Microform reader

Details Microform reader Microform reader

1975-03-31

1977-09-27

Stephan, Steven L.

Optics: image projectors

Cabinet encloses projector and one side of screen

350252, 353 76, 353 96, 353 99, 353101, G03B 2122, G02B 702, G03B 300

Patent

active

040507998

ABSTRACT:
The disclosure relates to a microform reader apparatus of the type which projects a magnified image of an image film frame onto the rear side of a viewing screen to facilitate forward viewing of the magnified image. The microform reader of the present invention includes an adjustable mirror assembly positioned between a light source and condensing lens for optimizing the brightness of the displayed image. In a preferred form the mirror assembly is adjustable from the front of the microform reader to allow simultaneous monitoring of the brightness of the display while the adjustment is being made. The microform reader of the present invention also includes an adjustable lens assembly which allows the optical axis of the lens assembly to be adjusted for perpendicularity to the image frame surface.

REFERENCES:
patent: 2137286 (1938-11-01), Herbig
patent: 3296924 (1967-01-01), Levin et al.
patent: 3588230 (1971-06-01), Rieux
patent: 3634005 (1972-01-01), Peters et al.
patent: 3860333 (1975-01-01), Graef
patent: 3879112 (1975-04-01), Hickey

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