JP6868974B2 - Light fixtures for vehicles - Google Patents

Description

The present invention relates to a technical field of a vehicle lamp having a light guide body that guides light emitted from a light source.

Japanese Unexamined Patent Publication No. 2013-171658

In a vehicle lamp, for example, a light source and a light guide are arranged inside a lamp outer housing composed of a cover and a lamp housing, and the light emitted from the light source is guided by the light guide to the exit surface of the light guide. There is a type that is irradiated from to the outside.

The light guide body is generally formed in a shape extending in a predetermined direction. A light source is arranged at a position facing the incident surface of the light guide, the light emitted from the light source is incident from the incident surface, and the incident light is internally reflected and guided in the extending direction of the light guide and the inner surface. At least part of the reflected light is emitted from the exit surface.

Such a light guide body is formed in various shapes according to the shape of a vehicle or a lamp for a vehicle, and is provided as a partially bent bent portion (see, for example, Patent Document 1).

The vehicle lamp described in Patent Document 1 is provided with a bent portion bent by approximately 90 °, one end surface in the longitudinal direction is formed as an incident surface, and a light source is arranged at a position facing the incident surface. ing.

By the way, in the light guide body having the bent portion as described above, the direction in which the light is internally reflected at the bent portion is changed with respect to the other portion to change the light guide direction, so that the light is emitted from the bent portion. The amount of light emitted may increase or decrease with respect to other parts, or the direction of light emitted from the bent portion may differ.

Therefore, in the light guide body having the bent portion, the brightness unevenness is likely to occur due to the increase / decrease in the amount of light and the change in the emission direction.

Therefore, it is an object of the present invention for vehicle lamps to overcome the above-mentioned problems and to control the light emitted from the exit surface of the bent portion to suppress the occurrence of luminance unevenness in the light guide body.

The vehicle lighting equipment according to the present invention has an incident surface that incidents light emitted from a light source, a reflecting surface that internally reflects light incident from the incident surface, and an emitting surface that emits light internally reflected by the reflecting surface. A light fixture for a vehicle provided with a light guide body having the above, wherein the light guide body is provided with a light guide portion having a substantially circular shape or a substantially oval shape in cross section orthogonal to the longitudinal direction. The light guide portion is provided with a bent portion in which at least a part of the exit surface is formed and bent in a predetermined state, and an optical control step is formed at one end of the light guide portion in the longitudinal direction to form the bent portion. A step forming portion having a degree of bending smaller than that of the portion is provided, at least a part of the light controlled by the optical control step is emitted from the exit surface of the bending portion, and a diffusion step is formed as the optical control step. In the step forming portion, the light incident from the incident surface is internally reflected by the light control step and guided toward the bent portion while being diffused, and the light guide body is continuously connected to the bent portion and the bent portion. A plate-shaped portion is provided to which light transmitted through the surface is incident, and the plate-shaped portion has a curved end face in the traveling direction of the light incident from the bent portion, and the plate-shaped portion extends from the bent portion. It is formed in a substantially flat plate shape that protrudes from the end of the protruding portion on the bent portion side and is thinner than the light guide portion .

As a result, the light is controlled by the light control step formed in the step forming portion where the degree of bending is smaller than that of the bending portion, and the light controlled by the optical control step is emitted from the exit surface of the bending portion. In addition, the light incident from the incident surface is diffused by the diffusion step, and the amount of light emitted from the exit surface of the step forming portion increases. Further, the light directed from the bent portion to the plate-shaped portion is easily emitted from the plate-shaped portion by the curved surface, and the amount of light reflected on the inner surface of the plate-shaped portion is reduced.

In the vehicle lamp according to the present invention described above, the first portion continuous with the step forming portion is formed in a curved shape bent so as to be substantially upwardly convex, and the first portion is formed. It is desirable that the second portion continuous with the portion is formed in a curved shape bent so as to be substantially downwardly convex.

In the vehicle lamp according to the present invention described above, the step forming portion and the bending portion are continuously provided in the traveling direction of the light, and the light is guided to the inner peripheral portion of the bending portion by the light control step. Is desirable.

As a result, the amount of light guided to the inner peripheral portion of the bent portion increases, so that the light emitted from the outer peripheral side and the inner peripheral side of the bent portion is made uniform.

According to the present invention, the light is controlled by the light control step formed in the step forming portion where the degree of bending is smaller than that of the bending portion, and the light controlled by the optical control step is emitted from the exit surface of the bending portion. It is possible to control the light emitted from the exit surface of the bent portion to suppress the occurrence of uneven brightness in the light guide body.

2 to 17 show an embodiment of the vehicle lamp of the present invention, and this figure is a horizontal sectional view of the vehicle lamp. It is a perspective view of a light guide body. It is an enlarged perspective view of a step forming part. FIG. 5 is an enlarged cross-sectional view taken along the line IV-IV of FIG. It is a figure which shows the state which diffused light is emitted from a bent part. It is a figure which shows the state which the light is reflected by the 2nd end portion of a plate-shaped portion, and is emitted from the region portion. It is a figure which shows the state which light is emitted from the curved surface of a plate-shaped part. A light guide body according to a modified example is shown together with FIGS. 9 to 12, and this figure is a front view. FIG. 8 is an enlarged cross-sectional view taken along the line IX-IX of FIG. It is a figure which shows the optical path in the enlarged sectional view along the X-ray line of FIG. It is an enlarged perspective view which shows the bent part and the like. 11 is an enlarged cross-sectional view taken along the line XII-XII of FIG. 14 to 17 show a light guide body when the end portion is not shielded by the extension, and this figure is a diagram showing an optical path when a diffusion step is not formed on the exit surface. It is a figure which shows the optical path when a diffusion step is formed on an exit surface. It is a front view which shows the example which the cylindrical step was formed as a diffusion step. It is a front view which shows the example which another cylindrical step was formed as a diffusion step. It is a front view which shows the example which the fisheye step was formed as a diffusion step.

Hereinafter, embodiments for carrying out the vehicle lamps of the present invention will be described with reference to the accompanying drawings.

In the embodiment shown below, the vehicle lamp of the present invention is applied to a clearance lamp. The scope of application of the present invention is not limited to clearance lamps, and head lamps, tail lamps, turn signal lamps, stop lamps, daytime running lamps, cornering lamps, hazard lamps, position lamps, back lamps, fog lamps, etc., or these. It can be widely applied to various vehicle lamps such as combination lamps which are a combination of the above.

The vehicle lamps 1 are attached and arranged at both left and right ends of the front end of the vehicle body, respectively.

The vehicle lamp 1 includes a lamp housing 2 having an opening in the front and a cover 3 that closes the opening of the lamp housing 2 (see FIG. 1). The lamp housing 2 and the cover 3 form a lamp outer housing 4, and the internal space of the lamp outer housing 4 is formed as a lamp chamber 5.

In the light chamber 5, an extension 6 formed in an annular shape and a light guide body 7 partially covered with the extension 6 are arranged.

The space inside the extension 6 is formed as a transmission hole 6a.

The light guide body 7 is formed of a transparent material (see FIG. 2), and the light guide portion 8 extending in the direction along the cover 3 and the attached portions 9 and 9 protruding from both ends in the longitudinal direction of the light guide portion 8, respectively. It has a plate-shaped portion 10 protruding from a part of the light guide portion 8.

The light guide body 7 is arranged in the light chamber 5 by attaching the attached portions 9 and 9 to a mounting member (not shown) arranged in the light chamber 5 or a lamp housing 2 by screwing or the like.

The light guide portion 8 is formed in a substantially circular shape or a substantially oval shape in a cross-sectional shape orthogonal to the longitudinal direction (see FIGS. 2 and 3).

Reflection steps 8a, 8a, ... Are formed on the outer peripheral surface of the light guide portion 8 on the lamp housing 2 side, and the portion where the reflection steps 8a, 8a, ... Are formed is formed as the reflection surface 11. (See FIGS. 3 and 4).

Diffusion steps 8b, 8b, ... Are continuously formed in the light guide portion 8 in the circumferential direction except for both ends in the longitudinal direction (see FIGS. 2 and 4). The diffusion steps 8b, 8b, ... Are formed on, for example, substantially half of the outer peripheral surface of the light guide portion 8 on the cover 3 side. The diffusion steps 8b, 8b, ... Are continuously formed in the circumferential direction.

