Overhead projector with centerless Fresnel lens reflective stage

Details Overhead projector with centerless Fresnel lens reflective stage Overhead projector with centerless Fresnel lens reflective stage

1989-08-04

1991-01-22

Haroian, Harry N.

Optics: image projectors

Episcope

Reflector between lamp and screen

353DIG4, 353 38, G03B 21132

Patent

active

049866516

ABSTRACT:
A reflective stage overhead projector has a light source, a projection lens and mirror assembly for focusing and reflecting an illuminated image onto a screen, and a stage area for supporting an image to be illuminated and projected. One reflective surface of the stage area is defined by a noncentral portion of a Fresnel lens.

REFERENCES:
patent: 3293982 (1966-12-01), Appeldorn
patent: 3486817 (1969-12-01), Hubner
patent: 3708222 (1973-01-01), Stern
patent: 4204881 (1980-05-01), McGrew
patent: 4206984 (1980-06-01), Mueller
patent: 4436393 (1984-03-01), Vanderwerf

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