Multi-stack optical data storage medium and use of such medium

Details Multi-stack optical data storage medium and use of such medium Multi-stack optical data storage medium and use of such medium

2007-01-30

2007-01-30

Hess, Bruce H. (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

C369S013390, C369S013400, C369S013530, C428S064500

Reexamination Certificate

active

10513049

ABSTRACT:
A description is given of a multi-stack optical data storage medium (20) for rewritable recording using a focused radiation beam (30) entering through an entrance face (16) of the medium (20) during recording. The medium (20) has a substrate (1). Deposited on a side thereof is a first recording stack (2) with a phase-change type recording layer (6). The first recording stack (2) is present at a position most remote from the entrance face (16). At least one further recording stack (3), with a phase-change type recording layer (12) is present closer to the entrance face (16) than the first recording stack (2). A metal reflective layer of Cu, transparent for the radiation beam (30), is present in the further recording stack (3) and has a thickness between 2 and 10 nm. A transparent spacer layer (9) is present between the recording stacks (2, 3). In such a way a metal reflective layer (14) with a high optical transmission combined with sufficient heat sink action is achieved which furthermore has a low chemical reactivity with adjacent layers.

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