Optical overhead projector for electronic images

Details Optical overhead projector for electronic images Optical overhead projector for electronic images

1993-01-25

1993-11-09

Cuchlinski, Jr., William A.

Optics: image projectors

Miscellaneous

353101, 353DIG3, G03B 2100

Patent

active

052607305

ABSTRACT:
A relatively small liquid-crystal display (LCD) device located well above the fresnel stage of an overhead projector produces large, sharp images with full color and motion. A focus-correcting lens moves with the overhead projector's optical head to maintain proper projection-focus and magnification. Spectrally-selective filters are interposed between the LCD device and fresnel stage to avoid LCD deterioration. A fan-actuated shutter or electrically-actuated shutter optionally provide still further protection. Optical collimation methods are employed to attain a large depth-of-field and image brightness.

REFERENCES:
patent: 4728184 (1988-03-01), Kyhl
patent: 4904079 (1990-02-01), Yoshimura et al.
patent: 4953971 (1990-09-01), Highfill
patent: 5168294 (1992-12-01), Davis et al.

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