Film feeding apparatus with deceleration control

Details Film feeding apparatus with deceleration control Film feeding apparatus with deceleration control

1995-02-23

1996-06-25

Blankenship, Howard B.

354213, G03B 118

Patent

active

055305032

ABSTRACT:
A motor drive circuit drives a motor to feed a film. A photoreflector detects a perforation formed in the film. A photointerrupter detects a drive amount of the film. A memory detects a 1-frame drive amount of the film on the basis of an output from the photoreflector and an output from a photointerrupter to store the 1-frame drive amount. A CPU reduces a feeding speed of the film on the basis of the 1-frame drive amount stored in the memory and the drive amount detected by the photointerrupter before the 1-frame winding operation is ended. The film having a minimum number of perforations can be accurately stopped at a photographic frame position, and a film end can be detected at high accuracy.

REFERENCES:
patent: 4878077 (1989-10-01), Maeno et al.
patent: 5057859 (1991-10-01), Ishimaru
patent: 5210562 (1993-05-01), Miyazawa et al.

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