Electromagnetically actuated shutter for a camera
AssigneeSeiko Koki Kabushiki Kaisha
InventorsMasuo Ogihara, Hiroaki Ishida, Shinji Nagaoka, Koji Sato
Life of this patent
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Abstract
An electromagnetically actuated shutter for a camera wherein automatic focusing and exposing operation are controlled by means of a single reversible stepping motor.
Claims18
An electromagnetically actuated shutter, comprising:
- a movable member mounted for movement in forward and reverse directions between a focusing region and an exposing operation region;
- a single electromagnetic actuating means for forwardly and reversely actuating said movable member;
- an interlocking member mounted to undergo movement with said movable member in said focusing region;
- a focus operating member actuated by forward movement of said interlocking member to effect an automatic focusing operation;
- a focusing control member engageable with said interlocking member to stop the forward movement thereof when said movable member moves through said focusing region and reaches a focusing point;
- shutter blades driven by a sector lever when said movable member undergoes movement in said exposing operation region;
- and
- controlling means operable in response to movement of said movable member into said exposing operation region for producing a reversing signal and applying the same to said electromagnetic actuating means after the lapse of a time corresponding to object brightness information to thereby cause said electromagnetic actuating means to move said movable member in the reverse direction.
In a camera shutter having a set of shutter blades sequentially movable in opening and closing directions to define an exposure interval:
- an actuating member mounted to sequentially undergo forward movement in a forward direction through a focusing region and an exposure region followed by return movement in a return direction through the exposure and focusing regions;
- means operative in response to forward movement of the actuating member in the focusing region to effect an automatic focusing operation;
- means operative in response to forward movement of the actuating member in the exposure region to effect opening movement of the set of shutter blades and operative in response to return movement of the actuating member in the exposure region to effect closing movement of the set of shutter blades;
- and electromagnetic driving means for sequentially driving the actuating member in the forward direction through the focusing and exposure regions and then in the return direction through the exposure and focusing regions.
In a camera shutter having automatic focusing means operative when actuated to effect an automatic focusing operation, and automatic exposure means including a set of shutter blades operative when sequentially actuated in opening and closing directions to effect an automatic exposure operation:
- actuating means displaceable in a forward direction to sequentially actuate the automatic focusing means and thereafter actuate the shutter blades in the opening direction and then displaceable in a return direction to actuate the shutter blades in the closing direction;
- and electromagnetic driving means for sequentially displacing the actuating means in the forward and return directions.
Dependencies are inferred from the claim text.