Patent ID: 8608322

Claim:
A foreign substance removal apparatus comprising: an optical member; a piezoelectric element attached to the optical member; a drive control unit configured to drive the piezoelectric element in a first driving mode for exciting a first bending vibration of the optical member, a second driving mode for exciting a second bending vibration of the optical member, and a third driving mode for simultaneously exciting the first bending vibration and the second bending vibration, the second bending vibration having an order different from an order of the first bending vibration; a vibration detection unit configured to detect a vibration of the optical member when the drive control unit drives the piezoelectric element in the first driving mode and the second driving mode; and a driving parameter generation unit configured to determine a driving parameter for when the drive control unit drives the piezoelectric element in the third driving mode based on a time phase difference between a vibration of the optical member which is detected when the drive control unit drives the piezoelectric element in the first driving mode, and a vibration of the optical member which is detected when the drive control unit drives the piezoelectric element in the second driving mode, wherein the drive control unit is configured to drive the piezoelectric element in the third driving mode with use of the driving parameter determined by the driving parameter generation unit.