The control performance improvement of the optical disk system by correction pulse control

This paper proposes a control system which improves OPU (Optical Pick Up) control performance in an optical disk system. This system can be realized by adding a correction pulse control block which is based on a position error signal onto a conventional position control loop composed of the PID control rule. Using this function, the position error resulting from a physical distortion and acceleration disturbance to the disk can be decreased sharply. Furthermore, this system can decrease the deviation caused by the shock disturbance which cannot be controlled by the PID control rule. In addition, it becomes possible to decrease the overshoot in the impulse response sharply, and realize stable capture of a target position. Since this system can be created with a simple algorithm, it is possible to use it in a wide range of applications. © 2007 Wiley Periodicals, Inc. Electr Eng Jpn, 160(2): 53–67, 2007; Published online in Wiley InterScience ( www.interscience. wiley.com ). DOI 10.1002/eej.20570