WO2020162149A1

WO2020162149A1 - Vehicle lighting fixture

Info

Publication number: WO2020162149A1
Application number: PCT/JP2020/001690
Authority: WO
Inventors: 大生羽切; 克明大多和
Original assignee: 株式会社小糸製作所
Priority date: 2019-02-08
Filing date: 2020-01-20
Publication date: 2020-08-13
Also published as: JP7246197B2; JP2020129460A

Abstract

This vehicle lighting fixture is provided with: a rod-like light guide body disposed in a light room so as to extend in the upper and lower directions; and a light source for making light source light incident on the light guide body. The light guide body is provided with: a reflection step provided at the rear surface portion of the light guide body; and a protrusion-shaped step provided at the front surface portion of the light guide body. The reflection step makes the light source light, which has been incident on the light guide body, internally reflect and exit from the front surface portion toward the front of the lighting fixture, and the protrusion-shaped step makes part of reflected light deflect and exit in the lateral direction of the light fixture. The protrusion-shaped step has: a second reflection surface extending in a direction intersecting with the central axis line of the light guide body and that internally reflects the part of the reflected light in the lateral direction; and an exit surface that makes the light reflected on the second reflection surface deflect and exit in a horizontal direction, that is, in the lateral direction of the light fixture.

Description

Vehicle lighting

The present disclosure relates to a vehicular lamp that includes a light guide body that is arranged so as to extend in the vertical direction of a lamp chamber and that emits light by incident light source light. In particular, the present invention relates to a vehicular lamp that deflects and emits a part of the light source light that makes the entire light guide emit light to the side of the lamp through a convex step provided on the front surface of the light guide.

The light guide is arranged in the lamp chamber, and the light source light guided to the light guide is internally reflected by the reflection step provided on the rear surface of the light guide, so that the light is widely spread from the front of the light guide to the front of the lamp. There is a vehicle lamp that emits light. In the vehicle lamp, it is relatively easy to largely diffuse the light emitted from the front surface of the light guide body in the extending direction of the light guide body, but it is orthogonal to the extending direction of the light guide body. It is not easy to emit in the direction. For this reason, the light guide arranged in the lamp chamber so as to extend in the vertical direction cannot sufficiently emit (light distribution) to the side of the lamp.

In the following patent documents, the light incident from the lower end surface of a rod-shaped light guide arranged so as to extend in the lamp chamber in the vertical direction is internally reflected by a reflection step provided on the rear surface of the light guide, and the front part is reflected. A vehicle lamp has been proposed in which a part of the light internally reflected in the reflection step is deflected and emitted to the side of the lamp in a convex step provided on the front surface of the light guide body. There is.

A convex step with a triangular cross section (horizontal section) extending along the extending direction of the light guide is provided on the front surface of the light guide. The exit surface of the convex step emits not only the light that is internally reflected in the reflection step of the rear surface and directly emitted, but also the light that is internally reflected in the reflection step and that is also reflected by the inner surface of the light guide, and the side of the lamp. It is possible to emit (light distribution) sufficient light.

Japanese Unexamined Patent Publication No. 2014-127356 (see FIGS. 1, 2, 3 and 4)

In Patent Document 1, the convex step is formed by a triangular ridge in a transverse section (horizontal section) extending along the extending direction of the light guide. In Patent Document 1, it is difficult to freely adjust the amount of light emitted in the lateral horizontal direction of the lamp because of the ridge portion.

The light internally reflected forward in the reflection step provided on the rear surface of the light guide includes the light affected by the light guide direction (for example, upward), so that the pair of opposing emission surfaces is guided. The convex step extending parallel to the extending direction of the light body is configured so that the light emitted from the convex step is emitted to the lateral horizontal direction of the lamp orthogonal to the vertical direction in which the light guide extends. Difficult to control. The light emitted from the emitting surface of the convex step is also affected by the directionality of the light guide body in the light guide direction (upward), so the amount of light emitted in the lateral direction of the lamp is small and the vehicle side The visibility of the lamp from others is not fully satisfied.

The light emitted from the front part of the light guide to the front of the lamp also includes the light affected by the light guide direction (for example, upward). However, since the amount of light emitted from the front surface of the light guide is greater than the amount of deflected light that uses only a part of the light emitted from the front surface of the light guide, the visibility from the direction directly facing the lamp is reduced. Is no problem.

In the present disclosure, a convex step provided on the front surface of a light guide body arranged to extend in the up-down direction in a lamp chamber forms deflected outgoing light that is directed laterally in the lateral direction of the lamp, so that the vehicle lateral direction Provided is a vehicular lamp which is highly visible.

In order to achieve the above-mentioned object, a vehicular lamp according to an aspect of the present disclosure is a rod-shaped light guide arranged in a lamp chamber so as to extend in the vertical direction, and light source light in the vertical direction of the light guide. A vehicle lamp including a light source for
The light guide includes a reflection step provided on a rear surface of the light guide and a convex step provided on a front surface of the light guide,
In the reflecting step, the light source light that has entered the light guide body is internally reflected to be emitted from the front surface portion of the light guide body to the front of the vehicular lamp,
The convex step is at a position facing the reflecting step and the vehicle lamp in the front-rear direction,
The convex step internally reflects a part of the light internally reflected toward the front by the reflection surface of the reflection step toward the side of the vehicle lamp, and intersects with the extending direction of the light guide body. A second reflecting surface extending in the direction of the horizontal direction, and an emitting surface intersecting the second reflecting surface for deflecting and emitting the light reflected by the second reflecting surface in the lateral direction in the horizontal direction. With.

