JP5883109B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp.

  Conventionally, as a vehicular lamp such as an automobile headlamp, one that emits light from the front surface of a light guide plate by light incident from an end surface of the light guide plate (lens) is known, as described in Patent Documents 1 and 2, for example. Yes.

  In the vehicular lamp described in Patent Documents 1 and 2, a light guide plate having a reflective structure such as a reflective dot is used on the rear surface, and light incident from the lower surface of the light guide plate is reflected by the rear reflective structure from the front surface. By emitting the light, the front surface of the light guide plate is caused to emit light.

JP 2010-21001 A JP 2008-186786 A

  However, in the vehicular lamp described in Patent Documents 1 and 2, the light incident on the light guide plate from the lower surface is controlled only in the front-rear direction and not in the left-right direction. Cannot emit light with a wide width on the front side. Therefore, when trying to emit light widely on the front surface of the light guide plate that is long in the left-right direction, a large number of light sources must be arranged along the left-right direction, resulting in increased component costs.

  In the vehicular lamp described in Patent Documents 1 and 2, since the front surface of the light guide plate is caused to emit light by the light simply reflected by the reflection structure provided on the rear surface of the light guide plate, Luminance unevenness corresponding to the distance from the light source occurs such that a portion near the light source emits light more strongly, and the front surface of the light guide plate cannot be uniformly emitted. In particular, when a plurality of reflective dots are formed on the rear surface of the light guide plate as a reflective structure, the distance from the light source is emitted more strongly than the other portions through the front surface of the light guide plate. In addition to the above-described luminance unevenness depending on the brightness unevenness depending on the distance from the reflective dot also occurs.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the vehicle lamp which can light-emit a long area | region more uniformly compared with the past.

In order to solve the above-mentioned problem, the invention described in claim 1
A light source;
An incident surface on which light emitted from the light source is incident while being refracted in the optical axis direction of the light source, an internal reflection surface that internally reflects light incident from the incident surface, and light internally reflected by the internal reflection surface a light guide portion having an exit surface for emitting a
A reflective member having a diffusely reflecting surface for diffusing and reflecting light emitted from the exit surface of the light guide unit,
A diffusion unit for further diffusing the light diffusely reflected by the diffuse reflection surface;
Extension,
In a vehicle lamp comprising:
The light guide portion,
The emission surface is formed in a long shape along a predetermined longitudinal direction,
A plurality of the internal reflection surfaces are arranged in parallel along the longitudinal direction on the surface of the light guide portion opposite to the emission surface,
The diffuse reflection surface of the reflection member includes a first reflection surface and a second reflection surface that are each formed in a long shape along the longitudinal direction.
The first reflecting surface is provided at a position for reflecting light emitted from the emitting surface of the light guide unit toward the second reflecting surface;
The second reflecting surface is formed in a curved shape that is curved more than the first reflecting surface, and is provided at a position that reflects the light reflected by the first reflecting surface toward the diffusing portion. ,
Wherein the first at least one of the reflecting surface and the second reflecting surface of is intended to diffuse reflecting light,
The diffusing portion is disposed so as to cover the front of the second reflecting surface and is elongated along the longitudinal direction, and diffuses light transmitted through the diffusing portion ,
The extension is arranged so as to cover the front of the light source so that the light source is not visible from the outside of the vehicle lamp ,
The light guide part and the diffusion part are integrally formed .

The invention according to claim 2 is the vehicle lamp according to claim 1,
The first reflecting surface and the second reflecting surface may be surfaces painted white or colored with white as a raw material.

The invention according to claim 3 is the vehicle lamp according to claim 1 or 2,
The light source comprises a light emitting diode;
The light guide is characterized by having a plurality of said entrance surface for entering the light emitted from the plurality of the light emitting diode to the light guide portion.

  According to the present invention, the light emitted from the light guide lens is diffusely reflected by the long diffuse reflection surface (the first reflection surface and the second reflection surface) along the longitudinal direction of the light guide lens. Therefore, unlike conventional vehicular lamps where the front surface of the lens (light guide plate) is caused to emit light by simply reflecting light with a reflective structure such as a reflective dot, uneven brightness occurs according to the distance from the light source or the reflective dot. The luminance unevenness can be alleviated or a long region along the longitudinal direction can be emitted more uniformly.

