| 摘要 |
An actuator includes an electromagnetostrictive element that has one end located on a front side and the other end located on a rear side, an output shaft that penetrates the electromagnetostrictive element and is pressurized toward the rear side of the electromagnetostrictive element, a housing that houses therein the electromagnetostrictive element and the output shaft, bearing portions that respectively support the front side and the rear side of the output shaft, a bias spring provided between the rear side of the output shaft and the housing, and a displacement sensor that detects a position in an axial direction of the shaft.
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