| 摘要 |
PROBLEM TO BE SOLVED: To produce an optical disk having appearance of various colors at a low cost. SOLUTION: Since substrates 22, 23 are stuck to each other with a colored adhesive layer 27, even if the molding material of the substrates 22, 23 is not colored, the resulting optical disk 21 looks colored. Since it is not necessary to color the molding material of the substrates 22, 23 by adding a colorant, a colorant used is not required to have heat resistance and is selected from a wide range. When only the adhesive layer 27 is removed form the optical disk 21, the molding material of the substrates 22, 23 is easily reutilized as a colorless molding material. |
