JP2015167096A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve visibility of a light guide body when observed from a lighting fixture lateral side as well while sufficiently securing visibility of the light guide body when observed from the lighting fixture front side, in a vehicular lighting fixture configured in such a manner that light from a light source is made incident into the light guide body from an end surface of one end part side which goes around to the lighting fixture rear side.SOLUTION: A lighting fixture is configured in such a manner that light from a light source 30 entered from a right end surface 20a with respect to a light guide body 20 in which a right end part 20A goes around to a lighting fixture rear side is internally reflected by a plurality of first reflection elements 20s1, and it is emitted to the lighting fixture front side from a front surface part 20d. Thereby, irradiation light toward the lighting fixture front side is sufficiently secured. Then, in the right end part 20A, at least one second reflection element 20s2 is formed so as to be located between the first reflection elements 20s1. Then, the light from the light source 30 internally reflected at each second reflection element 20s2 is emitted toward the lighting fixture lateral side from the front surface part 20d. Thereby, irradiation light toward the lighting fixture lateral side is secured to some extent.

Description

  The present invention relates to a vehicular lamp provided with a light guide.

  Conventionally, in a vehicular lamp such as a tail lamp, a configuration including a light guide has been often adopted.

  In “Patent Document 1”, as a configuration of such a vehicular lamp, a light guide that is formed so as to extend in a required direction intersecting with the front-rear direction of the lamp and to have one end portion of the required direction wrap around the rear side of the lamp. The light guide is provided with a light source arranged so that light is incident from the end face on the one end side thereof.

  At that time, the light guide described in “Patent Document 1” is configured so that the light from the light source incident on the light guide is internally reflected by a plurality of reflecting elements formed on the rear surface thereof, and the front surface portion thereof. It is comprised so that it may radiate | emit to a lamp front.

JP 2012-174461 A

  Like the vehicular lamp described in the above-mentioned “Patent Document 1”, the light from the light source is incident on the light guide from the end face on one end thereof (that is, the portion that wraps around the lamp rear side). In this case, most of the emitted light from the light guide is directed toward the front of the lamp, so that almost no light toward the side of the lamp can be obtained. For this reason, the visibility of the light guide when viewed from the front of the lamp is sufficiently ensured, but the visibility of the light guide when viewed from the side of the lamp is significantly reduced. is there.

  The present invention has been made in view of such circumstances, and is a vehicular lamp configured to cause light from a light source to enter a light guide body from an end face on one end side that wraps around the lamp rear side. Provides a vehicular lamp capable of improving the visibility of the light guide when observed from the side of the lamp, while ensuring sufficient visibility of the light guide when viewed from the front of the lamp. It is intended to do.

  In the present invention, the object is achieved by devising the configuration of the one end portion of the rear surface portion of the light guide.

That is, the vehicular lamp according to the present invention is
A light guide that extends in a required direction intersecting with the front-rear direction of the lamp and has one end in the required direction wrapping around the rear side of the lamp, and the one end side of the light guide with respect to the one end side of the light guide In a vehicle lamp comprising: a light source disposed so that light is incident from an end surface;
The light guide body internally reflects the light from the light source incident on the light guide body by a plurality of first reflecting elements formed on the rear surface section of the light guide body, thereby front parts of the light guide body. Is configured to emit light forward from the lamp.
The plurality of first reflective elements are formed at intervals from each other in the required direction at least at the end portion.
At least one second reflective element is formed in the portion of the one end portion of the rear surface portion of the light guide so as to be positioned between the first reflective elements,
By each said 2nd reflective element, the light from the said light source which injected into the said light guide is reflected internally, and from the front part of this light guide is the end surface of the said one end part side with respect to this 2nd reflective element. The light is reflected by the first reflecting element adjacent to the opposite side and is emitted toward the lamp side rather than the light emitted from the front surface portion.

  The “front-and-rear direction of the lamp” means a direction connecting the lamp and a position where the lighting state of the lamp can be observed from the outside, and the specific direction is not particularly limited.

  The specific direction is not particularly limited as long as the “required direction” is a direction intersecting the lamp front-rear direction.

  The type of the “light source” is not particularly limited as long as it is arranged so that light from the light source is incident on the light guide from an end surface on one end side thereof. May be configured to directly enter the light guide, or may be configured to enter the light guide via a lens, a reflector, or the like.

  The “plurality of first reflective elements” are formed at a distance from each other in a required direction in at least one end portion of the rear surface portion of the light guide. The specific size of is not particularly limited.

