Coating processes – Optical element produced – Polarizer – windshield – optical fiber – projection screen – or...
Patent
1999-02-16
2000-08-01
Bell, Janyce
Coating processes
Optical element produced
Polarizer, windshield, optical fiber, projection screen, or...
359485, 359490, 359491, 359494, 359508, 427164, 427171, 427172, 427173, B05D 506
Patent
active
060963751
ABSTRACT:
A reflective polarizer and a dichroic polarizer are combined to provide an improved optical polarizer. The dichroic and reflective polarizers are typically in close proximity to each other, and are preferably bonded together to eliminate the air gap between the polarizers. The combination of the two polarizers provides a high reflectivity of one polarization and high transmission for the perpendicular polarization from the reflective polarizer side of the combined polarizer, and high absorption and transmission for light of orthogonal polarization from the dichroic polarizer side. The combination also reduces iridescence as seen in transmission and when viewed in reflection from the dichroic polarizer side. The increased extinction ratio and low reflectivity of the optical polarizer allows use of a lower extinction ratio dichroic polarizer in applications requiring a given extinction ratio and high transmission.
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Jonza James M.
Ouderkirk Andrew J.
Stover Carl A.
Weber Michael F.
3M Innovative Properties Company
Bell Janyce
Miller William D.
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