Control circuit of optical disk system to improve transition for seek control to tracking control

摘要

A control circuit of an optical disk system has a tracking and seek control means for: controlling a position of a light beam emitted for recording and playing information to/from a track on an optical disk by driving a tracking actuator based on a tracking error signal representing at least positional difference between the light beam and the track; selectively performing seek control for controlling the light beam so that the light beam may traverse the track for moving the light beam to the destination track, and tracking control for controlling the light beam so that the light beam may follow the track; and outputting a brake pulse and moving control to the tracking control at the completion of the brake pulse at the completion of the seek control, wherein a width t of the brake pulse is set as follows:PPt 2d/V P Pwhere v is a goal value of a speed and d is a residual distance of the light beam to the destination track at the beginning of outputting the brake pulse.