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:
Dec. 11, 2007
Filed:
Nov. 22, 2004
Kazuhiro Okuda, Katano, JP;
Yasushi Goto, Ikeda, JP;
Seiichi Minami, Sapporo, JP;
Hiroki Moriwaki, Sanda, JP;
Kazuhiro Okuda, Katano, JP;
Yasushi Goto, Ikeda, JP;
Seiichi Minami, Sapporo, JP;
Hiroki Moriwaki, Sanda, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A piezoelectric ceramic compound expressed by a basic formula of Pb(ZnNb)ZrTiO(where 0.90<a+x+y<1.00) is provided. The starting materials for the piezoelectric ceramic compound are calcined. The calcined material is milled to provide powder. A formed body containing the powder is provided. The formed body is degreased at a temperature having the formed body not sintered. A sintered body is provided by sintering the degreased body. The sintered body is heated to subject the sintered body to predetermined heat treatment. The sintered body subjected to the predetermined heat treatment is polarized to provide the sintered body with a piezoelectric property, thus providing a piezoelectric ceramic device. This piezoelectric ceramic composition can be sintered together with an electrode consisting mainly of Ag at a low temperature. Even after the sintering, the composition has its insulation resistance not decrease and has its piezoelectric properties not decline. The piezoelectric ceramic composition has its insulation resistance not decrease even in high-temperature and high-humidity condition, thus having stable characteristics.