REWRITABLE OPTICAL RECORD CARRIER

摘要

A rewritable optical record carrier comprising a first substrate carrying a first recording stack of layers, which recording stack comprises, a first dielectric layer, a recording layer comprising a phase-change recording material, a second dielectric layer, and a metal mirror layer. In order to achieve a maximum difference between the reflection of the crystalline regions and the amorphous region, said first dielectric layer has a thickness d1 in the range of 20 nm to 50 nm, and said second dielectric layer has a thickness d2 according to the relation 0.0225*d2<2> - 2.6572*d2 + 173.3(nm) < D1 < 0.0225*D2<2> - 2.6572*d2 + 213.3(nm) when the mirror layer comprises aluminum, or a thickness d2 according to the relation 0.0191*d2<2> - 2.0482*d2 + 149.6 (nm) < D1 < 0.0191*D2<2> - 2.0482*d2 + 189.6(nm) when the mirror layer comprises silver.