OPTICAL-DISC DRIVING APPARATUS, OPTICAL-DISC DRIVING METHOD, STORAGE MEDIUM, AND PROGRAM

摘要

AN OPTICAL-DISC DRIVING APPARATUS INCLUDES AN OPTICAL DISC; A PICKUP; A DETECTION UNIT FOR DETECTING A TRAVERSE SIGNAL BY DPP DETECTION FOR EVERY RADIAL TILT ANGLE WITHIN A FIRST RANGE, THE RADIAL TILT ANGLE BEING MEASURED BETWEEN THE OPTICAL DISC AND THE PICKUP; A DETERMINATION UNIT FOR DETERMINING THE RADIAL TILT ANGLE CORRESPONDING TO A TRAVERSE SIGNAL WITHIN A SECOND RANGE INCLUDING A MAXIMUM VALUE AMONG THE DETECTED TRAVERSE SIGNALS; AND A CONTROL UNIT FOR CONTROLLING THE ORIENTATION OF THE PICKUP WITH RESPECT TO THE OPTICAL DISC BASED ON THE DETEMINED RADIAL TILT ANGLE. THE OPTICAL-DISC DRIVING APPARATUS CONTROLS DRIVING OF THE OPTICAL DISC BASED ON THE TRAVERSE SIGNAL BY DPP DETECTION GENERATED FROM A PRECEDING BEAM, A MAIN BEAM, AND A SUCCEEDING BEAM.