JPH0319121Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle lamp used as a front turn signal lamp of an automobile, and in particular to an improvement of a reflective surface such as a reflector thereof.

[Conventional technology]

For example, an automobile lamp used as a front turn signal lamp needs to diffuse light not only in the horizontal direction but also in the vertical direction, and various means have been devised for this purpose. In this case, diffusion in the horizontal direction is generally performed by a lens cut, but diffusion in the vertical direction is considered to be performed by a lens or by a reflective surface.

For example, the reflective surface of the housing or reflector may be a single paraboloid, the lens may be made with a fisheye cut for vertical and horizontal diffusion, an inner lens may be used for vertical diffusion, or the reflective surface may be multiple paraboloids for both vertical and horizontal diffusion. , either the left and right diffusions should both be dependent on the reflective surface.

An example of a configuration in which the above-mentioned reflecting surface is a single paraboloid is shown in FIGS. 5 and 6. FIG. 5 shows a light bulb 22 mounted in a housing 21 having a single parabolic reflecting surface 21A with its filament 22A located at the focal point, and a kamaboko cut 23A.
This is a case where the lens 23 which has been subjected to this process is attached to the front opening. Fig. 6 shows that a light bulb 32 is installed in a housing 31 having a single parabolic reflecting surface 31A, a lens 33 with left and right diffusion cuts is attached to the front opening, and a vertical diffusion cut is installed inside the lens 33. This is a case where an inner lens 34 that has been subjected to

In either of these configurations, the pattern without a lens is as shown in Figure 7, and this light distribution pattern
In Fig. 5, A' is the lens 23 with a fisheye cut.
Also, in FIG. 6, the light is diffused vertically and horizontally by the lens 33 and the inner lens 34.

[The problem that the idea attempts to solve]

However, fisheye cutlet (kamaboko cutlet) 23A
If a lens 23 subjected to this process is used, the diffusion due to the lens cut will be as shown in FIG. 8, and an upper and lower dividing line B will appear, resulting in poor appearance.

Further, when the inner lens 34 is used, the number of parts increases, and assembly becomes labor-intensive.

The purpose of the present invention is to provide a vehicle lamp that has a simple structure, can diffuse a light image vertically and horizontally without spoiling the appearance, and does not significantly reduce the central luminous intensity. It is.

[Means to solve the problem]

This invention focuses on a light bulb installed so that the center point of the filament is located on the center line of the light fixture and its longitudinal direction is perpendicular, and a point a required distance above and below the center point of the light bulb's filament. The part of two paraboloids that is inside or outside of the other side,
A reflecting surface formed into a desired shape by continuously combining two paraboloids through a paraboloid or a curved surface approximating the paraboloid, and a front lens having a diffusion cut in the left and right direction. It is characterized by the fact that it is equipped with

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is a housing having a reflective surface 1A, and 2 is a filament 2A mounted in the housing 1 so that the center of the filament 2A is located on the optical axis (center axis of the lamp). light bulb, 3
is a lens attached to the front opening of the housing 1 with a diffusion cut in the left and right direction.

The reflective surface 1A is a part of the paraboloids P1 and P2 (with a focus on points F1 and F2 that are 1 to 3 mm (1/2 of the maximum filament length) apart from the center point of the filament 2A in the longitudinal direction). (inner part)
In the vicinity of the intersection, these two paraboloids are combined so as to be continuous via a paraboloid that is in contact with the paraboloids or a curved surface Q close to this. This is to increase the central luminosity.

With such a structure, the pattern without a lens will be as shown in FIG. 2, and the pattern A will be significantly enlarged in the vertical direction compared to pattern A' in FIG. 7 when a single paraboloid is used. Therefore, when horizontal diffusion by the lens 3 is added, a diffusion state as shown in FIG. 3 is obtained, and no upper and lower dividing lines occur.

In addition, in the above embodiment, two paraboloids P1 and P2
However, depending on the size of the filament of the light bulb used, the inner parts of the two paraboloids P1' and P2' can be used as two paraboloids, as shown in Figure 4. The reflective surface 1A' may have a shape that is combined so as to be continuous via a parabolic surface or a curved surface Q' close to the parabolic surface that is in contact with the surface.

[Effect of idea]

As described above, according to the present invention, parts of two paraboloids having focal points at two points located on the central axis of the filament are connected to each other via a paraboloid or a curved surface approximating the paraboloid. This is combined to form a reflective surface, and this is combined with a lens with a diffusion cut in the horizontal direction to perform vertical and horizontal diffusion, making it possible to diffuse in the vertical direction without creating a vertical dividing line. It has a good appearance, does not significantly reduce the center luminous intensity, and has a small number of parts, so it is easy to assemble.

[Brief explanation of drawings]

Fig. 1 is a structural explanatory diagram showing one embodiment of a vehicle lamp according to the present invention, Fig. 2 is a diagram showing a light image (pattern without lens) of the same embodiment, and Fig. 3 is a diffusion diagram of the same embodiment. Fig. 4 is a structural explanatory drawing showing another embodiment of the present invention, Figs. 5 and 6 are structural explanatory drawings showing a conventional example, and Fig. 7 is an optical image in the conventional example (without lens). FIG. 8 is a diagram showing the diffusion state of a conventional example (when a fisheye cut lens is used). 1... Housing, 1A, 1A'... Reflective surface,
2... Light bulb, 2A... Filament, 3... Lens, P1, P2... Paraboloid, F1, F2... Focal point of paraboloid, Q, Q'... Paraboloid or curved surface approximating it. .

Claims (1)

[Scope of utility model registration request] A light bulb installed so that the center point of the filament is located on the center line of the light bulb and its longitudinal direction is perpendicular, and two paraboloids whose focal points are points a required distance above and below the center point of the light bulb's filament. A reflective surface that has a desired shape by combining the inner or outer portions of the surfaces through a paraboloid that touches two paraboloids or a curved surface that approximates this, and A vehicle lamp characterized in that it is equipped with a front lens having a diffusion cut.