JP2012190762A - Lamp fitting for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp fitting for a vehicle with utilization efficiency of light emitted from a light guide body improved.SOLUTION: A columnar light guide body 10 is provided in a lamp room S of the lamp fitting 1, and first inner-face reflection steps 16 for reflecting light toward front of the lamp fitting are formed at given positions in a side-face peripheral direction of the light guide body 10 as well as second inner-face reflection steps 18 at positions different from forming positions of the first inner-face reflection steps 16, along an extended direction of the light guide body 10. As the inner-face reflection steps for emitting guided light inside the light guide body 10 are increased in a side-face peripheral direction of the light guide body, guided light guided through the inside of the light guide body 10 from one light-incident end part 12 to the other 13 gets trapped at the second inner-face reflection steps 18 though not at the first inner-face reflection steps 16, so that light emitted from the other end part 13 is accordingly decreased to a large extent and light that is to be lost light by nature is effectively taken out. Then if the second inner-face reflection steps 18 are also provided at given positions where light is reflected toward front of the lamp fitting, emission light from the light guide body 10 can be effectively utilized for light emission of the lamp fitting 1.

Description

  The present invention relates to a vehicular lamp including a light guide that emits light by light guide, and in particular, light source light incident on a light incident end of the light guide is guided while repeating internal reflection in the light guide. In addition, the present invention relates to a vehicular lamp that emits light by being reflected and emitted by an inner surface reflection step formed in a predetermined region on a side surface of a light guide.

  As this type of vehicle lamp, as shown in Patent Document 1, it extends in the left-right direction of a lamp chamber defined by an outer cover and a lamp body, and has one end (light incident end). ) And a columnar light guide that is reflected by an internal reflection step formed on the back surface thereof and emits light forward (toward the outer cover), and a front surface of the light guide. And a translucent planar light emitter disposed along the light guide. In such a lamp, the light source light that has entered the light guide from the light incident end is guided toward the other end, and is reflected by the inner surface reflection step and emitted from the front of the light guide to the front of the lamp. Thus, the columnar light guide emits light in a line shape, and the planar light emitter emits light in a strip shape using the columnar light guide as a light source.

Japanese Patent Laying-Open No. 2005-285667 (see paragraph 0008, FIG. 1)

  However, in the light guide as in Patent Document 1, a part of the light guide that is incident from the light incident end and is directed to the other end is not emitted from the front surface of the light guide (without being directed forward of the lamp). ), And emitted from the other end as it is in the left-right direction of the lamp chamber. Such light emission in a direction that does not go to the front of the lamp does not contribute to the light emission of the vehicular lamp, and thus the luminous efficiency of the lamp is reduced accordingly. That is, there has been a problem that utilization efficiency (extraction efficiency) of light emitted from the light guide is poor.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a vehicular lamp that improves the utilization efficiency of light emitted from a light guide.

  In order to achieve the above object, in the vehicular lamp according to claim 1, a columnar light guide body provided with an inner surface reflection step at a predetermined position on a side surface, and a light incident end portion of the light guide body, facing each other. A light source that is provided from the light incident end, guides the light source through the light guide body, and reflects and exits the inner surface reflecting step. A first inner surface reflection step that reflects light toward the front of the lamp is formed at a predetermined direction in the light guide body extending direction, and the light guide body is different from the first inner surface reflection step formation position. A second inner surface reflection step was formed along the light guide body extending direction at a predetermined position in the circumferential direction of the side surface.

  (Operation) In the conventional structure, the inner surface reflection step is formed at one position in the circumferential direction of the light guide body so as to emit light forward (toward the outer cover) of the lamp, and the light guide not captured by the inner surface reflection step. Is incident from the light incident end, but exits from the other end as it is and does not go to the front of the lamp, so a part of the light from the light source light is lost through the light guide. It was.

  However, in the present invention, the second inner surface reflection step is provided at a predetermined position in the circumferential direction of the light guide body that is different from the first inner surface reflection step forming position, and the inner surface reflection step for emitting the light guide is provided. By increasing in the direction, the light guide from the light incident end to the other end is captured in the second internal reflection step even if it is not captured in the first internal reflection step. The light emitted from the end portion is greatly reduced, and the extraction efficiency of the emitted light from the light guide is improved accordingly.

  If the second inner surface reflection step is also provided at a predetermined position that reflects light toward the front side of the lamp, the probability that light will be emitted forward by that amount will increase and contribute to the light emission of the lamp. Use efficiency improves.

