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:
Feb. 24, 2004
Filed:
Sep. 10, 2001
Seiichi Onodera, Miyagi, JP;
Shinya Yoshida, Miyagi, JP;
Kazunari Motohashi, Miyagi, JP;
Takashi Kanou, Miyagi, JP;
Tomoe Iwano, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
In the metallic thin film magnetic recording medium having the magnetic layer formed on a main face of a nonmagnetic supporting body according to vacuum thin film formation technology, the thickness of the nonmagnetic supporting body is 5 &mgr;m or less, the thickness of the magnetic layer is 20 nm-100 nm and a lining layer 20 nm-200 am in thickness is formed of metal, non-metal or alloy of these materials or oxide compound thereof according to vacuum thin film formation technology. Light transmittance is 5% or less and permeating water vapor amount is 5 g/m ·day or less. The lining layer and the back layer are formed successively on a main face opposite to the magnetic layer formation face. The relative roughness factor (Ra) of the topmost surface of the lining layer formation face is 2-15 nm.