Method for determining track searching direction
US7616535B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2007 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Jun 25, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08505
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for determining a track searching direction is disclosed. The method takes advantage of the characteristic that the movement of the photo-diode with respect to the optical disk is not perpendicular to the track direction. Therefore, the phase difference between the front side and the rear side of the photo-diode could be used to define a seeking error signal. The seeking error signal is used, together with a tracking error (TE) signal and a radio frequency ripple (RFRP) signal, to determine the track searching direction. Because the seeking error signal has a better signal-to-noise ratio, the phase lead or lag can be determined more accurately. As a result, the accuracy of detecting the track searching direction on a blank disk is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.