Film rewinding apparatus for a camera

Details Film rewinding apparatus for a camera Film rewinding apparatus for a camera

1997-08-15

1999-04-06

Lee, Eddie C.

Photography

With film drive

Having significant electronic circuit detail

396413, G03B 1302

Patent

active

058929975

ABSTRACT:
A film rewinding apparatus for a camera is described whereby the completion of film rewinding is accurately timed even if environmental conditions change. First edge detecting mechanism is positioned on a winding-spool side of the camera on a path on which perforations of the film pass and second edge detecting mechanism is positioned on the film cartridge side of the camera. A set time period used by a timer for timing the completion of the film rewinding is calculated based on a time period during which perforation edges detected by the first edge detecting mechanism are detected by the second edge detecting mechanism. If the perforation edges of the film are not detected within the set time period, a determination is made that the film rewinding has been completed and the rewinding operation is terminated.

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