Protective layers for optical coatings
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United States of America Patent
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Issued Date -
Nov 24, 2005
app pub date -
Mar 26, 2004
filing date -
Jan 25, 2002
priority date (Note) -
Abandoned
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Abstract
An optical coating on a transparent substrate is provided with a temporary layer of carbon as protection during manufacturing against scratches and corrosive environments. When the optical coating and/or substrate are tempered in an atmosphere reactive to carbon, such as air, the layer of carbon is removed as a carbon-containing gas. For an optical coating with a brittle, glassy, outermost layer furthest from the substrate, additional protection is provided by a scratch propagation blocker layer between the outermost layer and the carbon protective layer.
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