公开(公告)号：US20220352454A1

公开(公告)日：2022-11-03

申请号：US17615574

申请日：2020-05-25

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Jun SUGAWARA ,  Kenichiro ANDOU ,  Nana SATO ,  Akihiro TAKEDA

IPC: H01L41/047 ,  H01L41/113 ,  H01L41/257

Abstract: A piezoelectric element includes a piezoelectric body including a piezoelectric material, and a first electrode and a second electrode provided on the piezoelectric body. The piezoelectric body includes a base and a plurality of drivers. The base includes a first main surface and a second main surface opposing each other. The plurality of drivers is arranged on the first main surface in such a way as to be separate from each other. Each of the plurality of drivers includes a third main surface contacting the first main surface and a fourth main surface opposing the third main surface. The base includes a plurality of first regions in which the plurality of drivers is provided and a second region provided between the first regions adjacent to each other. The base is curved.

公开(公告)号：US20200321513A1

公开(公告)日：2020-10-08

申请号：US16957191

申请日：2018-12-12

Applicant: TDK CORPORATION

Inventor： Yoshikazu SHIMURA ,  Kaoru KIJIMA ,  Hideya SAKAMOTO ,  Kazushi TACHIMOTO ,  Ryuhei SASAKI ,  Yoshiki OHTA ,  Akihiro TAKEDA

IPC: H01L41/083 ,  H01L41/047

Abstract: In a piezoelectric element, shift of a resonance point to a low-pitched sound side is achieved. A resonance point of a piezoelectric element moves to a low-pitched sound side when an active region is configured to be surrounded by an inactive region as in the configuration of the piezoelectric element. According to the piezoelectric element whose resonance point is moved to a low-pitched sound side, the piezoelectric element can realize a sound pressure that is sufficiently high for practical use when it is applied to an acoustic device.

公开(公告)号：US20220070575A1

公开(公告)日：2022-03-03

申请号：US17424257

申请日：2020-01-20

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Takuto HORII ,  Yoshikazu SHIMURA ,  Atsushi EZAWA ,  Miho BAMBA ,  Kaoru KIJIMA ,  Akihiro TAKEDA

IPC: H04R1/24 ,  H01L41/047 ,  H01L41/083 ,  H04R17/00 ,  H04R7/04

Abstract: An audio device includes a vibration member, and a first piezoelectric vibrator and a second piezoelectric vibrator that are provided on the vibration member. A natural frequency of the first piezoelectric vibrator is larger than a natural frequency of the second piezoelectric vibrator.

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：US20200212285A1

公开(公告)日：2020-07-02

申请号：US16815231

申请日：2020-03-11

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Hideya SAKAMOTO ,  Kazushi TACHIMOTO ,  Nobuo FURUKAWA ,  Akihiro TAKEDA

IPC: H01L41/047 ,  H01L41/083

Abstract: A piezoelectric element includes a piezoelectric body layer, a first electrode, a second electrode, a third electrode, and a conductor. The piezoelectric body layer has rectangular first and second principal surfaces opposing each other, and includes a piezoelectric material. The first electrode is provided on the first principal surface. The second electrode is provided on the first principal surface in such a way that the second electrode is separated from the first electrode. The third electrode is provided on the second principal surface in such a way that the third electrode opposes the first electrode. The conductor is connected to the second electrode and the third electrode. The first electrode has a round corner being rounder than a corner part of the piezoelectric body layer when seen in an opposing direction of the first and second principal surfaces.

公开(公告)号：US20180090667A1

公开(公告)日：2018-03-29

申请号：US15720288

申请日：2017-09-29

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Hideya SAKAMOTO ,  Kazushi TACHIMOTO ,  Nobuo FURUKAWA ,  Akihiro TAKEDA

IPC: H01L41/083 ,  H01L41/047

CPC classification number: H01L41/0838 ,  H01L41/0471 ,  H01L41/0474 ,  H01L41/0477 ,  H01L41/096 ,  H01L41/1871 ,  H01L41/1873 ,  H01L41/1875 ,  H01L41/1876 ,  H01L41/1878

Abstract: A piezoelectric element includes first and second electrodes, a first piezoelectric body layer, and a plurality of first through-hole conductors. The first and second electrodes oppose each other. The first piezoelectric body layer is disposed between the first electrode and the second electrode. The plurality of first through-hole conductors penetrates the first piezoelectric body layer and is connected to the first electrode and the second electrode. When seen in an opposing direction of the first and second electrodes, the plurality of first through-hole conductors is arrayed in a matrix.

