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US RE29,505 EGranted
Electric control device for a camera
AssigneeCanon Kabushiki Kaisha
InventorsHiroshi Aizawa, Mitsutoshi Ogiso
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AssigneeCanon Kabushiki Kaisha
InventorsHiroshi Aizawa, Mitsutoshi Ogiso
Estimating the term…
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.
An electric control device for a camera which comprises a first electro-magnetic clutch means for shutter release being able to be coupled to a motor being rotated, a second electro-magnetic clutch means for shutter wind-up also being able to be coupled to a motor being rotated, a first clutch control means placing said first electro-magnetic clutch means in a coupled state in association with pressing down of a release button, a lock means operable to lock a release member when said first electro-magnetic clutch means is in coupled state to initiate shutter release, a first switch means responsive to the operation of the lock means to place said first electro-magnetic clutch means in a noncoupled state, a photographing time control circuit rendered effective by the operation of said lock means, a lock release means operative to release the above mentioned lock means after a lapse of time set by said photographing time control circuit, a second electro-magnetic clutch control means responsive to the operation of the lock release means to place the above mentioned second electro-magnetic clutch means in a coupled state, and a second switch means operative upon the completion of the above mentioned shutter wind-up to place the above mentioned second electro-magnetic clutch means in a non-coupled state, whereby separate shutter release and wind-up operations may be accomplished while the motor is being continuously rotated.
In a camera having a shutter capable of being wound and a shutter release member, comprising a rotatable motor, a first electro-magnetic clutch means coupled to the shutter for releasing the shutter and coupleable to the motor, a second electro-magnetic clutch means coupled to the shutter for winding the shutter and coupleable to the motor being rotated, a first clutch control means coupled to the first electro-magnetic clutch means and the release member for engaging said first clutch means in response to operation of the release member, a lock means coupled to the release member and said first electro-magnetic clutch means for locking the release member in a release position when the first electro-magnetic clutch means is engaged, a first switch means responsive to the operation of the lock means for disengaging said first clutch means, a photographic time control circuit coupled to said lock means and rendered effective by operation of said lock means, said time control circuit including a timer, first signal means in said time control circuit coupled to the timer for producing an output signal in response to the timer, second signal means in the time control circuit for producing an output signal in response to external stimuli, a lock release means operative to release said lock means in response to the output signal of said first signal means and said second signal means, a switching means in the time control circuit coupled to said first signal means and said second signal means and said lock release means for selectively applying one of the signals from said first signal means and the signals from said second signal means to said lock release means, a second electro-magnetic clutch control means responsive to the operation of said lock release means for engaging said second clutch means to wind the shutter, a second switch means coupled to the shutter and coupled to said second clutch means for disengaging said second clutch means in response to the shutter being wound.
An electric control device for a camera according to claim 15, wherein the photographing time control circuit and the photographing interval time control circuit comprise timer circuits made as separate units from a main body of the camera.
An electric driving device for a camera in which a shutter release means and a winding means are driven by a driving means to sequentially release and wind a shutter, comprising:
An electric driving device for a camera in which a shutter release means and a winding means are driven by a driving means to subsequentially release and wind a shutter comprising;
Dependencies are inferred from the claim text.