FAST LENS Russian patent published in 2020 - IPC G02B9/34 

FIELD: optical systems.

SUBSTANCE: invention can be used in optical systems, in particular, operating with a television CCD matrix. High-aperture lens consists of four components, of which the first is a single biconvex lens with a first optical surface whose convex surface faces the object space, and the radius of the first optical surface, which is less than the radius of the second optical surface, the second component is a single positive meniscus whose convex surface faces the object space, the third component is a single biconcave lens with a radius of the first optical surface larger in magnitude than the radius of the second optical surface, and the fourth component is in form of a glued positive lens consisting of a path of biconvex lens and a negative meniscus whose concave side faces the object. Refractive index of the optical material of the biconvex lens of the glued component is less than the refraction index of the material of the negative meniscus of that component.

EFFECT: high aperture ratio at high image quality.

6 cl, 1 dwg, 4 tbl