The diffusion steps 8b, 8b, ... Have a function of internally reflecting light and guiding it in the longitudinal direction while diffusing it, and are formed in, for example, a cylindrical step. However, since the light guided inside the light guide unit 8 is emitted to the cover 3 side depending on the incident angle with respect to the diffusion steps 8b, 8b, ..., The light guided through the light guide unit 8 is abbreviated as the cover 3 side on the outer peripheral surface of the light guide unit 8. The half portion functions as an exit surface 12.

As shown in FIG. 2, the light guide portion 8 is provided with one end in the longitudinal direction as a step forming portion 13, a portion continuous with the step forming portion 13 as a bending portion 14, and a step forming portion in the bending portion 14. A continuous portion on the opposite side of 13 is provided as an extension portion 15.

The step forming portion 13 is formed in a substantially straight line extending in the substantially front-rear direction, and the tip surface is formed as an incident surface 13a. Optical control steps 13b, 13b, ... Are continuously formed in the circumferential direction on the outer peripheral surface of the step forming portion 13 (see FIG. 3). The optical control step 13b is formed in a concave shape extending in the longitudinal direction of the step forming portion 13, for example.

The optical control step 13b is a diffusion step, and is formed in, for example, a cylindrical step. The light incident from the incident surface 13a in the step forming portion 13 is internally reflected by the light control steps 13b, 13b, ..., And is guided toward the bent portion 14 while being diffused.

As shown in FIG. 2, the bent portion 14 is formed in a curved shape bent in a state of being bent by substantially 90 ° so that, for example, the first portion 14a continuous with the step forming portion 13 is substantially upwardly convex. The second portion 14b continuous with the first portion 14a is formed in a curved shape bent in a state of being bent by substantially 90 ° so as to be substantially downwardly convex. Therefore, the degree of bending of the step forming portion 13 is smaller than that of the bending portion 14.

The extending portion 15 is formed in a substantially linear shape, and is provided as the longest formed portion in the light guide portion 8.

The attached portions 9 and 9 project from both ends of the light guide portion 8 in the longitudinal direction. The attached portions 9 and 9 are shielded by the extension 6 together with the step forming portion 13 and the tip portion of the extending portion 15 (see FIG. 1).

The plate-shaped portion 10 protrudes from the bent portion 14 and the end portion of the extending portion 15 on the bent portion 14 side, and is formed in a substantially flat plate shape having a thickness thinner than that of the light guide portion 8 (see FIGS. 2 and 4). ). The tip portion of the plate-shaped portion 10 is composed of a first end portion 16 substantially parallel to the extension portion 15 and a second end portion 17 connecting one end of the first end portion 16 and the extension portion 15. .. The tip surface of the second end 17 is formed as an outwardly convex curved surface 17a (see FIG. 4).

In the light chamber 5, the light source 18 is arranged at a position facing the incident surface 13a of the step forming portion 13 (see FIG. 5). As the light source 18, for example, a light emitting element such as an LED (Light Emitting Diode) is used. In the vehicle lamp 1, the tip surface of the extending portion 15 may be formed as an incident surface, and the light source may be arranged at a position facing the incident surface of the extending portion 15.

In the vehicle lamp 1 configured as described above, when light is emitted from the light source 18, the emitted light is incident from the incident surface 13a of the step forming portion 13. The incident light is internally reflected by the light control steps 13b, 13b, ..., And is guided toward the bent portion 14 while being diffused. Since light is diffused and guided to the bent portion 14, the incident angle with respect to each surface of the bent portion 14 is large, the amount of light emitted from the emitting surface 12 is large (see FIG. 5), and the brightness of the bent portion 14 is increased. The decrease is suppressed.

On the other hand, when the light control steps 13b, 13b, ... Are not formed on the bent portion, the light incident from the incident surface 13a is along the step forming portion 13 as shown by the light P shown in FIG. It is easy to proceed, the number of times of internal reflection at the bent portion 14 is small, and the incident angle of the bent portion 14 with respect to each surface is also likely to be small. Therefore, in this case, the amount of light emitted from the exit surface 12 is smaller than that in the case where the light control steps 13b, 13b, ... Are formed in the step forming portion 13, and the brightness in the bending portion 14 is reduced. Is likely to decrease.

