1979-02-01
1981-07-14
Hix, L. T.
354173, 354234, G03B 118, G03B 726
Patent
active
042783372
ABSTRACT:
An electric motor drive device for a camera includes an operation switch interlocked with a starting operation member, a memory circuit arranged to memorize the operated movement of the operation member through the output of the operation switch, and an electric motor control circuit which is controlled by the output of the memory circuit. The motor is arranged to be brought into an inhibited state in response to a signal produced by the operation of the operation member and to be released from the inhibited state into a driven state when the memory circuit is inverted by another signal. The latter signal is produced during a returning movement of the operation member in its operation. The memory circuit is provided with a semiconductor switch for allowing power to be supplied to the memory circuit only when it is in operation so as to avoid unnecessary power consumption. The operation of the memory circuit is performed under supply of power received through a constant voltage circuit so as to eliminate the possibility of an erroneous action due to voltage variation which takes place in the power supply when the motor is driven.
REFERENCES:
patent: 3688669 (1972-09-01), Ogiso et al.
patent: 3898679 (1975-08-01), Ogiso et al.
patent: 3946409 (1976-03-01), Toyoda
patent: 4086603 (1978-04-01), Kozuki et al.
Canon Kabushiki Kaisha
Hix L. T,.
Perkey William B.
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