Optics: motion pictures – With sound accompaniment – Picture and sound synchronizing
Patent
1976-03-22
1977-01-18
Hayes, Monroe H.
Optics: motion pictures
With sound accompaniment
Picture and sound synchronizing
352 72, 352180, G03B 3100
Patent
active
040036430
ABSTRACT:
The housing of a motion-picture camera has a cassette-receiving space into which at least one feeler projects to detect the insertion of a sound-film cassette differing in shape from a silent-film cassette. With both types of cassettes the film is intermittently transported past an image gate by a traction claw; in the case of a sound-film cassette a portion of the film downstream of the image window is accessible for engagement by a constant-speed feeder in the vicinity of a sound-recording head. The feed rate of the traction claw is stabilized by a centrifugal governor in the presence of a silent-film cassette; upon sensing a sound-film cassette, the feeler deactivates the governor and synchronizes the claw drive with the constant-speed feeder under the control of a mechanism, such as a loop detector, which measures the length of film between the image gate and the recording head.
REFERENCES:
patent: 2020857 (1935-11-01), Six
patent: 2982172 (1961-05-01), Berkenhoff
patent: 3782812 (1974-01-01), Roller
Def. Pub. T920009, Mar. 5, 1974, Kosarko.
Freudenschuss Otto
Kantner Otto
Revy von Belvard Peter
Dubno Herbert
Hauser Raimund
Hayes Monroe H.
Montague Ernest G.
Ross Karl F.
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