EYEPIECE Russian patent published in 2017 - IPC G02B25/00 

FIELD: physics.

SUBSTANCE: eyepiece contains two components, the first of which along the rays - two-lens, glued from the biconcave and the first biconvex lens, the second component - a single second biconvex lens. In the eyepiece, the following relations are performed: |R₄|<|R₅|, |R₂|=|R₃|=|R₄|, |R₁|=|R₅|, where R₁, R₂, R₃, R₄, R₅ - radii of the first, the second, the third, the fourth, and the fifth optical surfaces. The refractive index of the first biconvex lens of the first component is greater than the refractive index of the single second biconvex lens of the second component.

EFFECT: increasing the angular field in the image space, increasing the relative aperture at a high image quality and increased workability.

1 dwg, 2 tbl