Error signal detection apparatus and reproduction signal detection apparatus for optical recording/reproducing system and method therefor
US6507544B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2000 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Nov 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/131
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An error signal detection apparatus for an optical recording/reproducing system which detects a tilt error signal and/or tracking error signal, based on the phase characteristics of light reflected and diffracted from a recording medium, and a method therefor. The error signal detection apparatus includes multiple photodetectors and a circuit unit for detecting an error signal by processing detection signals generated by each photodetector The the photodetectors are arranged in a matrix wherein a row or column of the matrix is parallel to a direction corresponding to a direction of an information stream on the recording medium. A circuit unit compares the phases of the detection signals of the inner and/or outer light receiving portions arranged in the same row or of detection signals from diagonal positions on the matrix to output at least one of a tilt error signal and a tracking error signal based on the phase comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.