Optical recording medium having multiple recording layers and method for recording and reproducing thereof
US5959961A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1997 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.