The “rod-shaped light guide” may be formed so as to extend in an inclined or curved manner in the up/down/left/right/front/back directions as long as it is arranged to extend in the up/down direction.

The “light source” may enter light from only one end face of the light guide, or may enter light from end faces of a plurality of branching parts of the light guide.

In another aspect of the present disclosure, the convex step is formed in a triangular pyramid shape that protrudes from the surface of the light guide body, and the second reflection surface and the emission surface are laterally adjacent to each other.
The convex step may be arranged such that an incident angle of the light, which is internally reflected toward the front side by the reflecting surface of the reflecting step, to the second reflecting surface is a critical angle or more.
The convex step may be arranged such that an incident angle of the light, which is internally reflected toward the lateral side by the second reflection surface, to the emission surface is less than a critical angle.

In another aspect of the present disclosure, the area of the second reflecting surface may be smaller than the area of the emitting surface.

In another aspect of the present disclosure, at least the front surface portion of the light guide body may be formed in an arc shape in horizontal cross section.
In the convex step, the second reflecting surface may be arranged inside the center axis of the light guide body in the vehicle width direction.

In another aspect of the present disclosure, the light guide body may be arranged so as to extend while being inclined in the front-rear direction.
The light source may be arranged such that the direction of the light internally reflected toward the front side by the reflection surface of the reflection step is the light guide direction of the light guide body.

In another aspect of the present disclosure, the light guide body has a shape that is convexly curved forward, and the curvature of the light guide body gradually increases from an upper end portion to a lower end portion of the light guide body. May be formed as follows.
The light source light may be configured to be incident from the upper end portion having the small curvature and extending horizontally behind the vehicular lamp.

In another aspect of the present disclosure, the vehicular lamp includes a pair of left and right lamp chambers extending in a V shape in a front view so as to sandwich a headlamp fixedly held by a vehicle body, and each of the lamp chambers includes the above-mentioned lamp chambers. It may be a motorcycle indicator light in which the light guide and the light source are respectively arranged.

According to the present disclosure, the convex step provided on the front surface of the light guide forms the deflected emitted light that is not influenced by the light guide direction and is directed to the lateral horizontal direction of the lamp, and the lateral horizontal direction of the lamp is achieved. The amount of polarized light emitted in the direction increases. Therefore, a vehicular lamp having excellent visibility from the side of the vehicle is provided.

FIG. 1A is a front view of a motorcycle clearance lamp that is a vehicle lamp according to an embodiment of the present disclosure. FIG. 1B is a front view of the same clearance lamp with the translucent cover removed. FIG. 2 is a horizontal sectional view of the lamp (enlarged sectional view taken along line II-II in FIG. 1A). FIG. 3 is a vertical sectional view of the lamp (a sectional view taken along line III-III in FIG. 1A). FIG. 4 is a front view of the light guide. FIG. 5 is a partially enlarged front view of the light guide. FIG. 6 is a partially enlarged left side view of the light guide body. FIG. 7 is a partially enlarged right side view of the light guide body showing the reflection step and the ridge step. FIG. 8A is an enlarged vertical sectional view of a light guide body showing a reflection surface of a reflection step. FIG. 8B is an enlarged horizontal cross-sectional view of the light guide, showing the optical path inside the light guide of the deflected outgoing light emitted from the ridge step. FIG. 9 is an enlarged perspective view of the light guide, showing the optical path inside the light guide of the deflected emitted light that is internally reflected by the second reflecting surface of the convex step and is emitted from the emitting surface. FIG. FIG. 10 is an exploded front view of the clearance lamp, and is a view for explaining the procedure of assembling the light guide unit and the translucent cover to the lamp body.

In Patent Document 1, the amount of light deflected and emitted from the emission surface of the convex step is small in the lateral horizontal direction of the lamp. The light source light of Patent Document 1 is internally reflected by a reflection step provided on the rear surface of the light guide body, and then further internally reflected by one emission surface of the convex step, and from the other emission surface opposite to the side of the lamp. The emitted light is largely deflected. Even if the emitted light is a light that is largely deflected to the side of the lamp, the light reflected on the inner surface in the reflecting step is () because the emitting surface of the convex step is parallel to the extending direction of the light guide. Upward) effect. Therefore, in Patent Document 1, since the emitted light is light that is directed upward in the lateral direction of the lamp, the amount of emitted light is small.

In the present disclosure, the convex step provided on the front surface of the light guide is formed in a triangular pyramid shape having a predetermined reflection surface and a predetermined emission surface. The predetermined reflecting surface internally reflects the light that is internally reflected toward the front in the reflection step of the rear surface of the light guide toward the side of the lamp and extends so as to intersect with the extending direction of the light guide. Exists The predetermined emission surface refracts and emits light internally reflected by the predetermined reflection surface in a predetermined lateral direction, and intersects the predetermined reflection surface. The shape of the convex step controls the light deflected and emitted from the emitting surface of the convex step in the lateral horizontal direction of the lamp without being influenced by the light guiding direction of the light guide body extending in the vertical direction. it can.

