| 摘要 |
PURPOSE:To assure flatness uniform over a wide area by subjecting a magnetic recording medium disposed with thin films on both faces of a high-polymer film to a heat treatment after formation of the thin films thereon. CONSTITUTION:The magnetic recording medium disposed with the thin films on both faces of the high-polymer film 9 is subjected to the heat treatment after formation of the thin films 12 at the time of producing said recording medium. The long time on a low temp. side and the short time on a high temp. side are preferably combined for the heat treatment conditions. The internal strain possessed by the thin films 12 is thereby relieved and the strains remaining at the boundary faces between the high-polymer film 9 and the thin films 12 is also relieved at the time of forming the thin film. Since the flatness is determined by the constituting thickness of the thin films 12, the sufficient flatness is assured over a wide area by the present thickness control technique.
|