  According to a second aspect of the present invention, in the vehicular lamp according to the first aspect, a plate-shaped light guide is disposed on a side surface of the columnar light guide opposite to the second inner surface reflection step forming area. In addition, a third inner surface reflection step is formed on the back surface of the plate light guide, and the light guide reflected by the second inner surface reflection step guides the plate light guide. The light is reflected by the third inner surface reflection step and emitted forward of the lamp.

  (Operation) The light guide captured in the first internal reflection step is emitted forward from the columnar light guide. On the other hand, the light guide captured in the second inner surface reflection step is reflected toward the plate-shaped light guide disposed at a position opposite to the second inner surface reflection step, and is guided through the plate-shaped light guide. At the same time, the light is reflected by the third inner surface reflection step formed on the back surface of the plate-like light guide and emitted forward of the lamp. Thereby, in addition to the line light emission by the columnar light guide, the surface light emission by the plate light guide is obtained.

  According to a third aspect of the present invention, in the vehicular lamp according to the second aspect, the columnar light guide and the plate light guide are integrally formed.

  (Operation) By making the columnar light guide and the plate light guide into an integrally molded body, both can be made a single light guide.

  Further, if the columnar light guide and the plate-shaped light guide are separate, the light emitted from the columnar light guide once enters the plate-shaped light guide after exiting the atmosphere. Since there are two interfaces between the exit surface and the exit surface of the plate-like light guide, light scattering or reflection occurs when light enters the plate-like light guide from the columnar light guide. However, by using an integrally molded body, the presence of the interface can be eliminated, and light loss due to scattering or the like can be prevented.

  According to a fourth aspect of the present invention, in the vehicular lamp according to the first aspect, a light diffusing element that covers at least the front side of the columnar light guide is disposed along the extending direction of the columnar light guide, The light emitted from the columnar light guide is diffused through the light diffusing element and emitted forward of the lamp.

  (Operation) Since the light captured and emitted by the first and second inner surface reflection steps is emitted forward of the lamp in a state of being diffused by the light diffusing element extending to a position covering the front side of the columnar light guide. The light diffusing element extending in the lamp chamber emits light uniformly.

  As described above, according to the first aspect of the invention, since the light that is originally lost light is effectively extracted by the second internal reflection step, the extraction efficiency of the emitted light from the light guide is improved.

  If the second inner surface reflection step is also provided at a position where the light is reflected toward the front side of the lamp, the light emitted from the light guide is effectively used for light emission of the lamp, so that the luminance of the lamp is improved accordingly. It is possible to provide a vehicular lamp that is excellent in visibility.

  According to the invention which concerns on Claim 2, the light which was originally lost light in the columnar light guide is utilized effectively for the surface light emission of a plate-shaped light guide.

  According to the invention according to claim 3, when it is desired to form one light emitter (light guide) with a plurality of light guides, the columnar light guide and the plate light guide are formed as an integrally molded body, The light emitter (light guide) can be easily formed. Further, when the columnar light guide and the plate-shaped light guide need not be aligned when assembled in the lamp chamber, the arrangement becomes easy.

  Moreover, since the loss is not caused when light is incident on the plate-shaped light guide from the columnar light guide by using the integrally formed body, light can be used more effectively.

  According to the fourth aspect of the present invention, it is possible to provide a vehicular lamp that has a high brightness and a uniform appearance, and has a good appearance.

The front view of the vehicle lamp which accommodates the lamp | ramp which concerns on the 1st-4th Example of this invention integrally. The longitudinal cross-sectional view of the backup lamp which concerns on a 1st Example (cross-sectional view which follows the line II-II shown in FIG. 1). The longitudinal cross-sectional view (cross-sectional view which follows the line III-III shown in FIG. 1) of the tail and stop lamp which concerns on a 2nd Example. The longitudinal cross-sectional view (cross-sectional view in alignment with line IV-IV shown in FIG. 1) of the tail lamp which concerns on a 3rd Example. The longitudinal cross-sectional view (sectional view which follows the line VV shown in FIG. 1) of the turn signal lamp which concerns on a 4th Example. The longitudinal cross-sectional view of the modification of the turn signal lamp.

  Hereinafter, embodiments of the present invention will be described based on examples.

