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:
Oct. 30, 2007
Filed:
Aug. 01, 2005
Reiko Arai, Kanagawa, JP;
Takehiko Hamaguchi, Kanagawa, JP;
Atsushi Kikugawa, Tokyo, JP;
Hideaki Maeda, Kanagawa, JP;
Liping Shen, Kanagawa, JP;
Mikio Suzuki, Kanagawa, JP;
Reiko Arai, Kanagawa, JP;
Takehiko Hamaguchi, Kanagawa, JP;
Atsushi Kikugawa, Tokyo, JP;
Hideaki Maeda, Kanagawa, JP;
Liping Shen, Kanagawa, JP;
Mikio Suzuki, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the invention prevent demagnetization or degaussing of recorded magnetizations, even if a stray field is applied. In one embodiment, an output of a read head including a magneto-resistive effect element is inputted to a stray field detector through a DC amplifier and a DC filter. The stray field detector monitors dc components of the output from the read head, and escapes a head from above a magnetic recording medium.