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. 09, 2012
Filed:
Dec. 24, 2008
Kazuyuki Kaigawa, Kitanagoya, JP;
Hirofumi Yamaguchi, Komaki, JP;
Kazuyuki Kaigawa, Kitanagoya, JP;
Hirofumi Yamaguchi, Komaki, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
A (Li, Na, K)(Nb, Ta, Sb)Obased piezoelectric material is a sintered body having a surface microstructure that comprises microscopic grains having a grain diameter of less than 5 μm, intermediate grains having a grain diameter of 5 μm or more and less than 15 μm, and coarse grains having a grain diameter of 15 μm or more and 50 μm or less. The amount of coarse grains is 3% or more in a share of grains in terms of area. The piezoelectric material can be manufactured by mixing metal-containing compounds so as to give the above-mentioned formulation, calcining the mixture and then crushing the resultant to obtain a calcined/crushed powder, then keeping temperature constantly at a temperature within a range from 800 to 950° C. for a predetermined period of time in a constant temperature keeping process, and raising temperature to firing temperature for sintering.