Thermochromic filters and stopband filters for use with same
First Claim
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1. A thermochromic filter device comprisingeither a thermoabsorptive element or a thermoreflective element operating across a first wavelength region to block electromagnetic radiation in a hot state and pass through electromagnetic radiation in a cold state, the first wavelength region being bounded at an upper end by a first band edge;
- anda passive stopband element operating across a second electromagnetic wavelength region to block electromagnetic radiation, whereinat least a portion of second wavelength region is above the first band edge;
the total energy passed through the thermochromic filter device is optimized to a desired value for each of the hot state and the cold state.
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Abstract
Thermochromic filters use combinations of absorptive, reflective, thermoabsorptive, and thermoreflective elements covering different portions of the solar spectrum, to achieve different levels of energy savings, throw, shading, visible light transmission, and comfort. Embodiments include stopband filters in the near-infrared spectrum.
217 Citations
26 Claims
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1. A thermochromic filter device comprising
either a thermoabsorptive element or a thermoreflective element operating across a first wavelength region to block electromagnetic radiation in a hot state and pass through electromagnetic radiation in a cold state, the first wavelength region being bounded at an upper end by a first band edge; - and
a passive stopband element operating across a second electromagnetic wavelength region to block electromagnetic radiation, wherein at least a portion of second wavelength region is above the first band edge; the total energy passed through the thermochromic filter device is optimized to a desired value for each of the hot state and the cold state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A thermochromic filter device comprising
a thermoabsorptive element operating across a first wavelength region to block electromagnetic radiation in a hot state and pass through electromagnetic radiation in a cold state, the first wavelength region being bounded at an upper end by a first band edge; - and
a thermoreflective element operating across a second wavelength region to block electromagnetic radiation in the hot state and pass through electromagnetic radiation in the cold state, wherein a total energy passed through the thermochromic filter device is optimized to a desired value for each of the hot state and the cold state. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A switchable filter device comprising
a thermoabsorptive element operating across a first wavelength region to block electromagnetic radiation in a block state and pass through electromagnetic radiation in a pass state, the first wavelength region being bounded at an upper end by a first band edge; - and
a thermoreflective element operating across a second wavelength region to block electromagnetic radiation in the hot state and pass through electromagnetic radiation in the cold state, wherein a total energy passed through the switchable filter device is optimized to a desired value for each of the block state and the pass state. - View Dependent Claims (17, 18, 19, 20)
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21. A switchable filter device comprising
an absorptive element operating across a first wavelength region to block electromagnetic radiation in a block state and pass through electromagnetic radiation in a pass state, the first wavelength region being bounded at an upper end by a first band edge; - and
a reflective element operating across a second wavelength region to block electromagnetic radiation in the block state and pass through electromagnetic radiation in the pass state, wherein a total energy passed through the switchable filter device is optimized to a desired value for each of the block state and the pass state. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification