JPH03179604A - Lighting apparatus for automobile - Google Patents

Abstract

PURPOSE:To equalize the light distribution of the irradiation light ejected from a front lens by forming curved faces of the same mounting height whose radius is gradually enlarged as they are closer to the side part of a reflector, as diffusion steps, in series, on a rotational parabolic curved surface, and by providing a shining process on the surface of the diffusion step. CONSTITUTION:A plurality of projected diffusion steps 4 are formed in series at the same mounting height, in such a manner that the radius R of the curved face of each projected diffusion step is gradually enlarged as it is closer to the side part of a reflector, on a rotational parabolic curved surface 3, while a shining process is provided on the surface of the projected diffusion step 4. The diffusion angle of each diffusion step 4 of a reflector 1 is almost of the same, and the light distribution to a front lens 8 obtained by the diffusion step 4 is equalized. The light distribution characteristic to the fore part of the front lens can be improved thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a reflector for a vehicular lamp, and particularly to a vehicular lamp having a reflector with a diffusion step formed on its inner surface.

[Conventional technology]

Conventionally, as shown in FIG.
A reflector 53 is formed, and a lighting light source 54 is disposed in front of the reflector 53, and the light source 5
A vehicle lamp is often used in which a front lens 56 is integrally or integrally attached to the front of a lamp chamber 55 containing a light chamber 55 to form a sealed lamp device (for example, see Utility Model Application No. 77803/1983). .

[Problem to be solved by the invention]

However, in the vehicle lamp having the above configuration, since the reflector 53 is simply formed with a large number of uneven surfaces 52, 52, etc. on the inner surface of the housing portion 51, the irradiated light from the light source 54 is Effective for the front lens 56,
Moreover, the light distribution cannot be controlled accurately, and it is not only difficult to form an appropriate light distribution pattern required for a vehicle lamp, but also it is difficult to form an optical relationship between each uneven surface 52 and the light source 54, and it is difficult to form a uniform light distribution pattern. However, there was a problem in that the appearance of the lamp was poor because a suitable light distribution could not be obtained.

The present invention was devised in view of the above problems, and provides a vehicle lamp in which the diffusion angle of the diffusion step is constant, enabling uniform light distribution to the front lens, and improving the appearance from the front lens. The purpose is to

[Means to solve the problem]

In order to achieve the above object, the reflector of the reflective type lamp according to the present invention is provided with a light source for lighting in a lamp body that integrally forms a reflector forming a paraboloid of revolution, and a light source for lighting is provided in front of the light source. In a vehicle lamp in which a front lens is covered to form a light chamber, a large number of convex diffusion steps are formed at the same height on the parabolic surface of revolution, and the radius R of each convex diffusion step is on the side of the reflector. The curved surfaces that gradually become larger toward the front lens are formed in parallel so that they are visible at approximately equal intervals when viewed from the front of the front lens, and the surface of the convex diffusion step is subjected to a brightening treatment. .

Furthermore, a large number of diffusion steps are formed on the inner surface of the front lens, which are perpendicular to the direction in which the convex diffusion steps of the reflector are formed, so that an appropriate light distribution pattern for a vehicle lamp can be formed.

[Effect]

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 characteristics in front of the front lens are improved.

〔Example〕

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

1 to 4 show an embodiment in which the vehicle lamp according to the present invention is configured as a brake light, direction indicator light, etc., where l is a cylindrical lamp body that is approximately rectangular toward the front. The reflector 1 is a reflector that forms a parabolic curved surface 3 of revolution with a focal point F on its inner surface, and has a large number of convex cylindrical diffusion steps 4 extending in the vertical direction V on its inner surface. ... are arranged in parallel along the plane of the paraboloid of revolution 3, attached to a socket 5 fixed at the axis f position of the reflector 1, and of a lighting light source 6 arranged so as to be located at the focal point F. The structure is such that the irradiated light is diffused in the horizontal direction in front of the reflector 1. These many diffusion steps 4.4... have the same formation height h with respect to the paraboloid of revolution surface 3 of the reflector 1, and the radius R1, R2-Rn is from the inside (center) of the reflector l to the outside. (Side) (Arrow A
(R1<R2~<Rn) $7. vinegar,
As shown in FIG. 5, pitches P1, R2 to Pn in the lateral direction H when viewed from the front of the lamp appear uniformly (P1=P2
=Pn), and the surface is subjected to brightening treatment 7 by aluminum vapor deposition or the like.

Therefore, the diffusion surface of each diffusion step 4 formed of a curved surface faces the light source 6 disposed at the focal point F position of the parabolic surface of revolution 3 of the reflector l at the same level, and the diffusion angle α is constant.

Reference numeral 8 denotes a front lens that is fixed to the front end of the lamp body 2 and forms a lamp chamber 9 that accommodates the light source 6. perpendicular to the formation direction of the diffusion step 4.4...
A large number of convex cylindrical light diffusion diffusion steps 10, 10 extending in the horizontal direction H are arranged in parallel in the vertical direction V at approximately equal pitches.

Therefore, the radii R1, R2-Rn of the curved surfaces of the convex diffusion steps 4.4 formed on the reflector 1 are gradually increased from the inside to the outside of the reflector 1 (R1<R2-<R
n), and the diffusion angle α of the beam of light projected from the light source 6 in the diffusion step 4.4 is made substantially constant, so that the light distribution to the front lens 8 is uniform. becomes.

In the above embodiment, the diffusion steps 10.10... formed on the inner surface of the front lens 8 have been described as having a convex cylindrical shape. The same effect can be achieved even if the shape is concave, and furthermore, it is possible to create a structure that does not necessarily require the diffusion stamps 10, 10, etc. on the front lens 8 side. .

[Effects of the Invention] Since the vehicle lamp according to the present invention is configured as described above,
The convex diffusion step formed on the reflector having a parabolic surface of revolution keeps the diffusion angle of the projected light flux almost constant, making the distribution of the irradiated light emitted from the front lens uniform, and as a result, improving the appearance of the lamp. be able to.

In addition, when implementing the vehicle lamp according to the present invention in various types of taillights that require a substantially rectangular light distribution pattern in front of the lamp, the diffusion angle in the lateral direction in front of the front lens can be adjusted to reflect the diffusion angle of the reflector. Since it can be formed by stamping, the load on the front lens is reduced, and even in a lamp that has a front lens with a large slant angle, a predetermined light distribution pattern can be achieved with a structure in which the front lens has a small diffusion angle. This has excellent effects such as improving design freedom and moldability of vehicle lamps.

[Brief explanation 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, Fig. 3 is a longitudinal sectional view, and Fig. 4 is an enlarged sectional view of the main part of the reflector. FIG. 5 is an explanatory diagram 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 reflective lamp.

Claims (2)

[Claims] (1) A vehicle lamp in which a light source for lighting is provided in a lamp body formed by integrally molding a reflector forming a paraboloid of revolution, and a front lens covers the front of the light source to form a light chamber. On the curved surface of the object, a large number of convex diffusion steps are formed at the same height, and the radius R of each convex diffusion step gradually increases toward the side of the reflector, so that the front lens is approximately equal in height when viewed from the front. A vehicular lamp characterized in that the convex diffusion steps are arranged in parallel so as to be visually recognized at intervals, and the surfaces of the convex diffusion steps are subjected to a brightening treatment. (2) The vehicular lamp according to claim 1, wherein a large number of diffusion steps are formed on the inner surface of the front lens in a direction perpendicular to a direction in which the convex diffusion steps of the reflector are formed.