HIGH-SPEED LENS Russian patent published in 2002 - IPC

FIELD: operation in mid and far IR range of waves, IR devices. SUBSTANCE: high-speed lens has three components: first component is positive meniscus facing image with concavity, second component is plano-concave lens facing object with plane surface, third component is plano-convex lens facing object with plane surface. Refractive index of second component exceeds 2.4. Invention provides for development of lens with increased rear focal distance operating in spectral range from 8.0 to 12.5 mcm and for quality of image. EFFECT: high-quality of image. 3 cl, 1 dwg, 1 tbl