As described above, in the vehicle lamp 1, the bent portion 14 having the exit surface 12 formed on the light guide body 7 and the optical control steps 13b, 13b, ... Are formed, and the degree of bending is greater than that of the bent portion 14. A small step forming portion 13 is provided, and at least a part of the light controlled by the optical control steps 13b, 13b, ... Is emitted from the exit surface 12 of the bent portion 14.

Therefore, the light controlled by the optical control steps 13b, 13b, ... Formed in the step forming portion 13 having a smaller degree of bending than the bending portion 14 is emitted from the exit surface 12 of the bending portion 14, so that the bending portion It is possible to control the light emitted from the exit surface 12 of the light guide body 14 to suppress the occurrence of uneven brightness in the light guide body 7.

Since the light control steps 13b, 13b, ... Are formed in the step forming portion 13, the light is diffused and the light is emitted from the outer peripheral surface of the step forming portion 13, but the step forming portion 13 Is shielded by the extension 6. Therefore, the light emitted from the step forming portion 13 does not easily affect the light distribution in the vehicle lamp 1, the generation of dazzling light can be prevented, and the appearance can be improved.

Further, a diffusion step is formed as the optical control step 13b.

Therefore, the light incident from the incident surface 13a is diffused by the diffusion step, and the amount of light emitted from the exit surface 12 of the step forming portion 13 increases, so that the brightness of the step forming portion 13 becomes the brightness of the other portion. On the other hand, it is difficult to reduce the brightness, and it is possible to effectively suppress the occurrence of uneven brightness in the light guide body 7.

Further, as a diffusion step, a cylindrical step continuously provided in the circumferential direction of the step forming portion 13 is formed.

Therefore, the light incident from the incident surface 13a is diffused by the cylindrical step, and the amount of light emitted from the exit surface 12 of the step forming portion 13 increases, so that the brightness of the step forming portion 13 becomes the brightness of the other portion. On the other hand, it is difficult to reduce the brightness, and the simple configuration can suppress the occurrence of uneven brightness in the light guide body 7.

A part of the light guided from the step forming portion 13 to the bent portion 14 is further guided toward the extending portion 15, and the light is also emitted from the emitting surface 12 of the extending portion 15.

On the other hand, a part of the light guided to the bent portion 14 is also incident on the plate-shaped portion 10 from the bent portion 14. The light incident on the plate-shaped portion 10 from the bent portion 14 is directed to the first end portion 16 or the second end portion 17, and is emitted from the first end portion 16 and the second end portion 17. At this time, a part of the light is internally reflected at the first end portion 16 and the second end portion 17, but the light reflected internally at the second end portion 17 is a specific region portion 15a of the extending portion 15. It is emitted from the region portion 15a toward the light (see FIG. 6).

The light reflected on the inner surface of the second end portion 17 is emitted from the region portion 15a of the extending portion 15, but since the tip surface of the second end portion 17 is formed as a curved surface 17a, it is a curved surface. The amount of light emitted from 17a is increased (see FIG. 7).

Therefore, the light directed from the bent portion 14 to the second end portion 17 of the plate-shaped portion 10 is easily emitted from the second end portion 17 by the curved surface 17a, and is internally reflected by the second end portion 17. The amount of light is reduced, the light is excessively emitted from the region portion 15a, and the brightness of the region portion 15a is not particularly increased with respect to other portions, so that the occurrence of luminance unevenness in the light guide body 7 is suppressed. Can be done.

The light guide body 7A according to a modified example of the light guide body 7 will be described below (see FIGS. 8 to 12).

The light guide body 7A is formed of a transparent material, and has a light guide portion 20 extending in a direction along the cover 3 and attachment portions 21 and 21 protruding from both ends in the longitudinal direction of the light guide portion 20, respectively. (See FIG. 8).

The light guide body 7A is arranged in the light chamber 5 with the attached portions 21 and 21 attached to a mounting member (not shown) or the lamp housing 2 arranged in the light chamber 5 by screwing or the like.

