HIGH-OUTPUT LENS Russian patent published in 2020 - IPC G02B9/60 

FIELD: physics.

SUBSTANCE: lens can be used in infrared systems, as well as in systems operating with a television CCD matrix. High-aperture lens has five components, the first of which along the beam path is a single positive meniscus whose convex surface faces the object, second is a single negative meniscus whose convex side faces the object, the third is a negative two-glued meniscus whose outer, convex surface faces the image and is along the direction of beams from a biconcave and a biconvex lens, a fourth is a single biconvex lens and a fifth is a single positive meniscus whose concave side faces the image. Following conditions are met: 1.57 < n₄ < 1.63; 1.6 < n₆ < 1.63, |R₄| < |R₅|, where: R₄, R₅, are radii of the fourth and fifth optical surfaces along the beam path; n₄, n₆ are refraction indices of the fourth and sixth lenses on beam path for line e.

EFFECT: technical result is improved image quality.

5 cl, 1 dwg, 4 tbl