Optically-readable data medium and reading device for such a medium
US5432773A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1992 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | May 6, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00745
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mobile optically-readable data medium, arranged in the form of a set of tracks having a sampled type format, each track having pre-engraved zones, known as pre-format zones, and zones reserved for user data, access to said tracks being obtained using pre-engraved marks, known as access marks, representing on each track at least one part of the address of the latter. This medium has no specific radial tracking marks. A reading device for information engraved on the surface of a medium such as that described above; this device performs the radial tracking using information read from the access marks. The invention applies to digital optical disks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.