Optical disc apparatus
US7551529B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 2006 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Jan 15, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0941
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical disc apparatus, the amplitude level of a focus error signal for performing focus search is measured, and in order to bring the measured amplitude level of the focus error signal to a target value, gains of focus servo drive amplifiers which amplify respective detection signals from four respective divided detection regions of an optical detector are set as initial values. As a result, the amplitude level of the focus error signal is adjusted at the target value. Next, the amplitude levels of the detection signals from the respective detection regions are measured, and the gains of the respective focus servo drive amplifiers are adjusted individually so that crosstalk can be cancelled based on the measured amplitude levels of the detection signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.