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US 4,726,654 AGranted
Multi-layered anti-reflection coating
AssigneeMinolta Camera Kabushiki Kaisha
InventorsKazuo Kimura, Shizuyo Morikage
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AssigneeMinolta Camera Kabushiki Kaisha
InventorsKazuo Kimura, Shizuyo Morikage
Estimating the term…
A multi-layered anti-reflection coating is provided having six or seven layers. The design can be defined by the following parameters: ______________________________________ N.sub.1 < 1.5 N.sub.1 d.sub.1 = 0.25.lambda..sub.0 N.sub.2 > 1.8 0.11.lambda..sub.0 < N.sub.2 d.sub.2 < 0.19.lambda..sub.0 N.sub.3 < 1.7 0.02.lambda..sub.0 < N.sub.3 d.sub.3 < 0.08.lambda..sub.0 N.sub.4 > 1.8 0.12.lambda..sub.0 < N.sub.4 d.sub.4 < 0.23.lambda..sub.0 N.sub.5 > 1.5 0.28.lambda..sub.0 < N.sub.5 d.sub.5 < 0.36.lambda..sub.0 N.sub.6 < 1.5 0.04.lambda..sub.0 < N.sub.6 d.sub.6 < 0.14.lambda..sub.0 N.sub.7 > 1.5 0 .ltoreq. N.sub.7 d.sub.7 < 0.55.lambda..sub.0 N.sub.4 > N.sub.5 > N.sub.6 ______________________________________ wherein N refers to the refractive index, d refers to the physical thickness with their respective subnumbers referring to the layer, with the first layer being the layer furthest from the substrate, and .lambda..sub.0 refers to a preselected design wavelength.
A multi-layered anti-reflection coating for use with a glass substrate to reduce reflectance of light comprising at least six layers, the first layer furthest from the substrate composed of MgF.sub.2, the second layer composed of a mixture of ZrO.sub.2 and TiO.sub.2, the third layer composed of MgF.sub.2, the fourth layer composed of a mixture of ZrO.sub.2 and TiO.sub.2, the fifth layer composed of Al.sub.2 O.sub.3, and the sixth layer composed of MgF.sub.2.
A multi-layered anti-reflection coating for use with a glass substrate to reduce reflectance of light comprising at least six layers, the first layer furthest from the substrate having a refractive index N.sub.1 and an optical thickness N.sub.1 d.sub.1, the second layer having a refractive index N.sub.2 and an optical thickness N.sub.2 d.sub.2, the third layer having a refractive index N.sub.3 and an optical thickness N.sub.3 d.sub.3, the fourth layer having a refractive index N.sub.4 and an optical thickness N.sub.4 d.sub.4, the fifth layer having a refractive index N.sub.5 and an optical thickness N.sub.5 d.sub.5, and the sixth layer having a refractive index N.sub.6 and an optical thickness N.sub.6 d.sub.6, wherein the refractive indices and the optical thicknesses are related as follows with respect to a preselected design wavelength .lambda..sub.0 selected within a wavelength range of 400 nanometers (nm) to 700 nanometers (nm):
A multi-layered anti-reflection coating for use with a glass substrate to reduce reflectance of light comprising seven layers, the first layer furthest from the substrate having a refractive index N.sub.1 and an optical thickness N.sub.1 d.sub.1, the second layer having a refractive index N.sub.2 and an optical thickness N.sub.2 d.sub.2, the third layer having a refractive index N.sub.3 and an optical thickness N.sub.3 d.sub.3, the fourth layer having a refractive index N.sub.4 and an optical thickness N.sub.4 d.sub.4, the fifth layer having a refractive index N.sub.5 and an optical thickness N.sub.5 d.sub.5, the sixth layer having a refractive index N.sub.6 and an optical thickness N.sub.6 d.sub.6, and the seventh layer having a refractive index N.sub.7 and an optical thickness N.sub.7 d.sub.7, wherein the refractive indices and the optical thicknesses are related as follows with respect to a preselected design wavelength .lambda..sub.0 selected within a wavelength range of 400 nanometers (nm) to 700 nanometers (nm):
Dependencies are inferred from the claim text.