Motor drive mechanism

Details Motor drive mechanism Motor drive mechanism

1979-05-15

1981-05-19

Griffin, Donald A.

354 60R, G03B 118, B03B 726

Patent

active

042681480

ABSTRACT:
This invention provides a motor drive mechanism for driving a camera having an automatic exposure control circuit. The motor drive mechanism has a trigger button adapted to be depressed for rotating the motor for releasing the shutter and for winding-up operation consisting of film winding, and simultaneous shutter and mirror charging, and a first switch to be closed in response to the depression of the trigger button for actuating the automatic exposure control circuit. The improved motor drive mechanism of this invention has a detecting means to detect the rotation of the motor for releasing the shutter and the rotation of the motor for the winding-up operation, a second switch connected in parallel with the first switch and closed as the detecting means detects the rotation of the motor for shutter release operation and opened as the detecting means detects the rotation of the motor for winding-up operation. Thus the power supply to the automatic exposure control circuit is ensured even when the trigger button is released from the depression before exposure is finished.

REFERENCES:
patent: 3812510 (1974-05-01), Aizawa et al.
patent: 3872481 (1975-03-01), Watanabe et al.
patent: 3946409 (1976-03-01), Toyoda
patent: 4187017 (1980-02-01), Watanabe
patent: 4192599 (1980-03-01), Furuya

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