Patent ID: 7295497

Claim:
A tilt correction processing method for correcting a tilt value as an inclination of an optical disk with respect to an optical axis of a laser beam which is irradiated to each layer of a plurality of recording/reproducing layers of the optical disk by an optical disk device for recording or reproducing information, wherein: different tilt values are set within a predetermined range at a predetermined radius position of a certain recording/reproducing layer arranged at the farthest distance from the laser beam irradiation side so that an optimal tilt correction value is obtained according to a calculation value of a predetermined signal obtained from a reflected light from said certain recording/reproducing layer at the farthest distance of the optical disk in each of the tilt values, wherein no tilt correction value is obtained from the other recording/reproducing layers other than said certain recording/reproducing layer arranged at the farthest distance from the laser beam irradiation side, and wherein the optimal tilt correction value obtained from said certain recording/reproducing layer is applied to the other recording/reproducing layers other than said certain recording/reproducing layer at the farthest distance from the laser irradiation side, as well as being applied to said certain recording/reproducing layer at the farthest distance from the laser beam irradiation side.