JP2019032971A - Vehicle lamp fitting - Google Patents

Abstract

To realize different light emission methods in a vehicle lamp fitting using a transparent material.SOLUTION: A vehicle lamp fitting 10 includes: a transparent material 12 including an incident part 26 in which light enters, a light guide part 34 which guides light from the incident part 26, and multiple steps 36 which are provided on a front surface of the light guide part 34, refract a part of light traveling in the light guide part 34, and emit the light from the front surface; an LED 14 for a stop lamp which is disposed so as to radiate light to the incident part 26; and an LED 20 for a tail lamp which is disposed so as to radiate light to a rear surface of the light guide part 34.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp using a light guide.

  Conventionally, a vehicular lamp that combines an LED and a plate-like light guide that controls light from the LED has been proposed (see, for example, Patent Document 1).

JP 2013-109942 A

  By the way, in a vehicle lamp, there are cases where different lighting methods are required on the same light emitting surface. For example, tail and stop lamps require a tail lamp and a stop lamp on the same light emitting surface.

  This invention is made | formed in view of such a condition, The objective is to provide the technique which can implement | achieve a different lighting method in the vehicle lamp using a light guide.

  In order to solve the above-described problem, a vehicle lamp according to an aspect of the present invention is provided on an incident portion that receives light, a light guide portion that guides light from the incident portion, and a front surface or a rear surface of the light guide portion. A plurality of steps that refract part of the light traveling inside the light guide unit and radiate it from the front surface, a first light source arranged to irradiate light toward the incident unit, and a light guide And a second light source disposed so as to be able to irradiate light toward the rear surface of the light section.

  The plurality of steps may be provided so as to intersect with the traveling direction of the light in the light guide unit.

  The light guide part may be formed in a substantially disc shape with the incident part as a center, and the plurality of steps may be provided in a concentric polygonal shape or a concentric shape on the front surface or the rear surface of the light guide part.

  A plurality of second light sources may be arranged around the first light source.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can implement | achieve a different way of shining can be provided in the vehicle lamp using a light guide.

1 is a schematic front view of a vehicular lamp according to an embodiment of the present invention. It is an AA schematic sectional drawing of the vehicle lamp shown in FIG. It is a figure for demonstrating the mode of light emission of the vehicle lamp at the time of making LED for stop lamps light. It is a figure for demonstrating the mode of light emission of the vehicle lamp at the time of lighting several LED for tail lamps. It is a figure for demonstrating the mode of light emission of the cylindrical light guide at the time of lighting several 1st LED for cylindrical light guides. It is a figure for demonstrating the mode of light emission of the cylindrical light guide at the time of lighting several 2nd LED for cylindrical light guides. It is a figure which shows the modification of a cylindrical light guide.

  Hereinafter, a vehicular lamp according to an embodiment of the present invention will be described in detail with reference to the drawings. In the present specification, when terms indicating directions such as “up”, “down”, “front”, “back”, “left”, “right”, “inside”, “outside”, etc. are used, It means the direction in the posture when the vehicular lamp is mounted on the vehicle.

  FIG. 1 is a schematic front view of a vehicular lamp 10 according to an embodiment of the present invention. FIG. 2 is a schematic AA sectional view of the vehicular lamp 10 shown in FIG. The vehicular lamp 10 is used as a tail and stop lamp mounted on the rear of the vehicle. The vehicular lamp 10 according to the present embodiment emits light as a tail lamp and light as a stop lamp on the same light emitting surface.

  The vehicular lamp 10 includes a bowl-shaped light guide 12, a stop lamp LED 14, a stop lamp substrate 16 on which the stop lamp LED 14 is mounted, a stop lamp support member 18 that supports the stop lamp substrate 16, A tail lamp LED 20, a tail lamp substrate 22 on which the tail lamp LED 20 is mounted, and a tail lamp support member 24 that supports the tail lamp substrate 22.

  The bowl-shaped light guide 12 controls light from the stop lamp LED 14 and the tail lamp LED 20. The bowl-shaped light guide 12 is a rotating body with Ax as an axis, and is generally formed in a bowl shape. The bowl-shaped light guide 12 may be formed, for example, by injection molding a transparent resin such as acrylic.

  As shown in FIG. 2, the bowl-shaped light guide 12 allows light from the stop lamp LED 14 and the tail lamp LED 20 to enter from the rear surface and to exit from the front surface. Therefore, the front surface of the bowl-shaped light guide 12 is the light emitting surface of the vehicular lamp 10.

