| 摘要 |
PURPOSE:To enable various kind of deformations by reducing the influence by the displacement due to the time delay of polarization or residual polarization by a method wherein a part of a bimorph is provided with the part displacing to the reverse direction to the main body, and the displacement is controlled by forward-reverse driving part. CONSTITUTION:Piezoelectric sheets 2 and 3 adhered on both surfaces of a metallic plate 1 so that the direction (p) of polarization becomes the same direction. The sheets 2 and 3 have the forward directional driving parts 2a and 3a and the reverse directional driving parts 2b and 3b (the direction of polarization is p'). The forward directional driving parts are provided with outside electrodes 4a and 5a, and the outside surface of the reverse directional ones with auxiliary electrodes 4b and 5b. Further, inside electrodes are formed in common to both the driving parts and earthed to the metallic plate 1. The electrode 4a and 5a are connected by means of a lead 7' and then connected to the positive terminal of a power source 9 by means of a lead wire 7. The metallic plate is connected to the movable contact of a variable resistor connected to the power source 9 by means of a lead wire 8, and the electrodes 4b and 5b to the negative terminal of the power source 9. Thus, the influence by the displacement due to the time delay of polarization or residual polarization can be reduced. |
