| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-layer phase-change type information recording medium excellent in overwrite characteristics and rewritable at high-density particularly even by using a blue-violet laser beam. <P>SOLUTION: The two-layer phase-change information recording medium comprises a first substrate, a second substrate, and between the first and second substrates, at least a first information layer, an intermediate layer, and a second information layer in order of mention. Information is at least either recorded or reproduced by projecting a laser beam from the first substrate side. The first information layer has at least a first heat-diffusion layer, a first protective layer, a first recording layer, a second protective layer, a first reflective layer, and a second heat-diffusion layer in order of mention. The thicknesses of the first and the second protective layers are ≤35 nm, and the thicknesses of the first and second heat-diffusion layers are ≥10 nm. The thickness d1 (nm) of the first protective layer and the thickness d2 (nm) of the second protective layer satisfy the relation d1≤d2+5 nm. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
