Lighting system for increasing brightness to a light guide

Details Lighting system for increasing brightness to a light guide Lighting system for increasing brightness to a light guide

F - Mech Eng,Light,Heat,Weapons

21

V

F21V 8/00 (2006.01) F21V 7/22 (2006.01) G02B 6/42 (2006.01)

Patent

CA 2137582

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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