Patent ID: 7983120
Filing Date: 2011-07-19
Classification: G11B

Abstract:
1. An optical disk apparatus recording and reproducing data onto and from an optical disk with at least three recording layers and non-uniform interlayer distances between respective recording layers, the apparatus comprising: a disk motor which rotates the optical disk; a pickup which condenses a laser beam onto an objective lens and irradiates the laser beam onto a desired recording surface of the optical disk for data recording/reproduction; a signal processing circuit which processes the recorded/reproduced data and, at the same time, generates a focus error signal from a signal detected by the pickup; a control unit which drives an actuator based on the focus error signal and thereby, controls a focus position of the objective lens; and a memory which stores interlayer distances and driving voltages corresponding to all of the combination of jump patterns of at least three recording layers within the optical disk in advance, wherein, the optical disk has a distance between one recording layer and another recording layer being different from the distance between the another recording layer and a further layer; and wherein, when a layer jump is carried out from the one recording layer to the further recording layer of the optical disk, with the another recording layer being arranged between the one recording layer and the further recording layer, the control unit reads out the driving voltages from the memory and sets the driving voltages, the driving voltages correspond to the combination of one recording layer and further recording layer; and wherein the driving voltages comprise an acceleration voltage for a start-up process, an intermediate voltage and a brake voltage for a stopping process; and wherein the acceleration voltage, the intermediate voltage and the brake voltage vary respectively depending on the combination pattern of the at least three recording layers.