Illumination – Modifier mountable on light source envelope – With additional modifier
Patent
1994-09-13
1997-08-26
Cariaso, Alan
Illumination
Modifier mountable on light source envelope
With additional modifier
362293, 362303, 313113, 31331811, F21M 316
Patent
active
056604629
ABSTRACT:
An incandescent lamp assembly, such as an automobile headlight, includes a reflector defining a cavity having a reflecting surface, and an incandescent lamp capsule mounted within the reflector. The incandescent lamp capsule, typically a tungsten halogen incandescent lamp capsule, includes a light-transmissive envelope, a filament sealed in the envelope and a fill material including an inert gas and a halogen additive. A specularly reflective coating is formed on a portion of the envelope for reflecting visible light and infrared radiation emitted by the filament and not directed to the reflecting surface of the reflector. The envelope is ellipsoidally shaped, at least in the portion having the reflective coating, so that the reflective coating reflects visible light and infrared radiation emitted by the filament back to the filament. The reflective coating limits glare and increases the operating efficiency of the headlight.
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Bockley Erich J.
Gagnon Peter R.
Bessone Carlo S.
Cariaso Alan
Osram Sylvania Inc.
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