Optical disc having plural zones of recording tracks
US5796711A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1994 |
| Grant date | Aug 18, 1998 |
| Priority date | — |
| Expiry date | Aug 24, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0901
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc of a sampled servo tracking method excludes unnecessary interference to wobbled pits of the servo area, whereby a tracking servo can be stably performed, a high density maintained, and a large recording capacity obtained. An optical disc in which a circular recording area comprising a plurality of concentric tracks or a spiral recording track which hold information signals including sync signals is divided into a plurality of zones bounded by circular boundary areas. The recording track is constituted by a plurality of sectors each comprising servo areas and data areas, the servo areas being located along straight lines in radial directions within the zone. The track pitch of the boundary area is made larger than the track pitch within the zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.