Diffusely-reflecting polarizer having nearly isotropic...

Optical: systems and elements – Polarization without modulation – Depolarization

Reexamination Certificate

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C359S506000, C264S001310

Reexamination Certificate

active

07852559

ABSTRACT:
The present invention provides a diffusely-reflecting polarizer comprising:a first polymer which is amorphous and having a birefringence of less than about 0.02 and a second polymer, the first polymer being a continuous phase, and the second polymer being a disperse phase whose index of refraction differs from said continuous phase by greater than about 0.05 along a first axis and by less than about 0.05 along a second axis orthogonal to said first axis;wherein the diffuse-reflectivity of said first and second polymers taken together along at least one axis for at least one polarization state of electromagnetic radiation is at least about 50%, the diffuse transmittance of said first and second polymers taken together along at least one axis for at least one polarization state of electromagnetic radiation is at least about 50%.

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International Search Report of Corresponding International Application No. PCT/US2007/012670.
O. A. Aphonin; “Optical Properties of Stretched Polymer Dispersed Liquid Crystal Films: Angle-dependent Polarized Light Scattering”; Liquid Crystals, 1995, vol. 19, No. 4, pp. 469-480.

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