SILVER BASED REFLECTOR WITH HYBRID PROTECTION LAYERS
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United States of America Patent
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Apr 14, 2016
app pub date -
Oct 9, 2014
filing date -
Oct 9, 2014
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Abstract
A silver-based reflector includes a hybrid protection layer that includes a thin Aluminum (Al) protection layer thermally deposited onto a Silver (Ag) reflective layer, which prevents yellowing or tarnishing of the Ag reflective layer. In an embodiment, a lamp reflector is formed by providing a substrate material in the shape of a reflector, thermally depositing an Ag reflective layer onto the an interior surface of the reflector having a sufficient thickness to reflect light, and thermally depositing an Al protective layer onto the Ag reflective layer to protect the Ag reflective layer from oxidation and sulfide formation. The Al protective layer has a thickness within the range of about 30 angstroms (Å) to about 100 Å.
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