JP2011258350A - Lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture for vehicle using a light guide member in which uniform light distribution is attained and appearance at the time of non-lighting is improved as well as cost reduction realized.SOLUTION: The lighting fixture for vehicle using a light guide member 4 has, on the prism surface 5 formed on the rear side of the light guide member 4, a first prism region 8 which reflects the direct light from a first light source 2 installed in the light incident part 7a at the vehicle inner end part and the light internally reflected by the light guide member 4 out of light from the first light source 2, and emits from an emitting face 6 of the light guide member 4 to the vehicle optical axis direction and a second prism region 9 which reflects the direct light from a second light source 3 installed in the light incident part 7B at the vehicle outer end part and the light internally reflected by the light guide member 4 out of light from the second light source 3, and emits from the emitting face 6 of the light guide member 4 to the vehicle optical axis direction.

Description

  The present invention relates to a vehicular lamp using a light guide member, and in particular, allows light to be incident from both side ends of the light guide member so that light is uniformly and efficiently emitted from the entire surface of the light guide member. The present invention relates to a vehicular lamp that can improve the function and design of a vehicular headlamp and a marker lamp.

Conventionally, in a vehicular lamp using a semiconductor light emitting element (for example, LED) as a light source, in order to reduce the size of the lamp and improve its appearance, a unit shape composed of a light guide member and a semiconductor light emitting element light source 2. Description of the Related Art A vehicular lamp in which a lamp is arranged in a lamp housing is known (for example, Patent Document 1 and Patent Document 2).

  The vehicular lamp described in Patent Document 1 includes a light guide member and a light source disposed in the vicinity of both end faces of the light guide member. For example, a minute glass bead is used as a diffuse radiation means inside the light guide. It is provided to obtain uniform diffused light from the light guide.

In the vehicular lamp described in Patent Document 2, the light emitted from the first light emitting element disposed at the end of the light guide is repeatedly reflected on the inner surface of the light guide to illuminate the base region. The light emitted from the second light emitting element disposed at the other end of the light is formed so as to illuminate the apron region. At this time, the light emitted by the steps provided in the base region and the apron region is diffused, and the emitted light from each region is uniformly emitted toward the front.

JP-A-9-207661 JP 2006-236588 A

  However, the vehicular lamp described in Patent Document 1 requires diffusion and emission means such as fine glass beads provided in the light guide for the light from the light source, which is a factor in reducing the appearance and cost of the lamp. It was. In addition, when the light source is provided at both ends of the light guide, the amount of light is different in the vicinity of the light source and in a place far from the light source, that is, unevenness in the brightness is likely to occur, and it is difficult to light the light guide uniformly. There was a problem that made it look bad.

  On the other hand, in the vehicular lamp described in Patent Document 2, unevenness is likely to occur in the brightness of light emitted from the base region and the apron region, which has been a factor that deteriorates the light distribution performance and appearance. In addition, in order to make the base region and the apron region shine uniformly, a step is required on the exit surface of the light guide, which causes a decrease in appearance when not lit and increases the cost of the lamp.

  Therefore, the present invention has been made in view of the above problems, and in a vehicle lamp using a light guide member, an improvement in appearance due to uniform light distribution during lighting, an improvement in appearance during non-lighting, and cost. An object of the present invention is to provide a vehicular lamp that can reduce the above.

  In order to solve the above-described problems, a vehicular lamp according to the present invention includes a plate-shaped light guide member that has light incident portions at both ends and is inclined in the vehicle front-rear direction, and the light incident portion. A vehicle lamp comprising a light source composed of semiconductor light emitting elements arranged opposite to each other, wherein a surface of the light guide member on the vehicle rear side is formed as a prism surface, and the prism surface has an inner end portion of the vehicle. The direct light from the first light source provided in the light incident portion and the light reflected from the light guide member among the light from the first light source are reflected, and the vehicle optical axis is reflected from the front surface of the light guide member. A first prism region that emits light in a direction, direct light from a second light source provided at the light incident portion at the outer end of the vehicle, and inner light of the light guide member out of light from the second light source. Second light that reflects and emits light in the direction of the vehicle optical axis from the front surface of the light guide member That by forming a rhythm region, characterized by.

