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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.:

US 12457902 B1

PDFFull Text
Date of Patent:
Oct. 28, 2025

Filed:

Mar. 15, 2022

Piezoelectric element

Applicant:

Murata Manufacturing Co., Ltd., Nagaokakyo, JP;

Inventors:

Yutaka Kishimoto, Nagaokakyo, JP;

Shinsuke Ikeuchi, Nagaokakyo, JP;

Masayuki Suzuki, Nagaokakyo, JP;

Fumiya Kurokawa, Nagaokakyo, JP;

Assignee:

MURATA MANUFACTURING CO., LTD., Kyoto, JP;

Attorney:

Keating & Bennett, LLP

Primary Examiner:

Emily P Pham

Assistant Examiner:

Monica undefined Mata

Int. Cl.
CPC ...
H01L 41/09 (2006.01); H01L 41/047 (2006.01); H01L 41/187 (2006.01); H01L 41/29 (2013.01); H01L 41/332 (2013.01); H10N 30/06 (2023.01); H10N 30/082 (2023.01); H10N 30/20 (2023.01); H10N 30/853 (2023.01); H10N 30/87 (2023.01);
U.S. Cl.
CPC ...
H10N 30/2047 (2023.02); H10N 30/06 (2023.02); H10N 30/082 (2023.02); H10N 30/8542 (2023.02); H10N 30/87 (2023.02);
Abstract

A piezoelectric element includes a piezoelectric layer, a first electrode layer, a second electrode layer, and a connecting electrode. The piezoelectric layer includes first and second surfaces, and a through-hole. The second electrode layer is adjacent to the second surface of the piezoelectric layer. The second electrode layer faces the through-hole. The second electrode layer includes silicon as a major component. The connecting electrode is on a connecting surface of the second electrode layer, and the connecting surface faces the through-hole. The connecting electrode is made of a metal. A surface roughness of the connecting surface is greater than a surface roughness of a major surface. The major surface is a portion, other than the connecting surface, of a surface of the second electrode layer, and the surface is adjacent to the piezoelectric layer.

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