Patent ID: 8125119

Claim:
A piezoelectric actuator control circuit for controlling displacement of an object by a piezoelectric actuator that uses a piezoelectric element, on the basis of an amount of displacement of the object obtained in each of a predetermined servo control cycle; the piezoelectric actuator control circuit comprising: a drive pulse generation unit for generating a drive pulse for displacing the object by a predetermined step width, and outputting the drive pulse to the piezoelectric actuator; a step width storage unit for storing an ideal value of a step width; and a control unit for continuously generating the drive pulse a plurality of times within a current servo control cycle, wherein the control unit estimates a residual amount of the displacement amount each time the drive pulse is generated, and stops generation of the drive pulse in the current servo control cycle when the residual amount becomes less than the ideal value, and the residual amount of the displacement is estimated based upon a time division processing between an x component of a two-dimensional position of the object, a y component of the two-dimensional position of the object, an x component of a two-dimensional vibration of the object, and a y component of the two-dimensional vibration of the object.