REFLECTOR LENS Russian patent published in 2018 - IPC G02B17/08 

FIELD: optical devices.

SUBSTANCE: lens can be used in optoelectronic devices that form images of objects of the earth's surface through the real atmosphere in the short-wave IR range. Lens contains four components and an aperture diaphragm, located in front of the first component. First component contains convexo plane lens. Second component is Mangin negative lens, the third is an oblique flat mirror, the fourth is made of a positive meniscus, which is turned by convexity to the object, and a negative meniscus, turned by convexity to the object. Coefficients of linear expansion of the material of the frames and rings for the air gaps between the components are equal to each other. Relation is fulfilled: where is the focal length of the first lens of the fourth component; is the focal length of the second lens of the fourth component.

EFFECT: technical result is an increase in the field of view while maintaining an acceptable image quality and ensuring stability of the focal length of the lens in the short-wave IR range and in the extended temperature range.

1 cl, 2 dwg, 3 tbl