Device to correct the malfunction in film feed of a perforated f

Details Device to correct the malfunction in film feed of a perforated f Device to correct the malfunction in film feed of a perforated f

1983-05-23

1985-02-12

Hayes, Monroe H.

Optics: motion pictures

Optical rectifier type

Refractor

352 14, G03B 4104

Patent

active

044987455

ABSTRACT:
A compact, easily installable light detector unit is provided to automatically correct malfunction in film feed in projection devices of the type described in U.S. Pat. No. 4,312,576. Light is projected through the perforation apertures in the film and conducted to light sensing a element by means of a fiber optic pipe. The mechanism which corrects malfunctions in film feed is activated only when such correction is required.

REFERENCES:
patent: 1910995 (1933-05-01), Leventhal
patent: 2013350 (1935-09-01), Leventhal
patent: 2107039 (1938-02-01), Leventhal et al.
patent: 4312576 (1982-01-01), DeJeney

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