| 摘要 |
PURPOSE:To obtain a normal and correct tracking error signal at the time of executing tracking servo by a push-pull method by using an optical recording disk in which a dyestuff layer is formed as a light absorbing layer on a base board, and a reflecting layer is laminated in it. CONSTITUTION:Unevenness corresponding to a groove 31 is given to the surface of the dyestuff layer 3, and when the film thickness of the dyestuff layer of a groove 31 part, the film thickness of the dyestuff layer of a land part 35, and the depth of the groove 31 are made DG, DL, and dG respectively, D=DL +dG-DG is made a value larger than DO at which the tracking error signal is '0'. At this time, dG is made 1300A<dG<=2500A, and the width WG of the groove 31 is made 0.35 to 0.6mum, and the pitch P of the groove 31 is made 1.5 to 1.7mum. |
