JPH0139362Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a replaceable headlamp, and particularly to an improvement of its reflector.

[Prior art]

Replaceable head lamps recently approved in the United States are
As shown in FIGS. 11 and 12, it combines a reflector 1 with a single focal length F, a lens 2, and a halogen bulb 3 with a standardized C-6/C-6 type filament.

Compared to headlamps with C-8/C-8 filament type bulbs, this type of headlamp uses a lens cut to diffuse and distribute light widely from side to side, so the vertical inclination angle α of the lens surface is When using a large lamp, the light sagging phenomenon occurs due to the light diffusion angle, and the light does not spread left and right as intended.If the vertical tilt angle exceeds 20 degrees,
For passing beams with light distribution standards according to SAE J579C
There is difficulty in satisfying the standard values of 2゜D-15゜L and R. As a result, if the vertical inclination angle of the lens surface is large, the light illuminating the far side of the road will be reduced in terms of light distribution on the road surface, resulting in problems such as poor light distribution feeling on the road surface.

Note that the light sagging phenomenon due to the light diffusion angle means that when the lens vertical inclination angle α is 0° as shown in Figure 13a, the filament projection is horizontal, but as the inclination angle increases, When the inclination angle α becomes 30° as shown in b, both ends of the filament projection, especially the right end, are lowered and the shaded area becomes darker.

[Purpose of invention]

An object of the present invention is to provide an automobile headlamp that can reduce the sagging phenomenon of light even with a lens having a large vertical inclination angle and has a good light distribution feeling.

[Summary of the idea]

The present invention provides a headlamp that combines a paraboloid of revolution reflector, a light bulb having a traveling beam filament and a passing beam filament arranged above and below perpendicular to the axis of the paraboloid of revolution, and a front lens. An auxiliary paraboloid of revolution reflecting mirror is arranged at the center of the paraboloid of revolution of the reflecting mirror so that the focus is on the filament for the passing beam of the light bulb, and the center axis of the paraboloid of revolution is tilted at a required angle. This is a characteristic feature.

〔Example〕

FIGS. 1 and 2 a, b, and c show an embodiment of the present invention, in which a small area around the bulb insertion part of a parabolic reflector 11 having a basic reflecting surface F1, that is, a light bulb 12 Parabolic reflecting mirrors 13A and 13B, which serve as auxiliary reflecting surfaces F2 and F3, are installed in an area where the amount of light emitted from the filament can be effectively used, and where there is a large vertical position difference between the traveling beam filament image and the passing beam filament image. The light bulbs 12 are combined so as to be sandwiched between the left and right sides.

The auxiliary reflective surfaces F2 and F3 have different arbitrary focal lengths. The reflective surface F2 has a focus on the passing beam filament and is similar to the basic reflective surface F1.
With respect to the parabolic center axis, the central axis is tilted downward by 0 to 4 degrees, and the left and right central axes are tilted to the right by 2 degrees to 15 degrees.
In addition, the reflecting surface F3 has a focus on the passing beam filament, and its center axis is tilted downward by 0 to 4 degrees with respect to the parabolic center axis of the basic reflecting surface F1, and the left and right sides are centered at 2 degrees to 15 degrees to the left. The axis is tilted.

The dimensional relationship between the above auxiliary reflective surfaces F2 and F3 is as follows.
As shown in Figures a, b, and c.

Although not shown, the basic parabolic reflector
A front lens is disposed in the front end opening of 11.

A headlamp with such a structure has a screen spot light pattern as shown in Figure 7a (traveling beam) and Figure 7b (passing beam), compared to the conventional headlamp shown in Figures 10a and 10b. This creates a wide pattern. This wide pattern of spot light reduces the light diffusion operation by the lens. Therefore, a lens with a large vertical inclination angle (20 degrees or more) can reduce the light sagging phenomenon and improve the light distribution feeling. In other words, it is possible to brightly illuminate the far shoulder of the road surface.

3 and 4 a to 4 c show a second embodiment of the present invention, in which reflective surfaces F2, F3, F
4. Auxiliary parabolic reflector 14A, 14 with F5
B, 14C, and 14D are combined in a horizontal row.

The auxiliary reflective surfaces F2 to F5 each have a different arbitrary focal length. The reflecting surface F2 has a focus on the passing beam filament and is a basic parabolic reflector 1.
With respect to the central axis of the paraboloid 1, the central axis is tilted downward by 0 to 4 degrees, and the left and right central axes are tilted to the left by 5 degrees to 15 degrees.
The reflecting surface F3 has a focal point on the passing beam filament, and is centered on the parabolic center axis of the basic reflecting mirror 11.
The center axis is tilted 0 to 4 degrees downward, and the center axis is tilted 2 degrees to 5 degrees to the left and right. The reflecting surface F4 has a focus on the passing beam filament, and its center axis is tilted downward by 0 to 4 degrees with respect to the parabolic center axis of the basic reflecting mirror 11, and its center axis is tilted by 2 degrees to 5 degrees to the right on the left and right sides. ing. The reflecting surface F5 has a focus on the passing beam filament, and its center axis is tilted downward by 0 to 4 degrees with respect to the parabolic center axis of the basic reflecting mirror 11, and its center axis is tilted by 5 degrees to 15 degrees to the right on the left and right sides. ing.

