LARGE APERTURE LENS Russian patent published in 2020 - IPC G02B9/60 

FIELD: optics.

SUBSTANCE: lens can be used in optical systems operating in both visible and infrared spectral ranges. Lens consists of two components. First component along the beam path consists of three single lenses - a biconvex lens, a biconcave lens and a positive meniscus, whose concave side faces the image. Second component consists of a single biconvex lens and a glued lens of a biconvex lens and a biconcave lens, wherein in the glued lens, the refractive index of the biconvex lens material is less than the biconcave lens material refractive index for the e line.

EFFECT: technical result is high aperture ratio with high quality of image in wide spectral range.

1 cl, 1 dwg, 2 tbl