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An Improved Tracking Servo System in Optical Disk Drives  

Lee, Tae-Gyu (Hanyang University, Department of Electrical Engineering)
Jeong, Dong-Seul (Hanyang University, Department of Electronics and Computer Engineering)
Chung, Chung-Choo (Hanyang University, Division of Electrical and Biomedical Engineering)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.44, no.4, 2007 , pp. 67-73 More about this Journal
Abstract
An optical pick up generally has coupled dynamics between focusing and tracking servos. The coupled dynamics reduces tracking performance of optical disk drives. A conventional control method is holding the previous tracking control command in the presence of surface defect. The method has a long settling time. If the defective area is getting larger, objective lens will get away from the following track. In order to overcome this problem, this paper proposed a new control method for optical disk drives based on a prediction of tracking error and focusing error. We present how to compensate the coupled dynamics so that reduced setting 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.
Keywords
Optical disk drive; Disk surface defect; Coupled dynamics; Tracking servo;
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