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:
Oct. 06, 1987
Filed:
Jan. 17, 1986
Victor Company of Japan, Limited, Yokohama, JP;
Abstract
A magnetic disk or like magnetic recording medium having a magnetic layer provided on a non-magnetic substrate by dry-process or wet-process plating means and allowing a head to write and read data thereinto and thereoutof, and a method or producing such a recording medium. Scratch marks are formed on the surface of a non-magnetic thin layer, which is provided on the substrate, at a predetermined pitch and a predetermined depth in a particular direction which is substantially aligned with a direction in which the head writes data. A magnetic layer is deposited on the scratched surface of the non-magnetic layer. The pitch is less than about 50 microns, preferably about 0.1 to 10 microns, while the depth is about 0.002 to 0.1 microns in terms of center line mean roughness.