Film transport speed control

Details Film transport speed control Film transport speed control

1989-12-27

1990-12-25

Brown, Brian W.

354213, 354215, G03B 118

Patent

active

049807102

ABSTRACT:
The speed of frame-to-frame advance after exposure in a camera having a pawl which acts with a single perforation per frame film to provide frame registration with an aperture station is optimized without film distortion by generation of a motor control circuit feedback signal giving information as to position and speed of the advancing next frame perforation. In one embodiment, a sensor develops a pulsed signal from the toothed edge of a pawl that travels with the film perforation. In another embodiment, the passage of a prerecorded pattern spaced a known distance from the perforation is sensed.

REFERENCES:
patent: 3677159 (1972-07-01), Studley
patent: 4075644 (1978-02-01), Hosono
patent: 4141635 (1979-02-01), Asano
patent: 4175845 (1979-11-01), Iwashita et al.
patent: 4401376 (1983-08-01), Pomazi
patent: 4431292 (1984-02-01), Takahashi
patent: 4474442 (1984-10-01), Shiozawa et al.
patent: 4697899 (1987-10-01), Kawamura et al.

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