Uv-reflective interference layer system

A UV-reflective interference layer system for transparent substrates with broadband antireflection in the visible wavelength range, the interference layer system comprising at least four individual layers, wherein consecutive layers have different indices of refraction and the individual layers contain UV and temperature-stable inorganic materials, characterized in that the interference layer system comprises five individual layers with 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≦1.61.6>nintermediate<1.81.9≦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.