JP2019145327A - Lighting appliance for vehicle - Google Patents

Abstract

To provide a lighting appliance for a vehicle which can make its appearance favorable when making a long-length light guide body emit light.SOLUTION: A lighting appliance 1 for a vehicle comprises a light source, a long-length light guide body 3 for guiding light which is emitted from the light source, and a holding part 14 to which a part of the light guide body 3 is held. The lighting appliance makes the light emitted from the light source incident therein from a base end side of the light guide body 3, guides the light toward a tip side of the light guide body while repeating the reflection of the light in the light guide body 3, and makes a light emission part 11 arranged at a front face 3c side of the light guide body 3 emit light by emitting the light which is reflected by a plurality of the reflection parts arranged at a back face side of the light guide body 3 from the front face 3c side of the light guide body 3. The light guide body 3 has an extension part 12 extended toward the back face side from an upper face side of the light guide body, the extension part 12 is continuously arranged over a region L corresponding to at least the light emission part 11, and the holding part 14 has a groove part 14a into which the extension part 12 is inserted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicular lamp.

  2. Description of the Related Art Conventionally, as a vehicular lamp mounted on a vehicle, a combination of a light source such as a light emitting diode (LED) and a long light guide is known (see, for example, Patent Document 1 below). .

  In such a vehicular lamp, light emitted from a light source is incident from the proximal end side of the light guide, and light is guided toward the distal end side of the light guide while being repeatedly reflected inside the light guide. In addition, the light reflected by the plurality of reflection cuts provided on the back surface of the light guide is emitted from the front surface of the light guide to emit light in a line shape on the light emitting portion provided on the front side of the light guide It is possible to make it.

JP 2017-45522 A

  By the way, when the long light guide described above is fixed to a bracket or extension on the back side, a plurality of extending portions extending from the top surface side to the back side of the light guide body are arranged in the longitudinal direction of the light guide body. It is arranged side by side in the direction, and these extending portions are fixed to a fixing portion provided on the bracket or extension side.

  However, in such a light guide fixing structure, part of the light reflected by each extending part may be emitted toward the front side of the light guide as leakage light. When leaked light occurs, there is a problem that the portion where the leaked light appears is more intense than the surroundings, that is, the appearance from the upper side is deteriorated due to so-called flashing. Therefore, in a conventional vehicular lamp, this portion is covered with an extension or the like to shield leaked light.

  The present invention has been proposed in view of such conventional circumstances, and an object of the present invention is to provide a vehicular lamp that can improve the appearance when a long light guide is made to emit light. And

In order to achieve the above object, the present invention provides the following means.
[1] a light source;
A long light guide for guiding light emitted from the light source;
A holding part for holding a part of the light guide,
While the light emitted from the light source is incident from the proximal end side of the light guide, and while repeating reflection inside the light guide, the light is guided toward the distal end side of the light guide, A vehicle that emits light reflected from a plurality of reflecting portions provided on the back side of the light guide from the front side of the light guide to cause the light emitting unit provided on the front side of the light guide to emit light A lamp,
The light guide has an extending portion extending from the upper surface side toward the back surface side,
The extending portion is continuously provided over at least a region corresponding to the light emitting portion,
The vehicle lamp according to claim 1, wherein the holding portion includes a groove portion into which the extension portion is inserted.
[2] A reflector that is disposed to face the back surface of the light guide and reflects light emitted to the outside from the back surface of the light guide toward the back surface of the light guide. The vehicular lamp according to [1].
[3] A bracket including the holding portion and the reflector is provided,
The light source is attached to the back side of the bracket;
The vehicular lamp according to [2], wherein the light guide is attached to a front side of the bracket.
[4] The vehicular lamp according to any one of [1] to [3], further including an extension that covers a front side of the light guide body excluding at least the light emitting section and the extending section. .

  As described above, according to the present invention, it is possible to provide a vehicular lamp that can improve the appearance when a long light guide is caused to emit light.

