JP2016004667A - Vehicle lighting - Google Patents

Abstract

A vehicular lamp capable of improving the appearance of an exit surface of a light guide is provided. A light guide 22 having a plurality of light guide unit portions 70 provided adjacent to each other and a semiconductor light emitting element 21 that emits light to incident surfaces 71 and 72 of each light guide unit portion 70 are provided. The light body 22 is formed in a plate shape extending along an adjacent direction in which the light guide unit portions 70 are adjacent to each other, and the emission surface 74 of each light guide unit portion 70 is connected in the adjacent direction so as to extend in the adjacent direction. It has a surface 77, a part of the continuous emission surface 77 is curved backward toward the lamp side, and has a diffusion surface 31 a that diffuses and reflects light behind the reflection surface 75. [Selection] Figure 3

Description

  The present invention relates to a vehicular lamp.

In recent years, in order to develop a lamp with a new design, development of a vehicular lamp using a semiconductor light emitting element such as an LED (Light Emitting Diode) has been promoted.
For example, a vehicular lamp is known that includes a light emitting diode group in which a plurality of light emitting diodes are arranged in a row, and a light guide plate made of a transparent plate arranged on the front side of the light emitting diode group (Patent Document 1). reference).

JP 2014-38733 A

A vehicular lamp having a light emitting diode group as in Patent Document 1 may appear to have a dark portion on a part of the exit surface of the light guide, which may reduce the appearance of the exit surface.
In addition, in order to enhance the design, when a part of the exit surface is curved backward toward the lamp side to make the exit surface into a three-dimensional shape, the curved part is directed in the exit axis direction of the lamp. On the other hand, when viewed from the crossing direction, the dark part was easily recognized.

  The objective of this invention is providing the vehicle lamp which can improve the appearance of a light guide.

The vehicular lamp according to the present invention is:
An incident surface on which light is incident, a light guide unit that guides light incident on the incident surface, an exit surface that emits light guided by the light guide unit, and an incident surface that is incident from the incident surface A light guide that is provided with a plurality of light guide unit portions adjacent to each other, and a reflective surface that reflects part of the light guided through the light guide portion toward the front of the lamp;
A semiconductor light emitting element that is provided at a position facing the incident surface of each light guide unit and emits light to the incident surface;
With
The light guide is
The light guide unit is formed in a plate shape extending along the adjacent direction,
The emission surface of each light guide unit portion is connected in the adjacent direction, and has a strip-like continuous emission surface extending in the adjacent direction,
A part of the continuous emission surface is curved backward toward the lamp side,
A diffusion surface that diffuses and reflects light is provided on at least a part of the reflection surface or on the rear side of the reflection surface.

  Conventionally, when a part of the continuous emission surface of the light guide has a three-dimensional shape that curves backward toward the side of the lamp, a part of the continuous emission surface intersects the emission axis direction of the lamp. When viewed from an obliquely forward direction close to the direction, particularly the side, a part of the reflection surface of the light guide may be recognized as a dark part. However, according to the vehicular lamp having the above-described configuration, the diffusion surface is provided on at least a part of the reflecting surface or on the rear side of the reflecting surface, so that at least when the lamp is not lit, one of the light incident on the inside from the outside of the lamp is used. The part is diffused by the diffusion surface, and a part of the diffused light is emitted toward the outside of the lamp through the reflection surface. For this reason, when viewed from the outside of the lamp, the reflection surface appears as bright as the surroundings, and is difficult to be recognized as a dark part. Therefore, it is possible to improve the appearance of the light guide when not lit, and to improve the appearance of the lamp.

In the vehicular lamp of the present invention, the plurality of semiconductor light emitting elements are provided on a flexible printed board whose surface is painted white,
The surface of the flexible printed board is preferably the diffusion surface.

  According to the vehicular lamp having the above-described configuration, the diffusion surface can be configured by using the flexible printed circuit board that is a member on which the semiconductor light emitting element is installed, and the limited design space can be effectively used.

In the vehicle lamp of the present invention, the light guide has a connection surface that connects the reflection surfaces of the light guide unit portions adjacent to each other along the adjacent direction,
It is preferable that the diffusion surface extends to at least a part of the connection surface or the rear side of the connection surface.

