective directions. Therefore, each direction when the vehicle is viewed from the front (front of the vehicle) is a direction in which front, rear, left and right are reversed.

  Specifically, the vehicular lamp 1 generally includes a plurality of light sources 2 and a light guide 3 disposed in front of the plurality of light sources 2. The plurality of light sources 2 and the light guide 3 are arranged in a corner portion on the left rear end side of the vehicle in a state of being housed inside a lamp body (not shown) constituting the vehicular lamp 1. .

  The plurality of light sources 2 include, for example, chip LEDs (SMD LEDs) that emit red light (hereinafter simply referred to as light) L. Moreover, the high power (high brightness) type thing for vehicle illumination is used for chip LED.

  The plurality of light sources 2 are arranged on the same surface of the same substrate 4 at equal intervals by being mounted on one surface (front surface) of the flat substrate 4. Each light source 2 emits light L radially toward a direction perpendicular to one surface of the substrate 4.

  The board | substrate 4 consists of a printed wiring board (PWB) by which wiring etc. were provided in at least one surface (front surface) or both surfaces (front surface and back surface). In addition to the light source 2 described above, the substrate 4 has a current limiting resistor that limits the current flowing through the light source 2 and a protection circuit (diode) that prevents reverse voltage (surge) from being applied to the light source 2. It is possible to mount a mounting component such as a connector electrically connected to the wiring.

  The plurality of light sources 2 are arranged obliquely from the inner side to the outer side in the vehicle width direction (Y-axis direction) in accordance with the slant shape applied to the corner portion. In other words, the plurality of light sources 2 are configured to be arranged obliquely along one surface of the substrate 4 by arranging the substrate 4 obliquely.

  Thereby, the optical axis AX of the light L emitted from each light source 2 is a predetermined angle (outward to the left side) behind the vehicle with respect to a reference axis BX extending in the vehicle front-rear direction (X-axis direction) ( Hereinafter, it is referred to as an optical axis angle.) It is inclined at θ. The optical axes AX of the light L emitted from each light source 2 are parallel to each other. In addition, optical axis angle (theta) is the range of 10 degrees-60 degrees, More preferably, it is the range of 30 degrees-45 degrees.

  The light guide 3 includes a first light guide 5 and a second light guide 6 that guide light L emitted from the plurality of light sources 2 as an inner lens of the vehicular lamp 1. The first light guide 5 has a substantially flat plate shape parallel to the horizontal direction. On the other hand, the second light guide unit 6 is continuous with the first light guide unit 5 and is inclined substantially obliquely downward from the vehicle rear side end of the first light guide unit 5 toward the vehicle rear side. It has a flat plate shape. For the light guide 3, a material having a refractive index higher than that of air, such as transparent resin such as polycarbonate and acrylic, or glass can be used.

  The first light guide 5 includes a first end face 5a located on the side facing the plurality of light sources 2, a second end face 5b located on the opposite side of the first end face 5a, and a first end face. 5a and the second end surface 5b and between the third end surface 5c located on the outer side (left side) in the vehicle width direction (Y-axis direction), and between the first end surface 5a and the second end surface 5b. And a fourth end face 5d located on the inner side (right side) of the vehicle width direction (Y-axis direction).

  Of the four end faces 5a to 6b constituting the first light guide unit 5, the first end face 5a and the second end face 5b are incident from the first end face 5a and guided toward the second end face 5b. With respect to the traveling direction of the light L, the light is inclined toward the direction in which the outer side (left side) recedes from the inner side (right side) in the vehicle width direction (Y-axis direction).

  On the other hand, the third end surface 5c is inclined substantially at right angles to the first end surface 5a, and the fourth end surface 5d is inclined at an obtuse angle with respect to the first end surface 5a. The third end surface 5c has a shorter distance connecting the first end surface 5a and the second end surface 5b than the fourth end surface 5d.

  The angle at which the third end surface 5c and the fourth end surface 5d incline may be changed as long as it satisfies a condition for totally reflecting the light L at the third end surface 5c and the fourth end surface 5d described later. Is possible.

