Recordable optical device including a barrier layer
AssigneeEastman Kodak Company
InventorsKee-Chuan Pan, Yuan-Sheng Tyan, Guiseppe Farruggia, Donald R. Preuss
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Abstract
For an optical recordable disk, a heat conductive gold layer can be deposited on a phase-change recordable layer to increase the writing threshold. This higher threshold improves the data stability during readout. However, it has been found that there is substantial inter-diffusion between the phase-change layer and the gold layer. The performance is degraded as a result. A barrier layer between the phase-change layer and the gold layer can effectively prevent diffusion and mixing. Using his barrier, the performance is preserved and the data stability is improved.
Claims8
An optical recordable device comprising:
- a) a transparent substrate;
- b) a phase-change recordable layer consisting essentially of a phase-change material which is adapted to change phase and record data in response to laser heating and being disposed over the substrate;
- c) a barrier layer disposed on the phase-change layer the barrier laver being provided using an oxide of the phase-change material;
- and
- d) a heat conductive metal or alloy layer disposed on the barrier layer and selected to conduct heat during writing and reading of data;
- the barrier layer being selected to prevent interaction between the heat conductive layer and the phase-change recordable layer.
Dependencies are inferred from the claim text.