Patent ID: 7368223
Filing Date: 2008-05-06
Classification: G11B,Y10S,Y10T

Abstract:
1. A multi-stack optical data storage medium for rewritable recording by means of a focused laser-light beam, said medium having a substrate with deposited on a side thereof: a first recording stack comprising a phase-change type recording layer, said first recording stack being present most remote for the focused laser-light beam, at least one further recording stack comprising a phase-change type recording layer, a transparent spacer layer adjacent each further recording stack at a side closest to the first recording stack, said transparent spacer layer having a thickness larger than the depth of focus of the focused laser-light beam, wherein at least one indium tin oxide layer is present between the phase-change type recording layer of the first recording stack and the phase-change type recording layer of the at least one further recording stack closest to the first recording stack, and wherein an additional indium tin oxide layer is used in place of a reflective layer and is present in the first recording stack at a side most remote from the least one further recording stack.