JP2015185524A - Lighting tool for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting tool for vehicle having a guide light body which improves utilization efficiency of light by internally reflecting the light incident from one end of the light guide body at a step towards a front side of the lighting tool and collecting all the light that has passed the guide light body at a reflector.SOLUTION: In a lighting chamber of a lighting tool for vehicle, there are provided: a guide light body 12; a first light source 10 for emitting light from one end face 20 of the guide light body 12; a first step 13 formed on a rear portion of the guide light body 12 so that the incident light is internally reflected in a front side of the lighting tool; and a first reflector 15 for reflecting the light emitted from the other end face 21 of the guide light body 12 toward the front side of the lighting tool. The light passed the guide light body 12 without internally being reflected in the first step 13 is reflected at the first reflector 15 disposed opposite to the other end face 21 of the guide light body 12 toward the front side of the lighting tool so that the incident light in the guide light body 12 is effectively used, thereby improving a visibility of the whole lighting tool for vehicle.

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp that includes a light guide.

  Conventionally, as in the vehicular lamp shown in Patent Document 1 and FIG. 7, the light emitted from the light source 101 of the LED is incident on one end surface of the light guide 102 and then provided on the rear surface portion of the light guide 102. 2. Description of the Related Art A vehicular lamp configured to emit light in front of a lamp by performing internal reflection with a plurality of reflecting elements 103 is known.

JP 2012-174461 A

  However, according to the conventional vehicular lamp, a part of the light incident from one end surface of the light guide 102 passes through the light guide 102 without being reflected by the reflecting element 103, and passes through the light guide 102. Because the light leaks from the other end surface of the light, there is a problem that the light use efficiency is poor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicular lamp that can effectively use light leaked from the other end surface through a light guide in a vehicular lamp that includes a light guide. .

In order to solve the above problems, the vehicular lamp according to the present invention employs the following means.
(1) A light guide, a first light source that makes light incident from one end face of the light guide, and a first step formed on the rear surface of the light guide so that the incident light is internally reflected forward of the lamp And a first reflector that reflects light emitted from the other end face of the light guide forward of the lamp.

(2) A second light source is disposed behind the light guide, and a second step is provided in the light guide so that light from the second light source diffuses inside the light guide. (1) The vehicular lamp according to (1).

(3) The first light source and the second light source include a light source control device that emits light of different colors, and turns off or dimmes the other light source when one of the light sources is turned on ( 2) The vehicular lamp described in the above.

(4) A substrate on which the first light source and the second light source are mounted on the same surface is provided behind the light guide, and the light from the first light source is reflected around the light guide to guide the light. The vehicle lamp according to (2) or (3), wherein a second reflector that is incident on one end face of the second reflector is provided.

(5) The vehicular lamp according to (4), wherein the lamp body that holds the substrate is provided with a plurality of radiating fins that protrude toward the rear of the lamp.

  According to the vehicle lamp of (1) above, the light incident on the one end surface of the light guide from the first light source is internally reflected to the front of the lamp by the first step formed on the rear surface of the light guide. Since the light that has reached the other end surface without being reflected on the inner surface and exited is reflected by the reflector to the front of the lamp, the utilization efficiency of the light incident on the light guide can be increased. In addition, since the light emitting area of the vehicular lamp is enlarged, the visibility of the vehicular lamp can be improved.

  According to the vehicular lamp of (2) above, the light guide used for the first light source is used as it is, and the light from the second light source is diffused inside the light guide in the second step. Therefore, there is an effect that light having a plurality of functions can be turned on by one light guide. In addition, when the light of a plurality of light sources is incident and used as light having the same function, there is an effect that the total light amount can be increased.

  According to the vehicular lamp of the above (3), when the first light source and the second light source emit light of different colors, the other light source can be turned off or dimmed when one of the light sources is turned on. Since the apparatus is provided, in the vehicular lamp that emits light of a plurality of functional colors, there is an effect that a clear light distribution pattern can be formed without impairing the function of each light.

  According to the vehicle lamp of the above (4), the second reflector that allows the light from the first light source to enter the one end face of the light guide is provided, and the first light source and the second light source are the same on the same substrate. By being mounted on the surface, there is an effect that the number of parts can be reduced and the size of the vehicular lamp can be made more compact.

  According to the vehicle lamp of the above (5), there is an effect that the heat of the light source can be efficiently radiated by providing the plurality of heat dissipating fins protruding toward the rear of the lamp on the lamp body holding the substrate. .

