Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Patent
1995-12-01
1997-09-09
Thurlow, Jeffery R.
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
264 134, 264108, 2642896, 359498, 428910, B29C 5504, G02B 100
Patent
active
056662238
ABSTRACT:
This invention relates to a new and improved light-polarizing sheet comprising molecularly oriented polyvinyl alcohol containing an oriented block segments of polyvinylene and said polyvinyl alcohol. In particular, the polarizing sheet comprises a polyvinylalcohol/polyvinylene block copolymer material wherein the polyvinylene blocks thereof are formed by molecular dehydration of a sheet of polyvinylalcohol; said sheet of polyvinylalcohol/polyvinylene block copolymer material comprising a uniform distribution of light-polarizing molecules of polyvinylalcohol/polyvinylene block copolymer material varying in the length, n, of the conjugated repeating vinylene unit of the polyvinylene block of the copolymer throughout the range of from 2 to 24; the concentration of each of said polyvinylene blocks, as determined by the absorption of wavelengths ranging from 200 to 700 nm remaining relatively constant, the degree of orientation of said light-polarizing molecules, as measured by the spectral dichroic ratio, R.sub.D, of said blocks, increasing throughout said range with increasing length, n, of said polyvinylene blocks; said polyvinylene block concentration and said degree of orientation of said molecules imparting to said sheet a photopic dichroic ratio, R.sub.D, of at least approximately 45.
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Bennett Stewart
Cael John J.
Kadaba Narendra S.
Trapani Giorgio B.
de Luna Renato M.
Polaroid Corporation
Thurlow Jeffery R.
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