Magneto-optical recording medium and method of making the same

Details Magneto-optical recording medium and method of making the same Magneto-optical recording medium and method of making the same

1987-09-30

1989-02-28

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

365122, 369 13, 369288, 427127, 427131, 427132, 428 66, 428694, 428900, G11B 724

Patent

active

048084565

ABSTRACT:
A magneto-optical recording medium comprises a substrate, a magneto-optical recording layer formed of a rare earth metal-transition metal alloy and a dielectric protective layer overlaid in this order on the substrate, and a rare earth metal layer overlaid on an edge face of the magneto-optical recording layer. The magneto-optical recording medium wherein the substrate is annular is made by forming the magneto-optical recording layer, covering the recording region on the magneto-optical recording layer with an annular mask having an outer diameter not larger than the outer diameter of the magneto-optical recording layer and/or an inner diameter not smaller than the inner diameter of the magneto-optical recording layer, overlaying the rare earth metal layer on an outer edge face and/or an inner edge face of the magneto-optical recording layer by dispersing rare earth metal particles toward the annular mask, removing the annular mask, and overlaying the dielectric protective layer on the magneto-optical recording layer.

REFERENCES:
patent: 4435801 (1984-03-01), Levin
patent: 4546464 (1985-10-01), Inoue et al.
patent: 4590493 (1986-05-01), Inoue et al.
patent: 4666789 (1987-05-01), Gueugnon et al.

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