Thermal control interface coatings and pigments
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Abstract
The invention provides an optical structure with low chroma and brightness in the visible region and low emissivity in the infrared region. The optical structure includes an interference structure having an infrared reflective layer and an infrared absorbing thin film layer. These layers are in turn separated by a thin film spacer of a dielectric or semiconductor material. The reflectivity and transmission of the layers are selectively controlled through the thickness of the layers such that the visual reflectivity and color is independent of the infrared properties of the absorber and reflector layers.
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Citations
136 Claims
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1-73. -73. (canceled)
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74. An optical structure comprising:
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a reflector;
a spacer layer with a spacer thickness disposed on the reflector; and
an absorber layer disposed on the spacer layer, the absorber layer having an absorber thickness providing a transmittance through the absorber layer between 5-85% wherein the reflector has a reflector thickness, the spacer thickness and the absorber thickness are selected to achieve an average first reflectivity of not more than 50% between 400-700 nanometers and an average second reflectivity of not less than 50% between 4-40 microns. - View Dependent Claims (75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119)
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120. An optical structure comprising:
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a reflector;
a spacer layer with a spacer thickness disposed on the reflector; and
an absorber layer disposed on the spacer layer, the absorber layer having an absorber thickness providing a transmittance through the absorber layer between 5-85%, the spacer thickness being selected so as to provide an average reflectance of the optical interference structure less than 50% reflectivity between 400-700 nm and a chroma of the optical interference structure less than 20. - View Dependent Claims (121, 122, 123)
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124. An optical interference structure comprising:
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a reflector having a reflectivity of at least 50% over a wavelength range of 4-40 microns;
a spacer layer disposed on the reflector having a spacer layer thickness of between 1 quarter-wave optical thickness at a first wavelength of 200 nm and 2 quarter-wave optical thicknesses at a second wavelength of 500 nm, the spacer layer having a refractive index less than 2; and
an absorber layer with an absorber layer thickness selected to provide an average reflectance of the optical interference structure less than 20% between 400-700 nm. - View Dependent Claims (125, 126, 127, 128, 129, 130)
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131. An optical interference structure comprising:
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an aluminum reflector;
a first dielectric layer disposed on the aluminum reflector, the first dielectric layer comprising MgF2 having a first dielectric thickness of 55 nm;
a first absorber layer comprising 7 nm of chromium disposed on the first dielectric layer;
a second dielectric layer disposed on the first absorber layer, the second dielectric layer comprising MgF2 having a second dielectric thickness of 55 nm; and
a second absorber layer comprising 2.5 nm of chromium disposed on the second dielectric layer, the second absorber layer. - View Dependent Claims (132, 133)
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134. An optical interference structure comprising:
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a substantially opaque aluminum reflector a dielectric layer comprising ZnS being 1 quarter-wavelength optical thickness at a wavelength between 200-1400 nm; and
an absorber layer having an internal transmittance between 5-85%.
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135. An optical interference structure comprising:
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an aluminum reflector a dielectric layer comprising MgF2 being 1 quarter-wavelength optical thickness at a wavelength of 500 nm; and
an absorber layer comprising 20 nm of chromium. - View Dependent Claims (136)
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Specification