Patent ID: 8477574

Claim:
An optical disk device that is compatible with optical disks including three or more recording layers on one side, the optical disk device comprising: an optical pickup that shines light on an optical disk and that detects light reflected from the optical disk using a photodetector; a tracking error signal generation device that generates a tracking error signal by processing an electrical signal that is output from the photodetector; and a movable lens position adjustment device that controls adjustment of a position of a movable lens for spherical aberration correction disposed in the optical pickup; wherein when the optical disk including three or more recording layers on one side is inserted into the optical disk device, the movable lens position adjustment device performs adjustment using as an index the tracking error signal provided with a limit to an amount of movement of the movable lens for spherical aberration correction at start-up of the optical disk device and sets an upper limit to a number of retries of the adjustment at the recording layer farthest away from a side on which a laser beam is incident to 1 or more.