LENS Russian patent published in 2018 - IPC G02B9/58 

FIELD: instrument engineering.

SUBSTANCE: lens can be used in optoelectronic devices that form images of objects of the earth's surface through the real atmosphere and operate with photodetective devices of a short-wave IR range. Lens has two components. First component is made of two lenses, the first lens is a negative meniscus, which is turned by convexity to the object, and the second is a biconvex lens. Second component is made of biconvex and biconcave lenses. Biconcave negative lens of the second component together with the photodetector device is able to move along the optical axis. Before the first lens of the first component, an aperture diaphragm is installed. Following ratios are met: Δl_2k2≤0.01∙f'_lens; f'_1-2=-(0.5–1.5)∙f'_2-2, where Δl_2k2 is the amount of movement along the optical axis of the second negative lens of the second component and the photoreceiver; f'_lens is the focal distance of the lens; f'_1-2, f'_2-2 are focal distances of the first and second lenses of the second component.

EFFECT: increase in the field of view while maintaining an acceptable image quality and ensuring stability of the focal distance in a short-wave IR range in the extended temperature range.

1 cl, 1 dwg, 2 tbl