| 摘要 |
PURPOSE:To change the direction and voltage value of potential and to enable free displacement, by using two pieces a set of laminated piezo-electric elements which are respectively joined to the inside circumferential surface and outside circumferential surface positioned opposite to each other on one side of a displacement member. CONSTITUTION:Two pieces a set of laminated piezo-electric elements 21 and 22, 23 and 24 are provided to a cylindrical displacement member 1 made of spring steel. The elements 21, 22 are laminated with rectangular or plate-shaped piezo- electric elements 211 along the outside circumference of the displacement member and provided with electrodes 212 between the elements 211 and 211. The electrodes 212 are connected alternately +, -, +, - to each other, and the elements 211 are laminated with the crystal directions reversed to each other. The displacement member is thus displaced if a voltage is applied in the direction where the elements 22 and 23 joined on the inside circumferential surface of the displacement member elongate, and conversely if the voltage is applied in the direction where the elements 21, 24 contract. |