It is a perspective view showing composition of a vehicular lamp concerning one embodiment of the present invention. It is a disassembled perspective view which shows the structure of the vehicle lamp shown in FIG. FIG. 2 is a vertical sectional view of the vehicular lamp along line AA shown in FIG. 1. It is a horizontal sectional view of the vehicle lamp in the enclosure part B shown in FIG. It is a vertical sectional view of the vehicular lamp along line C-C shown in FIG. It is a horizontal sectional view of the vehicle lamp in the enclosure part D shown in FIG. It is a vertical sectional view of the vehicular lamp along line EE shown in FIG. FIG. 2 is a horizontal sectional view of the vehicular lamp in an enclosed part F shown in FIG. 1. It is a vertical sectional view which expands and shows a part of vehicle lamp shown in FIG. It is a horizontal sectional view which expands and shows a part of vehicle lamp shown in FIG. A case where a plurality of reflecting portions and a plurality of diffusing portions are arranged at the same interval is shown, (a) is a schematic diagram showing the front and cross section of the light guide, and (b) is a schematic showing the front and cross section of the reflector. FIG. A case where a plurality of reflecting portions and a plurality of diffusing portions are arranged at different intervals is shown, (a) is a schematic view showing the front and cross section of the light guide, and (b) is a schematic showing the front and cross section of the reflector. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make each component easy to see, the scales of the dimensions may be different depending on the component, and the dimensional ratio of each component is not always the same as the actual. Absent.

As one embodiment of the present invention, for example, a vehicle lamp 1 shown in FIGS. 1 to 10 will be described.
FIG. 1 is a perspective view showing the configuration of the vehicular lamp 1. FIG. 2 is an exploded perspective view showing the configuration of the vehicular lamp 1. FIG. 3 is a vertical sectional view of the vehicular lamp 1 taken along line AA shown in FIG. FIG. 4 is a horizontal cross-sectional view of the vehicular lamp 1 in the encircled portion B shown in FIG. FIG. 5 is a vertical sectional view of the vehicular lamp 1 taken along line C-C shown in FIG. FIG. 6 is a horizontal sectional view of the vehicular lamp 1 in the enclosing portion D shown in FIG. FIG. 7 is a vertical sectional view of the vehicular lamp 1 taken along line EE shown in FIG. FIG. 8 is a horizontal cross-sectional view of the vehicular lamp 1 in the enclosed portion F shown in FIG. FIG. 9 is an enlarged vertical sectional view showing a part of the vehicular lamp 1. FIG. 10 is an enlarged horizontal sectional view showing a part of the vehicular lamp 1.

  In the drawings shown below, an XYZ orthogonal coordinate system is set, the X-axis direction is the front-rear direction (length direction) of the vehicle lamp, the Y-axis direction is the left-right direction (width direction) of the vehicle lamp, and the Z-axis direction. Are shown as the vertical direction (height direction) of the vehicular lamp 1.

  The vehicular lamp 1 according to the present embodiment applies the present invention to, for example, a direction indicator mounted at both corner portions on the front end side of the vehicle (not shown) (in this embodiment, the corner portion on the right front end side). It is a thing.

  In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to when the vehicle lamp 1 is viewed from the front (front of the vehicle) unless otherwise specified. Means the respective directions.

  Specifically, as shown in FIGS. 1 to 8, the vehicular lamp 1 includes a light source 2, a light guide 3, a bracket 4, and an extension 5, and is provided on the back surface (rear surface) side of the bracket 4. The light source 2 is attached, and the light guide 3 and the extension 5 are attached to the front (front) side of the bracket 4.

  Although not shown, the vehicular lamp 1 is housed inside the lamp body together with a vehicular headlamp (head lamp), a vehicle width lamp (position lamp), and a daytime lighting lamp (DRL). And it is arrange | positioned at the corner part of the right front end side of a vehicle.

  The light source 2 is composed of, for example, an LED that emits orange light (hereinafter simply referred to as light). Moreover, the thing of the high output (high brightness) type for vehicle illumination is used for LED. The light source 2 is mounted on the front side of the circuit board 6 provided with a drive circuit for driving the light source 2, and emits light radially toward the front (+ X axis direction).

  A heat sink 7 for radiating heat generated by the light source 2 is attached to the back side of the circuit board 6. The heat sink 7 is made of a metal material having high thermal conductivity, an insulating resin material, or a composite material thereof. A pair of positioning pins 8 a and screw holes 8 b for fixing the circuit board 6 are provided on the front surface of the heat sink 7. On the back surface of the heat sink 7, a plurality of fin portions 7a for improving heat dissipation are provided side by side in the width direction (Y-axis direction).

