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AssigneeHitachi, Ltd.
InventorsKatsuyoshi Chiba, Masayuki Katsumoto, Yasutaro Uesaka, Hajime Fukke, Heigo Ishihara, Iwao Matsuyama, Naoki Kodama, Hitoshi Inoue, Yoshiharu Terada
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A coating type, magnetic disk is produced by applying a magnetic paint containing magnetic powders in a dispersed state to a non-magnetic substrate, thereby forming a magnetic recording film thereon, and applying surface waves to the magnetic recording film in an undried state. By applying the surface waves to the magnetic recording film, dispersibility and orientation of the magnetic powders are improved and a longitudinally oriented, coating type magnetic disk with distinguished electromagnetic properties, such as a high S/N ratio, etc. can be obtained.
A process for producing a rigid magnetic disk, which comprises applying a magnetic paint containing at least magnetic powders in a dispersion state in a macromolecular binder to a non-magnetic disk substrate and then longitudinally orienting the magnetic powders by generating standing waves or interference waves in the applied magnetic paint while keeping the applied magnetic paint in an undried state, thereby forming a magnetic recording film on the non-magnetic substrate.
A process for producing a rigid magnetic disk, which comprises applying a magnetic paint containing at least magnetic powders in a dispersion state in a macromolecular binder to a non-magnetic disk substrate and then longitudinally orienting the magnetic powders by generating standing waves or interference waves in the applied magnetic paint by contacting a surface wave vibrator with the non-magnetic substrate while keeping the applied magnetic paint in an undried state, thereby forming a magnetic recording film on the non-magnetic substrate.
Dependencies are inferred from the claim text.