US Patent 7484278 Method of manufacturing a multi-layered piezoelectric

Patent 7484278 was granted and assigned to NGK Insulators on February, 2009 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

NGK Insulators

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7484278

Date of Patent

February 3, 2009

Patent Application Number

11033785

Date Filed

January 12, 2005

Patent Primary Examiner

‌

Peter Dungba Vo

Patent abstract

A multi-layered piezoelectric device includes a plurality of piezoelectric portions and a plurality of electrodes electrically connected to the piezoelectric portions that are formed in layers on a ceramic substrate. A first piezoelectric portion is made of a piezoelectric ceramic composition containing Ni in an amount of 0.08 to 0.31% by mass (in terms of NiO), and second and upper piezoelectric portions are made of a piezoelectric ceramic composition of higher Ni content than in the first piezoelectric portion. An electrode is provided at least between the first piezoelectric portion and the second piezoelectric portion.