INFRARED SYSTEM WITH THREE FIELDS OF VIEW Russian patent published in 2021 - IPC G02B13/14 G02B15/14 

FIELD: optical instrumentation.

SUBSTANCE: invention relates to the field of optical instrumentation and relates to an infrared system with three fields of view. The system contains a focusing lens, a projection lens and a photodetector with a cooled diaphragm. The focusing lens consists of a first component sequentially located along the optical axis, containing a positive and negative convex-concave lens, a second component containing a biconcave lens, and a third component containing a positive convex-concave lens. The projection lens consists of a first and second positive concave-convex lens and a third positive convex-concave lens. The second and third components are installed with the ability to move the lenses along the optical axis independently of each other. All lenses are aspherical.

EFFECT: invention decreases the tele-shortening coefficient and the amount of movement of the second movable component.

1 cl, 2 dwg, 4 tbl