发明授权
US5591517A Antireflection film 失效
防反射膜

Antireflection film
摘要:
An antireflection film comprised of a transparent base material, a first layer with a refractive index N.sub.1 of 1.45-2.10, adhered onto the base material, and a second layer with a refractive index N.sub.2 at least 0.1 smaller than N.sub.1, adhered onto the first layer. Thickness D.sub.1 (nm) of the first layer is smaller than 0.5.multidot.L.sub.1 /N.sub.1, thickness D.sub.2 (nm) of the second layer is smaller than 0.5.multidot.L.sub.1 /N.sub.2 wherein L.sub.1 is a wavelength (nm) of a visible light, and at least said first layer contains a light absorber having a principal absorbing wavelength L.sub.2 (nm) satisfying the formula:(L.sub.1 +70).ltoreq.L.sub.2 or (L.sub.1 -50).gtoreq.L.sub.2.Alternatively, thickness D.sub.1 (nm) of the first layer is between 0.5-L.sub.1 /N.sub.1 and 0.75.multidot.L.sub.1 /N.sub.1, thickness D.sub.2 (nm) of the second layer is smaller than 0.5.multidot.L.sub.1 /N.sub.2, and at least said first layer contains a light absorber having a principal absorbing wavelength L.sub.2 (nm) satisfying the formula:(L.sub.1 -200).ltoreq.L.sub.2 .ltoreq.(L.sub.1 +200).
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