Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Patent
1998-01-13
2000-12-05
Schuberg, Darren
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
359497, 359530, 359589, G02B 530
Patent
active
061574864
ABSTRACT:
Various combinations of retroreflective sheeting and multilayer polymeric reflective films are disclosed. The reflective film includes alternating layers of at least a first and second polymer, the alternating layers being configured to exhibit a high reflectance for light within a first spectral range and a low reflectance for light within a second spectral range. At least two of the alternating layers can have out-of-plane indices of refraction which differ by no more than 50% of the maximum in-plane refractive index difference. The polymeric layers can define optical repeating units arranged in a sequence to have a specific thickness profile designed to give sharpened spectral transitions. The retroreflective layer preferably exhibits retroreflectance in all planes of incidence, but alternately it can be retroreflective in at least one plane of incidence but not in at least one other plane of incidence.
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Benson, Jr. Olester
Fellows Benjamin T.
Garland Wilson C.
Ouderkirk Andrew J.
Weber Michael F.
3M Innovative Properties Company
Jensen Stephen C.
Schuberg Darren
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