NIGHT VISION DEVICE Russian patent published in 2004 - IPC

FIELD: night vision devices.

SUBSTANCE: device has lens, image intensifier assembly, erecting system, and eyepiece. Image intensifier assembly has first image intensifier disposed between lens unit and erecting system and second image intensifier placed between erecting system and eyepiece. Erecting system is made in the form of symmetrical one-fold magnification erecting system assembled of two similar three-lens units with parallel beam path between them. Focal length of erecting system and that of lens units are interrelated by following expression: 1.35F'es < F'l < 1.75F'es, where F'es is focal length of erecting system, mm; F'l is focal length of lens units, mm.

EFFECT: enlarged functional capabilities due to use of changeable eyepieces; reduced power requirement and labor consumption.

2 cl, 1 dwg