A prototype of a lamp equipped with a light guide having the above-described structure was tested, and when the polarized outgoing light directed to the lateral horizontal direction of the lamp formed by the convex step was verified, good results were obtained.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

FIG. 1A is a front view of a motorcycle clearance lamp 10 that is a vehicle lamp according to an embodiment of the present disclosure. FIG. 1B is a front view of the clearance lamp 10 with the translucent cover removed. 2 and 3 are sectional views taken along lines II-II and III-III of FIG. 1A, respectively, and FIG. 10 is an exploded front view of the clearance lamp 10.

As shown in these drawings, the vehicular lamp according to the present embodiment is a clearance lamp 10 provided at the front end of a motorcycle that is a vehicle. In the clearance lamp 10, a light guide unit 30 is incorporated into a lamp chamber S formed by a lamp body 12 and a transparent transparent cover 18 attached to the front surface side thereof.

The lamp body 12 is formed in a substantially V shape when viewed from the front. A pair of

light guide units

30, 30 are arranged on the front surface side of the lamp body 12. Each of the

light guide units

30, 30 is covered with a translucent cover 18 fixed to the lamp body 12 and having a substantially V shape in a front view. Each light guide unit 30 includes a light guide 34 that extends obliquely in the vertical direction and a light source 32 that causes light to enter the light guide 34 from an upper end surface 34c above the light guide 34. The light guide 34 is the light emitter of the clearance lamp 10.

As shown in FIGS. 1A and 1B, the clearance lamp 10 having a substantially V shape in a front view is arranged so as to sandwich a headlight (not shown) fixedly held by a vehicle body (not shown). A headlight (not shown) is exposed from a circular opening 52 provided at the center of a cowling 50 attached to a vehicle body (not shown). A part of the translucent cover 18 of the clearance lamp 10 in the longitudinal direction is exposed from the linear openings 54 provided in the left and right sides of the cowling 50 and extending in an oblique direction when viewed from the front (see FIG. 2 ).

In FIG. 2, the direction indicated by X is “front” (also “front” for the vehicle), and the direction indicated by Y is the “right direction” (the right direction when viewed from the driver), which is the inside in the vehicle width direction orthogonal to the “front”. )”.

The cowling 50 is curved so as to wrap around to the rear side toward the outer side in the vehicle width direction (the right side in FIG. 2, that is, the direction opposite to the Y direction).

The light guide 34 is a transparent synthetic resin molded product made of acrylic resin or the like. As shown in FIG. 3, the light guide 34 is inclined in the front-rear direction so as to be convex forward in a side view, and is inclined in the left-right direction in a front view as shown in FIG. The light guide 34 is configured as a rod-shaped light guide having an arc-shaped cross section (see FIG. 2) that extends in a three-dimensional curve in the front-rear, left-right, and up-down directions, and is formed by injection molding.

The light source 32 is a light emitting diode that emits white light. The light source 32 is supported by a light source support portion 36 (see FIG. 3) formed so as to extend downward on the upper back side of the lamp body 12. The light emitting surface of the light source 32 is arranged toward the upper end surface 34c of the light guide 34. Reference numeral 17 is an opening for light source light incidence, which is provided at a position corresponding to the upper end surface 34c of the light guide 34 above the rear surface of the lamp body 12.

The light guide unit 30 guides the light source light incident from the upper end surface 34 c of the light guide 34 to the lower end surface 34 d of the light guide 34 while repeating internal reflection on the inner peripheral surface of the light guide 34. The light guide unit 30 causes the light source light to be internally reflected toward the front by the reflection surface 42 of the reflection step 40 provided on the rear surface portion 34b of the light guide 34, and then from the front surface 34a of the light guide 34 toward the front. It is configured to be emitted.

The reflecting step 40 is formed parallel to the central axis L of the light guide 34, as shown in FIG. As shown in FIGS. 6 to 8, the reflection step 40 includes a plurality of light guide reflecting surfaces 41 for guiding the light source light incident on the light guide 34 and an inclination with respect to the central axis L of the light guide 34. A plurality of light distribution reflection surfaces 42 that are formed so as to be inclined with respect to the light guide reflection surface 41 and that reflect the light source light that has entered the light guide 34 in a forward predetermined direction are provided. The reflection steps 40 are formed in a sawtooth shape at equal pitches in the longitudinal direction of the light guide 34.

As shown in FIGS. 8A and 8B, each reflecting surface 42 internally reflects the light source light guided by the light guide 34 toward the front parallel to the longitudinal axis L1 of the clearance lamp 10. That is, the inclination of the reflection surface 42 of each reflection step 40 is adjusted in accordance with the posture (inclination of the central axis L) of the light guide 34 extending in a curved manner. The reflecting surface 42 of each reflecting step 40 is set so as to internally reflect the light source light toward the front parallel to the front-rear axis L1 of the clearance lamp 10, as indicated by reference numeral l-1.

As shown in FIG. 6, the reflection surface 42 of each reflection step 40 is adjusted so that the area of the reflection surface 42 becomes larger as the reflection step 40 is located farther from the upper end where the light source light enters. The reflecting surface 42 is configured so that light having the same intensity as possible is emitted forward from the front surface portion 34a over the entire area of the light guide 34 in the longitudinal direction.

