Patent ID: 6218769
Filing Date: 2001-04-17
Classification: H01L,H02N

Abstract:
An ultrasonic motor comprising: first piezoelectric oscillators alternately arranged with first polarized regions having a first direction of polarization and second polarized regions having a second direction of polarization opposite to the first direction of polarization, the first piezoelectric oscillators undergoing bending vibration in a first direction by inputting drive signals having a same phase to the first polarized regions and the second polarized regions to thereby excite the first polarized regions and the second polarized regions; and second piezoelectric oscillators laminated to the first piezoelectric oscillators in a second direction generally perpendicular to the first direction for undergoing elongation and contraction vibration in the first direction; wherein when a driving signal is applied to the first and second piezoelectric oscillators, a drive force is generated by a combination of the bending vibration of the first piezoelectric oscillators and the elongation and contraction vibration of the second piezoelectric oscillators.