Optical disc drive apparatus, camera apparatus, and method for controlling tilt of light beam in accordance with skew in optical disc

A camera apparatus comprising:

• a shooting section;
• a rotatably supporting drive unit configured to apply a rotatably driving force to an optical disc rotatably supported thereby;
• an optical head including an optical pickup configured to apply a light beam to the optical disc that is rotating and a tilt drive section capable of changing the tilt of the light beam;
• 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;
• and
• 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,
• wherein the tilt drive section corrects, in accordance with the estimated skew value, a shift in a position on the optical disc where the light beam is applied, the shift occurring because of the angular velocity.

A method for controlling the tilt of a light beam in accordance with skew in an optical disc, the method comprising the steps of:

• applying a rotatably driving force to the optical disc that is supported in a rotatable state while applying the light beam from an optical pickup to the optical disc that is rotating;
• detecting 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;
• estimating a skew value in the optical disc in accordance with a result of detecting the angular velocity;
• and
• changing the tilt of the light beam in accordance with the skew value that is estimated and correcting a shift in a position on the optical disc where the light beam is applied, the shift occurring because of the angular velocity,
• wherein the skew value is estimated such that one 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 skew value in a case where the angular velocity is applied in the same magnitude as that of the one skew value but in another direction, opposite to the one direction, in which the optical disc approaches the optical pickup.