JPH0766686B2 - Vehicle lighting - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a reflector for a vehicular lamp, and more particularly to a vehicular lamp having a reflector having a diffusion step on its inner surface.

[Conventional technology]

Conventionally, as shown in FIG. 6, a reflector 53 having a large number of concave and convex surfaces 52, 52 is formed on the inner surface of a housing portion 51 forming a lamp body 50, and a light source 54 for lighting is provided in front of the reflector 53. And a front lens 56 is integrally or integrally attached in front of a lamp chamber 55 accommodating the light source 54 to form a hermetically sealed lamp device (for example, actual opening 62).
-77803) is often used.

[Problems to be Solved by the Invention] However, in the vehicular lamp having the above-described configuration, the reflector 53 having the large number of uneven surfaces 52, 52 ... Is simply formed on the inner surface of the housing portion 51. The irradiation light of the light source 54 cannot be effectively and accurately controlled with respect to the front lens 56, and it is difficult to form an appropriate light distribution pattern required for a vehicle lamp, and each uneven surface 52 There is a problem in that it is difficult to form an optical confrontation relationship between the light source 54 and the light source 54, and a uniform light distribution cannot be obtained, so that the appearance of the lamp deteriorates.

The present invention has been made in view of the above problems, and provides a vehicular lamp in which the diffusion angle of the diffusion step is constant, uniform light distribution to the front lens is possible, and the appearance from the front lens is improved. The purpose is to do.

[Means for Solving the Problems]

In order to achieve the above object, a reflector of a reflective lamp according to the present invention includes a light source for lighting in a lamp body formed by integrally molding a reflector having a rotation parabolic curved surface, and a front lens in front of the light source. In a vehicular lamp having a lamp chamber covered with, a plurality of convex diffusion steps have the same forming height on the paraboloidal curved surface, and the radius R of each convex diffusion step is directed to the side of the reflector. The front lens is formed in parallel so that the front lens can be visually recognized at substantially equal intervals in front view, and the surface of the convex diffusing step is subjected to a brightening treatment.

In addition, a large number of diffusion steps orthogonal to the formation direction of the convex diffusion steps of the reflector can be formed on the inner surface of the front lens to form a proper light distribution pattern as a vehicle lamp.

[Action]

According to the above configuration, the diffusion angle of each diffusion step of the reflector is substantially constant, the light distribution to the front lens obtained by the diffusion step is made uniform, and the light distribution characteristic to the front of the front lens is improved.

〔Example〕

An embodiment of a vehicular lamp according to the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment in which the vehicular lamp according to the present invention is configured as a brake light, a direction indicator light, etc., 1 is a tubular lamp body 2 having a rectangular shape toward the front side. Is a reflector that is continuous to the rear of the and has a parabolic curved surface 3 having a focal point F on the inner surface thereof. On the inner surface of the reflector 1, a large number of diffusion steps 4, 4 ... Irradiation light from a light source 6 for lighting, which is arranged in parallel along the surface of the parabolic curved surface 3 and is attached to a socket 5 fixed at a position of an axis f of the reflector 1 so as to be positioned at the focal point F. The reflector 1 is configured so as to be diffused in the front horizontal direction. This numerous diffusion steps 4,4
Have the same forming height h with respect to the rotation parabolic curved surface 3 of the reflector 1, and the radii R1, R2 to Rn are from the inner side (center part) of the reflector 1 to the outer side (sideward) (direction of arrow A). As shown in FIG. 5, the pitches P1, P2 to Pn in the horizontal direction H in the front view of the lamp are uniform (P1 = P2 = Pn). And a bright light treatment 7 such as aluminum vapor deposition is applied to the surface thereof. Therefore, the diffusing surface of each diffusing step 4 formed by the curved surface faces the light source 6 disposed at the focal point F position of the paraboloidal curved surface 3 of the reflector 1 at the same level, and the diffusing angle α is constant.

Reference numeral 8 denotes a front lens fixed to the front end of the lamp body 2 to form a lamp chamber 9 accommodating the light source 6. The front lens 8 is formed on the inner surface of the reflector 1 on the inner surface. A large number of convex cylindrical diffusion steps 10, 10 ... For light diffusion orthogonal to the forming direction of the diffusion steps 4, 4 ... And extending in the horizontal direction H are formed in parallel in the vertical direction V at substantially equal pitches.

Therefore, the convex diffusion step formed on the reflector 1
The radii R1, R2 to Rn of the curved surfaces of 4, 4, ... Are sequentially increased from the inside of the reflector 1 to the outside (R1 <R2 ... Since the diffusion angle α of the projected light flux L is substantially constant, the light distribution to the front lens 8 is uniform.

Although the diffusion steps 10, 10 ... Formed on the inner surface of the front lens 8 have been described in the above-mentioned embodiment in the form of a convex cylindrical shape, the shape of each diffusion step 10, 10 ,. Even if it is concave, the same effect is exerted, and further, the front lens 8 side may have a structure in which the diffusion steps 10, 10, ... Are not necessarily required.

〔The invention's effect〕

Since the vehicular lamp according to the present invention is configured as described above,
The convex diffusion step formed on the reflector with a curved parabolic surface makes the diffusion angle of the projected light flux almost constant, and makes the light distribution of the irradiation light emitted from the front lens uniform, thus improving the appearance of the lamp. You can

Further, when the vehicular lamp according to the present invention is applied to various taillights etc. in which the light distribution pattern toward the front of the lamp needs to be formed in a substantially rectangular shape, the diffusion angle in the front lateral direction of the front lens is set to the diffusion angle of the reflector. Since it can be formed by steps, the load on the front lens is reduced, and even in a lamp that constitutes a front lens having a large slant angle, a predetermined light distribution pattern can be obtained with a structure in which the diffusion angle of the front lens is small. Thus, it is possible to obtain an excellent effect such as improvement in design freedom and moldability of the vehicle lamp.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vehicle lamp according to the present invention, FIG. 2 is a partially cutaway front view of the same, FIG. 3 is a vertical cross-sectional view of the same, and FIG. 4 is an enlarged cross-sectional view of a main part of a reflector. FIG. 5 is an explanatory view showing the relationship between the curved surface of the reflector and the diffusion step, and FIG. 6 is a cross-sectional view of a conventional reflection type lamp. 1 ... Reflector, 3 ... Rotating parabolic curved surface, 4 ... Diffusing step, 6 ... Light source, 8 ... Front lens, 10 ... Diffusing step

Claims (2)

[Claims] 1. A vehicular lamp having a light source for lighting in a lamp body integrally formed with a reflector having a rotational parabolic curved surface, the front of the light source being covered with a front lens to form a lamp chamber. In the front view of the front lens, a curved surface having a large number of convex diffusing steps having the same forming height on the paraboloid of revolution and the radius R of each convex diffusing step gradually increasing toward the side of the reflector. A vehicle lamp characterized in that they are formed in parallel so that they can be visually recognized at substantially equal intervals, and that the surface of the convex diffusion step is subjected to bright light treatment. 2. The vehicular lamp according to claim 1, wherein a plurality of diffusing steps are formed on the inner surface of the front lens, the diffusing steps being orthogonal to the forming direction of the convex diffusing steps of the reflector.