Transparent anti-reflective coating
First Claim
1. An anti-reflective coating comprising a silicon film and a silicon dioxide film over the silicon film, the anti-reflective coating being substantially transparent to visible light.
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Accused Products
Abstract
An anti-reflective coating employing silicon as a high refractive index material in a film pair together with silicon dioxide as a low refractive index material is found to be substantially transparent to visible light and to provide good anti-reflectance where the silicon film is ultra-thin, preferably less than about 50 Angstroms and the thickness of the silicon dioxide film is matched to that of the silicon 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.
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Citations
13 Claims
- 1. An anti-reflective coating comprising a silicon film and a silicon dioxide film over the silicon film, the anti-reflective coating being substantially transparent to visible light.
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4. An anti-reflective coating comprising a silicon film having a thickness between about 10 and 40 Angstroms and a silicon dioxide film directly over the silicon film having a thickness between about 1000 and 1300 Angstroms, the anti-reflective coating having at least about 70% transmittance and less than about 8% reflectance of visible light incident on the anti-reflective coating.
- 5. A glazing unit comprising a substrate and an anti-reflective coating which is substantially transparent to visible light on a surface of the substrate, the anti-reflective coating comprising a silicon film and a silicon. dioxide film over the silicon film.
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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 a silicon film directly on the surface of the substrate and having a thickness between 10 and 40 Angstroms, and a silicon dioxide film directly over the silicon film and having a thickness between about 1000 and 1300 Angstroms, the glazing unit having at least about 70% transmittance, and less than about 8% reflectance of visible light.
- 10. A laminated glazing unit comprising an exterior ply, a substantially inextensible substrate ply laminated to the exterior ply by a laminating layer of flexible polymeric material, and an anti-reflective coating on a major exterior surface of the substrate ply, the anti-reflective coating comprising a silicon film directly on the surface of the substrate ply and a silicon dioxide film directly over the silicon film, the laminated glazing unit being substantially transparent to visible light.
Specification