Patent ID: 7088646

Claim:
A track search control circuit comprising: an optical pickup for emitting and moving a light beam in the radial direction of an optical disc to write information signal into the optical disc or read the information signal therefrom; a track traversing signal generation circuit configured to detect, when the light beam emitted from the optical pickup moves in the radial direction of the optical disc, the light beam having traversed a track of the optical disc, and generate a normal direction on-track signal in an on-track period when the light beam traverses a zone of the track in a track search direction defined by a system controller and a normal direction off-track signal in an off-track period when the light beam traverses a zone between the tracks; a first time measurement circuit configured to start time measurement at a time when the on-track signal is generated by the track traversing signal generation circuit; a second time measurement circuit configured to start time measurement at a time when the off-track signal is generated by the track traversing signal generation circuit; a velocity error signal generation circuit configured to detect an error between a relative moving velocity of the light beam of the optical disc to the track and a target velocity based on a measurement outputted by the first time measurement circuit and a measurement outputted by the second time measurement circuit to generate an error signal; and a correction circuit configured to correct the moving velocity of the light beam in the radial direction based on the error signal generated by the velocity error signal generation circuit.