OPTICAL DISK SIGNAL POCESSING UNIT, OPTICAL DISK DATA REPRODUCING AND RECORDING DEVICE, AND OPTICAL DISK SIGNAL POCESSING METHOD

摘要

An optical disk signal processing unit (200) performs the tracking control for controlling a position of a convergent lens (103) on an optical pickup (100) in accordance with the tracking error signal and the track jump operation for moving the convergent lens (103) on the optical pickup (100) in the radial direction of an optical disk (500) while stopping the tracking control. A gain increment computing section (209) determines the loop gain increment of a tracking control system in accordance with the eccentric velocity of the optical disk (500) at the time of the track jump. Upon completion of the track jump operation, the tracking control is carried out in a state where the loop gain of the tracking control system is increased by the increment determined by the gain increment computing section (209).