JP2019050131A - Vehicle lamp - Google Patents

Abstract

To provide a vehicle lamp capable of emitting light at good appearance.SOLUTION: A light guide body 3 includes a transmission part 13 for transmitting one part of light L1 reflected by a reflection part 12 toward a reflector 4, a step part 14 for reflecting one part of light L2 reflected by the reflection part 12, and transmitting the light L1 reflected by the reflector 4, and an emission part 15 for emitting the light L2 and the light L1 outward. The step part 14 includes plural inclined faces 14a for reflecting the light L2 reflected by the reflection part 12 toward the emission part 15, and plural step faces 14b positioned between the plural inclined faces 14a and transmitting the light L1 reflected by the reflector 4 toward the emission part 15. The emission part 15 includes plural first light emission regions 15a for emitting light by the light L2 reflected by the plural inclined faces 14a, and plural second light emission regions 15b positioned between the plural first light emission regions 15a and emitting light by the light L1 transmitted through the plural step faces 14b.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle lamp.

  Conventionally, as a vehicle lamp mounted on a vehicle, a combination of a light source such as a light emitting diode (LED) and a light guide such as an inner lens is known (see, for example, Patent Document 1 below). ).

  In such a vehicle lamp, the light emitted from the light source is made to enter from one end of the light guide to the inside, and the light is guided toward the other end of the light guide while being repeatedly reflected inside the light guide. While the light is being emitted, the light is reflected by a plurality of reflection cuts provided on the back surface (one surface) of the light guide to diffuse the light reflected by each reflection cut while the front surface of the light guide The light emitting surface provided on the other surface is made to emit light substantially uniformly.

  On the other hand, in the vehicle lamp, depending on the shape of the light guide, the light distribution pattern, and the like, part of the light may leak from the back surface of the light guide without being reflected by the plurality of reflection cuts. Therefore, a reflector is provided at a position facing the back surface of the light guide, and light leaking from the back surface of the light guide is reflected by the reflector and returned to the inside of the light guide.

  For example, in the vehicle lamp described in Patent Document 1 below, the reflector is provided with a plurality of reflection cuts, and the reflection direction of light leaked from the back surface of the light guide is controlled by the plurality of reflection cuts. It is proposed to improve the utilization efficiency of the light emitted from the light source by returning it to the inside.

JP, 2011-198537, A

  However, in the vehicle lamp described in Patent Document 1 described above, the reflection cut on the light guide side and the reflection cut on the reflector side are reflected on the light emitting surface in a superimposed state, and thus the appearance becomes worse. there were.

  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 capable of emitting light with a good appearance.

In order to achieve the above object, the present invention provides the following means.
[1] light source,
A light guide for guiding light from the light source;
And a reflector provided on the back side of the light guide,
The light guide includes an incident portion through which light emitted from the light source is incident, a reflecting portion that reflects light incident from the incident portion, and part of light reflected by the reflecting portion. A transmitting portion transmitting toward the reflector, a step portion reflecting a part of the light reflected by the reflecting portion, and transmitting the light reflected by the reflector, the light reflected by the step portion and the light And an emitting portion for emitting light transmitted through the stepped portion to the outside,
The stepped portion is positioned between a plurality of inclined surfaces that reflect the light reflected by the reflection portion toward the emission portion, and the plurality of inclined surfaces, and the light reflected by the reflector is And a plurality of step surfaces which transmit toward the emission portion;
The emission unit is positioned between each of a plurality of first light emitting regions that emit light by light reflected by the plurality of inclined surfaces and each of the plurality of first light emitting regions, and transmits the plurality of step surfaces. And a plurality of second light emitting areas that emit light by the light.
[2] The vehicular lamp according to the above [1], wherein the reflector includes a diffuse reflection surface that reflects the light transmitted through the transmission portion toward the stepped portion.
[3] The light guide has a first light guide including the incident portion, and a second light guide including the reflection portion, the transmission portion, the step portion, and the emission portion.
The first light guide portion injects the light emitted from the light source into the interior from the incident portion provided at one end of the first light guide portion, and the light guide portion is formed in the first light guide portion. The light is guided toward the other end of the first light guide while repeating the reflection, and the light reflected by the plurality of reflection cuts provided on one surface of the first light guide is the second light. The light is emitted from the other surface of the light guide 1 to the outside,
The second light guiding portion receives light emitted from the other surface of the first light guiding portion from one surface of the second light guiding portion to the inside, and guides the light toward the reflecting portion. The vehicle lamp according to the above [1] or [2], characterized in that
[4] The vehicle according to the above [3], wherein the other surface of the first light guide portion and one surface of the second light guide portion are disposed to face each other with an air layer interposed therebetween. Lamp.
[5] The second light guiding portion is inclined in a direction in which the outside recedes from the inside in the vehicle width direction with respect to the traveling direction of the light guided toward the emitting portion,
The vehicle lamp according to any one of the above [2] to [4], wherein the reflector is disposed along the inclination of the second light guide portion.
[6] The vehicular lamp according to any one of the above [2] to [5], wherein the reflector includes a light shielding portion which covers the periphery of the first light guiding portion.
[7] The light guide includes a third light emitting region that emits light by emitting a part of light incident from the incident portion to the outside from a position different from the emitting portion. The vehicle lamp according to any one of [1] to [6].

