JP2011198537A - Lamp tool for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp tool for a vehicle, capable of efficiently emitting light of a light source, by bringing leak light from a rear-face side of a light guide back into the light guide, and by surely controlling light distribution in an irradiation direction.SOLUTION: The light guide 20 of the lamp tool for a vehicle 10 is provided with first diffusion steps 24 for internally reflecting light α2 of the LED light sources 17 from a front face 23 side of the light guide part 22 toward an irradiation direction 27 at the front of the vehicle. A single body of the first diffusion steps 24 is structured of first step faces 25 as incident faces for the irradiation light α1 to be incident into, and an irradiation face 26 for the irradiation light α1 to irradiate from. Reflecting members 30 are aligned in the vicinity of the rear face of the light guide 20 at a constant interval 28, and are provided with second diffusion steps 31 reflecting the irradiation light α1 toward the first diffusion steps 24 of the light guide 20 at the front face, as well as second step faces 32 as reflecting surfaces for reflecting the irradiation light α1.

Description

  The present invention relates to a vehicular lamp such as an automobile, and more particularly to a vehicular lamp that causes light from an LED light source to enter a light guide disposed in the vicinity and to emit the light from the light guide toward an irradiation direction.

  As an example of a conventional vehicle lamp, in a lamp room defined by a lamp body and a front cover, a strip-shaped light guide disposed along the front cover, and an LED light source disposed in the vicinity of the light guide; A vehicular lamp that forms a predetermined light distribution is known. The light guide is provided with a reflection surface having a diffusion step on the rear surface side, and incident light from the LED light source is reflected by the diffusion step and emitted from the front emission surface in the irradiation direction.

  However, the light guide body has various curved shapes depending on the shape of the front cover and the light distribution pattern, and when the curvature ratio increases, the light guide body does not reflect in the diffusion step and leaks to the rear surface side, so-called omission. Light was generated. In order to prevent this light leakage, a reflective member is arranged in the vicinity of the rear surface side of the light guide so that the light leaking from the diffusion step to the rear surface side is diffusely reflected by the reflective member and returned to the light guide body. A vehicular lamp has been proposed (for example, Patent Document 1).

JP 2007-109654 A

  However, in the above-described vehicular lamp, only by arranging the reflecting member in the vicinity of the rear surface side of the light guide, the light leaked once from the light guide is returned to the light guide and light distribution is controlled in a predetermined direction. Was difficult.

  The present invention has been made in order to solve the above-described problems. The light emitted from the rear surface side of the light guide is returned to the light guide and light distribution control is reliably performed in the irradiation direction. It is in providing the vehicle lamp which can radiate | emit efficiently.

  The object of the present invention is to provide a light source, a light guide portion that is disposed along the optical axis direction of the light source, has an incident portion in the vicinity of the light source, and guides incident light that has entered from the incident portion. A first step formed on the rear surface of the light guide portion and internally reflecting the incident light from the front surface of the light guide portion toward the irradiation direction; and in the vicinity of the rear surface of the light guide body A reflecting member that is disposed along the light guide and has a second step on the front surface that reflects outgoing light emitted rearward from the rear surface of the light guide toward the first step of the light guide. And a vehicle lamp characterized by comprising:

  According to the vehicular lamp having the above-described configuration, the light guide having the first step on the rear surface, and the reflection member disposed in the vicinity of the rear surface side of the light guide and having the second step on the front surface, Light leaking from the rear surface side of the light guide can be reflected by the second step of the reflecting member, and can be reliably returned to the light guide again from the first step. Thereby, while being able to radiate | emit efficiently from the front surface of a light guide, light distribution control can be accurately performed toward an irradiation direction.

  In the vehicular lamp configured as described above, it is desirable that the shape of the reflecting member is a shape corresponding to the shape of the light guide in the longitudinal direction.

