1975-03-06
1977-12-27
Tomsky, Stephen J.
354241, 354173, 354 51, G03B 700, G03B 928
Patent
active
RE0295051
ABSTRACT:
An automatic shutter control system for a camera includes a continuous rotatable motor coupled to a pair of separately engageable electromagnetic clutches. The clutches are respectively operable, when engaged, for releasing the shutter to commence exposure and for winding up the shutter after exposure has terminated. When camera operation is initiated, the first clutch is engaged to release the shutter and to trigger the start of a manually selectable exposure duration. At the conclusion of the selected duration, the first clutch is disengaged and the second clutch is engaged to begin the wind-up of the shutter. An inertial sensor on the motor terminates the wind-up operation and disengages the second clutch when the increased torque on the motor from wind-up reaches a predetermined value. Where continuous operation of the camera is desired, the completion of wind-up triggers an interval control circuit which effects the reengagement of the first clutch after a prescribed time delay to initiate another cycle of operation. Facilities are provided for overriding the manually set exposure duration whenever the required film exposure time exceeds such set duration to automatically delay the completion of the shutter release operation until the completion of the exposure.
REFERENCES:
patent: 2949834 (1960-08-01), Doyle et al.
patent: 3135181 (1964-06-01), Gevatter
patent: 3656420 (1972-04-01), Aizawa et al.
patent: 3687027 (1972-08-01), Watanabe et al.
patent: 3703649 (1972-11-01), Maida
Aizawa Hiroshi
Ogiso Mitsutoshi
Canon Kabushiki Kaisha
Perkey William B.
Tomsky Stephen J.
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