OPTICAL SYSTEM Russian patent published in 2018 - IPC G02B9/60 

FIELD: optics.

SUBSTANCE: invention can be used in optical devices that form an image with a significant removal of the entrance or exit pupil. Optical system contains four components along the path of the rays. First component is a single positive lens and a negative three-glazed lens, containing the first biconcave lens along the rays, the second and third lenses in the form of positive meniscus facing concavities to the image. Second and third components are made in the form of positive single lenses, equal in values to the radii of optical surfaces, thicknesses and grades of glasses and facing each other by convex spherical surfaces of curvature equal in absolute value. Fourth component is made in form of a single negative meniscus, which is turned by a concavity to the image.

EFFECT: high image quality.

1 cl, 1 dwg, 2 tbl