Anti-reflective transparent coating
First Claim
1. An anti-reflective coating comprising an Si1-x Hx film and a silicon dioxide film over the Si1-x Hx film, x being a positive number less than 0.4, the anti-reflective coating having a transmittance of at least 50% to visible light.
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Accused Products
Abstract
An anti-reflective coating employing Si1-x Hx as a high refractive index material in a film pair together with SiO2 as a low refractive index material is found to be substantially transparent to visible light and to provide good anti-reflectance where the Si1-x Hx film is ultra-thin, preferably less than about 80 Angstroms, and the thickness of the SiO2 film is matched to that of the Si1-x Hx film. Laminated glazing units having such anti-reflective film can be used, for example, even in applications requiring high transmittance of visible light, such as motor vehicle windshields, in view of the substantial transparency of the coating.
86 Citations
19 Claims
- 1. An anti-reflective coating comprising an Si1-x Hx film and a silicon dioxide film over the Si1-x Hx film, x being a positive number less than 0.4, the anti-reflective coating having a transmittance of at least 50% to visible light.
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4. An anti-reflective coating comprising an Si1-x Hx film having a thickness of about 50 Angstroms and a SiO2 film directly on the Si1-x Hx film having a thickness of about 1400 Angstroms, x being about 0.11, the anti-reflective coating having at least 70% transmittance and less than 8% reflectance of visible light incident on the anti-reflective coating.
- 5. A glazing unit comprising a glazing substrate having a transmittance of at least 50% to visible light and an anti-reflective coating having a transmittance of at least 50% visible light on a surface of the glazing substrate, the anti-reflective coating comprising an Si1-x Hx film and a SiO2 film over the Si1-x Hx film, x being a positive number less than 0.4.
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9. A glazing unit comprising a substrate and an anti-reflective coating on a surface of the substrate, the anti-reflective coating comprising an Si1-x Hx film directly on the surface of the substrate and having a thickness of about 50 Angstroms, and a SiO2 film directly on the Si1-x Hx film having a thickness of about 1400 Angstroms, x being about 0.11, the glazing unit having at least about 70% transmittance and less than about 8% reflectance of visible light.
- 10. A laminated glazing unit comprising a first ply, a substantially inextensible substrate ply having a first surface laminated to the first ply by a laminating layer of flexible polymeric material, and an anti-reflective coating on a second surface of the substrate ply, the second surface being substantially parallel and coextensive with, and opposite to, the first surface, the anti-reflective coating comprising an Si1-x Hx film directly on the surface of the substrate ply and a SiO2 film directly over the Si1-x Hx film, x being a positive number less than 0.4, the laminated glazing unit having a transmittance of at least 50% to visible light incident on the anti-reflective coating.
- 14. A method of making a glazing unit with an anti-reflective coating said glazing unit having a transmittance of at least 50%, the method comprising depositing an Si1-x Hx film on a surface of a substrate ply of the glazing unit and then depositing a SiO2 film over the Si1-x Hx film, wherein x is a positive number less than 0.45.
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19. A method of making a laminated glazing unit having a transmittance of at least 50%, comprising the steps of:
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A) depositing a 30 to 80 Angstroms thick Si1-x Hx film onto a major surface of a substantially inextensible substrate ply, wherein x is a positive number less than 0.40, by sputtering silicon in an atmosphere comprising hydrogen; B) then depositing a 1200 to 1600 Angstrom thick SiO2 film directly over the Si1-x Hx film by sputtering silicon in an atmosphere comprising oxygen; and C) then sandwiching a flexible polymeric laminating ply between the substrate ply and an additional ply and laminating the same, the major surface with the anti-reflective coating therein being an exterior surface of the glazing unit.
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Specification