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. 20, 2009
Filed:
Nov. 30, 2007
Atsushi Yamamoto, Yasu, JP;
Yoichi Deguchi, Yasu, JP;
Koichi Hayashi, Kusatsu, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A piezoelectric device is formed by simultaneously firing a piezoelectric ceramic mainly composed of a perovskite complex oxide represented by general formula ABOand electrodes mainly composed of copper. The piezoelectric ceramic is represented by PbMe[(MM)TiZr]O(wherein Me represe element, Mis an acceptor element which is a divalent metal element, and Mis a donor element which is a pentavalent metal element), and satisfies equations 0.05≦z≦0.40, 0<bz/3≦0.035, 0.345≦x≦0.480, 0.965≦α≦1.020, and 0≦a≦0.05. In other words, the B sites contain excessive donors, and thus a piezoelectric device having good piezoelectric characteristics can be obtained even in the cases where a base metal material mainly composed of inexpensive copper is used as the internal electrode material.