Title:
LAMINATED PIEZOELECTRIC ELEMENT
Document Type and Number:
WIPO Patent Application WO/2021/125097
Kind Code:
A1
Abstract:
This laminated piezoelectric element is provided with: a piezoelectric element body that includes a piezoelectric ceramic material; a first electrode; and a second electrode. The piezoelectric element body has a first main surface and a second main surface which oppose each other. The first electrode includes an external electrode formed on the first main surface. The second electrode includes an internal electrode formed in the piezoelectric element body so as to oppose the external electrode. The piezoelectric element body includes an active region between the external electrode and the internal electrode and includes an inactive region opposite to the active region across the internal electrode. Stress being applied to the piezoelectric element body from the external electrode is greater than that being applied to the piezoelectric element body from the internal electrode. The polarization direction of the active region is directed from the external electrode toward the internal electrode.
Inventors:
ONO SHUTO (JP)
Application Number:
PCT/JP2020/046375
Publication Date:
June 24, 2021
Filing Date:
December 11, 2020
Export Citation:
Assignee:
TDK CORP (JP)
International Classes:
H01L41/047; H01L41/083; H01L41/187; H01L41/257
Domestic Patent References:
| WO2006068245A1 | 2006-06-29 |
Foreign References:
| JP2007335664A | 2007-12-27 | |||
| JP2015072979A | 2015-04-16 | |||
| JP2012128907A | 2012-07-05 | |||
| JP2012134336A | 2012-07-12 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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