  According to the vehicular lamp having such a configuration, since the shape of the reflection member corresponds to the shape of the light guide in the longitudinal direction, for example, if the light guide is a curved curve shape, the reflection member is also used. The curved shape is the same, and the distance between the light guide and the reflecting member can be kept constant. Thereby, even if the light guide has a curved shape, highly accurate light distribution control is possible. Moreover, since a reflecting member can be arrange | positioned corresponding to a lamp design, the vehicle lamp with a favorable appearance can be obtained.

  In the vehicular lamp configured as described above, the first step and the second step include a plurality of triangular steps, and the inclination angle of the reflecting surface on the second step side corresponds to that on the first step side. It is desirable that the angle is determined by the emission angle of the emitted light emitted from the emission surface toward the reflecting member and the incident angle at which the reflected light from the reflecting member enters the incident surface on the first step side.

According to the vehicular lamp having such a configuration, the reflection of the reflection member is determined by the emission angle of the emitted light emitted from the light guide toward the reflection member and the incident angle incident on the light guide from the reflection member. The inclination angle of the surface is determined.
Specifically, the vertical line perpendicular to the bisector of the intersection angle formed at the virtual intersection of the reflected light with the incident angle set on the light guide side and the emitted light with the assumed outgoing angle is the reflection surface. It becomes an inclination angle. Thereby, light distribution control with higher accuracy is possible.

  According to the vehicular lamp according to the present invention, the reflecting member disposed in the vicinity of the rear surface of the light guide and along the light guide guides the emitted light emitted backward from the rear surface of the light guide. The first step has a second step that reflects toward the first step. Thereby, the light from the rear surface of the light guide is returned to the light guide and the light distribution is reliably controlled in the irradiation direction, whereby the light from the light source can be efficiently emitted.

It is a front view of the vehicular lamp which shows one embodiment concerning the present invention. It is the sectional view on the AA line of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 4 is an enlarged view of a main part of FIG. 3, and is an explanatory diagram illustrating a procedure for determining an inclination angle of a reflecting surface of a reflecting member. It is a principal part enlarged view of the vehicle lamp which shows another embodiment which concerns on this invention.

  Hereinafter, one embodiment of a vehicular lamp according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, a vehicular lamp 10 according to a first embodiment of the present invention includes a resin lamp body 11 that is fixed to a vehicle body in a shape that is open on the vehicle rear side, and a lamp body 11. It is suitable for a marker lamp such as a position lamp or a tail and stop lamp having a red transparent or colorless transparent front cover 12 attached to the opening.

  The vehicular lamp 10 forms, for example, a stop lamp light distribution in a lamp chamber 13 defined by a lamp body 11 and a front cover 12 by a bulb 14 and a reflector 15 arranged at the center. Further, three strip-shaped light guides 20 arranged in a U shape in front view along the front cover 12, and a fixing member 16 attached in the vicinity of both rear surfaces of the light guide 20. And four LED light sources 17. The LED light source 17 and the light guide 20 form a tail lamp light distribution, for example. An extension 18 is disposed around the opening of the lamp body 11.

  In the vicinity of the rear surface side of the light guide 20, the reflecting member 30 is disposed with a predetermined interval. The shape of the reflecting member 30 is a curved shape corresponding to the shape of the curved light guide 20 in the longitudinal direction. The material of the reflecting member 30 is an integrally molded product of aluminum material, but an aluminum vapor deposition film or the like may be formed on a substrate made of a polymer material or the like.

  As shown in FIG. 3, the light guide 20 includes an incident surface 21 on one end side in the vicinity of the LED light source 17, a light guide portion 22 that is curved in the other end direction along the front cover 12, and the light guide. A triangular first diffusion step 24 that is disposed on the rear surface side of the unit 22 and internally reflects the light α2 of the LED light source 17 from the front surface 23 side of the light guide unit 22 toward the irradiation direction 27 of the front of the vehicle. ing. The single unit of the first diffusion step 24 includes a first step surface 25 that is an incident surface on which the outgoing light α1 is incident and an outgoing surface 26 from which the outgoing light α1 is emitted.

