公开(公告)号：EP4443907A1

公开(公告)日：2024-10-09

申请号：EP22898235.1

申请日：2022-10-04

申请人： Murata Manufacturing Co., Ltd.

发明人： KORESAWA, Kenji ,  SUZUKI, Yusuke ,  NOMURA, Junichi ,  MATSUSHITA, Tomoaki ,  FUJITA, Akio ,  FUJII, Kazuhiko

IPC分类号： H04R17/00 ,  H10N30/88 ,  H10N30/60 ,  H10N30/20 ,  H10N30/30 ,  H10N30/853 ,  C04B35/491

CPC分类号： C04B35/491 ,  H04R17/00 ,  H10N30/20 ,  H10N30/30 ,  H10N30/853 ,  H10N30/88 ,  H10N30/60

摘要： A case (120), a piezoelectric vibrator (110), and a wire (130, 140) are provided. The case (120) has a bottomed cylindrical shape, the case having a bottom portion and a side wall portion. The piezoelectric vibrator (110) has piezoelectric ceramic containing Ti and Zr, and is attached to the bottom portion inside the case (120). The wire (130, 140) is connected to the piezoelectric vibrator (110) and disposed to extend to an outside of the case (120). A resonance frequency in a spreading vibration mode of the piezoelectric ceramic not attached to the bottom portion becomes minimum at a temperature in a range of -30°C or higher and 10°C or lower. A cross-sectional porosity in any longitudinal cross section of the piezoelectric ceramic is 1% or less.

公开(公告)号：EP3848986B1

公开(公告)日：2023-09-27

申请号：EP19856893.3

申请日：2019-08-01

发明人： OGASAHARA, Ken ,  SHIMIZU, Satoshi ,  KAWATO, Susumu ,  NISHIKAWA, Kousuke

IPC分类号： H10N30/60 ,  H10N30/857 ,  H10N30/30 ,  H10N30/87

公开(公告)号：EP3729823B1

公开(公告)日：2023-09-27

申请号：EP18890815.6

申请日：2018-12-20

发明人： FISHMAN, Lawrence ,  LIN, Ching-Yu

IPC分类号： G01V1/18 ,  G01V1/20 ,  H04R1/44 ,  H04R17/02 ,  H04R31/00 ,  H10N30/045 ,  H10N30/60 ,  H10N30/857