OPTICAL DRIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical drive device which can switch over to a tracking servo by a DPP method upon an irradiation point of an optical beam coming into a non-recorded area when reproducing a disk while maintaining an on-track state by performing tracking servo by a DPD method. SOLUTION: The optical disk device reproduces an optical disk having a land and a groove, and includes a tracking-error-signal generating part 61-1 that generates a tracking error signal TEDPDby using a DPD method, a tracking-error-signal generating part 61-2 that generates a tracking error signal TEDPPby using a DPP method, a tracking servo part 62 that controls an optical system, and a determining part 63 that determines that the irradiation point of an optical beam is a non-recorded area. The tracking servo part 62 switches control based on the tracking error signal TEDPDto control based on the tracking error signal TEDPPaccording to the result of ongoing determination of the determining part 63. COPYRIGHT: (C)2011,JPO&INPIT