Magneto-optical disk

Details Magneto-optical disk Magneto-optical disk

1993-10-04

1995-04-11

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369277, G11B 372

Patent

active

054065461

ABSTRACT:
In a magneto-optical disk comprising a disk-shaped substrate including a grooved region in its surface and a recording layer covering the grooved region, the groove is defined by a pair of opposed side walls and a bottom in a radial cross section of the substrate and has a depth from the substrate surface to the groove bottom. The angle .theta. included between tangents to the side walls is at least 120 degrees, and the groove has a half-value width of 0.90 to 1.15 .mu.m and a depth of 600 to 900 .ANG.. The disk produces satisfactory values of push-pull signal level, radial contrast, and C/N ratio.

REFERENCES:
patent: 4931336 (1989-01-01), Haneda
patent: 5075147 (1991-12-01), Usami et al.
patent: 5191565 (1993-03-01), Inoue et al.
patent: 5202881 (1983-04-01), Suzuki
patent: 5216665 (1993-01-01), Imataki
patent: 5279877 (1994-01-01), Uchiyama et al.

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