HIGH-APERTURE LONG-FOCUS LENS Russian patent published in 2024 - IPC G02B9/64 

FIELD: optical instrument making.

SUBSTANCE: high-aperture long-focus lens consists of three optical components, first of which is positive, it consists of sequentially located along the path of the rays a positive plano-convex lens with its convex surface facing the plane of the objects, a negative biconcave lens and a positive plane-convex lens with its convex surface facing the plane of the objects. Second component is positive and consists of first positive biconvex lens on the path of the rays, first negative convex-concave meniscus whose convex surface faces the plane of objects, a second negative convex-concave meniscus whose concave surface faces the plane of objects and a second positive biconvex lens. Third component consists of a positive convex-concave lens on the path of the rays, the first one on the path of the rays facing the plane of objects, and of a negative biconcave lens located behind the positive convex-concave lens. Behind the third component there is a flat-parallel plate installed in the optical scheme of the latter along the ray path.

EFFECT: high technological effectiveness while maintaining high image quality in the spectral range of 400–700 nm, high level of aberration correction of the image and enlarging the linear field of the image.

1 cl, 2 dwg, 3 tbl