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:
Jul. 02, 2002
Filed:
Nov. 16, 2000
Applicant:
Inventors:
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 4/1107 ; C04B 3/5219 ;
U.S. Cl.
CPC ...
H01L 4/1107 ; C04B 3/5219 ;
Abstract
The piezoelectric ceramic includes oxide represented by (Pb A ) [Zn Nb ) (Mn B ) Ti Zr ]O . A represents at least one element in the group comprising Ca, Sr and Ba. B represents at least one element in the group comprising Nb, Sb and Ta and a, s, w, x, y and z are within a range of 0≦a≦0.1, 0.9≦s<1.0, 0.2≦w/x≦3.0, 0.1≦y≦0.5 and 0.2≦z≦0.6, respectively and w+x+y+z=1. Therefore, the high mechanical strength can be attained easily and reasonably and also the excellent piezoelectric properties are attained without grinding calcined powder or a hot press.