Patent ID: 8014240

Claim:
An optical disk device comprising: a light beam emitting section emitting a light beam; a light beam converging section converging the light beam on an information layer in an optical disk having a mark or a pit; a moving section moving the light beam converging section; a light receiving section receiving reflected light from the information layer in the optical disk, the light receiving section having a plurality of light receiving areas; a tracking error detecting section detecting misalignment between a light spot formed on the information layer by the light beam and the mark or pit, on the basis of signals from predetermined ones of the light receiving areas of the light receiving section; a focus error detecting section detecting level of convergence of the light beam on the information layer on the basis of signals from predetermined ones of the light receiving areas of the light receiving section; a correcting section using an output from the tracking error detecting section to correct a signal output by the focus error detecting section; and a focus control section controlling the moving section so that the light beam converges on the information layer, on the basis of a signal from the correcting section, wherein the tracking error detecting section detects the misalignment on the basis of phase information obtained from the signals received from the predetermined light receiving areas, and the correcting section performs a correcting operation of removing a signal component from the predetermined light receiving areas of the light receiving section which component is used by the tracking error detecting section, the signal component being contained in the signals from the predetermined light receiving areas of the light receiving section which signals are used by the focus error detecting section, the signal component corresponding to optical crosstalk, an interlayer movement control section which, when the optical disk has a plurality of the information layers, controls the moving section so that a convergent point of the light beam moves from any of the information layers to another of the information layers, and wherein the correcting section performs the correcting operation on the basis of an operation of the interlayer movement control section.