| 摘要 |
PURPOSE:To reduce the size and the weight of a linear actuator by flowing a current by an alloy which has a shape memory effect of coil spring shape and activating the temperature rise generated by an electric resistance of the entire alloy, thereby simplifying the structure. CONSTITUTION:A linear actuator is composed to elevationally move a movable article 1, and has an alloy 2 of a coil spring shape including thermal shape memory effect and a current controller 3 which is connected across the alloy 2 and controls a current flowed through the alloy. The alloy 2 is elongated by the load of the article 1 at the low temperature time, and the article 1 is disposed at the lower position. When the coil current is flowed while controlling the alloy by the controller 3, the alloy 2 is transformed from Martensite phase to mother phase when the alloy 2 is heated to the temperature intrinsic for the alloy or higher, and recovered in shape as the tension coil. |
