Piezoelectric vibrator for ultrasonic motor
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United States of America Patent
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Apr 26, 2011
Grant Date -
Mar 25, 2010
app pub date -
Sep 23, 2008
filing date -
Sep 23, 2008
priority date (Note) -
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Abstract
In the invention, each piezoelectric element for a vibrator for an ultrasonic motor has electrode regions for exciting stretching vibration and flexural vibration separately. Thus, the invention provides a vibrator for an ultrasonic motor, in which electrodes are provided for applying voltage to each of the polarized region, and further provides a stack-type piezoelectric vibrator for an ultrasonic motor, consisting of a stack of the said vibrators and having an extraction electrode pattern provided for short circuit with an external electrode. The vibrator of the invention has high controllability, especially in a fine movement region and is useful as a driving source in a positioning device, in which enhanced vibration efficiency can be obtained.
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