Shutter release stop device for an electric shutter
AssigneeSeiko Koki Kabushiki Kaisha
InventorKiyoshi Kitai
Life of this patent
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Abstract
An electric shutter having a shutter release stop device that detects the absence of cocking of the shutter and that an electromagnet in the exposure control circuit of the shutter is not properly energized either because the battery is ineffective because it is expended or improperly connected in the circuit or not in the circuit. Detecting means initiates the action of a lock lever or bar that engages the camera shutter release lever and locks it so that it cannot be completely depressed for taking of an exposure. The taking of a photographic exposure is accordingly precluded and the waste of power and film is avoided.
Claims5
In a shutter for a camera;
- a shutter blade means movable from a cocked position to an uncocked position for opening and closing an exposure aperture;
- operating mechanism for operating the shutter blade means comprising a release member operable for initiating taking of an exposure, an electromagnet for controlling the exposure time, a locking member for for selectively locking said release member to preclude initiating taking of an exposure;
- detecting means detecting a first condition when said shutter blade means is in said uncocked position and for detecting a secod condition when said electromagnet is not energized sufficiently to control exposure time;
- means controlled by said detecting means for rendering said locking means effective when at least one of the first and second conditions is present.
Dependencies are inferred from the claim text.