Compact overhead projector

Details Compact overhead projector Compact overhead projector

1975-03-03

1976-09-07

Aegerter, Richard E.

Optics: image projectors

Epidiascope

353122, 240 413, 240 93, 240103R, 353 98, G03B 2108, F21V 1304, F21V 700

Patent

active

039791602

ABSTRACT:
A compact portable overhead projector providing improved uniformity and efficiency of illumination employs an off-focus light source within a truncated light-diffusing ellipsoidal reflector in conjunction with an off-focus aperture plate adjacent the open end of the reflector.

REFERENCES:
patent: 3126786 (1964-03-01), Appeldorn
patent: 3428800 (1969-02-01), Levin et al.
patent: 3578966 (1971-05-01), Levin
patent: 3707626 (1972-12-01), Deichen
patent: 3708221 (1973-01-01), Schaefer
patent: 3711194 (1973-01-01), Wilson, Jr.
patent: 3744892 (1973-07-01), Shipsey
patent: 3763348 (1973-10-01), Costello
patent: 3768900 (1973-10-01), McLintic
patent: 3806236 (1974-04-01), Downing

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