Title:
【発明の名称】圧電変換素子
Document Type and Number:
Japanese Patent JP2745147
Kind Code:
B2
Abstract:
A piezoelectric transducer having electrodes formed on both surfaces has a piezoelectric base molded as a curved plate which can converge sound fields of acoustic waves at an arbitrary point and which can reduce noise or reverberation in a lateral direction which otherwise occur due to unnecessary vibration. At least one of the electrodes is divided concentrically. A material having a small electromechanical coupling factor Kp in the lateral direction is used for the piezoelectric material, preferably porous PZT.
Inventors:
Kanai Harumi
Yoshiaki Tanaka
Kazuyasu Hikita
Yoshiaki Tanaka
Kazuyasu Hikita
Application Number:
JP7629489A
Publication Date:
April 28, 1998
Filing Date:
March 27, 1989
Export Citation:
Assignee:
Mitsubishi Materials Corporation
International Classes:
G01N29/24; A61B8/00; B06B1/06; H04R17/00; (IPC1-7): H04R17/00; A61B8/00; G01N29/24
Domestic Patent References:
| JP61146098A | ||||
| JP56141700A | ||||
| JP6199496A | ||||
| JP55166980A | ||||
| JP62131700A |
Attorney, Agent or Firm:
Naotaka Ide