JP5615054B2 - Vehicle lamp - Google Patents

Description

  The present invention relates to a vehicular lamp. More specifically, the present invention relates to a technical field that aims to improve light utilization efficiency and luminance uniformity by making adjacent working surfaces that internally reflect light formed on a plurality of light guides.

  Some vehicle lamps include a plurality of light sources and a light guide that guides light emitted from the plurality of light sources in a predetermined direction inside a lamp outer casing formed by a cover and a lamp housing. (For example, refer to FIG. 5 and FIG. 6 of Patent Document 1).

  In the vehicular lamp described in Patent Document 1, the light guide is formed in an annular shape, and the light emitted from the plurality of light sources is internally reflected to guide the light guide in the extending direction. The light is emitted.

JP 2002-367404 A

  By the way, the direction and the degree to which light is internally reflected depend on the shape of the reflection surface formed as the internal reflection surface, the inclination angle with respect to the light, and the like.

  In the vehicular lamp described in Patent Document 1, a bent portion or a cutout portion is formed in the light guide body, and the shape thereof is partially changed, and the light emitted from the light source and incident on the light guide body is changed. A part of the light leaks in an unintended direction, which may cause a reduction in light utilization efficiency and luminance unevenness.

  In particular, leakage light is likely to occur at a bent portion where the extending direction of the light guide body is greatly changed, and the luminance of the bent portion is lower than that of other portions, and uneven brightness is likely to occur.

  Therefore, an object of the vehicular lamp of the present invention is to improve the utilization efficiency of light and the uniformity of luminance.

  In order to solve the above-described problem, a vehicular lamp has a plurality of light sources and a light emitted from the plurality of light sources extending in a predetermined direction inside a lamp outer casing constituted by a cover and a lamp housing. A plurality of light guides having a light guide part that guides in the direction of the light source, the first light source and the second light source are provided as the light source, and the light emitted from the first light source is incident as the light guide A first light guide having an incident surface and a second light guide having an incident surface on which light emitted from the second light source is incident, and the first light guide has the Forming a first working surface for internally reflecting at least a part of the light incident from the first light source; and at least a part of the light incident from the second light source on the second light guide. A second working surface to be reflected is formed, and the first light guide and the second light guide Is disposed in a state where the first working surface and the second working surface are adjacent to each other, and a part of light emitted from the first light source and reaching the first working surface is the second working surface. Part of the light that has entered the second light guide from the surface, emitted from the second light source, and reached the second working surface is transferred from the first working surface to the first light guide. It is made to enter.

  Therefore, in the vehicular lamp, the light emitted from the first working surface of the first light guide and the second working surface of the second light guide are respectively separated from the second working surface. The light is incident on the second light guide and the first light guide from the first working surface.

In order to solve the above-described problem, another vehicular lamp includes a plurality of light sources and light emitted from the plurality of light sources extending in a predetermined direction inside a lamp outer casing constituted by a cover and a lamp housing. And at least three light guides having a light guide part that guides in the predetermined direction, the first light source and the second light source are provided as the light sources, and the first light guide and the first light guide are provided as the light guides. 2 light guides and a 3rd light guide are provided, and the 1st entrance surface into which the light radiate | emitted from the said 1st light source injects into a said 1st light guide and the 1st light source inject Forming a first working surface that internally reflects at least a part of the emitted light, and a second incident surface on which light emitted from the second light source is incident on the second light guide and the first Forming a second working surface for internally reflecting at least a part of light incident from the two light sources; At least a third working surface and a fourth working surface are formed on the light guide, and the first working surface and the third working surface are arranged adjacent to each other and emitted from the first light source. Part of the light that has reached the first working surface is incident on the third light guide from the third working surface, and the second working surface and the fourth working surface are adjacent to each other. A part of the light emitted from the second light source and reaching the second working surface is incident on the third light guide from the fourth working surface. is there.

  Therefore, in another vehicular lamp, light emitted from each working surface of each light guide is incident on each other light guide from each adjacent working surface.

