| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin linear actuator that is suitable for driving an optical element such as a lens. SOLUTION: Cylindrical supermagnetostrictive elements 31 to 34 are arranged in magnetic field having uniform intensity in a circumferential direction, and have uniform expansion and contraction amounts. Thus, the supermagnetostrictive elements 31 to 34 are expanded and contracted without inclining an axial line. The the supermagnetostrictive elements 31 to 34 which expand and contract by supply of power to a coil 50 has a cylindrical shape, thereby increasing supporting end faces of the supermagnetostrictive elements 31 to 34. Even when large pressure is received by reaction force from a driven member 20, they have almost rotationally symmetric shape, and the supermagnetostrictive elements 31 to 34 uniformly and translationally expand in an axial line direction. They linearly move with high rigidity without inclining the driven member 20 while securing linearity without using any guide mechanism. COPYRIGHT: (C)2011,JPO&INPIT
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