Patent ID: 7821886

Claim:
An optical disc device comprising: an optical pickup for irradiating an optical disc with laser beam and detecting reflected light formed by the laser beam reflected by the optical disc so as to generate a received light signal; optical pickup driving means for driving the optical pickup in a radial direction of the optical disc; traverse signal generation means for generating a traverse signal forming a pulse at the optical pickup's crossing a track provided on the optical disc by binarizing the received light signal based on a predetermined binary threshold; movement control means for recognizing moving amount and moving speed of the optical pickup based on the traverse signal and for controlling the optical pickup driving means based on the recognition result so as to make the optical pickup seek to a target address of a seek destination; and abnormality monitoring means for sending an abnormality notice to the movement control means when pulse interval of the traverse signal becomes longer than a predetermined pulse interval threshold, wherein the movement control means temporarily stops the optical pickup in accordance with the abnormality notice, after temporarily stopping the optical pickup in accordance with the abnormality notice, the movement control means estimates a present address of a temporary stop position of the optical pickup based on a pulse number count value of the traverse signal when the pulse interval of the traverse signal becomes longer than the pulse interval threshold, changes a spindle rotational speed or read clock in accordance with the estimated temporary stop position, reads the present address of the estimated temporary stop position, and calculates a number of physical tracks for seeking to the target address of the seek destination based on the read present address and the target address of the seek destination.