Patent ID: 7447125

Claim:
A method for adjusting a tilt-angle of a lens disposed in a sled of an optical pick-up head, the method comprising: receiving a position deviation of the lens against the sled; generating a tilt control parameter set according to the position deviation; and controlling the lens according to the tilt control parameter set, so that the lens maintains horizontal with reference to the sled, wherein the step of generating the tilt control parameter set is performed according to a tilt-angle table which is generated according to steps comprising: shifting the lens to a target shift position against the sled; determining a plurality of test tilt control parameter sets; controlling the lens according to the test tilt control parameter sets respectively, and correspondingly receiving a plurality of tracking error signals outputted by the optical pick-up head; examining the tracking error signals to find out the one with smallest amplitude; and generating the tilt-angle table according to the target shift position and the test tilt control parameter set corresponding to the smallest-amplitude tracking error signal.