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Multilayer infrared reflecting film with high and smooth transmission in visible wavelength region and laminate articles made therefrom

  • US 20040004778A1
  • Filed: 07/03/2003
  • Published: 01/08/2004
  • Est. Priority Date: 01/15/2001
  • Status: Active Grant
First Claim
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1. An optical body comprising at least a first effective optical packet of contiguous optical layers bounded by optically thick layers, the optical layers composed of alternating diverse materials A, B;

  • wherein the optical layers when counted from one end of the first effective optical packet form a plurality of unit cells each having six optical layers arranged in relative optical thicknesses in a first cyclic permutation of 7A1B1A7B1A1B;

    wherein at normal incidence the first effective optical packet provides a reflection band at infrared wavelengths and substantially transmits light at visible wavelengths;

    wherein the materials A, B have refractive indices that satisfy a relationship nA>

    nB along at least one in-plane axis, and wherein the optically thick layers that bound the first effective optical packet have a refractive index nC along the at least one in-plane axis;

    wherein the optical body exhibits a variability in transmission over a visible wavelength range; and

    wherein said variability in transmission is lower than that exhibited by a second optical body identical to the first-mentioned optical body except for having a second effective optical packet substituted for the first effective optical packet, the second effective optical packet having optical layers arranged in a second cyclic permutation of 7A1B1A7B1A1B different from the first cyclic permutation.

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