Improvement of Performance of a Tracking Servo System for an Optical Disk Drive.

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  • Arai Kiyotaka
    Recording Technology and Mechanical Engineering, NHK Science and Technical Research Laboratories,<BR> Kinuta 1-10-11, Setagaya, Tokyo 157-8510, Japan
  • Okumura Hideyo
    Recording Technology and Mechanical Engineering, NHK Science and Technical Research Laboratories,<BR> Kinuta 1-10-11, Setagaya, Tokyo 157-8510, Japan
  • Tokumaru Haruki
    Recording Technology and Mechanical Engineering, NHK Science and Technical Research Laboratories,<BR> Kinuta 1-10-11, Setagaya, Tokyo 157-8510, Japan
  • Ohishi Kiyoshi
    Nagaoka University of Technology, Kamitomioka-cho 1603-1, Nagaoka, Niigata 940-2188, Japan

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A tracking servo system for high-speed and precise tracking control is proposed. An optical disk camera-recorder to record and retrieve high-definition television signals is being developed. The camera-recorder must have both a high data transfer rate and a large capacity. These requirements will be fulfilled by narrowing the track pitch on the disk and by increasing the disk rotation speed. Generally, optical disks have a radial run-out of up to approximately 100 μm peak-to-peak. The tracking servo system must have precise control for the narrow track pitch and high-speed control for the high disk rotation speed. To meet these requirements, we propose a tracking servo system consisting of a feedback controller and of a feedforward controller which employs a pre-compensator applying the zero phase error tracking method. The simulation results show reduction of the residual tracking error and also an increase in the disk rotation speed.

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