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:
Jan. 08, 2013
Filed:
Jun. 07, 2011
Naoaki Abe, Nagaokakyo, JP;
Hayato Katsu, Nagaokakyo, JP;
Masato Goto, Nagaokakyo, JP;
Atsushi Kishimoto, Nagaokakyo, JP;
Akinori Nakayama, Nagaokakyo, JP;
Naoaki Abe, Nagaokakyo, JP;
Hayato Katsu, Nagaokakyo, JP;
Masato Goto, Nagaokakyo, JP;
Atsushi Kishimoto, Nagaokakyo, JP;
Akinori Nakayama, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Nagaokakyo-Shi, Kyoto-fu, JP;
Abstract
A semiconductor ceramic includes a BaTiO-based composition, as a main component, having a perovskite structure represented by general formula ABO, wherein part of Ba constituting the A site is replaced with Na, Bi, Ca, and a rare-earth element having an ionic radius smaller than that of the Na; the content of the rare-earth element when the total number of moles of the elements constituting the A site is 1 mole is 0.0005 to 0.015 on a molar basis; and the content of the Ca when the total number of moles of the elements constituting the A site is 1 mole is 0.05 to 0.20 (preferably 0.125 or more and 0.175 or less) on a molar basis. A PTC thermistor includes a component bodyformed of the semiconductor ceramic. Accordingly, high reliability is achieved even if an alkali metal element is present.