| 摘要 |
PURPOSE:To curtail an injection molding cycle to enhance productivity by forming the shape of section in the width direction of a recording pit like a wedge and thereby realizing easy peeling of resin substrate, after injection molding, from a metal stamper. CONSTITUTION:A polycarbonate substrate 1 is covered with aluminum, as an Al reflection film 2, by the high frequency magnetron sputtering method, vacuum evaporation method, etc., and the film 2 is then covered with a protection film 3 of UV setting resin. In the case where the substrate 1 is injection-molded, the shape of section in the width direction of the recording pit is set like a wedge so that the substrate 1 can be peeled easily from the metal stamper after the injection molding. Productivity may be determined by the injection molding cycle and the injection molding cycle can be curtailed to about 1/2, when the bottom surface of storing bit has the shape like a wedge, in comparison with the case where the bottom surface of storing bit is flat. Thereby, productivity can be improved. |
