| 摘要 |
PURPOSE:To avoid deterioration of characteristics caused by depolarization even if a high electric field is applied by a method wherein electrodes are provided on both sides of the polarizing direction of a piezoelectric slipping effect type actuator element and a DC source is connected so as to apply an electric field with the same direction as the polarization to the element. CONSTITUTION:Two terminals of a driving source 30 are connected to electrodes 22 and 23 formed on a piezoelectric slipping effect type actuator 11. An electric field formed between the electrodes 22 and 23 deforms the piezoelectric slipping effect type actuator 11 and creates a fine displacement. A subsidiary source 60 is a DC source for preventing depolarization and its two terminals are connected to electrodes 41 and 42 formed on the piezoelectric slipping effect type actuator 11 and an electric field formed between the electrodes 41 and 42 has the same direction as the polarization of the element. With this constitution, the depolarization of the element can be avoided. |
