FAST LENS FOR IR SPECTRAL RANGE Russian patent published in 1995 - IPC

FIELD: optical instrument engineering. SUBSTANCE: fast lens has two components. One component is made of two menisci, which are turned with their concavities one to the other. The other component is mounted for introducing beams and is made in form of negative lens, which is turned with its concavity to subject. This component has also two positive menisci, which are turned with their convexities one to the other and disposed one relatively the other at distance, which does not excess over thickness of largest meniscus from this pair. EFFECT: improved reliability of operation. 5 dwg