Patent ID: 6975566

Claim:
A servo method for an optical recording medium for performing a tracking servo and sled servo by receiving an electric signal in proportion to a quantity of reflected light outputted from an optical pickup and detecting a tracking error signal by a push-pull method, the method comprising the steps of: (a) detecting an amount of offset per track as moving an object lens of the optical pickup in a specified direction; and (b) performing the tracking servo by generating a tracking drive signal as compensating for the amount of offset with respect to the tracking error signal during a normal servo operation, wherein the step (a) comprises the steps of: detecting a first tracking drive signal as performing a still function in a reference position where no object lens shift is performed after turning on the tracking servo and turning off a sled servo; detecting a second tracking drive signal as performing a still function after performing an n-track jump through the object lens shift in either of inner and outer periphery directions from the refernce position; detecting a third tracking drive signal as performing a still function after performing a 2n-track jump through the object lens shift in a direction opposite to the direction at the second tracking drive signal detection step; and detecting the amount of DC offset per track generatee through the object lens shift from the first to third tracking drive signals obtained at the tracking drive signal detection steps.