Patent ID: 8427914

Claim:
A lens pull-in method, comprising steps of: driving a lens towards an optical disc in an open loop control state when the lens is in a far-field range; determining whether the lens enters a near-field range; switching to a close loop control state to drive the lens to aim at a targeting gap error signal level once the lens enters the near-field range at a first time point; setting the targeting gap error signal to a first level at the first time point, and driving the lens to aim at the first level during a first time period, wherein the first time period starts from the first time point and ends at a second time point; setting the target gap error signal to a second level at the second time point, and driving the lens to aim at the second level during the a second time period, wherein the second time period starts from the second time point and ends at a third time point, the second level is higher than the first level, the lens reaches to the first level at the second time point, and the lens overshoots the first level during the second time period; and setting the target gap error signal back to the first level at third time point, and driving the lens to aim at the first level during the a third time period, wherein the third time period starts from the third time point, the lens reaches to the first level at the third time point.