Patent ID: 6459664
Filing Date: 2002-10-01
Classification: G11B

Abstract:
Optical disc apparatus comprising:reproduction signal detector that detects information recorded on a disc by directing a light beam onto a disc on which there are arranged a first pit sequence formed in a position offset in one direction orthogonal to a track and a second pit sequence formed in a position offset in the other direction orthogonal to the track; first tracking error detector that detects positional offset of the track and the light beam by a push-pull method; second tracking error detector that detects positional offset of the track and the light beam from the reproduction signals of the first pit sequence and of the second pit sequence output by said reproduction signal detector; moving arrangement which moves the light beam transversely across the track; tracking control that controls said moving arrangement in accordance with the output of said first tracking error detector such that the light beam is positioned on the track; and correction arrangement which changes the target position of said tracking control in accordance with the output of said second tracking error detector.