  According to the vehicular lamp configured as described above, when the lamp has a connection surface that connects each reflection surface of each light guide unit portion, when the lamp is viewed from a direction that intersects the emission axis direction of the lamp, the connection surface is a dark portion. It may be recognized. By providing the diffusion surface to at least a part of the connection surface or the rear side of the connection surface, the connection surface is not easily recognized as a dark part even when the lamp is viewed from the direction intersecting the emission axis direction.

  In the vehicular lamp of the present invention, the light guide has a portion extending upward or downward of the lamp toward the lamp side, and diffuses light to the side opposite to the lamp side with respect to the portion. It is preferable that a diffusing member to be reflected is provided.

  According to the vehicular lamp configured as described above, the dark portion can be made inconspicuous even in the portion of the light guide that extends above or below the lamp, and the appearance can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp which can improve the appearance of a light guide can be provided.

1 is a longitudinal sectional view of a vehicular lamp according to an embodiment of the present invention. It is a figure explaining the shape of a light guide, Comprising: (a) is a top view from the lamp upper part, (b) is the front view seen from the lamp front, (c) is a perspective view. It is a top view of a part of lamp unit of the vehicular lamp at the time of lighting. It is a horizontal sectional view of the rising part of the lamp unit of the vehicular lamp, (a) is a diagram showing the optical path when not lit, (b) is a diagram showing the optical path when lit. It is a top view of a part of lamp unit of the vehicular lamp at the time of non-lighting. FIG. 9 is a plan view of a part of a lamp unit of a vehicle lamp according to Modification 1. FIG. 10 is a plan view of a part of a lamp unit of a vehicle lamp according to a second modification.

Hereinafter, an example of an embodiment of a vehicular lamp according to the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a vehicular lamp 10 according to an embodiment of the present invention.

  As shown in FIG. 1, a vehicular lamp 10 according to this embodiment includes a resin lamp body 11 that is fixed to a vehicle body in a shape in which the front side of the lamp (left side in FIG. 1) is opened, and the lamp body 11. And a transparent resin outer cover 12 attached to the opening. The outer cover 12 is disposed so as to close the opening of the lamp body 11 from the front, and forms a lamp chamber S between the outer cover 12 and the lamp body 11. The vehicle lamp 10 is used, for example, as a daytime running lamp (DRL) or a clearance lamp of a vehicle. This vehicular lamp 10 is mounted on each of the left and right sides of the front portion of the vehicle.

  The vehicular lamp 10 includes a lamp unit 20 in the lamp chamber S. The lamp unit 20 is supported by a resin frame 33 fixed to the lamp body 11. The lamp unit 20 includes a semiconductor light emitting element 21 as a light source and a light guide 22.

  The semiconductor light emitting element 21 is, for example, a white light emitting diode (LED) having a light emitting unit with a size of about 1 mm square. The semiconductor light emitting element 21 emits light substantially uniformly in the vertical and horizontal directions from the light emitting surface 21a toward the front of the lamp. The semiconductor light emitting element 21 is mounted on the FPC 31 so that a mounting surface 21b opposite to the light emitting surface 21a faces a flexible printed circuit board (hereinafter referred to as FPC) 31. On the back side of the FPC 31, an aluminum heat dissipation plate 32 for diffusing heat generated from each semiconductor light emitting element 21 and the FPC 31 is disposed. The heat sink 32 is fixed to the frame 33, whereby the FPC 31 on which the semiconductor light emitting element 21 is mounted is supported on the frame 33 via the heat sink 32.

  The frame 33 includes a support plate portion 34 and a fixed plate portion 35 that are arranged vertically, and a flat plate portion 36 that is arranged horizontally. The support plate portion 34 extends upward from the rear end of the flat plate portion 36, and the fixed plate portion 35 extends downward from the front end of the flat plate portion 36.

  The light guide 22 is formed by injection molding a resin having translucency. The light guide 22 is formed with a plate-like extension 41 extending downward from the lower end on the front side of the lamp. The extending portion 41 is formed with a positioning and fixing portion 42 that is bent rearward from its lower end and further extends downward. The positioning and fixing portion 42 is fixed with screws or the like while being positioned with respect to the fixing plate portion 35 of the frame 33. The light guide 22 is supported at a predetermined position of the frame 33 by fixing the positioning fixing portion 42 to the fixing plate portion 35 of the frame 33.

