Optical disk and optical disk apparatus
US7283459B2 · kind B2 · utility
2Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 7, 2003 |
| Grant date | Oct 16, 2007 |
| Priority date | — |
| Expiry date | Nov 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/261
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is provided an optical disk which adopts a PRML (Partial Response and Maximum Likelihood) method for reproduction of recorded information and whose shortest pit has a conical shape without a bottom surface. If the PRML method is adopted, since it is not necessary to assure a large amplitude of a reproduction waveform of the shortest pit, the pit may have a conical shape. The conical pit enables recording with the dense shortest pit even in a conventional original disk recorder and original disk exposure process, thereby increasing a recording density in a dividing direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.