Overhead projector

Details Overhead projector Overhead projector

1984-08-31

1986-05-13

Haroian, Harry N.

Optics: image projectors

Episcope

Reflector between lamp and screen

353119, 353 72, G03B 2106

Patent

active

045882711

ABSTRACT:
A portable overhead projector wherein characters, a picture and the like drawn on a transparent sheet rested on a horizontally supported stage can be projected onto a screen or the like, and having a safety device in which a projection unit can avoid impinging upon a mirror-Fresnel plate, thereby preventing damage to it. This safety device features a lock mechanism for preventing projection unit supports from rotating unless the projection unit is folded toward the supports. Furthermore, the overhead projector has a rotatable support for one side of the mirror-Fresnel plate whereby the mirror-Fresnel plate is held horizontally during projection, and is inclined during housing, whereby the projection unit is housed in a space formed by the inclining of the mirror-Fresnel plate.

REFERENCES:
patent: 2496647 (1950-02-01), Woodbury
patent: 2767611 (1956-10-01), Fitzgerald
patent: 3209646 (1965-10-01), Appeldorn et al.
patent: 3459475 (1969-08-01), Lucas
patent: 3516733 (1970-06-01), Lucas
patent: 3525566 (1970-08-01), Altman

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