LENS FOR NIGHT VISION DEVICES Russian patent published in 2022 - IPC G02B9/62 G02B13/14 

FIELD: optical technology.

SUBSTANCE: lens can be used in conjunction with electron-optical converters in night vision devices operating in low light conditions in active and passive modes. The lens consists of a biconvex lens, a complex lens, glued together from biconvex and biconcave lenses, a negative meniscus, facing the concave surface to the image plane, and a biconvex lens. A biconcave lens and a positive meniscus, facing the convex surface to the plane of the object are introduced, installed sequentially one after another between the complex glued lens and a negative meniscus. The aperture diaphragm is located between the complex glued lens and the biconcave lens. A plane-parallel plate is installed behind a biconvex lens in front of the image plane. The lenses are made of two brands of glass.

EFFECT: increase in the rapidity and focal length, an increase in image quality within the entire angular field of the lens, an increase in the rear vertex segment.

1 cl, 2 tbl, 4 dwg