Film sag detecting device for sound cinecamera

Details Film sag detecting device for sound cinecamera Film sag detecting device for sound cinecamera

1978-03-23

1982-04-27

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Picture and sound synchronizing

G03B 3100

Patent

active

043267815

ABSTRACT:
This film sag detecting device for a sound cinecamera is provided with an opto-electronic coupler located along a film path which is formed between a means for intermittent feeding of a film for exposure and a means for continuous feeding of the same for recording sounds thereon. The opto-electronic coupler comprises a light emitting element and a light receiving element and it is placed to allow the film to interrupt a light path which bridges the two light elements exclusively when the film excessively sags, so as to detect any excessive sag of the film.

REFERENCES:
patent: 3597056 (1971-08-01), Sasaki
patent: 3848977 (1974-11-01), Scholz
patent: 3901590 (1975-08-01), Ashida et al.

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