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. 26, 2006
Filed:
Mar. 22, 2004
Yuichi Watabe, Chuo-ku, JP;
Norikazu Ota, Chuo-ku, JP;
Yasuyuki Notsuke, Chuo-ku, JP;
Susumu Aoki, Chuo-ku, JP;
Tetsuya Roppongi, Chuo-ku, JP;
Naoto Matono, Saku, JP;
Yuichi Watabe, Chuo-ku, JP;
Norikazu Ota, Chuo-ku, JP;
Yasuyuki Notsuke, Chuo-ku, JP;
Susumu Aoki, Chuo-ku, JP;
Tetsuya Roppongi, Chuo-ku, JP;
Naoto Matono, Saku, JP;
TDK Corporation, Tokyo, JP;
SAE Magnetics (H.K) Ltd., Hong Kong, CN;
Abstract
Provided is a thin film magnetic head capable of securing recording characteristics even in the case where a return pole layer is disposed on a medium-outgoing side of the pole layer. The return yoke layer is disposed on a trailing side of the pole layer, and a neck height NH is within a range of NH≦W(a width of a front end portion in a main pole layer)+0.05 μm, and a height ratio (a ratio of the neck height NH to a throat height TH) NH/TH is within a range of 0.5<NH/TH<1.6. Thereby, the neck height NH and the height ratio NH/TH which have an influence on the recording characteristics can become appropriate, so even if the thickness of the gap layer is 0.2 μm or less to bring the return yoke layer closer to the pole layer, overwrite characteristics can be secured.