  According to this configuration, when the first light source and the second light source are turned on, the direct light from the first light source disposed in the light incident portion at the inner end of the vehicle and the inner surface of the light guide member are reflected. The reflected light is reflected toward the front surface of the light guide member by the first prism region, and also reflected directly from the second light source disposed at the light incident portion at the outer end of the vehicle and internally reflected in the light guide member. Light is efficiently reflected toward the front surface of the light guide member by the second prism region, and the entire front surface of the light guide member is caused to emit light uniformly. Further, the light by this uniform light emission can be emitted toward the front of the vehicle. Further, with this configuration, it is not necessary to form an optical step or the like on the front surface of the light guide member used in the conventional vehicle lamp, the appearance when not lit is improved, and the cost of the lamp can be reduced. Become.

  In the above configuration, the first prism region includes direct light from the first light source, and a first reflection surface that reflects light reflected from the light guide member among light from the first light source; A configuration may be adopted in which the light reflected by the first reflecting surface is incident and the second reflecting surface is configured to emit the incident light from the front surface of the light guide member to the front of the vehicle.

  According to this configuration, the first prism region is internally reflected from the direct light from the first light source and the inside of the light guide member by two reflections of the reflection on the first reflection surface and the reflection on the second reflection surface. Since the light is irradiated forward, the light from the first light source can be efficiently irradiated forward of the vehicle.

  In the above configuration, the second prism region includes direct light from the second light source, and a third reflection surface that reflects light that is internally reflected by the light guide member among light from the second light source, and From the second light source, a first reflecting part having the fourth reflecting surface that receives the light reflected by the third reflecting surface and emits the incident light from the front surface of the light guide member to the front of the vehicle. And a second reflecting portion having a fifth reflecting surface that directly emits light reflected from the light guide member out of the light from the second light source directly from the front surface of the light guide member to the front of the vehicle. The configuration can be adopted.

  According to this configuration, the second prism region is internally reflected from the direct light from the second light source and the inside of the light guide member by two reflections of the reflection at the third reflection surface and the reflection at the fourth reflection surface. Since the first reflecting portion that irradiates the light forward and the second reflecting portion that includes the fifth reflecting surface that directly irradiates the incident light forward, the second reflecting portion suppresses the loss of light from the second light source. The light from the two light sources can be efficiently irradiated to the front of the vehicle.

  In the above configuration, in the second reflecting portion of the second prism region, the emitted light from the second light source is totally reflected on the back surface of the emitting surface of the light guide member, and is parallel to the irradiation optical axis of the second light source. The structure formed in the said 1st light source side rather than the position which injects into can be employ | adopted.

  According to this configuration, the second reflecting portion is provided on the first light source side with respect to the position where the reflected light is incident in parallel to the irradiation optical axis of the second light source, so that uniform light distribution over the entire surface of the light guide member is achieved. Enable.

  In the above configuration, the first prism region and the second prism region are formed continuously and integrally, and the prism is formed in a cross-sectional wave shape on the back surface of the first prism region and the second prism region. A configuration in which a reflecting surface having a shape is provided.

  According to this configuration, by forming the continuous prism-shaped reflecting surface having a cross-sectional wave shape on the back surface of the light guide member, it is possible to improve the appearance when the light is not lit. In addition, a uniform light distribution can be obtained over the entire surface of the light guide member.

According to the vehicular lamp of the present invention, when the first light source and the second light source are turned on, the entire front surface of the light guide member is caused to emit light uniformly, and the light emitted by the uniform light emission can be emitted toward the front of the vehicle. Since it becomes possible, the appearance at the time of lighting improves. Moreover, since it is not necessary to form an optical step etc. in the whole front surface of a light guide member, the appearance at the time of non-lighting also improves and the designability of the whole lamp | ramp improves. Furthermore, the cost of the lamp can be reduced.

