Film speed control for sound motion picture projector

Details Film speed control for sound motion picture projector Film speed control for sound motion picture projector

1974-12-19

1976-11-02

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

352 27, G03B 3100

Patent

active

039893618

ABSTRACT:
A sound motion picture system in which sound is recorded on movie film. A constant speed capstan drives the film past a sound transducer, and a claw drives the film incrementally past a film gate. A projection lamp, a DC power supply, and an induction motor for driving the claw are energized from a common source. A film loop between the transducer and the film gate controls a switching circuit for unbalancing the current to the induction motor to control the speed of the motor without materially affecting the rms value of the current supplied to the lamp or the peak - to - peak value of the voltage supplied to the DC power supply.

REFERENCES:
patent: 1912892 (1933-06-01), Eitzen
patent: 3244469 (1966-04-01), Hennessey
patent: 3786327 (1974-01-01), Dyer

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