Optical disc device and tracking servo control circuit therefor
US8406100B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2011 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Feb 18, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/094
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical disc device, a way of canceling a lens shift due to an electric offset of an output of a tracking actuator driving circuit is desired. A tracking servo control circuit contains a first operation mode for setting an output current of the tracking actuator driving circuit to generally zero and a second operation mode for supplying a predetermined potential to the input. An average potential of a push-pull signal detected in the first operation mode is acquired. An object lens is moved by a predetermined amount in both radial directions by changing a potential supplied in the second mode to acquire correlative relationship between average potential of a push-pull signal relative to a lens movement amount and the supplied potential. An offset amount is acquired from the potential and the correlative relationship to cancel the offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.