| 摘要 |
PROBLEM TO BE SOLVED: To provide a spiral spring capable of operating a drive mechanism for a long time, while keeping the smaller size of the drive mechanism. SOLUTION: The spiral spring, used as the power source of the drive mechanism, is formed of an amorphous metal sheet with an S-shaped freely expanding shape, and the inflection point for changing the curving direction of the freely expanding shape is formed closer with respect to the inner end forming a winding-side end part over the intermediate point between the inner end and the outer end forming the other end part to the inner end. Since the amorphous metal has a high tensile strength and a low Young's modulus, the mechanical energy stored in the spiral spring can be increased.
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