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：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.