  As described above, according to the present invention, it is possible to provide a vehicular lamp capable of emitting light with a good appearance.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows schematic structure of the vehicle lamp which concerns on one Embodiment of this invention. It is sectional drawing to which the principal part of the vehicle lamp shown in FIG. 1 was expanded. It is a perspective view which shows the light source and light guide with which the vehicle lamp shown in FIG. 1 is provided. It is a schematic diagram which shows the light emission pattern of the light radiate | emitted from the output part of a light guide. It is a luminance distribution figure of the light emission pattern shown in FIG. It is sectional drawing which shows the modification of the vehicle lamp shown in FIG. It is sectional drawing which shows the modification of the vehicle lamp shown in FIG. It is sectional drawing which shows the modification of the vehicle lamp shown in FIG. It is sectional drawing which shows the modification of the vehicle lamp shown in FIG. It is sectional drawing which shows the modification of the vehicle lamp shown in 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 scale of dimensions may be shown differently depending on the component, and the dimensional ratio of each component is limited to be the same as the actual Absent.

As an embodiment of the present invention, for example, a vehicle lamp 1 shown in FIG. 1, FIG. 2 and FIG. 3 will be described.
FIG. 1 is a cross-sectional view showing a schematic configuration of the vehicular lamp 1. FIG. 2 is an enlarged cross-sectional view of the main part of the vehicular lamp 1. FIG. 3 is a perspective view showing the light source 2 and the light guide 3 provided in the vehicular lamp 1.

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

  The vehicle lamp 1 of the present embodiment is, for example, a vehicle position lamp (position lamp) mounted at both corners on the front end side of a vehicle (not shown) (in the present embodiment, on the left front end corner). The present invention is applied.

  Specifically, as shown in FIG. 1, the vehicular lamp 1 includes a light source 2, a light guide 3 for guiding light L from the light source 2, and a reflector provided on the back side of the light guide 3. It has approximately 4 and. Further, the vehicular lamp 1 includes the light source 2, the light guide 3 and the reflector 4 in the interior of the lamp body 7 constituted by the housing 5 whose front face is open and the transparent lens cover 6 which covers the opening of the housing 5. Is arranged.

  The light source 2 comprises, for example, a chip LED (SMD LED) that emits white light. In addition, as the chip LED, a high output (high brightness) type for vehicle lighting is used. The light source 2 radiates light L radially toward the light guide 3.

  The light guide 3 has a first light guide 8 which is a light guide pipe and a second light guide 9 which is an inner lens. The light guide 3 has a configuration in which the first light guide 8 and the second light guide 9 are integrated. The light guide 3 may be made of, for example, a transparent resin such as polycarbonate or acrylic, glass, or the like, which is a material having a refractive index higher than that of air.

