HIGH-OUTPUT LENS Russian patent published in 2019 - IPC G02B9/34 G02B9/60 

FIELD: optics.

SUBSTANCE: first component comprises a biconvex lens and a negative concave-convex lens facing the image space with its convexity. Second and third components are single positive meniscus lenses, which face with their concavity to image space. Fourth lens is a negative lens. Aperture diaphragm is located before the first surface of the first component. Following relations are satisfied: d_1-2= (0.4÷1.5)⋅F_OB, d_2-3= (0.2÷1.0)⋅d_1-2, where F_OB focal length of the lens; d_1-2 air gap between first and second components; d_2-3 is the air gap between the second and third components. Technical result is an increase in the luminosity of the lens to value of 1:0.9 and broadening the operating spectral range to values Δλ= (600…1000) nm with no glued components and with preservation of image quality.

EFFECT: lens can be used in digital sighting and surveillance devices with CCD or CMOS matrices in various operating conditions day and night.

1 cl, 2 dwg, 1 tbl