Optical disk and optical disk apparatus having a predetermined pattern of marks on tracks such that a reproduced signal is caused to jitter
US5898654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1997 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Sep 17, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk and optical disk apparatus used for accurately reproducing and recording information regardless of the physical distortions of disks and the electrical distortions of a tracking system. This is achieved in the present invention by providing an optical disk apparatus which takes into account the physical fluctuations, such as radial tilt and tangential tilt, and the electrical fluctuations, such as focus errors and tracking errors, and makes appropriate adjustments in the optical disk apparatus accordingly. These adjustments are made based upon relationships existing between a jittering amount of the reproduced signals and the above-mentioned fluctuations. Specifically, the present invention generates a predetermined pattern of marks which, when recorded, are arranged such that a signal reproduced from the predetermined pattern of marks is caused to jitter. Depending on the specific pattern of marks generated, the reproduced signal experiences an amount of jittering that is optimal so as to allow the present invention to make appropriate adjustments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.