Apparatus for recording and reproducing data on a disk
US5490126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1994 |
| Grant date | Feb 6, 1996 |
| Priority date | — |
| Expiry date | Apr 4, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10194
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an apparatus for recording data on a rewritable optical disk with a mark edge recording the occurrence of edge shift is compensated for. As a first power of a laser beam is greater than a second power, start and termination ends of each mark are produced by irradiation of the first power and a remaining intermediate portion of the mark is produced by irradiating the first and second powers alternately at equal intervals of a predetermined duration which is shorter than a period of a clock pulse. Also, the start and termination ends of the mark are specifically dislocated corresponding to a length of the mark and lengths of two neighbor spaces before and after the mark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.