Patent ID: 7385907

Claim:
A rewritable optical record carrier comprising a substrate carrying a first recording stack of layers, which first recording stack comprises, in this order or in reverse order, a first dielectric layer, a recording layer comprising a phase-change recording material, a second dielectric layer, and a mirror layer, composed of a mixture comprising aluminum as a main component or composed of a mixture comprising silver as a main component, characterized in that said first dielectric layer has a thickness d 1 in the range of 100 nm to 200 nm, and said second dielectric layer has a thickness d 2 according to one of the following relations a) when the mirror layer comprises aluminum 0.0225 *d 2 2 −2.6572 *d 2 +173.3 (nm)< d 1 <0.0225 *d 2 2 −2.6572 *d 2 +213.3 (nm) b) when the mirror layer comprises silver 0.0191 *d 2 2 −2.0482 *d 2 +149.6 (nm)< d 1 <0.0191* d 2 2 −2.0482* d 2 +189.6 (nm).