Patent ID: 6396779
Filing Date: 2002-05-28
Classification: G11B

Abstract:
An optical disk apparatus for irradiating a track on an information carrier on which information is recorded with a light beam so as to reproduce information from the track, the optical disk comprising:a tracking error detector for detecting a tracking error signal representing a displacement between the light beam and the track; a fine movement section for moving the light beam in a substantially radial direction of the information carrier; a coarse movement section for moving the fine movement section in the substantially radial direction of the information carrier; a tracking controller for controlling the fine movement section and the coarse movement section based on the tracking error signal detected by the tracking error detector so that the light beam is positioned along the track; and an eccentricity detector for detecting an amount of eccentricity of the track on the information carrier, wherein the coarse movement section is activated when a signal level from the tracking controller becomes greater than that which is only influenced by the eccentricity detected by the eccentricity detector.