| 摘要 |
A shutter control apparatus is constructed for executing an exposure operation of a camera to photograph an object by controlling an actuator which drives a shutter blade to be opened and closed. In the shutter control apparatus, a battery supplies a power supply voltage. A detection circuit detects a variation occurring in the power supply voltage. A drive circuit directly uses the power supply voltage to feed a power to the actuator. The drive circuit switches between an open power for opening the shutter blade and a closing power for closing the shutter blade. A control circuit controls the drive circuit by setting a timing for switching to the closing power in accordance with at least a brightness of an object. The control circuit corrects the timing for switching to the closing power in accordance with the variation of the power supply voltage detected by the detection circuit. Practically, the control circuit operates when the power supply voltage lowers along a time for advancing the timing for switching to the closing power so as to compensate for a delay in the closing of the shutter blade due to reduction in the closing power caused by the lowering of the power supply voltage.
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