| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an optical information recording medium, which can avoid adverse effects to the reflection film and recording layer of a disk base plate when ripping a dummy disk plate, and easily obtain a disk having a plurality of the recording layers in simple steps suitable to mass production, and that a single molding machine can mold its base plate and dummy base plate while making the dummy base plate recyclable. <P>SOLUTION: This optical information recording medium has a plurality of the recording layers stacked through transparent adhesive layers between the disk base plate and the dummy disk base plate. This disk base plate and the dummy disk base plate are made from aromatic polycarbonate having average viscosity molecular weights of 10,000-30,000. The critical surface tension of this disk base plate is 20 mN/m or larger but, 40 mN/m or less, and the critical surface tension of this dummy disk base plate is 5 mN/m or larger but <20 mN/m. <P>COPYRIGHT: (C)2004,JPO |
