Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector
Patent
1992-05-27
1993-08-03
Ryan, Patrick J.
Optical: systems and elements
Having significant infrared or ultraviolet property
Multilayer filter or multilayer reflector
359589, 359588, 428 30, G02B 528
Patent
active
052334651
ABSTRACT:
A polymeric multilayered film which reflects wavelengths of light in the infrared region of the spectrum while being substantially transparent to wavelengths of light in the visible spectrum without the effects of visibly perceived iridescent color is provided. The polymeric multilayered infrared reflecting film comprises at least two diverse, substantially transparent polymeric materials, with the layers having an optical thickness of between 0.09 .mu.m and 0.45 .mu.m and the polymeric materials having a different index of refraction such that light is reflected in the infrared portion of the spectrum. A color masking film is associated with the polymeric film which reflects light substantially uniformly over the visible portion of the spectrum to eliminate perceived iridescent color.
REFERENCES:
patent: 3247392 (1966-04-01), Thelen
patent: 3432225 (1969-03-01), Rock
patent: 3711176 (1973-01-01), Alfrey, Jr.
patent: 3972590 (1976-08-01), Gelber
patent: 4971843 (1990-11-01), Michelotti
patent: 5084356 (1992-01-01), Deak
patent: 5103337 (1992-04-01), Schrenk
Radford et al., "Reflectivity of Iridescent Coextruded Multilayered Plastic Films," Polymer Engineering and Science, vol. 13, No. 3, May 1973.
M. Ohmer, "Design of Three-Layer Equivalent Films," J. Optical Soc. of Am., vol. 68(1), pp. 137-139 (1978).
Schrenk Walter J.
Wheatley John A.
Lee Cathy K.
Ryan Patrick J.
The Dow Chemical Company
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