JP2005245055A5 - - Google Patents

Claims (6)

In the vibration wave driving device that generates an elliptical motion at the output portion of the vibrating body and generates a relative motion between the driven body and the driven body that is in contact with the output portion,
A vibrating body having a symmetrical shape with respect to a first symmetry plane of at least one symmetry plane;
A first vibration excitation means for exciting a first standing wave oscillation as the oscillation mode of the non-symmetrical figure with respect to the first plane of symmetry,
A second vibration excitation means for exciting the second standing wave oscillation as the oscillation mode of the symmetric figure and to said first plane of symmetry,
First and second detection means that are formed on the vibrating body at positions symmetric with respect to the first symmetry plane and detect the vibration state of the vibrating body;
An adder circuit for calculating a sum of detection signals respectively output from the first and second detection means;
A subtraction circuit for calculating a difference between detection signals respectively output from the first and second detection means;
And a control means for controlling the driving of the vibrating body based on the sum signal and the difference signal output from the adding circuit and the subtracting circuit, respectively. 2. The vibration wave driving device according to claim 1, wherein the second standing wave vibration is a vibration mode in a symmetric state with respect to a second symmetry plane orthogonal to the first symmetry plane. .   The first and second detection means are constituted by piezoelectric elements polarized in the same direction with respect to the thickness direction of the vibrating body, and the sum signal represents a vibration state of the second standing wave vibration. 3. The vibration wave driving device according to claim 1, wherein the difference signal represents a vibration state of the first standing wave vibration.   The first and second detection means are constituted by piezoelectric elements polarized in a direction opposite to the thickness direction of the vibrating body, and the sum signal represents a vibration state of the first standing wave vibration. 3. The vibration wave driving device according to claim 1, wherein the difference signal represents a vibration state of the second standing wave vibration.   The vibrating body includes an electro-mechanical energy conversion element that is excited by the first and second vibration excitation units, and the electro-mechanical energy conversion element has both the first and second detection units. The vibration wave driving device according to claim 1, wherein the vibration wave driving device is provided.   The vibration wave driving device according to claim 1, further comprising a phase difference detection unit that detects a phase difference between the sum signal and the difference signal and outputs the phase difference to the control unit.