As shown in FIG. 2, the light 1-1 that has been internally reflected forward by the reflecting surface 42 of the reflecting step 40 is emitted from the front surface portion 34a of the light guide 34, for example, to an irradiation range A1 of 45 degrees in the vehicle front left and right direction. To be done. The irradiation range A1 of the light 1-1 emitted from the front surface portion 34a of the light guide body 34 is adjusted by changing the width of the reflection surface 42 of the reflection step 40.

As shown in FIGS. 2 to 9, at the position corresponding to the plurality of reflection steps 40 on the front surface portion 34a of the light guide 34, a plurality of ridge steps 45 are provided at equal pitches in the longitudinal direction. Each ridge step 45 uses a part of the light l-1 internally reflected by the reflecting surface 42 of the reflecting step 40 as the deflected outgoing light l-3 and outputs a predetermined irradiation range in the vehicle width direction outer horizontal direction (vehicle width direction outer side). The light is emitted to A2 (range of 45 degrees to 80 degrees).

Each ridge step 45 includes a second reflecting surface 46 and an emitting surface 48. The second reflecting surface 46 is inclined with respect to the front-rear axis L1 of the clearance lamp 10 and laterally internally reflects the light 1-1 that is internally reflected forward by the reflecting surface 42 of the reflecting step 40. The emission surface 48 refracts and emits the light 1-2 that is internally reflected by the second reflection surface 46. As shown in FIGS. 7 and 9, each ridge step 45 is formed in a triangular pyramid shape on the arc-shaped front surface portion 34 a of the light guide 34. The reflecting surface 46 and the emitting surface 48 are arranged adjacent to each other on the left and right.

Since the reflecting step 40 and the convex step 45 are integrally molded when the light guide 34 is injection-molded, both

steps

40 and 45 can be easily formed. In consideration of the releasability after injection molding, the ridge step 45 is formed with a smooth curved ridgeline region of the triangular pyramid, as shown in FIG.

In the second reflecting surface 46 of the convex step 45, the incident angle θ1 of the light l-1 internally reflected forward by the reflecting surface 42 of the reflecting step 40 on the second reflecting surface 46 is not less than the critical angle θa. The inclination of the second reflecting surface 46 is adjusted so that the light emitting surface 48 reflects the light 1-2 which is internally reflected by the second reflecting surface 46 in a predetermined lateral direction to the emitting surface 48. The inclination of the emission surface 48 is adjusted so that the incident angle θ2 is less than the critical angle θa. Therefore, most of the light 1-1 that is internally reflected by the reflecting surface 42 of the reflecting step 40 and is incident on the second reflecting surface 46 of the convex step 45 is the deflected outgoing light l− from the outgoing surface 48 of the convex step 45. It is emitted as 3.

The second reflection surface 46 and the emission surface 48 of each convex step 45 are so arranged that the deflected emission light 1-3 emitted from the emission surface 48 is directed to the irradiation range A2 of 45 degrees to 80 degrees outside the vehicle width direction in the horizontal direction. In addition, the inclination of the central axis L of the light guide 34 and the longitudinal axis L1 of the clearance lamp 10 is adjusted.

In this manner, from the front surface portion 34a of the light guide body 34 in which the convex streak step 45 is formed, to a wide horizontal irradiation range A1, A2 (see FIG. 2) from the vehicle width direction inner side 45 degrees to the vehicle width direction outer side 80 degrees. , The light is emitted and distributed.

The area of the second reflecting surface 46 of the convex step 45 is larger than the area of the emitting surface 48 so that the efficiency of forming the deflected outgoing light 1-3 toward the lateral direction of the clearance lamp 10 by the convex step 45 is increased. It is formed small.

In the convex step 45, the second reflecting surface 46 has an arcuate cross section so that the light quantity of the deflected outgoing light 1-3 toward the horizontal horizontal range A2 (see FIG. 2) of the clearance lamp 10 increases. It is arranged so as to be inside the center axis L of the light guide 34 in the width direction of the vehicle.

All of the pair of left and right light guides 34, 34 forming the pair of left and right light guide units 30 are formed symmetrically including the reflection step 40 and the convex step 45, and the

light sources

32, 32 are also arranged symmetrically. ing. Therefore, also in the light guide unit 30 on the left side in the front view, the lights l-1, l are distributed from the front surface portion 34a of the light guide 34 to a wide area in the horizontal direction from 45 degrees inside the vehicle width direction to 80 degrees outside the vehicle width direction. -3 is emitted and distributed.

The pair of left and right light guides 34, 34 have the same configuration in which the light beams 1-1 and 1-3 are emitted in the range of 45 degrees inside the vehicle width direction to 80 degrees outside the vehicle width direction. The light guide 34 on the right side in the view will be described, and the detailed description of the light guide 34 on the left in the front view will be omitted.

As shown in FIGS. 3, 4 and 10,

brackets

35A and 35B for attaching the light guide 34 to the lamp body 12 are integrally formed at both upper and lower ends of the light guide 34, respectively.

