Stock material or miscellaneous articles – Composite – Of bituminous or tarry residue
Patent
1987-11-20
1990-03-13
Arnold, Bruce Y.
Stock material or miscellaneous articles
Composite
Of bituminous or tarry residue
350164, 4289088, G02B 110, G02B 528, G32B 1800, G32B 3300
Patent
active
049078461
ABSTRACT:
An impact resistant antireflection coating for an optical element which mitigates damage to the optical element when an air flight system having the optical element is flown through a high velocity droplet impact medium is described. The coating comprises a material having a relatively high modulus of elasticity compared to the modulus of elasticity of the material of the optical element. The coating is deposited to a half wavelength thickness at a wavelength which must be maximally transmitted through the optical element. A quarter wavelength antireflection coating layer at the wavelength which must be maximally transmitted through the optical element is then disposed over the impact protection coating layer. The material of the antireflection coating is preferably of a high modulus of elasticity material having a refractive index which is intermediate the refractive index of the material of the base layer and the medium through which the airborne system is flown.
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Montanari Dennis G.
Tustison Randal W.
Arnold Bruce Y.
Edmondson David J.
Raytheon Company
Sharkansky Richard M.
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