  The first light guiding portion 8 is formed in a substantially rod shape as a whole as a light guiding pipe, and is extended in the height direction (Z-axis direction) of the vehicular lamp 1. The first light guiding portion 8 injects the light L emitted from the light source 2 into the inside from the incident portion 10 provided at one end 8a of the first light guiding portion 8, and the first light guiding portion The light L is guided toward the other end 8b of the first light guiding portion 8 while being repeatedly reflected inside 8, and provided on the back surface (one surface) 8c of the first light guiding portion 8 The light L reflected by the plurality of reflection cuts 11 is emitted from the front surface (other surface) 8 d of the first light guide portion 8 to the outside.

  The incident part 10 is located at one end 8 a of the first light guiding part 8, and the light L from the light source 2 disposed opposite to the incident part 10 is incident to the inside of the first light guiding part 8 It is comprised by the entrance plane which

  The plurality of reflection cuts 11 may be any as long as they reflect light L incident on the back surface 8 c of the first light guide 8 at an angle smaller than the critical angle with respect to the front surface 8 d of the first light guide 8 There is no particular limitation on the shape, size, number, etc.

  The second light guiding portion 9 is formed in a substantially plate shape as a whole as an inner lens, continuously on the front surface 8 d side of the first light guiding portion 8, in the longitudinal direction of the vehicle lamp 1 (X axis Direction) is extended in the width direction (Y-axis direction). In addition, the second light guide section 9 is outside (right side in the figure) than inside (left side in the figure) in the width direction (Y-axis direction) according to the slant shape given to the corner on the front end side of the vehicle Has a shape that is inclined toward the backward direction.

  The second light guide portion 9 causes the light L emitted from the front surface 8 d of the first light guide portion 8 to enter from the back surface (one surface) 9 a of the second light guide portion 9 to the inside. For this reason, the front surface 8 d of the first light guide 8 and the back surface 9 a of the second light guide 9 are disposed to face each other in parallel with the air layer K interposed therebetween.

  That is, in the light guide 3 of the present embodiment, the connecting portion 3 a connecting the first light guiding portion 8 and the second light guiding portion 9, the front surface 8 d of the first light guiding portion 8, and And a groove 3b for forming an air layer K between the light guide 9 and the back surface 9a of the light guide 9.

  The second light guide 9 directs the light L 1 reflected from the back 12 a of the second light guide 9 to the reflector 4, and the light L 1 reflected by the light reflector 12 to the reflector 4. And the step portion 14 that reflects part of the light L2 reflected by the reflection portion 12 and transmits the light L1 reflected by the reflector 4 and the light L2 reflected by the step portion 14 And an emitting portion 15 for emitting the light L1 transmitted through the step portion 14 to the outside.

  The reflective portion 12 is positioned on the front surface 9b of a portion of the second light guide portion 9 that is extended in the length direction (X-axis direction), and is inclined toward the transmissive portion 13 and the step portion 14 side. It is constituted by the reflecting surface.

  The transmitting portion 13 is located on the side surface 7c of a portion of the second light guide portion 9 that is extended in the length direction (X-axis direction), and part of the light L1 reflected by the reflecting portion 12 from the side surface 7c. Is constituted by a transparent surface that transmits light.

  The stepped portion 14 is located on the back surface 7 d of a portion of the second light guide portion 9 that is extended in the width direction (Y-axis direction), and transmits a portion of the light L 2 reflected by the reflecting portion 12 to the emitting portion 15. It has a plurality of inclined surfaces 14 a that are reflected toward the surface, and a plurality of step surfaces 14 b that are located between the plurality of inclined surfaces 14 a and transmit the light L 1 reflected by the reflector 4 toward the emission unit 15. ing.

  The emitting unit 15 is positioned on the front surface 9b of a portion of the second light guide 9 that is extended in the width direction (Y-axis direction), and emits a plurality of light beams L2 reflected by the plurality of inclined surfaces 14a. And a plurality of second light emitting regions 15b positioned between the plurality of first light emitting regions 15a and emitting light L1 transmitted through the plurality of stepped surfaces 14b. Configured.

