| 摘要 |
A charging device for cameras which is usable for a charging apparatus as a driving source for various operations within a camera. The charging device has a linear actuator of a shape memory alloy which extends and contract by the shape restoring action thereof, and a current supplier for applying a predetermined current to the actuator of a shape memory alloy for heating it. The extending and contracting operation of the actuator of a shape memory alloy is utilized for charging a shutter charging apparatus, charging and releasing a shutter charging apparatus or charging the driving force for a focusing lens. The charging device can simplify the structure of various charging apparatuses, reduce the weight thereof and realize a silent-operation camera.
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