Film feed device capable of accurately aligning film by using on

Details Film feed device capable of accurately aligning film by using on Film feed device capable of accurately aligning film by using on

1997-03-17

1999-06-22

Lee, Eddie C.

Photography

With film drive

Film movement limiting means

396406, 396409, 396277, G03B 100

Patent

active

059151374

ABSTRACT:
In a film feed device using a film having two perforations per frame, a perforation width and a perforation interval which are detected by one perforation sensor during a film feed operation are measured as times by timers in a microcomputer or as film moving amounts by a perforation detection circuit. When the time or the film moving amount measured as this perforation interval is less than the value obtained by multiplying the perforation width by a predetermined value, the film feed operation is stopped by a motor driving circuit and a motor. With this operation, even if the film position deviates from a predetermined position at the start of a film feed operation, the film can be accurately aligned with a correct position by using one perforation sensor.

REFERENCES:
patent: 4733265 (1988-03-01), Haraguchi et al.
patent: 5057859 (1991-10-01), Ishimaru
patent: 5414482 (1995-05-01), Iwai et al.
patent: 5530503 (1996-06-01), Takahashi et al.
patent: 5576785 (1996-11-01), Kazami et al.
patent: 5655169 (1997-08-01), Newman

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