Optics: motion pictures – With sound accompaniment – Picture and sound synchronizing
Patent
1979-10-30
1981-06-23
Adams, Russell E.
Optics: motion pictures
With sound accompaniment
Picture and sound synchronizing
352 29, 352 72, 352180, G03B 3102
Patent
active
042747180
ABSTRACT:
In a sound motion picture camera which permits both sound filming and silent filming by selective use of a sound film cartridge and a silent film cartridge, utilization is made of only signals from loop detecting means for detecting variations in the length of a loop of sound film formed between the exposure station and the sound recording station of the camera during the use of the sound film cartridge, whereby during the use of the silent film cartridge, the film transport speed of a first film transport means for effecting film transport at the exposure station is automatically set to a first speed suited for use of the silent film cartridge and during the use of the sound film cartridge, the film transport speed of the first film transport means is changed over between a second speed higher than the film transport speed of a second film transport means for effecting film transport at the sound recording station and a third speed lower than the film transport speed of the second film transport means in accordance with a decrease and an increase in the film loop length so that the film loop may be maintained at a predetermined length.
REFERENCES:
patent: T920009 (1974-03-01), Kosarko
patent: 3982826 (1976-09-01), Saito
patent: 4003643 (1977-01-01), Freudenschuss et al.
patent: 4148566 (1979-04-01), Freudenschuss et al.
patent: 4148570 (1979-04-01), Ichiyanagi
Kohtani Yutaka
Komine Yoshio
Adams Russell E.
Canon Kabushiki Kaisha
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