Patent ID: 6952383

Claim:
An optical disc drive for accessing data stored on an optical disc comprising: a sled inside the optical disc drive, and the sled sliding relative to the optical disc; an actuator on the sled, the actuator wobbling relative to the optical disc; a light source disposed on the sled and optically coupled to the actuator for generating focus error signals; control circuitry for controlling the optical disc drive, the control circuitry comprising a focus compensation device for compensating focus errors caused by wobbles of the optical disc generated during rotations of the optical disc; and a high frequency compensator for compensating focus errors caused by wobbles of the optical disc generated during the optical disc rotated at a frequency higher than a predetermined frequency; wherein the focus compensation device controls the actuator to wobble upward and downward according to wobbles of the optical disc so as to substantially keep up wobbles of the actuator with the wobbles of the optical disc; and wherein when the optical disc is rotated at a frequency higher then the predetermined frequency, the high frequency compensator controls the actuator to wobble upward and downward so as to substantially keep up the wobbles of the actuator with the wobbles of the optical disc.