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. 28, 1998
Filed:
Sep. 16, 1992
Noriyoshi Goda, Odawara, JP;
Shinya Matsuoka, Odawara, JP;
Tatsuo Kawaide, Odawara, JP;
Takaaki Shirakura, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention relates to a high-density magnetic recording medium (or 'media' as it is sometimes called) for a recording/reproduction system (such as thosed used in computer disk drives) and, more particularly, to a magnetic recording medium having a plurality of magnetic recording layers such that the uppermost layer is comparatively thinner and more densely structured than the lower magnetic recording layers. The present magnetic recording medium comprises a non-magnetic plated substrate, a non-magnetic underlying layer laminated on the plated substrate, a plurality of magnetic alloy layers including the uppermost layer laminated onto the underlying layer, a non-magnetic covering layer laminated onto the uppermost layer, and a lubricating layer formed onto the non-magnetic covering layer. The present invention improves the corrosion resistance of an alloy-type magnetic recording medium while maintaining or exceeding the recording/reproducing characteristics of such media, all at a desirable cost of production.