  The “at least one second reflecting element” is formed at one end portion of the rear surface portion of the light guide, but may be formed at all locations between the first reflecting elements. However, it may be formed only at a part of the portion.

  As shown in the above configuration, the vehicular lamp according to the present invention causes light to be incident from an end surface on one end side with respect to a light guide formed so that one end portion in a required direction wraps around the rear side of the lamp. The light source is disposed on the light guide body, and the plurality of first reflection elements formed on the rear surface portion of the light guide body reflect the light from the light source incident on the light guide body to be emitted from the front face portion to the front of the lamp. Since it becomes the structure to make it irradiate, the irradiation light ahead of a lamp can fully be ensured. Therefore, the visibility of the light guide when observed from the front of the lamp can be sufficiently ensured.

  In addition, in the vehicular lamp according to the invention of the present application, a plurality of first reflecting elements are provided in at least one end portion of the rear surface portion of the light guide (that is, a portion formed to wrap around the lamp rear side). At least one second reflecting element is formed so as to be positioned between the first reflecting elements at a portion of the one end portion in the required direction. The light reflected from the light source incident on the light guide by the second reflecting element is internally reflected, and the first reflecting element adjacent to the second reflecting element on the side opposite to the end face on the one end side from the front face portion. Since the light is reflected and emitted toward the lamp side rather than the light emitted from the front surface portion, the irradiation light to the lamp side can be secured to some extent. Therefore, the visibility of the light guide when observed from the side of the lamp can also be improved.

  As described above, according to the present invention, in the vehicular lamp configured to make the light from the light source enter the light guide from the end surface on the one end part side that wraps around the lamp rear side, when observed from the front of the lamp The visibility of the light guide when observed from the side of the lamp can be improved while sufficiently ensuring the visibility of the light guide.

  In the above configuration, if each first reflective element and each second reflective element are formed so as to protrude from the rear surface portion of the light guide, the light guide efficiency for light from the light source incident on the light guide is increased. Can be increased.

  In the above configuration, a plurality of second reflective elements are provided, and the projecting height from the rear surface portion of the plurality of second reflective elements is such that the second reflective element is located farther from the end surface on one end side. If the light guide is observed to be moved from the front of the lamp to the side of the lamp, the brightness of the light guide changes suddenly. Can be prevented.

  In the above configuration, if the light is emitted from the front surface portion of the light guide after being internally reflected by each second reflecting element, the light component is directed to a direction inclined by 80 ° or more from the lamp front-rear direction. The visibility of the light guide when observed from above can be improved over a wide angle range.

  In the above configuration, if the first reflective element and the second reflective element are alternately arranged in the required direction after having a configuration including a plurality of second reflective elements, either the front of the lamp or the side of the lamp is provided. Even when observed from the direction, the light guide can appear to emit light uniformly.

Plan sectional drawing which shows the vehicle lamp which concerns on one Embodiment of this invention Detailed view of part II in Fig. 1 Detailed view of part III in Fig. 2 The same figure as FIG. 3 which shows the 1st modification of the said embodiment. The same figure as FIG. 3 which shows the 2nd modification of the said embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan sectional view showing a vehicular lamp 10 according to an embodiment of the present invention. FIG. 2 is a detailed view of part II in FIG.

  As shown in these drawings, a vehicular lamp 10 according to the present embodiment is a tail lamp provided at a right rear end portion of a vehicle, and a lamp body 12 and a through hole attached to a front end opening portion of the lamp body 12 are illustrated. The light guide 20 is disposed in the lamp chamber formed by the light-transmitting cover 14 so as to extend in the vehicle width direction, and from the right end surface 20a outside the vehicle width direction with respect to the light guide 20. The light source 30 is arranged so that light is incident thereon.

  As for the vehicular lamp 10, in FIG. 1, the direction indicated by X is “front” (“rear” for vehicles), and the direction indicated by Y is “right direction” orthogonal to “front”.

  The light guide 20 is a transparent synthetic resin molded article made of acrylic resin or the like, and is rearward from the left end surface 20b on the inner side in the vehicle width direction to the right end surface 20a on the outer side in the vehicle width direction (that is, on the front side of the vehicle). ) Is formed as a light guide column formed so as to go around.

  In the following description, the direction in which the light guide body 20 curves and extends in the vehicle width direction is referred to as a “required direction”.

