Clear to circular polarizing photochromic devices
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United States of America Patent
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Dec 13, 2011
Grant Date -
Apr 7, 2011
app pub date -
Sep 1, 2010
filing date -
Jul 1, 2003
priority date (Note) -
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Abstract
The present invention provides composite optical elements including a photochromic linear polarizing element and a birefringent layer such that composite optical element circularly or elliptically polarizes transmitted radiation. The photochromic linear polarizing element is formed from (i) an at least partially ordered polymeric sheet; and (ii) a reversible photochromic-dichroic material that is at least partially aligned with the polymeric sheet and has an average absorption ratio of at least 1.5 in the activated state. The birefringent layer includes a polymeric coating or a polymeric sheet connected to the photochromic linear polarizing element.
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