Patent ID: 6834030
Filing Date: 2004-12-21
Classification: G11B

Abstract:
An optical disk apparatus comprising:a light irradiator operable to converge a light beam and irradiate an information carrier with the converged light beam; a moving means operable to move the light beam in a direction traversing a track formed on a surface of the information carrier; and a tracking controller operable to control the moving means to scan the track with the light beam, wherein the tracking controller includes: a deviation detector operable to generate a detection signal corresponding to a positional relationship between the light beam on the information carrier and the track; a tracking driving means operable to generate a driving signal for driving the moving means based on the detection signal; an integrator operable to integrate an absolute value of a signal corresponding to the driving signal over a predetermined time period, and an abnormal state detector operable to detect an abnormal state of the moving means based on an output of the integrator, the abnormal state being caused by a disturbance due to a higher degree component of waver of the optical disk.