Patent ID: 7642697
Filing Date: 2010-01-05
Classification: H01L,H02N

Abstract:
1. An ultrasonic motor comprising: a vibrating body having a piezoelectric element; a moving body which contacts the vibrating body; a first electrode or first electrodes provided at one side of the piezoelectric element, whereby the moving body or the vibrating body itself is driven in a first direction by a vibration caused on the vibrating body by applying a drive signal between the first electrode or first electrodes and a GND electrode provided at an other side of the piezoelectric element; and a second electrode or second electrodes provided at the one side of the piezoelectric element, whereby the moving body or the vibrating body itself is driven in a second direction by a vibration caused on the vibrating body by applying a drive signal between the second electrode or second electrodes and the GND electrode provided at the other side of the piezoelectric element, wherein a polarization direction of a portion of the piezoelectric element where the first electrode or the first electrodes are provided differs from a polarization direction of a portion of the piezoelectric element where the second electrode or the second electrodes are provided.