JP2015082443A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture for suppressing the occurrence of light irregularity by uniformly emitting light from a whole light guide.SOLUTION: The vehicular lighting fixture includes: a first light guide 9 which extends in a predetermined direction, and which has longitudinal one end face formed as an entrance surface 12 through which light emitted from a light source 16 enters and part of a peripheral face 13 formed as an emission surface 13b to emit the light guided inside; and a second light guide 10 which extends in a predetermined direction, at least part of which is arranged along the first light guide, and which has longitudinal one end face formed as a light source light entrance surface 14 through which light emitted from a light source 17 enters and parts of a peripheral face 15 formed as light inlet surface 15a and a light outlet surface 15b, respectively. At least part of the light entering from the entrance surface into the first light guide and guided inside is emitted from the emission surface and enters from the light inlet surface into the second light guide, and the light entering from the light inlet surface into the second light guide and the light entering from the light source light entrance surface into the second light guide and guided inside are emitted from the light outlet surface.

Description

  The present invention relates to a technical field relating to a vehicular lamp having a light guide that guides light emitted from a light source in a predetermined direction.

JP 2012-64500 A

  A vehicular lamp is provided with a light guide that guides light emitted from a light source inside a lamp casing formed by a cover and a lamp housing, and the light guided by the light guide is directed outward. (For example, see Patent Document 1).

  In the vehicular lamp described in Patent Document 1, the light guide is formed in a rod shape extending in a predetermined direction, and the light guide is formed with one end surface in the longitudinal direction as an incident surface. The light emitted from the light source and incident on the light guide from the incident surface is guided inside the light guide, reflected by the reflection step formed on the peripheral surface, emitted from the peripheral surface, and irradiated to the outside. .

  However, when a light guide formed in a rod shape extending in a predetermined direction is used as in the vehicle lamp described in Patent Document 1, light emitted from a position away from the light source is emitted. As a result, the light becomes less uniform and light cannot be emitted uniformly from the entire light guide, which may cause uneven light.

  In view of the above, an object of the present invention is to overcome the above-described problems and to suppress the occurrence of light unevenness by emitting light uniformly from the entire light guide.

  First, a vehicular lamp according to the present invention includes a lamp housing having an opening on at least one side, a cover that covers the opening of the lamp housing, an end surface extending in a predetermined direction, and one end surface in a longitudinal direction being emitted from a light source. A first light guide that is formed as an exit surface that is formed as an entrance surface for incident light and is formed as an exit surface that emits light that is partially guided inside, and in a predetermined direction. At least a part of the extension is disposed along the first light guide, and one end surface in the longitudinal direction is formed as a light source light incident surface on which light emitted from the light source is incident, and each part of the peripheral surface enters. A second light guide that is formed as a light surface and a light exit surface and guides the incident light therein, and at least one of the light that is incident on the first light guide from the incident surface and is guided inside. Part exits from the exit surface. The light incident on the second light guide from the light incident surface, and the light incident on the second light guide from the light incident surface and the light source incident surface to the second light guide. Light that is incident and guided inside is emitted from the light exit surface.

  Thereby, in at least a part of the second light guide, light incident from the first light guide and light incident from the light source light incident surface and guided inside are emitted from the light exit surface.

  Secondly, in the vehicle lamp according to the present invention described above, it is desirable that a total reflection step for reflecting light toward the emission surface is formed on the peripheral surface of the first light guide.

  Thereby, the quantity of the light which goes to an output surface among the light guide | induced inside the 1st light guide increases.

  3rdly, in the vehicle lamp which concerns on above-described this invention, it is desirable that a part of said 2nd light guide is arrange | positioned along the said 1st light guide.

  Thereby, it becomes possible to make arrangement space which combined the 1st light guide and the 2nd light guide into the minimum necessary size.

  Fourthly, in the vehicle lamp according to the present invention described above, as the light source, a first light source that is positioned opposite to the incident surface and makes light incident on the first light guide from the incident surface; It is desirable that a second light source that is positioned opposite to the light source light incident surface and that allows light to be incident on the second light guide from the light source light incident surface is provided.

  Thereby, light is incident on the first light guide and the second light guide from different light sources.

  Fifth, in the vehicle lamp according to the present invention described above, a light reflecting step for reflecting light toward the light exit surface is formed on the second light guide, and the light reflecting step is the second light guide. It is desirable that both the direction in which the light guide extends and the direction in which the light incident surface faces are inclined.

  As a result, both the light incident on the second light guide from the first light guide and the light guided inside the second light guide easily reach the light reflection step.

