JP2019050132A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp for a vehicle capable of more uniform light emission while improving the efficiency of light utilization. SOLUTION: The light guide body 3 includes a light source and a light guide body 3 for guiding light L from the light source, and the light guide body 3 includes an incident portion in which light L emitted from the light source is incident on the inside. The light guide unit 7, the first reflecting surface 10 that reflects the light L incident from the incident portion, the second reflecting surface 11 that reflects the light L reflected by the first reflecting surface 10, and the second. The second light guide unit 8 includes a second light guide unit 8 including an emission surface 12 that emits the light L reflected by the reflection surface 11 to the outside, and the second light guide unit 8 has a first reflection surface 10 and a second light guide unit 8. The light diffusing portion 13 for diffusing at least a part of the light L incident on any of the reflecting surface 11 and the emitting surface 12 of 2 is included. [Selection diagram] Fig. 2

Description

  The present invention relates to a vehicular lamp.

  Conventionally, as a vehicular lamp mounted on a vehicle, a light source such as a light emitting diode (LED) and light emitted from the light source are incident on the inside from an incident surface on one end side and repeatedly reflected inside. A combination of a light guide that guides light toward the emission surface on the end side is known (see, for example, Patent Document 1 below).

  On the other hand, the LED has a characteristic that light is difficult to diffuse while it has a high directivity (straightness). For this reason, in the vehicular lamp, a so-called luminance (light emission) unevenness in which the portion corresponding to the light emitting point of the LED on the light emitting surface (light emitting surface) of the light guide shines stronger than the other portions is likely to occur.

  Therefore, in the vehicular lamp described in Patent Document 1 below, light emitted from the emission surface is diffused by applying a texture to the light guide. However, when embossing is applied to the light guide, a part of the light is lost from this portion, so that there is a problem that the utilization efficiency of the light guided inside the light guide is reduced. . As a result, it may be difficult to guide light incident from one end of the light guide to the other end of the light guide.

JP2013-191212A

  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 enables more uniform light emission while improving the light use efficiency.

In order to achieve the above object, the present invention provides the following means.
[1] a light source;
A light guide for guiding light from the light source,
The light guide includes a first light guide including an incident part into which light emitted from the light source is incident, a first reflecting surface that reflects light incident from the incident part, and the first A second light guide unit including a second reflection surface that reflects the light reflected by the first reflection surface and an emission surface that emits the light reflected by the second reflection surface to the outside; ,
The second light guide unit is a light diffusion unit that diffuses at least a part of light incident on any one of the first reflection surface, the second reflection surface, and the emission surface. A vehicular lamp characterized by comprising:
[2] The first light guide unit causes the light emitted from the light source to enter the inside from the incident unit provided on one end side of the first light guide unit, and the first light guide unit. The light is guided toward the other end of the first light guide unit while being repeatedly reflected inside the unit, and is reflected by a plurality of reflection cuts provided on one surface of the first light guide unit. Emitted light from the other surface of the first light guide unit to the outside,
The second light guide unit allows light emitted from the other surface of the first light guide unit to enter from one surface of the second light guide unit to the inside, and is directed toward the first reflection surface. The vehicular lamp as set forth in [1], wherein the light is guided.
[3] The vehicle according to [2], wherein the other surface of the first light guide portion and the one surface of the second light guide portion are arranged to face each other with an air layer interposed therebetween. Lamps.
[4] An inner lens into which the light emitted from the emission surface enters,
The vehicular lamp according to any one of [1] to [3], wherein the inner lens includes a light diffusion portion that diffuses at least part of light incident on the inner lens.

  As described above, according to the present invention, it is possible to provide a vehicular lamp that can emit light more uniformly while improving the light use efficiency.

It is a front view which shows schematic structure of the vehicle lamp which concerns on one Embodiment of this invention. It is sectional drawing of the vehicle lamp by line segment AA 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 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 and 2 will be described.
FIG. 1 is a front view showing a schematic configuration of the vehicular lamp 1. FIG. 2 is a sectional view of the vehicular lamp 1 taken along line AA shown in FIG.

