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:
Dec. 27, 1988
Filed:
Jul. 20, 1987
Susumu Funamoto, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The method of manufacturing a magnetic recording medium according to the present invention comprises a first step in which a ferromagnetic metal layer of a predetermined thickness is formed on a substrate, and a second step contiguous to said first step and in which another ferromagnetic metal layer is formed by applying a bias voltage to the substrate. Since the ferromagnetic metal layer formed at the second step is excellent in corrosion resistance, even if a protective layer such as a carbon layer incurs a pit defect when the medium is being produced or even when the protective layer is separated, the ferromagnetic metal layer in consideration will not be corroded, thus preventing any error from occurring in data recording or reproduction.