It is a disassembled perspective view of the vehicle lamp in embodiment. It is a front view of the vehicular lamp in an embodiment. It is sectional drawing in the III-III line of FIG. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG. It is sectional drawing in the VI-VI line of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a vehicular lamp 1 in the present embodiment, FIG. 2 is a front view of the vehicular lamp 1, and FIGS. 3 to 6 are III-III to VI- lines in FIG. It is each sectional drawing in VI line.
In addition, although the vehicle lamp in this embodiment is a rear lamp each mounted on the rear left and right of the vehicle (not shown), only the vehicle lamp 1 mounted on the rear left side of the vehicle will be described below. Further, in the following description, unless otherwise specified, “up”, “down”, “front”, “rear”, “left”, “right”, “inside”, “outside” are indicated in the direction viewed from the vehicular lamp 1. As used, it is used in correspondence with the description in the drawings.

As shown in FIG. 1, the vehicular lamp 1 includes a housing 2 whose front surface is open. The front opening of the housing 2 has an upper side inclined obliquely right rearward, a front lower side substantially along the left-right direction, a right lower side inclined slightly rearward from the right end of the front lower side, and substantially along the vertical direction. And a right side connecting the rear ends of the upper side and the lower right side.
The periphery of the housing 2 (the periphery of the front opening) is bent forward as shown in FIGS. 3 to 5, and the front surface inside the bent portion constitutes the first diffuse reflection surface 21, The front surface constitutes the second diffuse reflection surface 22. The first diffuse reflection surface 21 is formed in a planar shape inclined outward, and the second diffuse reflection surface 22 is formed in a curved shape curved forward, both of which are surfaces for diffusely reflecting light. The surface is white coated as a treatment. Note that the first diffuse reflection surface 21 and the second diffuse reflection surface 22 may be surfaces that are colored white instead of being painted white.

  As shown in FIG. 1, an outer lens 3 that covers the front opening of the housing 2 is disposed in front of the housing 2. The outer lens 3 is a transparent translucent member and is formed in a peripheral shape along the periphery of the housing 2. In the lamp chamber formed by the outer lens 3 and the housing 2, a plurality of light sources 4,... (See FIG. 2), an inner lens 5, and an extension 6 are accommodated.

  Among these, the light sources 4 are light emitters such as light emitting diodes, for example, and as shown in FIG. 2, along the upper side, the front lower side, the right lower side, and the right side of the outer lens 3 (housing 2). They are arranged at predetermined intervals. 3 to 6, the light sources 4 are mounted on the substrate 41 with the optical axis Ax (light source optical axis) directed in a direction orthogonal to the direction in which the light sources 4 are arranged. The first diffuse reflection surface 21 is disposed at a position facing it. Specifically, among the light sources 4,... Arranged along the front lower side of the periphery of the housing 2 are arranged in front of the first diffuse reflection surface 21 with the optical axis Ax directed rearward, and the housing Those arranged along the upper side, the lower right side, and the right side of the peripheral edge of 2 are arranged on the right front side of the first diffuse reflection surface 21 with the optical axis Ax directed to the left rear side.

As shown in FIG. 1, the inner lens 5 is elongated along the upper side, the front lower side, the right lower side, and the right side of the peripheral edge of the housing 2, that is, along the arrangement direction of the light sources 4,. It is a translucent member that is formed in a scale and is substantially U-shaped in front view, and has a light guide part 51 and a diffusion part 52.
Among these, as shown in FIG. 6, the light guide 51 is formed to be long over the entire length of the inner lens 5, and the direction along the optical axis Ax with respect to the light sources 4. It is arranged in the direction; the rear in FIG. The light guide section 51 is formed in a shape in which a plurality of light guide blocks 510 corresponding to the plurality of light sources 4 are connected in the longitudinal direction X (substantially left-right direction in FIG. 6).

