Patent ID: 7177240

Claim:
An optical disc system comprising: an optical pickup that radiates a laser beam onto the optical disc to detect light reflected from the optical disc, wherein the optical pickup comprises a tracking actuator, a focus actuator, and an objective lens; a radio frequency amplifier that converts the reflected light into an electric signal to output a track-related signal; a sled motor that moves the optical pickup toward an inner or outer perimeter of the optical disc in response to a sled servo drive signal; a servo driver that outputs the sled servo drive signal and a tracking servo drive signal in response to one of a first servo control signal, and a second servo control signal; and a servo signal processor that comprises an optical pickup movement determiner and outputs one of the first servo control signal and the second servo control signal, the optical pickup movement determiner determining from the track-related signal whether tracks are detected on the optical disc at a current position of the optical pickup and outputting a track determination signal indicating whether the optical pickup has moved to the innermost perimeter of the optical disc, based on the determination result, wherein the tracking actuator moves the objective lens toward the inner or outer perimeter of the optical disc in response to the tracking servo drive signal.