  According to the present invention, in at least a part of the second light guide, the light incident from the first light guide and the light incident from the light source light incident surface and guided inside are emitted from the light exit surface. Therefore, it is possible to uniformly emit light from the entire light guide and suppress the occurrence of light unevenness.

2 to 5 show an embodiment of a vehicular lamp according to the present invention, and this figure is a schematic cross-sectional view of the vehicular lamp. It is a schematic perspective view which shows two light guides and two light sources. It is a figure which shows an optical path in the cross section which follows the III-III line | wire of FIG. It is a figure which shows an optical path in the cross section which follows the IV-IV line | wire of FIG. It is a figure which shows an optical path in the cross section which follows the VV line | wire of FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing the vehicle lamp of this invention is demonstrated with reference to an accompanying drawing.

  The embodiment described below is applied to a clearance lamp that functions as a vehicle width lamp. The scope of application of the present invention is not limited to the clearance lamp, but is a head lamp, tail lamp, turn signal lamp, stop lamp, daytime running lamp, cornering lamp, hazard lamp, position lamp, back lamp, fog lamp, or these lamps. The present invention can be widely applied to various vehicle lamps such as a combination lamp.

  Hereinafter, an example in which the light irradiation direction is set to the front will be described.

  The vehicular lamps 1 and 1 are, for example, mounted and arranged at both left and right end portions of a front end portion of a vehicle body (not shown).

  The vehicular lamp 1 includes a lamp housing 2 having a recess opened forward and a cover 3 that closes the opening of the lamp housing 2 (see FIG. 1). The lamp housing 2 and the cover 3 constitute a lamp outer casing 4, and the inner space of the lamp outer casing 4 is formed as a lamp chamber 5.

  A lamp unit 6 is disposed in the lamp chamber 5. The lamp unit 6 includes a holding member 7, an inner lens 8, a first light guide body 9, and a second light guide body 10 (see FIGS. 1 and 2).

  The holding member 7 is formed in a shallow concave shape opened forward, and has a first holding portion 7a and a second holding portion 7b. The 1st holding | maintenance part 7a and the 2nd holding | maintenance part 7b are provided continuously up and down.

  The outer periphery of the inner lens 8 is attached to the outer periphery of the holding member 7. For example, lens steps 8a, 8a,... For diffusing light are formed on the front surface of the inner lens 8. When the inner lens 8 is attached to the holding member 7, an arrangement space 11 in which the first light guide 9 and the second light guide 10 are arranged is formed.

  The first light guide 9 is held by the first holding portion 7 a of the holding member 7. The first light guide 9 is formed in a substantially cylindrical shape extending in a predetermined direction, for example, the left-right direction. The shape of the first light guide 9 is arbitrary as long as it extends in a predetermined direction. For example, the first light guide 9 may be formed in a partially bent shape.

  One end surface of the first light guide 9 in the longitudinal direction is formed as an incident surface 12. At the upper end of the peripheral surface 13 of the first light guide 9, total reflection steps 13a, 13a,... Aligned in the longitudinal direction are formed. The surface of the first light guide 9 opposite to the total reflection steps 13a, 13a,... On the peripheral surface 13 is formed as an exit surface 13b.

  The second light guide 10 is held by the second holding portion 7 b of the holding member 7. The second light guide 10 is formed in a flat prismatic shape (plate shape) that extends in a predetermined direction, for example, the left-right direction and the thickness direction is the front-rear direction. The shape of the second light guide 10 is arbitrary as long as it is a shape extending in a predetermined direction. For example, the second light guide 10 may be formed in a partially bent shape.

  The second light guide 10 is formed such that one end surface in the longitudinal direction is formed as a light source light incident surface 14, and the vertical width increases as the distance from the light source light incident surface 14 increases. As for the 2nd light guide 10, the upper surface in the surrounding surface 15 is formed as the light-incidence surface 15a, and the front surface in the surrounding surface 15 is formed as the light emission surface 15b. On the rear surface of the peripheral surface 15 of the second light guide 10, light reflecting steps 15c, 15c,... Arranged in the longitudinal direction are formed. The light reflecting steps 15c, 15c,... Are formed in a shape that is inclined with respect to the extending direction of the second light guide 10 and the direction in which the light incident surface 15a faces.

  The light reflection steps 15c, 15c,... Are formed on the rear surface of the peripheral surface 15 other than the end on the light incident surface 15a side. Therefore, light reflection steps 15c, 15c,... Are not formed at the end of the rear surface of the peripheral surface 15 on the light incident surface 15a side, and the width of the light incident surface 15a in the front-rear direction is the light reflection step 15c. , 15c,... Are not made smaller than the width in the front-rear direction.

