JP2007202340A5 - - Google Patents

Claims (9)

In the drive device using the vibration generated in the vibrating body as a drive source,
By generating a plurality of vibration displacements on the vibrating body to generate a combined vibration in the vibrating body,
A plurality of contact bodies in contact with the vibrating body are driven by a combined vibration composed of a plurality of vibration displacements of the same combination, and the relative combination of the plurality of contact bodies is changed by changing the combination of the plurality of vibration displacements. Drive device characterized by a change in general rotation direction. The drive device according to claim 1, wherein the plurality of contact bodies that are in contact with the vibrating body are relatively moved so that rotation axes are in the same direction. The vibration body includes: a rectangular parallelepiped elastic body; and an electro-mechanical energy conversion element that is fixed to a surface of the elastic body and generates the plurality of vibration displacements to be applied to the elastic body. The drive device according to 1. The elastic body of the vibrating body has a step portion on a side to which the electro-mechanical energy conversion element is fixed.
The drive device according to claim 2, wherein a plurality of the electro-mechanical energy conversion elements of the vibrating body are arranged with the stepped portion interposed therebetween. It is possible to degenerate at least two vibration modes of a first vibration mode and a second vibration mode having different vibration displacement directions, and to excite vibrations having different orders in at least the first vibration mode. drive device according to any one of claims 1 to 4,.   6. The driving device according to claim 5, wherein the two vibration modes are two vibration modes among low-order vibrations of a longitudinal vibration mode, a bending vibration mode, and a torsional vibration mode.   The first vibration mode and the second vibration mode are excited with a time phase to form an elliptical motion or a circular motion at a contact portion of the vibration body with the contact body. The drive device according to claim 5 or 6. The electro-mechanical energy conversion element includes an input unit to which a vibration excitation signal is input,
The frequency of the signal that excites vibrations having different orders in the first vibration mode that is input to the input unit of the electromechanical energy conversion element is the frequency of the signal that excites vibrations before the orders are different. drive apparatus according to any one of claims 3 to 7, characterized in that it is set to an integral multiple. A drive device that drives a plurality of contact bodies that are in contact with the vibrating body by generating a combined vibration in the vibrating body by applying at least two different vibration displacements to the vibrating body to which the electro-mechanical energy conversion element is fixed. In the control method of
A vibration is generated in the first vibration mode by inputting a first signal to the electromechanical energy conversion element, and a vibration is generated in the second vibration mode by inputting a second signal. A control method characterized in that a relative vibration direction of the plurality of contact bodies is changed by generating a combined vibration in the vibrator and changing at least the frequency of the first signal.