OPTICAL DISC DEVICE AND OPTICAL DISC SEMICONDUCTOR

摘要

It is possible to provide an optical disc device capable of acquiring an accurate gain of focus control. The optical disc device (100) includes; an FE generator (20) for generating an EF signal; an AS generator (21) for generating an AS signal; a normalization calculator (22), an Fc filter (23); a selector (24), a spherical aberration setting device (34); an FE measurement device (30), an Fc draw instructor (52); a drawn AS measurement device (40); and a gain calculator (32). The amplitude of the FE signal is acquired before focus draw and the level of the AS signal is acquired after the focus draw, thereby adjusting the focus gain.