Cover part for a light source
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United States of America Patent
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Issued Date -
Jun 20, 2002
app pub date -
Dec 20, 2001
filing date -
Dec 20, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a cover part for a light source, in particular for a headlight lamp in a motor vehicle headlight. The cover part has a wall with a first side facing the light source and having light-absorbing action. The wall also has a second side away from the light source, that has a reflective action. In order to achieve high light absorption, improved use characteristics under operating conditions which involved high thermal loads, and longer service life, combined with a production method involving a minimum possible capital outlay, the wall of a composite material having a metallic substrate, to which an optically active multilayer system is applied. The multilayer system is composed of a top layer, being a dielectric layer and preferably an oxide, fluoride or nitride layer of chemical composition MeO.sub.z, MeF.sub.f, MeN.sub.s with a refractive index n<1.8, a middle layer being a chromium oxide layer of chemical composition CrO.sub.x, and a bottom layer being of gold, silver, copper, chromium, aluminum, nickel and/or molybdenum. The indices x, z, r and s indicate a stoichiometric or non-stoichiometric ratio in the oxides, fluorides or nitrides.
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