Image expander for rear-screen projectors

Details Image expander for rear-screen projectors Image expander for rear-screen projectors

1978-11-16

1980-09-09

Stephan, Steven L.

Optics: image projectors

Cabinet encloses projector and one side of screen

Focus or variable magnification

353 78, 353 96, 353101, G03B 2122, G03B 300

Patent

active

042214734

ABSTRACT:
A slide projector located within a rear-screen projector has means therein for projecting images, contained on slides, onto a self-contained projection screen. Two lenses having different focal lengths are mounted within the projector housing and may alternatively be brought into the optical path for projecting slides, having different size formats, such that the projected image fills the projection screen.

REFERENCES:
patent: 2878718 (1959-03-01), Post
patent: 2933978 (1960-04-01), Rosenthal
patent: 3692398 (1972-09-01), Strauss
patent: 3876298 (1975-04-01), Hickey

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