U.S. Philips Corporation

Other

Bernhard R Weber

Robert Peter Scholl

Ulrich Niemann

Stephan Offermanns

The invention relates to a headlight or a light ( ) for a vehicle, comprising a diffusing panel ( ), a casing ( ), light sources ( ) mounted in the housing ( ), reflectors ( ) allocated to said light sources and a ventilation system comprising at least one air intake opening ( ), an air outlet opening ( ) and a blower ( ). In order to avoid diminished headlight efficiency in a headlight with fogging plastic parts, the invention provides a blower ( ) that is a suction blower suctioning the air from the causing ( ). Air guiding devices ( ) are mounted inside the causing ( ), in such a way that the blower ( ) guides the air away from the diffusing panel ( ) and directs it pass the hot air pockets towards the back part of the casing opposite to the diffusing panel ( ).

Headlight or light

The high-pressure discharge lamp has a filling in a discharge vessel (1) which includes a rare gas and a metal compound (2) chosen from hafnium halides and zirconium halides. The halide evaporates and discomposes to form incandescent, condensed metal particles. The lamp may be electrodeless and may in addition contain a buffer gas as a component of its filling. Alternatively, the lamp may have internal electrodes (13) and contain mercury (12) as a buffer gas. The lamp has favorable light generating properties, in particular a good color rendering, and in addition may have a very high luminous efficacy.

High-pressure discharge lamp with incandescing metal droplets

An electrodeless high pressure discharge lamp contains a halide or oxyhalide of W, Ta, Re, or rhenium oxide in such a quantity that a supersaturated metal vapor arises in the discharge, by which metal particles are formed. Owing to their high temperature these particles generate thermal emission. The lamp has a high color temperature and a high color rendering index.

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Dusseldorf, Germany

Bernhard R Weber