公开(公告)号：US20180013056A1

公开(公告)日：2018-01-11

申请号：US15640747

申请日：2017-07-03

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Satoshi SASAKI ,  Yoshiaki OHTA ,  Takahiro KEZUKA ,  Katsuya INABA ,  Rin SATO ,  Kazushi TACHIMOTO ,  Masayoshi INOUE ,  Yuzo KOMATSU

IPC: H01L41/083

CPC classification number: H01L41/0838 ,  H01L41/0471 ,  H01L41/0472

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.

公开(公告)号：US20180219494A1

公开(公告)日：2018-08-02

申请号：US15884785

申请日：2018-01-31

Applicant: TDK CORPORATION

Inventor： Yasuyuki SATOH ,  Katsumi YAMAUCHI ,  Katsuya INABA ,  Yoko ABE

IPC: H02N2/00 ,  H01L41/047

CPC classification number: H02N2/0015 ,  H01L41/047 ,  H01L41/0471 ,  H01L41/0472 ,  H01L41/083 ,  H01L41/293

Abstract: A piezoelectric actuator (1) includes: a piezoelectric element (3); and a first frictional portion (10) and a second frictional portion (12) that are disposed on one principal surface (2d) of the piezoelectric element (3). The first frictional portion (10) is disposed at a position other than the antinodes of the piezoelectric element (3) at which a distance from one of the end surfaces (2a) is less than ⅓ L, where L represents a length in the longitudinal direction of the piezoelectric element (3). The second frictional portion (12) is disposed at a position other than the antinodes of the piezoelectric element (3) at which a distance from the other of the end surfaces (2b) is less than ⅓ L.