Patent ID: 8063536

Claim:
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.