  The first end surface 5 a has a plurality of protruding portions 50 that protrude to face the plurality of light sources 2. The front end surface 50 a of each protrusion 50 constitutes an incident surface on which the light L emitted from each light source 2 is incident.

  The light L emitted from the plurality of light sources 2 is guided in the in-plane direction of the first light guide unit 5 from the front end surface 50a of each protrusion 50 toward the second end surface 5b. On the other hand, the light L emitted from the plurality of light sources 2 projects in the thickness direction of the first light guide unit 5 while being internally reflected between the upper surface 5e and the lower surface 5f of the first light guide unit 5. The light is guided from the front end surface 50a of the portion 50 toward the second end surface 5b.

  In addition, the first diffusing section 7 is provided on the front end face 50a of each protrusion 50 to diffuse the light L incident on the front end face 50a in the direction in which the plurality of light sources 2 are arranged (horizontal direction). The first diffusing portion 7 is configured by providing a diffusing shape for diffusing the light L in the direction (horizontal direction) in which the plurality of light sources 2 are arranged on the tip surface 50 a of each protruding portion 50.

  For example, in the present embodiment, the first diffusing portion 12 has a configuration in which an uneven shape that diffuses the light L emitted from the light source 2 is provided by applying a texture to the tip surface 50a of the protruding portion 50. Yes. Thereby, in the 1st spreading | diffusion part 7, the light L which injected into the front end surface 50a of the protrusion part 50 can be spread | diffused uniformly in the direction (horizontal direction) in which the several light sources 2 are located in a line.

  Note that the first diffusion unit 7 is not limited to the above-described diffusion shape, and can be changed as appropriate. Moreover, the 1st spreading | diffusion part 7 is not necessarily an essential structure, and can also be abbreviate | omitted depending on the case.

  The first light guide 5 connects the first end surface 5a and the front end surface 50a of the protrusion 50, and is located on the outer side in the vehicle width direction, the first side end surface 50b, the first end surface 5a, It has the 2nd side end surface 50c which ties between the front end surfaces 50a of the protrusion part 50, and is located inside a vehicle width direction.

  The first side end surface 50b constitutes one reflection surface that reflects the light L1 incident on the first side end surface 50b toward the second end surface 5b. On the other hand, the second side end face 50c constitutes the other reflecting face that reflects the light L2 incident on the second end face 50c toward the second end face 5b.

  Here, the light Lb incident on the first side end face 50b is reflected from the outside (left side) to the inside (right side) in the vehicle width direction (Y-axis direction). On the other hand, the light Lc incident on the second side end face 50c is reflected from the inner side (right side) to the outer side (left side) in the vehicle width direction (Y-axis direction).

  As a result, the light Lb and Lc reflected by the first side end surface 50b and the second side end surface 50b travel toward the second end surface 5b while intersecting each other, so that the first end surface 5a and the front end surface 50a Regardless of the distance between them, it is possible to improve the uniformity of the light L toward the second end face 5b.

  The second end surface 5 b constitutes a first reflection surface that reflects the light L incident from the tip surface 50 a of each protrusion 50 toward the second light guide 6. That is, the second end surface 5b is inclined toward the obliquely downward direction behind the vehicle. The second end face 5b is provided with a second diffusing portion 8 that diffuses the light L incident on the second end face 5b in the vehicle width direction (Y-axis direction).

  The second diffusing section 8 is configured by providing a diffusing shape for diffusing the light L in the vehicle width direction (Y-axis direction) on the second end surface 5b. For example, in the present embodiment, as the second diffusing portion 8, a cylindrical recess (hereinafter referred to as a knurl) extending in the vertical direction (Z-axis direction) by performing knurling on the second end surface 5 b. .) 8a is continuously arranged in the horizontal direction.

  In the second diffusing unit 8, the degree of light L increases from the inner side (right side) to the outer side (left side) in the vehicle width direction (Y-axis direction). Specifically, in the second diffusing portion 8 of the present embodiment, for example, the radius of curvature of the knurl 8a decreases from the inner side (right side) to the outer side (left side) in the vehicle width direction (Y-axis direction). . On the other hand, the interval between the knurls 8a is the same.

