Patent ID: 7830758

Claim:
An optical disk drive for performing at least one of recording and reproducing an information signal on an optical disk having one or more information recording layers stacked one another on which the information signal is one of recorded and to be recorded in a predetermined track format, comprising: focusing means for condensing a light beam on the optical disk; moving means for moving the focusing means in a direction perpendicular to a track direction of the optical disk; light detection means having a first light acceptance section accepting a light beam obtained as a result of reflection of the light beam condensed on the optical disk by the focusing means by one of the one or more information recording layers and a second light acceptance section accepting stray light obtained as a result of reflection of the light beam by another of the one or more information recording layers; tracking error signal generating means for generating a first tracking error signal representing a relative displacement between a track of the one of the information recording layers and the light beam using an output of the first light acceptance section, and correcting the first tracking error signal using an output of the second light acceptance section; and tracking control means for performing tracking control by driving the moving means in accordance with the first tracking error signal generated and corrected by the tracking error signal generating means, wherein the light beam from the optical disk to the light detection means has a track direction of the optical disk on the light detection means even if a position of the first light acceptance section in an optical axis direction is changed, the second light acceptance section comprises a disk inner circumferential side area and a disk outer circumferential side area respectively disposed at positions in the light detection means, which are symmetrical about the track direction in the one of the information recording layers, and where the stray light from the another of the information recording layers is accepted without accepting the light beam from the one of the information recording layers, and the tracking control means performs correction for removing an offset in the first tracking error signal caused by the stray light from the another of the one or more information recording layers using a difference between an output of the disk inner circumferential area and an output of the disk outer circumferential area in the second light acceptance section.