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:
Jul. 07, 2020
Filed:
Jul. 03, 2017
Tdk Corporation, Tokyo, JP;
Yoshiki Ohta, Tokyo, JP;
Satoshi Sasaki, Tokyo, JP;
Yoshiaki Ohta, Tokyo, JP;
Takahiro Kezuka, Tokyo, JP;
Katsuya Inaba, Tokyo, JP;
Rin Sato, Tokyo, JP;
Kazushi Tachimoto, Tokyo, JP;
Masayoshi Inoue, Tokyo, JP;
Yuzo Komatsu, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
In a piezoelectric element, internal stress generated in an inactive portion at the time of sintering when a piezoelectric element is fabricated or stress applied from the outside to the inactive portion is absorbed by a recess of a lower surface of a first through hole conductor and a recess of an upper surface of a second through hole conductor. Accordingly, for example, deformation, rupture, or the like of the through hole conductor is prevented, and conduction failure or disconnection of an electrode layer or a through hole conductor is prevented. Further, in the inactive portion, since a protrusion of the piezoelectric layer enters the recess of the through hole conductor, a holding force of the piezoelectric layer with respect to the through hole conductor increases, and deformation of the through hole conductor is prevented or obstructed.