The light guide blocks 510,... Have a long shape with the position of the corresponding light source 4 as the center in the longitudinal direction X and the substantially intermediate position between the light source 4 and the light source 4 adjacent thereto as an end in the longitudinal direction X. Is formed. The light guide block 510,... Has an incident surface 511, a pair of first reflecting surfaces 512, 512, a plurality of second reflecting surfaces 513,.
The incident surface 511 is a convex surface (aspherical surface) projecting at a position facing the corresponding light source 4, and is disposed so that the light source 4 is located at the focal point thereof. The light enters the light guide block 510 while being refracted in the direction of the optical axis Ax.
The first reflecting surfaces 512 and 512 are recessed with a pair on the surface opposite to the incident surface 511 so as to be positioned in the optical axis Ax direction of the incident surface 511. Specifically, the first reflecting surfaces 512 and 512 are inclined to both sides in the longitudinal direction X with a point on the optical axis Ax as a bending point, and light incident on the light guide block 510 from the incident surface 511. Are internally reflected so as to branch to both sides in the longitudinal direction X with the optical axis Ax as a boundary.
A plurality of second reflecting surfaces 513,... Are formed on both sides in the longitudinal direction X of the incident surface 511, and the distance from the light source 4 facing the incident surface 511 in the longitudinal direction X is positioned in the optical axis Ax direction. Are arranged in such a manner as to form stepped surfaces alternately connected in the longitudinal direction X with step surfaces connecting between them. The second reflecting surfaces 513,... Are located on both sides of the first reflecting surfaces 512, 512 in the longitudinal direction X, and the first reflecting surface 512, which is closer to the pair of first reflecting surfaces 512, 512, The light beams are formed so as to be parallel to each other, and the light beams branched and internally reflected by the first reflection surfaces 512 and 512 to both sides in the longitudinal direction X are individually internally reflected in the optical axis Ax direction.
The emission surfaces 514 are arranged on both sides of the first reflection surfaces 512 and 512 in the longitudinal direction X so as to be positioned in the optical axis Ax direction of the second reflection surfaces 513,. Has been. This emission surface 514 emits the light internally reflected in the optical axis Ax direction by the second reflection surfaces 513,... From the light guide block 510.

  On the other hand, as shown in FIGS. 3 to 5, the diffusing unit 52 is disposed so as to cover the front of the second diffusive reflecting surface 22, and extends to the outer end of the light guide unit 51 over the entire length of the inner lens 5. It is connected. The diffusing portion 52 is formed in a curved plate shape that gently curves backward, and textured processing for diffusing light transmitted through the diffusing portion 52 is applied to both front and rear surfaces.

  The extension 6 is disposed so as to cover the front of the light sources 4... While exposing the diffusing portion 52 of the inner lens 5. The extension 6 covers and hides the light sources 4 through the outer lens 3 so that the light sources 4 cannot be seen from the outside.

In the vehicular lamp 1 having the above configuration, as shown in FIG. 6, the light emitted radially from the light source 4, centered on the optical axis Ax direction, corresponds to the light guide 51 of the inner lens 5. The light is incident on the light guide block 510 while being refracted in the optical axis Ax direction by the incident surface 511 of the light guide block 510. The light is internally reflected while being branched to both sides in the longitudinal direction X with the optical axis Ax as a boundary by the pair of first reflecting surfaces 512 and 512, and then intermittently distributed in the longitudinal direction X. Are dispersed in the longitudinal direction X and individually internally reflected in the direction of the optical axis Ax, and are emitted from the light guide block 510 (light guide unit 51) through the emission surface 514.
As shown in FIGS. 3 to 5, the light emitted from the light guide portion 51 of the inner lens 5 is diffusely reflected by the first diffuse reflection surface 21 and again diffusely reflected by the second diffuse reflection surface 22. It goes to the diffusion part 52 of the lens 5. Then, the light is further diffused by the texture processing on both the front and rear surfaces of the diffusing portion 52, passes through the diffusing portion 52, and is then irradiated outward through the outer lens 3.
Thus, a region of the outer lens 3 that faces the diffusion portion 52 of the inner lens 5, that is, a long region along the periphery of the outer lens 3 emits light uniformly.

  According to the vehicular lamp 1 described above, the light emitted from the light sources 4,... In the optical axis Ax direction is guided by the light guide 51 of the inner lens 5 elongated in the arrangement direction of the light sources 4,. The light is emitted in a long area along the longitudinal direction X with a smaller number of light sources 4 than a conventional vehicle lamp that has not controlled light in the longitudinal direction of the lens (light guide plate). Can be made.

  In addition, since the light emitted from the light guide 51 of the inner lens 5 is diffusely reflected by the long first diffusion reflection surface 21 and the second diffusion reflection surface 22 along the longitudinal direction X, the reflection dot or the like Unlike conventional vehicular lamps, where the front surface of the lens (light guide plate) is caused to emit light simply by the light reflected by the reflecting structure, luminance unevenness corresponding to the distance from the light source or the reflective dot does not occur, or the brightness Unevenness can be reduced, and a long region along the longitudinal direction X can be emitted more uniformly.