  FIG. 1 is a front view of a vehicular lamp that integrally accommodates lamps A, B, C, and D according to first to fourth embodiments of the present invention. In addition, FIG. 1 shows the lamp room which can be seen through the outer cover by a solid line. Moreover, since LED which is a light source becomes a structure which is not visually recognized by the lamp front view by the extension etc. which are not shown in figure, it shows with a broken line. In addition, a columnar light guide that is not visible in the front view of the lamp by a diffusion lens described later, and an internal reflection step formed on the back surface of the columnar light guide are also indicated by broken lines.

  The vehicular lamp 1 is a rear combination lamp provided at the rear of the vehicle. Reference symbol S denotes a lamp chamber of the lamp 1 defined by the lamp body 2 and the transparent outer cover 4. The lamp body 2, the outer cover 4, and the lamp chamber S are three-dimensionally curved so as to follow the streamline shape of the vehicle body from the center of the vehicle to the side of the vehicle. The backup lamp A according to the first embodiment is on the left side of the lower side of the lamp chamber S, and the tail and stop lamp B according to the second embodiment is from the right side to the right side of the lamp chamber S. The tail lamp C according to the third embodiment is accommodated in the upper side, and the turn signal lamp D according to the fourth embodiment is accommodated in the central part of the lamp chamber S.

  The first embodiment relates to the backup lamp A of the lamp 1 in FIG. 1, and FIG. 2 is a longitudinal sectional view of the backup lamp A (cross-sectional view along the line II-II shown in FIG. 1). . The arrows in FIG. 2 indicate light rays. 1 and 2, a lamp A is composed of a columnar light guide 10 that extends in the left-right direction of the vehicle in a lamp chamber S and a diffusion lens 20 as a light diffusion element.

  The columnar light guide 10 is an optical member made of an elongated cylindrical light-transmitting synthetic resin. The LED 6 that is a light source is arranged facing the left end portion of the columnar light guide 10, and the light source light of the LED 6 that has entered the end portion as the light incident end portion 12 is the inner surface of the columnar light guide 10. The light is guided toward the other end 13 while repeating total reflection at every point.

  A first inner surface reflecting step 16 that reflects light toward the front of the lamp 1 (in the direction of the outer cover 4) is provided on the side rear surface portion 17 (the position corresponding to the right of the circular cross section in FIG. 2) of the columnar light guide 10. It is formed in the whole area along the extending direction of the columnar light guide 10. Further, the light guide side surface lower surface portion 19 (a position corresponding to the bottom of the cross-sectional circle in FIG. 2), which is 90 degrees different from the formation position of the first inner surface reflection step 16 in the circumferential direction of the light guide body, Similarly, the two inner surface reflection steps 18 are formed over the entire extending direction of the columnar light guide 10 and are configured to reflect light upward of the lamp chamber S.

  The diffusing lens 20 is a translucent optical member formed in a lamp front view rectangle and having a substantially L-shaped vertical cross section, and the front surface of the columnar light guide 10 extends along the extending direction of the columnar light guide 10. And it is arrange | positioned so that an upper surface may be covered. The front surface portion 22 and the upper surface portion 23 of the diffusing lens 20 are subjected to so-called “texture processing” in which the outer surface or the back surface thereof is roughened, or light scattering particles are added to the inside of the diffusing lens 20 to produce light scattering characteristics. Is granted. Thereby, when the emitted light from the columnar light guide 10 passes through the diffusion lens 20, it is configured to emit light from the surface of the diffusion lens 20 almost uniformly as diffuse light having weak directivity. . Further, the upper surface portion 23 of the diffusing lens 20 is inclined upward from the front to the rear of the lamp chamber, and is configured so that a wider area appears to emit light when the lamp is viewed from the front. Has improved.

  When the LED 6 that is the light source is turned on, the light source light incident from the light incident end 12 is guided toward the other end 13 while repeating total reflection in the columnar light guide 10. Among the light guides, the light guide captured by the first inner surface reflection step 16 is reflected toward the front of the lamp 1 and is diffused in the vertical and horizontal directions by the front surface portion 22 of the diffusion lens 20 to be emitted from the outer cover 4. It is emitted toward the front. On the other hand, the light guide captured by the second inner surface reflection step 18 is reflected upward of the lamp chamber S and diffused by the upper surface portion 23 of the diffusing lens 20, and the diffused light is affected by the inclination of the upper surface portion 23. A part of the light is distributed to the front side of the lamp and emitted mainly upward and forward of the lamp. As a result, when the lamp is viewed from the front, the diffusing lens 20 (the front surface portion 22 and the upper surface portion 23) emits light uniformly in a band shape over a wide area.