  The bowl-shaped light guide 12 includes an incident portion 26 that makes light from the stop lamp LED 14 incident on the central portion of the rear surface. The incident part 26 includes a first incident surface 28 and a second incident surface 30.

  The first incident surface 28 is located on the axis Ax. Of the light emitted from the stop lamp LED 14, light having a relatively small emission angle is incident on the first incident surface 28. The first incident surface 28 has a cross-sectional shape that is convex. The light that has entered the bowl-shaped light guide 12 from the first incident surface 28 is emitted forward from the first light-emitting face 32 having a convex curve formed at the center of the front surface of the bowl-shaped light guide 12. The

  The second incident surface 30 is formed so as to surround the first incident surface 28. Of the light emitted from the stop lamp LED 14, light having a relatively large emission angle is incident on the second incident surface 30. The light that has entered the bowl-shaped light guide 12 from the second incident surface 30 proceeds to the light guide 34 of the bowl-shaped light guide 12.

  In the present embodiment, the light guide part 34 is formed in a substantially disk shape with the incident part 26 as the center. The light guide 34 guides light that has entered the bowl-shaped light guide 12 from the second incident surface 30.

  The front surface of the light guide 34 is a second light emitting surface 33 that emits light traveling in the light guide 34 to the front of the lamp. A plurality of steps 36 are formed on the front surface (second light emitting surface 33) of the light guide 34 to refract and emit part of the light traveling in the light guide 34. The plurality of steps 36 are formed so as to intersect the light traveling direction in the light guide 34.

  In the present embodiment, as shown in FIG. 1, the front surface of the light guide 34 is divided into 12 fan-shaped regions, and in each region, a plurality of linear steps 36 have a diameter of the light guide 34. Arranged in the direction. Since light is guided in the radial direction of the light guide 34 in each region, each step 36 intersects the light traveling direction in the light guide 34. When step 36 of each region is connected, it can be seen that step 36 is formed in a concentric polygonal shape with the axis Ax as the center as a whole of the bowl-shaped light guide 12.

  The stop lamp LED 14 is disposed so as to be able to irradiate light toward the central incident portion 26 of the bowl-shaped light guide 12. On the other hand, the tail lamp LED 20 is arranged to be able to irradiate light toward the rear surface of the light guide portion 34 of the bowl-shaped light guide 12. In the present embodiment, a plurality of tail lamp LEDs 20 are arranged around the stop lamp LEDs 14. Specifically, as shown in FIG. 1, a tail lamp LED 20 is arranged for each fan-shaped region.

  The way of lighting the vehicular lamp 10 configured as described above will be described.

  FIG. 3 is a view for explaining the state of light emission of the vehicular lamp 10 when the stop lamp LED 14 is turned on. In FIG. 3, the light emitting region is schematically shown by hatching. Moreover, in FIG. 2, the light ray radiate | emitted from LED14 for stop lamps is shown as a continuous line. As described above, light having a relatively small emission angle out of the light emitted from the stop lamp LED 14 enters the bowl-shaped light guide 12 from the first incident surface 28, and the lamp from the first light emitting surface 32. Emitted forward. Thereby, substantially the entire area of the first light emitting surface 32 emits light.

  In addition, light having a relatively large emission angle out of the light emitted from the stop lamp LED 14 enters the bowl-shaped light guide 12 from the second incident surface 30 and enters the light guide 34. The light that has entered the light guide 34 travels through the light guide 34 while repeating total reflection on the front and rear surfaces of the light guide 34. Part of the light incident on step 36 formed on the front surface of the light guide 34 is refracted in step 36 and emitted from the front surface of the light guide 34 to the front of the lamp. Light is refracted and emitted in each of the plurality of steps 36, so that substantially the entire area of the second light emitting surface 33 emits light.

  As described above, when the stop lamp LED 14 is turned on, substantially the entire area of the first light emitting surface 32 and the second light emitting surface 33 emits light.

