JPS61225701A - Lamp apparatus for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a vehicular lamp, and particularly to a vehicular signal lamp that utilizes reflected light from a reflector.

[Background of the invention]

In a vehicle lamp in which light emitted from a light source is reflected by a reflector, it is known to use a multistage reflector in order to reduce the height of the reflector, in other words, the thickness of the lamp. FIG. 4 shows such a conventional example, where 1 is a front lens equipped with a fisheye prism la, 2 is a housing, and the inner surface thereof has a plurality of reflective surfaces 2-0.2-1.
2-2...2n are arranged in multiple stages, and the reflecting surface emits the light from the light source 3 arranged so that the filaments are located near a common focal point as almost parallel light. It is formed into a conical shape centered at the focal point position.

However, in the conventional vehicle lighting device as described above, each of the reflecting surfaces has a conical shape as described above, so that the light is reflected from each reflecting surface 2-0.2-1.2-2...2-n. The light directed toward the lens 1 is approximately parallel rays, and the closer the reflective surface segment is to the light source, the higher the incident light flux density is, and the further away from the light source, the lower the light flux density is. That is, as shown in FIG. 5, the angle of incidence O for the reflective surface segment located near the light source is larger than the angle of incidence α for the reflective surface segment located far from the light source, so the lens brightness in the portion close to the light source is high. There is a problem in that the lens becomes darker as the distance increases, and the brightness of the lens surface becomes uneven, which is unfavorable in terms of visibility.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to improve the problems of the prior art as described above, and to provide a vehicle lamp with good visibility in which the density of reflected light incident on each part of the front lens is substantially uniform.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention makes at least a plurality of reflecting surfaces close to the light source out of the plurality of reflecting surfaces have a convex curvature shape, and the curvature increases from the center of the reflector to the outside. Sequentially larger shi, this causes
The reflecting surface near the light source is characterized by increasing the diffusion width of the reflected light, thereby making the density of the reflected light incident on each part of the front lens almost uniform.

[Embodiments of the Invention] Hereinafter, the present invention will be explained in detail based on FIGS. 1 to 3.

In Figures 1 and 2, 1 is a lens.

A fisheye prism 1a is provided on its inner surface. 2 is a housing which has a plurality of reflective surfaces 2R-0゜2R- on its inner surface.
1, 2R-2, -2R-n), and its reflecting surface has a curvature of <Rx (R-0, R-1, R-2°R-n) as shown in FIG. 3, R...n)
The surface has a convex curvature.

Then, the value of Rx (R-0, R-1, R-2...
R-n) is set so that the reflective surface near the light source 3 is small and becomes larger toward the outer periphery.

FIG. 2 is an explanatory diagram showing the path of light and the state of diffusion of the vehicular lamp constructed as described above. As shown in the figure, from the light source 3 to the reflective surfaces 2R-0, 2R-1゜2R-2, 2R-
The light incident on 3-.-2R-n is diffused by the curvature Rx formed on each reflecting surface and enters the lens 1 as reflected light having a diffusion width θ□ or αL. At this time,
As mentioned above, the luminous flux density incident on the reflector section from the light source 3 increases as it approaches the light source, and decreases as it approaches the periphery; however, in the present invention, the curvature of each reflective surface is gradually increased from the center of the reflector toward the outside. Therefore, the diffusion width θH of the reflective surface near the center is large, and the diffusion width αL of the reflective surface on the peripheral side is small, and thus the value of Rx (R-0, R-1, R-2, · ... R-n) to each reflective surface segment (2R-0, 2R-1, 2R-2,
-2R-n) by taking into consideration the density of the light flux incident on the lens surface, the density of the reflected light incident on the lens surface during lighting can be adjusted, and the brightness of the lens surface can be made almost uniform. Therefore, according to the present invention, it is possible to provide a lamp with good visibility by reducing the tendency for glare on the lens surface near the light source unlike in conventional lamps.

FIG. 3 shows an example in which the present invention is applied when there is not enough light for the entire lamp. That is, if all the reflecting surfaces are given the curvature Rx as in the above embodiment, there is a risk that the light distribution standard cannot be satisfied if there is not enough light in the entire lamp. In such a case, a reflective surface with curvature Rx is formed only in the part of the reflective surface close to the light source 3 (where the incident luminous flux density is high), and the reflective surface in the part far from the light source is similar to the reflective surface shown in Fig. 4. The conical reflecting surface 2x is assumed to be 2x. In this way, the reflected light incident on the lens 1 from the reflective surface having the curvature Rx is diffused as shown in θ11 to suppress the occurrence of glare, and the reflected light α from the conical reflective surface 2x is almost parallel as shown in the figure. Therefore, the light distribution standard in the surrounding area can be satisfied.

〔Effect of the invention〕

As described above, according to the present invention, the reflective surface of the multi-stage reflector is made into a convex curvature shape, and the curvature is gradually increased from the center of the reflector to the outside, thereby making the entire surface of the lens substantially uniform. This has the effect of improving visibility by making it shine.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the implementation of the vehicle lamp of the present invention;
FIG. 2 is an explanatory diagram showing the path and diffusion state of the light in FIG. 1. FIG. 3 is an explanatory diagram similar to FIG. 2 showing another embodiment. FIG. 4 is a sectional view of a conventional lamp, and FIG. 5 is an explanatory diagram showing the path of light. DESCRIPTION OF SYMBOLS 1...Front lens, 2...Housing, 2R-0°2R-1, 2R-2...2R-n...Multi-stage reflective surface having a convex curvature shape, Rx(R-0,R- 1, R-2・-
R-n)...Curvature, 3...Light source.

Claims (1)

[Claims] A vehicular lamp comprising a reflector in which a plurality of reflective surfaces are arranged in multiple stages, a lens provided in a front opening of the reflector, and a light source installed at approximately a focal point of each of the reflectors, wherein the plurality of reflective surfaces A vehicular lamp characterized in that at least a plurality of reflecting surfaces near the light source have a convex curvature shape, and the curvature gradually increases from the center of the reflector to the outside.