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:
Oct. 02, 2007
Filed:
Dec. 07, 2005
Keiichi Umeda, Omihachiman, JP;
Osamu Nakagawara, Ritto, JP;
Keiichi Umeda, Omihachiman, JP;
Osamu Nakagawara, Ritto, JP;
Abstract
A piezoelectric thin-film resonator includes a first excitation electrode and a second excitation electrode, the first excitation electrode being disposed opposite the second excitation electrode; a piezoelectric thin film disposed between the first excitation electrode and the second excitation electrode; and a substrate supporting the first excitation electrode, the substrate being composed of a LiTaOsingle crystal or a LiNbOsingle crystal, the first excitation electrode including an acoustic reflecting layer, the acoustic reflecting layer containing (a) at least one epitaxially grown first sublayer being composed of a conducting material and having a relatively high acoustic impedance; and (b) at least one epitaxially grown second sublayer being composed of another conducting material and having a relatively low acoustic impedance.