Non-iridescent glass structures
OwnerRoy G. Gordoninventor
Life of this patent
Estimating the term…
Abstract
This disclosure describes transparent glass window structures of the type bearing a first coating of infra-red reflective material which is advantageously less than about 0.85 microns in thickness and wherein the observance of iridescence resulting from such a first coating is markedly reduced by provision of a second coating arranged in register with said first coating, the second coating providing at least two interfaces which, with the mass of the second coating, form means to reflect and refract light therefrom to interfere with the observation of iridescence. The invention also encompasses processes for providing such windows. A particular advantage of the invention is its efficacy with clear and lightly tinted glasses wherein the problem of iridescent color has had its greatest commercial impact.
Claims104
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein
- a second coating, is between said glass and said first coating, and said second coating
- forms means to substantially diminish iridescent colors of said first coating by providing at least two interfaces which form means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced;
- and
- wherein said second coating has a refractive index defined as about the square root of the multiple of the refractive indices of said glass and said first coating, and
- wherein said second coating has a thickness of about 1/4 wavelength of light having a vacuum wavelength of about 500 nanometers.
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein
- a second coating, is between said glass and said first coating, and said second coating
- forms means to substantially diminish iridescent colors of said first coating by providing at least two additional interfaces which form means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced;
- and
- wherein said second coating has a composite refractive index defined as about the square root of the multiple of the refractive indices of said glass and said first coating, and
- wherein second coating is comprised of 2 layers each having a thickness of about 1/4 wavelength of light having a vacuum wavelength of about 500 nanometers.
In a structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination, the improvement wherein
- a second coating, is between said glass and said first coating, and said second coating
- forms means to substantially diminish iridescent colors of said first coating by providing means, together with the mass of said second coating, to reflect and refract light such that the observability, in daylight illumination, of said iridescent colors is substantially reduced;
- and
- wherein said second coating forms a gradient, with respect to refractive index, gradually increasing between said glass and said infra-red reflecting material, from a refractive index closer to that of said glass to a refractive index closer to that of said infra-red reflective material.
A structure formed of at least one transparent glass sheet and comprising thereon a first inorganic coating of an infra-red reflective material which material is of the type that is a transparent semiconductor and normally exhibits iridescent colors in daylight illumination,
- a second coating, also of the type that normally exhibits iridescent color in daylight illumination, on a transparent sheet but is spaced from said second coating
- wherein one of said coatings differs from the other of said coatings, in thickness, by about 1/4 wavelength of 500 nanometer light, such that, together, said coatings form means to reflect and refract light which adds incoherently and markedly reduces the perceptibility of iridescence of said structure.
Dependencies are inferred from the claim text.