Tracking Control System for Optical Disk Drive Using Adaptive Learning Control Method

Abstract

In response to the recent demand for high density recording in an optical disc, "going narrow track" is now in progress. We have developed an adaptive learning control method capable of changing its learning ability in accordance with track correlation, with which we can avoid unnecessary learning during the vibration from the equipment and also the lack of stability which is the problem for learning control, and furthermore we can increase follow-up ability. As a result we have confirmed that track-error could be minimized almost to a "0" level and stabilized operation with repetitive learning control system could be achieved.