The vehicle lamp which concerns on one Embodiment of this invention is shown, (A) is the front view, (B) is AA sectional drawing of (A). It is a figure which shows the optical path in FIG.1 (B). It is an enlarged view of the B section in FIG. It is an enlarged view of the C section in FIG. It is optical path explanatory drawing of a 1st prism area | region. It is optical path explanatory drawing of a 2nd prism area | region. It is explanatory drawing of the 1st reflection part of a 2nd prism area | region. It is explanatory drawing of the 2nd reflection part of a 2nd prism area | region.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

  FIG. 1: shows the vehicle lamp which concerns on embodiment of this invention, (A) is the front view, (B) is the AA cross section of (A). 2 is an explanatory diagram of an optical path in FIG. 1B, FIG. 3 is an enlarged view of a portion B in FIG. 1B, and FIG. 4 is an enlarged view of a portion C in FIG.

  1 to 4, a vehicular lamp 1 is disposed together with a traveling lamp and a passing lamp in a lamp housing of a vehicular headlamp (not shown) disposed at the front of an automobile, for example. That is, it is used as a lamp having a function of a clearance lamp.

As shown in FIGS. 3 and 4, the vehicular lamp 1 includes a plate-shaped light guide member 4 having light incident portions 7a and 7b at both ends, and a first light guide member 4 disposed opposite the light incident portions 7a and 7b. One light source 2 and a second light source 3 are provided. As shown in FIGS. 1B and 2, the vehicular lamp 1 is provided in the lamp housing so as to incline in the front-rear direction from the vehicle inner side to the vehicle outer side (vehicle front).

  The first light source 2 uses a semiconductor light emitting element such as an LED as a light source. As shown in FIG. 3, the first light source 2 has its light emitting surface directed into the light incident portion 7a formed as a semispherical recess in the vehicle inner end portion of the light guide member 4, and the first light source 2 It arrange | positions adjacent to the light-incidence part 7a so that almost all of the light irradiated from 1 light source 2 may enter into the light-incidence part 7a without waste. Here, the optical axis L1 of the first light source 2 is orthogonal to the outgoing optical axis (not shown) of the vehicular lamp 1.

Similar to the first light source 2, the second light source 3 uses a semiconductor light emitting element such as an LED as a light source. As shown in FIG. 4, the second light source 3 has its light emitting surface directed into the light incident portion 7b formed as a semispherical recess in the vehicle outer end portion of the light guide member 4, and the second light source 3 It arrange | positions adjacent to the light-incidence part 7b so that substantially all of the light irradiated from the two light sources 3 may enter into the light-incidence part 7b without waste. Here, the optical axis L2 of the second light source 3 is orthogonal to the outgoing optical axis (not shown) of the vehicular lamp 1.

As shown in FIGS. 1 and 2, the light guide member 4 is a long and thin plate-like material having a substantially square cross section. The light guide member 4 uses a translucent material made of glass or a synthetic resin material (for example, polycarbonate resin, methacrylic resin, polymetal methacrylate resin, acrylic, etc.), and an irregular reflection material or the like that irregularly reflects inside. Without being provided, it is formed as a simple through lens. The light guide member 4 has a front surface (surface on the front side of the vehicle) that is a simple output surface 6 that emits light, and a rear surface (surface on the rear of the vehicle) of the light guide member 4 is a prism surface. 5 is formed.

As shown in FIG. 2, the prism surface 5 includes a first prism region 8 formed with a cross-sectional wave-like prism surface that refracts and reflects incident light from the first light source 2 toward the front of the vehicle. The second prism region 9 is formed integrally with the prism region 8 and has a cross-sectional wave-like prism surface that refracts and reflects incident light from the second light source 3 toward the front of the vehicle.

  FIG. 5 shows a partially enlarged view of the first prism region 8. In the figure, the first prism region 8 is incident with the direct light from the first light source 2 and the light beam L3 emitted from the first light source 2 and repeatedly reflected from the light guide member 4 to the inner surface. A first reflecting surface 11 that further reflects the light on the inner surface and a second reflecting surface 12 that receives the reflected light from the first reflecting surface 11 and reflects the incident light beam L3 toward the front of the vehicle are provided.

  The first reflection surface 11 and the second reflection surface 12 are reflection surfaces formed continuously, and are formed as a total reflection prism or formed by applying aluminum vapor deposition or silver coating on the back surface of the prism surface. ing.