1 is a front view of a motorcycle showing a vehicular lamp according to the present invention. It is the AA line enlarged view of FIG. 1 which showed the vehicle lamp of Example 1 of this invention. It is the AA line enlarged view of FIG. 1 which showed the vehicle lamp of Example 2 of this invention. It is the schematic which showed the function of the vehicle lamp of Example 3 of this invention. It is the AA line enlarged view of FIG. 1 which showed the vehicle lamp of Example 4 of this invention. It is the AA expanded view of FIG. 1 which showed the vehicle lamp of Example 5 of this invention. It is the schematic which shows the conventional vehicle lamp.

  Hereinafter, some embodiments embodying the present invention will be described with reference to the drawings. FIG. 1 schematically shows an external appearance common to the respective embodiments. A vehicular lamp 1 shown in FIG. 1 is a turn signal lamp of a motorcycle 2. The vehicular lamp 1 is held on the vehicle body 4 via a stay 3. As shown in the enlarged view, the vehicular lamp 1 includes a lamp chamber 19 inside a lamp body 17 and an outer lens 18 that also serves as a cover. The lamp chamber 19 houses the light source 10 (see FIG. 2), the light guide 12, the first reflector 15, and the like. A large number of steps 13 are formed on the rear surface of the light guide 12 so that the light from the light source 10 is internally reflected forward of the lamp.

  Here, the type of the light source is not particularly limited. For example, a semiconductor light source such as an LED or an LD can be employed. The shape of the light guide is not particularly limited, but various shapes such as a rectangle or a circle can be employed. Further, the specific direction of the direction in which the light guide extends is not particularly limited. The specific material of the light guide is not particularly limited, but a transparent material made of resin or glass can be used.

  In the vehicular lamp 1 according to the first embodiment, as illustrated in FIG. 2, a light source 10, a light guide 12, and a first reflector 15 are accommodated in a lamp chamber 19 formed between a lamp body and an outer lens. .

  Light from the light source 10 is incident from the incident end face 20 of the light guide 12. The incident light is internally reflected at step 13 formed on the rear surface portion of the light guide 12 and reflected forward of the lamp. On the other hand, the light passing through the light guide 12 without being internally reflected in step 13 reaches the other end surface 21 of the light guide 12 and is emitted from the other end surface 21 to the outside of the light guide 12.

  The light emitted from the other end surface 21 is collected by the first reflector 15 disposed so as to face the other end surface 21 and then reflected forward of the lamp.

  Therefore, according to the vehicular lamp of the first embodiment, a part of the light incident on the light guide 12 from the light source 10 is internally reflected to the front of the lamp at the plurality of steps 13 arranged on the rear surface portion of the light guide 12. The light guide 12 can emit light with substantially uniform brightness over the entire length. In addition, the light that passes through the light guide 12 without being reflected at the inner surface in step 13 is collected by the first reflector 15 and reflected to the front of the lamp, thereby increasing the utilization efficiency of the light incident on the light guide 12. be able to.

  Further, since the light emitting area of the vehicular lamp 1 is increased by the amount of the first reflector 15, the visibility of the vehicular lamp 1 can be enhanced.

  In the vehicular lamp 1 according to the second embodiment, as illustrated in FIG. 3, a first light source 10, a second light source 11, a light guide 12, and a first reflector 15 are accommodated in a lamp chamber 19.

  The first step 13 is formed on the rear surface portion of the light guide 12, but the first step 13 is not formed on the portion facing the second light source 11 disposed behind the light guide 12. . In a portion facing the second light source 11, a second step 14 is formed on the front surface of the light guide 12. The size and shape of the second step 14 are not particularly limited, but can be formed in a size and shape that does not block the incident light from the first light source 10.

  The light from the second light source 11 is incident from the center rear side of the light guide 12 and is diffused or branched in the left and right directions inside the light guide 12 by the second step 14. Thereafter, a part of the diffused light from the second step 14 is internally reflected to the front of the lamp in the first step 13 and the remaining light exits the light guide 12 from the other end surface 21 and then the first reflector. 15 is reflected forward of the lamp.

  Therefore, according to the vehicular lamp of the second embodiment, the light guide 12 that guides the light from the first light source 10 is used, and the light from the second light source 11 is internally reflected by the second step 14 to guide the light. Can be diffused to the left and right. Therefore, a plurality of types of light having different functions can be emitted by one light guide.

  In the vehicular lamp 1 according to the third embodiment, as illustrated in FIG. 4, the first light source 10 and the second light source 11 emit light of different colors. For example, the first light source 10 generates white light suitable for a clearance lamp (CLL) and the second light source 11 generates amber light suitable for a turn signal lamp (TSL). 11 can be assigned lights having different functions. The light sources 10 and 11 are controlled to be turned on / off and dimmed by the light source control device 30.

