| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic oscillator which can detect longitudinal oscillation and torsional oscillation separately. SOLUTION: The ultrasonic oscillator 10 comprises a prism resilient body 11, and multilayer piezoelectric elements 14a, 14b arranged to excite longitudinal and torsional oscillations simultaneously in the resilient body 11, wherein a piezoelectric element 17 for detecting oscillation secured to the resilient body 11 detects the longitudinal and torsional oscillation component voltages corresponding to the longitudinal and torsional oscillations of resilient body 11 and having a phase difference. |