  The circuit board 6 has a pair of positioning holes 9a and through-holes 9b on both sides in the width direction across the light source 2 corresponding to each of the pair of positioning pins 8a and screw holes 8b. The circuit board 6 is fixed to the front surface of the heat sink 7 by passing the positioning pins 8a through the positioning holes 9a and screwing screws (not shown) into the screw holes 8b through the through holes 9b. The circuit board 6 is attached in a state of being electrically insulated from the heat sink 7 through heat conduction grease (not shown) provided in front of the heat sink 7. The heat sink 7 is attached to the back side of the bracket 4 to be described later with the circuit board 6 attached.

  The light guide 3 is formed as an inner lens of the vehicular lamp 1 in a long shape (in the present embodiment, a rod shape) disposed in front of the light source 2. The light guide 3 is extended forward from a position facing the light source 2 and then curved while being curved from the outside (−Y axis side) to the inside (+ Y axis side) in the vehicle width direction (Y axis direction). ). Moreover, the light guide 3 has a substantially circular shape in cross-sectional shape (cross-sectional shape orthogonal to the axial direction) across the axial direction. For the light guide 3, a material having a refractive index higher than that of air, such as transparent resin such as polycarbonate and acrylic, or glass can be used.

  In the light guide 3, light emitted from the light source 2 is incident from one end surface (hereinafter referred to as an incident surface) 3 a on the base end side, and light is guided toward the distal end side while being repeatedly reflected inside. At the same time, by emitting light reflected from the plurality of reflecting portions 10 provided on the back surface 3b side from the front surface 3c side, the light emitting portion 11 provided on the front surface 3c side is caused to emit light.

  The plurality of reflecting portions 10 extend over a predetermined area (hereinafter referred to as a light emitting area L) of a portion of the light guide 3 that extends from the outside in the vehicle width direction toward the inside. It is provided side by side periodically.

  The plurality of reflecting portions 10 are formed by prism cuts in which a central portion on the back surface 3b side of the light guide 3 is cut out in a vertical direction (Z-axis direction) with a predetermined dimension. Specifically, the prism cut includes a first cut surface 10a, a second cut surface 10b, and a third cut surface 10c, and the first cut surface 10a, the second cut surface 10b, and the third cut surface. The cut surface 10c of the light guide 3 is repeatedly arranged in the axial direction.

  That is, the first cut surface 10 a is cut out so as to be inclined toward the front surface 3 c side of the light guide 3. The second cut surface 10b is cut out so as to be continuous with the top side of the first cut surface 10a and parallel to the front surface 3c of the light guide 3. The third cut surface 10c is notched at a steeper angle than the first cut surface 10a so as to connect the bottom side of the first cut surfaces 10a adjacent to each other and the second cut surface 10b. Yes.

  In addition, about the 2nd cut surface 10b, it is good also as a structure abbreviate | omitted in a part of reflection part 10. FIG. In that case, the bottom side of the first cut surfaces 10a adjacent to each other and the third cut surface 10c are connected.

  The reflection unit 10 reflects light guided inside the light guide 3 toward the front surface 3c side of the light guide 3 by the first cut surface 10a. On the other hand, the reflection unit 10 transmits light incident from the back surface 3b side of the light guide 3 toward the front surface 3c side of the light guide 3 through the second cut surface 10b.

  The light emitting unit 11 has a light emitting surface 11 a that emits light in a line shape in the light emitting region L on the front surface 3 c side of the light guide 3. The light emitting surface 11a emits light from the front surface 3c while diffusing in the vertical direction because the front surface 3c side of the light guide 3 has a substantially arcuate convex shape in the vertical direction.

  The light guide 3 has an extending portion 12 that extends from the upper surface side to the back surface side of the light guide body 3. The extending part 12 is continuously provided in a substantially rectangular flat plate shape over at least the area corresponding to the light emitting part 11 (light emitting area L). In the present embodiment, the extending portion 12 is provided over substantially the entire region of the light guide 3 that extends from the outside in the vehicle width direction toward the inside so as to be wider than the light emitting region L. .

  The bracket 4 is made of a long resin molded body, and is disposed to face the back surface 3 b side of the light guide 3. The bracket 4 includes a first attachment portion 13 to which the light guide 3, the extension 5 and the heat sink 7 are attached, and a holding portion 14 to hold the extension portion 12 (a part of the light guide 3) of the light guide 3. And a reflector 15 that reflects light emitted to the outside from the back surface 3b of the light guide 3 toward the back surface 3b of the light guide 3.