  An extension 45 is provided in the lamp chamber S. The extension 45 is disposed below the front side of the lamp unit 20, and the extension 45 covers the lower side of the front side of the lamp unit 20. Thereby, the extension 45 suppresses the generation of scattered light due to the irregular reflection of light below the lamp chamber S.

FIG. 2 is a diagram schematically illustrating the shape of the light guide 22 of the lamp provided in the right part of the vehicle, in which (a) is a plan view from above the lamp and (b) is a front view from the front of the lamp. FIG. 2C is a perspective view.
As shown in FIG. 2A, the light guide 22 is formed so as to curve backward from the center side of the vehicle toward the side of the vehicle while being mounted on the vehicle. In addition, as shown in FIG. 2B, the light guide 22 is formed so as to bend upward from the center of the vehicle toward the side of the vehicle when mounted on the vehicle. And a rising portion extending upward on the side of the vehicle. The rising portion may be a portion extending downward on the side of the vehicle. In the description of this example, the side of the vehicle and the side of the lamp indicate the same direction.

FIG. 3 is a plan view of a part of the lamp unit 20 of the vehicular lamp 10.
As shown in FIG. 3, the light guide 22 has a plurality of light guide unit portions 70. The light guide unit portions 70 are adjacent to each other. Each light guide unit section 70 has incident surfaces 71 and 72, a light guide section 73, an exit surface 74, and a reflection surface 75. The incident surface 71 is formed in a portion of the light guide unit 70 that faces the semiconductor light emitting element 21. In addition, the light guide unit 70 has light guide protrusions 76 on both sides of the incident surface 71. The light guide protrusion 76 has a surface on the semiconductor light emitting element 21 side as an incident surface 72 and a surface opposite to the semiconductor light emitting element 21 as a reflecting surface 75. Light from the semiconductor light emitting element 21 is incident on the incident surfaces 71 and 72. The light guide unit 73 guides light incident on the incident surfaces 71 and 72, and the emission surface 74 emits light guided by the light guide unit 73. The reflection surface 75 reflects at least a part of the light incident from the incident surface 72 and guided through the light guide unit 73 toward the front of the lamp.

  The light guide 22 is formed in a plate shape extending along the adjacent direction in which the light guide unit 70 is adjacent. The light exit surface 74 of each light guide unit unit 70 is connected in the adjacent direction of the light guide unit unit 70. Thereby, the light guide 22 has a strip-shaped continuous emission surface 77 extending in the adjacent direction. The continuous light exit surface 77 is formed so that the light guide 22 is bent from the center side of the vehicle toward the side of the vehicle toward the rear side of the lamp while being mounted on the vehicle. It is curved toward the rear of the lamp.

  A plurality of minute pedestals 79 and minute curved convex steps 78 are formed on the continuous emission surface 77. Each step 78 is provided on a vertical surface portion 79 a orthogonal to the emission axis direction of the lamp formed on each pedestal portion 79. As a result, in each step 78, the central axis of the curved convex portion is directed in the direction of the emission axis of the lamp and is made parallel to each other.

  A plurality of semiconductor light emitting elements 21 are mounted on the FPC 31. These semiconductor light emitting elements 21 are respectively provided at positions facing the incident surfaces 71 of the respective light guide unit portions 70 of the light guide 22, and emit light to the incident surfaces 71 of the respective light guide unit portions 70. The semiconductor light emitting element 21 also emits light to the incident surface 72 of the light guide protrusion 76 of the light guide unit 70.

  The FPC 31 on which the semiconductor light emitting element 21 is mounted is disposed on the rear side of the lamp in the light guide 22. In the FPC 31, the surface on the light guide 22 side is painted white by, for example, screen printing, and the surface on the light guide 22 side that is white is a diffusion surface 31a that diffuses and reflects light. Yes. Thereby, each light guide unit part 70 of the light guide 22 has a diffusion surface 31 a that diffuses and reflects light on the rear side of the reflection surface 75.

