Patent ID: 6377523
Filing Date: 2002-04-23
Classification: G11B

Abstract:
A seek control method of seeking a light beam of an optical head from a certain track on an optical storage medium to a desired track, the method comprising the steps of:calculating a target position; detecting a present position from a track error signal indicating a relative position between the light beam and the track; calculating a feedback control quantity from an error between said target position and said present position; and controlling moving means for moving the light beam in accordance with said feedback control quantity, wherein said detecting step including the steps of: counting track zero-cross signals acquired by slicing said track error signal at a certain level; measuring a first interval of edges of said track zero-cross signals; measuring a second interval from said edge of the track zero-cross signal just before a certain sampling time to said sampling time; dividing said second interval by said first interval; and calculating said present position from a count value of said track zero-cross signals and a divided result of said second and first intervals.