LENS WITH BIG RELATIVE APERTURE Russian patent published in 1997 - IPC

FIELD: optical instrumentation engineering. SUBSTANCE: invention is related to high-speed lenses with medium angles of field of vision. It can find use in design of lenses for image projection from screens to optical radiation receivers, for image projection from cathode-ray tubes on to flat screens and of other projection systems of various duties. Lens includes three optical components and aperture diaphragm. First component is composed of negative meniscus 2 facing diaphragm with concavity, positive biconcave lens 3 and negative meniscus 4. Second component includes biconcave lens 5, biconvex lens 6, positive meniscus 7 facing diaphragm with concavity and biconvex lens 8. Third component has negative meniscus 9 facing diaphragm with concavity. EFFECT: expanded application field. 2 dwg, 1 tbl