Patent ID: 7933175
Filing Date: 2011-04-26
Classification: G11B

Abstract:
1. An optical disc drive, the optical disc drive comprising: a focus actuator for moving an objective lens in a rotation axis direction of a disc; a tracking actuator for moving the objective lens in a radial direction of the disc; aberration correcting means for correcting aberrations; feeding means for moving the pickup in the disc radial direction; wherein a control operation of said aberration correcting means and a control operation of said feeding means are conducted at least partially in parallel; wherein the disc is a multilayer disc; wherein the control operation of said aberration correcting means and the control operation of said feeding means are conducted in parallel, in an operation involving an interlayer movement of the pickup; wherein the control operation of said feeding means is a coarse seek operation which does not depend upon a tracking error signal; and wherein the aberrations at the time of the coarse seek operation are corrected in such way that a value of aberration correction at a target focus jump layer is corrected to a constant value that is preset layer-by-layer.