JPH0227442Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a reflector for a headlamp that is attached to a vehicle such as an automobile, and which has different reflection areas in some parts.

[Conventional example]

For this type of reflector with different reflection areas,
A structure disclosed in Japanese Utility Model Application Publication No. 118201/1983 filed by the same applicant is known. With this known reflecting mirror, by shifting the optical axes of different reflection areas, it is possible to obtain spot patterns with stepwise shifted positions, and from this shifted spot pattern, the actual arrangement can be obtained. In order to obtain a light pattern, a special prism cut is required in the front lens corresponding to the spot pattern, thereby diffusing the light into a desired light distribution pattern.

[Problems to be solved by the invention] When adjusting the light distribution pattern by controlling the direction of light diffusion using a lens cut as in the conventional example, the direction of diffusion cannot be controlled at the stepped portion of the lens cut, and the direction of diffusion is There is a problem that a desired light distribution pattern that is blurry and clear cannot be obtained.

[Means for solving problems]

As a specific means to solve the problems of the conventional example, the present invention divides the reflective surface into upper and lower parts, and has a first reflective surface at the lower part.
A paraboloidal reflection area is formed with a second paraboloidal reflection area at the top, and a plurality of parabolic cylindrical surfaces on a part of either the left side or the right side of the center of the second paraboloidal reflection area. The present invention provides a reflector for a headlamp, characterized in that a third composite reflection area is formed with a parabolic cylindrical composite reflection surface, and the spot pattern of light reflected on the parabolic cylindrical composite reflection surface is Since the light is irradiated directly through the front lens without being diffused, the desired light distribution pattern as imaged can be obtained.

〔Example〕

Next, the present invention will be explained in more detail with reference to the illustrated embodiment. Reference numeral 1 denotes a reflecting mirror, and the reflecting mirror is divided into upper, lower, left, and right sides by a vertical line V passing through the center and a horizontal line H. This reflecting mirror 1 is divided into a first parabolic reflection area A formed at the bottom with the horizontal line H as a boundary, and a second parabolic reflection area B formed at the top, as shown in FIG. Both regions A and B are paraboloids having different focal lengths. That is, a paraboloid is formed such that the focus of the first parabolic reflection area A is located on the front end side of the traveling filament 2, and the focal point of the second parabolic reflection area B is located on the rear end side of the traveling filament 2. has been done.

A third composite reflection area C is provided in a part of the second parabolic reflection area B of the reflecting mirror 1 having such a reflection area and on the right side in the figure, and the reflection area C is formed by a plurality of parabolic columns. It is a composite reflective surface formed by surface 3. In this case, as shown in FIG. 3, the front lens 4 attached to the front side of the reflecting mirror 1 has a corresponding portion that is transparent so that the light reflected by the parabolic cylinder surface 3 is not diffused. It is sufficient to set it to 4a.

Each of the parabolic cylinder surfaces 3 is formed by setting as shown in FIG. That is, to explain one parabolic cylinder surface 3, the traveling filament 2 is generally located on the optical axis X-ray of the reflecting mirror 1.
The end of the parabolic cylindrical surface 3 on the side far from the optical axis Draw a line l' from the point F through the end of the parabolic cylinder surface 3 that is closer to the optical axis F
Make sure the points are projected. In other words, each parabolic cylindrical surface 3 is formed such that the point F at the inner end of the traveling filament 2 is located on or near the straight line l parallel to the optical axis X. Furthermore, the third
A case has been described in which the composite reflection area C is formed on the right side when viewed from the front of the reflecting mirror 1, but even if this area is formed on the left side, it is substantially the same, only symmetrical.

[Effect]

The spot pattern of the reflecting mirror 1 configured in this way will be explained with reference to FIGS. 5 and 6. When the traveling filament 2 is turned on, the spot pattern of the reflecting mirror 1
As shown in FIG. Spot pattern of composite reflection area C
C′ are each distinct and clearly displayed. The spot pattern A' of the lower first parabolic reflection area A is as shown in FIG.

When each of these spot patterns is actually irradiated through the front lens 4, it becomes the light distribution pattern shown in FIG. In this case, the spot pattern C' of the third composite reflection area C is irradiated through the front lens, and the spot patterns A' and B' of the first and second parabolic reflection areas A and B are as follows.
Diffusion is adjusted at a predetermined position on the front lens 4. Therefore, the reflected light reflected by the first and second parabolic reflection areas A and B is irradiated with a spread in the horizontal direction below the horizontal line H, and the reflected light reflected by the third composite reflection area C Since the light is not diffused by the front lens 4, it is irradiated according to the spot pattern C', and the spot pattern C' is irradiated to the left of the vertical line V and along the horizontal line H in the figure, orderly and without blurring, resulting in a desired orientation pattern.

[Effect of idea]

As explained above, the reflecting mirror according to the present invention includes, in addition to the first and second parabolic reflection areas, a third composite reflection area made of a parabolic cylindrical surface in the second parabolic reflection area at the top. Because of this, there is no need for a special prism cut on the front lens at the corresponding position, and therefore the reflected light reflected at the composite reflection area is irradiated without being affected by the lens cut, resulting in a clear arrangement without blurring. This provides an excellent effect in that a light pattern can be obtained.

Furthermore, by providing the third composite reflection area, it can be formed directly through the front lens at the corresponding position without requiring a special prism cut. Although it was extremely difficult to set the cut, the cut can be formed transparently as described above, making it easier to use as a reflector.
Even though it is a movable type, it has an excellent effect of being able to be applied immediately.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the reflecting mirror according to the present invention, Fig. 2 is a sectional view taken along the - hole in Fig. 1, and Fig. 3 is a schematic view of the reflecting mirror with a front lens attached. An illustrative sectional view, Fig. 4 is an explanatory diagram when setting a parabolic cylindrical surface of the reflecting mirror, and Fig. 5 is a second sectional view of the reflecting mirror.
A spot pattern diagram of the parabolic reflection area and the third composite reflection area, FIG. 6 is a spot pattern diagram of the first paraboloid reflection area of the same reflector, and FIG. 7 is a diagram of the entire reflection area of the same reflector. FIG. 1...Reflector, 2...Travelling filament 2, 3
... Parabolic cylindrical surface, 4 ... Front lens, 4a ... Clear part, A ... First paraboloid reflection area, B ... Second paraboloid reflection area, C ... Third complex reflection Area, A′,
B', C'... Spot pattern.

Claims (1)

[Scope of utility model registration request] The reflective surface is divided into upper and lower parts, a first parabolic reflective area is formed in the lower part, and a second parabolic reflective area is formed in the upper part, and either the left or right side of the center of the second parabolic reflective area is formed. A reflector for a headlamp, characterized in that a third composite reflection area having a composite reflection surface formed of a plurality of parabolic cylinder surfaces is formed in a part thereof.