INFRARED TELEPHOTO LENS WITH TWO FIELDS OF VIEW Russian patent published in 2024 - IPC G02B13/14 G02B15/16 

FIELD: optical instrument making.

SUBSTANCE: infrared telephoto lens with two fields of view has four components along the beam path. First one — the fixed component is made in the form of positive and negative menisci whose convexities face the plane of objects, the first surface of the negative meniscus is aspherical. Second component is a movable biconcave lens. Third is a fixed positive component containing a positive biconvex lens and a positive meniscus whose convex side faces the plane of the objects; the second surface of the meniscus is aspheric-diffraction. Fourth is a fixed positive component, which includes a single fixed positive lens, the second surface of which is aspheric-diffraction, wherein the positive lens has a biconvex shape.

EFFECT: simplification of manufacturing at low tele-shortening coefficient, improvement of image quality.

1 cl, 1 tbl, 8 dwg