  The first mounting portion 13 is located outside in the vehicle width direction, and includes a pair of flange portions 16 provided with positioning holes 16a and through-holes 16b, and a pair of boss portions 17 provided with screw holes 17a. Have.

  Correspondingly, a pair of flange portions 18 including a positioning hole 18a and a through hole 18b are provided on the proximal end side of the light guide 3 so as to protrude in the vehicle width direction. The extension 5 has a pair of flange portions 19 provided with positioning holes 19a and through-holes 19b, located on the outer side in the vehicle width direction. The extension 5 has an extended flange portion 20 that extends forward from the tip of the inner flange portion 19 and then extends further inward while being bent. The extension flange portion 20 is provided with a pair of through holes 20a.

  On the other hand, a pair of pedestal portions 21 including positioning pins 21 a and screw holes 21 b are provided on the front surface of the heat sink 7 so as to protrude forward from both sides in the vehicle width direction across the circuit board 6.

  In the first mounting portion 13, the flange portion 18 of the light guide 3 is sandwiched between the flange portion 16 of the bracket 4 and the flange portion 19 of the extension 5 in the front-rear direction (X-axis direction). In this state, the positioning holes 21a, 16a, 19a of the flange portions 18, 16, 19 are passed through the positioning pins 21a of the pedestal portion 21, and the through holes 18b, 16b of the flange portions 18, 16, 19 are inserted. , 19b and screws 22a are screwed into the screw holes 21b of the base 21. In the first attachment portion 13, the screw 22 b is screwed into the screw hole 17 a of the boss portion 17 through the through hole 20 a of the extension flange portion 20. Thereby, the heat sink 7 is integrally attached to the back side of the bracket 4, and the light guide 3 and the extension 5 are integrally attached to the front side of the bracket 4.

  The holding part 14 has a groove part 14 a into which the extension part 12 is inserted in the upper part on the front side of the bracket 4. The groove portion 14a is provided continuously in the longitudinal direction (Y-axis direction) of the bracket 4 so as to hold the extending portion 12 over at least a region corresponding to the light emitting portion 11 (light emitting region L). In the present embodiment, the extending portion 12 is provided over the entire area where the extending portion 12 is held.

  The reflector 15 has a reflecting surface 15a that is located below the groove 14a (holding portion 14) and reflects light emitted to the outside from the back surface 3b of the light guide 3 toward the back surface 3b of the light guide 3. doing. The reflection surface 15 a is formed by providing a metal reflection film such as aluminum on the surface of the bracket 4 facing the back surface 3 b of the light guide 3.

  The reflective surface 15a is provided continuously in the longitudinal direction of the bracket 4 so as to face the back surface 3b of the light guide 3 over at least a region corresponding to the light emitting unit 11 (light emitting region L). In the present embodiment, the reflecting surface 15a is provided over substantially the entire region in the longitudinal direction of the bracket 4 so as to be wider than the light emitting region L.

  Furthermore, since the back surface 3b side of the light guide 3 has a substantially arcuate convex shape in the vertical direction, the reflecting surface 15a has a substantially arcuate concave shape in the vertical direction along the back surface 3b of the light guide 3. have. Thereby, the reflector 15 reflects the light incident on the reflecting surface 15a while converging it in the vertical direction toward the front.

  The reflector 15 has a plurality of diffusion portions 23 that reflect the light emitted to the outside from the back surface 3 b of the light guide 3 while diffusing the light toward the back surface 3 b of the light guide 3. The plurality of diffusion portions 23 are provided periodically in the longitudinal direction of the bracket 4 over at least the region corresponding to the light emitting portion 11 (light emitting region L). In the present embodiment, the diffusing portion 23 is provided over almost the entire region in the longitudinal direction of the bracket 4 so as to be wider than the light emitting region L.

  The plurality of diffusing portions 23 include a groove portion in which the front side of the reflecting surface 15a (reflector 15) is cut out in a vertical direction with a predetermined dimension T1. Specifically, the groove has a substantially arcuate concave shape in the vertical direction. As a result, as shown in FIG. 9, the diffusing unit 23 reflects the light incident on the groove while converging in the vertical direction toward the front. In addition, the focal point (condensing point) F in the vertical direction of the diffusing unit 23 is located in front of the central axis S of the light guide 3.

