Method of coating a transparent substrate
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United States of America Patent
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-
Feb 5, 1985
Grant Date -
N/A
app pub date -
Mar 22, 1984
filing date -
Mar 25, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Optical filters, e.g. for reflecting infrared radiation while passing visible light radiation is made by applying to the silver reflective coating a protective coating of a metal oxide by magnetron cathode sputtering and only thereafter is the dereflective layer applied by magnetron cathode sputtering. The protective coating-oxygen partial pressure and coating rate are substantially less than the dereflective coating-oxygen partial pressure and coating rate. Apparently the protective coating prevents damage to the reflective coating.
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