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. 27, 2012
Filed:
Feb. 28, 2005
Applicants:
Masakazu Hirose, Tokyo, JP;
Tomohisa Azuma, Tokyo, JP;
Norimasa Sakamoto, Tokyo, JP;
Inventors:
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B 35/00 (2006.01); C04B 35/495 (2006.01); H01L 41/18 (2006.01); H01L 41/187 (2006.01);
U.S. Cl.
CPC ...
Abstract
A piezoelectric ceramic composition excellent in all of the electric property Q, heat resisting properties and temperature characteristics of oscillation frequencies is provided. The piezoelectric ceramic composition comprises a phase mainly comprising lead zirconate titanate having a perovskite structure and an Al-containing phase. In the piezoelectric ceramic composition, the main component preferably comprises Mn and Nb, and is preferably represented by a composition formula of Pb[(MnNb)TiZr]O(wherein 0.97≦α≦1.01, 0.04≦x≦0.16, 0.48≦y≦0.58, 0.32≦z≦0.41).