Patent ID: 8121000

Claim:
An optical disk apparatus comprising an optical pickup and a signal processor, wherein the optical pickup comprises: an actuator for driving an object lens; and a sensed signal output part for outputting a sensed signal to the signal processor, the signal processor comprises: a servo signal generator for generating a tracking error signal and a lens error signal by conducting addition/subtraction of the sensed signal supplied from the sensed signal output part; and a tracking offset correction quantity signal generator which is input with the lens error signal to output a tracking offset correction quantity signal; wherein DC (direct current) offset correction is conducted by conducting addition/subtraction between the tracking error signal and both the lens error signal and the tracking offset correction quantity signal; wherein the tracking offset correction quantity signal generator comprises storage means for storing a plurality of tracking offset correction values respectively associated with a plurality of lens shift positions; and wherein the plurality of tracking offset correction values respectively associated with the plurality of lens shift positions are stored in the storage means by learning operation before start of reproducing operation or before start of recording operation.