1979-03-16
1980-10-21
Griffin, Donald A.
354213, 354214, G03B 118
Patent
active
042290910
ABSTRACT:
A motor wind up device which is automatically stopped after completion of photography of a roll of film in a camera. A control circuit of the motor controlling the wind up operation is changed over from a stop state to a wind up state by means of a signal produced when the shutter has run. When the motor is once stopped when over-torque is detected at the termination of the film to carry out the release operation, no shutter operation signal is produced because the shutter has not yet been completely wound up so that the motor will not run. When the film is terminated at the beginning of wind up operation, the device prevents the production of a false shutter operation completion signal even if the shutter does not run.
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patent: 3719335 (1973-03-01), Kurasawa
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patent: 4042942 (1977-08-01), Haraguchi
patent: 4054889 (1977-10-01), Tsujimoto
Date Nobuaki
Iwashita Tomonori
Kozuki Susumu
Canon Kabushiki Kaisha
Griffin Donald A.
Perkey William B.
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