Ultrasonic vibrator and its drive control method
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United States of America Patent
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-
Oct 27, 1987
Grant Date -
N/A
app pub date -
Sep 30, 1986
filing date -
Nov 27, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an ultrasonic vibrator, a plurality of electrode pairs, each including electrodes halved on one surface, are arranged in the circumferential direction so as to constitute an electrostrictive element. The electrostrictive element is held and tightened by a vibrator and a metal member. The vibrator is provided with foot portions divided in a number of divisions coincident with the number of the electrode. The halved electrodes of the electrode pairs are connected while parallel in matching with the circumferential position, and AC voltages controlled in relative phase or relative amplitude are applied to respective electrodes. Various vibrations are generated in the vibrator, and the elliptic rate can be controlled during control of the vibration direction or generation of elliptic vibration.
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