Patent ID: 6751171
Filing Date: 2004-06-15
Classification: G11B

Abstract:
A data recording/reproducing apparatus for an optical disc, said optical disc comprising a recording track carrying a guide groove for causing an illuminated laser spot to follow a center position of said recording track, said guide groove being meanderingly formed according to wobbling signals of a pre-set frequency, said apparatus comprising:a) push-pull signal detection means for detecting push-pull signals containing: 1) tracking error signals representing error components from said track center; and 2) said wobbling signals according to which said guide groove is meanderingly formed; b) wobbling signal detection means for detecting said wobbling signals from said push-pull signals detected by said push-pull signal detection means; and c) control means for controlling a loop gain of at least a tracking servo according to a level of said detected wobbling signals, wherein the loop gain is adjusted in real time without interrupting the tracking servo.