Optical recording disk, and recording/reading apparatus using sa

Details Optical recording disk, and recording/reading apparatus using sa Optical recording disk, and recording/reading apparatus using sa

1993-09-09

1995-06-06

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692754, G11B 7007

Patent

active

054228743

ABSTRACT:
The present invention relates to a magneto-optical recording medium, in which are provided at least a reading layer and a writing layer on a substrate. A track guide groove is formed in the medium so as to include in-groove portions and on-land portions. Pits are formed on a portion along the track longitudinally adjacent where an in-groove portion and where no guide groove exists. Pits are also formed in an on-land portion between the in-groove portions of the track guide groove. Only a portion where a temperature has been raised by optical beam irradiation is read, while a domain of a writing layer is copied on the writing layer, whereby a writing/reading operation can be effected with narrower track pitches.

REFERENCES:
patent: 4423502 (1983-12-01), Dil
patent: 4985881 (1991-01-01), Saito et al.
patent: 5132953 (1992-07-01), Matsubayashi
patent: 5191571 (1993-03-01), Fukumoto et al.
patent: 5214635 (1993-05-01), Satoh et al.

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