Signal operational circuit for a multi-beam pick-up device
US6353583B1 · kind B1 · utility
3Cited by
4References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1999 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Mar 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0908
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a large scale integrated circuit (LSI) for calculating servo signals (e.g., a focusing signal, a tracking signal, etc.) from the output signals received from a plurality of photo detectors, as used within an optical disk apparatus. The invention provides a switching circuit and a gain changing circuit coupled to the LSI such that a single LSI may be used for at least two different photo detector configurations as may be found in at least two different pick-up devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.