INFRARED MIRROR-LENS SYSTEM Russian patent published in 2018 - IPC G02B17/08 G02B13/14 

FIELD: instrument engineering.

SUBSTANCE: invention can be used in thermal imaging devices based on cooled matrix radiation receivers. Infrared mirror-lens system consists of the first component located along the beams containing a positive lens and a main concave aspherical mirror with a central hole, the second component, containing the first and third positive and second negative convex-concave lenses, and a radiation receiver with a cooled diaphragm. Between the first and second components, a real intermediate image is formed. In the first component, the positive lens is convex-concave, and its convex surface with a reflective coating in the central zone works as a secondary mirror.

EFFECT: increased angular resolution with a decrease in the telecoating ratio.

1 cl, 1 dwg, 3 tbl