REFLECTOR LENS Russian patent published in 2018 - IPC G02B17/08 G02B23/00 

FIELD: optics.

SUBSTANCE: mirror-lens objective contains a main hyperboloidal mirror, which is concave in the course of the beam, concave with the central hole, a secondary convex hyperboloidal mirror and a lens system with an optical force ϕ_l.s., made of single lens components and installed behind the main mirror. First component is a biconvex lens with spherical surfaces, the second component is negative. Between the first and second components is placed the third negative component. Optical forces of lenses satisfy the condition: ῳ_l.s./ῳ_m.s.=-4.0 – -5.5; ῳ₁/ῳ_l.s.=-2.5 – -3.0; ῳ_2./ῳ_l.s.=2.0–2.5; ῳ₃/ῳ_l.s.=-1.6 – -1.9, where ῳ_m.s. – the optical power of a mirror system consisting of a main and secondary mirrors; ῳ_l.s. – optical power of the lens system; ῳ₁, ῳ₂ and ῳ₃ – the optical forces of the lens components of the lens system. Lenses are made of materials with dispersion coefficients satisfying the following conditions: ν₁/ν₂=1.0–1.3; ν₁-ν₂=6.5–8; ν_3d=64; n_3d=1.516.

EFFECT: increased angular field and the relative aperture under diffraction-limited image quality.

1 cl, 1 dwg