Patent ID: 7915569

Claim:
A method for calibrating a focus level on a light scribe disc, comprising: (1) driving a pick-up head with a predetermined speed in a predetermined direction to calibrate a focus level for a moving stage; (2) detecting light summed signals along the path of the moving stage; (3) finding and recording a maximum among the light summed signals and a corresponding position of the pick-up head as the focus level of each moving stage, at each corresponding position; (4) counting a number of moving stages; (5) checking if the number of moving stages is greater than a predetermined value, and when yes, entering step (7), and otherwise, entering a next step; (6) lowering the predetermined speed in step (1) with a reduction and changing the direction to be opposite to the predetermined direction, and returning to step (1); (7) determining the focus level of the moving stage having the maximum light summed signal recorded in step (3) as an optimum focus level; and (8) finishing calibrating.