INFRARED IMAGING DEVICE Russian patent published in 2015 - IPC G02B13/14 G02B15/16 G02B9/64 

FIELD: physics.

SUBSTANCE: device consists of series-arranged fixed first component, movable second and third components capable of moving along an optical axis, fixed fourth and fifth components, between which an intermediate image is formed, and a radiation receiver with a cooled diaphragm. The exit pupil of the device is superimposed with the cooled diaphragm of the radiation receiver. The second component comprises a negative convex-concave lens. The third component, which comprises a negative concave-convex lens, includes a positive convex-concave lens. In the fourth component, the negative lens is convex-concave. In the fifth component, which comprises a negative convex-concave lens and a positive lens, the positive lens is convex-concave.

EFFECT: high zoom ratio with a low remote shrinking coefficient.

2 dwg, 4 tbl