Patent ID: 8115367
Filing Date: 2012-02-14
Classification: B82Y,G01B,G01Q,H01L

Abstract:
1. A piezoelectric actuator provided with a displacement meter, comprising: a piezoelectric element which is formed into an arbitrary shape, has an internal crystal polarized in an arbitrary direction, and includes electrodes provided on at least two surfaces opposed in a thickness direction thereof; a driver power supply for applying a voltage between the electrodes to generate strain in the piezoelectric element; resistors provided on the electrodes through intermediation of insulators; and a displacement detection device connected with the resistors, for detecting a change in resistance value when an arbitrary voltage is applied between the resistors, to detect an amount of strain of the piezoelectric element, wherein the electrodes of the piezoelectric element, on which the resistors are provided, are set at one of a ground potential or a potential equal to the voltage applied between the resistors and are configured to generate strain when a voltage is applied between the electrodes.