| 摘要 |
An ultrasonic motor, which rotates a rotor by elastic movement generated by simultaneously exciting vertical oscillation and twisted oscillation in an ultrasonic oscillator, by using expanding and contracting oscillations of a multilayer piezoelectric element formed by laminating two kinds of piezoelectric sheet, is configured as follows. Namely, the multilayer piezoelectric element is formed by alternately laminating a first piezoelectric sheet and a second piezoelectric sheet. The first piezoelectric sheet is provided with a first internal electrode, which is divided into two or more parts, and each divided part is exposed to a peripheral edge of the piezoelectric sheet. The second piezoelectric sheet is provided with an internal electrode, which has a polarity reverse to the first internal electrode, and is divided into two or more parts, and each divided part is exposed to a peripheral edge of the piezoelectric sheet.
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