Cine camera

Details Cine camera Cine camera

1974-12-16

1976-09-28

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

G03B 3100

Patent

active

039828263

ABSTRACT:
Disclosed is a motion picture camera adapted to expose silent film and so film and having a control mechanism control the rate of film transport by intermittent and constant transporting devices to maintain a standard film transport speed. A high frequency differential transformer couples a power source and control circuitry including a rectifier circuit so that rectified output voltage of the transformer adjusts the intermittent mechanism responsive to the film loop size as detected by a film loop sensor arranged between the transporting devices. The output voltage varies from zero to some value when the loop sensor actuator is displaced from a position corresponding to an orientation when the film loop is of a standard size to modify the intermittent film transporting device to feed film at a rate to re-establish the film loop at the standard size. By changing a switch from sound to silent condition, the control circuit responsive to the loop sensor and the constant transporting device are disabled permitting the intermittent transporting device to be operated at the standard rate. Another standard rate can be selected for either sound or silent operating by actuation of a single switch.

REFERENCES:
patent: 3025750 (1962-03-01), Polan
patent: 3154011 (1964-10-01), Gottscho
patent: 3244469 (1966-04-01), Hennessey

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