Process for producing magnetic recording medium

Details Process for producing magnetic recording medium Process for producing magnetic recording medium

1986-11-10

1989-04-25

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

427 48, 427130, 428694, 428900, G11B 570

Patent

active

048247081

ABSTRACT:
A disk-form magnetic recording medium having a minimized change in output on an output envelope is produced by a process which comprises coating a nonmagnetic substrate with a magnetic paint and applying a magnetic field for orientation to the magnetic paint in a yet unsolidified state on the substrate moved in a direction. The magnetic field for orientation is made stronger in a direction perpendicular to the moving direction of the coated substrate than in the moving direction. The directional change in magnetic field for orientation is provided, e.g., by a plurality of magnetic poles having different magnetic powers or disposed with increasing angular spacing in a direction leaving the moving direction of the substrate, or by an electromagnet supplied with a positionally varying current.

REFERENCES:
patent: 4189508 (1980-02-01), Chiba et al.
patent: 4578280 (1986-03-01), Grainer et al.
patent: 4678682 (1987-07-01), Asai et al.
IEEE Standard Dictionary of Electrical and Electronics Terms, Copyright 1984, p. 318.
Specification of Still Video Floppy Disc Systems, Published by Engineering Department Electronic Industries Association of Japan, Sep. 1987, p. 14.

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