公开(公告)号：US20180090665A1

公开(公告)日：2018-03-29

申请号：US15704605

申请日：2017-09-14

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Hideya SAKAMOTO ,  Kazushi TACHIMOTO ,  Nobuo FURUKAWA ,  Akihiro TAKEDA

IPC: H01L41/047

CPC classification number: H01L41/0475 ,  H01L41/0471 ,  H01L41/0838

Abstract: A piezoelectric element includes a piezoelectric body layer, a first electrode, a second electrode, a third electrode, and a first through-hole conductor. The piezoelectric body layer has rectangular first and second principal surfaces opposing each other, and includes a piezoelectric material. The first electrode is provided on the first principal surface. The second electrode is provided on the first principal surface in such a way that the second electrode is separated from the first electrode. The third electrode is provided on the second principal surface in such a way that the third electrode opposes the first electrode. The through-hole conductor penetrates the piezoelectric body layer and is connected to the second electrode and the third electrode. The first electrode has a round corner when seen in an opposing direction of the first and second principal surfaces.

公开(公告)号：US20170358733A1

公开(公告)日：2017-12-14

申请号：US15616127

申请日：2017-06-07

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Masaichi MIYANO ,  Keiji OGUCHI

IPC: H01L41/27 ,  H01L41/187 ,  H01L41/113 ,  H01L41/29 ,  H01L41/297 ,  H01L41/083 ,  B06B1/06

Abstract: A piezoelectric device includes a body provided with a first region and a second region lined along a first direction. The first region deformably extends/contracts along the first direction. The second region deformably curves in such a manner that one or the other side in a second direction intersecting the first direction curves outward.

公开(公告)号：US20220288637A1

公开(公告)日：2022-09-15

申请号：US17674102

申请日：2022-02-17

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Mikio SUMIYOSHI ,  Nana SATO ,  Mitsunao HOMMA ,  Hiroyuki IJIRI

IPC: B06B1/06 ,  G01S7/521 ,  G10K11/00

Abstract: An ultrasonic transducer includes a case, a piezoelectric element, a wiring member, a foaming member, and a vibration damping material. The case includes a bottom wall. The piezoelectric element is disposed on the bottom wall inside the case. The wiring member is electrically connected to the piezoelectric element. The foaming member is disposed on the piezoelectric element. The vibration damping material is disposed between the piezoelectric element and the foaming member. The foaming member has a bottom surface opposing the piezoelectric element in a thickness direction of the piezoelectric element. A plurality of depressions is formed on the bottom surface. The vibration damping material bonds the piezoelectric element and the bottom surface.

公开(公告)号：US20210384409A1

公开(公告)日：2021-12-09

申请号：US16957241

申请日：2018-10-25

Applicant: TDK CORPORATION

Inventor： Ryuhei SASAKI ,  Yoshikazu SHIMURA ,  Yoshiki OHTA ,  Kazushi TACHIMOTO ,  Hideya SAKAMOTO ,  Tetsuyuki TANIGUCHI ,  Akihiro TAKEDA

IPC: H01L41/09

Abstract: A vibration device includes a piezoelectric vibrator having a piezoelectric element and a diaphragm having a pair of main surfaces facing each other, the piezoelectric element being bonded to the main surface, a vibration member where the piezoelectric vibrator is disposed, and an adhesive member disposed between the diaphragm and the vibration member and bonding the diaphragm and the vibration member. Each of the pair of main surfaces of the diaphragm has a rectangular shape when viewed from a facing direction of the pair of main surfaces, and the adhesive member is disposed in a facing manner on at least a pair of sides of the main surfaces.