Moving picture camera with interchangeable film magazine

Optics: motion pictures – Camera and/or projector drive mechanisms – With speed regulation or selection

Patent

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Details

352 14, 352191, 242 7551, 242186, 242183, G03B 122, G11B 1534

Patent

active

042458978

ABSTRACT:
A moving picture camera with interchangeable film magazine comprises in each magazine, a take-up roll on which is wound the exposed film, and an electric motor rotating this roll.
A measuring device is provided for measuring the speed of rotation of the take-up roll and for delivering a first signal representing this speed of rotation. A computer circuit receiving at its inputs said signal and a signal representing the image cadence selected and another signal representing the desired tension for the film, delivers at its ouptut a signal representing the value of the intensity of the electric current supplied to the motor, so that the required mechanical power, in other words the useful electric power supplied by this motor, is constant, for a selected image cadence and a desired film tension.

REFERENCES:
patent: 2906584 (1959-09-01), Hammer et al.
patent: 3564219 (1971-02-01), Mutziger
patent: 3819258 (1974-06-01), Butler et al.
patent: 3910521 (1975-10-01), O'Callaghan et al.
patent: 4000496 (1976-12-01), Beaulieu
patent: 4114995 (1978-09-01), Stieringer et al.

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