MIRROR LENS Russian patent published in 2023 - IPC G01B17/08 

FIELD: optics.

SUBSTANCE: mirror lens contains two correction elements, a convex and a concave mirror, a two-lens aplanatic corrector and an aperture diaphragm on the spherical surface of the convex mirror, the annular zone of the concave mirror is located on the second spherical surface of the first correction element, the convex mirror is located on the first spherical surface of the second corrective element. Corrective elements and corrector lenses are made of the same optical material. Relations between the radii of curvature of the convex and concave mirrors and the diameters of the aperture diaphragm and the convex mirror are satisfied.

EFFECT: possibility of constructing an image in one plane for UV, visible and IR ranges of the spectrum from 0.15 to 10 µm with the same value of the focal length in different spectral ranges, protection of the input aperture from external influences, fastening of a convex mirror without vignetting of light beams, increasing aperture ratio and maintaining a wide field of view.

1 cl, 1 dwg, 1 tbl