  Moreover, as shown in FIG. 10, the groove part has a substantially arc-shaped concave surface shape in the width direction. Thereby, the diffuser 23 reflects the light incident on the groove while diffusing in the width direction toward the front.

  As shown in FIGS. 1 to 8, the extension 5 is made of a long resin molded body, and constitutes a decorative surface whose front side is painted black. The extension 5 is disposed on the front surface 3c side of the light guide 3 so as to cover at least a part of the light guide 3 excluding the light emitting part 11 and the extending part 12.

  Specifically, the extension 5 includes a first shielding portion 5 a that covers the proximal end side of the light guide 3, an opening 5 b that exposes the light emitting portion 11 and the extending portion 12 to the outside, and the light guide 3. And a second shielding portion 5c that covers the distal end side.

  The first shielding portion 5a covers the curved portion of the light guide 3 from the base end side of the light guide 3, thereby shielding light leaked from this portion. The opening 5 b defines the light emitting region L of the light guide 3. The second shielding part 5c shields the leaked light from this part by covering the distal end side of the light guide 3.

  The extension 5 is held on the front side of the bracket 4 by inserting a step portion 5d provided on the back side of the groove 4a provided on the lower side of the front side of the bracket 4.

  The bracket 4 has a second attachment portion 24 to which the light guide 3 and the extension 5 are attached. The second mounting portion 24 is located on the outer side in the vehicle width direction, the flange portion 25 is provided with the positioning pin 25a and the screw hole 25b, and the screw hole 26a is provided on the inner side in the vehicle width direction. And a boss portion 26.

  Correspondingly, the extension 5 is located on the outer side in the vehicle width direction, and the flange portion 27 provided with the positioning hole 27a and the through hole 27b, and on the inner side in the vehicle width direction, the through hole 28a is provided. And a flange portion 28 provided. The light guide 3 has a flange portion 29 provided with a through hole 29a on the tip side.

  In the second mounting portion 24, the flange portion 25 of the bracket 4 and the flange portion 27 of the extension 5 are overlapped in the vertical direction, and the flange portion 29 of the light guide 3 is connected to the flange portion 25 of the bracket 4 and the flange of the extension 5. It is assumed that the portion 29 is sandwiched in the vertical direction. In this state, the positioning pin 25a of the flange 25 is passed through the positioning hole 27a of the flange 27, and the screw 30a is screwed into the screw hole 25b of the flange 25 through the through-hole 27b of the flange 27. Further, a screw 30b is screwed into the screw hole 26a of the boss portion 26 through the through holes 28a, 29a of the flange portions 28, 29. Thereby, the light guide 3 and the extension 5 are integrally attached to the front side of the bracket 4.

  The vehicular lamp 1 is located at a substantially central portion on the back side of the bracket 4 and the flange portion 29 side of the extension 5, and has mounting flange portions 31 a and 31 b for mounting the vehicular lamp 1 inside the lamp body. Have. In the vehicular lamp 1, not only the arrangement of the mounting flange portions 31 a and 31 b but also the arrangement and number of the mounting flange portions can be changed as appropriate.

  By the way, in the vehicular lamp 1 of the present embodiment, as shown in FIGS. 4 to 8, a plurality of reflecting portions 10 are arranged at regular intervals in the axial direction of the light guide 3, and the reflecting portion The amount of light reflected by 10 and emitted from the front surface 3 c side of the light guide 3 is adjusted so as to gradually increase from the proximal end side to the distal end side of the light guide 3.

  Specifically, in the vehicular lamp 1 according to the present embodiment, the depth D of the prism cut that configures the reflecting portion 10 is adjusted so as to gradually increase from the proximal end side to the distal end side of the light guide 3. Yes. The prism cut depth D represents the distance between the top and bottom of the first cut surface 10 a in the direction orthogonal to the axial direction of the light guide 3.

  For example, in this embodiment, the depth D of the prism cut on the base end side of the light guide 3 shown in FIG. 4 is 0.1 mm, and the depth D of the prism cut on the center side of the light guide 3 shown in FIG. The depth D of the prism cut on the distal end side of the light guide 3 shown in FIG. 8 is 1 mm, and the depth D of the prism cut is continuously from the proximal end side of the light guide 3 toward the distal end side. It has been adjusted to change.

