Method for automatically compensating for the eccentricity in an optical head positioning servo-mechanism
US5121374A · kind A · utility
21Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1989 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Oct 25, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0953
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present method operates upon an optical disk type servo-system of the type having an optical tracking servo for maintaining a lens centered over a track on a disk and a tracking position servo for moving an optical head's lens to a desired position. Included within such a system is an eccentricity sub-system for providing a compensating sine wave signal for reducing errors in tracking due to disk decentering. The present method automatically adjusts the gain in one of the servos to match the gain appearing in the other servo so as to improve the smoothness of control when switching between the servos.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.