HIGH-OUTPUT LENS Russian patent published in 2020 - IPC G02B9/34 

FIELD: physics.

SUBSTANCE: high-aperture lens consists of four components, of which the first is a single convex-plane lens, the second is a single positive meniscus whose convex surface faces the object space, third is a single biconcave lens with a radius of the first optical surface along the beam path modulus greater than the radius of the second optical surface, and the fourth is a glued positive lens consisting of a biconvex lens and a negative meniscus in the direction of the beams and facing the object with its concave side. Ratio is as follows: 0.0024 ≤ d₂/f' < 0.041, where d₂ is the value of the first air gap; f' focal distance of the entire lens.

EFFECT: technical result is high aperture ratio with high quality of image.

1 cl, 1 dwg, 4 tbl