  In this case, the light L incident on the outer side (left side) in the vehicle width direction (Y-axis direction) is closer to the first end surface 5a than the light L incident on the inner side (right side) in the vehicle width direction (Y-axis direction). Since the distance to the second end face 5b is shortened, the spread angle of the diffusion by the first diffusing section 7 is narrow, and the light is spot-like and strong. On the other hand, the outer side (left side) of the second diffusing unit 8 has a smaller radius of curvature of the knurl 8a than the inner side (right side), and thus the degree of diffusion of the light L is increased.

  Conversely, the light L incident on the inner side (right side) in the vehicle width direction (Y-axis direction) is greater from the first end surface 5a than the light incident on the outer side (left side) in the vehicle width direction (Y-axis direction). Since the distance to the second end face 5b is long, the diffusion angle of the diffusion by the first diffusion portion 7 is wide, and the light becomes weakly diffused. On the other hand, the inner radius (right side) of the second diffusing portion 8 has a larger radius of curvature of the knurl 8a than the outer radius (left side), so that the degree of diffusion of the light L is reduced.

  Thereby, in the 2nd spreading | diffusion part 8, the light L which injected into the 2nd end surface 5b can be more uniformly diffused in a vehicle width direction (Y-axis direction) by adjusting the curvature radius of the knurled 8a. .

  In addition, in the 2nd spreading | diffusion part 8, although the uniformity of the light L diffused in the vehicle width direction is controlled by adjusting the curvature radius of the knurl 8a mentioned above, adjusting the space | interval of the knurl 8a. Thus, the uniformity of the light L diffused in the vehicle width direction can be controlled. Furthermore, in the 2nd spreading | diffusion part 8, you may control the uniformity of the light L diffused in a vehicle width direction by adjusting the curvature radius and space | interval of the knurl 8a mentioned above.

  Specifically, when the uniformity of the light L diffused in the vehicle width direction is controlled by the interval between the knurls 8a, the knurl increases from the inner side (right side) to the outer side (left side) in the vehicle width direction (Y-axis direction). What is necessary is just to shorten the space | interval of 8a.

  In this case, the outer side (left side) of the second diffusion unit 8 is closer to the knurling 8a than the inner side (right side), and thus the degree of diffusion of the light L is increased. On the other hand, the inner side (right side) of the second diffusing unit 8 has a coarser knurled gap 8a than the outer side (left side), and thus the degree of diffusion of the light L is reduced.

  Thereby, in the 2nd spreading | diffusion part 8, the light L which injected into the 2nd end surface 5b can be more uniformly diffused in a vehicle width direction (Y-axis direction) by adjusting the space | interval of the knurling 8a. Then, the light L reflected by the second end face 5 b becomes light L that is uniformly diffused in the vehicle width direction (Y-axis direction) and enters the second light guide 6.

  The third end surface 5c constitutes a second reflecting surface that reflects the light L1 incident on the third end surface 5c toward the second end surface 5b. On the other hand, the fourth end surface 5d constitutes a third reflecting surface that reflects the light L2 incident on the fourth end surface 5d toward the second end surface 5b.

  Here, the light L1 incident on the third end face 5c is reflected from the outside (left side) to the inside (right side) in the vehicle width direction (Y-axis direction). On the other hand, the light L2 incident on the fourth end surface 5d is reflected from the inner side (right side) to the outer side (left side) in the vehicle width direction (Y-axis direction).

  Accordingly, the lights L1 and L2 reflected by the third end surface 5c and the fourth end surface 5d are directed to the second end surface 5b while intersecting each other, so that the first end surface 5a and the second end surface 5b Regardless of the distance between them, it is possible to improve the uniformity of the light L toward the second end face 5b.

  The 2nd light guide part 6 has the some reflective cut 9 located in the surface (rear surface) 6a of the vehicle front side, and the output surface 10 located in the surface (front surface) 6b of the vehicle rear side. The rear surface 6a of the second light guide 6 is reflected by the third end surface 5c, and the fourth reflection reflects the light L guided in the second light guide 6 toward the emission surface 10. Make up surface. On the other hand, the front surface 6b of the second light guide 6 is a light guide 3 that emits light by emitting the light L reflected by the fourth reflection surface (the plurality of reflection cuts 9) toward the rear of the vehicle. A light emitting surface D is formed.

