| 摘要 |
<P>PROBLEM TO BE SOLVED: To display drawings and characters and to record data, also at a center part of an optical disk medium. <P>SOLUTION: A center hole of the optical disk medium 1 is eliminated, a drawing/printed picture/character layer 6 for drawings and characters is formed in an occupation area including the center part from the outer periphery of the optical disk medium, and a data recording layer 7 is formed in the wide range from the outer periphery of the optical disk to 0.5 mm radius from the center of the disk. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
