Lighting system for increasing brightness to a light guide
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United States of America Patent
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-
Jun 11, 1996
Grant Date -
N/A
app pub date -
Dec 10, 1993
filing date -
Dec 10, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A light source includes an integral reflective coating on a portion of its envelope for reflecting light back through the source. The light from the source is directed by a reflector toward a focus thereof at which is located an input end of a light guide. The integral reflective coating allows a half ellipsoidal reflector to be used in one embodiment without depreciable loss of light. Accordingly, a pair of light sources can be arranged with a common focus to substantially double the brightness in the light guide. Alternatively, the light sources can provide a primary and redundant arrangement, or used to provide two levels of light in another arrangement. According to another embodiment, a hemispherical reflector is used to obtain unit magnification and increase the angular range through which light may enter the light guide.
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