FIG. 4 is a horizontal cross-sectional view of the rising portion of the lamp unit 20 of the vehicular lamp 10, where (a) shows an optical path when not lit and (b) shows an optical path when lit.
. As shown in FIGS. 4 (a) and 4 (b), the light guide 22 is curved upward and raised upward, and the diffusion plate 81 ( An example of a diffusing member is provided. The diffusion plate 81 has a light diffusion surface 81a whose surface on the light guide 22 side is painted white by, for example, screen printing. The diffusion plate 81 is supported by a support plate 82 fixed to the frame 33.

FIG. 5 is a plan view of a part of the lamp unit 20 of the vehicular lamp 10 when not lit.
As shown in FIG. 5, when the lamp is not lit, light from the outside of the lamp (hereinafter referred to as external light L) is incident on the inside of the light guide portion 73 from a part of the continuous emission surface 77 and reflected. The light is emitted from 75 toward the FPC 31. Thereafter, a part La of the light diffused by the diffusing surface 31 a of the FPC 31 enters the light guide 73 again from the part 75 a of the reflecting surface 75 and is emitted from a part of the continuous emitting surface 77.

  By the way, this vehicular lamp 10 is improved in design by using the light guide 22 having a three-dimensional shape in which a part of the continuous emission surface 77 is curved backward toward the side. . In the light guide 22 in which a part of the continuous emission surface 77 is curved backward toward the lamp side, in the light guide unit 70 adjacent to each other, the respective continuous reflection surfaces 75 are arranged on the lamp rear side. The reflecting surface 75 of the light guide unit 70 to be used is larger. However, even if it is the reflective surface 75 arrange | positioned at the lamp rear side, the edge part 75a becomes narrow width dimension W1 when it sees from the output-axis Ax direction of the lamp | ramp which is the front of a vehicle. For this reason, the portion of the end portion 75a is not easily recognized as the dark portion D.

  However, when viewed from the direction (diagonal front, etc.) intersecting the exit axis Ax direction of the lamp on the side, the end portion 75a of the reflecting surface 75 is wider than the width dimension W1 when viewed from the front. The dimension becomes W2, and the inside of the lamp (the back of the light guide) can be seen through. In addition, in the light guide 22 in which a part of the continuous emission surface 77 is curved backward toward the side, the side surface 79b of the pedestal 79 provided to direct the step 78 to the front and the end of the reflection surface 75 are provided. Since the inside of the lamp can be seen through the portion 75a, the inside of the lamp can be easily recognized as the dark portion D. Thus, in the light guide 22 in which a part of the continuous emission surface 77 is curved backward toward the side, the region inside the lamp that can be seen from the end portion 75a of the reflection surface 75 that is not conspicuous in the front view, When viewed obliquely from the front, the dark portion D is noticeable, which may affect the appearance of the lamp when it is not lit.

  Therefore, in the vehicular lamp 10 according to the present embodiment, the diffusion surface on the rear side of the reflecting surface 75 including the end portion 75a that may be recognized as the dark portion D when viewed from the diagonally forward direction of the lamp in the plate-like light guide 22. 31a is provided. Thereby, part La of the external light L is diffused by the diffusing surface 31a, so that the diffusing surface 31a appears bright through the end portion 75a of the reflecting surface 75 when viewed obliquely from the front, and the end portion 75a of the reflecting surface 75 is surrounded by the periphery 75a. Appears to be as bright as. In this way, the vicinity of the end portion 75 of the reflecting surface 75 is difficult to be recognized as the dark portion D when viewed from the outside of the lamp. Therefore, the appearance of the exit surface 74 of the light guide 22 when not lit can be improved, and the appearance of the lamp can be improved.

Next, the optical path when the vehicular lamp 10 according to this embodiment is turned on will be described with reference to FIG.
When power is supplied to each semiconductor light emitting element 21, these semiconductor light emitting elements 21 are turned on. Then, the light of the semiconductor light emitting element 21 enters the incident surfaces 71 and 72 of the corresponding light guide unit portions 70.

  A part of the light L1 from the semiconductor light emitting element 21 that has entered the incident surface 71 is refracted by the incident surface 71 in a direction parallel to the emission axis Ax of the semiconductor light emitting element 21. The light L1 refracted in this way is guided through the inside of the light guide 73, and then diffused and emitted at step 78 on the exit surface 74.

