OPTICAL DISC TRACKING CONTROL DEVICE, TRACKING CONTROL METHOD, AND TRACKING CONTROL PROGRAM

摘要

An optical disc tracking control device capable of performing stable tracking. The device includes a signal detection section for detecting a tracking error signal and a wobble signal from a light spot, a velocity detection section for detecting a relative moving velocity of the light spot and the track, a polarity judgment section for judging that the light spot position is between grooves when the wobble signal amplitude value is equal to or below a predetermined value in the vicinity of the zero cross point of the tracking error signal, a moving direction detection section for detecting the moving direction of the light spot with respect to the track from the increase/decrease direction of the tracking error signal when the moving velocity is within a predetermined range and polarity is judged to be between grooves, and a control section for reducing the moving velocity and performing tracking according to the moving velocity and the moving direction.