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. 23, 2008
Filed:
Jan. 22, 2007
Toshikazu Takeda, Omihachiman, JP;
Toshikazu Takeda, Omihachiman, JP;
Murata Manufacturing Co., Ltd., Nagaokakyo-Shi, JP;
Abstract
The piezoelectric ceramic composition of the present invention contains a main component represented by general formula {(1-n)(AgLi)(NbTa)O-n(M1,M2)M3M3O} or {(1-n)(AgLi)(NbTa)O-nM4M5O} and x, y, m, and n are defined to be 0.075≦x<0.40, 0≦y<0.2, 0.98≦m≦1.0, and 0.01≦n≦0.1. M1 is a trivalent metal element such as Bi; M2 is a monovalent metal element such as K, Na, Li or Ag; M3 and M5 each are a tetravalent metal element such as Ti, Zr, Sn or Hf; and M4 is a divalent metal element such as Ba, Sr, Ca, or Mg. With this composition, an highly reliable lead-free piezoelectric ceramic composition having a high relative dielectric constant and good piezoelectric properties such as electromechanical coupling factor kand piezoelectric constant dcan be provided, and a highly reliable lead-free piezoelectric element can be fabricated using the piezoelectric ceramic composition.