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:
Feb. 04, 2003
Filed:
Nov. 13, 2001
Masamitsu Nishida, Osaka, JP;
Keiichi Takahashi, Nishinomiya, JP;
Kojiro Okuyama, Ikoma, JP;
Junichi Kato, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a piezoelectric ceramic composition that can be manufactured easily by an ordinary sintering method, is free from lead, and has a large frequency constant, a small grain size, and a high mechanical Q. This composition is expressed by a formula of (1-v-w)[(Li Na K ) RO ].vLMnO .wBi Na TiO . The present invention also provides a piezoelectric ceramic composition, including at least one selected from Mn, Cr, and Co that is added to a composition expressed by a formula of (Li Na K ) RO so as to have a ratio thereof to the whole of 0.01 to 1 wt % in terms of MnO , Cr O , and CoO, respectively. In the above-mentioned formulae, 0≦v≦0.05, 0≦0.2, v+w>0, 0.2≦x≦0.97, 0≦y≦0.8, x+y≧0.8, 0.98≦z≦1, L indicates at least one element selected from the rare earth elements, and R denotes at least one element selected from Nb, Ta, and Sb.