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. 16, 2006
Filed:
Dec. 27, 2001
Kazuhisa Kasukawa, Saitama, JP;
Kazutoshi Ohno, Saitama, JP;
Kazuhisa Kasukawa, Saitama, JP;
Kazutoshi Ohno, Saitama, JP;
Bosch Automotive Systems Corporation, Tokyo, JP;
Abstract
A ceramic material has piezoelectric characteristics, can be sintered at low temperature, and is suited to various piezoelectric devices. The ceramic material primarily includes Pb, Zr, and Ti and has the general formula ABO, in which A is (PbM), where Mis selected from the group consisting of group 3A elements, Li, Na, K, Mg, Ca, and Sr, and B is [(MNb)ZrTi], where Mis one or more elements capable of forming at least a perovskite structure in the ceramic material, or the formula PbM[(MNb)(CoNb)(ZnNb)ZrTi]O, where Mdenotes one or more elements selected from among the group consisting of La, K, Er, and Yb and Mdenotes an element selected from among the group consisting of Ni, Mn, and Sr. The ceramic material can be prepared by sintering at a temperature of 950° C. or less and has good piezoelectric characteristics, in particularly good longitudinal elongation (d) and a low dielectric loss factor (tan δ), even at a high Curie temperature (Tc), as well as a good electromechanical coupling factor (Kp).