Added film perforations for frame registration

Details Added film perforations for frame registration Added film perforations for frame registration

1996-06-04

1997-07-01

Blankenship, Howard B.

Optics: motion pictures

Picture carriers

Strip type

355 72, G03C 176

Patent

active

056443765

ABSTRACT:
Systems are described for precisely positioning motion picture film frames at a camera film gate by the use of registration pins that project into film perforations, where the film frames are spaced by 2.5 perforations instead of the standard 4 perforations. In one system, the registration mechanism includes two sets of registration pins which project into film frames as the film is advanced in steps of 2.5 perforations. In another system, additional holes are punched into the standard film stock, so there are holes or perforations located at 2.5 perforation spacings along the length of the film, so only one set of registration pins is required for precision registration of film frames spaced by 2.5 perforations.

REFERENCES:
patent: 3502399 (1970-03-01), Michelson
patent: 3865738 (1975-02-01), Lente
patent: 4702577 (1987-10-01), Weigert

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