OPTICAL SYSTEM Russian patent published in 2021 - IPC G02B9/64 

FIELD: optical systems.

SUBSTANCE: optical system can be used in television and photographic systems, as well as in measuring devices with multi-element matrix radiation detectors. The optical system consists of the first lens group containing the first negative convex-concave, the second positive convex-concave, the third negative convex-concave lens, the second lens group containing the first negative convex-concave, the second biconvex, the third negative concave-convex and fourth negative a concave-convex lens, and a radiation receiver. The following relations are fulfilled: -6,3≤fʹ₁/fʹ≤-5,3; 0,7≤fʹ_II/fʹ≤1,3; 1,2≤d_1-2/fʹ≤1,8; 0,4≤d_6-7/fʹ≤0,6, where fʹ₁ is the focal length of the first lens of the first lens group; fʹ_II - focal length of the second lens group; d_1-2 is the distance between the first and second lenses of the first lens group, d_6-7 is the distance between the third and fourth lenses of the second lens group; fʹ - focal length of the system.

EFFECT: technical result is an increase in the relative aperture of the optical system while reducing its length, simplifying the design and high image quality within the entire field of view.

1 cl, 4 tbl, 2 dwg