Patent ID: 7898912

Claim:
An integrated circuit, provided in an optical disk device, for generating according to a tracking error signal a tracking driving signal indicating the amount of movement of an objective lens provided in an optical pickup, and for performing tracking control for moving the objective lens according to the tracking driving signal, the integrated circuit comprising: an offset amount obtaining section configured to perform an offset amount obtaining operation for obtaining a difference between a middle value of the amplitude of the tracking error signal and a predetermined reference value as an offset amount; an offset amount attenuation section configured to perform an attenuation operation for attenuating the offset amount obtained by the offset amount obtaining section to obtain an attenuated offset amount; and an observer configured to perform an estimation operation for estimating the offset amount according to the tracking driving signal to obtain an estimated offset amount, wherein the offset amount obtaining section performs the offset amount obtaining operation before the tracking control is initiated; and after the initiation of the tracking control, the offset amount attenuation section initiates the attenuation operation, while the observer initiates the estimation operation with an initial value of the estimated offset amount being 0, and the tracking error signal is corrected by using the attenuated offset amount obtained by the offset amount attenuation section and the estimated offset amount obtained by the observer.