  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 includes, for example, a vehicular headlamp (headlamp) mounted at both corner portions on the front end side of the vehicle (not shown) (the corner portion on the left front end side in this embodiment). ) To which the present invention is applied.

  Specifically, as shown in FIGS. 1 and 2, the vehicular lamp 1 includes a low beam (passing beam) lamp LL, a high beam (traveling beam) lamp HL, and a clearance lamp inside the lamp body H. (Vehicle width lamp) CL and CL are integrated to form a combination headlamp.

  Among these, the clearance lamp CL includes a light source 2 and a light guide 3 that guides light L from the light source 2. The clearance lamp CL has a light source 2 and a light guide 3 arranged in a lamp chamber 6 constituted by a housing 4 whose front surface is open and a transparent inner lens cover 5 covering the opening of the housing 4. It becomes the composition.

  The light source 2 includes, for example, a chip LED (SMD LED) that emits white light. Moreover, the high power (high brightness) type thing for vehicle illumination is used for chip LED. The light source 2 emits light L radially toward the light guide 3.

  The light guide 3 includes a first light guide portion 7 serving as a light guide pipe and a second light guide portion 8 serving as an inner lens. The light guide 3 has a configuration in which the first light guide 7 and the second light guide 8 are integrated. 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.

  The first light guide portion 7 is formed in a substantially rod shape as a whole as a light guide pipe, and is extended in the width direction (Y-axis direction) of the vehicular lamp 1. The first light guide unit 7 enters the light L emitted from the light source 2 from the incident unit 9 provided on the one end 7a side of the first light guide unit 7 and enters the first light guide unit 7. The light L is guided toward the other end 7b side of the first light guide unit 7 while being repeatedly reflected inside the unit 7, and provided on the back surface (one surface) 7c of the first light guide unit 7. The light L reflected by the plurality of reflection cuts (not shown) is emitted from the front surface (other surface) 7d of the first light guide 7 to the outside.

  The front surface 7d of the first light guide 7 is formed as a smooth flat surface. Moreover, the surface except the back surface 3c and the front surface 7d of the 1st light guide part 7 is formed as a smooth curved surface. The back surface 7a and the front surface 7d of the first light guide 7 are formed as surfaces extending along the extending direction of the light guide pipe.

  The incident portion 9 is located on the one end 7 a side of the first light guide portion 7, and the light L from the light source 2 disposed to face the incident portion 9 enters the first light guide portion 7. An incident surface for incidence is formed.

  The plurality of reflection cuts only need to reflect the light L incident on the back surface 7c of the first light guide unit 7 with respect to the front surface 7d of the first light guide unit 7 at an angle that is less than the critical angle. The shape, size, number, etc. are not particularly limited.

  The 2nd light guide part 8 is formed in the substantially plate shape as an inner lens as a whole, and is extended and provided in the width direction (Y-axis direction) of the vehicle lamp 1. As shown in FIG. The second light guide 8 has a shape extended along the extension direction of the first light guide 7. The second light guide 8 enters the light L emitted from the front surface 7d of the first light guide 7 from the back (one surface) 8a of the second light guide 8 into the inside. For this reason, the front surface 7d of the first light guide unit 7 and the back surface 8a of the second light guide unit 8 are arranged to face each other in parallel with the air layer K in between.

  That is, the light guide 3 of the present embodiment includes a connecting portion 3 a that connects the first light guide portion 7 and the second light guide portion 8, a front surface 7 d of the first light guide portion 7, and the first light guide portion 7. A groove portion 3b for forming an air layer K is formed between the second light guide portion 8 and the back surface 8a.

