Motion-picture camera accommodating silent-film and sound-film c

Details Motion-picture camera accommodating silent-film and sound-film c Motion-picture camera accommodating silent-film and sound-film c

1977-01-17

1979-04-10

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Common picture and sound record carrier systems

352 14, 352 72, G03B 3102

Patent

active

041485661

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: 3957363 (1976-05-01), Hayashi

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