The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 2004
Filed:
May. 07, 2003
Seigo Shiraishi, Neyagawa-shi, Osaka, JP;
Norihisa Takahara, Ibaraki-shi, Osaka, JP;
Masaaki Suzuki, Osaka-shi, Osaka, JP;
Kazuhiko Hashimoto, Moriguchi-shi, Osaka, JP;
Takashi Hashida, Osaka-shi, Osaka, JP;
Hidetomo Nagahara, Soraku-gun, Kyoto, JP;
Masahiko Hashimoto, Shijonawate-shi, Osaka, JP;
Other;
Abstract
An acoustic matching member that is incorporated into an ultrasonic transducer for transmitting and receiving ultrasonic waves, includes: at least two layers including a first layer and a second layer that have different acoustic impedance values from each other. The first layer is made of a composite material of a porous member and a filing material supported by void portions of the porous member, the second layer is made of the filling material or the porous member, and the first layer and the second layer are present in this stated order. A piezoelectric member is disposed on a side of the first layer of the acoustic matching member to form an ultrasonic transducer or an ultrasonic flowmeter. The acoustic matching member does not have independent intermediate layers between the layers, so that delamination hardly occurs and the difficulty in the designing associated with the presence of intermediate layers can be avoided.