| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk in which the contents of recorded information can be known simply without driving the optical disk so as to be reproduced. SOLUTION: An electronic circuit 20 wherein at least an electric-power generation means 21 or an electric-power transmission means, a power-supply circuit 22, a memory 24 in which additional information is stored, a display means 26 and a control means 23 are contained is installed in a space part excluding a main information recording region in the substrate of an optical disk. The additional information which is stored in the memory 24 is read out by the control means 23, and display information which corresponds to the additional information is displayed on the display means 26. |
