HIGH-APERTURE LENS Russian patent published in 2021 - IPC G02B9/34 

FIELD: optical systems.

SUBSTANCE: invention can be used in optical systems and namely in those optical systems that operate on the basis of a television CCD-matrix or in television-rangefinder optical systems. The first component is a single positive lens with the first optical surface the convex side of which faces object space. The radius of the first surface in absolute value is less than the radius of the second surface. The second component is a single positive meniscus the convex side of which faces an object. The third component is a single negative lens. The radius of the first surface of the third component is greater in absolute value than the radius of its second surface. The fourth component is a positive lens, glued from a biconvex lens and a negative meniscus the convex side of which faces an object. The following conditions are met: |R₁|=|R₇|=|R₉| where R₁, R₇, R₉ are the radii of curvature of the first, seventh and ninth optical surfaces.

EFFECT: invention improves image quality.

1 cl, 2 dwg, 5 tbl