| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium which has high adhesion properties between respective layers and has stable recording and reproducing characteristics. <P>SOLUTION: The optical information recording medium 10 like a disk has a central hole 24, has a recording layer 16, tacky adhesive layer 20, and cover sheet 22 in this order on a substrate, has a track pitch of 300 to 600 nm and a groove depth of 40 to 150 nm and is recorded and reproduced with information by being irradiated with a laser beam of a wavelength below 500 nm, in which the substrate and the cover sheet are firmly stuck in the regions of at least portions near the inner periphery and/or the outer periphery with tacky adhesive layer and the maximum value of the diametral direction length of the firmly stuck regions is ≥0.4 mm. <P>COPYRIGHT: (C)2003,JPO |
