Microfilm reader

Details Microfilm reader Microfilm reader

1977-09-19

1979-03-13

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

353 22, 353120, G03B 2111

Patent

active

041439538

ABSTRACT:
Microfilm is inserted between two or more parallel, transparent, laterally invertible support plates placed in a light path emanating from a light source and travelling to a projection objective. The plates are placed in a tray which can be slided in two directions normal to the light path. The microfilm located more closely to the reader is in proper position for one or more projection objectives. For reading the microfilm located on the other side, the plates are inverted in order to bring this film in proper reading position.

REFERENCES:
patent: 3191490 (1965-06-01), Rabinow
patent: 3319518 (1967-05-01), Carlson
patent: 3352201 (1967-11-01), Brownscombe
patent: 3799664 (1974-03-01), Nicholson

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