Patent ID: 7924671
Filing Date: 2011-04-12
Classification: G11B

Abstract:
1. An optical disc drive apparatus comprising: a rotatably supporting drive unit configured to apply a rotatably driving force to an optical disc rotatably supported thereby; an optical pickup configured to apply a light beam to the optical disc that is rotating; an angular velocity sensor configured to detect the magnitude and direction of an angular velocity acting about an axis lying in a radial direction of the optical disc in which the optical pickup is movably disposed, the angular velocity occurring because of an external force and being applied to the optical disc that is rotating; a skew estimating section configured to estimate skew in the optical disc in accordance with a result of detection by the angular velocity sensor, such that one estimated skew value in a case where the angular velocity is applied in one direction in which the optical disc moves away from the optical pickup is made to differ from another estimated skew value in a case where the angular velocity is applied in the same magnitude as that of the one estimated skew value but in another direction, opposite to the one direction, in which the optical disc approaches the optical pickup; and a tilt drive section configured to change the tilt of the light beam in accordance with the estimated skew value and to correct a shift in a position on the optical disc where the light beam is applied, the shift occurring because of the angular velocity.