Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1997-02-19
1999-09-28
Dinh, Tan
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 94, G11B 724
Patent
active
059599618
ABSTRACT:
An optical recording medium is provided, this medium having a first substrate, onto the surface of which is formed a phase-change recording layer, and a second substrate, onto the surface of which is formed a magneto-optical recording layer, these layers being adhered to one another in a manner that causes their surface to be mutually opposing. By providing a means for selectively collecting laser light onto the phase-change recording layer and onto the magneto-optical recording layer, and selecting the output of either a differential amplifier or amplifier, to which are input the received-light outputs from light reflected from the optical recording medium, it is possible to perform access of both the phase-change recording layer and the magneto-optical recording layer, and to perform both recording and playbacking of information at high speed.
REFERENCES:
patent: 5446723 (1995-08-01), Best et al.
patent: 5499231 (1996-03-01), Fennema et al.
patent: 5606546 (1997-02-01), Best et al.
patent: 5615186 (1997-03-01), Rosen et al.
patent: 5764619 (1998-06-01), Nishiuchi et al.
Dinh Tan
NEC Corporation
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