| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium by which eccentric center of gravity in reproduction is reduced by preventing overflow of a part of a cover layer in a center hole of a substrate. <P>SOLUTION: The optical information recording medium is constituted by providing a recording layer and the cover layer in which the inner diameter is larger than that of the substrate on the substrate in this order, performs recording and reproduction by irradiation of laser light from the side of the cover layer and in which the substrate has a projected part to be used for positioning an interior edge of the cover layer. <P>COPYRIGHT: (C)2004,JPO |
