Piezoelectric vibrator and ultrasonic motor having piezoelectric vibrator
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United States of America Patent
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-
Jan 12, 2010
Grant Date -
Dec 21, 2006
app pub date -
May 19, 2006
filing date -
May 20, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A piezoelectric vibrator and an ultrasonic motor having the piezoelectric vibrator. A piezoelectric vibrator has a multilayered piezoelectric actuator, with special internal and surface electrodes making the body vibrate in a longitudinal and bending direction when an electrical signal is inputted. It can be manufactured using conventional multilayer piezoelectric actuator manufacturing techniques, therefore, it has reduced manufacturing time and cost, as it is not necessary to go through two polarization processes, and may simplify and decrease the volume, while improving the vibration performance.
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