  The reflecting member 30 is disposed in the vicinity of the rear surface of the light guide 20 and at a constant interval 28 so as to correspond to the shape of the curved light guide 22, and is emitted backward from the rear surface of the light guide 22. It has a triangular second diffusion step 31 that reflects the emitted light α1 toward the first diffusion step 24 of the light guide 20 on the front surface. The second diffusion step 31 has a second step surface 32 that is a reflection surface that reflects the emitted light α1. The pitch of the second diffusion step 31 is set in a range of 0.5 to 2 times the pitch of the first diffusion step 24. Moreover, as for the space | interval 28 of the light guide 20 and the reflection member 30, about 1 mm-7 mm are desirable, for example.

  The light α0 of the LED light source 17 incident from the incident surface 21 is totally reflected by the front surface 23 and guided toward the other end. The light α1 of the LED light source 17 is emitted from the emission surface 26 of the first diffusion step 24, and is totally reflected in the direction of the light guide section 22 by the second step surface 32 of the second diffusion step 31 on the reflection member 30 side. Then, the light enters from the first step surface 25 of the first diffusion step 24 and is internally reflected by the adjacent emission surface 26 and then emitted from the front surface 23 as the emitted light α2 toward the irradiation direction 27 on the front of the vehicle.

  Next, a procedure for determining the inclination angle of the second step surface 32 of the reflecting member 30 will be described with reference to FIG.

  As shown in FIG. 4, the inclination angle θ2 of the second step surface 32 that is the reflection surface on the second diffusion step 31 side is determined from the emission angle β1 of the outgoing light α3 and the incident angle β2 of the reflected light α1. The outgoing angle β1 of the outgoing light α3 is incident from the incident surface 21 of the light guide 20 and guided through the light guide 22, and is internally reflected by the front surface 23 and reflected from the outgoing surface 26 (point C in the figure). This is a so-called exit angle of exiting light emitted toward the member 30.

  The incident angle β2 of the reflected light α1 is the first incident surface on the first diffusion step 24 side where the reflected light α1 is emitted from the emission surface 26 of the light guide 20 and reflected by the second step surface 32 of the reflecting member 30. The incident angle is incident on one step surface 25 (point B in the figure). The reference lines for the emission angle β1, the incident angle β2, and the inclination angle θ2 are the front surface 23 of the light guide 20.

  Specifically, it is formed at a virtual intersection of the reflected light α1 having the incident angle β2 set on the light guide 20 side and the virtual line 33 obtained by translating the outgoing light α3 having the assumed emission angle β1 to the point D. A perpendicular line perpendicular to the bisector 34 of the intersection angle 2θ1 is the inclination angle θ2 of the second step surface 32 which is a reflection surface. Thereby, the reflected light α1 from the reflecting member 30 can be emitted from the front surface 23 as the emitted light α2 toward the irradiation direction 27 on the front surface of the vehicle, and high-precision light distribution control can be realized.

  According to the vehicle lamp 10 of the present embodiment described above, the light guide 20 having the first diffusion step 24 on the rear surface and the second diffusion step 31 on the front surface are disposed in the vicinity of the rear surface side of the light guide 20. And a reflecting member 30. Thereby, the leaking light α1 leaked from the rear surface side of the light guide 20 can be reflected by the second diffusion step 31 of the reflection member 30 and returned from the first diffusion step 24 into the light guide 20 again. Therefore, the light can be efficiently emitted from the front surface 23 of the light guide 20 and the light distribution can be controlled with high accuracy toward the irradiation direction 27 on the front surface of the vehicle.