  The second light guide 8 is reflected by the first reflective surface 10 that reflects the light L incident from the back surface 8 a of the second light guide 8 downward and the first reflective surface 10. The second reflecting surface 11 that reflects the light L toward the front and the light L reflected by the second reflecting surface 11 from the front surface (other surface) 8b of the second light guide 8 to the outside. And the exit surface 12 for exiting.

  The second light guide unit 8 diffuses at least a part of the light L incident on any one of the first reflecting surface 10, the second reflecting surface 11, and the emitting surface 12. The diffusion unit 13 is provided. Specifically, in the present embodiment, the light diffusing unit 13 is provided on the emission surface 12.

  The light diffusing unit 13 has a configuration in which a concave and convex shape that diffuses the light L emitted from the emission surface 12 is provided by applying a texture to the emission surface 12. In addition, the light diffusing unit 13 is not necessarily limited to the structure formed by the above-described embossing. For example, the light diffusing unit 13 includes a plurality of reflection cuts for diffusing the light L emitted from the emission surface 12. Also good.

  Further, the light diffusing portion 13 may have a configuration in which an uneven shape for diffusing the light L emitted from the emission surface 12 is provided by performing knurling on the emission surface 12. Furthermore, the light diffusing unit 13 may have a configuration in which a lens cut that diffuses light L called fish-eye cut in the vertical direction and the horizontal direction is given to the emission surface 12.

  In the light diffusing unit 13, in order to make the emission surface 12 emit light more uniformly, the degree of embossing applied to the emission surface 12, the shape and interval of reflection cuts and knurls formed on the emission surface 12 are adjusted. Accordingly, the degree of diffusion of the light L emitted from the emission surface 12 can be controlled.

  For example, at a position relatively close to the incident portion 9, the degree of diffusion by the light diffusing portion 13 is relatively high, and at a position relatively far from the incident portion 9, the degree of diffusion by the light diffusing portion 13 is relatively high. It is possible to make it low or to omit the light diffusion part 13.

  In the vehicular lamp 1 having the above-described configuration, the clearance lamp CL emits light by the light L emitted from the emission surface 12 to the outside of the second light guide 8 (the light guide 3). It is possible to emit light (surface light emission) substantially uniformly on the surface (outgoing surface 12).

  In the vehicular lamp 1 according to this embodiment, the light guide 3 described above is divided into a first light guide 7 and a second light guide 8, and the light diffusing unit 13 is provided on the second light guide 8 side. As a result, a part of the light L is excessively extracted from a part of the first light guide 7, and the utilization efficiency of the light L guided inside the light guide 3 is reduced. It is possible to sufficiently guide the light L to the other end of the light guide 3. Thereby, more uniform light emission with less luminance (light emission) unevenness is possible on the light emission surface (emission surface 12) of the clearance lamp CL.

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 vehicle lamp 1 has a configuration in which the light diffusing portion 13 is provided on the emission surface 12 described above. For example, as illustrated in FIG. 3, the light diffusing portion 13 is provided on the first reflecting surface 10. Alternatively, as shown in FIG. 4, a configuration in which the light diffusing portion 13 is provided on the second reflecting surface 11 may be employed.

  In the vehicular lamp 1, for example, as shown in FIG. 5, in the inner lens cover 5 on which the light L emitted from the emission surface 12 of the second light guide 8 (light guide 3) enters, this A light diffusing portion 14 that diffuses at least a part of the light L incident on the inner lens cover 5 may be provided.

  As the light diffusing unit 14, the same configuration as that of the light diffusing unit 13 can be adopted. Further, the inner lens cover 5 may be configured to contain a light diffusing material or the like. The inner lens cover 5 functions as a lens cover that covers the opening of the housing 4 and an inner lens that guides the light L emitted from the emission surface 12 of the second light guide 8 (light guide 3). It has the function of.

  Moreover, in the said vehicle lamp 1, the light L reflected by the 1st reflective surface 10 or the 2nd reflective surface 11 is adjusted by adjusting the surface shape of the 1st reflective surface 10 or the 2nd reflective surface 11. FIG. The orientation may be adjusted.

