LENS FOR NIGHT VIEWERS Russian patent published in 2009 - IPC G02B9/62 G02B11/32 G02B13/14 

FIELD: instrument making.

SUBSTANCE: lens comprises six optical components, the first of which from the side of object space is arranged in the form of single convexo-convex lens. The second component is made in the form of patch of two lenses, the first of which - convexo-convex lens, the second - concavo-concave lens, with convexo-convex lens inverted to the first component. The third component - single concavo-concave lens. The fourth component is made in the form of patch from convexo-convex and concavo-concave lenses, besides convex surface of patch is inverted to the third component. The fifth component is made in the form of single convexo-convex lens, the sixth component - single negative meniscus, which is inverted with its concave surface to the fifth component.

EFFECT: provides for reduction of aberrations, also along edge of visual field, and also obtainment of high values of polychromatic frequency-contrast characteristics in the field of higher spatial frequencies with account of spectral characteristics of photocathode.

3 dwg