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:
May. 04, 2010
Filed:
Jan. 05, 2007
Hisashi Kimura, Kanagawa, JP;
Atsushi Kato, Kangawa, JP;
Norihiro Ookawa, Kangawa, JP;
Kikuo Kusukawa, Saitama, JP;
Hisashi Kimura, Kanagawa, JP;
Atsushi Kato, Kangawa, JP;
Norihiro Ookawa, Kangawa, JP;
Kikuo Kusukawa, Saitama, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
If the length of a track-defining section from an air bearing surface varies due to tolerance during a head manufacturing process, the recording magnetic field changes, which involves the variation of the track width to be recorded on the medium. In accordance with an embodiment of the present invention, the main magnetic pole of a magnetic head includes a track-defining section shaped in trapezoid and a magnetic flux guiding section formed in trapezoid, as viewed from above. The track-defining section is formed such that its width parallel to the air bearing surface (ABS) increases at the rate of 10 to 20% with respect to its height-direction length. The rate of 10 to 20% is a range in which the shape is properly controllable taking into account the variations resulting from the tolerance of the head manufacturing process.