Infrared reflecting articles
First Claim
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1. An interference-coated, infrared reflecting article comprising, in sequence,(a) a substrate having a surface,(b) a first layer of a refractory dielectric,(c) a layer of silver having a thickness between about 110 and 250 A,(d) a second layer of the refractory dielectric.
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Abstract
Articles having an interference coating which reflects infrared energy are disclosed. The coating has a period of three layers in which the first and third layers are a refractory dielectric material and the intermediate, or second layer, is silver. If the period is repeated once, the cut-off between transmission and reflection is sharper than the coating having a single period.
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Citations
15 Claims
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1. An interference-coated, infrared reflecting article comprising, in sequence,
(a) a substrate having a surface, (b) a first layer of a refractory dielectric, (c) a layer of silver having a thickness between about 110 and 250 A, (d) a second layer of the refractory dielectric.
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15. A method of treating a substrate to cause it to reflect infrared light which comprises,
(1) coating the substrate with a refractory dielectric material, (2) coating the material of step 1 with about 110 to about 250 A of silver, and (3) coating the silver of step 2 with the refractory dielectric of 1.
Specification