Patent ID: 7327656

Claim:
An optical disk device comprising: a spindle motor rotationally driving an optical disk; an optical pickup projecting a light on the rotating optical disk so as to record or reproduce information; a tilt detection part detecting a relative tilt between the optical disk and said optical pickup; an optical-pickup-position detection part detecting a position of said optical pickup in a radial direction of the optical disk; a tilt storage part for storing tilt detection data output from said tilt detection part; a tilt correction part correcting the tilt according to the tilt detection data stored in said tilt storage part; and a control part performing controls for moving said optical pickup to a plurality of measuring positions set beforehand in the radial direction of the optical disk prior to recording or reproducing the information, for detecting the tilt with said spindle motor being rotated so that a linear velocity at each of said measuring positions equals a linear velocity upon actually recording or reproducing the information thereat, and for storing the tilt detection data in said tilt storage part, wherein when a predetermined time elapses after detecting the tilt at each of said measuring positions and storing the tilt detection data in said tilt storage part, the tilt at each of said measuring positions is detected again, and the tilt detection data stored in said tilt storage part is updated.