Manufacture of magnetic discs

Details Manufacture of magnetic discs Manufacture of magnetic discs

1975-12-16

1979-01-09

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427128, H01F 1002

Patent

active

041339118

ABSTRACT:
The invention relates to an improved process for the manufacture of magnetic discs carrying very thin magnetic layers, by applying a fluid dispersion of magnetic materials in a binder mixture to rigid base discs by the spin-coating process. Above the side of the base disc which is to be provided with the magnetic layer, there are arranged means which produce an aerodynamic boundary layer above the discs during rotation of the latter. This avoids the formation of surface irregularities and of coating streaks during production of the layer by spin-coating.

REFERENCES:
patent: 2744034 (1956-05-01), Dalton et al.
patent: 3198657 (1965-08-01), Kimball et al.
patent: 3705048 (1972-12-01), Staunton
patent: 3730760 (1973-05-01), Machmiller
"Advances in Applied Mechanics" vol. 4 (IV), Academic Press, 1956, p. 159 et seq.

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