Patent ID: 8675459

Claim:
An optical disk apparatus comprising: an optical pickup, wherein the optical pickup includes: a light source, an objective lens configured to collect a laser beam emitted from the light source and apply the laser beam onto an optical disk, an actuator configured to drive the objective lens, and a photodetector configured to detect reflected light from the optical disk and output a photodetected signal; and a signal processing circuit, wherein the signal processing circuit includes: a servo signal generator configured to generate a tracking error signal and a lens error signal from the photodetected signal outputted from the photodetector, a lens error deviation signal memory circuit configured to store the lens error signal generated at the servo signal generator and reproduce a deviation of the lens error signal in synchronization with disk rotation, and a tracking error signal corrector configured to receive the tracking error signal and learn and generate an amplitude correcting value that corrects an amplitude deviation of the tracking error signal; wherein the amplitude correcting value for the tracking error signal learned at the tracking error signal corrector is acquired from a tracking error signal detected in reproducing the deviation of the lens error signal; wherein the tracking error signal corrector includes a correcting signal generator configured to store the amplitude correcting value or the offset correcting value for the tracking error signal at a plurality of disk rotation angles in synchronization with rotation of the optical disk in a learning operation; and wherein in a recording operation or a readout operation, a correcting value corresponding to a disk rotation angle to be a subject to the recording and readout operations is read out of the correcting signal generator in synchronization with rotation of the optical disk, and a tracking error signal is corrected.