  Here, in the conventional structure, the inner surface reflection step is formed at one place in the circumferential direction of the light guide body side surface on the back surface of the light guide body side so as to emit light forward of the lamp, and is not captured by the inner surface reflection step. Although the light guide was incident from the light incident end, it was emitted from the other end as it was in the left-right direction of the lamp (in the lamp chamber) without going to the front of the lamp. Since the emitted light from the other end portion does not contribute to the light emission of the lamp, a part of the light source light is lost through the light guide.

  However, in this embodiment, the inner surface reflecting step for emitting the light guide is provided by providing the second inner surface reflecting step 18 at a position different from the first inner surface reflecting step 16 in the circumferential direction of the side surface of the columnar light guide 10. By increasing in the circumferential direction of the side surface, the light guide from the light incident end portion 12 toward the other end portion 13 is not captured by the first inner surface reflecting step 16 but is captured and emitted by the second inner surface reflecting step 18. Therefore, the light emitted from the other end 13 is greatly reduced. That is, the light that is originally lost light is effectively extracted by forming the second inner surface reflection step 18.

  A part of the emitted light extracted by the second inner surface reflection step 18 is diffused by the upper surface portion 23 of the diffusing lens 20 and distributed toward the front side of the lamp, and is effectively used for light emission of the lamp 1. Therefore, the luminance of the lamp A is improved as compared with the prior art.

  Furthermore, since the lamp 1 is normally disposed at a position that is looked down from the top when viewed from the front of a human eye, the design also requires the appearance from above. In the present embodiment, a part of the emitted light extracted by the second inner surface reflection step 18 goes upward of the lamp chamber S and is diffused and emitted by the diffusing lens 20, and the upper surface portion 23 emits light uniformly. The appearance from is also good. Also from this point, the light that is originally lost light by the second inner surface reflection step 18 is effectively used.

  As described above, the lamp A has surface emission with high brightness and a uniform feeling.

  In the present embodiment, the second inner surface reflection step 18 is formed at a position that is 90 degrees different from the first inner surface reflection step 16 in the circumferential direction of the light guide body. From the viewpoint of improvement, the second inner surface reflection step 18 may be formed at any location in the circumferential direction of the columnar light guide 10.

  Further, the light diffusing element may be formed by applying a texture to a part of the outer cover 4.

  The second embodiment relates to the tail and stop lamp B of the lamp 1 in FIG. 1, and FIG. 3 is a longitudinal sectional view of the tail and stop lamp B (cross section taken along line III-III shown in FIG. 1). Figure). The arrows in FIG. 3 indicate light rays.

  In the lamp B, the diffusing lens 20 in the first embodiment is formed in a substantially U-shaped vertical cross section (in addition to the front surface portion 22 and the upper surface portion 23, a bottom surface portion 24 which is similarly subjected to a graining process is provided. ), The columnar light guide 10 is surrounded by three sides. Correspondingly, a second inner surface reflection step is added to the columnar light guide 10 at a position different from the formation position of the first inner surface reflection step 16 in the circumferential direction of the light guide body. Specifically, the second inner surface reflecting step 18a is formed at a position different by 45 degrees above the light guide side surface back surface portion 17, and the second inner surface reflecting step 18b is formed at a position different by 45 degrees below the light guide material side surface back surface portion 17. (It was formed at a position corresponding to the upper right and lower right of the circular cross section in FIG. 3). Other configurations are the same as those of the first embodiment.

  With the above configuration, the reflected light at the second inner surface reflecting step 18b is emitted toward the upper front side of the lamp and is incident on the upper surface portion 23, and the reflected light at the second inner surface reflecting step 18a is directed toward the lower front side of the lamp. The light exits and enters the lower surface portion 24.

  That is, since the light guide in the columnar light guide 10 is captured by the second inner surface reflection step 18 a and the second inner surface reflection step 18 b in addition to the first inner surface reflection step 16, the emitted light from the columnar light guide 10. The extraction efficiency is further improved.

  In addition, since the emitted light from the second inner surface reflection steps 18a and 18b is directed to the front side of the lamp, the probability that the light is emitted to the front of the lamp increases accordingly, and the emitted light from the columnar light guide 10 is increased. The brightness of the lamp B is improved by being effectively used for the light emission of the lamp B.

  And since the emitted light from the columnar light guide 10 is diffused by the diffusing lens 20, as in the first embodiment, all of the front surface portion 22, the upper surface portion 23, and the lower surface portion 24 emit light uniformly. The lamp B is also provided with a surface emission with a high brightness and a uniform feeling, which has a larger area and looks good from both the front view of the lamp and the slightly upward view.

