HIGH-APERTURE LENS Russian patent published in 2016 - IPC G02B9/38 G02B13/14 

FIELD: optics.

SUBSTANCE: invention can be used in imaging devices. Lens is composed of four single meniscus facing concave to the image. First meniscus - a positive, second and third - negative, the fourth - a positive. First, second and fourth meniscus formed of germanium, the third - zinc selenide. Radius of the second optical surface along the beam modulo can be equal to the radius of the sixth optical surface. Radius of the third optical surface along the ray path in modulus can be equal to the radius of the fifth optical surface.

EFFECT: image enhancement and downsizing.

3 cl, 1 dwg, 3 tbl