Back to results
US 2012/0236412 A1Published application
Foreign substance removal apparatus and optical apparatus including the same
AssigneeCanon Kabushiki Kaisha
InventorToshifumi Urakami
Life of this patent
Estimating the term…
Abstract
A foreign substance removal apparatus detects how large difference is generated between a time phase of a vibration detected when a bending vibration of an m-order vibration mode is excited at an optical low-pass filter 410, and a time phase of a vibration detected when a bending vibration of an (m+1)-order vibration mode is excited at the optical low-pass filter 410. Then, the foreign substance removal apparatus calculates main driving parameters for use in a main driving operation based on the detected time phase difference.
Claims14
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.
4 more elements
An optical 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 in 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.
4 more elements
Dependencies are inferred from the claim text.