  In the reflecting portion 10, as the prism cut depth D increases, the inclination angle of the first cut surface 10a increases, and the light incident on the first cut surface 10a enters the front surface 3c of the light guide 3. On the other hand, the light is reflected at an angle less than the critical angle (an angle at which light is transmitted from the front surface 3c of the light guide 3).

  Therefore, in the vehicular lamp 1 according to the present embodiment, the light amount of the light guided inside the light guide 3 decreases as it goes from the base end side to the tip end side of the light guide 3. The amount of light reflected from the plurality of reflecting portions 10 (first cut surface 10a) and emitted from the front surface 3c side of the light guide 3 is gradually increased from the proximal end side to the distal end side of the light guide 3. growing. Thereby, the light emitting surface 11a (light emitting unit 11) of the light guide 3 is caused to emit light more uniformly while suppressing the occurrence of luminance unevenness due to the difference in the optical path length of the light guided inside the light guide 3. Is possible.

  Further, in the vehicle lamp 1 according to the present embodiment, the vertical dimension T1 of the prism cut that configures the reflecting portion 10 is adjusted so as to gradually increase from the proximal end side to the distal end side of the light guide 3. Yes.

  For example, in this embodiment, the prism cut dimension T1 on the proximal side of the light guide 3 shown in FIG. 3 is 1 mm, and the prism cut dimension T1 on the center side of the light guide 3 shown in FIG. The prism cut dimension T1 on the distal end side of the light guide 3 shown in FIG. 7 is 2 mm, and the prism cut dimension T1 is adjusted so as to continuously change from the proximal end side to the distal end side of the light guide 3. ing.

  In the reflection part 10, the area of the 1st cut surface 10a becomes large, so that the vertical dimension T1 of this prism cut increases, and it faces toward the front surface 3c side of the light guide 3 by this 1st cut surface 10a. The reflected light will increase.

  Therefore, in the vehicular lamp 1 according to the present embodiment, the light amount of the light guided inside the light guide 3 decreases as it goes from the base end side to the tip end side of the light guide 3. The amount of light reflected by the plurality of reflecting portions 10 (first cut surfaces 10a) gradually increases from the proximal end side to the distal end side of the light guide 3. Thereby, while suppressing the occurrence of luminance unevenness due to the difference in the optical path length of the light guided inside the light guide 3, by the light reflected by the plurality of reflecting portions 10 (first cut surface 10a), The light emitting surface 11a (light emitting unit 11) of the light guide 3 can be made to emit light more uniformly.

  In the vehicular lamp 1 according to the present embodiment, the ratio W1 of the first cut surface 10a in the prism cut that configures the reflecting portion 10 gradually increases from the proximal end side to the distal end side of the light guide 3. And the ratio W2 of the 2nd cut surface 10b is adjusted so that it may become small gradually.

  For example, in this embodiment, the ratio (W1: W2) of the prism cuts W1 and W2 on the base end side of the light guide 3 shown in FIG. 3 is 1 mm: 1 mm, and the center side of the light guide 3 shown in FIG. The ratio of W1 and W2 of the prism cut (W1: W2) in 1.9 is 1.9 mm: 0.1 mm, and the ratio of W1 and W2 of the prism cut on the tip side of the light guide 3 shown in FIG. 7 (W1: W2) 2.0 mm: 0 mm, and the ratio (W1: W2) of W1 and W2 of the prism cut is adjusted so as to continuously change from the proximal end side to the distal end side of the light guide 3.

  In the reflecting portion 10, the first cut surface 10a is gradually increased toward the front surface 3c side of the light guide 3 as the ratio of the first cut surface 10a is gradually increased and the ratio of the second cut surface 10b is gradually decreased. The light reflected will increase.

  Therefore, in the vehicular lamp 1 according to the present embodiment, the light amount of the light guided inside the light guide 3 decreases as it goes from the base end side to the tip end side of the light guide 3. The amount of light reflected by the plurality of reflecting portions 10 (first cut surfaces 10a) gradually increases from the proximal end side to the distal end side of the light guide 3. Thereby, while suppressing the occurrence of luminance unevenness due to the difference in the optical path length of the light guided inside the light guide 3, by the light reflected by the plurality of reflecting portions 10 (first cut surface 10a), The light emitting surface 11a (light emitting unit 11) of the light guide 3 can be made to emit light more uniformly.