  The vehicular lamp according to the present invention includes a plurality of light sources and a light guide portion that extends in a predetermined direction and guides light emitted from the plurality of light sources in the predetermined direction, inside a lamp outer casing constituted by a cover and a lamp housing. A vehicle lamp provided with a plurality of light guides having a first light source and a second light source as the light source, and light emitted from the first light source as the light guide is incident A first light guide having an incident surface and a second light guide having an incident surface on which light emitted from the second light source is incident, and the first light guide has the Forming a first working surface for internally reflecting at least a part of the light incident from the first light source; and at least a part of the light incident from the second light source on the second light guide. A reflecting second working surface is formed, and the first light guide and the second light guide are The first working surface and the second working surface are arranged adjacent to each other, and a part of the light emitted from the first light source and reaching the first working surface is the second working surface. Part of the light incident on the second light guide from the first light source and emitted from the second light source and reaching the second working surface enters the first light guide from the first working surface. To be.

  Therefore, leakage light can be reduced and light utilization efficiency can be improved, and luminance unevenness due to partial reduction in luminance due to the occurrence of leakage light is hardly generated, and luminance uniformity can be improved.

  In the invention described in claim 2, the light incident on the part opposite to the side where each of the light sources is located on the light guide part of each of the light guides with the action surface interposed therebetween is provided on the inner surface. A reflecting lens step and an exit surface for emitting the light reflected by the lens step outward are formed.

  Therefore, the light reflection (internal reflection) rate in the light guide is high, and the light can be efficiently guided in the extending direction of the light guide.

Another vehicular lamp according to the present invention includes a plurality of light sources and a light guide that extends in a predetermined direction and guides light emitted from the plurality of light sources in the predetermined direction, inside a lamp outer casing constituted by a cover and a lamp housing. A vehicular lamp including at least three light guides having a light portion, wherein the light source includes a first light source and a second light source, and the light guide includes a first light guide and a first light source. 2 light guides and a 3rd light guide are provided, and the 1st entrance surface into which the light radiate | emitted from the said 1st light source injects into a said 1st light guide and the 1st light source inject Forming a first working surface that internally reflects at least a part of the emitted light, and a second incident surface on which light emitted from the second light source is incident on the second light guide and the first Forming a second working surface for internally reflecting at least a part of the light incident from the two light sources; At least a third working surface and a fourth working surface are formed on the light body, the first working surface and the third working surface are arranged adjacent to each other, emitted from the first light source, and A part of the light reaching the first working surface is incident on the third light guide from the third working surface, and the second working surface and the fourth working surface are adjacent to each other. In addition, a part of the light emitted from the second light source and reaching the second working surface is incident on the third light guide from the fourth working surface.

  Therefore, leakage light can be reduced and light utilization efficiency can be improved, and luminance unevenness due to partial reduction in luminance due to the occurrence of leakage light is hardly generated, and luminance uniformity can be improved.

In the invention described in claim 5, the lens step for internally reflecting the light incident on the light guide portion of the third light guide from the third working surface and / or the fourth working surface. Is forming .

  Therefore, the light reflection (internal reflection) rate in the light guide is high, and the light can be efficiently guided in the extending direction of the light guide.

  The best mode for carrying out the vehicular lamp of the present invention will be described below with reference to the accompanying drawings.

  The vehicular lamp 1 is disposed at both left and right end portions of the front end portion or the rear end portion of the vehicle body. The vehicular lamp 1 is, for example, a so-called clearance lamp that functions as a vehicle width lamp, a so-called daytime running lamp that is lit in a time zone other than nighttime, a so-called tail lamp that functions as a marker lamp for a vehicle behind, or the like. It is used as a lamp having a function.

  As shown in FIGS. 1 and 2, the vehicular lamp 1 includes a lamp housing 2 having a recess opened on one side and a cover 3 that closes the opening surface of the lamp housing 2. A lamp outer casing 4 is configured. The interior of the lamp outer casing 4 is formed as a lamp chamber 5.