  Further, since the light diffusely reflected by the first diffuse reflection surface 21 and the second diffuse reflection surface 22 is further diffused by the diffusion portion 52 of the inner lens 5, the long region along the longitudinal direction X is made more uniform. Can emit light.

  Moreover, since the light guide part 51 and the diffusion part 52 are integrally formed as the inner lens 5, the number of parts can be reduced as compared with the case where they are configured separately.

  Moreover, since the elongate area | region along the periphery of the outer lens 3 (vehicle lamp 1) light-emits, the design property at the time of light emission can be made unique and excellent.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the above embodiment, the first diffuse reflection surface 21 and the second diffuse reflection surface 22 are coated with white, but either one of the first diffuse reflection surface 21 and the second diffuse reflection surface 22 is not positive. It is good also as surface treatment, such as aluminum vapor deposition, in order to set it as a reflective surface and to reflect light regularly on the said regular reflective surface. In this case, stronger light can be obtained as compared to the case where white coating is applied to both the first diffuse reflection surface 21 and the second diffuse reflection surface 22. However, in this case, it is possible to obtain more uniform light emission on the light emitting surface when the light is diffusely reflected by the second diffuse reflecting surface 22 closer to the light emitting surface (outer lens 3) than the first diffuse reflecting surface 21. .

  In addition, the light is diffusely reflected by the two surfaces of the first diffuse reflection surface 21 and the second diffuse reflection surface 22, but if the light can be reflected to the diffusion portion 52 of the inner lens 5 while diffusing, the light is diffused. There may be only one reflecting surface.

  Further, the embossing of the diffusing portion 52 of the inner lens 5 does not have to be performed on both the front and rear surfaces, but may be performed on at least one of the front surface and the rear surface. The embossing may be replaced with another method capable of diffusing light. For example, the diffusing unit 52 may be milky white, or a diffusing agent may be mixed in the diffusing unit 52.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 3 Outer lens 4 Light source 5 Inner lens 6 Extension 21 1st diffuse reflection surface 22 2nd diffuse reflection surface 41 Board | substrate 51 Light guide part 52 Diffusion part 510 Light guide block 511 Incident surface 512 1st reflection surface 513 Second reflection surface 514 Output surface Ax Optical axis X Longitudinal direction

Claims (3)

A light source;
An incident surface on which light emitted from the light source is incident while being refracted in the optical axis direction of the light source, an internal reflection surface that internally reflects light incident from the incident surface, and light internally reflected by the internal reflection surface a light guide portion having an exit surface for emitting a
A reflective member having a diffusely reflecting surface for diffusing and reflecting light emitted from the exit surface of the light guide unit,
A diffusion unit for further diffusing the light diffusely reflected by the diffuse reflection surface;
Extension,
In a vehicle lamp comprising:
The light guide portion,
The emission surface is formed in a long shape along a predetermined longitudinal direction,
A plurality of the internal reflection surfaces are arranged in parallel along the longitudinal direction on the surface of the light guide portion opposite to the emission surface,
The diffuse reflection surface of the reflection member includes a first reflection surface and a second reflection surface that are each formed in a long shape along the longitudinal direction.
The first reflecting surface is provided at a position for reflecting light emitted from the emitting surface of the light guide unit toward the second reflecting surface;
The second reflecting surface is formed in a curved shape that is curved more than the first reflecting surface, and is provided at a position that reflects the light reflected by the first reflecting surface toward the diffusing portion. ,
Wherein the first at least one of the reflecting surface and the second reflecting surface of is intended to diffuse reflecting light,
The diffusing portion is disposed so as to cover the front of the second reflecting surface and is elongated along the longitudinal direction, and diffuses light transmitted through the diffusing portion ,
The extension is arranged so as to cover the front of the light source so that the light source is not visible from the outside of the vehicle lamp ,
The vehicular lamp , wherein the light guide unit and the diffusion unit are integrally formed .   2. The vehicular lamp according to claim 1, wherein the first reflection surface and the second reflection surface are surfaces painted in white, or surfaces that are white-colored. The light source comprises a light emitting diode;
The light guide portion, the vehicular lamp according to claim 1 or 2, wherein a plurality of said entrance surface for entering light emitted from the plurality of light emitting diodes in the light guide section.

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