  Moreover, in the said vehicle lamp 1, as the said light-diffusion part 13, not only the above-mentioned uniform light emission but the light emission surface of the clearance lamp CL by giving a partial embossing process, a fish-eye cut, etc. to the output surface 12 It is also possible to partially vary the light emission.

  In the vehicle lamp 1, the shape of the light guide 3 and the like can be changed as appropriate in accordance with the actual vehicle design and the like. Moreover, although the said light guide 3 becomes the structure which integrated the 1st light guide part 7 and the 2nd light guide part 8 which were mentioned above, it is good also as a structure which divided | segmented some of them. . For example, the light guide 3 can be formed by combining the first light guide portion 7 and the second light guide portion 8 together.

  In the above embodiment, the case where the present invention is applied to the above-described combination headlamp is illustrated. However, when the combination headlamp is configured, in addition to the above-described configuration, for example, an outer lens, a reflector, an extension, and the like. It can be combined with other members.

  The vehicle lamp to which the present invention is applied is not limited to the above-described front-side vehicle lamp, and the present invention can be applied to a rear-side vehicle lamp such as a rear combination lamp, for example.

  Furthermore, the vehicular lamp to which the present invention is applied is not limited to the clearance lamp CL described above, and for example, a vehicular headlamp (head lamp), an auxiliary headlamp (sub headlamp), and a front portion (rear portion). For vehicle lamps equipped with light sources and light guides such as fog lights (fog lamps), daytime lighting lamps (DRL), lid lamps, brake lamps (stop lamps), back lamps, turn indicators (winker lamps) Thus, the present invention can be widely applied.

  The light source 2 may be any light source that emits the light L radially. For example, a light emitting element such as a laser diode (LD) can be used in addition to the LED described above. In addition, the color of light emitted from the light emitting element is not limited to the above-described white light, and may be appropriately changed according to the use of the light source 2 such as red light or orange light.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Light source 3 ... Light guide 4 ... Housing 5 ... Inner lens cover 6 ... Lamp chamber 7 ... 1st light guide part 8 ... 2nd light guide part 9 ... Incident part 10 ... 1st Reflective surface 11 ... Second reflective surface 12 ... Outgoing surface 13, 14 ... Light diffuser K ... Air layer LL ... Low beam lamp HL ... High beam lamp CL ... Clearance lamp H ... Lamp

Claims (4)

A light source;
A light guide for guiding light from the light source,
The light guide includes a first light guide including an incident part into which light emitted from the light source is incident, a first reflecting surface that reflects light incident from the incident part, and the first A second light guide unit including a second reflection surface that reflects the light reflected by the first reflection surface and an emission surface that emits the light reflected by the second reflection surface to the outside; ,
The second light guide unit is a light diffusion unit that diffuses at least a part of light incident on any one of the first reflection surface, the second reflection surface, and the emission surface. A vehicular lamp characterized by comprising: The first light guide unit enters light emitted from the light source from the incident unit provided on one end side of the first light guide unit, and enters the inside of the first light guide unit. While repeating the reflection, the light is guided toward the other end of the first light guide unit, and the light reflected by the plurality of reflection cuts provided on one surface of the first light guide unit is reflected. Emitted from the other surface of the first light guide to the outside,
The second light guide unit allows light emitted from the other surface of the first light guide unit to enter from one surface of the second light guide unit to the inside, and is directed toward the first reflection surface. The vehicle lamp according to claim 1, wherein light is guided.   The vehicular lamp according to claim 2, wherein the other surface of the first light guide portion and the one surface of the second light guide portion are arranged to face each other with an air layer interposed therebetween. An inner lens on which light emitted from the emission surface is incident;
The vehicular lamp according to any one of claims 1 to 3, wherein the inner lens includes a light diffusion portion that diffuses at least part of light incident on the inner lens.

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