Optical information recording medium, original disc for optical information recording medium, and method of manufacturing the same
US7294281B2 · kind B2 · utility
0Cited by
8References
3Claims
0Family size
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Key dates
| Filing date | Aug 30, 2004 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Aug 30, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10586
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording medium, which includes both of a land surface and a groove surface as a recording track and presents high signal quality. The optical information recording medium includes both a land and a groove as the recording track on a substrate, in which a laser light is irradiated from a reverse side of the substrate to thereby carry out a recording and a reproduction, and an inclination angle of a groove side is 25° or more and 40° or less, and both of arithmetic average roughness (Ra) on the land surface and the groove surface are assumed to be 0.2 to 0.7 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.