The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 2020
Filed:
Mar. 29, 2017
Applicant:
Ngk Insulators, Ltd., Nagoya-Shi, JP;
Inventors:
Assignee:
NGK Insulators, Ltd., Nagoya-Shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 41/187 (2006.01); B32B 18/00 (2006.01); C04B 35/491 (2006.01); H01L 41/047 (2006.01); H01L 41/09 (2006.01); H01L 41/113 (2006.01);
U.S. Cl.
CPC ...
H01L 41/1876 (2013.01); B32B 18/00 (2013.01); C04B 35/491 (2013.01); H01L 41/0471 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3234 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/3249 (2013.01); C04B 2235/3251 (2013.01); C04B 2235/3262 (2013.01); C04B 2235/3279 (2013.01); C04B 2235/3281 (2013.01); C04B 2235/3284 (2013.01); C04B 2235/3296 (2013.01); C04B 2235/3418 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/6025 (2013.01); C04B 2235/75 (2013.01); C04B 2235/80 (2013.01); C04B 2235/85 (2013.01); C04B 2235/96 (2013.01); C04B 2237/346 (2013.01); C04B 2237/68 (2013.01); H01L 41/09 (2013.01); H01L 41/113 (2013.01);
Abstract
A piezoelectric element includes a piezoelectric body having a main phase configured by lead zirconate titanate and a heterogenous phase configured by a different component to lead zirconate titanate, and a pair of electrodes provided on the piezoelectric body. The piezoelectric body has a surface region within 10 μm of a surface, and an inner region more than 10 μm from the surface. A surface area coverage of the heterogenous phase in a cross section of the surface region is at least 0.75% greater than a surface area coverage of the heterogenous phase in a cross section of the inner region.