Magneto-optical disk having lands and grooves for recording info

Details Magneto-optical disk having lands and grooves for recording info Magneto-optical disk having lands and grooves for recording info

1994-04-12

1995-07-04

Popek, Joseph A.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369277, 3692754, G11B 724

Patent

active

054307066

ABSTRACT:
A magneto-optical disk is made up of a disk form of substrate including on its surface a recessed area having at least one of a groove and pits, and a recording layer provided such that it covers the recessed area. The geometry of at least one of the groove and pits is designed to conform to .theta..sub.10 .gtoreq..theta..sub.50 and .theta..sub.50 >.theta..sub.90 where .theta..sub.10, .theta..sub.50 and .theta..sub.90 are respectively the angles that tangential lines make with horizontal lines at 10%, 50% and 90% depth positions of a side wall of the recess in the diametrical direction of the substrate. This magneto-optical disk is improved in terms of the push-pull signal level, radial contrast, skew margin and C/N.

REFERENCES:
patent: 4931336 (1990-06-01), Hameda
patent: 5144552 (1992-09-01), Abe
patent: 5187703 (1993-02-01), Katayama et al.
patent: 5274623 (1993-12-01), Usami et al.
patent: 5325353 (1994-06-01), Sasaki et al.

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