HIGH-APERTURE LENS Russian patent published in 2018 - IPC G02B9/62 

FIELD: optics.

SUBSTANCE: lens can be used in digital aiming-observation devices with CCD or CMOS matrices. Objective lens has four components. First component contains a biconvex lens and a negative concave-convex lens, convex to the image space. Second component is a single positive meniscus, facing its concavity to the image space. Third component contains a negative meniscus and a positive meniscus, facing its concavity to the space of images. Fourth component is the negative meniscus, which is concave towards the image space. Aperture diaphragm is located in front of the first component. Air gap between the first and second components satisfies the condition set forth in the claims.

EFFECT: increase in luminosity to a value of 1:0,85 with the expansion of the spectral operating range to values Δλ=(600…1,000) nm and image quality improvement.

1 cl, 1 dwg, 1 tbl