  Further, in the vehicular lamp 1 according to the present embodiment, as shown in FIG. 10, the plurality of diffusion portions 23 are provided at the same interval P2 as the interval P1 between the plurality of reflection portions 10 periodically arranged in the axial direction of the light guide 3. They are arranged side by side periodically. For example, in the present embodiment, the interval P1 of the reflection unit 10 and the interval P2 of the diffusion unit 23 are each set to 2 mm.

  Here, FIGS. 11A and 11B show a case where the plurality of reflection units 10 and the plurality of diffusion units 23 are arranged at the same interval (P1 = P2). On the other hand, as a comparative example, FIGS. 12A and 12B show a case where a plurality of reflection units 10 and a plurality of diffusion units 23 are arranged at different intervals (P1 <P2). FIG. 11A and FIG. 12A are schematic views showing the front and cross-section of the light guide 3, respectively. On the other hand, FIG.11 (b) and FIG.12 (b) are the schematic diagrams which show the reflector 15 the front and a cross section, respectively.

  In the vehicular lamp 1 of the present embodiment, by arranging the plurality of reflecting portions 10 and the plurality of diffusing portions 23 at the same interval (P1 = P2), the position of the groove portion constituting the diffusing portion 23 and the reflecting portion 10 are arranged. The position of the second cut surface 10b to be configured can be overlapped (matched) in the front-rear direction. Thereby, it is possible to make the light emission surface 11a (light emission part 11) of the light guide 3 emit light more uniformly, suppressing generation | occurrence | production of a brightness nonuniformity. Further, it is possible to prevent the moire from being generated in the light emitting unit 11 when the light is turned off, and it is possible to improve the appearance of the light emitting unit 11.

  On the other hand, when the plurality of reflecting portions 10 and the plurality of diffusing portions 23 are arranged at different intervals (P1 ≠ P2), the position of the groove portion that constitutes the diffusing portion 23 and the second cut that constitutes the reflecting portion 10 By shifting the position of the surface 10b, uneven brightness may occur when the light is turned on, or moire may occur when the light is turned off.

  Further, in the vehicular lamp 1 according to the present embodiment, as shown in FIGS. 9 and 10, the vertical direction dimension T1 of the prism cut constituting the reflection part 10 is higher than the vertical dimension T1 of the groove part constituting the diffusion part 23. The groove portion has a concave shape so that the dimension T2 is increased. Further, the groove has a substantially arcuate concave shape in the width direction (Y-axis direction).

  For example, in this embodiment, the outer diameter of the light guide 3 is set to 8 mm, the prism cut dimension T1 of the light guide 3 is set to 1 to 2 mm, and the dimension T2 of the groove is set to 8 mm which is the same as the outer diameter of the light guide 3. ing. The depth of the groove is set to 1 mm, and the radius of curvature in the width direction of the groove is set to 0.6 mm.

  Thereby, in the vehicular lamp 1 of the present embodiment, the light B2 reflected by the groove part constituting the diffusing part 23 is more emitted from the light emitting surface 11a than the light B1 reflected by the prism cut constituting the reflecting part 10. The light is emitted in a wide angle range from the (light emitting unit) toward the front of the vehicle.

  For example, in this embodiment, as the direction indicator, high light intensity is required in the outer and inner ranges in the vehicle width direction and the upper and lower ranges in the vehicle vertical direction by the light B1 reflected by the reflecting unit 10. Light distribution in the angular range is possible.

  Moreover, in this embodiment, the light B2 reflected by the diffusing unit 23 enables light distribution in a visible angle range in the outer and inner ranges in the vehicle width direction and the upper and lower ranges in the vehicle vertical direction. It is said.

  Therefore, in the vehicular lamp 1 according to the present embodiment, the visibility in a necessary angle range is ensured, and the appearance from each direction is improved while the visibility in a wider angle range is enhanced. Is possible.

  Moreover, in the vehicle lamp 1 of the present embodiment, as shown in FIGS. 1 to 3, 5, and 7, the extending portion 12 provided continuously over at least the light emitting region L of the light guide 3. Is inserted into the groove portion 14 a (holding portion 14) of the bracket 4, thereby holding the light guide 3 on the bracket 4.

  Thereby, it is possible to stably hold the light emitting portion 11 and the extending portion 12 on the bracket 4 in a state where the light emitting portion 11 and the extending portion 12 are exposed to the outside from the opening 5 b of the extension 5 while increasing the bending strength of the light guide 3. .