  The plurality of reflection cuts 9 reflect the light L incident on the rear surface 6 a of the second light guide 6 with respect to the emission surface 10 at an angle (incident angle) that is less than the critical angle. The reflection cut 9 only needs to totally reflect the light L at such an angle, and the shape, size, number, and the like are not particularly limited. For example, the reflection cut 9 of the present embodiment is configured by a groove portion having a substantially triangular cross section.

  The emission surface 10 emits the light L reflected by the plurality of reflection cuts 9 toward the rear of the vehicle (+ X axis direction). Further, the exit surface 10 is provided with a camber angle in accordance with the slant shape applied to the corner portion. The exit surface 10 is inclined with respect to the traveling direction of the light L emitted from the exit surface 10 in a direction in which the outside (left side) recedes from the inside (right side) in the vehicle width direction (Y-axis direction). ing. In addition, the emission surface 10 has a convex shape curved in the vehicle width direction (Y-axis direction).

  In the vehicular lamp 1 having the above-described configuration, the light emitting surface D of the light guide 3 emits light substantially uniformly by the light L emitted from the light emitting surface 10 to the outside of the light guide 3. (Surface emission).

  In the vehicular lamp 1 of the present embodiment, as described above, the plurality of light sources 2 are arranged obliquely along one surface of the substrate 4 by arranging the substrate 4 on which the plurality of light sources 2 are mounted obliquely. It is an arranged configuration.

  In this case, when the vehicular lamp 1 is viewed from the front (rear side of the vehicle), the light source 2 adjacent in the vehicle width direction (Y-axis direction) is more than the case where the light sources 2 are arranged stepwise as in the prior art. The interval can be reduced.

  Therefore, in the vehicular lamp 1 of the present embodiment, the number of light sources 2 arranged in the vehicle width direction (Y-axis direction) can be substantially increased. Thereby, in the vehicle lamp 1 of this embodiment, while ensuring the number of the light sources 2 (light quantity of the light L) required for the uniform light emission of the light emission surface D, according to the slant shape provided to a corner part, several Therefore, it is possible to avoid an increase in the size of the vehicular lamp 1 due to an increase in the number of light sources.

  In the vehicular lamp 1 according to the present embodiment, the light L incident from the distal end surface 50a of the protruding portion 50 is used in the first light guide 5 that guides the light L emitted from the plurality of light sources 2 described above. After diffusing in the direction in which the plurality of light sources 2 are arranged (horizontal direction) by the first diffusing unit 7, the space between the first end face 50b and the second side end face 50c and the third end face 5c and the fourth end face The light L diffused toward the second end face 5b is guided while being reflected in a direction intersecting with each other.

  Thereby, in the vehicular lamp 1 of the present embodiment, the light L reflected by the second end surface 5b is reflected toward the emission surface 10 by the plurality of reflection cuts 9 of the second light guide unit 5, and this emission is performed. The light L emitted from the surface 10 enables more uniform light emission with less luminance (light emission) unevenness on the light emitting surface D.

  Further, in the vehicular lamp 1 according to the present embodiment, the diffusion degree of the light L that is diffused in the vehicle width direction by the second diffusion unit 8 (knurl 8a) is adjusted for the light L incident on the second end surface 5b. Therefore, it is possible to further improve the uniformity of the light L that emits light from the light emitting surface D described above.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, the light source 2 may be anything that emits the light L radially, and a light emitting element such as a laser diode (LD) can be used in addition to the LED described above. Further, the number of light sources 2 to be arranged is not particularly limited, and the number of light sources 2 necessary for uniform light emission may be arranged.

  Further, the color of light emitted from the light emitting element is not limited to the above-described red light, and may be appropriately changed according to the use of the light source 2 such as white light or orange light. Furthermore, you may use the light source 2 from which at least 2 or more types of colors differ among the red light mentioned above, orange light, and white light.