  The reflector 4 has a diffuse reflection surface 4 a that reflects the light L <b> 1 transmitted through the transmission part 13 while diffusing the light L <b> 1 toward the step part 14 of the second light guide part 9. The reflector 4 (diffuse reflection surface 4 a) is located on the back side of the second light guide 9 and arranged along the inclination of the second light guide 9. In addition, the reflector 4 is disposed such that the outer side is located rearward relative to the inner side in the width direction of the diffuse reflection surface 4a. Further, in the present embodiment, the diffuse reflection surface 4a is formed as a continuous curved surface. Accordingly, it is possible to efficiently reflect the light L <b> 1 transmitted through the transmission portion 13 toward the inclined surface 14 b of the stepped portion 14.

  The diffuse reflection surface 4a is a concavo-convex shape for diffusing the light L1 reflected by the diffuse reflection surface 4a by embossing the metal reflection film such as Al provided on the surface facing the step portion 14 of the reflector 4 Is provided. Further, the diffuse reflection surface 4a is not necessarily limited to the above-described configuration formed by embossing, and for example, a plurality of reflection cuts for diffusing the light L1 reflected by the diffuse reflection surface 4a is provided. It is good also as composition.

  Furthermore, in the diffuse reflection surface 4a, in order to diffuse the light L1 reflected by the diffuse reflection surface 4a more uniformly, the diffuse reflection surface 4a is adjusted by adjusting the degree of emboss processing described above, the shape and interval of the reflection cut, etc. It is also possible to control the diffusion degree of the light L1 reflected by the reflecting surface 4a.

  The reflector 4 has a light shielding portion 16 which covers the periphery of the first light guiding portion 8. The light shielding portion 16 is provided so as to extend from a portion facing the step portion 14 of the reflector 4 to a position covering the periphery of the first light guiding portion 8. Thereby, it is possible to shield the leaked light from the periphery of the first light guide 8 by the light shield 16.

  Further, inside the lamp body 7, an extension 17 is provided which covers the front surface 9 b excluding the emitting portion 15 of the light guide 3. As a result, it is possible to block the leaked light from the front surface 9 b excluding the emitting portion 15 of the light guide 3 by the extension 17. In addition, it is possible to prevent the first light guide 8 from being reflected in the second light guide 9.

  In the vehicle lamp 1 of the present embodiment having the above configuration, of the lights L1 and L2 emitted from the emission portion 15 of the light guide 3, the light reflected by the plurality of inclined surfaces 14a (hereinafter referred to as reflection) Distinguish as light.) L2 is emitted from the plurality of first light emitting regions 15a. On the other hand, after being diffused and reflected by the diffuse reflection surface 4a of the reflector 4, light (hereinafter referred to as diffused light) L1 transmitted through the plurality of step surfaces 14b is emitted from the plurality of second light emitting regions 15b Ru.

  Here, the light emission pattern of the reflected light L2 and the diffused light L1 which are radiate | emitted from the radiation | emission part 15 of the light guide 3 is typically shown in FIG. Further, FIG. 5 shows a luminance distribution chart of the light emission pattern shown in FIG. In FIG. 5, the vertical axis represents luminance, and the horizontal axis represents the position of the emission unit 15 in the Y-axis direction. Further, in FIG. 5, the luminance distribution based on only the reflected light L2 is indicated by a "broken line", and the luminance distribution based on a combination of the reflected light L2 and the diffused light L1 is indicated by a "solid line". In addition, the luminance distribution by only the reflected light L2 is a luminance distribution when it is measured in a state where the reflector 4 is removed.

  In the vehicle lamp 1 of the present embodiment, as shown in FIG. 4 and FIG. 5, the light emission by the relatively strong reflected light L2 satisfying the light distribution standard as the position lamp and the diffused light L2 have different properties from each other. By alternately combining the light emission with the light L1, it is possible to produce a good-looking light emission with a three-dimensional effect.

  Further, among the light emission by the reflected light L2 and the light emission by the diffused light L1, when considering the luminance distribution by only the reflected light L2, as shown in FIG. 5, the difference between the maximum value and the minimum value of luminance (luminance difference Δd ) Is preferably in the range of 30 to 50%, where the maximum value of luminance is 100%.

