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US 8,852,706 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
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Abstract
A silver-based magnesium alloy thin film is provided for the semi-reflective coating layer of optical discs. This alloy has moderate to high reflectivity and reasonable corrosion resistance in the ambient environment.
Claims9
An optical storage medium, comprising:
- a. a first layer having a pattern of pits and lands in at least one major surface;
- b. a reflective layer conforming to the pits and lands of the first layer;
- c. a second layer having a pattern of pits and lands in at least one major surface;
- and
- d. a semi-reflective layer, including a metal alloy comprising silver, magnesium, and copper, conforming to the pits and lands of the second layer;
- e. wherein the amount of copper that is present ranges from about 0.01 a/o percent to about 10.0 a/o percent.
3 more elements
Apparatus for making an optical storage medium, the apparatus comprising, in combination:
- a. a first layer having a pattern of pits and lands in at least one major surface;
- b. means for sputtering a reflective layer onto the pits and lands of the first layer;
- c. a second layer having a pattern of pits and lands in at least one major surface;
- d. a target comprising a metal alloy;
- and
- e. means for sputtering a semi-reflective layer from the target onto the pits and lands of the second layer;
- f. wherein the metal alloy comprises silver, magnesium, and copper;
- and
- g. wherein the amount of copper that is present ranges from about 0.01 a/o percent to about 10.0 a/o percent.
6 more elements
Dependencies are inferred from the claim text.