Optical disk tracking servo circuit enabled to compensate for non-continuous track segments or prolonged defect
US7336569B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 2004 |
| Grant date | Feb 26, 2008 |
| Priority date | — |
| Expiry date | Dec 9, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention pertains to an improvement for a tracking and focusing servo and defect management circuit that controls the tracking and focusing of an optical head on an optical media in an apparatus for reproducing a data, sound or image recorded on the optical media. The invention characterizes by the provision of a circuit for managing modulation of an RF signal from the optical pickup head caused when the optical pickup head encounters a non-continuous track in segment arrangement or a very long extended defect such as a extended flaw in the disc resulted discontinuous track segment thereon, and an adjusting circuit which manages the loop gain of the tracking servo circuit per the track arrangement of defect detection and a tracking profile, whereby the responsiveness of the optical pickup head is improved and track skipping prevented or recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.