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:
Mar. 17, 2015
Filed:
Feb. 23, 2011
Naruhisa Nagata, Kedah Darul Aman, MY;
Ryoji Kobayashi, Matsumoto, JP;
Yoshihisa Suzuki, Matsumoto, JP;
Naruhisa Nagata, Kedah Darul Aman, MY;
Ryoji Kobayashi, Matsumoto, JP;
Yoshihisa Suzuki, Matsumoto, JP;
Fuji Electric Co., Ltd., Kawasaki-Shi, JP;
Abstract
A magnetic recording medium includes a substrate; a metal film layer disposed on the substrate; a protective film disposed on the metal film layer; and a lubricant film disposed on a surface of the protective film. The protective film is composed of amorphous carbon containing fluorine and nitrogen in a surface region, and a region deeper than 0.5 nm deep from the surface of the protective film is substantially free from the fluorine and nitrogen. The fluorine and nitrogen may be each added in an amount of 5 to 20 at. %. The present invention simultaneously accomplishes a reduction in film thickness, an improvement in durability and corrosion resistance, and an improvement of the bonding strength of the surface of the protective film to the lubricating film.