Microfilm cassette and the projection apparatus for the viewing

Details Microfilm cassette and the projection apparatus for the viewing Microfilm cassette and the projection apparatus for the viewing

1980-10-16

1983-06-21

Dixson, Jr., William T.

Optics: image projectors

Selective data retrieval

Film strip

242 712, 353 78, 206387, G03B 2111, G03B 2128, G03B 2302

Patent

active

043891047

ABSTRACT:
A cassette is fitted with two cylindrical chambers, each of which has, in its center, a spool axis or shaft. The width of the cassette is slightly greater than the width of a strip of microfilm. The two chambers are joined by a pair of separate, flat plates, which extend the walls of the chambers so that the strip of film runs between the two plates, with a window in the central zone of the two plates. The width of the interval between the two plates is small, to press the film accurately into place at a focal plane of the optical system of a microfilm projector. The apparatus for the use of the cassette makes it possible to cause the film to circulate in both directions.

REFERENCES:
patent: 3347142 (1967-10-01), Steisslinger
patent: 3638875 (1972-02-01), Schwartz et al.
patent: 3677487 (1972-07-01), Knowles et al.
patent: 3785728 (1974-01-01), Peters
patent: 3785729 (1974-01-01), Dasher et al.
patent: 3951536 (1976-04-01), Becker
patent: 4247183 (1981-01-01), Thompson

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