Image projection apparatus

Details Image projection apparatus Image projection apparatus

1993-11-23

1995-08-01

Cuchlinski, Jr., William A.

Optics: image projectors

Reflector

353102, 362296, 362308, G03B 2114, F21V 708

Patent

active

054383790

ABSTRACT:
This invention is directed to an image projection apparatus. The apparatus comprises a light source having first and second high-luminance light-emitting portions along an optical axis, a reflecting mirror, arranged behind the light source, for reflecting light beams from the first and second light-emitting portions to direct the light beam from the first light-emitting portion toward a central portion of an image and direct the light from the second light-emitting portion toward a peripheral portion of the image, a projection optical system for projecting the image on a plane, and focusing means, arranged to be adjacent to the image and having a larger focusing effect at a peripheral portion than at a central portion, for causing the light beams from the first and second light-emitting portions to be incident on the projection optical system.

REFERENCES:
patent: 2624234 (1953-01-01), Gretener
patent: 3302517 (1967-02-01), Henkel
patent: 4171874 (1979-10-01), Bigelow et al.
patent: 4636611 (1987-01-01), Penney
patent: 4642740 (1987-02-01), True
patent: 4722595 (1988-02-01), Shimazaki
patent: 4770525 (1988-09-01), Umeda et al.
patent: 5192962 (1993-03-01), Nishida et al.

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