  In this embodiment, the upper surface portion 23 of the diffusion lens 20 emits light uniformly by the light guide extracted in the second inner surface reflection step 18b, and the lower surface of the diffusion lens 20 by the light guide extracted in the second inner surface reflection step 18a. The unit 24 is configured to emit light uniformly. That is, by adding the second inner surface reflection step, the light emitting surface of the diffusion lens can be increased, and the formation position of the second inner surface reflection step in the circumferential direction of the light guide body side surface corresponding to the shape of the diffusion lens. Since it only has to be decided, it is possible to realize a variety of light distribution variations.

  The third embodiment relates to the tail lamp C of the lamp 1 in FIG. 1, and FIG. 4 is a vertical sectional view of the tail lamp C (cross-sectional view along line VI-VI shown in FIG. 1). The arrows in FIG. 4 indicate light rays.

  In the lamp C, the diffusion lens 20 in the first embodiment is not provided. Instead, the columnar light guide 10 is changed from a circular shape in a vertical cross section to a rectangular shape in a vertical cross section, and its upper surface 14 is raised from the front to the rear in the lamp chamber. And the surface of the upper surface 14 and the front surface 15 of the columnar light guide 10 was subjected to a texture process. Other configurations are the same as those of the first embodiment.

  With the above configuration, in the first embodiment, the diffused lens 20 is provided to diffuse the emitted light from the columnar light guide 10, and the upper surface portion 23 of the diffuser lens 20 is inclined to distribute the light forward. Although configured, in the third embodiment, the function of the diffusing lens 20 is realized by changing the shape of the columnar light guide 10 and applying a surface texture. Therefore, the same effect as the first embodiment, that is, the improvement of the extraction efficiency of the emitted light from the columnar light guide 10, the effective use of the extracted emitted light, the uniform emission of the lamp C and the wider area emission, from above Since the appearance improvement when visually recognized is realized by only the columnar light guide 10 (with one component), in addition to the first embodiment, there is a further effect that the number of components can be reduced.

  The fourth embodiment relates to the turn signal lamp D of the lamp 1 in FIG. 1, and FIG. 5 is a longitudinal sectional view of the turn signal lamp D (cross sectional view taken along line VV shown in FIG. 1). is there. The arrows in FIG. 5 indicate light rays.

  In the lamp D, a plate-shaped light guide 30 extending upward from the lamp chamber is integrally formed on the side surface of the columnar light guide 10 in the first embodiment at a position facing the formation area of the second inner surface reflection step 18. In addition, the third inner surface reflecting step 36 (so-called dot-stitch) having a shape that is uniformly recessed in a conical shape is formed on the entire back surface 32 of the plate-shaped light guide 30, and the diffusing lens 20 is omitted. Other configurations are the same as those of the first embodiment.

  With the above configuration, the light guide captured by the first inner surface reflection step 16 is emitted forward from the columnar light guide 10 and contributes to the light emission of the columnar light guide 10 as in the first embodiment. On the other hand, the light guide captured in the second inner surface reflection step 18 is reflected toward the plate-shaped light guide 30 formed to extend to a position facing the second inner surface reflection step 18, and the plate-shaped light guide 30. The light is incident into the plate-shaped light guide 30 from a direction orthogonal to the lower surface 33 and guided to the other surface 34 while repeating internal reflection, and at a third inner surface reflection step 36 provided on the rear surface 32. Reflected and emitted forward of the lamp.

  Thereby, the columnar light guide 10 emits light in a line shape by the first inner surface reflection step 16 as usual, and in addition to this, the plate-like light guide 30 is formed by the second inner surface reflection step 18 and the third inner surface reflection step 36. Since the surface light is emitted, the light originally lost light in the columnar light guide 10 is extracted and is effectively used for the surface light emission of the plate light guide 30.

  In addition, since the columnar light guide 10 and the plate-like light guide 30 are formed as an integral molded body, both become a single light guide, and a plurality of light guides form one light emitter (light guide). In the lamp D, the light emitter (light guide) can be easily formed. In addition, when the lamp D is assembled in the lamp chamber S, the column light guide 10 and the plate light guide 30 do not need to be aligned, so that the arrangement becomes easy.

