Information recording media and playback power determining method for signal playback
US7706244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2008 |
| Grant date | Apr 27, 2010 |
| Priority date | — |
| Expiry date | Oct 11, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A super resolution optical disk medium having an array of pits less than or equal in size to optical resolution is disclosed, wherein the pits are read by using heat generated within the medium upon irradiation of a read laser beam. A playback power determination method for use with the disk is also disclosed. A playback power level at which super resolution occurs is determined based on a bit error rate (bER) of the optical disk and the amplitude of a playback signal having a predefined signal pattern. In the optical disk, NR/SR is set to one (1) or less, where SR is the signal obtained from a high-temperature region in case the playback is performed in the state that the super resolution occurs, and NR is the amplitude of a signal which is read in the absence of such super resolution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.