Illuminating optical system and projector utilizing the same

Details Illuminating optical system and projector utilizing the same Illuminating optical system and projector utilizing the same

1995-05-30

1998-11-10

Dowling, William

Optics: image projectors

Reflector

G03B 2128

Patent

active

058333410

ABSTRACT:
This invention provides a projector capable of effectively utilizing the light from the light source and significantly reducing the light illuminating the outside of the area to be illuminated, thereby attaining an excellent efficiency of light utilization. In the illuminating system of the present invention provided with a light source and a reflector, there is further provided a circular reflector of a spherical surface, for returning the light, which emerges from the light source to the outside of the area to be illuminated, without being reflected on the reflector, to the light source. Also there is provided a flat mirror or a substantially spherical sub reflector for returning the light, which proceeds to the outside of the area to be illuminated, after being reflected on the reflector, to the light source. The sub reflector may be provided in the vicinity of the light source.

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Elmer, William B. "The Optical Design of Reflectors", Wiley, 1980, pp. 160-165.

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