Title: Film transport speed controlling device

Abstract: Disclosed is a film speed control device for a single-system sound camera capable of simultaneous picture/sound recording in which an intermittent film transport mechanism at the exposure station and a constant speed film transport mechanism at a sound station having a magnetic recording head are driven synchronously by separate drive motors. In the control device, the impedance of a high frequency coil is changed in response to changes in the size of a film loop between the stations to control the rate of operation of the intermittent film transport so as to maintain constant the size of the film loop. The output of the high frequency oscillator is used for AC bias for the magnetic recording head, and is rectified for use as a power source for the recording amplifier.

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Inventors: Saito, Fumio (Kawaguchi, JA)

Application Number: 488869
Filing Date: 1974-07-15
Publication_date: 1976-03-09
Assignee: Bell & Howell Japan, Ltd. (Tokyo, JA); Nihon Beru-Haueru Kabushiki Kaisha (Tokyo, JA)
Primary Class(es): 352/14 226/44, 352/21, 352/29, 352/30, 352/180
Other Classes:
US Patent Ref:

3154011	Oct, 1964	Gottscho et al.	226/44.
3244469	Apr, 1966	Hennessey et al.	352/14.

Other Refs:
Primary Examiner: Hix, L. T.
Assistant Examiner: Adams, Jr., Russell E.
Attorney: Peele, Jr.; John E.