Patent ID: 7029155
Filing Date: 2006-04-18
Classification: B60Q,F21S,F21V

Abstract:
1. A motor vehicle headlight comprising: a reflector defining a focus and arranged to be oriented along a horizontal axis of the vehicle; a light source situated in the vicinity of the focus of the reflector, whereby to produce a light beam of the cruising type when the light source is lit; at least one filter which is arranged to be able to occupy a withdrawn first position in which interference with the said beam by the filter is absent, and a working second position, in which the filter interferes with at least part of the said beam; and displacement means for displacing the filter between its working and withdrawn positions, the filter being a diffusing and absorbing filter, and being adapted so that any substantial modification of the wavelength of the emergent light as compared with the incident light is absent, the filter being further arranged so that, in its working position, it reduces the intensity of the said beam so that the headlight produces a second type of light beam with reduced intensity, the filter being optionally further arranged to modify the photometric distribution, the said second type of light beam corresponding to Daytime Running Light (DRL) photometry when the said filter is in its working position, the headlight having a lighting surface area which is at least equal to that necessary for the DRL function, wherein the said filter consists of a ribbed and unpolished glass giving absorption and spread of the light beam which are sufficient for the DRL function.