Sealed cassette for optical sound projection

Details Sealed cassette for optical sound projection Sealed cassette for optical sound projection

1974-01-15

1977-02-01

Hix, L. T.

Optics: motion pictures

Removable film strip magazine type

Magazines

352 29, G03B 2306

Patent

active

040059316

ABSTRACT:
A film projector system including a sealed film cassette removably mounted ithin an aperture in the projector and driving means in said projector mechanically engaging coupling means extending through said cassette for driving the sealed film between hubs sealed in said cassette intermittently past a film projection location gate in said cassette and continuously past a sound detection location therein, with the projection plane of the film at said projector locations being disposed normal to the projector optical projection optical sound beams and twisted ninety degrees with respect to the plane of that portion of the film wound on said hubs so that the projector beams do not pass between the film hubs. The coupling means extending through seals in the periphery of said cassette are biased in contact with similar coupling means associated with the projector driving means by pressure exerted upon said cassette by a cassette cover hinged to, and latched with, the projector body, and by springs mounted on the cassette cover and at the periphery of said projector aperture. The driving means can consist of stepping motor means supplied selectively with the proper type of electronic pulse input to effect intermittent film advance or continuous film movement at more than one speed in either the forward or reverse direction.

REFERENCES:
patent: 2226363 (1940-12-01), Williams
patent: 3025750 (1962-03-01), Polan et al.
patent: 3268287 (1966-08-01), Nemeth
patent: 3375054 (1968-03-01), Hughes
patent: 3402982 (1968-09-01), Lemelson
patent: 3410498 (1968-11-01), Winkler et al.
patent: 3537779 (1970-11-01), Horvath
patent: 3600070 (1971-08-01), Downey
patent: 3601335 (1971-08-01), Dopkins et al.
patent: 3687531 (1972-08-01), Bogdanowicz
patent: 3692956 (1970-11-01), Northrup
patent: 3746438 (1973-07-01), Misawa et al.
patent: 3840973 (1974-10-01), Potter
patent: 3876296 (1975-04-01), Custer

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