The dimensional relationships of the auxiliary reflective surfaces F2 to F5 are as shown in FIGS. 4a, b, and c, and the screen spot light patterns thereof are as shown in FIGS. 8a, b.

5 and 6 a, b, and c show a third embodiment of the present invention, in which a small area around the bulb insertion part of a basic parabolic reflector 11 having a reflecting surface F1 is shown.
Auxiliary parabolic reflecting mirrors 15A, 15B, 15C, and 15D having reflecting surfaces F2, F3, F4, and F5 are combined so as to sandwich the light bulb 12 from above and below and from left and right.

Each of the reflective surfaces F2 to F5 has a different arbitrary focal length. The reflecting surface F2 has a focus on the passing beam filament, and its center axis is tilted downward by 0 to 4 degrees with respect to the parabolic center axis of the basic reflecting mirror 11, and its center axis is tilted to the left by 2 degrees to 15 degrees on the left and right sides. ing. The reflecting surface F3 has a focal point on the passing beam filament, and is tilted downward by 2° to the center axis of the paraboloid of the basic reflecting mirror 11.
The central axis is tilted 6 degrees, and the left and right central axes are tilted 2 degrees to 15 degrees to the left. The reflecting surface F4 has a focus on the passing beam filament, and its center axis is tilted downward by 0 to 4 degrees with respect to the parabolic center axis of the basic reflecting mirror 11, and its center axis is tilted by 2 degrees to 15 degrees to the right on the left and right sides. ing. The reflecting surface F5 has a focus on the passing beam filament, and its center axis is tilted downward by 2° to 6° with respect to the parabolic center axis of the basic reflecting mirror 11, and its center axis is tilted 2° to 15° to the right on the left and right sides. It's leaning.

The dimensional relationship of the auxiliary reflective surfaces F2 to F5 is as shown in FIGS. 6a, b, and c, and the screen spot light pattern thereof is as shown in FIGS. 9a, b.

In the second and third embodiments as well, the screen spot light pattern is a wider pattern than the conventional one, and even with a lens having a large vertical inclination angle, the light sagging phenomenon is reduced and the light distribution feeling is improved.

[Effects] As described above, according to the present invention, a plurality of auxiliary parabolic reflectors are combined in the central part of the basic single focus reflector to distribute light (spots) to the required light distribution area, especially in the case of passing beams. light), so
The spot light (C-6/C-6 filament type) has a wider pattern than the conventional one, and when a lens with a large vertical angle of inclination (20 degrees or more) is used, it has the following effects.

(1) Wide pattern spot light reduces the light diffusion operation by the lens, so even with lenses with large vertical tilt angles, light sagging phenomenon is reduced.
The light distribution feeling becomes good.

(2) Light distribution can be determined freely using spot lights.

(3) Lens cut design becomes easier.

(4) A headlamp with a vertical lens tilt angle of 20° or more, with a passing beam of 2°D− according to SAE J579C.
It becomes easier to satisfy the standard values of 15°L and R.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of an automobile headlamp according to the present invention, FIGS. Figure 5 is a perspective view showing the second and third embodiments of the present invention, Figures 4 a, b, c and 6.
Figures a, b, and c are cross-sectional views and front views showing the dimensional relationships of the reflecting mirrors in the second and third embodiments, Figures 7a, b to 10 a, and b are screen spot light patterns, 12 are a front view and a sectional view showing a conventional example, and FIGS. 13a and 13b are diagrams for explaining the light sagging phenomenon. 11...Basic parabolic reflector, 12...Light bulb,
13A, 13B, 14A-14D, 15A-15
D...Auxiliary parabolic reflector, F1-F5...Reflection surface.

Claims (1)

[Scope of utility model registration request] In a headlamp that combines a paraboloid of revolution reflector, a light bulb having a traveling beam filament and a passing beam filament arranged above and below perpendicular to the axis of the paraboloid of revolution, and a front lens, An automobile characterized in that an auxiliary paraboloid of revolution reflector is arranged at the center of the paraboloid of revolution so that the mirror has a focal point on the filament for the passing beam of the light bulb, and the center axis of the paraboloid of revolution is tilted at a required angle. head lamp.