Method of polarization-treating piezoelectric body

摘要

A method of polarization-treating a piezoelectric body, which is constructed such that current flows through the piezoelectric body in response to application of a DC voltage to the piezoelectric body, includes the steps of measuring current flowing through the piezoelectric body, and stopping the application of the DC voltage at the time when the measured current value reaches a set level. The polarization degree is controlled based on the current value by utilization of a correlation between the current and the polarization degree during polarization. With this method, a desired polarization degree is obtained, and dispersion of the polarization is reduced.