JP2595177Y2 - Vehicle lamp with color cap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp provided with a color cap, and more particularly to a vehicular lamp improved to prevent leakage of white light that does not pass through the color cap.

[0002]

2. Description of the Related Art A vehicle lamp of this type is, for example, a front lamp.
Widely used as turn signal lamps . FIG.
Is a sectional view showing a conventional example of a vehicle lamp having a A members color color cap. The reference numeral 1 denotes a lamp housing, the inner surface of which is formed into a paraboloid of revolution, and a reflecting mirror is formed thereon to form a paraboloid of revolution 1a. A front lens 2 is mounted so as to cover a front opening of the lamp housing 1. Arrow Z is the optical axis of the paraboloid of revolution, and F is its focal position. The above focus position F
The light source bulb 3 is arranged near the filament. An amber transparent color cap (abbreviated as amber cap) 4 is attached to the lamp housing 1 so as to cover the light source bulb 3 so that the light flux emitted from the light source bulb 3 is adjusted to an amber color and projected. Have been. The luminous flux emitted from the light source bulb 3 is reflected by the paraboloid-shaped reflecting surface 1a to become a parallel luminous flux substantially in the optical axis Z direction. The light is transmitted through the amber cap 4 on the way, and is emitted as amber colored light.

[0003]

In the conventional vehicle lamp described with reference to FIG. 2, the lamp housing 1 is usually injection-molded with a synthetic resin material. The amber cap is formed of an amber transparent material. A gap is likely to occur in the contact portion between the amber cap 4 and the lamp housing 1 due to a molding error, distortion after molding, and the like. If there is a gap in this portion, there is a high possibility that white light that does not pass through the amber cap may leak (arrow a). In order to prevent the light leakage described above, it is conceivable to provide a light-blocking ridge 5 drawn by a virtual line. The inventors of the present invention made a prototype of a vehicular lamp provided with the above-described light-blocking ridges 5 and conducted research. As a result, it was confirmed that the vehicle had the following problems and was not suitable for practical use.

That is, even if a reflection film is formed on the surface of the ridge 5, effective reflection is not performed as in the case of the paraboloid-shaped reflection surface 1a. The vicinity of the center is felt dark, and the commercial value is significantly impaired. The present invention has been made in view of the above circumstances, and there is no danger of white light leaking even if there is a gap between the color cap and the lamp housing, and the lamp is viewed from the front. It is an object of the present invention to provide a vehicular lamp with a color cap, which does not cause the vicinity of the central part to be sometimes dark.

[0005]

In order to achieve the above objects (prevention of light leakage and uniform appearance and brightness), a vehicle lamp according to the present invention comprises a lamp housing having a rotating parabolic reflecting surface, A front lens mounted over the front opening of the lamp housing, a light source bulb having a filament positioned near the focal point of the paraboloid of revolution, and a light source bulb mounted on the lamp housing over the light source bulb. And a colored transparent color cap, wherein a rotating paraboloid acting as a reflecting surface is provided on the inner surface of the lamp housing, and the rotating paraboloid has a different focal length and a different focal length. It is composed of a plurality of types of paraboloids of revolution at substantially the same position, and a paraboloid of revolution with a relatively short focal length is arranged in the area covered by the color cap. Together, characterized in that the long parabolic relatively focal length in areas not covered by color cap is disposed.

[0006]

According to the above arrangement, since the paraboloid of revolution is also provided in the area covered by the color cap and effectively reflects light, there is no possibility that the vicinity of the center of the lamp looks dark.
In addition, the paraboloid of revolution covered by the color cap and the paraboloid of revolution not covered by the color cap share a focal point and have different focal lengths. A step occurs at the boundary. The above-mentioned step is inevitably formed at the place where the color cap is in contact with the lamp housing. Therefore, the surface of the step acts as a light shielding surface, and prevents light leakage between the color cap and the lamp housing.

[0007]

FIG. 1 is a schematic sectional view showing one embodiment of a vehicle lamp equipped with a color cap according to the present invention. The present embodiment is an improvement obtained by applying the present invention to the conventional example shown in FIG. 2, and the components denoted by the same reference numerals as those in FIG. 2 are the same or similar components as in the conventional example. Next, a difference between FIG. 1 and FIG. 2, that is, matters improved by applying the present invention will be described. The inner surface of the lamp housing 7 of this embodiment has two types of rotating paraboloidal reflecting surfaces, that is, a rotating parabolic reflecting surface 7a having a relatively long focal length and a rotating surface having a relatively short focal length. The parabolic reflection surface 7b is arranged so as to share the focal point F and the optical axis Z. The long focal paraboloidal reflecting surface 7a is provided in an area not covered by the amber cap 4, and the short focal length paraboloidal reflecting face 7b is provided in an area covered by the amber cap 4. I have. With the above configuration, a step 7c is formed along the boundary between the two paraboloid-shaped reflecting surfaces 7a and 7b. The step 7c is formed along a line (circular in this example) in which the amber cap 4 is in abutment with the lamp housing 7, and is located facing a gap between the amber cap 4 and the lamp housing 7. . As a result, the step 7c fits into the edge of the opening of the amber cap 4 and prevents light leakage from the opening. In addition, since the reflecting surface 7b covered with the amber cap 4 has a shorter focal length than the reflecting surface 7a,
It is located close to the focal point F. Since the filament of the light source bulb 3 is located at the focal point F, the reflection surface 7b is located near the filament, so that the luminous flux density of incident light and reflected light is high. The reflected light having a high light flux density is reflected parallel to the optical axis Z and passes near the center of the front lens 2. The above operation prevents the central part of the lamp from appearing dark.

[0008]

According to the present invention, since the paraboloid of revolution is provided also in the area covered by the color cap and effectively reflects light, there is no possibility that the vicinity of the center of the lamp looks dark. In addition, the paraboloid of revolution covered by the color cap and the paraboloid of revolution not covered by the color cap,
Since the focal points are shared and the focal lengths are different, a step occurs at the boundary between the two paraboloids of revolution. The above-mentioned step is inevitably formed at the place where the color cap is in contact with the lamp housing. Therefore, the surface of the step acts as a light-shielding surface, and has an excellent practical effect of preventing light leakage between the color cap and the lamp housing.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a vehicular lamp provided with a color cap according to the present invention.

FIG. 2 is a cross-sectional view showing a conventional example of a vehicular lamp provided with an amber color cap for a fog lamp.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lamp housing, 2 ... Front lens, 3 ... Light source bulb, 4 ... Amber cap, 5 ... Protrusion for light shielding, 7 ... Lamp housing, 7a ... Long focal point rotating parabolic reflective surface, 7
b: short focal point rotating parabolic reflecting surface, 7c: step, F: focal position, Z: optical axis of the rotating paraboloid.

Claims (1)

(57) [Scope of request for utility model registration] 1. A lamp housing having a paraboloidal reflective surface, a front lens mounted over a front opening of the lamp housing, and a filament positioned near a focal point of the paraboloid of revolution. A vehicular lamp, comprising: a light source bulb disposed therein; and a colored transparent color cap mounted on the lamp housing so as to cover the light source bulb, wherein a paraboloid of revolution acting as a reflection surface on an inner surface of the lamp housing. Is provided, and the paraboloid of revolution is composed of a plurality of types of paraboloids of revolution having different focal lengths and substantially the same focal position, and the area covered by the color cap has a relative focal length. A short paraboloid of revolution is arranged, and a paraboloid of revolution with a relatively long focal length is arranged in the area not covered by the color cap. To, a vehicle lamp having a color cap.