As shown in FIG. 10, the lamp body 12 has a pair of left and right strip-shaped

inclined regions

13, 13 extending at an angle of about 60 degrees with respect to the horizontal when viewed from the front, and the lower ends thereof are connected by a strip-shaped horizontal region 14. It is formed in an integrated, substantially V-shape. As shown in FIG. 3, the pair of

inclined regions

13, 13 are each formed in a curved shape whose longitudinal cross section follows the curved shape of the light guide 34. A bulging portion 18 a having a shape that follows the curved shape of the light guide 34 is formed in a region of the translucent cover 18 corresponding to the light guide 34. As shown in FIG. 2, the inner peripheral surface of the bulging portion 18a is subjected to, for example, knurling or crystal cutting, so that the light guide 34 cannot be seen through the translucent cover 18 and is bulged. Light emitted from the portion 18a is diffused. Reference numeral 19a in FIG. 2 indicates a knurled processing area, and reference numeral 19b indicates a crystal cut processing area.

Band-shaped brackets 15 extending in the left-right direction are integrally formed at the upper ends of the pair of

inclined regions

13, 13, and band-shaped brackets 16 are integrally formed outside the lower positions of the

inclined regions

13, 13, respectively. There is.

A light guide support portion 15A having a size corresponding to the upper bracket 35A of the light guide 34 is formed on the bracket 15, and a light source support portion 36 for disposing the light source 32 is provided on the back side of the light guide support portion 15A. Are integrally formed. The light guide support portion 15A is provided with an opening 17 for allowing the light emission of the light source 32 supported by the light source support portion 36 to enter the upper end surface 34c of the light guide 34.

In the horizontal area 14 of the lamp body 12, a light guide support portion 14B having a size corresponding to the lower bracket 35B of the light guide 34 is formed.

The

brackets

35A and 35B of the light guide 34 are provided with

screw insertion holes

35a and 35b, and the light

guide support portions

15A and 14B of the lamp body 12 are also provided with

screw insertion holes

15a and 14b. The light guide 34 is fixedly integrated with the front surface side of the lamp body 12 by a fixing screw 38 (see FIG. 1B).

The

brackets

15 and 16 are provided with

screw insertion holes

15c and 16c, and the clearance lamp 10 is fixed to the front side of the vehicle body by a fixing screw (not shown).

As shown in FIG. 3 which is a side view of the light guide 34, the left and right extending

brackets

35A, 35B provided on the light guide 34 are formed in parallel, and the horizontal region 14 of the lamp body 12 and the

bracket

15, 16 is also formed in parallel. Therefore, in the present embodiment, first, the light guide 34 can be easily assembled to the front surface side of the lamp body 12. Secondly, in the present embodiment, the lamp mounting surface (not shown) provided at a predetermined position on the front side of the vehicle body is engaged with the

brackets

15 and 16 on the clearance lamp 10 side from the front side of the vehicle body to move from the front side to the rear side of the vehicle body. The clearance lamp 10 can be easily assembled to the vehicle body by inserting the fixing screw toward the

screw insertion holes

15c and 16c.

Next, the procedure for assembling the clearance lamp 10 will be described with reference to FIG.

First, the light source 32 is fixed to the light source support portion 36 of the lamp body 12. The

brackets

35A and 35B of the light guide body 34 are arranged so as to be aligned with the light guide

body support portions

15A and 14B of the lamp body 12, and further the fixing screws 38 are inserted into the

screw insertion holes

35a and 35b; 15a and 14b. The

brackets

35A and 35B are fixed to the light

guide support portions

15A and 14B of the lamp body 12. FIG. 1B shows a state where the light guide unit 30 is fixed to the lamp body 12.

Next, the translucent cover 18 is assembled and fixed to the front surface side of the lamp body 12 so as to cover the entire light guide 34 including the

brackets

35A and 35B, so that the clearance lamp 10 is integrated as shown in FIG. 1A. Formed. The translucent cover 18 may be fixed to the lamp body 12 by a concave-convex lance engagement, welding, adhesion, or any other fixing method.

After the clearance lamp 10 is fixed to a predetermined position on the front surface side of the vehicle body with a screw, the cowling 50 is fixed to the front surface of the vehicle body so that the headlight (not shown) fixed to the vehicle body has a circular opening 52 of the cowling 50. Stick out from. As shown in FIG. 2, a predetermined vertical region of the bulging portion 18 a of the translucent cover 18 projects from the linear opening 54 provided in the cowling 50 and is exposed in the linear opening 54. Thus, the emitted light is irradiated (light distribution) on a wide area in the horizontal direction from 45 degrees inside to 80 degrees outside in the vehicle width direction.

Next, the operation and effect of this embodiment will be described in detail with reference to FIGS.

In the present embodiment, as shown in FIGS. 2, 8A and 8B, the light source light 1-1 is incident on the light guide 34 and reflected by the reflection step 40 provided on the rear surface portion 34 b of the light guide 34. The surface 42 is internally reflected toward the front. The reflected light source light 1-1 is emitted as diffused light from the front surface portion 34a of the light guide 34 to the irradiation range A1 (see FIG. 2) in the front left and right directions of the clearance lamp 45 of 45 degrees.

