Piezoelectric device, piezoelectric actuator, hard disk drive, and inkjet printer apparatus
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United States of America Patent
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Apr 4, 2017
Grant Date -
Aug 13, 2015
app pub date -
Feb 10, 2014
filing date -
Feb 10, 2014
priority date (Note) -
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Abstract
A piezoelectric device is provided with a piezoelectric element including a piezoelectric layer exhibiting a polarizability γ smaller than 1×10−9 (C/(V·m)) in the case where an electric field is applied until polarization is saturated and a circuit having a means to set a minimum value of a drive electric field to become larger than a positive coercive electric field of the above-described piezoelectric layer and a means to set a maximum value of the above-described drive electric field to become smaller than (Pm′(maximum value of polarization)−Pr′(quasi-remanent polarization))/(1×10−9) and, therefore, an object is to drive the piezoelectric element in an electric field range in which maximum piezoelectric characteristics are obtained, improve the characteristics of the piezoelectric device, and enhance the reliability.
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