  Further, a part of the light L2 from the semiconductor light emitting element 21 that has entered the incident surface 72 of the light guide protrusion 76 is internally reflected by the reflecting surface 75 so as to be parallel to the emission axis Ax. The light L <b> 2 reflected in this way is guided through the inside of the light guide unit 73, and then diffused and emitted at step 78 on the emission surface 74.

  Further, a part of the light L3 emitted from the semiconductor light emitting element 21 is not incident on the incident surfaces 71 and 72 but is reflected on the surface of the light guide protrusion 76 and diffused by the diffusion surface 31a of the FPC 31. . A part L3a of the light diffused by the diffusing surface 31a enters the light guide 73 from the end 75a of the reflecting surface 75 and is emitted from a part of the continuous emitting surface 77.

  Thereby, in the vehicular lamp 10, light is emitted substantially uniformly from the entire belt-like continuous emission surface 77 of the light guide 22. As a result, when viewed from the front of the lamp, the continuous light exit surface 77 of the light guide 30 shines evenly without any part being lit, and a good appearance is obtained.

  By the way, as described above, the vehicular lamp 10 is designed by using the light guide body 22 having a three-dimensional shape in which a part of the continuous emission surface 77 curves backward toward the lamp side. Sexuality is enhanced. In such a light guide 22, in each light guide unit 70 adjacent to each other, each continuous reflective surface 75 is larger than the reflective surface 75 of the light guide unit 70 disposed on the rear side of the lamp. As a result, light may not sufficiently reach the end 75a of the reflecting surface 75 far from the semiconductor light emitting element 21.

  Even when the light does not sufficiently reach the end 75a of the reflecting surface 75, the end 75a of the reflecting surface 75 has a narrow width dimension W1 when viewed from the exit axis Ax direction of the lamp that is the front of the vehicle. For this reason, the portion of the end portion 75a is not easily recognized as the dark portion D. Even if the light does not reach the end 75a of the reflecting surface 75 sufficiently, the light slightly diffused in the left-right direction from the other part of the reflecting surface 75 with respect to the emission axis Ax or each step 78. Due to the diffused light, the end portion 75a is not easily recognized as the dark portion D in front view.

  However, when viewed from a direction intersecting the exit axis Ax direction of the lamp on the side of the vehicle (such as obliquely forward), the end portion 75a of the reflecting surface 75 is larger than the width dimension W1 when viewed from the front. It becomes wide width dimension W2. For this reason, in the light guide 22 in which a part of the continuous emission surface 77 is curved backward toward the lamp side, the end portion 75a of the reflection surface 75 that is not conspicuous in front view even when the lamp is turned on is oblique. When viewed from the front, it may become conspicuous as the dark portion D, which may affect the appearance of the lamp.

  Therefore, in the vehicular lamp 10 according to the present embodiment, the diffusion surface on the rear side of the reflecting surface 75 including the end portion 75a that may be recognized as the dark portion D when viewed from the diagonally forward direction of the lamp in the plate-like light guide 22. 31a is provided. Thereby, a part L3 of the light emitted from the semiconductor light emitting element 21 is reflected by the surface of the light guide protrusion 76 and then diffused by the diffusion surface 31a of the FPC 31. A part L3a of the light diffused by the diffusing surface 31a enters the light guide 73 from the end 75a of the reflecting surface 75 and is emitted from a part of the continuous emitting surface 77. Accordingly, when viewed from diagonally forward, the diffusing surface 31a appears bright through the end portion 75a of the reflecting surface 75, and the end portion 75a of the reflecting surface 75 has a feeling of lighting close to its surroundings and is not easily recognized as the dark portion D. Therefore, the appearance of the light exit surface 74 of the light guide 22 can be improved, and the entire continuous light exit surface 77 can be seen to shine uniformly, so that the appearance of the lamp during lighting can be improved.

  In addition, since the diffusion surface 31a is configured using the FPC 31 that is a member on which the semiconductor light emitting element 21 is installed, a limited design space can be used effectively.

  Moreover, in the structure which has the part which the light guide 22 was bent upwards and was raised, it is a lamp through the light guide 22 by side view in the part which this light guide 22 was started and arrange | positioned upwards. The inside is easily visible as a dark part. However, in the vehicular lamp 10 according to the present embodiment, the diffusing surface 81a of the diffusing plate 81 is provided on the center side of the vehicle at the portion where the light guide 22 is bent upward and is raised in the vertical direction. .

