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. 16, 2012
Filed:
May. 19, 2011
Atsushi Kishimoto, Nagaokakyo, JP;
Hayato Katsu, Nagaokakyo, JP;
Masato Goto, Nagaokakyo, JP;
Naoaki Abe, Nagaokakyo, JP;
Akinori Nakayama, Nagaokakyo, JP;
Atsushi Kishimoto, Nagaokakyo, JP;
Hayato Katsu, Nagaokakyo, JP;
Masato Goto, Nagaokakyo, JP;
Naoaki Abe, 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. The molar ratio m between the A site and the B site satisfies 1.001≦m≦1.01. Part of Ba constituting the A site is replaced with Bi, Ca, a rare-earth element, and Na. The molar 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 to 0.175). A PTC thermistor includes a component body formed of the semiconductor ceramic. Accordingly, there is provided a lead-free semiconductor ceramic that substantially does not contain lead and that has desired PTC characteristics and high reliability.