Optical interference filters, and filament tubes and lamps provided therewith
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United States of America Patent
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Aug 25, 2015
Grant Date -
Feb 26, 2015
app pub date -
Aug 21, 2013
filing date -
Aug 21, 2013
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Abstract
A multilayer coating systems suitable for use as optical interference filters in lighting systems, for example, halogen lamps. Such an optical interference filter contains alternating layers of a high refractive index material and a low refractive index material. The high refractive index material consists of niobia, titania, and incidental impurities and contains either about 25 to less than 50 mol % titania and the balance niobia and incidental impurities, or contains about 60 to about 80 mol % titania and the balance niobia and incidental impurities.
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