Patent ID: 7187632

Claim:
An optical disk device comprising: an optical pickup that records information on an optical disk or reproduces information from the optical disk, the optical disk being attached to the optical disk device; a tilt sensor that is provided on the optical pickup and detects inclination of the optical disk in terms of a radial direction of the optical disk; a tilt detection circuit that detects an output of the tilt sensor; an objective lens that is provided on the optical pickup and focuses laser light on the optical disk; tilt driving means for inclining the objective lens in terms of the radial direction by an amount corresponding to a driving signal; a tilt driving circuit that applies the driving signal to the tilt driving means based on a control signal; tilt control means for providing the control signal to the tilt driving circuit based on an output of the tilt detection circuit; reference tilt value storing means for storing a reference output of the tilt detection circuit as a reference tilt value, the reference output of the tilt detection circuit being based on a reference optical disk having a warping amount equal to or smaller than a predetermined value; reference control value storing means for storing as a reference control value a reference control signal corresponding to a reference driving inclining amount in which inclining the objective lens by the reference driving inclining amount minimizes or reduces inclination of the objective lens relative to the reference optical disk; wherein the tilt control means is adapted to provide the control signal to the tilt driving circuit, wherein the control signal is determined by multiplying a difference between the output of the tilt detection circuit and the reference tilt value by a predetermined control constant, and adding the reference control value to the multiplied difference.