  For example, as shown in FIG. 4A, when the first light source 10 is lit, white light is emitted from the light guide 12 and the first reflector 15, and this vehicular lamp functions as a CLL. Can be made. On the other hand, as shown in FIG. 4B, when the second light source 11 is turned on, the light source control device 30 turns off the first light source 10 or dims the light source 12 and the first reflector 15. The amber light can be clearly emitted from the vehicle so that the vehicular lamp can function as a TSL.

  Therefore, according to the vehicular lamp of the third embodiment, in the application in which the first light source 10 and the second light source 11 emit different colors of light, the other light source is controlled by the light source control device 30 when one of the light sources is turned on. By controlling the light output, it is possible to successfully harmonize a plurality of illumination functions with a single vehicle lamp.

  In the vehicular lamp of the fourth embodiment, as shown in FIG. 5, a substrate 17 is disposed behind the light guide 12, and the first light source 10 and the second light source 11 are mounted on the same surface of the substrate 17. Yes. In addition, a second reflector 16 that reflects light from the first light source 10 and enters the one end face 20 of the light guide 12 is provided around the light guide 12.

  Therefore, according to the vehicular lamp of the fourth embodiment, the first light source 10 and the second light source 11 can be mounted on the same substrate 17 to reduce the number of parts and to make the entire vehicular lamp compact. Further, since the light sources 10 and 11 are mounted in parallel on the same substrate 17, not only the wiring of the substrate 17 can be simplified, but also the parts can be shared.

  In the vehicular lamp of the fifth embodiment, the substrate 17 is held on the substrate fixing surface 22 of the lamp body 5 as shown in FIG. The lamp body 5 is provided with a plurality of radiating fins 18 projecting toward the rear of the substrate fixing surface 22. The lamp body 5 and the heat radiating fins 18 are made of, for example, metal, and are preferably made of aluminum die cast.

  Therefore, according to the vehicular lamp of the fifth embodiment, there is an advantage that the heat generated by the first light source 10 and the second light source 11 can be efficiently radiated from the radiating fin 18 through the common substrate 17.

The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing the configuration of each part without departing from the spirit of the invention, as exemplified below.
(A) Although not shown, each of the first reflector 15 and the second reflector 16 can have a fixing portion that is fixed to the lamp body 5 or the substrate 17.
(B) Although the 2nd light source 11 of Example 2 is arrange | positioned in the back of the substantially center part of the light guide 12 for convenience of explanation, the position is not limited and the light source is behind the light guide 12. It is sufficient if the second step 14 is formed on the front surface of the portion facing the second light source 11. Further, the second light source 11 may be a single light source or a plurality of second light sources 11, and when a plurality of second light sources 11 are prepared, the total amount of light can be increased and the visibility of the own vehicle is improved. can do.
(C) The color of the light assigned to each light source of the third embodiment is not limited to the embodiment, and the function of light is achieved by turning off or dimming the other light source when one of the light sources is turned on. Any combination that is not impaired can be employed. For example, a combination of daytime running lamp (DRL) and TSL, tail lamp (TL) and TSL, back lamp and TL.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Motorcycle 3 Stay 4 Car body 5 Lamp body 6 Outer lens 7 Lamp chamber 10 1st light source 11 2nd light source 12 Light guide 13 1st step 14 2nd step 15 1st reflector 16 2nd reflector 17 Board | substrate 18 Radiation fin 19 Light chamber 20 Incident end face 21 Other end face 22 Substrate fixing face

Claims (5)

A light guide, a first light source for allowing light to enter from one end surface of the light guide, and a first step formed on the rear surface of the light guide so that the incident light is internally reflected forward of the lamp, A vehicle lamp comprising: a first reflector that reflects light emitted from the other end surface of the light guide body forward of the lamp. A second light source is disposed behind the light guide, and a second step is provided in the light guide so that light from the second light source is diffused inside the light guide. The vehicular lamp according to claim 1. The first light source and the second light source each include a light source control device that emits light of different colors and turns off or dimmes the other light source when one of the light sources is turned on. The vehicle lamp according to 2. A substrate on which the first light source and the second light source are mounted on the same surface is provided behind the light guide, and the light from the first light source is reflected and guided around the light guide. 4. The vehicular lamp according to claim 2, further comprising a second reflector that is incident on one end surface of the light body. The vehicular lamp according to claim 4, wherein the lamp body holding the substrate is provided with a plurality of radiating fins protruding toward the rear of the lamp.