Piezoelectric actuator for an ultrasonic motor
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United States of America Patent
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Dec 10, 2013
Grant Date -
Jan 21, 2010
app pub date -
Jul 31, 2006
filing date -
Aug 19, 2005
priority date (Note) -
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Abstract
A piezoelectric actuator, especially for an ultrasonic motor, includes an acoustic oscillation resonator, wherein the acoustic oscillation resonator is substantially formed as a rectangular piezoelectric plate with two main surfaces, two side surfaces and two end faces and has a multilayer structure in its interior which represents a layer of excitation electrodes taking turns with the layers of the common electrodes and the layers of polarized ceramic provided therebetween, with the polarization vector extending perpendicularly with respect to the surface of the electrodes, wherein all excitation electrodes are divided into two groups not connected to each other, which are disposed symmetrically with respect to the symmetry surface of the aforementioned plate, wherein this symmetry surface extends perpendicularly with respect to the main and side surfaces of the plate, namely through the center thereof.
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