  FIG. 4 is a view for explaining a state of light emission of the vehicular lamp 10 when a plurality of tail lamp LEDs 20 are turned on. Also in FIG. 4, the light emitting region is schematically shown by hatching. Moreover, in FIG. 2, the light ray radiate | emitted from LED20 for tail lamps is shown with a broken line. The light emitted from the tail lamp LED 20 enters the light guide 34 from the rear surface of the light guide 34, and is emitted forward from the second light emitting surface 33 on the front surface of the light guide 34. When the light is emitted from the second light emitting surface 33, the light is refracted by the step 36, so that each fan-shaped region on the second light emitting surface 33 emits light in a line extending in a direction perpendicular to the linear step 36. To do. Therefore, as shown in FIG. 4, the second light emitting surface 33 as a whole can emit a plurality of lines of light that extend radially.

  Thus, according to the vehicular lamp 10 according to the present embodiment, different lighting methods can be realized on the same light emitting surface when the stop lamp LED 14 is turned on and when the tail lamp LED 20 is turned on. . In particular, when the tail lamp LED 20 is turned on, it is possible to obtain a novel way of illuminating a plurality of line-like light emission extending radially.

  Returning to FIG. 1 and FIG. 2, the vehicular lamp 10 according to this embodiment further includes a cylindrical light guide 40, a first LED 41 for a cylindrical light guide for emitting light from the cylindrical light guide 40, and a cylindrical shape. Second LED for light guide 42, cylindrical light guide substrate 43 on which first LED 41 for cylindrical light guide and second LED for cylindrical light guide 42 are mounted, and a cylinder that supports cylindrical light guide substrate 43 And a light guide support member 44. The cylindrical light guide 40 and the like constitute a lamp unit for improving the design of the vehicular lamp 10.

  The cylindrical light guide 40 controls light from the first LED 41 for the cylindrical light guide and the second LED 42 for the cylindrical light guide. The cylindrical light guide 40 is formed in a cylindrical shape with the axis Ax as the central axis. The cylindrical light guide 40 may be formed, for example, by injection molding a transparent resin such as acrylic. The cylindrical light guide 40 is disposed so as to accommodate the above-described bowl-shaped light guide 12 and the like inside.

  A plurality of steps 45 are arranged on the outer surface of the cylindrical light guide 40 in the height direction of the second LED 42 for the cylindrical light guide. Each step 45 is formed along the outer periphery of the cylindrical light guide 40.

  The first LED 41 for the cylindrical light guide is disposed so as to be able to irradiate light toward the rear end face 46 of the cylindrical light guide 40. A plurality of diffusion steps 48 are formed on the rear end surface 46 of the cylindrical light guide 40 in order to diffuse the incident light from the first LED 41 for the cylindrical light guide over the entire circumference of the cylindrical light guide 40. . On the other hand, the second LED 42 for the cylindrical light guide is disposed so as to be able to irradiate light toward the inner surface 47 of the cylindrical light guide 40. In the vehicular lamp 10 according to the present embodiment, a set of a plurality of first light guides 41 for a cylindrical light guide and a second LED 42 for a cylindrical light guide are arranged along the circumferential direction of the cylindrical light guide 40. . Specifically, as shown in FIG. 1, a set of the first LED 41 for the cylindrical light guide and the second LED 42 for the cylindrical light guide is arranged for each fan-shaped region.

  Next, how the cylindrical light guide 40 is illuminated will be described.

  FIG. 5 is a diagram for explaining a state of light emission of the cylindrical light guide 40 when the plurality of first LEDs 41 for the cylindrical light guide are turned on. FIG. 5 is a schematic side view of the cylindrical light guide 40, and the light emitting area is schematically shown by hatching. Moreover, in FIG. 2, the light ray radiate | emitted from 1st LED41 for cylindrical light guides is shown with a dashed-two dotted line. The light emitted from the first LED 41 for the cylindrical light guide enters the cylindrical light guide 40 from the rear end face 46 of the cylindrical light guide 40. After the incident light is diffused in the diffusion step 48, it proceeds through the cylindrical light guide 40 while repeating total reflection on the inner and outer surfaces of the cylindrical light guide 40. Part of the light incident on the step 45 formed on the outer surface of the cylindrical light guide 40 is refracted in step 45 and emitted from the outer surface of the cylindrical light guide 40. As light is refracted and emitted in each of the plurality of steps 45, substantially the entire outer surface of the cylindrical light guide 40 emits light.

  Instead of the plurality of first LEDs 41 for the cylindrical light guide, a rod-shaped light guide may be disposed along the entire circumference of the rear end face 46 of the cylindrical light guide 40. In this case, since light enters the entire circumference of the cylindrical light guide 40, it is not necessary to form the diffusion step 48 on the rear end face 46.