  A first light guide 6 and a second light guide 7 are arranged in the lamp chamber 5 in a state substantially along the outer periphery of the cover 3.

  The first light guide 6 has an incident portion 8 extending in the left-right direction and a light guide portion 9 extending in a direction along the outer periphery of the cover 3, and a portion between the incident portion 8 and the light guide portion 9 is at a predetermined angle. (See FIGS. 1 and 2).

  The incident part 8 is formed shorter than the light guide part 9, and the end surface of the incident part 8 opposite to the light guide part 9 is formed as an incident surface 8a.

  The light guide portion 9 has a surface facing the lens 3 formed as an exit surface 9a. In the light guide section 9, on the surface opposite to the exit surface 9a, for example, continuous lens steps 9b, 9b,... Having a triangular or trapezoidal cross section are formed. The lens steps 9b, 9b,... Have a function of internally reflecting incident light.

  The bent portion 10 has, for example, a first working surface 10a bent by 90 ° and inclined by 45 ° with respect to the direction in which the incident portion 8 extends.

  The second light guide 7 has an incident portion 11 extending in the vertical direction and a light guide portion 12 extending in the direction along the outer periphery of the cover 3, and a portion between the incident portion 11 and the light guide portion 12 has a predetermined angle. It is provided as a bent portion 13 that is bent.

  The incident part 11 is formed shorter than the light guide part 12, and the end surface of the incident part 11 opposite to the light guide part 12 is formed as an incident surface 11a.

  The light guide unit 12 has a surface facing the lens 3 formed as an exit surface 12a. The light guide 12 is formed with lens steps 12b, 12b,... Having a continuous cross-sectional shape such as a triangle or trapezoid on the surface opposite to the light exit surface 12a. The lens steps 12b, 12b,... Have a function of internally reflecting incident light.

  The bent portion 13 has, for example, a second action surface 13a bent by 90 ° and inclined by 45 ° with respect to the direction in which the incident portion 11 extends.

  The first working surface 10a of the bent portion 10 in the first light guide 6 and the second working surface 13a of the bent portion 13 in the second light guide 7 are arranged in contact with each other or adjacent to each other. Yes.

  A first light source 14 is disposed at a position near the incident surface 8 a of the first light guide 6, and a second light source 15 is disposed at a position near the incident surface 11 a of the second light guide 7. Has been. For example, light emitting diodes are used as the first light source 14 and the second light source 15.

  In the lamp chamber 5, reflectors 16 and 17 are arranged along the light guide part 9 of the first light guide 6 and the light guide part 12 of the second light guide 7, respectively. The lens steps 9b, 9b,... And the lens steps 12b, 12b,.

  In the vehicular lamp 1 configured as described above, when light is emitted from the first light source 14, the emitted light is emitted from the incident surface 8a of the first light guide 6 as shown in FIG. Incident light passes through the incident portion 8 and reaches the first working surface 10 a of the bent portion 10. The light reaching the first working surface 10a is reflected on the inner surface except for a part thereof, and the light not reflected on the inner surface is incident on the second light guide 7 from the second working surface 13a.

  The light internally reflected by the first working surface 10a is guided in the extending direction of the light guide 9 while repeating total reflection on the inner surface of the light guide 9 of the first light guide 6, or from the exit surface 9a. Emitted. At this time, since the light guide 9 is formed with lens steps 9b, 9b,..., The light reflection (internal reflection) rate is high, and the light is efficiently guided in the extending direction of the light guide 9. .

  Among the light guided through the light guide unit 9, there is also light transmitted through the lens steps 9b, 9b,. The light transmitted through the lens steps 9b, 9b,... Is reflected by the reflecting surface of the reflector 16 and is incident on the light guide unit 9 again and guided in the extending direction of the light guide unit 9, or from the output surface 9a. Emitted.

  The light emitted from the first light source 14 and incident on the second light guide 7 from the second action surface 13a via the first action surface 10a is repeatedly totally reflected on the inner surface of the light guide unit 12. It is guided in the direction in which the light guide unit 12 extends, or is output from the output surface 12a.

