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：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：US20220209096A1

公开(公告)日：2022-06-30

申请号：US17531976

申请日：2021-11-22

Applicant: TDK CORPORATION

Inventor： Keisuke TERANISHI ,  Hiroki MITSUI ,  Miho KATO ,  Hideya SAKAMOTO ,  Narumi SATO

IPC: H01L41/047 ,  H01L41/053 ,  H01L41/09

Abstract: The vibration device includes a piezoelectric element having a connection terminal exposed from a main surface of the piezoelectric element, a first resin layer having conductivity and covering the connection terminal of the piezoelectric element to be electrically connected to the connection terminal, a wiring member overlapping the main surface of the piezoelectric element to cover the first resin layer, including a wire electrically connected to the first resin layer, and extending beyond one end of the piezoelectric element when viewed in a thickness direction of the piezoelectric element, and a second resin layer integrally covering the main surface of the piezoelectric element and the wiring member. The second resin layer includes a first layer in direct contact with the piezoelectric element and the wiring member, and a second layer covering the piezoelectric element and the wiring member via the first layer.

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.

公开(公告)号：US20200282426A1

公开(公告)日：2020-09-10

申请号：US16759593

申请日：2018-10-25

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Kazushi TACHIMOTO ,  Hideya SAKAMOTO ,  Tetsuyuki TANIGUCHI ,  Tatsuya TAKI ,  Tomohiro TAKEDA ,  Akihiro TAKEDA

IPC: B06B1/06 ,  H01L41/047 ,  H01L41/083 ,  H01L41/09

Abstract: A piezoelectric element includes a piezoelectric element body including a first principal surface and a second principal surface opposing each other, and a plurality of external electrodes disposed on the first principal surface. A vibration member includes a third principal surface opposing the second principal surface. The piezoelectric element is joined to the third principal surface. A wiring member is electrically connected to the piezoelectric element. The wiring member includes a region located on the plurality of external electrodes and joined to the plurality of external electrodes. The region of the wiring member monolithically covers the plurality of external electrodes when viewed from a direction orthogonal to the first principal surface.

公开(公告)号：US20190312190A1

公开(公告)日：2019-10-10

申请号：US16373749

申请日：2019-04-03

Applicant: TDK CORPORATION

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

IPC: H01L41/083 ,  H01L41/047 ,  H01L41/053 ,  H01L41/09

Abstract: A piezoelectric element includes a piezoelectric body, an electrode layer, and a reinforcing layer. The piezoelectric body has a first main surface, a second main surface, and a side surface. The first main surface and the second main surface oppose each other. The side surface extends in an opposing direction in which the first main surface and the second main surface oppose each other in such a way as to connect the first main surface and the second main surface. The electrode layer is provided in the piezoelectric body. The reinforcing layer is provided on the first main surface. The electrode layer is provided opposing the first main surface and apart from the side surface. When viewed from the opposing direction, the electrode layer has a corner. When viewed from the opposing direction, the reinforcing layer overlaps the corner.

公开(公告)号：US20190088851A1

公开(公告)日：2019-03-21

申请号：US16128887

申请日：2018-09-12

Applicant: TDK CORPORATION

Inventor： Yoshiki OHTA ,  Tetsuyuki TANIGUCHI ,  Hideya SAKAMOTO ,  Kazushi TACHIMOTO ,  Junpei KIKUCHI ,  Akihiro TAKEDA

IPC: H01L41/083 ,  H01L41/277 ,  H01L41/047 ,  H01L41/053 ,  H01L41/09

Abstract: A multilayer piezoelectric element includes a piezoelectric element body, a first internal electrode and a second internal electrode, a plurality of first connecting conductors, a plurality of second connecting conductors, and an external member. The piezoelectric element body is formed by laminating a plurality of piezoelectric element body layer. The piezoelectric element body includes a first main surface and a second main surface, and a side surface. The plurality of first connecting conductors are connected to the first internal electrode. The plurality of second connecting conductors are connected to the second internal electrode. The external member is conductive and is bonded to the first main surface in such a way as to cover the first end portions of the plurality of first connecting conductors. The external member is electrically connected to the plurality of first connecting conductors.