  The light source 30 is a red light emitting diode, and is disposed in the vicinity of the right end surface 20a of the light guide 20 so that the light emitting surface 30a faces the right end surface 20a. The light source 30 is supported by a light source support member 32. The light source support member 32 is supported by the lamp body 12.

  The light guide 20 is supported by light guide support members 22 and 24 at both left and right ends thereof. At this time, the light guide support member 22 that supports the light guide 20 on the right end surface 20a is supported by the light source support member 32, and the light guide support member 24 that supports the left end surface 20b includes The lamp body 12 is supported.

  A plurality of first reflective elements 20s1 are formed on the rear surface portion 20c of the light guide 20 in regions other than the region near the right end surface 20a and the region near the left end surface 20b. The plurality of first reflection elements 20s1 reflect the light from the light source 30 incident on the light guide 20 to the inner surface by total reflection and emit the light from the front surface portion 20d to the front of the lamp.

  The plurality of first reflective elements 20s1 are formed at intervals in the required direction. At this time, each of the first reflecting elements 20s1 is formed so as to protrude rearward from the rear surface portion 20c.

  Each of the first reflecting elements 20s1 has a wedge-shaped horizontal cross-sectional shape, and is formed such that the horizontal cross-sectional shape becomes larger as it is located farther from the right end surface 20a. For this reason, the interval between the first reflective elements 20s1 is relatively wide at the right end portion (that is, the portion near the right end surface 20a) 20A of the light guide 20, and gradually decreases as it approaches the left end surface 20b.

  A plurality of second reflective elements 20s2 are formed in the portion located at the right end 20A in the rear surface portion 20c of the light guide 20 so as to be positioned between the first reflective elements 20s1. At this time, each of the second reflective elements 20s2 is arranged alternately with the first reflective elements 20s1 in the required direction.

  Each of these second reflective elements 20s2 is formed so as to protrude rearward from the rear surface portion 20c. Each of these second reflective elements 20s2 has a wedge-shaped horizontal cross-sectional shape. At this time, each of the second reflective elements 20s2 has a constant width in the required direction, but is formed such that the protrusion height from the rear surface portion 20c decreases as the distance from the right end surface 20a increases. .

  In FIG. 2, the position of the rear surface portion 20 c when the second reflecting elements 20 s 2 are not formed is indicated by a two-dot chain line.

  FIG. 3 is a detailed view of part III in FIG.

  In FIG. 3, the slope on the right end face 20a side of each first reflecting element 20s1 is the first face 20s1a, the slope on the left end face 20b side is the second face 20s1b, and the right end face 20a side of each second reflecting element 20s2 This slope is referred to as a third surface 20s2a, and the slope on the left end face 20b side is referred to as a fourth surface 20s2b.

  The rising angle θ2 from the rear surface portion 20c of the fourth surface 20s2b of each second reflecting element 20s2 is set to a value larger than the rising angle θ1 of the second surface 20s1b of the first reflecting element 20s1 adjacent to the left end surface 20b side. Has been.

  Thereby, most of the light from the light source 30 that has entered the light guide 20 and reached each second reflective element 20s2 is emitted from the second reflective element 20s2 to the back side of the light guide 20. The rest of the light is internally reflected by the second reflecting element 20s2 and emitted from the front surface portion 20d toward the lamp side (that is, outside in the vehicle width direction) at a considerably large inclination angle with respect to the X direction. That is, the light reflected from the inner surface of each second reflecting element 20s2 and emitted from the front face portion 20d is more on the lamp side than the light reflected from the first reflecting element 20s1 adjacent to the left end face 20b side and emitted from the front face portion 20d. It will be emitted toward the direction.

  At that time, each of the second reflective elements 20s2 includes a light component directed to a direction inclined by 80 ° or more from the X direction as light emitted from the front surface part 20d after being internally reflected by the second reflective element 20s2. A value of the rising angle θ2 of the fourth surface 20s2b is set.

  Next, the function and effect of this embodiment will be described.

  The vehicular lamp 10 according to the present embodiment has a light guide 20 formed so that a right end portion 20A, which is one end portion in a required direction (that is, a direction curved in the vehicle width direction), wraps around the lamp rear side. A light source 30 is arranged so that light is incident from the right end surface 20a, and the light source 30 incident on the light guide 20 by the plurality of first reflecting elements 20s1 formed on the rear surface portion 20c of the light guide 20 is provided. Is reflected on the inner surface and emitted from the front surface portion 20d to the front of the lamp, so that sufficient irradiation light to the front of the lamp can be secured. Therefore, the visibility of the light guide 20 when observed from the front of the lamp can be sufficiently ensured.

