Optical disk drive and method for controlling sled motor within optical disk drive

An optical disk drive comprising:

• an optical pickup including a tracking actuator driving an objective lens positioned opposed to an optical disk;
• a sled motor designed to move said optical pickup across said optical disk;
• and
• a control system controlling said sled motor including:
• an RF circuitry developing a tracking error signal in response to an output of said optical pickup;
• a tracking filter developing a tracking drive data corresponding to a displacement of said tracking actuator from said tracking error signal;
• a sled filter developing an output corresponding to low frequency components of said displacement of said tracking actuator;
• a pulse generating unit generating drive pulses for driving said sled motor in response to said output of said sled filter being out of a predetermined dead zone;
• and
• a pulse waveform adjusting unit designed to adjust waveforms of said drive pulses,
• wherein said pulse waveform adjusting unit adjusts a waveform of a relevant one of said drive pulses in response to said output of said sled filter and polarity of previous ones of said drive pulses.

A method for controlling a sled motor comprising:

• developing an output data corresponding to low frequency components of displacement of a tracking actuator;
• and
• generating drive pulses for driving a sled motor in response to an output of a sled filter being out of a predetermined dead zone,
• wherein a waveform of a relevant one of said drive pulses is adjusted in response to said output of said sled filter and polarity of previous ones of said drive pulses.