Microfilm cassette

Details Microfilm cassette Microfilm cassette

1979-08-01

1981-01-27

Stephan, Steven L.

Optics: image projectors

Selective data retrieval

Film strip

352 78R, 353 95, 353122, 354275, G03B 1726, G03B 2312

Patent

active

042471834

ABSTRACT:
A microfilm cassette for use in an optical projection device in which a film plane is established within the cassette by a film platen supported by the cassette. An additional aspect of this film platen is its support structure which enables it to move transversely with respect to the cassette. A predetermined surface on this film platen is biased against a predetermined surface within the projection device to establish and control the relationship between the film plane and the projection device's optics.

REFERENCES:
patent: 2700917 (1955-02-01), Peters et al.
patent: 3498707 (1970-03-01), Allen
patent: 3679298 (1972-07-01), Knowles et al.
patent: 3700321 (1972-10-01), Peters
patent: 3841745 (1974-10-01), Kaye
patent: 3844642 (1974-10-01), Peters
patent: 3854804 (1974-12-01), McMaster
patent: 4203657 (1980-05-01), Peters

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