HIGH-SPEED LENS FOR NEAR-INFRARED REGION OF SPECTRUM Russian patent published in 2001 - IPC

FIELD: optics. SUBSTANCE: high-speed lens for near-infrared region of spectrum include two components, first component being made of biconvex lens and negative meniscus facing object with concavity and second component being biconvex lens. Proposed lens is characterized by following relations: -1,3f′<r₃<-1,0f′, 0,55f′<r₅<0,67f′, where f′ is focal distance of entire lens; is focal distance of lens of second component; r₃ is first curvature radius of second lens of first component; r₅ is first curvature radius of lens of second component. Invention provides for design of high-speed lens with angular field in space of objects over 13 degrees, with length of optical system less than 1,6f′ and rear focal length over 0,4f′ with simultaneous good quality of image over entire field. EFFECT: good quality of image over entire field. 3 dwg