  By adding the diffused light L1 from the reflector 4 to such a luminance distribution, the entire luminance distribution changes gently. Further, by providing such a luminance difference Δd in the luminance distribution by the reflected light L2, the reflected light L2 (first light emitting area 15a) and the diffused light L1 (second light emitting area 15b) which are emitted from the light guide 3 And can be easily distinguished. That is, in the first light emitting region 15a, the luminance of the diffused light L1 is relatively lower than the luminance of the reflected light L2. On the other hand, in the second light emitting region 115b, the luminance of the diffused light L1 is relatively larger than the luminance of the reflected light L2. Thereby, it is possible to produce a good-looking light emission with a three-dimensional effect.

In addition, this invention is not necessarily limited to the thing of the said embodiment, It is possible to add a various change in the range which does not deviate from the meaning of this invention.
That is, the vehicular lamp 1 of the present embodiment is not limited to the above-described configuration, and may have a configuration as shown in, for example, FIGS. 6 to 10 are cross-sectional views showing a modification of the vehicular lamp 1.

  Specifically, the light guide 3A shown in FIG. 6 emits a part of light (hereinafter referred to as transmitted light) L3 incident from the incident part 10 to the outside from a position different from that of the outgoing part 15 And the third light emitting region 15c that emits light by The third light emitting region 15 c is located outside the reflecting portion 12 on the front surface 9 b side of the second light guiding portion 9, and is configured by a plane parallel to the back surface 9 a of the second light guiding portion 9. It is done.

  On the other hand, the light guide 3B shown in FIG. 7 includes the third light emitting region 15c, and the arrangement of the connecting portion 3a with respect to the groove 3b is reversed. In addition, the third light emitting region 15 c is located between the reflecting portions 12 on the front surface 9 b side of the second light guiding portion 9 and configured by a plane parallel to the back surface 9 a of the second light guiding portion 9. It is done.

  On the other hand, 3 C of light guides shown in FIG. 8 are the structures which made the surface shape of the reflection part 12 the curved surface. As described above, by adjusting the surface shape of the reflecting portion 12, it is possible to adjust the orientation of the reflected light L 2 reflected by the reflecting surface 12.

  On the other hand, the light guide 3D shown in FIG. 9 has a configuration in which the first light guide 8 and the second light guide 9 are divided and combined. That is, although the light guide 3 has a configuration in which the first light guide 8 and the second light guide 9 described above are integrated, a part of the light guide 3 may be divided. .

  On the other hand, the reflector 4 shown in FIG. 10 has a configuration in which a stepped portion 18 is provided on the diffuse reflection surface 4a. The stepped portion 18 has a shape corresponding to the stepped portion 14 (the inclined surface 14 a and the stepped surface 14 b) of the light guide 3. Accordingly, it is possible to efficiently reflect the light L <b> 1 transmitted through the transmission portion 13 toward the inclined surface 14 b of the stepped portion 14.

  In addition, in the said vehicle lamp 1, according to the design etc. of an actual vehicle, it is possible to change the shape etc. of said light guides 3 and 3A-3D suitably. For example, in the light guides 3 and 3A to 3D, the number, the width, and the like of the inclined surfaces 14a and the stepped surfaces 14b in the stepped portion 14 can be appropriately changed.

  In the light guides 3 and 3A to 3D, in addition to the configuration in which the inclined surfaces 14a and the step surfaces 14b are alternately arranged in the width direction (Y-axis direction) of the second light guide, the second light guide The inclined surface 14a and the step surface 14b may be alternately arranged in the height direction (Z-axis direction) of the portion. Thereby, in the emitting portion 15, the first light emitting area 15a and the second light emitting area 15b can be alternately arranged in the width direction and the height direction (Z-axis direction) of the second light guiding portion It is.