The light guide portion 20 is formed in a substantially circular shape in a cross-sectional shape orthogonal to the longitudinal direction (see FIG. 9). The light guide portion 20 is formed as a reflecting surface 22 whose surface on the lamp housing 2 side reflects light internally, and reflection steps 22a, 22a, ... Are formed on the reflecting surface 22 at equal intervals in the longitudinal direction. (See FIG. 10). The reflection steps 22a, 22a, ... Have a function of internally reflecting light and guiding it in the longitudinal direction of the light guide unit 20.

The portions between the reflection steps 22a, 22a, ... Of the reflection surface 22 are formed as control surfaces 22b, 22b, ..., Respectively.

The light guide portion 20 is formed as an exit surface 23 on which the surface on the cover 3 side emits light (see FIGS. 9 and 10). However, also on the exit surface 23, depending on the angle of incidence of the light with respect to the exit surface 23, the light is internally reflected by the exit surface 23 and guided in the longitudinal direction of the light guide portion 20.

The control surface 22b of the reflection surface 22 is formed in a state non-parallel to the emission surface 23 and is inclined with respect to the emission surface 23 (see FIG. 10). The dotted line H shown in FIG. 10 is a virtual line parallel to the exit surface 23.

Both end surfaces of the light guide portion 20 in the longitudinal direction are formed as incident surfaces. A light source is arranged at a position facing each incident surface of the light guide unit 20.

As shown in FIG. 8, the light guide portion 20 has a substantially linear extending portion 24, a curved portion 25 that is continuously curved by the extending portion 24, and a linear portion that is continuous by the curved portion 25. It has a first step forming portion 26, a bent portion 27 continuous with the first step forming portion 26, and a linear second step forming portion 28 continuous with the bent portion 27.

The first optical control steps 26a, 26a, ... Are formed at the end of the first step forming portion 26 on the bending portion 27 side (see FIGS. 11 and 12). The first optical control steps 26a, 26a, ... Are formed at positions separated from the reflecting surface 22 in the circumferential direction, for example, 90 ° to 150 °.

The bent portion 27 is formed in a curved shape that is bent in a state of being bent by approximately 90 °. Diffusion steps 27a, 27a, ... Are continuously formed in the circumferential direction on the outer peripheral surface of the bent portion 27. The diffusion steps 27a, 27a, ... Are formed on substantially half of the outer peripheral surface of the bent portion 27 on the cover 3 side. The diffusion steps 27a, 27a, ... Are formed in, for example, a cylindrical step.

The second optical control steps 28a, 28a, ... Are formed at the end of the second step forming portion 28 on the bending portion 27 side. The second optical control steps 28a, 28a, ... Are formed at positions separated from the reflecting surface 22 in the circumferential direction, for example, 90 ° to 150 °.

The first optical control steps 26a, 26a, ... Of the first step forming unit 26 and the second optical control steps 28a, 28a, ... Of the second step forming unit 28 bend the light 27. It has a function of reflecting the inner surface toward the inner peripheral portion 27b of the above.

In the vehicle lamp 1 provided with the light guide 7A, when light is emitted from each light source, the emitted light is incident from each incident surface of the light guide 20.

The light incident from one of the incident surfaces is internally reflected by the reflection steps 22a, 22a, ..., And is guided from the extending portion 24 to the bending portion 27 through the first light control step 26. The light incident and guided from one of the incident surfaces is emitted from the exit surface 23 of the light guide unit 20 at any time during the light guide process.

The light guided by the first light control step 26 and incident on the first light control steps 26a, 26a, ... Is internally reflected and bent in the first light control step 26a, 26a, ... Head toward the inner peripheral portion 27b of the portion 27.

The light guided from the first optical control step 26 toward the bent portion 27 is diffused in the diffusion steps 27a, 27a, ..., And a part of the light is emitted from the exit surface 23 of the bent portion 27.

Further, the light is guided from the bent portion 27 toward the second optical control step 28, and is also emitted from the exit surface 23 of the second optical control step 28.

The light incident from the other incident surface is internally reflected by the reflection steps 22a, 22a, ..., And is guided from the second light control step 28 toward the bent portion 27. Light that is incident and guided from the other incident surface is also emitted from the exit surface 23 of the light guide unit 20 at any time during the light guide process.

