Enhancing optical density

The optical focusing system (100) restrained is a data simple table (296), wherein the data simple table (296) is provided by the configuration for operating the driving unit (200) signal (293). The pixel (293) of the data table (296) signal to the optical system (209) is generated in the disc (217) label area (221) is. According to the data simple table (296); a through (200) exerted the signal (293) to synchronize the optical system (209) focused while disc (217) label area (221) is (221) is printed on the disc (217) label area to the driving unit the image (165).