| 摘要 |
PROBLEM TO BE SOLVED: To simplify a mechanism for stopping shutter blades halfway, controlling the blades and set a diaphragm as for a camera shutter device whose shutter blades are used also as a diaphragm. SOLUTION: The camera shutter device is provided with the shutter blades 2L and 2R, control members 3L and 3R, a driving motor 4 and a control part. The shutter blades 2L and 2R are arranged so as to be moved in an opening/closing direction relative to a lens aperture 1A, and the blades are started up from an initial position so as to open/close the lens aperture 1A to perform the exposure operation. The shutter blades 2L and 2R are controlled by the control members 3L and 3R with a prescribed energizing force so that the blades 2L and 2R may be stopped with a prescribed aperture diameter in the case of diaphragming with a prescribed aperture diameter with reference to the lens aperture 1A. In the case of executing the exposure operation by moving the shutter blades 2L and 2R from the initial position to the stop position, diaphragming and thereafter moving the blades into the closing direction, the driving motor 4 is controlled by the control part so that a driving force necessary to start up the blades from the initial position but smaller than the energizing force of the control members 3L and 3R may be generated to hold the shutter blades 2L and 2R at the stop position in contact with the control members 3L and 3R.
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