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US 6,007,889 AGranted
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 copper-based or silver-based alloy thin film is provided for the highly reflective or semi-reflective layer of optical discs. Alloy additions to silver include gold, palladium, copper, rhodium, ruthenium, osmium, iridium, and platinum. Alloy additions to copper include silver, cadmium, gold, magnesium, aluminum, and nickel. These alloys have moderate to high reflectivity and reasonable corrosion resistance in the ambient environment.
Claims30
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including silver and gold wherein the relationship between the amounts of silver and gold is defined by Ag.sub.x Au.sub.y where 0.9<x<0.999 and 0.001.ltoreq.y.ltoreq.0.10.
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including silver and palladium wherein the relationship between the amounts of silver and palladium is defined by Ag.sub.x Pd.sub.t where 0.85<x<0.999 and 0.001<t<0.15.
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including silver, gold, and palladium wherein the relationship between the amounts of silver, gold, and palladium is defined by Ag.sub.x Au.sub.y Pd.sub.t where 0.75<x<0.998, 0.001 <y <0.10, and 0.001 <t <0.15.
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including copper and silver wherein the relationship between the amounts of copper and silver is defined by Cu.sub.m Ag.sub.n where 0.95<m<0.9999 and 0.0001<n<0.05, and wherein said metal alloy includes the metals cadmium, magnesium, aluminum, and nickel, and where the amount of silver, cadmium, magnesium, aluminum, and nickel is no more than 6 atomic percent, and where the amount of copper is no less than 94 atomic percent.
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including copper and cadmium wherein the relationship between the amounts of copper and cadmium is defined by Cu.sub.m Cd.sub.o where 0.85<m<0.9999 and 0.0001<o<0.15.
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including copper and gold wherein the relationship between the amounts of copper and gold is defined by Cu.sub.m Au.sub.p where 0.7<m<0.9999 and 0.0001<p<0.30.
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including copper and magnesium wherein the relationship between the amounts of copper and magnesium is defined by Cu.sub.m Mg.sub.q where 0.9<m<0.9999 and 0.0001<q<0.10.
An optical storage medium, comprising:
- a first substrate having a pattern of features in at least one major surface;
- and
- a first reflective layer adjacent the feature pattern, the reflective layer including a metal alloy, said metal alloy including copper and nickel wherein the relationship between the amounts of copper and nickel is defined by Cu.sub.m Ni.sub.s where 0.87<m<0.9999 and 0.0001<s<0.13.
Dependencies are inferred from the claim text.