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:
Feb. 03, 2009
Filed:
Oct. 28, 2005
Takehiko Hamaguchi, Kanagawa, JP;
Yoshihisa Kamo, Tokyo, JP;
Hideaki Maeda, Kanagawa, JP;
Yukiya Shimizu, Kanagawa, JP;
Ikuya Tagawa, Kanagawa, JP;
Tetsuo Yuki, Kanagawa, JP;
Takehiko Hamaguchi, Kanagawa, JP;
Yoshihisa Kamo, Tokyo, JP;
Hideaki Maeda, Kanagawa, JP;
Yukiya Shimizu, Kanagawa, JP;
Ikuya Tagawa, Kanagawa, JP;
Tetsuo Yuki, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., AZ Amsterdam, NL;
Abstract
Embodiments of the invention prevent a decrease in magnetization or demagnetization from occurring to recording magnetization regardless of a direction in which a stray field is applied. In one embodiment, an apparatus for data storage system comprises a head having a magnetic field shield in the vicinity of a main pole, and a cover of the device, using a constituent material with a magnetic field shielding effect, across the cover, or at part thereof. When a stray field in a direction perpendicular to a recording medium is applied, the effect of the magnetic field is alleviated by the magnetic field shield installed in the vicinity of the main pole. In such a case, it need only be sufficient to form the magnetic field shield in a shape optimum for removing the stray field in the perpendicular direction only. When a stray field in a direction horizontal in relation to the recording medium is applied, the magnetic field acting on the recording medium is removed by the cover of the device comprising a magnetic component.