  Moreover, although the said light guide 3 becomes the structure which integrated the 1st light guide part 5 and the 2nd light guide part 6 which were mentioned above, it is good also as a structure which divided | segmented some of them. . For example, the first light guide 5 and the second light guide 6 are divided into a first light guide plate and a second light guide plate, respectively, and combined to form the light guide 3. Is also possible.

  Moreover, in the said vehicle lamp 1, it is possible to change suitably the shape of the 2nd light guide part 6 with which the said light guide 3 is provided, etc. according to the design etc. of an actual vehicle. For example, the light guide 3 may be configured to include the second light guide 6A as shown in FIGS. 7 and 8 instead of the second light guide 6 described above. FIG. 7 is a perspective view showing the configuration of the second light guide 6A. FIG. 8 is a DD cross-sectional view of the second light guide 6A shown in FIG. Moreover, in the following description, about the site | part equivalent to the said vehicle lamp 1, description is abbreviate | omitted and shall attach | subject the same code | symbol in drawing.

  6 A of 2nd light guide parts have the substantially flat plate shape curved in the arch shape by the front view toward the front end side from the 2nd end surface 5b of the base end side. Further, the second light guide section 6A has a tapered shape in which the width gradually decreases from the proximal end side toward the distal end side.

  The second light guide 6A includes a plurality of grooves 61 provided side by side on the rear surface 6a, a plurality of light guide protrusions 62 provided between each of the plurality of grooves 61, a plurality of grooves 61, and a plurality of grooves. A light guide plate portion 63 provided continuously on the front surface 6 b side of the light guide convex portion 62. Further, the plurality of groove portions 61 and the plurality of light guide convex portions 62 extend while curving in an arch shape in front view from the proximal end side to the distal end side of the second light guide portion 6A, and their widths Has a tapered shape that gradually becomes narrower.

  The light guide convex part 62 and the light guide plate part 63 are parts for guiding the light L reflected by the second end surface 5b from the base end side to the tip side of the second light guide part 6A. The light L reflected by the second end face 5b is guided from the proximal end side of the second light guide section 6A toward the distal end side in the in-plane direction of the second light guide section 6A. The light L guided in the light guide convex portion 62 is guided from the base end side of the second light guide portion 6A toward the tip end side while repeating internal reflection with the side surface of the groove portion 61. The

  On the other hand, the light L reflected by the second end surface 5b is internally reflected between the rear surface 6a and the front surface 6b of the second light guide portion 6A in the thickness direction of the second light guide portion 6A. The light is guided from the proximal end side to the distal end side of the second light guide portion 6A.

  The bottom surface of the groove portion 61 constitutes a light emitting surface 64, and a part of the light L3 incident on the bottom surface of the groove portion 61 is at an angle (incident angle) that is less than the critical angle with respect to the front surface 6b of the light guide plate portion 63. reflect. The light emitting surface 64 is formed by roughening the bottom surface of the groove 61 so that light can be reflected.

  Further, the light emitting surface 64 may be a reflective cut surface in which a predetermined uneven shape is repeatedly provided on the bottom surface of the groove portion 61, for example. Further, in order to uniformly emit light from the base end side to the tip end side of the light emitting surface 64, it is possible to change the pitch, density, roughness, etc. of the unevenness formed on the bottom surface of the groove portion 61 in the longitudinal direction. .

  The front surface 6b of the light guide plate portion 63 constitutes an emission surface 65, and emits a part of the light L3 reflected by the bottom surface of the groove portion 61 toward the rear of the vehicle. Thereby, in the second light guide portion 6 </ b> A, a portion corresponding to the bottom surface of the groove portion 61 emits light in a line shape as the light emitting surface 64.

  In the vehicular lamp 1 of the present embodiment, as described above, the light L reflected by the second end surface 5b is uniformly diffused in the vehicle width direction. A plurality of light emitting surfaces 64 provided side by side in the width direction can emit light uniformly.