A part of the light source light 1-1 which is internally reflected forward by the reflection surface 42 of the reflection step 40 extends in the light guide 34 of the convex step 45 provided at a position directly facing the reflection step 40. The second reflection surface 46 extending in the direction intersecting the direction controls the internal reflection light 1-2 toward the predetermined side direction of the clearance lamp 10 in which the influence of the light guide direction is mitigated. When the controlled internal reflection light 1-2 is further emitted from the emission surface 48 that intersects with the second reflection surface 46, the influence of the light guide direction is further reduced in the lateral horizontal direction of the clearance lamp 10. It is controlled by the deflected outgoing light 1-3.

More specifically, the reflection surface 42 of the reflection step 40 provided on the rear surface portion 34b of the light guide 34 allows the light source light guided by the light guide 34 to pass through the front and rear of the clearance lamp 10, as shown in FIGS. 8A and 8B. The inner surface is reflected toward the front parallel to the axis L1. At the time of reflection, the reflection surface 42 internally reflects the light l-1 affected by the light guide direction to the front. Therefore, the second reflecting surface 46 of the convex step 45 is affected not only by the light adjusted parallel to the front-rear axis L1 of the clearance lamp 10 but also by the light guiding direction (downward) of the light guide 34. Light is also guided. That is, the light 1-1 that is internally reflected forward by the reflecting surface 42 of the reflecting step 40 and guided to the second reflecting surface 46 of the convex step 45 is affected by the light guiding direction to a considerable extent. Light.

However, as shown in FIG. 8A, FIG. 8B, and FIG. 9, the second reflecting surface 46 of the convex step 45 inclined with respect to the front-rear axis L1 of the clearance lamp 10 extends in the extending direction of the light guide body 34 (the central axis L ) Extends in the direction intersecting with. The second reflecting surface 46 is inclined and faces the light guide direction (downward) of the light guide 34. Therefore, since the second reflecting surface 46 is inclined with respect to the extending direction (center axis L) of the light guide 34, the second reflecting surface 46 is directed laterally in the direction of the internal reflected light 1-2. The light guiding direction of the light guiding body 34 (downward, indicated by reference numeral A in FIG. 9) and the opposite direction (upward, indicated by reference numeral B in FIG. 9) are corrected, and the light guiding direction of the light guiding body 34 (downward, FIG. 9). (Indicated by the symbol A) of the above) on the inner surface reflected light 1-2.

Furthermore, when the emission surface 48 of the convex step 45 emits the internal reflection light 1-2 of the second reflection surface 46, the light guide direction of the light guide 34 (downward, indicated by reference symbol A in FIG. 9). The light is refracted (corrected) in the opposite direction (upward, indicated by reference numeral B in FIG. 9) to the deflected outgoing light 1-3 in the light guide direction of the light guide 34 (downward, indicated by reference numeral A in FIG. 9). Alleviate the impact.

Especially, the light guide 34 is arranged so as to extend while being inclined in the left-right direction when viewed from the front. Further, since the light source light is incident from above the light guide 34 to below, the light l-1 internally reflected forward by the reflection surface 42 of the reflection step 40 is obliquely moved by the convex step 45 with respect to the light guide direction. It is necessary to control so that the light is deflected and emitted in the horizontal direction, which is the opposite direction, that is, 45 degrees inside the vehicle width direction and 80 degrees outside. In the present embodiment, by adjusting the inclinations of the second reflecting surface 46 and the emitting surface 48 of the convex step 45 with respect to the front-rear axis L1 of the clearance lamp 10 and the central axis L of the light guide 34, the light 1-1 is adjusted. You can control.

As described above, according to the present embodiment, the convex step 45 provided on the front surface portion 34 a of the light guide body 34 reduces the influence of the light guide direction and deflects the clearance lamp 10 in the lateral horizontal direction. Emitted light 1-3 is formed. Since the amount of deflected light emitted in the lateral direction of the clearance lamp 10 increases, the visibility of the clearance lamp 10 from the vehicle side becomes particularly good.

The light l-1 emitted from the front surface portion 34a of the light guide 34 in a wide range of 45 degrees in the front and left directions of the clearance lamp 10 includes light affected by the light guide direction (downward). However, the amount of light emitted from the front surface portion 34a of the light guide 34 is overwhelmed as compared with the amount of deflected emitted light l-3 that uses only a part of the light l-1 reflected forward by the reflection surface 42 of the reflection step 40. In view of the fact that the clearance lamp 10 is visible from the front of the vehicle, there is no problem.

In the present embodiment, the convex step 45 projects from the surface of the light guide 34, and is formed in a triangular pyramid shape in which the second reflecting surface 46 and the emitting surface 48 are laterally adjacent to each other. As shown in FIG. 8B, the incident angle θ1 of the light l-1 internally reflected forward by the reflecting surface 42 of the reflecting step 40 on the second reflecting surface 46 is set to the critical angle θa or more, and The incident angle θ2 of the light 1-2 that is internally reflected in the predetermined direction laterally of the clearance lamp 10 at the second reflecting surface 46 on the emission surface 48 is set to be less than the critical angle θa. Therefore, the light amount of the deflected outgoing light 1-3 in the lateral direction of the clearance lamp 10 by the convex step 45 increases.

