Optical disc, device for checking optical disc, and device for recording information on optical disc
US5572507A · kind A · utility
83Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1995 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Sep 11, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00601
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc has a sequence of pits which extends along a track. The pit sequence represents a recorded signal divided into data blocks. The pit sequence includes a normal pit train and an unusual pit train. The normal pit train is symmetrical with respect to a center of the track. The unusual pit train is different from the normal pit train in at least one of shape and pit arrangement. The unusual pit train is at a position having a predetermined relation with the data blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.