Panasonic Intellectual Property Management Co., Ltd.

Yudai Ishizaki

Hidetomo Nagahara

Tomoki Masuda

Masato Satou

Kenji Yasuda

Hiroshi Nakai

Yuuji Nakabayashi

Masanobu Teraji

Teraji Masanobu

There are provided piezoelectric element, case having conductivity, first acoustic matching layer bonded on case, and second acoustic matching layer stacked on and bonded to first acoustic matching layer. A joining part between first acoustic matching layer and second acoustic matching layer is located inside an outer periphery of a joining surface of first acoustic matching layer that is joined to second acoustic matching layer. This configuration can prevent indirect wave generated in first acoustic matching layer from propagating to second acoustic matching layer, and can therefore reduce reverberation of an ultrasonic wave.

Ultrasonic transceiver including piezoelectric element and stacked layers of a plurality of matching layers, and ultrasonic flow meter having the ultrasonic transceiver

Ultrasonic sensor () includes piezoelectric element (), first acoustic matching layer (), and second acoustic matching layer () which are laminated and bonded together, piezoelectric element () having a rectangular bonding surface. First acoustic matching layer (), which is adjacent to piezoelectric element (), is bonded to piezoelectric element () using thermoplastic resin injected from a thickness direction of first acoustic matching layer () in a manner that a flow direction of the thermoplastic resin matches a longitudinal direction of piezoelectric element (). With this configuration, ultrasonic sensor () that exhibits excellent temperature characteristics against such as thermal shock is provided.

Ultrasonic sensor

Flow sensor

An ultrasonic transceiver includes: a piezoelectric body including opposing surfaces having a first electrode and a second electrode respectively, piezoelectric body being segmented into a plurality of elements by a groove recessed from a surface having first electrode among the opposing surfaces; conductor electrically connected to first electrode on each of elements. The ultrasonic transceiver further includes reinforcement section provided in a part of second electrode, the part corresponding to a bottom of the groove. With this configuration, a decrease in a strength of piezoelectric body in the bottom of the groove, which is caused by a groove provided in piezoelectric body, can be prevented and occurrence of a crack can be prevented.

Ultrasonic transceiver

Growing community of inventors

Osaka-fu, Japan

Yudai Ishizaki