Patent ID: 6510112
Filing Date: 2003-01-21
Classification: G11B

Abstract:
An apparatus for driving an optical pickup for a tracking servo control, the apparatus comprising:an emitting device disposed in the optical pickup for emitting a main beam to a first position on an information track of a recording medium and emitting at least two subsidiary beams to a second position and a third position on the information track of the recording medium, respectively, the second position being different from the first position at least in a tangential direction of the recording medium, the third position being different from the first position at least in a tangential direction of the recording medium, the second position being different from the third position at least in a tangential direction of the recording medium; a tracking error signal generating device for generating a tracking error signal using returned light beams of the subsidiary beams from the recording medium; a driving device for moving the first position of the main beam and the second position and the third position of the subsidiary beams with respect to the recording medium; a tracking control device for outputting a driving signal based on the tracking error signal to the driving device; and a detecting device for detecting a damaged part on the recording medium, wherein the tracking control device comprises a pulse signal generating device for generating a pulse signal having a polarity opposite to a disturbance part of the driving signal generated due to at least one of the subsidiary beams passing on the damaged part, and the tracking control device uses the pulse signal as a part of the driving signal, wherein the tracking control device further comprises a signal maintaining device for setting a level of the driving signal at a hold level after the tracking control device uses the pulses signal as the part of the driving signal, and maintaining the hold level for a predetermined period of time, and the hold level is equal to a level of the driving signal in a state before the detecting device detects the damaged part.