| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration in a recording characteristic and to improve signal contrast at a reproducing time with an optical interference effect by successively laminating first, second dielectric layers, a recording layer, a third dielectric layer and a reflection layer, arranging the mixture layer of both layer materials between the first, second dielectric layers and making the third dielectric layer thickness a specified range. SOLUTION: The mixture layer of both layer materials is arranged between first and second dielectric layers, peeling between the both layers is prevented and long term storage stability and an excellent rewrite repeat property are obtained. Further, the first dielectric layer thickness is made thinner than the second dielectric layer thickness for displaying the optical characteristic of the second dielectric layer. Further, the third dielectric layer thickness is made to 3-50 nm and crack occurrence and deterioration in repeat durability due to the thinning is prevented, further, the cooling degree lowering of a recording layer due to the thickness in the range or above is prevented and an excellent erase characteristic and repeat durability, particularly excellent recording/erasing characteristics when a mark length is recorded are obtained. |
