Optical information recording medium, and substrate and manufacturing method for the optical information recording medium
US8139470B2 · kind B2 · utility
2Cited by
9References
2Claims
0Family size
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Key dates
| Filing date | Feb 17, 2011 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Feb 17, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24038
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical disk including at least a rewritable phase change material and comprising a recording layer having a reflectivity of more than 15%, an address output value as an address pit signal component occupying in a reproduced signal in a non recording state is prescribed to be 0.18 though 0.27 or a numerical aperture of an address pit signal occupying in a reproduced signal in a non recording state is prescribed to be more than 0.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.