High speed precision seek servo system

摘要

Disclosed is a high-speed precision seek servo system which improves the positioning accuracy of the seek operation in the optical disc drive device so that the track retracting operation of the desired target position can be made at high speed and stability. The system of the present invention includes a first selector for alternately selecting and outputting a tracking error signal (TES) and an RF-envelope signal at predetermined intervals, an A / D converter for converting a signal selected from the first selector into a digital form, and A A subtractor for subtracting the output signal of the / D converter from the reference signal to obtain the difference, two gain regulators for gain control by opposing the difference signal, and two opposing difference signals according to the speed section A second selector for outputting a digital servo control signal, a compensator for outputting a digital servo control signal for compensating for an error in seek operation in response to the signal selected by the second selector, and converting the digital servo control signal into an analog form and outputting it as a pickup. It consists of a D / A converter. Therefore, the present invention obtains a servo control signal without an open loop by using a tracking error signal and an RF-envelope signal, and moves the pickup position. Therefore, the track retracting operation is stable even for a relatively large and high change rate of disk eccentricity. This provides an effect of improving the reliability of the optical disk drive.