Optical recording system with optical recording medium having multilevel recording surface for tracking
US4879691A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1989 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Jan 19, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00718
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium which has data tracks and tracking lines juxtaposed with each other in a data recording region so as to write/read data into/from the data tracks, using the tracking lines as a reference. The data recording region is so configured as to have recessed portions and raised portions arranged alternatingly and extending along each other in a direction of data reading/writing. The so formed recessed portions and raised portions provide data tracks. With this configuration, the boundary edges between the respective recessed portions and the respective raised portions are used as tracking lines, so that data can be written in the recessed or raised portions, referring to the boundary edges as tracking lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.