| 摘要 |
PURPOSE:To reduce the size, to facilitate the manufacture and to further decrease a cost by rotating an output rotational shaft at a low speed with only a bimorph as a drive source. CONSTITUTION:One ends of a plurality of bimorphs 141-148 are supported radially in cantilever shape to a stationary shaft 13 to circularly dispose the free ends of the bimorphs 141-148. An elastic ring 16 having an inner diameter larger by small size than the diameter of the outer contacting circle of the free ends of the bimorphs 141-148 is disposed rotatably on the outer periphery of the bimorph groups 141-148. An annular frame 11 is concentrically disposed at a small gap to the outer periphery of the ring 16. The bimorphs 141-148 are selectively energized to rotate an output rotational shaft 17 coupled with the ring 16 at a low speed. |
