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:
Jul. 03, 2007
Filed:
Aug. 26, 2004
Koji Sonoda, Ome, JP;
Junya Kato, Ichihara, JP;
Masato Fukushima, Ichihara, JP;
Yukihisa Matsumura, Ichihara, JP;
Koji Sonoda, Ome, JP;
Junya Kato, Ichihara, JP;
Masato Fukushima, Ichihara, JP;
Yukihisa Matsumura, Ichihara, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
A texture processing for imparting a magnetic orientation in the circumferential direction is applied to a substrate so as to impart a magnetic anisotropy to the magnetic disk in the circumferential direction. An underlying film, a magnetic recording film, a protective film, and a lubricating film are laminated one upon the other on the surface of the substrate. The surface of the magnetic disk has a value of the contact ratio [BH 1.0 nm] falling within a range of 7% to 15% in a region having a height not smaller than 1.0 nm, based on the height at which the contact ratio in the bearing curve of a surface roughness is 50%.