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:
Jan. 10, 2017
Filed:
Dec. 12, 2014
Sony Corporation, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
There is provided a magnetic recording medium including a surface having a longitudinal direction and a lateral direction. An arithmetic average roughness Ra, a ratio PSD/PSD, and a ratio PSD/PSDon the surface satisfy Ra≦3.0 nm, PSD/PSD≦0.65, and 1.3≦PSD/PSD≦2.3, in which PSDis an average value of PSD values in a range from 0.15 μm to 0.4 μm in the longitudinal direction of the surface, PSDis an average value of PSD values in a range from 0.15 μm to 0.4 μm in the lateral direction of the surface, PSDis an average value of PSD values in a range from 0.4 μm to 5.0 μm in the longitudinal direction of the surface, and PSDis an average value of PSD values in a range from 0.4 μm to 5.0 μm in the lateral direction of the surface.