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. 24, 2007
Filed:
May. 06, 2005
Takashi Morikawa, Tokyo, JP;
Teiichiro Umezawa, Tokyo, JP;
Hiroshi Tomiyasu, Tokyo, JP;
Masafumi Ishiyama, Singapore, SG;
Takashi Morikawa, Tokyo, JP;
Teiichiro Umezawa, Tokyo, JP;
Hiroshi Tomiyasu, Tokyo, JP;
Masafumi Ishiyama, Singapore, SG;
Hoya Corporation, Tokyo, JP;
Hoya Magnetics Singapore Pte. Ltd., Singapore, SG;
Abstract
In a magnetic recording medium which comprises a substrate (), a magnetic layer () formed on the substrate, a carbon-based protection layer () comprising carbon and formed on the magnetic layer, and a lubrication layer () formed on the carbon-based protection layer, the carbon-based protection layer comprises a hydrogenated carbon protection layer () facing the magnetic layer and a nitrogenated carbon protection layer () facing the lubrication layer. The hydrogenated carbon protection layer () comprises carbon and hydrogen. The nitrogenated carbon protection layer () includes no hydrogen but comprises carbon and nitrogen.