Optical device with a dichroic polarizer and a multilayer optica

Details Optical device with a dichroic polarizer and a multilayer optica Optical device with a dichroic polarizer and a multilayer optica

1998-01-13

2000-08-29

Schuberg, Darren E.

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

359490, 359500, G02B 530

Patent

active

061116971

ABSTRACT:
An optical device includes a dichroic polarizer and a multilayer optical film, such as a reflective polarizer or mirror. The multilayer optical film is made using polymers which may allow for the simultaneous orientation of the dichroic and reflective polarizers. The multilayer optical film often contains a set of birefringent first layers and a set of second layers, which may have an isotropic index of refraction. The dichroic polarizers is a polyvinyl alcohol film with a dichroic dye. The multilayer optical film and dichroic polarizer can be stretched at temperatures of 130.degree. C. or less to orient the two films without substantial cracking of the dichroic polarizer. When an optional second polymer is combined with the polyvinyl alcohol, the multilayer optical film and dichroic polarizer can be stretched at temperatures of about 160.degree. C. without substantial cracking of the dichroic polarizer.

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