Patent ID: 6222802
Filing Date: 2001-04-24
Classification: G11B

Abstract:
A device for automatically controlling a sled loop gain of a sled motor in an optical disc drive which drives an optical disc, comprising:a pickup to irradiate a laser beam onto the optical disc and to receive a reflected beam to read a signal recorded on the optical disc, to generate a read signal;a tracking error detector connected to said pickup, to detect a tracking error signal from said read signal;a phase compensator connected to said tracking error detector, to compensate for a phase deviation of said tracking error signal;a first lowpass filter connected to said phase compensator, to control said phase-compensated tracking error signal according to a fixed gain, to generate a gain controlled signal;a controller to cause said pickup to jump a plurality of tracks when the laser beam is on-track, and to determine a sled loop gain for controlling the gain controlled signal output from said first lowpass filter to be changed to a minimum driving voltage upon completion of said track jump;a second lowpass filter to control the gain controlled signal output from said first lowpass filter according to the sled loop gain generated by said controller, to generate a drive signal; anda sled motor driver to drive the sled motor according to the drive signal output from said second lowpass filter.