  Furthermore, in the vehicular lamp 1 according to the present embodiment, the extension portion 12 can emit light along the vehicle width direction together with the light emitting portion 11 of the light guide 3. Thereby, it is possible to improve the appearance of the light guide 3 from the above without covering the extending portion 12 with the extension 5.

  In addition, about the upper surface of the extension part 12, it is good also as a structure which gave surface processing (unevenness | corrugation processing), such as embossing, a fish-eye cut, a flute cut, for example. Thereby, since the connection part of the extension part 12 with respect to the light guide 3 becomes invisible directly, it is possible to improve appearance. Moreover, the protrusion part protruded toward the front side from the upper surface side of the light guide 3 was provided in the reverse direction to the extension part 12 extended toward the back side from the upper surface side of the light guide body 3. It is good also as a structure. In the case of this configuration, the bending strength of the light guide 3 can be improved. Further, for example, it is possible to improve the appearance by matching the tip of the protrusion with the end of the extension 5.

  As described above, in the vehicular lamp 1 according to the present embodiment, the long light guide 3 can emit light more uniformly and the appearance of the light guide 3 can be improved.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, the reflection unit 10 may be any one that reflects light incident on the back surface 3b of the light guide 3 with respect to the front surface 3c of the light guide 3 at an angle that is less than the critical angle. Not only the configuration but also the shape and the like can be appropriately changed.

  Further, the diffusion portion 23 may be any member that reflects and diffuses light emitted from the back surface 3b of the light guide 3 toward the back surface 3b of the light guide 3. However, the shape and the like can be appropriately changed.

  Furthermore, in the said vehicle lamp 1, it is possible to change suitably the shape of the light guide 3, the bracket 4, the extension 5, etc. according to the design of an actual vehicle, etc.

  In the above embodiment, the vehicular lamp 1 in which the present invention is applied to the above-described direction indicator is illustrated. However, for example, a long light guide such as a vehicle width lamp (position lamp) or a daytime lighting lamp (DRL) is used. The present invention can be widely applied to a vehicular lamp using a body. Moreover, it is good also as a vehicle lamp using the light source of two colors, orange light and white light, combining with the direction indicator mentioned above.

  Furthermore, the vehicular lamp to which the present invention is applied is not limited to the above-mentioned front-side vehicular lamp. It is also possible to apply the present invention to the side vehicle lamp.

  In addition to the LED described above, for example, a light emitting element such as a laser diode (LD) can be used for the light source 2. Further, the color of light emitted from the light emitting element is not limited to the red light described above, but can be appropriately changed according to the use of the light source 2 such as white light and orange light.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Light source 3 ... Light guide 4 ... Bracket 5 ... Extension 6 ... Circuit board 7 ... Heat sink 10 ... Reflection part 10a ... 1st cut surface 10b ... 2nd cut surface 10c ... 3rd cut Surface 11 ... Light emitting portion 12 ... Extending portion 13 ... First mounting portion 14 ... Holding portion 14a ... Groove portion 15 ... Reflector 23 ... Diffusion portion 24 ... Second mounting portion L ... Light emitting region

Claims (4)

A light source;
A long light guide for guiding light emitted from the light source;
A holding part for holding a part of the light guide,
While the light emitted from the light source is incident from the proximal end side of the light guide, and while repeating reflection inside the light guide, the light is guided toward the distal end side of the light guide, A vehicle that emits light reflected from a plurality of reflecting portions provided on the back side of the light guide from the front side of the light guide to cause the light emitting unit provided on the front side of the light guide to emit light A lamp,
The light guide has an extending portion extending from the upper surface side toward the back surface side,
The extending portion is continuously provided over at least a region corresponding to the light emitting portion,
The vehicle lamp according to claim 1, wherein the holding portion includes a groove portion into which the extension portion is inserted.   2. A reflector disposed opposite to the back surface of the light guide and reflecting light emitted to the outside from the back surface of the light guide toward the back surface of the light guide. The vehicle lamp as described in 2. A bracket including the holding portion and the reflector;
The light source is attached to the back side of the bracket;
The vehicular lamp according to claim 2, wherein the light guide is attached to a front side of the bracket.   The vehicular lamp according to any one of claims 1 to 3, further comprising an extension that covers a front side of the light guide body excluding at least the light emitting section and the extending section.

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