Multilayer interference filter for photochromic lenses
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United States of America Patent
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Dec 15, 2009
Grant Date -
Dec 2, 2004
app pub date -
Mar 26, 2004
filing date -
Mar 26, 2003
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Abstract
A multi-layer thin film is provided preferably for use with photochromic lenses, wherein the thin film comprises a plurality of layers, preferably including dielectric layers, selected and arranged so as to reflect less than about 6 percent of the UVA rays in a range of about 315 to 400 nm, more preferably about 350 to 380 nm. The thin film preferably has an activation value greater than 25%.
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