OPTICAL ARTICLE HAVING A TEMPERATURE-RESISTANT ANTI-REFLECTION COATING WITH OPTIMIZED THICKNESS RATIO OF LOW INDEX AND HIGH INDEX LAYERS
The present invention relates to an optical article having anti-reflection properties and high thermal resistance, comprising a substrate having at least one main face coated with a multi-layer anti-reflection coating comprising a stack of at least one high refractive index layer and at least one lo...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | The present invention relates to an optical article having anti-reflection properties and high thermal resistance, comprising a substrate having at least one main face coated with a multi-layer anti-reflection coating comprising a stack of at least one high refractive index layer and at least one low refractive index layer, wherein the ratio: R T = sum of the physical thicknesses of the low refractive index layers of the anti - reflection coating sum of the physical thicknesses of the high refractive index layers of the anti - reflection coating is higher than 2.1. If the anti-reflection stack comprises at least one low refractive index layer having a physical thickness 100 nm which is not the outermost layer of the anti-reflection coating, said relatively thick layer and the underlying layers are not taken into account in RT calculation. |
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