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. 01, 2014
Filed:
Apr. 06, 2011
Takesha Shimada, Osaka, JP;
Kentaro Ino, Osaka, JP;
Toshiki Kida, Tottori, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
An object is to provide a PTC element that can be made thinner, using a Pb-free semiconductor ceramic composition. The object is achieved with a PTC element including at least two metal electrodes and a BaTiOsystem semiconductor ceramic composition arranged between the electrodes, in which, in the semiconductor ceramic composition, a portion of Ba in the BaTiOsystem is substituted by Bi—Na and a semiconductorizing element, vacancies are formed on Bi sites by depleting at least a portion of Bi, and oxygen defects are formed on a crystal thereof. Since the PTCR characteristic at the inside of the semiconductor ceramic composition is negligibly weak in comparison with the PTCR characteristic at the interface between the semiconductor ceramic composition and the electrodes, the PTC element can be made thinner.