FIG. 6 shows a partially enlarged view of the second prism region 9. In the figure, the second prism region 9 receives the direct light from the second light source 3 and the light beam L5 emitted from the second light source 3 and repeatedly reflected from the light guide member 4 to the inner surface. Of the second light source 3 of the first light reflecting part 10A for further reflecting the reflected light on the inner surface and irradiating the front of the vehicle, the direct light from the second light source 3 and the light repeatedly reflected on the inner surface of the light guide member 4 A second light beam L6 that is directed toward the other end side (the first prism region 9 side) from a position incident in parallel with the optical axis L2 is incident, and the incident light beam L6 is internally reflected to irradiate the front of the vehicle. Part 10B.

  FIG. 7 shows a partially enlarged view of the first reflecting portion 10A. In the figure, the first reflecting portion 10A receives the direct light from the second light source 3 and the light beam L5 emitted from the second light source 3 and repeatedly reflected inside the light guide member 4 from the inside. A third reflecting surface 13 for reflecting the reflected light on the inner surface and a fourth reflecting surface 14 for reflecting the reflected light from the third reflecting surface 13 further toward the front of the vehicle.

  The third reflecting surface 13 and the fourth reflecting surface 14 are reflecting surfaces formed continuously with each other, and are formed as a total reflection prism or formed by applying aluminum vapor deposition or silver coating on the back surface of the prism surface. ing.

  As shown in FIG. 6, the first reflecting portion 10 </ b> A causes the light L <b> 5 totally reflected by the back surface of the light exiting surface 6 of the light guide member 4 out of the light emitted from the second light source 3 to be emitted from the second light source 3. It is provided closer to the second light source 3 than the position D that is reflected toward the first light source 3 side and is incident on the prism surface 5 substantially parallel to the light emission axis L2.

    Therefore, since the light incident on the first reflecting portion 10A is mainly light directed toward the rear of the vehicle, the third reflecting surface 13 cannot be refracted and reflected as light directed toward the front of the vehicle by the third reflecting surface 13. A part of the light L5 reflected from the vehicle is received by the fourth reflecting surface 14 and can be irradiated toward the front of the vehicle by the fourth reflecting surface 14.

  FIG. 8 shows a partially enlarged view of the second reflecting portion 10B. In the figure, the second reflecting portion 10B reflects the direct light from the second light source 3 and the light beam L6 totally reflected by the back surface of the emitting surface 6 by the fifth reflecting surface 15 to be directed forward of the vehicle. It is comprised so that it may irradiate. Note that a part of the light beam L4 of the light emitted from the first light source 2 is also incident on the second reflecting portion 10B, and when a part of the light beam L4 is incident, a part of the light beam L4 is also the fifth reflecting surface 15. The light is refracted and reflected toward the front of the vehicle.

  The fifth reflection surface 15 is a prism surface and is formed as a total reflection prism, or as a reflection surface by applying aluminum vapor deposition or silver coating on the back surface of the prism surface.

  As shown in FIG. 6, the second reflecting portion 10 </ b> B is configured so that light L <b> 6 totally reflected by the back surface of the light exit surface 6 of the light guide member 4 out of the light emitted from the second light source 3 is emitted from the second light source 3. Reflected toward the first light source 3 side substantially parallel to the emission axis L2, the light beam L6 is provided closer to the first light source 2 than the position D at which it enters the prism surface 5.

  Therefore, the light incident on the second reflecting portion 10 </ b> B is mainly directed toward the front side of the vehicle, so that the fifth reflecting surface 15 can sufficiently irradiate the front side of the vehicle.

  Next, the operation of the vehicular lamp 1 configured as described above will be described. When the first light source 2 and the second light source 3 are turned on, the light from the first light source 2 is incident on the light guide member 4 from the light incident portion 7a, and the light from the second light source 3 is incident on the light incident portion. The light enters the light guide member 4 from 7B.

