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

FIELD: gradient optics.

SUBSTANCE: aplanatic gradient lens can be used in fiber optics and optical instrument engineering. Aplanatic gradient lens is confined by first and second refracting surfaces of rotation. Lens has thickness of c along optical axis z, which thickness is multiple to doubled focal length. Lens is made of material with radial distribution of refractivity factor n(y). Lens has shape of refracting surfaces which shape is defined by relation of generator z(y) of z'(y) = y/n(y)√y²+(z(y)+s_F)² - (z(y)+s_F), where z'(y) is first derivative of z(y) and s_F is front cut. Distribution of refractivity factor of lens' material looks like n(y) = n₀sec h a y=2n₀/e^ay+e^-ay, where n₀ is meaning of refractivity factor at axis and a is constant. Generators of first and second surfaces are defined by the following relations: y² ₁(z)=(n²(y)-1)z²+2s_F(n(y)-1)z and y² ₂(z)=(n²(y)-1)(z-c)²+2s_F(n(y)-1)(z-c).

EFFECT: improved quality of image; simplified process of manufacture.

4 dwg, 1 appl