| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase change type optical disk with less reproduction deterioration and having a high C/N. <P>SOLUTION: The phase change type optical information recording medium 10 provided with at least a reflection layer 2, a first protective layer 3, a phase change recording layer 4, a second protective layer 5, and a transparent layer on a substrate on which guide grooves or pits are formed, is characterized in that an optical attenuation layer 6 the transmissivity with respect to an emitted light of which is selected to be 95% to 50% is provided between the second protective layer 5 and the transparent layer 9. <P>COPYRIGHT: (C)2003,JPO |
