RETROREFLECTIVE ELEMENT Russian patent published in 2022 - IPC G02B5/126 

FIELD: location; ranging.

SUBSTANCE: invention can be used in monitoring of a state of environment in laser location and ranging systems. A retroreflective element is made in the form of a biconvex composite lens, in which curvature centers of the first and the last surfaces coincide. The second surface of the first lens and the first surface of the second lens are made flat, and lenses are interconnected with flat surfaces. A thickness of the first lens d₁ is equal to a curvature radius of the first surface R₁, a thickness of the second lens d₂ is determined from an expression d₂=(S'-d₁)±δ, where S₁' is a distance to the Gauss plane of the first surface of the first lens, δ is a correction, a value of which is selected from a condition of provision of correction of wave aberration of a wide radiation bundle. A curvature radius of the last surface R₂ is equal to d₂. A refractive index of the first lens material is less than or equal to a refractive index of the second lens material.

EFFECT: provision of a wide range of back reflection angles, including at large distances to a radiation source, ease of a structure and a manufacturing process.

2 cl, 1 dwg, 4 tbl