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:
Aug. 27, 1996
Filed:
Aug. 31, 1994
Haruhiko Otsuka, Yokohama, JP;
Yuzo Murayama, Yokohama, JP;
Akihiko Tashiro, Yokohama, JP;
Kyoko Hyomi, Yokohama, JP;
Naohiko Ishimaru, Yokohama, JP;
AG Technology Co., Ltd., Yokohama, JP;
Abstract
A magnetic disc having one or multiple undercoat layers, a continuous thin film magnetic layer or continuous thin film multiple magnetic layers, a protective layer and a lubricant layer sequentially laminated on a non-magnetic disc substrate, which has surface roughness on the surface of the magnetic disc, said surface roughness being such that when the surface roughness is measured by an atomic force microscope or a scanning tunnel microscope, the maximum peak height is from 150 .ANG. to 800 .ANG. based on the height giving the highest frequency in the height distribution of the surface roughness, and the depth (D.sub.0.5) at a bearing ratio of 0.5% from the highest point is from 80 .ANG. to 450 .ANG..