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:
May. 04, 2004
Filed:
Feb. 07, 2002
Toshikatsu Kashiwaya, Inazawa, JP;
Mutsumi Kitagawa, Nagoya, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A piezoelectric element includes a ceramic substrate, a piezoelectric portion made of a piezoelectric ceramic composition containing a PbMg Nb O —PbZrO —PbTiO ternary system solid solution composition having an average particle diameter of 1-10 &mgr;m with a maximum particle diameter being not more than 5 times as large as the average particle diameter including the chemical formula discussed below as a main component and the piezoelectric and the piezoelectric ceramic composition includes 0.05 to 10.0 mass % of NiO. An electrode is electrically connected to the piezoelectric portion, and the piezoelectric portion is solidly attached to the ceramic substrate directly or via the electrode. The piezoelectric ceramic composition is represented by the following general formula: Pb (Mg Nb ) Ti Zr O , wherein 0.95≦x≦1.05; 0.8≦y≦1.0; a, b and c are decimals falling in a range surrounded by (a,b,c)=(0.550, 0.425, 0.025), (0.550, 0.325, 0.125), (0.375, 0.325, 0.300), (0.100, 0.425, 0.475), (0.100, 0.475, 0.425) and (0.375, 0.425, 0.200) in the coordinates with coordinate axes of the a, b and c, and a−b+c=1.00.