  Thus, since the width in the front-rear direction of the light incident surface 15a is not reduced and is kept constant, the light emitted from the first light guide 9 is transmitted from the light incident surface 15a to the second light guide. The amount of light incident on the second light guide 10 is increased when the light is incident on the inside of the light body 10 to be described later, and the light emitted from the first light guide 9 is effectively utilized. In addition, the luminance of the light emitted from the second light guide 10 can be improved.

  A part of the second light guide 10, for example, a substantially half part in the longitudinal direction is arranged along the first light guide 9, and enters the part arranged along the first light guide 9. The light surface 15a is positioned opposite to the light guide surface 9b in the vicinity of the light exit surface 13b. The portion of the second light guide 10 that is disposed along the first light guide 9 is a facing portion 10a, and the portion that is not disposed along the first light guide 9 is a non-facing portion 10b. Has been.

  In the second light guide 10, the light source light incident surface 14 is formed as an end surface of the non-facing portion 10b.

  A first light source 16 is disposed at a position facing the incident surface 12 of the first light guide 9. For example, a light emitting diode (LED) is used as the first light source 16, and light is emitted from the first light source 16 toward the incident surface 12.

  A second light source 17 is disposed at a position facing the light source light incident surface 14 of the second light guide 10. For example, a light emitting diode (LED) is used as the second light source 17, and light is emitted from the second light source 17 toward the light source light incident surface 14.

  Below, the irradiation state of the light in the vehicle lamp 1 configured as described above will be described (see FIGS. 3 to 5).

  When light is emitted from the first light source 16, the emitted light is incident on the inside of the first light guide 9 from the incident surface 12 (see FIG. 3). The light incident on the inside of the first light guide 9 is guided in the longitudinal direction while repeating internal reflection except for a part. Of the light guided inside the first light guide 9, the light reaching the total reflection steps 13a, 13a,... Is totally reflected at the total reflection steps 13a, 13a,. The light is emitted toward the second light guide 10 (see FIGS. 3 and 4).

  The light emitted from the emission surface 13b toward the second light guide 10 enters the second light guide 10 from the light incident surface 15a. The light incident on the inside of the second light guide 10 is guided downward while repeating internal reflection except for a part. Of the light guided inside the second light guide 10, the light reaching the light reflecting steps 15c, 15c,... Is totally reflected by the light reflecting steps 15c, 15c,. Among them, the light is emitted from a portion formed in the facing portion 10a, is transmitted through the inner lens 8 and the cover 3 in order, and is irradiated forward.

  At this time, light is diffused by the lens steps 8a, 8a,... Of the inner lens 8 and irradiated forward.

  On the other hand, when light is emitted from the second light source 17, the emitted light enters the second light guide 10 from the light source light incident surface 14 (see FIGS. 3 and 5). The light incident on the inside of the second light guide 10 is guided in the longitudinal direction while repeating internal reflection except for a part. Of the light guided inside the second light guide 10, the light reaching the light reflection steps 15c, 15c,... Is totally reflected by the light reflection steps 15c, 15c,. It is emitted toward the front. The light emitted forward from the light exit surface 15b is sequentially transmitted through the inner lens 8 and the cover 3 and is irradiated forward.

  At this time, light is diffused by the lens steps 8a, 8a,... Of the inner lens 8 and irradiated forward.

  As described above, in the vehicular lamp 1, the first light guide 16 is emitted from the first light source 16 from the portion formed on the facing portion 10 a of the light output surface 15 b of the second light guide 10. The light incident on the second light guide 10 from the body 9 and the light emitted from the second light source 17 and guided inside the second light guide 10 are emitted forward, and the second Only light emitted from the second light source 17 and guided inside the second light guide 10 is emitted forward from the portion of the light exit surface 15b of the light guide 10 formed in the non-opposing portion 10b. Is done.

  As described above, in the vehicular lamp 1, the second light guide 10 emits from the first light source 16 from the facing portion 10 a located on the side away from the second light source 17. The light incident on the second light guide 10 from the first light guide 9 and the light emitted from the second light source 17 and guided inside the second light guide 10 are directed forward. The non-opposing portion 10 b that is emitted and located on the side closer to the second light source 17 in the second light guide 10 is emitted from the second light source 17 and guided inside the second light guide 10. Only the emitted light is emitted forward.