The light incident on the second light control steps 28a, 28a, ... Of the second light control step 28 is internally reflected in the second light control step 28a, 28a, ... Head toward the inner peripheral portion 27b.

The light guided from the second optical control step 28 toward the bent portion 27 is diffused in the diffusion steps 27a, 27a, ..., And a part of the light is emitted from the exit surface 23 of the bent portion 27.

Further, the light is guided from the bent portion 27 toward the extending portion 24 through the first optical control step 26, and is also emitted from the exit surface 23 of the first optical control step 26 and the extending portion 24.

Further, in the light guide process, light is incident on the control surfaces 22b, 22b, ... Of the reflection surface 22. Since the control surfaces 22b, 22b, ... Are formed in a state non-parallel to the emission surface 23, the control surface is the emission surface of the light incident on the control surface 22b from the inside of the vehicle and reflected on the inner surface. Compared to the case where it is formed in a state parallel to 23, it becomes easier to go to the outside of the vehicle. That is, as shown in FIG. 10, when the control surface is formed in a state parallel to the exit surface 23, the light A reflected on the inner surface tends to face the exit surface 23 side, but the control surface 22b is the exit surface 23. When the light B is formed in a non-parallel state, the light B reflected on the inner surface has a larger reflection angle on the reflecting surface 22 than the light A, and tends to go to the outside of the vehicle.

As described above, in the light guide body 7A, the control surface 22b is formed in a state non-parallel to the exit surface 23, so that the light can be easily directed to the outside of the vehicle. Therefore, by facilitating the light toward the outside of the vehicle, the viewing angle of the light emitted from the vehicle lamp 1 is increased outside the vehicle, and the safety is improved by improving the visibility of the vehicle lamp 1. be able to.

On the other hand, in order to facilitate the light toward the outside of the vehicle and increase the viewing angle of the light emitted from the vehicle lamp 1, a method of replacing a part of the reflection step 22a with an inclined surface inclined with respect to the exit surface 23. However, in this case, the area of the portion that internally reflects the light toward the exit surface 23 of the reflection step 22a is reduced, the amount of light emitted from the emission surface 23 is reduced, and the emission light rate is lowered. There will be a problem to say.

Therefore, as described above, by forming the portion between the reflection steps 22a, 22a, ... As the control surfaces 22b, 22b, ... Non-parallel to the exit surface 23, the emission light rate can be reduced. It is possible to improve the safety by improving the visibility of the vehicle lamp 1 without coming.

As described above, in the vehicle lamp 1 provided with the light guide body 7A, the bent portion 27 in which the light emitting surface 23 is formed on the light guide body 7A, and the first optical control steps 26a and 26a, ... And the second optical control steps 28a, 28a, ... Are formed respectively, and the first step forming portion 26 and the second step forming portion 28 having a smaller degree of bending than the bending portion 27 are provided, and the second step forming portion 28 is provided. At least a part of the light controlled by the light control steps 26a, 26a, ... Of the first and the second light control steps 28a, 28a, ... Is emitted from the exit surface 23 of the bent portion 27.

Therefore, the first optical control steps 26a, 26a, ..., And the second optical control step formed on the first step forming portion 26 and the second step forming portion 28 having a degree of bending smaller than that of the bending portion 27. Since the light controlled by 28a, 28a, ... Is emitted from the exit surface 23 of the bent portion 27, the light emitted from the exit surface 23 of the bent portion 27 is controlled to cause uneven brightness in the light guide body 7A. Occurrence can be suppressed.

Further, the first step forming portion 26, the second step forming portion 28, and the bending portion 27 are continuously provided in the traveling direction of light, and the first optical control steps 26a, 26a, ..., And the second Light is guided to the inner peripheral portion 27b of the bent portion 27 by the optical control steps 28a, 28a, ....

Therefore, since the amount of light guided to the inner peripheral portion 27b of the bent portion 27 increases, the light emitted from the outer peripheral side and the inner peripheral side of the bent portion 27 is made uniform, and the brightness unevenness in the light guide body 7A is increased. Occurrence can be suppressed.

