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:
Oct. 01, 2002
Filed:
Nov. 27, 2001
Applicant:
Inventors:
Masamitsu Nishida, Osaka, JP;
Keiichi Takahashi, Hyogo, JP;
Kojiro Okuyama, Nara, JP;
Hiroshi Sogou, Hyogo, JP;
Junichi Kato, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 3/5495 ;
U.S. Cl.
CPC ...
C04B 3/5495 ;
Abstract
The present invention provides a piezoelectric ceramic composition that is free from lead and has a small grain size, a high coupling coefficient, a high mechanical Q, and a large frequency constant. This composition is characterized by being expressed by a formula of (Li Na K ) Ma Nb Mb O , wherein 0.03≦x≦0.2, 0≦y≦0.2, 0.98≦z≦1, 0<w≦0.05, Ma indicates at least one element selected from the alkaline-earth metals, and Mb denotes at least one element selected from Bi, Sb, and the rare earth elements.