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US 5,965,229 AGranted
Optical recording medium
AssigneeU.S. Philips Corporation
InventorsGuo-Fu Zhou, Bernardus A. J. Jacobs
Life of this patent
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Abstract
An optical recording medium has a phase-change recording layer embedded in a stack of thin layers arranged on a substrate. At least one of the dielectric layers adjacent to the recording layer comprises a carbide. The carbide layer is separated from the substrate and/or from a reflecting layer in the stack by a dielectric layer not containing a carbide. The thickness of the carbide layer either lies in a range from 2 to 8 nm or is substantially equal to the thickness of the adjacent dielectric layer.
Claims16
An optical recording medium, comprising:
- a substrate;
- and
- a stack of thin layers provided on the substrate, including:
- a first dielectric layer;
- a second dielectric layer;
- a recording layer for changing between two crystallographic states and between the dielectric layers;
- a third dielectric layer between the recording layer and the first dielectric layer, of a different material than the first dielectric layer and including a carbide;
- and
- a reflective layer.
6 more elements
A method for high speed recording, comprising:
- providing a substrate;
- and
- providing a stack of thin layers on the substrate, including::
- a first dielectric layer;
- a second dielectric layer;
- a recording layer for changing between two crystallographic states and between the dielectric layers;
- a third dielectric layer between the recording layer and the first dielectric layer, of a different material than the first dielectric layer and including a carbide;
- a reflective layer;
- in which the medium is scanned by scanning the recording layer with a radiation beam at a velocity with respect to the recording layer of at least 2.4 m/s.
6 more elements
Dependencies are inferred from the claim text.