Photography – With film drive – Film movement limiting means
Patent
1995-06-01
1997-08-05
Metjahic, Safet
Photography
With film drive
Film movement limiting means
G03B 100
Patent
active
056551690
ABSTRACT:
Film winding between exposures in a photographic camera is interrupted and/or braked as a function of film velocity. The camera uses velocity in a control mechanism that stops the winding motor as a function of the velocity in response to detection of a film perforation. The function acts on a time interval between sensing a perforation and stopping the motor or applying a brake. The perforation detector and the velocity sensor use a single sensing element that generates first and second signals at the respective leading and trailing edges of a perforation. The time interval between the first and second signals is indicative of film velocity, and is used to determine the stopping function preferably in accordance with a predetermined look-up table. The control then selects an appropriate time interval between sensing a respective one of the perforations and stopping said motor. A brake also may be applied for stopping film movement, and the control applies the brake as a function of the velocity.
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Eastman Kodak Company
Howley David A.
Mahoney Christopher E.
Metjahic Safet
Snee, III Charles E.
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