Collapsible overhead projector

Details Collapsible overhead projector Collapsible overhead projector

1986-07-23

1987-09-29

Haroian, Harry W.

Optics: image projectors

Episcope

Reflector between lamp and screen

353DIG4, 353119, G03B 2116

Patent

active

046965572

ABSTRACT:
A Fresnel lens is mounted on a base in the form of a thin rectangular plate to be placed on a flat table. A document to be projected is put on the Fresnel lens. A main projector body housing a power supply is pivotally mounted on one end of the base. A head having a light source and a mirror is angularly movably coupled to a post arm which is angularly movably or telescopically coupled to the main projector body. When not in use, the base, the main projector body, the head, and the post arm are collapsed and combined into a single block body for easy transportation and storage.

REFERENCES:
patent: 2767611 (1956-10-01), Fitzgerald
patent: 3059529 (1962-10-01), Lucas
patent: 3176578 (1965-04-01), Bolsey
patent: 3209646 (1965-10-01), Appeldurn et al.
patent: 3516733 (1970-06-01), Lucas
patent: 3525566 (1970-08-01), Altman
patent: 3711194 (1973-08-01), Wilson
patent: 4565430 (1986-01-01), Grunwald
patent: 4588271 (1986-05-01), Emura

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