JP2551665Y2 - Vehicle lighting - 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 in which an optically ineffective cylindrical portion is formed near a socket of a lamp housing.

[0002]

2. Description of the Related Art FIG. 2 shows a rear combination lamp shown as a conventional example of a vehicular lamp, in which (A) is a front view and (B) is a cross-sectional view taken along line BB. Reference numeral 1 denotes a lamp housing. In this example, two lamp chambers 1a and 1b are provided.
Is formed. Lenses 2a and 2b are mounted so as to cover the front openings of these lamp chambers, and light source bulbs 3a and 3b are arranged in the respective lamp chambers. In the vehicle lamp of the present embodiment, a rotating paraboloidal reflecting surface 1c and an optically ineffective cylindrical portion 1d are formed in the lamp housing in the portion forming the lamp chamber 1a. .

[0003]

FIG. 3 shows an enlarged detail of a portion D surrounded by a chain line in FIG. Light emitted from the filament of the light source bulb 3a and incident on the paraboloid of revolution 1c as shown by the arrow a is reflected toward the front of the lamp as shown by the arrow b. However, as shown by arrows c and c ', light incident on the cylindrical optically ineffective portion is reflected as shown by arrows d and d' and irradiates the socket 4 to heat it. As a result, thermal damage such as melting 4
a, 4b may occur.

In the present invention, the ineffective portion refers to a portion where reflected light from the portion is not effective in forming a desired light distribution pattern, and has a tubular shape surrounding a light source bulb. However, the term “cylindrical” has a broad meaning, including cylindrical, conical, elliptical and elliptical cones, as well as irregularly shaped ones.

The present invention has been made in view of the above circumstances, and there is a possibility that the socket may be thermally damaged due to light reflected by an optically ineffective portion formed around the light source bulb socket. It is an object of the present invention to provide a vehicular lamp without the above.

[0006]

In order to achieve the above object, a vehicular lamp according to the present invention improves the shape of the inner surface of an optically ineffective cylindrical portion and scatters reflected light. Shape.

The above-mentioned "shape for scattering the reflected light" may be irregular unevenness or a three-dimensionally ordered shape (for example, cylindrical prism shape, fish-eye prism shape, etc.). good. In short, the shape is such that the light flux incident and reflected from the filament of the light source bulb is not locally concentrated.

[0008]

According to the above construction, the light emitted from the light source bulb and reflected by the optically ineffective portion is scattered, and there is no possibility that the light is concentrated on a part of the socket. Therefore, thermal damage to the socket is prevented.

[0009]

1A and 1B show an embodiment of the present invention, wherein FIG. 1A is a cross-sectional view near a cylindrical invalid portion 1d, and FIG. The cylindrical invalid portion 1d of the present example has a scattering / reflecting surface 1f formed of cylindrical prismatic irregularities on its inner surface.
Is formed. Therefore, for example, considering light incident in the direction of the arrow e, some light is reflected in the direction of the arrow f due to a slight difference in the incident point, and some light is reflected in the directions of the arrows g and h. Spread. For this reason, even if the light reflected in the direction of arrow f among these reflected lights irradiates the socket 4, the light in the direction of arrow f is only a part of the reflected light, and the socket 4 is overheated and melted. There is no fear of causing thermal damage such as.

Since the above-mentioned scattering reflection surface 1f has a function of scattering and reflecting the incident light, there is no possibility that the front appearance of the lamp will be adversely affected when the light source bulb is turned off. For example, a problem such as a dark shadow appearing at the center of the lens does not occur.

[0011]

When the present invention is applied to a vehicular lamp having an optically ineffective tubular portion near the light source bulb and the inner surface of the tubular portion is made to be a scattered reflection surface, the light is emitted from the light source bulb. The light reflected by the scattering reflection surface is not concentrated on one portion of the socket, and there is no possibility of causing thermal damage to the socket.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a vehicular lamp according to the present invention,
(A) is a sectional view, and (B) is a perspective view.

FIGS. 2A and 2B show a conventional rear combination lamp, in which FIG. 2A is a front view, and FIG.

FIG. 3 is an enlarged detailed view of a portion D in FIG. 2A, for explaining a problem in the conventional example.

[Explanation of symbols]

1, 1 '... lamp housing, 1a, 1b ... light room, 1c
... Rotating parabolic reflection surface 1d ... Cylindrical optically ineffective portion, 1f ... Scattering reflection surface, 2
a, 2b: lens, 3a, 3b: light source bulb, 4: socket, 4a, 4b: thermal damage.

Claims (1)

(57) [Scope of request for utility model registration] 1. A vehicular lamp having a lamp housing provided with a socket for a light source bulb and having an optically ineffective cylindrical shape in the vicinity of the socket of the lamp housing. A vehicular lamp characterized in that the inner surface of the shape is shaped to scatter reflected light.