1985-04-18
1986-02-18
Perkey, William B.
G03B 118
Patent
active
045710449
ABSTRACT:
A still camera provided with an electric motor for rotating a spool for taking up a roll film drawn out from a cartridge loaded into the camera comprises trigger means for starting the electric motor to start the rotation of the spool, means responsive to the movement of the roll film resulting from the rotation of the spool to generate a reset signal at a predetermined interval while the roll film is moved, means provided so as to be driven by the roll film and detecting that the movement of the roll film has been actually started and generating a detection signal, time counting means adapted to start time counting in synchronism with the trigger means and reset by the reset signal, the time counting means having a first delay time longer than the interval of the reset signal and a second delay time longer than the first delay time, the time counting means generating a time counting output after the lapse of the second delay time before the detection signal is generated, and generating a time counting output after the lapse of the first delay time after the detection signal has been generated, and means responsive to the time counting output to interrupt the operation of the electric motor for rotating the spool.
REFERENCES:
patent: 4400074 (1983-08-01), Akiyama et al.
patent: 4460256 (1984-07-01), Araki et al.
patent: 4502770 (1985-03-01), Niwa et al.
Nippon Kogaku K.K.
Perkey William B.
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