Optical projection system with a varifocal projection lens

Details Optical projection system with a varifocal projection lens Optical projection system with a varifocal projection lens

1994-12-30

1996-10-15

Dowling, William

Optics: image projectors

Reflector

Plural

353101, G03B 2128

Patent

active

055648118

ABSTRACT:
An optical projection system capable of displaying an image of M.times.N pixels in various sizes, wherein M and N are integers, comprises an non-point light source, a collimating lens, a focussing lens, an optical baffle, an array of M.times.N actuated mirrors, and a varifocal projection system including a positive power lens and a negative powers lens separated by a distance, wherein the image in various sizes is provided by changing the distance between the positive and negative power lenses in the varifocal projection lens system.

REFERENCES:
patent: 3504117 (1970-03-01), Dueringer
patent: 3989890 (1976-11-01), Nathanson et al.
patent: 4111538 (1978-09-01), Sheridon
patent: 5108172 (1992-04-01), Flasck
patent: 5245369 (1993-09-01), Um et al.
patent: 5260798 (1993-11-01), Um et al.
patent: 5283599 (1994-02-01), Tejima et al.
patent: 5379081 (1995-01-01), Kim et al.

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