  Thereby, at the time of non-lighting, as shown to Fig.4 (a), the light (external light L) from the exterior of a lamp injects into the inside of the light guide 22 from a part of output surface 74, The light is diffused by the diffusion surface 81 a of the diffusion plate 81. Thereafter, a part of the diffused light enters the light guide 22 again and is emitted from a part of the emission surface 74. For this reason, it is difficult to recognize the inside (center side) of the lamp as the dark portion D when viewed from the outside of the lamp. Therefore, the appearance of the exit surface 74 of the light guide 22 when not lit can be improved, and the appearance of the lamp can be improved.

  Further, at the time of lighting, as shown in FIG. 4B, after a part L of the light emitted from the semiconductor light emitting element 21 is reflected between the diffusion plate 81 and the surface of the light guide 22. The light is diffused by the diffusion plate 81. A part of this light enters the light guide 22 and is emitted from a part of the emission surface 74. For this reason, it is difficult to recognize the inside (center side) of the lamp as the dark portion D as seen from the outside of the lamp even when the lamp is lit. In this way, it is possible to make the light guide 22 rise up and to make it appear as if the portion arranged in the vertical direction is shining, and the appearance can be improved.

  In the above embodiment, the diffusing surface 31a is provided on the entire rear side of the reflecting surface 75. However, the diffusing surface 31a is not necessarily provided on the entire rear side of the reflecting surface 75. You may provide in the back side in the part in which the dark part D of the surface 75 is formed.

  In the above embodiment, the FPC 31 having the diffusion surface 31a is provided, but the reflection surface 75 itself may be a diffusion surface. In this case, at least a part of the reflection surface 75 may be painted white by, for example, screen printing.

  Further, the diffusing surface 31a is not limited to being whitened by painting or the like, but may be a material that diffuses light by evaporating a metal such as aluminum or applying a texture process.

Next, various modifications will be described.
In addition, the same components as the vehicular lamp 10 according to the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

(Modification 1)
FIG. 6 is a plan view of a part of the lamp unit 20 of the vehicular lamp 10 according to the first modification.
As shown in FIG. 6, the first modification includes the light guide 22 </ b> A having a planar connection surface 85 that connects the reflection surfaces 75 of the light guide unit portions 70 adjacent to each other along the adjacent direction. Yes. The connection surface 85 is a reflection surface 75 of the light guide unit 70 disposed on the rear side of the lamp in a portion where a part of the continuous emission surface 77 of the light guide 22A is curved backward toward the lamp side. It is formed continuously. In the first modification, the diffusion surface 31a of the FPC 31 provided on the rear side of the reflection surface 75 of each light guide unit 70 of the light guide 22A extends to the rear side of the connection surface 85. The diffusion surface 31a is also arranged on the rear side.

  Since the connection surface 85 that connects each reflection surface 75 is not designed as an optical control surface, much of the light from the semiconductor light emitting element 21 does not reach and is easily recognized as a large dark portion D. In particular, the connection surface 85 is more likely to be visually recognized as a dark part when viewed from the direction intersecting the exit axis Ax direction of the lamp that is on the side of the vehicle.

  However, according to the first modification, the diffusion surface 31 a is provided to the rear side of the connection surface 85 together with the reflection surface 75 even in the structure having the connection surface 85 that connects each reflection surface 75 of each light guide unit 70. It has been. For this reason, even when the lamp is viewed from a direction that intersects the emission axis Ax direction when the lamp is not lit and when the lamp is lit, the connection surface 85 is not easily recognized as the dark portion D, and the appearance of the lamp can be improved.

Also in the first modification, the diffusing surface 31a does not necessarily have to be provided on the entire rear side of the reflecting surface 75 and the connecting surface 85. For example, the portion where the dark portion D of the reflecting surface 75 and the connecting surface 85 is easily formed. What is necessary is just to provide in the back side.
In the first modification, the FPC 31 having the diffusing surface 31a is provided, but the reflecting surface 75 and the connection surface 85 themselves may be used as the diffusing surface.

