HIGH-APERTURE LENS Russian patent published in 2018 - IPC G02B9/60 

FIELD: optics.

SUBSTANCE: lens can be used in night vision devices and in devices operating with optical radiation detector arrays. Lens comprises a successively arranged along the path of the beam negative component in the form of a light filter in the form of a plane-parallel plate and a plane-concave lens, inverted by its concavity to the image, glued together, biconcave lens, negative meniscus, facing by its concave to the object, block of two positive components facing each other by convexity, made in the form of biconcave and biconvex, biconvex and biconcave lenses glued together.

EFFECT: technical result is wider working spectral range to near infrared range (1 mcm), increased relative aperture to 1:1,4 , decreased vision angle in the space of objects to 58°, the use of glasses with a dispersion coefficient υ_e < 85 with preservation of high image quality in the spectral range from 0, 53 to 1 mcm.

1 cl, 2 dwg, 1 tbl