Most of the light 1-1 that is internally reflected by the reflecting surface 42 of the reflecting step 40 and is incident on the second reflecting surface 46 of the convex step 45 is internally reflected toward the predetermined lateral direction of the clearance lamp 10. Most of the light 1-2 that is internally reflected by the second reflection surface 46 of the convex step 45 and enters the emission surface 48 is directed from the emission surface 48 of the convex step 45 to the lateral horizontal direction of the clearance lamp 10. It is deflected and emitted. As a result, the efficiency with which the convex step 45 forms the deflected outgoing light l-3 toward the lateral horizontal direction of the clearance lamp 10 is increased, and the amount of the polarized outgoing light directed toward the lateral horizontal direction of the clearance lamp 10 increases. The visibility of the clearance lamp 10 from the side of the vehicle is improved.

Since the convex step 45 has a triangular pyramid shape protruding from the surface of the light guide 34, it is easy to integrally form the convex step 45 on the light guide 34 so as to face the reflection step 40. By forming the reflection step 40 and the convex step 45 integrally when molding the light guide 34, the manufacturing process of the light guide 34 does not become complicated.

In this embodiment, the area of the second reflecting surface 46 is formed smaller than the area of the emitting surface 48. As a result, almost all of the light 1-2 that is internally reflected by the second reflection surface 46 is emitted from the emission surface 48 as the deflected emission light 1-3 that is directed to the lateral direction of the clearance lamp 10. Therefore, the efficiency of forming the deflected emitted light 1-3 toward the lateral direction of the clearance lamp 10 by the convex step 45 is increased, and the visibility of the clearance lamp 10 from the side of the vehicle is improved.

In the present embodiment, the convex step 45 is arranged such that the second reflecting surface 46 is on the inner side in the vehicle width direction with respect to the central axis L of the light guide 34. Therefore, the light amount of the deflected emission light 1-3 in the predetermined range in the lateral direction of the clearance lamp 10 (the range of 45 degrees to 80 degrees outside the vehicle width direction) increases, and the clearance lamp 10 is visually recognized from the side of the vehicle. The sex is enhanced.

The front surface 34a of the light guide 34 has an arcuate horizontal cross section. When the second reflecting surface 46 of the convex step 45 is arranged outside the center axis L of the light guide 34 in the width direction of the vehicle, the deflected outgoing light emitted from the outgoing surface 48 of the convex step 45. Is light that goes toward the rear side of the vehicle more than necessary. As a result, the amount of deflected emitted light in the range of 45 degrees to 80 degrees outside the vehicle width direction may decrease, and may exceed the outside 80 degrees in the vehicle width direction specified by law.

However, in the present embodiment, the second reflecting surface 46 is arranged inside the center axis L of the light guide 34 in the vehicle width direction. Therefore, it is possible to control the deflected emission light 1-3 emitted from the emission surface 48 of the convex step 45 so as to be emitted in a predetermined lateral horizontal range of the vehicle (45 degrees to 80 degrees outside the vehicle width direction). As a result, in the present embodiment, the amount of deflected emitted light in a predetermined range in the lateral horizontal direction is increased, and the visibility of the clearance lamp 10 from the vehicle side can be enhanced.

In addition, in the present embodiment, most of the region above the light guide 34 is arranged so as to extend while tilting backward. Further, the light source 32 is arranged so that the direction of the light 1-1 that is internally reflected toward the front by the reflection surface 42 of the reflection step 40 is the forward direction with respect to the light guide direction of the light guide 34.

▽The upper region of the light guide 34 extends so as to incline backward. If the light source light is incident on the light guide 34 from below, the reflection surface 42 of the reflection step 40 provided in the rearwardly inclined region of the light guide 34 is in the opposite direction to the light guide direction of the light guide 34. It is necessary to internally reflect the light from the light source toward the front.

In the case where the reflection surface of the reflection step is adopted as the configuration in which the light source light is internally reflected on the rear surface portion 34b of the light guide body 34 where the light source light enters from the lower end surface 34d toward the front opposite to the light guide direction. There is. In this case, it is difficult to internally reflect the light having the intensity that can be used as the light distribution toward the front, and the visibility of the lamp from the front and the side of the vehicle is reduced.

However, in the present embodiment, with respect to the light guide 34 that extends so as to incline largely backward, the direction of the light source light that is internally reflected by the reflection surface 42 of the reflection step 40 is the forward direction with respect to the light guide direction. The light from the light source is made incident on the light guide 34 from above. Even if the above structure (the reflecting surface 42 of the reflecting step 40) is adopted, according to the present embodiment, it is possible to internally reflect the light having sufficient intensity that can be used as the light distribution toward the front side of the vehicle. The visibility of the clearance lamp 10 from the side does not deteriorate.

Instead of the reflection step 40 used in the present embodiment, for example, the configuration of the reflection step disclosed in Prior Patent Document 1 and other reflection steps may be adopted.

In the present embodiment, the light guide 34 has a shape that is convexly curved forward, and is formed so that the curvature of the light guide 34 gradually increases from the upper end to the lower end. Further, the light guide body 34 is configured such that the light source light is incident from the upper end side of the light guide body 34, which extends rearward substantially horizontally and has a small curvature.

