METHOD OF DRIVING PIEZOELECTRIC DEVICE

摘要

Provided is a method of driving a piezoelectric device including a piezoelectric material having at least two phase transition temperatures and is polarized in one of thickness directions, and electrodes disposed on both end surfaces of the piezoelectric material in a direction orthogonal to the polarized direction, the method including: applying an alternating electric field to the piezoelectric device by an electric field applying unit; and applying a bias electric field in accordance with a variation of a coercive electric field due to temperature variation so that an absolute value of an electric field in a direction opposite to the polarized direction in the alternating electric field applied by the electric field applying unit becomes smaller than the coercive electric field and so that a polarization of the piezoelectric material is not reversed by the electric field in the direction opposite to the polarized direction.