Magneto-optical disc

Details Magneto-optical disc Magneto-optical disc

1995-07-17

1996-10-22

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 369 13, 428 643, 428 646, G11B 1100, G11B 370

Patent

active

055684661

ABSTRACT:
A magneto-optical disc includes a recording layer (4) and a protective film (7) of radiation-cured resin on a substrate (2). Information is written in the recording layer with the aid of a magnetic head in sliding contact with the disc. In a first form, when the protective film is subject to a micro-vibration scratch test by setting the disc in a thin film scratch tester equipped with a diamond indentor having a radius of curvature R of up to 50 .mu.m, the relationship: 0.8.ltoreq.L/R.sup.2 .ltoreq.2.7 is met wherein L is the critical load (N.m) under which the thin film is scratched. In a second form, the protective film has a dynamic modulus of 5.0.times.10.sup.9 to 4.0.times.10.sup.10 dyn/cm.sup.2 at 100.degree. C. The disc is highly durable.

REFERENCES:
patent: 4694358 (1987-09-01), Muchnik et al.
patent: 5020048 (1991-05-01), Arai et al.
patent: 5202220 (1993-04-01), Park et al.
patent: 5237548 (1993-08-01), Muchnik
patent: 5266409 (1993-11-01), Schmidt et al.
patent: 5342669 (1994-08-01), Yoshikawa et al.
patent: 5353278 (1994-10-01), Murakami
patent: 5416754 (1995-05-01), Washo
patent: 5492773 (1996-02-01), Sekiya et al.

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