  On the other hand, when light is emitted from the second light source 15, the emitted light is incident from the incident surface 11 a of the second light guide 7, passes through the incident portion 11, and the second working surface 13 a of the bent portion 13. To reach. The light reaching the second working surface 13a is reflected on the inner surface except for a part thereof, and the light not reflected on the inner surface is incident on the first light guide 6 from the first working surface 10a.

  The light internally reflected by the second working surface 13a is guided in the extending direction of the light guide 12 while repeating total reflection on the inner surface of the light guide 12 of the second light guide 7, or from the light exit surface 12a. Emitted. At this time, since the lens steps 12b, 12b,... Are formed in the light guide section 12, the light reflection (internal reflection) rate is high, and the light is efficiently guided in the extending direction of the light guide section 12. .

  Among the light guided through the light guide unit 12, there is also light transmitted through the lens steps 12b, 12b,. The light transmitted through the lens steps 12b, 12b,... Is reflected by the reflecting surface of the reflector 17 and is incident on the light guide unit 12 again and guided in the extending direction of the light guide unit 12, or from the output surface 12a. Emitted.

  The light emitted from the second light source 15 and incident on the first light guide 6 from the first action surface 10a via the second action surface 13a is repeatedly totally reflected on the inner surface of the light guide unit 9. The light guide unit 9 is guided in the extending direction or is emitted from the emission surface 9a.

  In the above description, the first light guide 6 and the second light guide 7 having the bent portions 10 and 13 are shown as examples. However, as shown in FIG. 4, one of the light guides is bent. It is also possible to have a configuration that does not have a portion.

  One of the light guides, for example, the first light guide 6A is formed in a straight line, and an end surface opposite to the incident surface 6b in the extending direction is inclined by 45 ° with respect to the extending direction. 10b. Similarly to the first light guide 6, the first light guide 6 </ b> A is also provided with an exit surface 9 a and an exit surface 12 a. The first working surface 10b of the first light guide 6A and the second working surface 13a of the second light guide 7 are arranged in contact with each other or adjacent to each other.

  Similarly to the first light guide 6, for example, a continuous lens step having a triangular or trapezoidal cross section may be formed on the first light guide 6 </ b> A. 4 and the subsequent drawings show a light guide and the like without a lens step.

  The light emitted from the first light source 14 and incident from the incident surface 6b is guided in the direction in which the first light guide 6A extends or is emitted from the emission surface 12a.

  At this time, the light reaching the first working surface 10b is reflected on the inner surface except for a part thereof, and the light not reflected on the inner surface is incident on the second light guide 7 from the second working surface 13a. The light internally reflected by the first working surface 10b is emitted to the outside, and the light incident on the second light guide 7 from the second working surface 13a via the first working surface 10b is guided by the light guide unit. The light is guided in the extending direction of the light guide section 12 while repeating total reflection on the inner surface of the light 12, or is emitted from the light emission surface 12a.

  In the above example, the first working surfaces 10a and 10b and the second working surface 13a are inclined by 45 °. However, the inclination angle between the first working surface and the second working surface is 45 °. It is also possible to make it other than (see FIG. 5).

  The first light guide 6 and the second light guide 7 are inclined at an angle other than 45 ° with respect to the extending direction of the incident portions 8 and 11, respectively, for example, an angle larger than 45 °. 10c and a second working surface 13c. The first working surface 10c of the first light guide 6 and the second working surface 13c of the second light guide 7 are arranged in contact with each other or adjacent to each other.

  The light emitted from the first light guide 6 and reaching the first working surface 10c is reflected on the inner surface except for a part thereof, and the light not reflected on the inner surface is sent from the second working surface 13c to the second light guide. 7 is incident. In addition, light that has been emitted from the second light guide 7 and has reached the second working surface 13c is reflected on the inner surface except for a part thereof, and light that has not been reflected on the inner surface is first guided from the first working surface 10c. Incident on the light body 6.

