| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical recording medium having information to be visibly identified in addition to information contained in a ROM area of the medium. <P>SOLUTION: The optical disk-like recording medium in which recorded information is present beforehand is characterized in that optional information visibly identified by a change in reflectance accompanying a change in the product (W×L) of a bit width W and a pit length L is formed. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
