Patent ID: 8493006

Claim:
A drive unit, comprising: a vibratory actuator having an actuator body formed using a piezoelectric element, and configured to output a driving force by inducing vibration in the actuator body, a control section configured to induce the vibration in the actuator body by applying a first and a second AC voltages having a same frequency and different phases to the piezoelectric element, a first current detector configured to detect a first current which flows depending on the first AC voltage, and a second current detector configured to detect a second current which flows depending on the second AC voltage, wherein the control section adjusts the first AC voltage and the second AC voltage so that the first AC voltage and the second AC voltage have different voltage values from each other, and the control section adjusts a voltage value of the first AC voltage and/or a voltage value of the second AC voltage based on detection results of the first and the second current detectors.