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1. (WO2017031679) ULTRASONIC TRANSDUCER

Pub. No.:    WO/2017/031679    International Application No.:    PCT/CN2015/087981
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Wed Aug 26 01:59:59 CEST 2015
IPC: B06B 1/06
A61B 8/00
Applicants: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO., LTD.
深圳迈瑞生物医疗电子股份有限公司
Inventors: SI, Kang
司康
WU, Fei
吴飞
CHEN, Zhenyu
陈振宇
Title: ULTRASONIC TRANSDUCER
Abstract:
An ultrasonic transducer comprises a piezoelectric wafer (1) and backing layers, the backing layers including a high impedance backing layer (2a) and a low impedance backing layer (2b). The back surface of the piezoelectric wafer is connected with the front surface of the high impedance backing layer, and the back surface of the high impedance backing layer is connected with the front surface of the low impedance backing layer. High reflection is generated at the border of the high and low impedance backing layers, therefore more sonic waves are reflected to the piezoelectric wafer, improving the sensitivity of the ultrasonic transducer.