Magneto-optical recording disc and method of producing it

Details Magneto-optical recording disc and method of producing it Magneto-optical recording disc and method of producing it

1991-04-25

1993-08-03

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

20419215, 20419216, 20419220, 20419226, 360131, 360135, 369 13, 428698, 428702, 428704, 428900, 430945, G11B 566, C23C 1400

Patent

active

052327906

ABSTRACT:
The refractive index of a dielectric layer between a transparent substrate and a magneto-optical recording layer is varied across the thickness, with a portion of the layer on the substrate side having a lower refractive index and the other portion on the magneto-optical recording layer side having a higher refractive index, to prevent the disc from warping. To increase the refractive index within the the dielectric layer, the argon pressure is lowered in the course of the sputtering. Alternatively, an interruption of the sputtering can reduce warpage.

REFERENCES:
patent: 3463574 (1969-08-01), Bastien
patent: 4639816 (1987-01-01), Tomita
patent: 4649451 (1987-03-01), Tomita
patent: 4664977 (1987-05-01), Osato et al.
patent: 4680742 (1987-07-01), Yamada et al.

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