| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-layered optical information recording medium capable of obtaining a sufficient recording property even at an information layer having a high-light transmittance property disposed at the front side as viewed from the light beam emission side in a wavelength range of ≥453 nm, especially in a red wavelength range (655±5 nm) used in a DVD and recording and reproducing a sufficient data signal from an information layer disposed at the rear side. <P>SOLUTION: In the two-layered optical information recording medium including a first substrate, a first information layer, a second information layer, and a second substrate formed in this order as viewed from the light beam incident side, the first information layer is provided with at least a first lower dielectric layer, a first recording layer, a first upper dielectric layer, a first reflective layer, and an inorganic dielectric layer formed in this order as viewed from the light beam incident side, the second information layer is provided with at least a second lower dielectric layer, a second recording layer, a second upper dielectric layer, and a second reflective layer formed in this order as viewed from the light beam incident side and the first reflective layer contains Cu with a content of 99.8% by mass to 95.0% by mass and one or more metals selected from the group consisting of Ta, Nb, Zr, Ni, Cr, Ge, Au, and Mo and has a thickness of 4 nm to 12 nm. <P>COPYRIGHT: (C)2007,JPO&INPIT |
