Patent ID: 6813227
Filing Date: 2004-11-02
Classification: G11B

Abstract:
An optical recording medium drive servo system of an optical recording/reproducing apparatus having a head, the system comprising:an actuator moving a position of the head for recording data on a recording medium or reproducing the recorded data from the recording medium; an error detector detecting a position error comprising a difference between a reference position on the recording medium and an actual position of the head; a compensator receiving the position error from the error detector and producing a value therefrom to drive the actuator; a first memory storing control inputs for compensating for the position error of the actuator due to a disturbance; a second memory converting the control inputs of the first memory according to a phase and storing converted control inputs; a timing controller generating addresses for the first memory and the second memory according to the phase; and an adder adding the control inputs of the first memory or the converted control inputs of the second memory to the driving value from the compensator and providing a resulting sum to the actuator to compensate for the disturbance.