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, 2001
Filed:
Aug. 12, 1999
Applicant:
Inventors:
Satoshi Sasaki, Tokyo, JP;
Masaru Abe, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B 3/5493 ; H01L 4/1187 ;
U.S. Cl.
CPC ...
C04B 3/5493 ; H01L 4/1187 ;
Abstract
Composition for piezoelectric ceramics includes a main component and a sub component. The main component is expressed with a general expression of aPb(Mg,Nb,)O,-bPb(Yb,Nb,)O,-cPbTiO,-dPbZrO,, where a+b+c+d=1, 0.01≦a≦0.07, 0.01≦b≦0.07, 0.35≦c≦0.55, and 0.4≦d≦0.6. The sub component contains 0.1 to 0.7 wt % of Mn in terms of manganese oxide, 0.01 to 0.3 wt % of Cr in terms of chromium oxide and 0.05 to 0.5 wt % of Co in terms of cobalt oxide per the weight of 1 mol of main component.