  In the vehicular lamp to which the present invention is applied, the second light guides 6 and 6A included in the light guide 3 are not necessarily indispensable, and may be omitted in some cases. In this case, the second cross section 5b of the first light guide unit 5 is used as an emission surface (light emission surface), and the light emission of the light guide 3 is performed by the light L emitted from the emission surface to the outside of the light guide 3. It is also possible to adopt a configuration in which the surface emits light substantially uniformly (surface light emission).

  In the above embodiment, the case where the present invention is applied to the vehicle lamp such as the above-described tail lamp is illustrated. However, when the tail lamp is configured, the plurality of light sources 2 and the light guide 3 serving as an inner lens are described. In addition, for example, it can be combined with other members such as an outer lens, a reflector, and an extension.

  Further, the vehicular lamp to which the present invention is applied is not limited to the tail lamp (tail lamp) described above, but includes, for example, a vehicular headlamp (head lamp), a vehicle width lamp (position lamp), and an auxiliary headlamp (sub-light). Headlamps), front (rear) fog lights (fog lamps), daytime running (daytime running) lamps, lid lamps, brake lamps (stop lamps), back lamps, turn indicators (blinker lamps), etc. The present invention can be widely applied to a vehicular lamp including a light source and a light guide plate.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Light source 3 ... Light guide 4 ... Board | substrate 5 ... 1st light guide part 5a ... 1st end surface (incident surface) 5b ... 2nd end surface (1st reflective surface) 5c ... 1st 3 end face (second reflecting face) 5d ... fourth end face (third reflecting face) 6a, 6b ... second light guide part 7 ... first diffusing part 8 ... second diffusing part 9 ... reflecting Cut (fourth reflecting surface) 10 ... emitting surface (light emitting surface) 50 ... projecting portion 50a ... tip end surface 50b ... first side end surface 50c ... second side end surface 61 ... groove portion 62 ... light guide convex portion 63 ... guide Optical plate portion 64 ... Light emitting surface 65 ... Emission surface D ... Light emitting surface

Claims (7)

Multiple light sources;
A light guide for guiding the light emitted from the plurality of light sources,
The plurality of light sources are arranged side by side obliquely from the inner side to the outer side in the vehicle width direction according to the slant shape applied to the corner portion on the front end or rear end side of the vehicle,
The light guide includes a first end surface located on a side facing the plurality of light sources, a plurality of projecting portions projecting from the first end surface to face the plurality of light sources, and the first end surface. A second end face located on the opposite side of the first end face, a first side end face that connects the first end face and the tip end face of the projecting portion and is located outside in the vehicle width direction, and A second side end surface that is located on the inner side in the vehicle width direction and connects between the end surface of 1 and the tip end surface of the protrusion,
The first side end surface and the second side end surface are outside the inner side in the vehicle width direction with respect to the traveling direction of the light incident from the tip surface and guided toward the second end surface. Is inclined toward the direction of retreating,
The first side end face and the second side end face are inclined at an angle that reflects light incident on the first side end face and the second side end face toward the second end face,
The first side end face has a shorter distance between the first end face and the tip end face than the second side end face. The light guide body connects between the first end surface and the second end surface, and has a third end surface located outside in the vehicle width direction, and the first end surface and the second end surface. And a fourth end face that is located on the inner side in the vehicle width direction.
The third end face and the fourth end face are inclined at an angle that reflects light incident on the third end face and the fourth end face toward the second end face,
2. The vehicular lamp according to claim 1, wherein the third end surface has a shorter distance connecting the first end surface and the second end surface than the fourth end surface. .   The vehicular lamp according to claim 1, wherein the plurality of light sources are arranged side by side on the same surface.   The vehicular lamp according to claim 3, wherein the plurality of light sources are mounted on a surface of the same substrate.   5. The vehicle according to claim 1, wherein the front end surface includes a first diffusion unit that diffuses light incident on the front end surface in a direction in which the plurality of light sources are arranged. Light fixture.   6. The vehicle according to claim 1, wherein the second end surface includes a second diffusion portion that diffuses light incident on the second end surface in a vehicle width direction. Light fixture.   The vehicular lamp according to claim 6, wherein the second diffusion portion has a light diffusion degree that increases from the inside toward the outside in the vehicle width direction.

Images