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:
Apr. 10, 2012
Filed:
Oct. 21, 2008
Kazunori Nishimura, Kyoto, JP;
Hiroyuki Nakamura, Osaka, JP;
Hidekazu Nakanishi, Osaka, JP;
Ryouichi Takayama, Osaka, JP;
Takashi Inoue, Osaka, JP;
Kazunori Nishimura, Kyoto, JP;
Hiroyuki Nakamura, Osaka, JP;
Hidekazu Nakanishi, Osaka, JP;
Ryouichi Takayama, Osaka, JP;
Takashi Inoue, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A boundary acoustic wave device includes a first medium layer made of piezoelectric material, a second medium layer provided on the first medium layer, a third medium layer provided on the second medium layer, and an electrode provided at an interface between the second and third medium layers. The electrode drives the third medium layer to generate a transverse wave. A propagation speed of the transverse wave in the third medium layer is lower than a propagation speed of the transverse wave in the first medium layer. A propagation speed of the transverse wave in the second medium layer is lower than the propagation speed of the transverse wave in the first medium layer. This boundary acoustic wave device has a large electro-mechanical coupling coefficient.