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US 7,645,500 B2Granted
Metal alloys for the reflective or the semi-reflective layer of an optical storage medium
AssigneeTarget Technology Company, LLC
InventorHan H. Nee
Life of this patent
Estimating the term…
Abstract
A silver-based alloy thin film is provided for the highly reflective or semi-reflective coating layer of optical discs. Elements that can be added to silver to produce useful silver alloys include zinc, aluminum, copper, manganese, germanium, yttrium, bismuth, scandium, and cobalt. These alloys have moderate to high reflectivity and reasonable corrosion resistance in the ambient environment.
Claims33
An optical storage medium, comprising:
- a first layer formed of a transparent resin and having a pattern of features in at least one major surface;
- and a first reflective layer adjacent said feature pattern, said first reflective layer including a metal alloy, said metal alloy including silver, copper, and magnesium, wherein the relationship between the amounts of silver, copper, and magnesium in the metal alloy is defined by AgxCuzMgw where 0.85<x<0.9998, 0.0001<z<0.01, and 0.0001<w<0.05.
An optical storage medium, comprising:
- a first layer formed of a transparent resin and having a pattern of features in at least one major surface;
- and a first reflective layer adjacent said feature pattern, said first reflective layer including a metal alloy, said metal alloy including silver, zinc, and magnesium, wherein the relationship between the amounts of silver, zinc, and magnesium in the metal alloy is defined by AgxZnyMgw where 0.8000<x<0.9998, 0.0001<y<0.15, and 0.0001<w<0.05.
An optical storage medium, comprising:
- a first layer formed of a transparent resin and having a pattern of features in at least one major surface;
- and a first reflective layer adjacent said feature pattern, said first reflective layer including a metal alloy, said metal alloy including silver, zinc, and cobalt, wherein the relationship between the amounts of silver, zinc, and cobalt in the metal alloy is defined by AgxZnyCow where 0.8000<x<0.9998, 0.0001<y<0.15, and 0.0001<w<0.05.
Dependencies are inferred from the claim text.