Method and apparatus for correcting the loop gain of a servo loop in accordance with measurements during open-loop operation
US4878211A · kind A · utility
109Cited by
30References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 1987 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | May 26, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0941
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A servo loop particulary useful for a focusing or tracking servo in an optical disk. The peak-to-peak value of an error signal in the servo loop is detected while the optical pickup is being driven perpendicularly to the disk in focusing or transversely to the disk in tracking. The detected peak-to-peak value is used to adjust the gain of a variable gain amplifier included in the servo loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.