  Furthermore, although the example which provided the 1st light guide 6 and 6A and the 2nd light guide 7 as a light guide was shown above, the number of light guides is not restricted to two. It is also possible to provide three or more (see FIG. 6).

As the light guide, for example, three of the first light guide 6, the second light guide 7, and the third light guide 18 are provided, and the third light guide 18 is formed in a straight line. The third working surface 18a and the fourth working surface 18b are inclined by 45 ° with respect to the extending direction of both surfaces in the extending direction. The third working surface 18a of the third light guide 18 and the first working surface 10a of the first light guide 6 are arranged in contact with each other or adjacent to each other. The fourth working surface 18b and the second working surface 13a of the second light guide 7 are arranged in contact with each other or adjacent to each other.

  The third light guide 18 is also formed with a continuous lens step having a triangular or trapezoidal cross-sectional shape, for example, similarly to the first light guides 6 and 6A and the second light guide 7. May be.

  When light is emitted from the first light source 14, the emitted light is incident from the incident surface 8a of the first light guide 6 and reaches the first working surface 10a. The light reaching the first working surface 10a is reflected from the inner surface except for a part thereof, and the light not reflected from the inner surface is incident on the third light guide 18 from the third working surface 18a.

  The light internally reflected by the first working surface 10a is guided in the extending direction of the light guide 9 while repeating total reflection on the inner surface of the light guide 9 of the first light guide 6, or from the exit surface 9a. Emitted.

  The light emitted from the first light source 14 and incident on the third light guide 18 from the third action surface 18 a through the first action surface 10 a is totally reflected by the inner surface of the third light guide 18. Is repeated in the direction in which the third light guide 18 extends. The light guided in the extending direction of the third light guide 18 is incident on the second light guide 7 from the second action surface 13a via the fourth action surface 18b, and the light guide unit 12 extends. It guide | induces to a direction or is radiate | emitted from the output surface 12a.

  On the other hand, when light is emitted from the second light source 15, the emitted light is incident from the incident surface 11a of the second light guide 7 and reaches the second working surface 13a. The light reaching the second working surface 13a is reflected on the inner surface except for a part thereof, and the light not reflected on the inner surface is incident on the third light guide 18 from the fourth working surface 18b.

  The light internally reflected by the second working surface 13a is guided in the extending direction of the light guide unit 12 while repeating total reflection on the inner surface of the second light guide 7, or is emitted from the emission surface 12a.

  The light emitted from the second light source 15 and incident on the third light guide 18 from the fourth action surface 18 b via the second action surface 13 a is totally reflected by the inner surface of the third light guide 18. Is repeated in the direction in which the third light guide 18 extends. The light guided in the extending direction of the third light guide 18 is incident on the first light guide 6 from the first action surface 10a via the third action surface 18a, and the light guide unit 9 extends. It guide | induces to a direction or is radiate | emitted from the output surface 9a.

  As described above, in the vehicular lamp 1, the first action surfaces 10a, 10b, and 10c having the function of internally reflecting light are adjacent to the second action surfaces 13a and 13c, or The working surface 10a and the third working surface 18a are adjacent to each other, and the second working surface 13a and the fourth working surface 18b are adjacent to each other.

  Therefore, the light reaching each of the working surfaces 10a, 10b,... Is between the first light guide 6, 6A and the second light guide 7, and between the first light guide 6 and the third light guide. Light is incident between the bodies 18 or between the second light guide body 7 and the third light guide body 18, so that leakage light can be reduced and light utilization efficiency can be improved.

  In addition, since leakage light is reduced, luminance unevenness due to partial reduction in luminance due to the occurrence of leakage light is unlikely to occur, and luminance uniformity can be improved.

  In addition, although the example which provided two or three light guides was shown above, as long as there are two or more light guides, it is arbitrary and it is also possible to provide four or more.

  The shapes and structures of the respective parts shown in the above-described best mode are merely examples of implementations in carrying out the present invention, and the technical scope of the present invention is limitedly interpreted by these. It should not be done.