The larger the curvature of the light guide 34, the more light leaks from the light guide 34, and the smaller the curvature, the less light leaks from the light guide 34. Therefore, in the present embodiment, the light source light can be guided to the lower end portion side of the light guide body 34 by allowing the light source light to enter from the upper end portion side of the light guide body 34 that extends substantially horizontally rearward and has a small curvature.

As a result, the present embodiment can provide the clearance lamp 10 that is equipped with the light guide 34 that is curved in a forward convex shape and that is excellent in visibility from the front and side of the vehicle.

In the present embodiment, for a motorcycle, the light guide unit 30 (the light guide 34 and the light source 32) is arranged in each of a pair of left and right lamp chambers S that extend in a substantially V shape in front view so as to sandwich the headlight. The present disclosure is applied to the clearance lamp 10 of FIG. The entire light guide 34 extending in a V-shape across the headlight emits light, and the amount of deflected light emitted in the lateral direction of the vehicle increases, which is excellent in visibility from the side of the vehicle. Marking lights for motorcycles are provided.

Also, the present disclosure is not limited to the configurations described in the above embodiments, and configurations with various other changes may be adopted.

For example, in the above-described embodiment, the light-emitting diode is used as the light source 32, but it is also possible to use a light source of another type.

In the above embodiment, the light guide 34 is arranged so as to extend in a three-dimensional curve, but the light guide 34 may be arranged to extend in a straight line.

In the above-described embodiment, the light source light is configured to enter the light guide body 34 from the upper end surface 34c of the light guide body which is arranged in the up-down direction and which is largely curved forward convexly. However, the direction (front) of the source light internally reflected by the reflection surface 42 for light distribution of the reflection step provided on the rear surface portion 34b of the light guide 34 is such that the degree of bending of the light guide 34 is small. On the other hand, when not in the opposite direction, the light source 32 may be configured such that the light source light enters the light guide 34 from the lower end surface 34 d of the light guide 34.

The light source 32 is configured such that the light source light is incident not on the upper end surface 34c or the lower end surface 34d above or below the light guide body 34 but on the end surface of the branched portion above or below the light guide body 34. Good.

In the above-described embodiment, the clearance lamp 10 which is a marker light for motorcycles has been described. Other marker lights for motorcycles, clearance lamps for automobiles and other marker lights for automobiles, and also for automobiles in which a light source unit for headlamps and a light guide for clearance lamps are integrally housed in the lamp chamber. The embodiment is also applied to the lighting.

This application claims priority based on Japanese application No. 2019-021129 filed on February 8, 2019, and incorporates all the contents described in the Japanese application.

Claims

A vehicular lamp including a rod-shaped light guide arranged in the lamp chamber so as to extend in the up-down direction, and a light source that makes light source light incident in the up-down direction of the light guide,
The light guide includes a reflection step provided on a rear surface portion of the light guide body and a convex step provided on a front surface portion of the light guide body,
In the reflecting step, the light source light that has entered the light guide body is internally reflected to be emitted from the front surface portion of the light guide body to the front of the vehicular lamp,
The convex step is at a position facing the reflecting step and the vehicle lamp in the front-rear direction,
The convex step internally reflects a part of the light internally reflected toward the front by the reflection surface of the reflection step toward the side of the vehicle lamp, and intersects with the extending direction of the light guide body. A second reflecting surface extending in the direction of the horizontal direction, and an emitting surface intersecting the second reflecting surface for deflecting and emitting the light reflected by the second reflecting surface in the lateral direction in the horizontal direction. A vehicle lamp including:
The convex step protrudes from the surface of the light guide, and the second reflecting surface and the emitting surface are formed in a triangular pyramid shape that is adjacent to each other on the left and right.
The convex step is arranged so that an incident angle of the light internally reflected toward the front side on the reflecting surface of the reflecting step to the second reflecting surface is a critical angle or more,
The vehicle according to claim 1, wherein the convex step is arranged such that an incident angle of the light internally reflected toward the side by the second reflecting surface toward the emitting surface is less than the critical angle. Lighting equipment.
The vehicle lamp according to claim 1 or 2, wherein the area of the second reflecting surface is smaller than the area of the emitting surface.
At least the front surface portion of the light guide body is formed in an arc shape in horizontal cross section,
The vehicular lamp according to any one of claims 1 to 3, wherein the convex step is arranged such that the second reflecting surface is located inside the center axis of the light guide body in the vehicle width direction. ..
The light guide is arranged so as to extend while being inclined in the front-rear direction,
5. The light source is arranged according to any one of claims 1 to 4, wherein the light source is arranged such that a direction of light internally reflected toward the front side by the reflection surface of the reflection step is a light guide direction of the light guide body. The vehicle lighting described.
The light guide has a shape that is convexly curved forward, is formed such that the curvature of the light guide gradually increases from the upper end to the lower end of the light guide, and is horizontally The vehicular lamp according to any one of claims 1 to 5, wherein the light source light is incident from the upper end portion having a small curvature and extends rearward of the vehicular lamp.
The vehicular lamp includes a pair of left and right lamp chambers extending in a V-shape when viewed from the front so as to sandwich a headlamp fixedly held by the vehicle body, and the light guide and the light source are provided in each lamp chamber. The vehicular lamp according to any one of claims 1 to 6, wherein the vehicular lamp is a placed marker light for motorcycles.