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. 10, 2012
Filed:
Aug. 25, 2006
Daisuke Fukuda, Kirishima, JP;
Daisuke Fukuda, Kirishima, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
A dielectric ceramic includes primary crystal grains. The primary crystal grains include a composite oxide of Ti and at least one kind of alkaline earth metal element selected from Ca, Sr and Ba. The primary crystal grains contain metal compositions of Mg, Mn and a rare earth element. At least one of the metal composition of the Mg, the Mn and the rare earth element is present at a higher concentration on the surface side of the primary crystal grains than the inside thereof. A 0.04 to 0.2 parts by mass of Zr in terms of oxide to 100 parts by mass of the composite oxide is present. As a result, a high dielectric constant can be imparted even to finely granulated barium titanate based crystal grains.