Pickup control method and apparatus, and disk unit with gain control during power save mode
US5715218A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1996 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Apr 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0941
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pickup control method is used to control a pickup of a reproducing unit which reproduces information from a recording medium. The pickup control method includes the steps of (a) controlling a gain of a tracking error signal in a tracking servo system during a power save mode of the reproducing unit so that the gain is reduced in the power save mode in which the reproducing unit operates at a reduced power consumption compared to a normal operation mode, where the tracking servo system controls tracking of the pickup based on the tracking error signal so that the pickup follows a track on the recording medium, and (b) controlling a phase characteristic of a phase compensation means, provided in the tracking servo system, for compensating a phase of the tracking error signal so as to secure a phase margin at a zero-crossing point of the gain in an open loop characteristic of the tracking servo system during the power save mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.