| 摘要 |
PROBLEM TO BE SOLVED: To prevent the temporary lowering of the voltage of a battery due to the driving of a shutter. SOLUTION: The power source of a motor M driving a shutter served also as diaphragm is not obtained from a battery E, but it is obtained from a capacitor C1. As a result, the temporary lowering of the voltage of the battery due to the driving of the shutter is prevented.
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