  In addition, in the vehicular lamp 10 according to the present embodiment, a plurality of first reflecting elements 20s1 are formed at intervals in the required direction, and at the right end portion 20A, between the first reflecting elements 20s1. A plurality of second reflective elements 20s2 are formed so as to be located at the inner surface, and the light from the light source 30 incident on the light guide 20 by each of the second reflective elements 20s2 is reflected on the inner surface from the front surface portion 20d. Since the light is reflected by the first reflecting element 20s1 adjacent to the left end surface 20b and is emitted toward the lamp side rather than the light emitted from the front surface part 20d, the irradiation light to the lamp side is also secured to some extent. can do. Therefore, the visibility of the light guide 20 when observed from the side of the lamp can also be improved.

  As described above, according to the present embodiment, in the vehicular lamp 10 configured to make the light from the light source 30 incident on the light guide 20 from the end face on the one end side that wraps around the lamp rear side, from the front of the lamp. The visibility of the light guide 20 when observed from the side of the lamp can be improved after sufficiently ensuring the visibility of the light guide 20 when observed.

  At this time, in the present embodiment, each of the first reflecting elements 20s1 and each of the second reflecting elements 20s2 is formed so as to protrude from the rear surface portion 20c of the light guide 20, so that the light source incident on the light guide 20 The light guide efficiency for light from 30 can be increased.

  In addition, in the present embodiment, the plurality of second reflecting elements 20s2 are formed such that the protrusion height from the rear surface portion 20c is lower as the distance from the right end surface 20a is lower. It is possible to prevent the brightness of the light guide 20 from changing suddenly when the position for observing the light is moved from the front of the lamp to the side of the lamp.

  Further, in the present embodiment, the light reflected from the inner surface of each second reflecting element 20s2 and emitted from the front surface portion 20d of the light guide 20 includes a light component that travels in a direction inclined at least 80 ° from the front-rear direction of the lamp. Therefore, the visibility of the light guide 20 when observed from the side of the lamp can be improved over a wide angle range.

  Furthermore, in the present embodiment, since the first reflecting element 20s1 and the second reflecting element 20s2 are alternately arranged one by one in the required direction, the light is guided even when observed from either the front side or the side of the lamp. It is possible to make the light body 20 appear to emit light uniformly.

  In the above embodiment, each first reflective element 20s1 and each second reflective element 20s2 has been described as projecting from the rear surface portion 20c of the light guide 20, but is recessed from the rear surface portion 20c. It is also possible to adopt a configuration formed in the above.

  In the above-described embodiment, the light guide 20 is described as being disposed so as to extend in the vehicle width direction. However, a configuration in which the light guide 20 is disposed so as to extend in the vertical direction or in an oblique direction is also possible.

  In the above-described embodiment, the light emitting diode is used as the light source 30, but a configuration using other types of light sources is also possible.

  In the above embodiment, the case where the vehicular lamp 10 is a tail lamp provided at the right rear end of the vehicle has been described. However, the same configuration as that of the above embodiment is adopted regardless of the location and function provided in the vehicle. By doing so, it is possible to obtain the same effect as the above-described embodiment.

  Next, a modification of the above embodiment will be described.

  First, a first modification of the above embodiment will be described.

  FIG. 4 is a view similar to FIG. 3 and showing a relevant part of the vehicular lamp according to the present modification.

  As shown in the figure, in the present modification, the configuration of the light guide 120 is different from the light guide 20 of the above embodiment.

  That is, the light guide 120 of this modification also has a configuration in which a plurality of first reflection elements 120s1 and a plurality of second reflection elements 120s2 are formed on the rear surface portion 120c at the right end portion 120A. This is different from the above-described embodiment in that two second reflective elements 120s2 are respectively disposed between the reflective elements 120s1. At that time, these two second reflecting elements 120s2 are arranged in a required direction with a horizontal cross-sectional shape obtained by reducing each second reflecting element 20s2 of the above embodiment in a similar shape. The arrangement of the first reflective elements 120s1 and the horizontal cross-sectional shape of each of the first reflective elements 120s1 are the same as in the above embodiment.

  Even in the case of adopting the configuration of this modification, it is possible to secure a certain amount of irradiation light to the side of the lamp by the light reflected by each second reflecting element 120s2 and emitted from the front surface portion 120d. And thereby, the same effect as the case of the said embodiment can be acquired.

