Film transport device for a camera

Details Film transport device for a camera Film transport device for a camera

1996-08-30

1998-03-24

Gray, David M.

Photography

With film drive

Having significant electronic circuit detail

396406, 396397, G03B 100

Patent

active

057322996

ABSTRACT:
A camera is provided having a film transport device that performs accurate detection of an end of film, even if there is a change in the electric power voltage or film transport mechanism load, e.g., because of a temperature change in the camera. The film transport device includes a film advance device that winds the film onto the spool of a camera, a motor, and first and second edge detectors that detect perforations in the film by detecting edges of the perforations. The film perforations are arranged before and after the film frame in a direction of the film advancement. A film transport controller stops the winding of the film by the film advance device when the film transport controller determines that the film has been wound to its end. The film transport controller determines that the film end has been reached when a perforation is detected by the first edge detection device prior to the detection of a specified number of perforations by the second edge detection device.

REFERENCES:
patent: 4440481 (1984-04-01), Hoda et al.
patent: 5452055 (1995-09-01), Smart
patent: 5481331 (1996-01-01), Cocca et al.
patent: 5625850 (1997-04-01), Nishinou

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