INFRARED LENS WITH TWO FIELDS OF VIEW Russian patent published in 2015 - IPC G02B13/14 G02B9/60 G02B15/14 

FIELD: physics.

SUBSTANCE: lens has three components. The first fixed component comprises a first positive convex-concave lens and a second biconvex lens, the second surface of which is aspherical. The second component comprises a negative lens, the first surface of which is aspherical, and is configured to move along an optical axis. The third fixed component comprises a first biconvex lens and a second positive lens. The second movable component is located between the first and second lenses of the fixed first component.

EFFECT: improved energy characteristics and angular resolution of the lens due to a larger diameter of entrance pupil and focal distance.

5 cl, 1 dwg, 3 tbl