Drive unit

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, and
• a control section configured to induce the vibration in the actuator body by applying a first and a second AC voltages to the piezoelectric element, where a frequency of the first AC voltage is equal to a frequency of the second AC voltage,
• wherein
• the control section adjusts the frequencies of the first and second AC voltages with the frequencies kept equal to each other, and independently adjusts voltage values of the first and second AC voltages in accordance with the frequencies.

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, and
• a control section configured to induce the vibration in the actuator body by applying a first and a second AC voltages to the piezoelectric element, where a frequency of the first AC voltage is equal to a frequency of the second AC voltage,
• wherein
• the control section adjusts the frequencies of the first and second AC voltages, and
• a difference between a voltage value of the first AC voltage and a voltage value of the second AC voltage changes in accordance with the frequencies of the first and second AC voltages.