  Further, since the shape of the reflection member 30 corresponds to the shape of the light guide 20 in the longitudinal direction, for example, if the light guide 20 is a curved curve shape, the reflection member 30 also has the same curve shape and is guided. The interval 28 between the light body 20 and the reflecting member 30 can be kept constant. Thereby, even if the light guide 20 is curved, highly accurate light distribution control is possible. Moreover, since the reflecting member 30 can be arrange | positioned corresponding to a lamp design, the vehicle lamp with a favorable appearance can be obtained.

  Further, the reflection surface of the reflection member 30 is defined by the emission angle β1 of the emitted light α3 emitted from the light guide 20 toward the reflection member 30 and the incident angle β2 incident on the light guide 20 from the reflection member 30. The inclination angle θ2 of the second step surface 32 can be determined. Thereby, light distribution control with higher accuracy is possible.

  Next, another embodiment of the vehicular lamp according to the present invention will be described with reference to FIG. In this embodiment, the configuration of the light guide is the same as that of the above embodiment, but the configuration of the reflecting member is different. In addition, about the part of the same or similar structure as the said embodiment, description of a structure and an effect is abbreviate | omitted by attaching | subjecting the same code | symbol or a similar code | symbol.

  As shown in FIG. 5, the reflecting member 40 of the vehicle lamp according to the present embodiment has a second step surface 42 of the second diffusing step 41 different from the inclination angle θ2 of the second step surface 32 of the reflecting member 30. The inclination angle is formed in the opposite direction. That is, the irradiation direction of the light guide 20 is not the front direction of the vehicle, but is a viewing angle direction that is applied to a headlamp frame material such as a light bezel and irradiates the sidewalk. The method for determining the inclination angle of the second step surface 42 of the reflecting member 40 is the same as the procedure of the above embodiment.

  According to the reflecting member 40 of the present embodiment, the light α0 of the LED light source 17 incident from the incident surface 21 is totally reflected by the front surface 23 and guided toward the other end. Further, the light α1 of the LED light source 17 is emitted from the emission surface 26 of the first diffusion step 24, and is totally reflected in the direction of the light guide section 22 by the second step surface 42 of the second diffusion step 41 on the reflection member 40 side. And after entering from the 1st step surface 25 of the 1st spreading | diffusion step 24 and reflecting internally by the adjacent output surface 26, it is emitted light (alpha) 2 toward the irradiation direction 29 which is a visual angle direction different from a vehicle front direction. As shown in FIG.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 10 ... Vehicle lamp 11 ... Lamp body 12 ... Front cover 17 ... LED light source 18 ... Extension 20 ... Light guide 21 ... Incident surface 22 ... Light guide part 23 ... Front 24 ... 1st spreading | diffusion step 25 ... 1st step surface ( Incident surface)
26 ... Outgoing surface 27 ... Irradiation direction (front of vehicle)
28 ... Interval 29 ... Irradiation direction (viewing angle)
30, 40 ... reflective member 31, 41 ... second diffusion step 32, 42 ... second step surface (reflective surface)

Claims (3)

A light source;
The light source is disposed along the optical axis direction of the light source, has an incident part in the vicinity of the light source, and is formed on the rear surface of the light guide part for guiding incident light that has entered from the incident part, A first step of internally reflecting the incident light from the front surface of the light guide portion toward the irradiation direction;
A light source disposed near the rear surface of the light guide and along the light guide, and reflects the emitted light emitted rearward from the rear surface of the light guide toward the first step of the light guide. A reflective member having two steps on the front surface;
A vehicular lamp characterized by comprising:   2. The vehicular lamp according to claim 1, wherein a shape of the reflecting member is a shape corresponding to a shape of the light guide in a longitudinal direction. The first step and the second step comprise a plurality of triangular steps,
The inclination angle of the reflection surface on the second step side is an emission angle of emission light emitted from the corresponding emission surface on the first step side toward the reflection member, and
The vehicular lamp according to claim 1, wherein the reflected light from the reflecting member is determined by an incident angle at which the reflected light is incident on the incident surface on the first step side.

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