Patent ID: 8391112

Claim:
An optical disk apparatus driving an optical disk, the optical disk apparatus comprising: tilt-angle adjusting means for adjusting a tilt angle indicating the tilt of an optical axis of laser light emitted from a pickup to detect an optimal tilt angle at which a traverse signal has the maximum amplitude, the pickup irradiating the optical disk with the laser light and outputting a radio-frequency signal and a tracking error signal depending on reflected light of the laser light reflected from the optical disk, the traverse signal being the tracking error signal when tracking control is inactivated; storing means for storing information about the optimal tilt angle; and adjusting means for adjusting a focus bias used for correcting a focus error signal for controlling a focus of the laser light and an aberration correction value used for correcting spherical aberration of the pickup, wherein when the optical disk has a plurality of recording layers on one side, the tilt-angle adjusting means adjusts the tilt angle with respect to each of the plurality of recording layers to detect the optimal tilt angle and the storing means stores information about the optimal tilt angle with respect to each of the plurality of recording layers, the tilt angle with respect to each of the plurality of recording layers is controlled in accordance with the information about the optimal tilt angle with respect to each of the plurality of recording layers stored in the storing means, and the adjusting means adjusts the focus bias and the aberration correction value to traverse-maximized adjustment values at which the traverse signal has the maximum amplitude at a position toward an inner circumference of the optical disk and stores the adjusted focus bias and the aberration correction value.