Disc control device
US7869314B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2006 |
| Grant date | Jan 11, 2011 |
| Priority date | — |
| Expiry date | Nov 14, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0953
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A defect detection unit (5), a disc position detection unit (9), and a disc rotation speed detection unit (1) are in a disc control device which includes a repetition control device to control storing to and reading from a memory unit (3) functioning as a learning memory and for varying the number of memory divisions of the memory unit (3) on the basis of detection by the detection units. Components having periodicity apparently due to partial surface runout or partial eccentricity are stored in memory unit (3) by increasing the resolution and microscopic noise components, and noise components having no periodicity are not stored in memory unit (3). This system carries out stable focus tracking control even when disturbances such as device vibration or scratches on a disc are mixed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.