UV-reflective interference layer system
AssigneeSchott Spezialglas GmbH
InventorsBruno Vitt, Juergen Blankenburg, Werner J. Behr, Karl-Heinz Dasecke, Birgit Lintner
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Abstract
There is provided a UV-reflective interference layer system for transparent substrates with broadband anti-reflection properties in the visible wavelength range. The interference layer system includes at least four individual layers. Successive layers have different refractive indices and the individual layers contain UV and temperature-stable inorganic materials.
Claims23
A UV-reflective interference layer system for transparent substrates with broadband antireflection in the visible wavelength range, the interference layer system comprising at least five individual layers, wherein consecutive layers of the five individual layers have different indices of refraction and the five individual layers have UV and temperature-stable inorganic materials, characterized in that the interference layer system has the following structure:
- substrate/M1/T1/M2/T2/S, wherein substrate designates the transparent substrate, M1, M2 denote layers with intermediate index of refraction, T1, T2 denote layers with high index of refraction, S denotes a layer with low index of refraction, and for a reference wavelength of 550 nm the indices of refraction of the individual layers lie in the following range:
- nlow≦1.6
- 1.6>nintermediate<1.8
- 1.9≦nhigh
- and the thickness of the individual layers lies in the following range:
- for the layer M1:
- 70 nm≦dM1≦100 nm
- for the layer T1:
- 30 nm≦dT1≦70 nm
- for the layer M2:
- 20 nm≦dM2≦40 nm
- for the layer T2:
- 30 nm≦dT2≦50 nm
- for the layer S:
- 90 nm≦dS≦110 nm.
A UV-reflective thermal protection glass, comprising at least one transparent substrate, wherein the substrate has a heat-reflecting coating on at least one side, which has a surface resistance <20 Ω,
- wherein the substrate, which has a heat-reflecting coating on at least one side, has at least one UV-reflective interference layer system disposed thereon, said at least one UV-reflective interference layer system comprising at least five individual layers in the following structure:
- M1/T1/M2/T2/S, wherein M1, M2 denote layers with intermediate index of refraction, T1, T2 denote layers with high index of refraction, S denotes a layer with low index of refraction, and for a reference wavelength of 550 nm the indices of refraction of the individual layers lie in the following range:
- nlow≦1.6
- 1.6>nintermediate<1.8
- 1.9≦nhigh
- and the thickness of the individual layers lies in the following range:
- for the layer M1:
- 70 nm≦dM1≦100 nm
- for the layer T1:
- 30 nm≦dT1≦70 nm
- for the layer M2:
- 20 nm≦dM2≦40 nm
- for the layer T2:
- 30 nm≦dT2≦50 nm
- for the layer S:
- 90 nm≦dS≦110 nm.
A UV-reflective interference layer system for a transparent substrate, comprising:
- a first layer disposed on the transparent substrate, said first layer having an intermediate index of refraction;
- a second layer disposed on said first layer, said second layer having a high index of refraction;
- a third layer disposed on said second layer, said third layer having said intermediate index of refraction;
- a fourth layer disposed on said third layer, said fourth layer having said high index of refraction;
- and
- a fifth layer disposed on said fourth layer, said fifth layer having a low index of refraction, said first through fifth layers combining to transmit less than 8% of light having an UV wavelength while transmitting greater than 90% of light having a visible wavelength.
Dependencies are inferred from the claim text.