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Title:
PIEZOELECTRIC ACTUATOR AND PIEZOELECTRIC ACTUATOR DRIVE METHOD
Document Type and Number:
WIPO Patent Application WO/2019/172064
Kind Code:
A1
Abstract:
This piezoelectric actuator comprises: a layered body including a plurality of flat electrodes and a plurality of piezoelectric ceramic layers, which have been layered; a low-potential external electrode provided on one of the end faces of the layered body; and a high-potential external electrode provided on the other end face of the layered body. The flat electrodes include low-potential flat electrodes connected electrically to the low potential external electrode and high-potential flat electrodes connected electrically to the high-potential external electrode, the low-potential flat electrodes and the high-potential flat electrodes being positioned alternately in the layering direction. On one of the main surfaces of the layered body, the flat electrode positioned on the outermost side is a low-potential flat electrode. The inner side of this low-potential flat electrode is in contact with the - side of the polarization of an active region, and the outer side of this low-potential flat electrode is exposed to the exterior. On the other main surface of the layered body, no high-potential flat electrode is exposed to the exterior.

Inventors:
YAMAKAWA YOSHIYUKI (JP)
GOTO SEISHIRO (JP)
KAWADA SHINICHIRO (JP)
HAYASHI SHIGETOSHI (JP)
FUJITA AKIO (JP)
NAKAMURA YUSUKE (JP)
Application Number:
JP2019/007771
Publication Date:
September 12, 2019
Filing Date:
February 28, 2019
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (Postcode6178555, JP)
International Classes:
H01L41/297; H01L41/083; H01L41/09; H01L41/187; H01L41/293
Domestic Patent References:
WO2013157293A12013-10-24
WO2016158762A12016-10-06
WO2016031302A12016-03-03
Foreign References:
JP2015070136A2015-04-13
JP2011049352A2011-03-10
JP2005285817A2005-10-13
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (Postcode5320003, JP)
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