Patent ID: 7145845

Claim:
A carriage servo control system for servo-controlling a movement of a carriage device in a direction transverse to a track formed on a recording medium, in which the carriage device has a detecting device mounted thereon for transmitting an optical beam to the track so as to perform at least one of recording and reproduction of information on and from the track, said carriage servo control system comprising: an input terminal for receiving a tracking equalizer signal indicative of a phase compensated error between a focus position of the optical beam and a target track position; a pulse producing unit for producing a periodic signal that has a constant period; an averaging unit for producing an averaged equalizer signal based on the tracking equalizer signal; a multiplier for producing a drive signal for driving said carriage device based on at least a sample of the averaged equalizer signal generated by the averaging unit and the periodic signal generated by the pulse producing unit or based on the averaged equalizer signal generated by the averaging unit and at least a periodic sample of the periodic signal generated by the pulse producing unit; and an output terminal for outputting the drive signal produced by the multiplier to control the movement of the carriage device.