公开(公告)号：US20170067930A1

公开(公告)日：2017-03-09

申请号：US15257511

申请日：2016-09-06

Applicant: TDK CORPORATION

Inventor： Kazushi TACHIMOTO ,  Yoshikazu SHIMURA ,  Akira SUZUKI

IPC: G01P15/09

CPC classification number: G01P15/09

Abstract: An acceleration sensor capable of improving sensitivity is provided. In the acceleration sensor, although a solder fillet is formed in a lower end of a terminal electrode exposed from a covering portion, the covering portion suppresses the rise of the solder fillet. Due to this, the operation of the acceleration sensor is not easily limited by the solder fillet, and the acceleration sensor can generate electric charge which corresponds to a load more accurately. Therefore, the sensitivity of the acceleration sensor can be improved.

Abstract translation: 提供了能够提高灵敏度的加速度传感器。 在加速度传感器中，虽然在从覆盖部露出的端子电极的下端形成有焊料圆角，但是覆盖部也抑制焊锡片的上升。 由此，加速度传感器的操作不容易受到焊盘的限制，加速度传感器能够更精确地产生与负载对应的电荷。 因此，能够提高加速度传感器的灵敏度。

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：US20180233653A1

公开(公告)日：2018-08-16

申请号：US15894315

申请日：2018-02-12

Applicant: TDK CORPORATION

Inventor： Kaoru KIJIMA ,  Tatsuya TAKI ,  Kazushi TACHIMOTO ,  Toshiki MARUYAMA

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

CPC classification number: H01L41/0475 ,  H01L41/0471 ,  H01L41/0472 ,  H01L41/0474 ,  H01L41/0533 ,  H01L41/083 ,  H01L41/09 ,  H01L41/0973

Abstract: A vibrating device includes a diaphragm, a piezoelectric element, and a wiring board. The piezoelectric element and the wiring board are bonded to a first principal plane of the diaphragm. The wiring board is electrically connected with the piezoelectric element. The piezoelectric element includes a piezoelectric element body, a plurality of internal electrodes, and a plurality of external electrodes. The piezoelectric element body has a second principal plane, a third principal plane, and a side surface. The third principal plane and the side surface are bonded to the first principal plane. The wiring board has a resin film, a plurality of conductors, and a coating film. The coating film is disposed on the plurality of conductors in such a way as to cover the plurality of conductors. One end portions of the plurality of conductors are exposed from the coating film and electrically connected with corresponding external electrodes.

公开(公告)号：US20180233652A1

公开(公告)日：2018-08-16

申请号：US15894169

申请日：2018-02-12

Applicant: TDK CORPORATION

Inventor： Kaoru KIJIMA ,  Tatsuya TAKI ,  Kazushi TACHIMOTO

IPC: H01L41/047 ,  H01L41/083 ,  H01L41/187

CPC classification number: H01L41/0475 ,  H01L41/0474 ,  H01L41/0477 ,  H01L41/083 ,  H01L41/09 ,  H01L41/187

Abstract: A vibrating device includes a piezoelectric element, a wiring board electrically connected with the piezoelectric element, and a diaphragm including a metal. The piezoelectric element and the wiring board are bonded to the diaphragm. The piezoelectric element includes a piezoelectric element body, a plurality of internal electrodes, and a plurality of external electrodes. The piezoelectric element body has a first principal plane and a second principal plane opposed to each other. The plurality of internal electrodes is disposed in the piezoelectric element body. The internal electrodes are opposed to each other in a direction in which the first principal plane and the second principal plane are opposed. The plurality of external electrodes is disposed on the first principal plane, and is electrically connected with corresponding internal electrodes, of the plurality of internal electrodes. The wiring board has a resin film and a plurality of conductors.

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：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.

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.