LENS Russian patent published in 2017 - IPC G02B9/60 

FIELD: physics.

SUBSTANCE: lens contains two components. The first component contains a negative meniscus, which is turned by convexity to the object, and a plano-convex lens turned by convexity to the object. The second component contains a single negative meniscus, which is concave to the image plane, and is supplemented by a biconvex lens and a negative meniscus that is concave to the image. The biconvex lens of the second component has the ability to move along the optical axis.

EFFECT: increasing the field of view while maintaining acceptable image quality in the short-wave infrared range in the extended temperature range.

1 dwg, 1 tbl