| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cross-interlacing at the time of rewriting by eliminating the conduction of the heat generated by a land recording layer or groove recording layer to an adjacent land recording layer or groove recording layer by separating a recording layer into land recording layers provided on a land and groove recording layers provided on a groove part. SOLUTION: The side walls of the land part R are formed into reverse tapered walls 10 (so that the interval between both side walls become gradually narrow to the lower part) or vertical walls 20 (so that the interval between both the side walls is constant in width from the upper end to the lower end), thereby a recording layer separation part is provided. A groove recording layer 3a is filmed on the groove part G by a collimation sputtering method or long sputtering method and a land recording layer 3b is filmed on the land part R. Consequently, the recording layer is not filmed on the reverse tapered walls 10 at all and the recording layer filmed on the vertical walls 20 becomes discontinuous, so that the groove recording layer 3a and land recording layer 3b can be separated. |
