Magnetooptical disk having a thermal diffusion layer to suppress

Details Magnetooptical disk having a thermal diffusion layer to suppress Magnetooptical disk having a thermal diffusion layer to suppress

1998-04-06

1999-12-07

Cabeca, John W.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 13, 3692752, 369288, 428 644, 428694EC, 428694ML, G11B 1110

Patent

active

059995122

ABSTRACT:
A magnetooptical disk includes a thermal diffusion layer to suppress thermal transmission between adjacent information tracks. The information tracks are formed within the magnetooptical disk along respective land portions or groove portions having a difference in grade. During recording and erasing of the magnetooptical disk, the land portions and groove portions may be changed with identical power levels. The thermal diffusion layer diffuses heat generated by irradiation of a laser beam. A protective layer is formed over the thermal diffusion layer and a recording layer which records various bits of information is formed over the protective layer.

REFERENCES:
patent: 5118541 (1992-06-01), Yamamoto et al.
patent: 5309427 (1994-05-01), Matsumoto
patent: 5635267 (1997-06-01), Yamada et al.
patent: 5654058 (1997-08-01), Kirino et al.
patent: 5821004 (1998-10-01), Hino et al.

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