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 R*M said first dielectric layer has a thickness d 1 in the range of 20 nm to 50 nm, and said second dielectric layer has a thickness d 2 according to the relation 0.0225*d₂²-2.6572*d₂+173.3 (nm)1<0.0225*D₂²-2.6572*d₂+213.3 (nm) when the mirror layer comprises aluminum, or a thickness d₂ according to the relationship 0.0191*d₂²-2.0482*d₂+149.6 (nm)1<0.0191*D₂²-2.0482*d₂+189.6 (nm) when the mirror layer comprises silver.