Patent ID: 7773484
Filing Date: 2010-08-10
Classification: G11B

Abstract:
1. An optical disc drive having the ability to read data from an optical disc that has a plurality of storage layers including a first storage layer and a second storage layer, the drive comprising: a drive mechanism for rotating the optical disc; an optical pickup, which irradiates the optical disc, loaded in the drive mechanism, with converged light and generates a read signal based on the light that has been reflected from the optical disc; and a control section for controlling operations of the drive mechanism and the optical pickup, thereby shifting the focal point of the light, wherein in reading continuously data that is stored over the first and second storage layers, the control section shifts the focal point of the light in a first radial direction while data is being read from the first storage layer and then moves the focal point of the light to a location on the second storage layer before data starts to be read from the second storage layer, the location on the second storage layer having been shifted from its previous location by a predetermined displacement in a second radial direction that is opposite to the first radial direction.