| 摘要 |
PURPOSE:To prevent the multiple transfer of signal marks of defective pits with the optical disk of low density of the signal masks or the optical disk of a small size and thin type by forming the signal marks to projecting shape. CONSTITUTION:The optical disk 1 is formed by using a veneer plastic replica substrate 2 or sticking these substrates to each other. The signal marks 4 for tracking or reading out of information are formed in an information region 3 for recording data, etc., the substrate 2. The density of the marks 4 is <=10<5> pieces/mm<2>. The signal marks 4 in the information region 3 of the replica substrate 2 are formed to the projecting shape. A recording layer 17 is formed on the substrate 2 and the recording and reproducing of the information signals are executed. The intrusion of the resin into the recessed pits of a stamper is obviated by forming the marks 4 in such a manner, as the viscosity of the resin on the substrate 2 surface is high even if the substrate 2 parts from the stamper and is again pressed thereto at the time of injection molding. |
