JPH07120483B2 - 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 of a vehicle lamp, and more particularly to a reflective structure of a reflection type lamp which constitutes a reflector on an inner surface of a lamp body.

[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 is simply formed by forming a large number of uneven surfaces 52, 52 ... On the inner surface of the housing portion 51. The light distribution of the light emitted from the light source 54 cannot be effectively and accurately controlled with respect to the front lens 56, which makes it difficult to form an appropriate light distribution pattern required for a vehicular lamp. The optical positional relationship between the light source 54 and the light source 54 is difficult to form, 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, the diffusion angle of the diffusion step formed on the reflector is constant, it enables uniform light distribution to the front lens, and improved the appearance from the front of the front lens. An object of the present invention is to provide a vehicle lighting device.

[Means for Solving the Problems]

In order to achieve the above object, a vehicular lamp according to the present invention is provided with a light source for lighting in a lamp body formed by integrally molding a reflector having a rotation parabolic curved surface, and the front of the light source is covered with a front lens. In a vehicular lamp with a lamp chamber
On the inner surface of the parabolic curved surface, a plurality of convex, cylindrical, and vertically extending diffusion steps have the same forming height, and the curved surface having the same radius R has a uniform pitch along the surface of the parabolic curved surface. In this way, a means for forming parallel formation in the lateral direction and performing bright light treatment on the surface of the convex diffusion step is taken.

In addition, a large number of diffusion steps orthogonal to the forming 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 diffusing surface of each convex diffusing step faces the light source arranged at the focal position of the paraboloid of revolution of the inner surface of the reflector at the same level, and each diffusing angle becomes substantially constant. The light distribution to the front lens obtained by the diffusion step is made uniform, and the light distribution performance 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 backward light, etc.
Is a reflector that is integrally continuous to the rear side of a cylindrical lamp body 2 having a substantially rectangular shape toward the front side and forms a paraboloid of revolution 3 having a focal point F on the inner surface. The inner surface of the reflector 1 is A large number of convex and cylindrical longitudinally extending diffusion steps 4, 4 ... Are arranged side by side along the surface of the parabolic curved surface 3 and attached to a socket 5 fixed at the axial f position of the reflector 1. The illumination light from the light source 6 for lighting arranged so as to be located at the focal point F is diffused in the front horizontal direction of the reflector 1. The multiple diffusion steps 4, 4, ... Have the same forming height h along the parabolic curved surface 3 of the reflector 1 indicated by the arrow A, and have the same radius R.
With a curved surface extending in the vertical direction at an even pitch P,
A bright light treatment 7 such as aluminum vapor deposition is applied to the surface thereof. Therefore, the diffusion surface of each of the diffusion steps 4, 4 formed by the R-shaped steps faces the light source 6 disposed at the focal point F position of the rotation parabolic curved surface 3 on the inner surface of the reflector 1 at the same level, and each diffusion angle Keep α constant.

Reference numeral 8 denotes a front lens which is fixed to the front end portion of the lamp body 2 and constitutes a lamp chamber 9 in which the light source 6 is housed. On the inner surface of the front lens 8, a large number of convex cylindrical diffusing steps extending in the lateral direction H, which are orthogonal to the forming direction of the diffusing steps 4, 4, ... Formed on the inner surface of the reflector 1.
10 and 10 are formed in parallel in the vertical direction V at substantially equal pitches.

Therefore, the light emitted from the light source 6 is diffused by the reflectors 1, 4, ...
A desired light distribution pattern is formed by the synergistic effect of ... And the light is emitted to the outside of the front lens 8 with a uniform light distribution.

In the present invention, the front projection pitches P1, P2 to Pn with respect to the front lens 8 are closer to the sides of the lamp body 2 as shown in FIG.
Corresponding to, it is visually recognized sequentially (P1>P2>to> Pn).

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 exhibited, and further, the front lens 8 side may have a structure that does not necessarily require the diffusion steps 10, 10.

〔The invention's effect〕

Since the vehicular lamp according to the present invention is configured as described above, the divergence angle of the projected light flux due to the convex diffusing step formed on the reflector having the paraboloid of revolution becomes substantially constant, and the irradiation light emitted from the front lens is obtained. The light distribution can be made uniform, and as a result, the appearance of the lamp can be improved.

Further, when the vehicular lamp according to the present invention is embodied as a lamp device such as various taillights in which the light distribution pattern to the front of the lamp needs to be formed in a substantially rectangular shape, the diffusion angle to the front side of the front lens is set to the above-mentioned reflector. Since it can be formed by the diffusion step of the front lens, the load on the front lens is reduced, and even in a lamp including a front lens having a large slant angle, a predetermined light distribution can be obtained by a structure in which the front lens has a small diffusion angle. It is possible to obtain a pattern, and there are excellent operational effects such as improvement in design freedom and moldability of the vehicular lamp.

[Brief description of drawings]

1 is a cross-sectional view of a vehicular lamp according to the present invention, FIG. 2 is a front view in which the same part is cut away, FIG. 3 is the same vertical cross-sectional view, and FIG. 4 is an enlarged cross-sectional view of a main part of a reflector. FIG. 6 is an explanatory view showing the relationship between the curved surface of the reflector and the diffusion step, and FIG. 6 is a transverse sectional view showing 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 comprising a lamp body formed by integrally molding a reflector having a paraboloid of revolution, and a light source for lighting, wherein a front lens is covered with a front lens to form a lamp chamber. On the inner surface of the paraboloid of revolution, a large number of convex, cylindrical, and vertically extending diffusion steps have the same forming height, and with a curved surface of the same radius R, an even pitch is provided along the plane of the paraboloid of revolution. A vehicle lamp characterized in that it is formed in parallel in the lateral direction, 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.