WIDE SPECTRUM SUPERAPOCHROMAT Russian patent published in 2021 - IPC G02B9/34 G02B11/20 

FIELD: optical instrumentation.

SUBSTANCE: invention relates to the field of optical instrumentation and relates to a superapochromatic lens. The lens includes two optically coupled components separated by air gap d₂. The biconvex and biconvex lenses of the first component, separated by air gap d₁, are made of two grades of glasses Y and X, respectively, and the biconvex lens and the negative meniscus of the second component, separated by air gap d₃, are made of glasses of grades Z and X, respectively. Refractive indices and Abbe numbers of glasses X, Y and Z satisfy the following conditions: 1,7≤n_X≤1,8 and 34≤v_X≤36; 1,6≤n_Y≤1,7 and 30≤v_Y≤34; 1,6≤n_Z≤1,7 and 50≤v_Z≤55, and the air gaps are such that d₂<0,0016f, d₁<d₂ and d₃<d₂, where f is the focal length of the lens.

EFFECT: invention is aimed at creating an apochromatic objective of a simple and compact design with an extended working spectral range (430-1000 nm) and improved correction of chromatic aberrations.

1 cl, 3 dwg, 1 tbl