SIGNAL PROCESSING DEVICE FOR OPTICAL DISC, INTEGRATED CIRCUIT, OPTICAL DISC DEVICE, AND OPTIMUM RECORDING FOCUS POSITION DETECTING METHOD

摘要

An optical disc signal processing device includes a focus position determining section, wherein when test recording is performed while changing a focus position through a plurality of positions, the focus position determining section obtains an optimum recording focus position based on recording qualities of regions on the optical disc where the test recording has been performed. The focus position determining section includes: a recording state measuring section for measuring, for each focus position, a recording quality of a region on the optical disc where the test recording has been performed; and a determination section for determining, according to a predetermined criterion, whether laser power during the test recording is suitable for obtaining the optimum recording focus position, based on the recording quality obtained for each focus position by the recording state measuring section. When it is determined by the determination section that the laser power during the test recording is not suitable for obtaining the optimum recording focus position, the optical disc signal processing device controls the optical pickup so that the test recording is performed again with the laser power changed.