| 摘要 |
PROBLEM TO BE SOLVED: To provide a phase change type optical disk medium where information of already recorded adjacent tracks is not damaged regardless of execution of land/ groove recording and the cross erase characteristic is excellent by using a substrate having a narrow track pitch and to provide a method for manufacturing the phase change type optical disk medium. SOLUTION: Recording layers 3 laminated at a land part (recessed part) and a groove part (projecting part) adjacent to each other on a substrate 1 made of quartz are discontinuously formed. For the purpose of that, a lower dielectric material layer 2, the recording layer 3, an upper dielectric material layer 4, a reflection film layer 5 and a protective dielectric material layer 6 are successively formed on the substrate 1 having a flat surface. Moreover, a photoresist pattern having T-shaped sectional plane is formed with lower and upper layer resist and ion etching of a thickness equal to the thickness of the laminated body of the lower dielectric material layer 2-the protective dielectric material layer 6 is performed onto the substrate 1. In this state, thin films similar to the lower dielectric material layer 2-the protective dielectric material layer 6 are laminated and the total part of the upper side from the lower resist is removed. |