FIG. 2 to FIG. 6 show the best mode of the vehicular lamp according to the present invention, and this figure is a schematic front view of the vehicular lamp. It is a schematic plan view of the vehicle lamp. It is a schematic diagram which shows the path | route of the light which injected into the light guide in the 1st light guide and the 2nd light guide. It is a schematic diagram which shows the path | route of light when one side is provided with the light guide formed in linear form. It is a schematic diagram which shows the path | route of light in case the inclination-angle of an action surface is other than 45 degrees. It is a schematic diagram which shows the path | route of the light at the time of providing three light guides.

DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp, 2 ... Lamp housing, 3 ... Cover, 6 ... 1st light guide, 7 ... 2nd light guide, 8a ... Incident surface (1st incident surface) , 9 ... Light guide part , 9a ... exit surface, 9b ... lens step, 10a ... first working surface, 11a ... entrance surface (second entrance surface) , 12 ... light guide, 12a ... exit surface, 12b ... lens step, 13a ... first. 2 working surfaces, 14 ... first light source, 15 ... second light source, 6A ... first light guide, 6b ... incident surface, 10b ... first working surface, 10c ... first working surface, 13c ... 2nd action surface, 18 ... 3rd light guide, 18a ... 3rd action surface, 18b ... 4th action surface

Claims (5)

A plurality of light guides each having a plurality of light sources and a light guide part extending in a predetermined direction and guiding light emitted from the plurality of light sources in the predetermined direction inside a lamp outer casing constituted by a cover and a lamp housing. A vehicular lamp equipped with
A first light source and a second light source are provided as the light source,
A first light guide having an incident surface on which light emitted from the first light source is incident as the light guide, and a second surface having an incident surface on which light emitted from the second light source is incident. And a light guide body,
Forming a first working surface for internally reflecting at least a part of the light incident from the first light source on the first light guide;
Forming a second working surface for internally reflecting at least a part of the light incident from the second light source on the second light guide;
Arranging the first light guide and the second light guide in a state where the first working surface and the second working surface are adjacent to each other;
Part of the light emitted from the first light source and reaching the first working surface is incident on the second light guide from the second working surface and emitted from the second light source, and A part of light that has reached the second working surface is incident on the first light guide from the first working surface. The light guide part of each light guide is reflected by the lens step and the lens step for internally reflecting the light incident on the part opposite to the side where each light source is located across the respective working surfaces. The vehicular lamp according to claim 1, wherein an exit surface that emits light outward is formed. At least three light guides having a plurality of light sources and a light guide part extending in a predetermined direction and guiding light emitted from the plurality of light sources in the predetermined direction, respectively, inside a lamp outer casing constituted by a cover and a lamp housing. A vehicle lamp with a body,
A first light source and a second light source are provided as the light source,
A first light guide, a second light guide, and a third light guide are provided as the light guide,
A first incident surface on which the light emitted from the first light source is incident on the first light guide and a first action for internally reflecting at least a part of the light incident from the first light source. Forming a surface,
A second incident surface on which light emitted from the second light source is incident on the second light guide and a second function of internally reflecting at least a part of the light incident from the second light source. Forming a surface,
Forming at least a third working surface and a fourth working surface on the third light guide;
The first working surface and the third working surface are arranged adjacent to each other, and a part of the light emitted from the first light source and reaching the first working surface is the third working surface. Is incident on the third light guide,
The second working surface and the fourth working surface are disposed adjacent to each other, and a part of the light emitted from the second light source and reaching the second working surface is the fourth working surface. The vehicular lamp, wherein the vehicular lamp is made incident on the third light guide. A part of the light incident on the third light guide and reaching the third working surface enters the first light guide from the first working surface,
A part of the light incident on the third light guide and reaching the fourth working surface is made incident on the second light guide from the second working surface. The vehicle lamp according to claim 3. 4. The lens step for internally reflecting the light incident from the third working surface and / or the fourth working surface is formed in the light guide portion of the third light guide. 5. The vehicle lamp as described.

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