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. 18, 2007
Filed:
Jun. 14, 2002
Masaru Nanao, Tokyo, JP;
Yasuharu Miyauchi, Tokyo, JP;
Tamotsu Ishiyama, Tokyo, JP;
Masahito Furukawa, Tokyo, JP;
Shogo Murosawa, Tokyo, JP;
Yoshiko Gokita, Tokyo, JP;
Masaru Nanao, Tokyo, JP;
Yasuharu Miyauchi, Tokyo, JP;
Tamotsu Ishiyama, Tokyo, JP;
Masahito Furukawa, Tokyo, JP;
Shogo Murosawa, Tokyo, JP;
Yoshiko Gokita, Tokyo, JP;
TDK Corporation, Nihonbashi, JP;
Abstract
Provided is a piezoelectric ceramic with a wider operating temperature range capable of obtaining a larger amount of displacement and being easily sintered, as well as being superior in terms of ultra-low emission, environmental friendliness and ecology. A piezoelectric substratecomprises a composition including a perovskite-type oxide (NaKLiAg)(NbTa)Oand a tungsten bronze-type oxide M(NbTa)O(M is an element of Group 2 in the long form of the periodic table of the elements). The values of x, y and z are preferably within a range of 0.1≦x≦0.9, 0≦y≦0.2, and 0≦z≦0.05, respectively. The content of the tungsten bronze-type oxide is preferably 5.3 mol % or less. Thereby, a higher Curie temperature and a larger amount of displacement can be obtained, and sintering can be more easily carried out.