Control frequency generator for a movie camera

Details Control frequency generator for a movie camera Control frequency generator for a movie camera

1974-01-21

1976-02-24

Braun, Fred L.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

352 23, 352177, G03B 3100

Patent

active

039402088

ABSTRACT:
In a movie camera a control frequency generator for producing a picture and sound synchronizing sinusoidal control frequency using a rotating member of the camera such as a running gear made from a soft magnetic material and having a magnetically discontinuous region formed therein, a permanent magnet having one pole thereof placed in the vicinity of the discontinuous region, and a magnetic flux sensing device placed between the region and the pole of the permanent magnet for sensing the flux changes within the magnetic circuit during rotation of the camera gear and thereby producing the synchronizing control frequency.

REFERENCES:
patent: 1969465 (1934-08-01), Jones
patent: 2730937 (1956-01-01), Martin et al.
patent: 3492068 (1970-01-01), Baron
patent: 3502397 (1970-03-01), Buhler

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