  FIG. 6 is a view for explaining a state of light emission of the cylindrical light guide 40 when the plurality of second LEDs 42 for the cylindrical light guide are turned on. FIG. 6 is a schematic side view of the cylindrical light guide 40, and the light emitting region is schematically shown by hatching. Moreover, in FIG. 2, the light ray radiate | emitted from 2nd LED42 for cylindrical light guides is shown with a dashed-dotted line. The light emitted from the second LED 42 for the cylindrical light guide enters the cylindrical light guide 40 from the inner surface of the cylindrical light guide 40 and is emitted from the outer surface of the cylindrical light guide 40. When the light is emitted from the outer surface of the cylindrical light guide 40, the light is refracted by the step 45, so that a plurality of line-like light emission extending in the direction orthogonal to the step 45 (that is, the arrangement direction of the step 45) is obtained. It is done. The line-like light emission is gradation light emission in which the luminance is highest at the portion close to the cylindrical light guide second LED 42 and becomes lower as the distance from the cylindrical light guide second LED 42 is increased.

  Thus, also in the cylindrical light guide 40, when the first LED 41 for the cylindrical light guide is turned on and when the second LED 42 for the cylindrical light guide is turned on, the same light emitting surface is different. You can realize how to shine. In particular, when the second LED 42 for the cylindrical light guide is turned on, it is possible to obtain a novel way of light emission such as gradational line emission.

  FIG. 7 is a diagram illustrating a modification of the cylindrical light guide. In the above-described embodiment, the step 45 is formed directly on the outer surface of the cylindrical light guide 40 made of transparent resin. However, in the cylindrical light guide 60 shown in FIG. 7, the resin is formed on the outer surface of the cylindrical light guide. A wire 62 made of wire is wound. Even when the cylindrical light guide 60 is configured as described above, gradation light emission can be obtained by making the light from the second LED 42 for the cylindrical light guide incident on the inner surface of the cylindrical light guide 60. Can do. Further, by guiding the light using the wire 62 as an optical fiber, it is possible to combine the light emission of the wire 62 and the light emission of the line shape to obtain a more innovative way of shining.

  The present invention has been described above based on the embodiment. It should be understood by those skilled in the art that these embodiments are exemplifications, and that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention.

  For example, in the above-described embodiment, the plurality of steps 36 are formed on the front surface of the light guide 34 of the bowl-shaped light guide 12, but the plurality of steps 36 may be formed on the rear surface of the light guide 34.

  Moreover, in the above-mentioned embodiment, although the some step 36 was formed in the concentric polygonal shape in the front surface of the light guide part 34 of the bowl-shaped light guide 12, the some step 36 may be formed concentrically. Also in this case, a plurality of line-like light emission extending radially can be obtained.

  DESCRIPTION OF SYMBOLS 10 Vehicle lamp, 11 Tail & stop lamp, 12 Hook-shaped light guide, 14 Stop lamp LED, 20 Tail lamp LED, 22 Tail lamp substrate, 26 Incident part, 28 First incident surface, 30 Second incident surface, 32 1st light emitting surface, 33 2nd light emitting surface, 34 light guide part, 36, 45 step, 40 cylindrical light guide, 41 1st LED for cylindrical light guide, 42 2nd LED for cylindrical light guide, 43 Cylindrical light guide substrate, 46 rear end face, 60 cylindrical light guide, 62 wires.

Claims (4)

Refracting a part of the light that travels in the light guide provided on the front or rear surface of the light guide, and a light guide that guides the light from the light incident part. A plurality of steps for emitting from the front surface, and a light guide comprising:
A first light source arranged to irradiate light toward the incident portion;
A second light source arranged to irradiate light toward the rear surface of the light guide unit;
A vehicular lamp characterized by comprising:   The vehicular lamp according to claim 1, wherein the plurality of steps are provided so as to intersect a traveling direction of light in the light guide unit. The light guide part is formed in a substantially disc shape centered on the incident part,
The vehicular lamp according to claim 1, wherein the plurality of steps are provided in a concentric polygonal shape or a concentric circle shape on a front surface or a rear surface of the light guide unit.   The vehicular lamp according to claim 3, wherein a plurality of the second light sources are disposed around the first light source.

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