System for creating, reading and writing on rotatable storage media, an apparatus for determining laser aging characteristics
US6046970A · kind A · utility
13Cited by
49References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Feb 13, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for reading from and writing on rotatable information media includes embedded reference tracks whose edges are used for precise information track positioning and also for precise laser source positioning. The nature of the returned signal is such that it can be used for monitoring the aging characteristics of the laser light source. Maximum and minimum values are gathered over time and stored in any convenient non-volatile storage device, even the disk itself.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.