In addition, although the example of the light guide body 7 in which both ends in the longitudinal direction are shielded by the extension 6 is shown above, for example, in the state where both ends in the longitudinal direction are not shielded by the extension 6 as in the following light guide body 7B. There is also a configuration in which light is emitted from the end portion 30 in the longitudinal direction (see FIG. 13).

In such a light guide body 7B, when the reflection steps 31a, 31a, ... Are formed on the reflection surface 31 separated in the longitudinal direction, the reflection steps 31a, 31a, ... Are totally reflected. The light tends to reach the specific portions 32a, 32a, ... Of the exit surface 32, and the light flux becomes dense and dense in the portions between the portions 32a, 32a, ..., And the brightness unevenness tends to occur.

Therefore, it is desirable that the light guide body 7B is formed with diffusion steps 32b, 32b, ... On the exit surface 32 (see FIG. 14). Examples of the diffusion steps 32b, 32b, ... Are a cylindrical step extending in the longitudinal direction of the light guide body 7B and arranging in the circumferential direction (see FIG. 15), and a cylindrical step extending in the circumferential direction of the light guide body 7B and arranging in the longitudinal direction. (See FIG. 16), it is desirable that a fisheye step (see FIG. 17) formed in a matrix is formed.

By forming the diffusion steps 32b, 32b, ... On the exit surface 32, the light totally reflected in the reflection steps 31a, 31a, ... The light that is diffused and emitted from the exit surface 32 is made uniform, and the occurrence of uneven brightness is suppressed.

The diffusion step (see FIGS. 15 to 17) such as the cylindrical step and the fisheye step has a configuration in which optical control steps 13b, 13b, ... Are formed on the outer peripheral surface of the step forming portion 13 described above (FIG. 3). (See), it may be used as an example of optical control steps 13b, 13b, .... That is, the optical control steps 13b, 13b, ... May be the cylindrical step, the fisheye step, or the like shown in FIGS. 15 to 17.

1 ... Vehicle lighting equipment, 7 ... Light guide body, 8 ... Light guide unit, 10 ... Plate-shaped part, 11 ... Reflective surface, 12 ... Emission surface, 13 ... Step forming part, 13a ... Incident surface, 13b ... Light control step , 14 ... bent part, 14a ... first part, 14b ... second part, 15 ... extending part, 17a ... curved surface, 18 ... light source, 7A ... light guide body, 22 ... reflecting surface, 23 ... exit surface, 26 ... 1st step forming portion, 26a ... 1st optical control step, 27 ... bending portion, 28 ... second step forming portion, 28a ... 2nd optical control step

Claims (3)

A light guide having an incident surface that incidents light emitted from a light source, a reflecting surface that internally reflects light incident from the incident surface, and an emitting surface that emits light internally reflected by the reflecting surface is provided. It ’s a light fixture for vehicles.
The light guide body is provided with a light guide portion having a substantially circular shape or a substantially oval shape in cross section orthogonal to the longitudinal direction.
The light guide portion is provided with a bent portion in which at least a part of the exit surface is formed and bent in a predetermined state, and an optical control step is formed at one end of the light guide portion in the longitudinal direction to form the bent portion. It is provided as a step forming part with a smaller degree of bending than the part.
At least a part of the light controlled by the optical control step is emitted from the exit surface of the bent portion.
A diffusion step is formed as the light control step,
The light incident from the incident surface in the step forming portion is internally reflected by the light control step and diffused while being guided toward the bent portion .
The light guide body is provided with a plate-shaped portion that is continuous with the bent portion and in which light transmitted through the bent portion is incident.
The plate-shaped portion has a curved end face in the traveling direction of the light incident from the bent portion.
A vehicle lamp formed in a substantially flat plate shape in which the plate-shaped portion is projected from the end portion of the bent portion and the extending portion on the bent portion side and is thinner than the light guide portion. The first portion continuous with the step forming portion is formed in a curved shape bent so as to be substantially upwardly convex, and the second portion continuous with the first portion is substantially downward. The vehicle lamp according to claim 1, wherein the lamp is formed in a curved shape that is bent so as to be convex. The step forming portion and the bending portion are continuously provided in the traveling direction of light.
Light is guided to the inner peripheral portion of the bent portion by the optical control step.
The vehicle lamp according to claim 1 or 2.

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