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

FIELD: optical instrument making.

SUBSTANCE: infrared lens with two fields of view consists of five components located along the optical axis, the second and the third of which are movable and have two fixed positions. First component is made in the form of a positive convex-concave lens made of silicon, with its convex surface facing the plane of objects, the second component is in the form of a biconcave negative lens made from germanium, the third component is in the form of a positive convex-concave lens made of silicon with its convex surface facing the plane of objects. Fourth component is positive and is made in the form of two lenses from silicon, the first positive lens is made convex-concave, facing the convex surface to the plane of objects, the second one – as a negative concave-convex, facing the convex surface to the image plane. Fifth component is positive and comprises two lenses, the first is a positive convex-concave of silicon, the second is a negative convex-concave of fluorite, both lenses facing the object plane with their convex surfaces. Intermediate image is formed between the fourth and fifth components.

EFFECT: increased value of angular field in mode of wide field of view, improved image quality.

1 cl, 6 tbl, 12 dwg