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. 05, 2011
Filed:
Jan. 31, 2008
Yohji Maruyama, Saitama, JP;
Nelson Cheng, Fremont, CA (US);
Hideki Zaitsu, Kanagawa, JP;
Hisao Okamoto, Shizuoka, JP;
Yohji Maruyama, Saitama, JP;
Nelson Cheng, Fremont, CA (US);
Hideki Zaitsu, Kanagawa, JP;
Hisao Okamoto, Shizuoka, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the present invention achieve a high linear recording density and a high track recording density to thereby improve the areal recording density in a perpendicular magnetic recording apparatus having a magnetic head that includes a trailing shield and side shields around a main magnetic pole piece. According to one embodiment, in a magnetic recording apparatus, each of magnetic distances of various sorts is set so as to satisfy relationships of Lmag<T-Gap and HUS<S-Gap, where the magnetic shortest distance between the main magnetic pole piece and a trailing shield is defined as T-Gap; the magnetic shortest distance between the main magnetic pole piece and each of side shields disposed on both sides of the main magnetic pole piece is defined as S-Gap; a distance between a surface of the main magnetic pole piece and a lower surface of a magnetic recording layer constituting a recording medium is defined as Lmag; and a distance between the surface of the main magnetic pole piece and an upper surface of a soft magnetic underlayer of the recording medium is defined as HUS. Further, each of the magnetic distances of various sorts is set so as to satisfy a relationship of Lmag<T-Gap<HUS<S-Gap.