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. 22, 2003
Filed:
Feb. 07, 2001
Applicant:
Inventors:
Masakazu Hirose, Tokyo, JP;
Takeo Tsukada, Tokyo, JP;
Hitoshi Oka, Tokyo, JP;
Junji Terauchi, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B 3/5453 ; H01L 4/1187 ;
U.S. Cl.
CPC ...
C04B 3/5453 ; H01L 4/1187 ;
Abstract
Piezoelectric ceramics include a bismuth layer compound containing M , Bi, Ti, Ln and O, wherein M represents at least one element selected from the group consisting of Sr, Ba and Ca, and Ln represents at least one element selected from the group consisting of lanthanoids. The piezoelectric ceramics include M Bi Ti O typed crystals, and a mole ratio of Ln/(Ln+M ) is 0<Ln/(Ln+M )<0.5. In the case where M is Sr, a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030. Preferably, piezoelectric ceramics further include Y oxide.