(Modification 2)
FIG. 7 is a plan view of a part of the lamp unit 20 of the vehicular lamp 10 according to the second modification.
As shown in FIG. 7, in the second modification, a diffusion plate 91 is provided on the rear side of the reflection surface 75. The diffusion plate 91 has a surface on the light guide 22 side that is painted white by, for example, silk screen printing to form a diffusion surface 91a. Thereby, in this modification 2, the diffusion surface 91a which diffuses and reflects light is provided on the rear side of the reflection surface 75 of each light guide unit section 70. For this reason, part of the light L <b> 4 emitted from the semiconductor light emitting element 21 is reflected between the diffusion plate 91 and the surface of the light guide protrusion 76 and then diffused by the diffusion plate 91. A part L4a of this light enters the light guide 73 from the end 75a of the reflection surface 75 and is emitted from a part of the continuous emission surface 77. Therefore, in the end portion 75a of the reflection surface 75 that is easily recognized as the dark portion D, there is a lighting feeling close to the periphery thereof, the dark portion D becomes difficult to be recognized, and the appearance of the emission surface 74 of the light guide 22 is improved. Can do. As described above, in this example, in addition to using external light or using light reflected from the surface of the light guide protrusion 76, light diffused from the diffusion plate 91 is used in the direction of the emission axis Ax. Even when the lamp is viewed from the direction intersecting, the diffusing surface 91a can improve the appearance of the lamp when not lit and when lit.

  In the first modification having the connection surface 85, a diffusion plate 91 having a diffusion surface 91a may be provided instead of the diffusion surface 31a of the FPC 31. In this case, the diffusion surface 91 a of the diffusion plate 91 is provided to the rear side of the connection surface 85 together with the reflection surface 75. Thereby, even if it looks at a lamp from the direction which cross | intersects with respect to an output-axis direction, the dark part D of the reflective surface 75 or the connection surface 85 cannot be recognized easily, and it can improve appearance.

  The present invention is not limited to the above-described embodiments and modifications, and modifications, improvements, etc. can be made as appropriate. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, although the vehicular lamp 10 of the above embodiment has been described by taking a day / night lighting lamp of the vehicle as an example, the type of the lamp is not limited thereto. The present invention can also be applied to lamps for other uses such as stop lamps, tape lamps, and other marker lamps, vehicle width lamps, and headlamps.

10: Vehicle lamp 21: Semiconductor light emitting element 22: Light guide 31: Flexible printed circuit board (FPC)
31a, 91a: Diffusing surface 70: Light guiding unit 71, 72: Incident surface 73: Light guiding portion 74: Light exiting surface 75: Reflecting surface 75a: Reflecting surface end 77: Continuous light exiting surface 85: Connection surface D: Dark portion

Claims (4)

An incident surface on which light is incident, a light guide unit that guides light incident on the incident surface, an exit surface that emits light guided by the light guide unit, and an incident surface that is incident from the incident surface A light guide that is provided with a plurality of light guide unit portions adjacent to each other, and a reflective surface that reflects part of the light guided through the light guide portion toward the front of the lamp;
A semiconductor light emitting element that is provided at a position facing the incident surface of each light guide unit and emits light to the incident surface;
With
The light guide is
The light guide unit is formed in a plate shape extending along the adjacent direction,
The emission surface of each light guide unit portion is connected in the adjacent direction, and has a strip-like continuous emission surface extending in the adjacent direction,
A part of the continuous emission surface is curved backward toward the lamp side,
A vehicular lamp having a diffusion surface that diffuses and reflects light on at least a part of the reflection surface or on the rear side of the reflection surface. The plurality of semiconductor light emitting elements are provided on a flexible printed circuit board whose surface is painted white,
The vehicular lamp according to claim 1, wherein a surface of the flexible printed board is the diffusion surface. The light guide has a connection surface that connects the reflection surfaces of the light guide unit portions adjacent to each other along the adjacent direction,
The vehicular lamp according to claim 1 or 2, wherein the diffusion surface extends to at least a part of the connection surface or a rear side of the connection surface. The light guide has a portion extending upward or downward of the lamp toward the lamp side, and a diffusing member for diffusing and reflecting light is provided on the opposite side of the lamp from the lamp side. The vehicular lamp according to any one of claims 1 to 3.

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