Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2007.04a
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- Pages.137-139
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- 2007
An Improved Tracking Servo System in Optical Disk Drives
광디스크 드라이브의 개선된 트래킹 서보 시스템
- Published : 2007.04.27
Abstract
In optical disk drives, a conventional control method in the presence of surface defect is holding the previous tracking control command. It is known that the method has a long settling time. This paper proposes a new control method which reduces the settling time. An optical head generally has coupled dynamics between focusing and tracking servo system. We present how to compensate the coupled dynamics so that reduced settling time is achieved. It is verified by experiments that the proposed method brings an improved performance in the presence of surface defect as well as in the normal operating condition.