Optical viewing apparatus

Details Optical viewing apparatus Optical viewing apparatus

1976-03-10

1977-10-18

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

With focusing or projection screen

355 5, 355 43, G03B 1328

Patent

active

040543820

ABSTRACT:
An improved microfilm reader/printer is described having a back-projection screen and which permits permanent copies of input material to be produced at magnifications varying between minimum and maximum limits. The viewing screen is too small to accommodate the entire image in both height and width dimensions at the maximum magnification but is positioned and dimensioned to receive all of a maximum sized image in one of those directions. Preferably the screen is large enough to accommodate the full image in both directions at the minimum magnification.

REFERENCES:
patent: 3007369 (1961-11-01), Squassoni et al.
patent: 3181416 (1965-05-01), Halberg
patent: 3526456 (1970-09-01), Sage et al.
patent: 3547531 (1970-12-01), Wells
patent: 3733128 (1973-05-01), Naumann et al.
patent: 3899248 (1975-08-01), Tiger

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