  Here, since the light guide member 4 is provided to be inclined rearward from the vehicle inner side toward the vehicle outer side, the light L3 incident from the first light source 2 into the light guide member 4 is a part thereof. Is reflected twice by the first reflecting surface 11 and the second reflecting surface 12 in the first prism region 8, is refracted to the front of the vehicle, and is emitted to the front of the vehicle through the emitting surface 6. The remaining part of the light L <b> 3 goes into the second prism region 9, is refracted by the fifth reflecting surface 15 of the second reflecting portion 10 </ b> B in the second prism region 9, and passes through the exit surface 6. Is emitted forward of the vehicle.

  On the other hand, a part L5 of the light incident from the second light source 3 into the light guide member 4 is twice by the third reflecting surface 13 and the fourth reflecting surface 14 in the first reflecting portion 10A of the second prism region 9. The light is reflected and refracted forward of the vehicle, and exits through the exit surface 6 to the front of the vehicle. Further, the remaining part L6 is directed into the second reflecting portion 10B of the second prism region 9, refracted by the fifth reflecting surface 15 in the second reflecting portion 10B, and exits to the front of the vehicle through the exit surface 6. Is done.

  Therefore, according to the vehicular lamp 1, the light from the first light source 2 and the light from the second light source 3 are diffusely reflected by the first prism region 8 and the second prism region 9 provided on the prism surface 5. Thus, the emitted light is uniformly emitted from the emission surface 6 which is the front surface of the light guide member 4. Further, the emitted light is irradiated in front of the vehicle, so that a uniform light distribution is obtained, and a good-looking illumination is obtained. In addition, it is not necessary to provide light control means such as a lens used in a conventional vehicle lamp on the emission surface 6, so that the appearance when not lit can be improved and the cost can be reduced.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 1st light source 3 2nd light source 4 Light guide member 5 Prism surface 6 Output surface 7 Light incident part 8 1st prism area 9 2nd prism area 10A 1st reflection part 10B 2nd reflection part 11 1st reflection Surface 12 second reflecting surface 13 third reflecting surface 14 fourth reflecting surface 15 fifth reflecting surface L1 first light source optical axis L2 second light source optical axis
L3 to L6 rays

Claims (5)

A vehicle comprising a plate-shaped light guide member provided with light incident portions at both ends and inclined in the vehicle front-rear direction, and a light source composed of a semiconductor light emitting element disposed to face the light incident portion. In the lamp, a surface on the vehicle rear side of the light guide member is formed as a prism surface, and direct light from a first light source provided at the light incident portion of the vehicle inner end portion is formed on the prism surface. A first prism region that reflects each light internally reflected by the light guide member out of the light from the first light source and emits the light in the vehicle optical axis direction from the front surface of the light guide member, and the vehicle outer end portion Of the direct light from the second light source provided in the light incident portion and the light from the second light source, the light reflected from the inner surface of the light guide member is reflected, and the vehicle optical axis is reflected from the front surface of the light guide member. For a vehicle, characterized by forming a second prism region for emitting light in a direction Ingredients. The first prism region includes a direct reflection light from the first light source, a first reflection surface that reflects light reflected from the light guide member among the light from the first light source, and the first reflection surface. 2. The vehicular lamp according to claim 1, wherein the vehicular lamp includes a second reflecting surface that receives the light reflected by the light guide and emits the incident light from the front surface of the light guide member to the front of the vehicle. The second prism area includes direct light from the second light source, a third reflecting surface that reflects light reflected from the light guide member among light from the second light source, and the third reflecting surface. A first reflecting portion having a fourth reflecting surface that emits the reflected light from the front surface of the light guide member to the front of the vehicle, and direct light from the second light source; A second reflecting portion having a fifth reflecting surface that directly emits light reflected from the light guide member out of the light from the second light source directly to the front of the vehicle from the front surface of the light guide member. The vehicular lamp according to claim 1 and 2. The second reflection part of the second prism region is more than a position where the light emitted from the second light source is totally reflected by the front surface of the light guide member and is incident in parallel with the irradiation optical axis of the second light source. The vehicular lamp according to claim 1, wherein the vehicular lamp is formed on the first light source side. The first prism area and the second prism area are integrally formed continuously, and a prism-like reflecting surface formed in a cross-sectional wave shape on the back surface of the first prism area and the second prism area. The vehicular lamp according to claim 1, wherein the vehicular lamp is provided.

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