Multilayer infrared reflecting film with high and smooth transmission in visible wavelength region and laminate articles made therefrom
First Claim
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 a first optical layer disposed at the one end of the first effective optical packet and a second optical layer disposed at an opposite end of the first effective optical packet are selected from among the sequence of six optical layers 7A1B1A7B1A1B to reduce said variability in transmission.
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Accused Products
Abstract
A film includes a multilayer stack composed of unit cells having alternating optical layers of first and second diverse polymers A,B. The unit cells can consist essentially of two (AB), four (2A1B2C1B), or six layers (7A1B1A7B1A1B). The layers form an effective optical packet disposed between non-optical layers, the beginning and ending optical layers of which are selected to control an optical figure of merit such as spectral noise in the visible region. The arrangement of layers beginning at one end of the effective optical packet defines a specific cyclic permutation of the unit cell layer order, which provides a better figure of merit than an effective optical packet of similar design but having a different cyclic permutation.
110 Citations
14 Claims
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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;
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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 a first optical layer disposed at the one end of the first effective optical packet and a second optical layer disposed at an opposite end of the first effective optical packet are selected from among the sequence of six optical layers 7A1B1A7B1A1B to reduce said variability in transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification