Digital tracking servo system with multi-track seek
US6781929B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2001 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Dec 26, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08576
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A servo system with a multi-track seek algorithm is presented. The multi-track seek algorithm detects zero crossings in a tracking error signal, counts the number of zero crossings to form a count, and calculates a reference velocity from the count. The algorithm also determines a time period between successive zero crossings, calculates a velocity from the time period, calculates a difference signal between the reference velocity and the velocity, and adjusts the control signal so that the velocity follows the reference velocity. The reference velocity can follow a velocity profile with acceleration portions, coasting portions, and deceleration portions which move an optical pick-up unit from a starting position to a target position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.