Patent ID: 6327240
Filing Date: 2001-12-04
Classification: G11B

Abstract:
An optical disc drive for playing an optical disc having formed concentrically or spirally thereon lands and grooves forming together a data recording track and in which an address information is recorded on only one of the two walls forming a groove by wobbling and which has address areas discretely disposed and data area disposed, not wobbled, between two walls of the groove, comprising:a recording/reproducing means for reproducing an address information from the optical disc and recording or reproducing data based on the address information;a tilt correcting means for correcting a relative angle of a laser beam irradiated to the data recording track;the recording/reproducing means detecting a radial push-pull signal indicative of a radial difference in amount of light of a laser beam from an optical disc having tilt pattern areas discretely disposed and different in track pitch from other areas on the data recording track; andthe tilt correcting means for correcting, based on the radial push-pull signal, the relative angle of the laser beam irradiated to the data recording track.