Ultrasonic vibrator and a method of controllingly driving same
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United States of America Patent
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Mar 14, 1989
Grant Date -
N/A
app pub date -
Apr 3, 1987
filing date -
Apr 9, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ultrasonic vibrator comprises torsional electrostrictive transducers for torsional vibration, longitudinal electrostrictive transducers for longitudinal vibration, and two metallic members firmly, coaxially and integrally holding the torsional electrostrictive transducers and the longitudinal electrostrictive transducers therebetween. An altered section is formed in one of the metallic members in such a shape that makes the torsional resonant frequency and the longitudinal resonant frequency coincide with each other. A voltage or an electric current having a controlled amplitude and/or a controlled relative phase is applied to the electrostrictive transducers to generate composite vibrations of various modes.
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