Optical apparatus

An optical apparatus comprising:

• a vibrated member;
• a piezoelectric member configured to vibrate the vibrated member at a predetermined vibration mode to remove a foreign substance adhered to a surface of the vibrated member, wherein a drive electrode, a first vibration detection electrode and a second vibration detection electrode are provided on a first face of the piezoelectric member, and a ground electrode is provided on a second face of the piezoelectric member;
• a drive unit connected to the drive electrode configured to drive the piezoelectric member;
• a vibration detection unit configured to detect a vibration state of the vibrated member based on a signal from the first vibration detection electrode and the second vibration detection electrode;
• and
• a determination unit configured to determine whether the vibrated member is vibrating in the predetermined vibration mode based on the vibration state detected by the vibration detection unit,
• wherein the first vibration detection electrode and the second vibration detection electrode have an axis-symmetrical shape, and are arranged on the first face so as to be symmetrical with respect to an axis along which a predetermined vibration node occurs when the vibrated member vibrates at the predetermined vibration mode.