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:
Apr. 26, 2005
Filed:
Sep. 23, 2003
Fuyutoshi Sato, Nagoya, JP;
Shin-ichi Hirano, Chita-gun, JP;
Masato Matsubara, Nagoya, JP;
Wataru Sakamoto, Nagoya, JP;
Toshinobu Yogo, Nagoya, JP;
Koichi Kikuta, Toyoake, JP;
Fuyutoshi Sato, Nagoya, JP;
Shin-ichi Hirano, Chita-gun, JP;
Masato Matsubara, Nagoya, JP;
Wataru Sakamoto, Nagoya, JP;
Toshinobu Yogo, Nagoya, JP;
Koichi Kikuta, Toyoake, JP;
Noritake Co., Limited, Nagoya, JP;
Nagoya Industrial Science Research Institute, Nagoya, JP;
Abstract
A lead-free piezoelectric ceramic composition wherein a suitable amount of Cu is contained in a perovskite compound of a non-stoichiometric composition represented by a formula (KA)(NbB)O, wherein 'A' represents at least one of Na and Bi, while 'B' represents at least one of Ta and Ti, and wherein 0<x≦1, 0<y<1, and 0≦z≦1, so that by-products such as KCuNbOand KCuTaOare produced as a result of reaction of (NbB) with Cu in the process of calcination of a starting material, and the by-products restrict melting and abnormal grain growth of (KNa)(NbTa) Oduring firing of a calcined body, thereby improving sinterability of the fired body, while restricting volatilization of alkali components and melting of KNbO, thereby increasing the density and improving the piezoelectric properties of the fired body. The ceramic composition is prepared by firing a starting composition including the perovskite composition as a primary component, and a secondary component in the form of at least one of compounds KCuNbO, KCuTaOand KCuTiO.