Optical disk, method of playing optical disk, and optical disk drive
US7236447B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2004 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Jun 15, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk includes a recording region formed on a substrate for recording user data, and a management region formed on the substrate which includes an identification information region for recording disk-specific identification information such as address information (ID), a SYNC code, or an error detection code (EDC). The identification information region in this optical disk has a flat portion (a mirror region) formed by means of sectioning part of a groove or a land in a given step. The disk-specific identification information is recorded on the identification information region inclusive of this mirror region as irreversible record marks. Moreover, a signal of the disk-specific identification information is detected by a laser beam which is servoed on the recording track of this optical disk. Then, a change in the detected signal level of the disk-specific identification information is detected based on a predetermined threshold level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.