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

1993-12-10

1996-06-11

Gromada, Denise L.

Illumination

Revolving

362237, 362241, 362255, 362298, F21V 708, F21V 800

Patent

active

055262376

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.

REFERENCES:
patent: 4089047 (1978-05-01), Luderitz
patent: 4425604 (1984-01-01), Immai et al.
patent: 5016150 (1991-05-01), Gordin et al.
patent: 5099399 (1992-03-01), Miller et al.
patent: 5239230 (1993-08-01), Mathews et al.
patent: 5317484 (1994-05-01), Davenport et al.

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