Headlight for a vehicle

Details Headlight for a vehicle Headlight for a vehicle

1998-07-09

2001-04-24

Spyrou, Cassandra (Department: 2872)

Illumination

Supported by vehicle structure

Projection-type headlamp

C362S520000, C362S329000, C362S346000, C359S742000

Reexamination Certificate

active

06220736

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to headlights for vehicles.
One of such headlights is disclosed for example in the German patent document DE 32 18 703 A1. This headlight has a reflector, a light source, a lens through which the light reflected by the reflector passes. Moreover, the headlight has a light permeable element which surrounds the lens at least over a part of its periphery, so that the light emitted by the light source and not caught by the reflector can pass and be reflected. For this purpose the element has prisms which deviate the passing light. With this design of the element, when the light source is turned on, the illuminated surface of the reflector relative to the surface of the lens increases, so that no or a little subjective blinding is caused by the reflector. When the light source is turned off, the element becomes dark and the headlight has an undesirable, non uniform appearance. Moreover, with the prisms of the element, only a part of the light passing through the element can be captured.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a headlight for vehicles which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated in a headlight for a vehicle, in which the element is formed at least locally as a Fresnel lens with ring-shaped optical profiles.
When the headlight is designed in accordance with the present invention, the light emitted by the light source, due to the design of the element as a Fresnel lens, is collected during passage through the element with high efficiency.
In accordance with a feature of present invention, the headlight in the turned off position has a brilliant appearance. Due to the collecting action of the fresnel lens, despite the partial screening of the light passing through the element, because of the layer a sufficient illumination of the region around the lens is obtained.
In accordance with still a further feature of present invention a coating can be applied on the profile in a simple manner without covering the entire surface of the element by the coating.
In accordance with still a further feature of the present invention, the distribution of the light passing through the element can be influenced.
The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


REFERENCES:
patent: 4158222 (1979-06-01), Cook
patent: 4814950 (1989-03-01), Nakata
patent: 4949226 (1990-08-01), Makita et al.
patent: 5023758 (1991-06-01), Allen et al.
patent: 32 18 703 A1 (1983-11-01), None
patent: 3218703 A1 (1983-11-01), None

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