GRADIENT LENS Russian patent published in 2006 - IPC G02B3/00 

FIELD: gradient optics.

SUBSTANCE: gradient lens can be also used in fiber optics and optical instrument engineering. Gradient lens has thickness d along its optical axis z. Lens is limited by first convex refracting surface of rotation with generator y₁(z) and by second concave refracting spherical surface with radius R₂. Lens has spherical-concentric distribution of refractivity in material of lens, which distribution is defined by formula of n(x, y, z) =n₀/f (√x²+y²+ (z-f) ²), where n₀ is refractivity at vertex of first refracting surface; f=d+s' which has to be distance from vertex of first surface to center of spherical-concentric distribution of refractivity; s'=R₂ which has to be rear cut. Center of spherical-concentric distribution of refractivity coincides with center of second surface at optical; axis. Generator of first refracting surface in plane, which goes through center of spherical-concentric distribution of refractivity, is defined by relation of y² ₁=-z²+2fz+2f/n₀ ²((n₀s+f)-√2n₀ ²(f+s)z+(n₀s+f)²), where s if front cut. Lens converts entrance divergent homocentric beam from object being at specific distance from axis, into exit convergent homocentric beam, which is focused in center of distribution of refractivity.

EFFECT: improved exploitation capabilities.

2 dwg, 1 ann