DE7344418U - Headlights - Google Patents

Description

9741 L / br / A

Arnold & Richter KG, 8000 Munich 13

Headlights

The innovation relates to a headlight, consisting of a housing, a lamp with a substantially linear light spot, e.g. arc or filament, and a converging lens, e.g. a Fresnel lens.

As is well known, a headlight should guarantee uniform illumination of the illuminated surfaces. That is so far however, only possible when using conventional lamps that either produce a largely point-shaped arc or else have a two-dimensionally arranged filament (helix).

When using modern incandescent or vapor lamps, e.g. halogen lamps or metal halide lamps, but it is difficult to achieve uniform surface illumination if their filament or their arc have a more or less linear extension. Such lamps belong also halogen lamps, in which the linear filament is arranged in an arc, for example. In particular, these difficulties

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skills in the more and more introductory, so-called Short-arc metal halide lamps where the Arc has a markedly linear expansion. So far, such lamps with an unfavorable linear expansion of the light spot (linear arc or linear filament) tries to achieve a to achieve more uniform surface illumination that, for example, concave mirrors with a structured surface and converging lenses, preferably step lenses, the back of which also has a surface structure is provided. These surface structures (honeycomb pattern or the like) both on the reflective surface of the mirror as well as on the back of the Fresnel lens should be a Elimination of the uneven surface illumination, caused by the more 3-way less linear expansion of the light spot, can be achieved. The scored However, success is insufficient.

The innovation is therefore based on di @ task to construct a headlight of the type described above, which ensures a uniform surface illumination despite the lamp with a substantially linear light spot (arc or filament).

In the case of a headlight of the type described at the outset, the solution to the problem is that the lamp bulb has a matt finish. A headlight according to the innovation achieves a dispersing, radiating effect of the linear arc. For optimal love taxi booty, it is advantageously sufficient to use the Lamp bulb only a partial matting in this way

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to apply that only the light emitted forwards and thus only through the Fresnel lens is influenced by the matting in order to disperse the linear impression of the light spot. For the after Part of the luminous flux emitted at the rear via a reflector, if present, can affect the matting be waived. The lamp bulb becomes due to the light-scattering effect of the partial matting at the matted zone to a certain extent to the secondary radiator.

When using metal halide lamps, a headlight has been asked for the innovation about the solution Task also has the advantage that a multiple of light is generated with reduced connection power will. As a result of this, i.e. due to the better efficiency of these lamps, the heat radiation of such lamps Headlights according to the innovation compared to incandescent headlights with an areal arrangement Filament of the type described at the beginning reduced to a small fraction.

The innovation is exemplified in the following description with reference to the drawing in one embodiment explained.

The headlight consists of a housing 1 , a reflector 2, a short-arc metal halide lamp 3, which is arranged horizontally and a Fresnel lens 4. The lamp bulb has only a partial matting 5 for the forward emitted and thus only through the Fresnel lens light passing through. This has

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compared to a complete matting of the lamp bulb the advantage of a greater light output. In addition, for manufacturing reasons, it is not suitable for every lamp, to matt the flask completely. The lamp bulb therefore remains on its side facing the reflector 2 unmatted.

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Claims (7)

PROTECTION CLAIMS 1. Headlights, consisting of a housing, a Lamp with a substantially linear light spot, e.g., arc or filament, and one collecting lens, for example a stepped lens, characterized in that the lamp bulb has a matt finish (5) to achieve uniform surface illumination. 2. Headlight according to claim 1, characterized in that the lamp bulb is only partially for the after light emerging from the front is frosted. 3. Headlight according to one of claims 1 or 2, characterized in that the matting (5) through Sandblasting is applied. 4. Headlight according to one of claims 1 or 2, characterized in that the matting (5) through chemical etching is applied. 5. Headlight according to one of claims 1 or 2, characterized in that the matting (5) through Vapor deposition is applied " 6. Headlight according to one of claims 1 or 2, characterized in that the matting (5) through partially permeable refractory paint is brought about. 7. Headlight according to one of claims 1 or 2, characterized in that instead of a partial matting directly in front of the lamp bulb, a heat-resistant ground glass is arranged.