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:
Mar. 18, 2008
Filed:
Jun. 22, 2007
Koji Ogiso, Moriyama, JP;
Atsushi Yamamoto, Yasu, JP;
Koichi Hayashi, Kusatsu, JP;
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Abstract
A piezoelectric ceramic composition has the composition formula (PbMe){(NiZnNb)TiZr}O, wherein Me represents at least one element selected from the group consisting of Ba, Sr and Ca; a, b, d, and x satisfy the inequalities 0.975≦a≦0.998, 0≦b≦0.05, 1<d≦1.3, and 0.39≦x≦0.47; and c and z are located in a region surrounded by lines connecting Point A (z=0.25, c=0.1), Point B (z=0.25, c=0.85), Point C (z=0.1, c=0.6), Point D (z=0.075, c=0.5), Point E (z=0.05, c=0.2), and Point F (z=0.05, c=0.1) or located on the lines in the z-c plane. Therefore, the piezoelectric ceramic composition is effective in achieving a large piezoelectric constant, a small dielectric constant, and a high Curie point. A piezoelectric actuator contains the piezoelectric ceramic composition.