| 摘要 |
A portable electric generating device particularly for an electronic timepiece comprises an oscillatable weight rotatably supported for rotation in either direction by changes in position of the device, rotation converting means for converting oscillation of the oscillatable weight into rotation in one direction and a rotatably energy storing wheel comprising a hub portion driven by the rotation converting means, a coaxial rim portion having on its periphery a plurality of circumferentially spaced teeth and springs connecting the hub portion with the rim portion. A pallet engageable with the teeth restrains rotation of the rim portion of the energy storing wheel until predetermined energy has been stored in the springs whereupon the rim portion of the energy storing wheel is rotated by the springs until again stopped by the pallet. Operation of the pallet is controlled by a cam wheel driven by the rotation converting means. Piezoelectric elements are mounted on the pawls of the pallet in a position to be struck by the teeth of the energy storing wheel whereby electric energy is generated. The piezoelectric elements are connected through a rectifier to a secondary cell and to output terminals of the generating device. Alternatively, a piezoelectric element is mounted in position to be struck by a projecting portion provided on the pallet.
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