Method for data reading/writing using an optical carrier with pattern information pits
US6507545B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2001 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Feb 12, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An EET (“eight-to-ten”) method has been proposed for two-dimensional spatial encoding of information stored in two- or three-dimensional, in particular fluorescent optical carriers. The method specifically ensures the same writing density as DVD carriers with EFM (“eight-fourteen modulation”) modulation code but for 0.8×0.4&mgr; information pit (fluorescent mark), i.e. as in CD data carriers. The larger—as compared to the DVD format—pit size enables a simpler technology for manufacturing fluorescent multilayer carriers, for instance of ROM type, and a stronger fluorescent signal in reading. The high writing density is ensured through virtually 100% filling of the information layer area with fluorescent marks in a gap-free manner. In addition, this allows application of the parallel data reading procedure and a ten-fold higher reading speed than in DVD systems. Increasing the size of the channel bit to 0.4 &mgr;m—which is 1.5 and 3 times higher than for CD and DVD formats, respectively—allows a significant reduction in the frequency band and hence in photoreceiver noises. For equal values of the reading radiation wavelength and n…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.