公开(公告)号：US11930713B2

公开(公告)日：2024-03-12

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: H10N30/50 ,  H10N30/20 ,  H10N30/87 ,  H10N30/88

CPC classification number: H10N30/508 ,  H10N30/206 ,  H10N30/871 ,  H10N30/88

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：US11665967B2

公开(公告)日：2023-05-30

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

CPC classification number: H10N30/2047 ,  H10N30/50

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：US11581479B2

公开(公告)日：2023-02-14

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.