Optical recording medium
US6477136B2 · kind B2 · utility
5Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 24, 2001 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | May 24, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium which can precisely reproduce recording pits formed in pregrooves having width narrower than the diameter of a reproducing beam spot, and which can reduce the jitter and the block error rate, wherein the following unequal equation is satisfied:0<b≦a<Dp≦Dg  (1)where Dg is a maximum depth of the pregrooves, Dp is a maximum depth of the prepits, a is a depth of edge parts between the pregrooves and the prepits on the inner peripheral side of the prepits, and b is a depth of the edge parts on the outer peripheral side of the prepits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.