  Moreover, when the structure of this modification is employ | adopted, the protrusion amount from the rear surface part 120c of each 2nd reflective element 120s2 can be made small.

  Next, a second modification of the above embodiment will be described.

  FIG. 5 is a view similar to FIG. 3 and showing a relevant part of the vehicular lamp according to this modification.

  As shown in the figure, in this modification, the configuration of the light guide 220 is different from that of the light guide 20 of the above embodiment.

  That is, the light guide 220 of this modification also has a configuration in which a plurality of first reflection elements 220s1 and a plurality of second reflection elements 220s2 are formed on the rear surface portion 220c at the right end portion 220A. This is different from the above-described embodiment in that the reflective elements 220s1 are formed not at all the locations between the reflective elements 220s1 but only at some locations (specifically, every other location). In that case, each 2nd reflective element 220s2 is formed in the horizontal cross-sectional shape same as each 2nd reflective element 20s2 of the said embodiment. On the other hand, the arrangement of the plurality of first reflective elements 220s1 and the horizontal cross-sectional shape of each of them are the same as in the above embodiment.

  Even in the case of adopting the configuration of the present modification, it is possible to secure a certain amount of irradiation light to the side of the lamp by the light reflected by each second reflecting element 220s2 and emitted from the front surface portion 220d. And thereby, the same effect as the case of the said embodiment can be acquired.

  When the configuration of this modification is adopted, the amount of light irradiated to the side of the lamp by the light reflected from each second reflecting element 220s2 and emitted from the front surface portion 220d is smaller than that in the above-described embodiment. It is possible to increase the proportion of the light that is guided by being internally reflected by the rear surface portion 220c of the light body 220.

  In addition, the numerical value shown as a specification in the said embodiment and its modification is only an example, and of course, you may set these to a different value suitably.

  The invention of the present application is not limited to the configuration described in the above-described embodiment and its modifications, and a configuration with various other changes can be adopted.

DESCRIPTION OF SYMBOLS 10 Vehicle lamp 12 Lamp body 14 Translucent cover 20, 120, 220 Light guide 20A, 120A, 220A Right end part (one end part)
20a Right end surface (end surface on one end side)
20b Left end surface 20c, 120c, 220c Rear surface portion 20d, 120d, 220d, front surface portion 20s1, 120s1, 220s1 first reflective element 20s1a first surface 20s1b second surface 20s2, 120s2, 220s2 second reflective element 20s2a third surface 20s2b second Four surfaces 22, 24 Light guide support member 30 Light source 30a Light emission surface 32 Light source support member

Claims (5)

A light guide that extends in a required direction intersecting with the front-rear direction of the lamp and has one end in the required direction wrapping around the rear side of the lamp, and the one end side of the light guide with respect to the one end side of the light guide In a vehicle lamp comprising: a light source disposed so that light is incident from an end surface;
The light guide body internally reflects the light from the light source incident on the light guide body by a plurality of first reflecting elements formed on the rear surface section of the light guide body, thereby front parts of the light guide body. Is configured to emit light forward from the lamp.
The plurality of first reflective elements are formed at intervals from each other in the required direction at least at the end portion.
At least one second reflective element is formed in the portion of the one end portion of the rear surface portion of the light guide so as to be positioned between the first reflective elements,
By each said 2nd reflective element, the light from the said light source which injected into the said light guide is reflected internally, and from the front part of this light guide is the end surface of the said one end part side with respect to this 2nd reflective element. A vehicular lamp, characterized in that the vehicular lamp is configured to be emitted toward the lamp side rather than the light reflected from the first reflecting element adjacent to the opposite side and emitted from the front surface portion.   2. The vehicular lamp according to claim 1, wherein each of the first reflecting elements and each of the second reflecting elements is formed so as to protrude from a rear surface portion of the light guide body. A plurality of the second reflective elements;
The plurality of second reflecting elements are formed such that the second reflecting element located at a position away from the end face on the one end side has a lower protrusion height from the rear face part. Item 3. A vehicle lamp according to item 1 or 2.   The light component that is internally reflected by each of the second reflecting elements and is emitted from the front surface of the light guide includes a light component that travels in a direction inclined at least 80 ° from the front-rear direction of the lamp. 1-3. The vehicle lamp in any one of 1-3. A plurality of the second reflective elements;
The vehicular lamp according to any one of claims 1 to 4, wherein the first reflecting element and the second reflecting element are alternately arranged in the required direction.

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