  Further, the vehicle lamp to which the present invention is applied is not limited to the above-described vehicle lamp on the front side, and the present invention can be applied to a vehicle lamp on the rear side. Furthermore, the vehicle lamp to which the present invention is applied is not limited to the position lamp described above, and for example, a vehicle headlamp (head lamp), an auxiliary headlamp (sub headlamp), front (rear) fog For vehicle lamps equipped with light sources, light guides and reflectors such as lights (fog lamps), lamps for daytime lighting (DRL), lid lamps, brake lamps (stop lamps), back lamps, direction indicators (winker lamps) The present invention can be widely applied to the present invention.

  Further, as the light source 2, any light source may be used as long as it emits light L in a radial direction, and a light emitting element such as a laser diode (LD) can be used other than the above-described LED. Further, the color of light emitted from the light emitting element is not limited to the white light described above, and may be appropriately changed according to the application of the light source 2 such as red light or orange light.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lighting 2 ... Light source 3, 3A-3D ... Light guide 4 ... Reflector 4a ... Diffuse reflective surface 5 ... Housing 6 ... Lens cover 7 ... Light body 8 ... 1st light guide part 9 ... 2nd light guide Light portion 10: Incident portion 11: Reflective cut 12: Reflective portion 13: Transmission portion 14: Stepped portion 14a: Inclined surface 14b: Stepped surface 15: Outgoing portion 15a: First light emitting region 15b: Second light emitting region 15c: Third light emitting region 16: light shielding portion 17: extension 18: step portion L: light L1: diffused light L2: reflected light L3: transmitted light

Claims (7)

Light source,
A light guide for guiding light from the light source;
And a reflector provided on the back side of the light guide,
The light guide includes an incident portion through which light emitted from the light source is incident, a reflecting portion that reflects light incident from the incident portion, and part of light reflected by the reflecting portion. A transmitting portion transmitting toward the reflector, a step portion reflecting a part of the light reflected by the reflecting portion, and transmitting the light reflected by the reflector, the light reflected by the step portion and the light And an emitting portion for emitting light transmitted through the stepped portion to the outside,
The stepped portion is positioned between a plurality of inclined surfaces that reflect the light reflected by the reflection portion toward the emission portion, and the plurality of inclined surfaces, and the light reflected by the reflector is And a plurality of step surfaces which transmit toward the emission portion;
The emission unit is positioned between each of a plurality of first light emitting regions that emit light by light reflected by the plurality of inclined surfaces and each of the plurality of first light emitting regions, and transmits the plurality of step surfaces. And a plurality of second light emitting areas that emit light by the light.   The vehicle lamp according to claim 1, wherein the reflector includes a diffuse reflection surface that reflects the light transmitted through the transmission portion toward the step portion while diffusing the light. The light guide includes a first light guide including the incident portion, and a second light guide including the reflection portion, the transmission portion, the step portion, and the emission portion.
The first light guide portion injects the light emitted from the light source into the interior from the incident portion provided at one end of the first light guide portion, and the light guide portion is formed in the first light guide portion. The light is guided toward the other end of the first light guide while repeating the reflection, and the light reflected by the plurality of reflection cuts provided on one surface of the first light guide is the second light. The light is emitted from the other surface of the light guide 1 to the outside,
The second light guiding portion receives light emitted from the other surface of the first light guiding portion from one surface of the second light guiding portion to the inside, and guides the light toward the reflecting portion. The vehicle lamp according to claim 1 or 2, characterized in that:   The vehicular lamp according to claim 3, wherein the other surface of the first light guide portion and one surface of the second light guide portion are disposed to face each other with an air layer interposed therebetween. The second light guiding portion is inclined in a direction in which the outside recedes from the inside in the vehicle width direction with respect to the traveling direction of the light guided toward the emitting portion,
The vehicle lamp according to any one of claims 2 to 4, wherein the reflector is disposed along an inclination of the second light guide portion.   The vehicular lamp according to any one of claims 2 to 5, wherein the reflector includes a light shielding portion covering a periphery of the first light guiding portion.   The said light guide contains the 3rd light emission area | region which light-emits by radiate | emitting to one part the light which injected from the said entrance part from the position different from the said radiation | emission part outside. The vehicle lamp according to any one of 6.

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