Method and apparatus for controlling track kick for optical disk drive
US5757746A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Mar 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08505
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A matrix circuit receives, as inputs, signals after opto-electrical conversion of reflected light of three light beams of the plus first, 0-th and minus first order light beams from the optical disk. Based on the signals, four tracking error signal are produced by the matrix circuit. Zero cross calculator detects zero cross points of the four tracking error signals, whereby movement of the beam spot formed of the light beams is monitored with points at 1/4, 2/4, 3/4 and 4/4 of a track pitch. Here, recording or reproduction is performed on both lands and grooves. The mute state of a tracking servo is released at a timing when the beam spot passes through a point at 2/4 of the track pitch and the polarity of the tracking servo is changed over at this timing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.