  When the columnar light guide 10 and the plate-shaped light guide 30 are formed separately, the light emitted from the columnar light guide 10 once enters the plate-shaped light guide 30 after being emitted into the atmosphere. There are two interfaces between the exit surface of the body 10 and the entrance surface of the plate-shaped light guide 30, so that when light enters the plate-shaped light guide 30 from the columnar light guide 10, Reflection occurs and light is lost. However, in the case of an integrally formed body, the interface does not exist between the columnar light guide 10 and the plate light guide 30, and light is lost between the light guides when light is incident. Therefore, it is more effective for effective use of light.

  On the other hand, FIG. 6 is a longitudinal sectional view of a modification of the turn signal lamp, that is, the columnar light guide 10 and the plate light guide 30 are separated. Also in this configuration, the columnar light guide 10 emits light in a line shape by the first inner surface reflecting step 16, and the light reflected by the second inner surface reflecting step 18 is disposed at a position facing the second inner surface reflecting step 18. The incident light enters the plate-like light guide 30 and is reflected forward by the third inner surface reflection step 36 so that the plate-like light guide 30 emits light. Therefore, the loss light is effectively used.

  Conventionally, light emission obtained with a columnar light guide has been limited to narrow line light emission, but the second inner surface reflection step provided on the columnar light guide in any of the configurations of the present embodiment and its modifications. In addition to the combination of the other light guides provided opposite thereto, the light emitting area in the lamp chamber S is expanded, and various light emission variations not limited to line light emission can be realized.

  As described above, the second inner surface reflection step 18 may be formed at any position in the circumferential direction of the side surface of the columnar light guide 10, but from the viewpoint of enlarging the light emission area of the lamp D in front view of the lamp. The first inner surface reflection step 16 is formed on the rear surface 32 of the columnar light guide 10 so that the columnar light guide 10 emits light efficiently and the front surface 31 of the plate light guide 30 emits light over a wide area. A configuration in which the light guide 30 is disposed at a position facing the upper end of the side surface of the columnar light guide 10 is preferable. Therefore, if the second inner surface reflecting step 18 is disposed at a position of 90 degrees with respect to the first inner surface reflecting step 16, substantially all of the reflected light from the second inner surface reflecting step 18 is the lower surface 33 of the plate-like light guide 30. Since the light is efficiently incident from the direction perpendicular to the surface and contributes to the surface light emission of the plate-like light guide 30, the best arrangement is obtained.

  As described above, the lamps A to D housed in the lamp 1 all have surface emission with high brightness and a uniform feeling. As a result, the lamp 1 is excellent for visibility and has a high appearance quality. It is a light fixture.

  In addition, although the 1st-4th Example was used as the lamp 1 which is a rear combination lamp, you may use as a clearance lamp or a daytime running lamp in a front lamp.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Lamp body 4 Outer cover 6 LED which is a light source
DESCRIPTION OF SYMBOLS 10 Columnar light guide 12 Light incident edge part 16 1st inner surface reflection step 18, 18a, 18b 2nd inner surface reflection step 20 The diffusion lens 30 which is a light-diffusion element Plate-shaped light guide 36 3rd inner surface reflection step A Backup lamp B Tail and stop lamp C Turn signal lamp D Tail lamp S Light room

Claims (4)

A columnar light guide provided with an internal reflection step at a predetermined position on the side surface, and a light source provided facing the light incident end of the light guide,
In the vehicular lamp that the light source light incident from the light incident end is guided in the light guide body and is reflected and emitted by the inner surface reflection step.
A first inner surface reflecting step for reflecting light toward the front of the lamp is formed along a direction in which the light guide extends, at a predetermined position in the circumferential direction of the light guide.
The second inner surface reflection step is formed along the light guide body extending direction at a predetermined position in the circumferential direction of the side surface of the light guide body, which is different from the first inner surface reflection step formation position. Light fixture. A plate-shaped light guide is disposed at a position on the side surface of the columnar light guide facing the second internal reflection step forming region, and a third surface is disposed on the back surface of the plate-shaped light guide. An internal reflection step is formed,
The light guide reflected in the second inner surface reflection step is guided in the plate-shaped light guide, reflected in the third inner surface reflection step, and emitted forward of the lamp. The vehicular lamp according to 1.   The vehicular lamp according to claim 2, wherein the columnar light guide and the plate light guide are formed as an integrally formed body.   A light diffusing element covering at least the front side of the columnar light guide is disposed along the extending direction of the columnar light guide, and light emitted from the columnar light guide diffuses through the light diffusing element. The vehicular lamp according to claim 1, wherein the vehicular lamp is configured to be emitted forward of the lamp.

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