METALLIC THIN FILM TYPE MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURE

摘要

PURPOSE:To manufacture a metallic thin film type magnetic recording medium having high traveling performance and a high C/N ratio in a well-balanced state with high reproducibility by forming a ferromagnetic metallic thin film on one side of a substrate and a back layer contg. carbon powder dispersed in a binder and having specified average surface roughness on the other side of the substrate. CONSTITUTION:A layer contg. carbon powder dispersed in a binder is formed on one side of a substrate by coating, and it is dried and calendered by press bonding with a roll. A ferromagnetic metallic thin film is then formed on the other side of the substrate by vapor deposition. The substrate is made of a polymer such as polyethylene terephthalate or polyamide, and both sides of the substrate may be coated beforehand. The thickness is 4-20mum. The surface roughness of one side on which the magnetic film is formed is 20-300Angstrom , and that of the rear side is 100-1,000Angstrom .