  Therefore, the light incident from the first light source 16 and the second light source 17 from the facing portion 10 a where the amount of light emitted from the second light source 17 of the second light guide 10 decreases. Since the incident light is emitted forward, it is possible to emit light uniformly from the entire second light guide 10 and suppress the occurrence of light unevenness.

  Moreover, since the total reflection step 13a, 13a, ... which reflects light toward the output surface 13b is formed in the surrounding surface 13 of the 1st light guide 9, the quantity of the light which goes to the output surface 13b is formed. By increasing the number, it is possible to reliably emit a large amount of light from the emission surface 13b.

  Furthermore, since a part of the second light guide 10 is arranged along the first light guide 9, an arrangement space combining the first light guide 9 and the second light guide 10 is provided. It becomes possible to make the required minimum size, and it is possible to emit light uniformly from the entire second light guide 10 without increasing the size of the vehicular lamp 1.

  Furthermore, a first light source 16 that makes light incident on the first light guide 9 from the incident surface 12 and a second light source 17 that makes light incident on the second light guide 10 from the light source light incident surface 14 are provided. The light guide is provided so that light is incident on the first light guide 9 and the second light guide 10 from different light sources.

  Therefore, the light emitted from the first light source 16 and the second light source 17 can be reliably incident on the first light guide 9 and the second light guide 10, and the emitted light can be Effective utilization can be achieved.

  Note that the vehicular lamp 1 may be configured such that light is incident on the first light guide 9 and the second light guide 10 from the same light source.

  In addition, light reflecting steps 15c, 15c,... That reflect light toward the light exit surface 15b are formed on the second light guide 10, and the light reflecting steps 15c, 15c,. Both are inclined with respect to the direction in which the light body 10 extends and the direction in which the light incident surface 15a faces.

  Therefore, by forming the light reflection steps 15c, 15c,..., It is possible to increase the amount of light traveling toward the light exit surface 15b and to reliably emit a large amount of light from the light exit surface 15b, and to perform the light reflection step 15c. , 15c,..., 15c,... Are incident on the second light guide 10 from the first light guide 9 and emitted from the second light source 17 to the second light guide 10. The light guided inside can be efficiently emitted from the light exit surface 15b.

  Note that, as described above, the second light guide 10 is formed so that the width increases as the distance from the light source light incident surface 14 increases, and uniform light with less unevenness is easily emitted from the light output surface 15c. Become.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp, 2 ... Lamp housing, 3 ... Cover, 9 ... 1st light guide, 10 ... 2nd light guide, 12 ... Incident surface, 13 ... Peripheral surface, 13a ... Total reflection step, 13b DESCRIPTION OF SYMBOLS ... Outgoing surface, 14 ... Light source light incident surface, 15 ... Circumferential surface, 15a ... Incident surface, 15b ... Outgoing surface, 15c ... Light reflection step, 16 ... First light source, 17 ... Second light source

Claims (5)

A lamp housing having an opening in at least one;
A cover covering the opening of the lamp housing;
Light that extends in a predetermined direction and has one end surface in the longitudinal direction as an incident surface on which light emitted from the light source is incident, and a part of the peripheral surface is formed as an output surface that emits light guided inside. A first light guide that guides the inside;
At least a portion extending in a predetermined direction is disposed along the first light guide, and one end surface in the longitudinal direction is formed as a light source light incident surface on which light emitted from the light source is incident. A second light guide that is formed as a light entrance surface and a light exit surface and guides the incident light therein,
At least a part of the light that is incident on the first light guide from the incident surface and guided inside is emitted from the light exit surface and is incident on the second light guide from the light incident surface,
Light that is incident on the second light guide from the light incident surface and light that is incident on the second light guide from the light source incident surface and guided therein are emitted from the light exit surface. Vehicle lamp. The vehicular lamp according to claim 1, wherein a total reflection step for reflecting light toward the emission surface is formed on a peripheral surface of the first light guide. The vehicular lamp according to claim 1, wherein a part of the second light guide is disposed along the first light guide. As the light source, a first light source that is positioned facing the incident surface and makes light incident on the first light guide from the incident surface, and is positioned facing the light source light incident surface and is incident on the light source light The vehicular lamp according to claim 1, further comprising a second light source that allows light to enter the second light guide from a surface. A light reflecting step for reflecting light toward the light exit surface is formed on the second light guide;
5. The vehicle according to claim 1, wherein the light reflecting step is inclined with respect to a direction in which the second light guide body extends and a direction in which the light incident surface faces. Light fixture.

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