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. 06, 2011
Filed:
Oct. 15, 2009
Kei Hirata, Tokyo, JP;
Hideyuki Ukita, Tokyo, JP;
Shin Narushima, Tokyo, JP;
Isamu Toba, Tokyo, JP;
Hiromichi Umehara, Tokyo, JP;
Hisayoshi Watanabe, Tokyo, JP;
Hideyuki Yatsu, Tokyo, JP;
Kei Hirata, Tokyo, JP;
Hideyuki Ukita, Tokyo, JP;
Shin Narushima, Tokyo, JP;
Isamu Toba, Tokyo, JP;
Hiromichi Umehara, Tokyo, JP;
Hisayoshi Watanabe, Tokyo, JP;
Hideyuki Yatsu, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A main magnetic pole includes a first part extending from a medium facing surface to a point at a predetermined distance from the medium facing surface, and a second part other than the first part. An accommodation part for accommodating the main magnetic pole includes: a first layer having a groove; a second layer lying between the first layer and the main magnetic pole in the first layer's groove; and a third layer interposed in part between the second layer and the main magnetic pole in the first layer's groove. The second layer is formed of a metal material different from a material used to form the first layer. The third layer is formed of an inorganic insulating material. The second and third layers lie between the first layer and the first part. The second layer lies between the bottom of the first layer's groove and the second part, but the third layer does not. The distance between the bottom of the first layer's groove and the second part is smaller than that between the bottom and the first part.