Non-iridescent glass structures

  • US 4,308,316 A
  • Filed: 10/11/1979
  • Issued: 12/29/1981
  • Est. Priority Date: 04/04/1977
  • Status: Expired due to Term
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First Claim
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1. In a process for avoiding the loss of heat from a building through transparent glassed areas of the building, while achieving an iridescence-free appearance for said areas, said process comprising the step of reflecting infra-red radiation back into said building from a thin coating of an infra-red-reflective semiconductor film which normally exhibits iridescence on the surface of said glass, the improvement comprising the step of utilizing a transparent intermediate layer of a metal nitride, metal oxide, or mixture thereof, between said glass and said thin coating to provide at least two interfaces associated with said intermediate layer;

  • said interfaces, together with the mass of said intermediate layer being utilized to achieve said iridescence-free apearance in daylight illumination, and wherein said intermediate layer is selected to have a refractive index defined as about the square root of the multiple of the refractive indices of said glass and said infra-red-reflective film, and depositing said intermediate layer an optical thickness of about 1/4 wavelength of light having a vacuum wavelength of about 500 nanometers.

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