Microfilm viewer

Details Microfilm viewer Microfilm viewer

1978-04-13

1979-10-09

Haroian, Harry N.

Optics: image projectors

Projector or screen removable from common housing

353 79, G03B 2130

Patent

active

041704088

ABSTRACT:
A collapsible viewing device for viewing microfilm consists of a carrying case with a bottom part to which is hinged a lid. The case includes a viewing screen, a supply of light, a lever assembly and a spring assembly which, upon opening of the lid, automatically activates the light, moves the screen into its reading position and releasably locks the screen in its viewing position. Closing of the lid against the action of the spring assembly returns the screen into the position in the bottom part of the case against the action of the spring assembly and disconnects the light.

REFERENCES:
patent: 2322023 (1943-06-01), Hopkins
patent: 3618717 (1971-11-01), Anderson
patent: 3704054 (1972-11-01), Robak
patent: 3811763 (1974-05-01), Cordonnier
patent: 3899246 (1975-08-01), Edelstein
patent: 4022526 (1977-05-01), Badalich

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