| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deviation of the printing positions of colors from each other during the printing of plural colors on a label surface by providing a position indication label for reflecting received light and specifying the reference position in a rotational direction in a signal recording area or in the vicinity thereof, and positioning based on the position indication label. SOLUTION: On one surface of an optical disk D, a signal recording area 57 formed in a predetermined pit shape is provided. Inside the signal recording area 57, an information indicating area 58 is provided to have a gap in a radial direction and, in the proper position of the information indication area 58, a bar code 60 is provided to serve as a position indication label for reflecting received light and specifying the reference position in a rotational direction. The precise position of the optical disk D is detected by the bar code 60 and, by precisely positioning the optical disk D based on the detected position information, and when the printing of plural colors on a label surface, beautiful multicolor printing is realized by preventing the deviation of the printing of colors from each other. |
