Night vision monocular with balanced optics

Details Night vision monocular with balanced optics Night vision monocular with balanced optics

1995-06-30

1997-02-18

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359355, 359399, 359641, 359793, G02B 2300, G02B 1314, G02B 904

Patent

active

056046308

ABSTRACT:
A night vision device that uses low cost optics in a balanced arrangement that corrects for distortions created by the low cost optics. The night vision device is a monocular assembly that uses a Gen II or a Gen III image intensifier tube. An objective lens assembly, containing a plurality of low cost lenses, is positioned in front of the image intensifier tube so that the objective lens assembly directs low intensity light onto the input surface of the image intensifier tube. A collimator assembly is positioned proximate the output surface of the image intensifier tube, wherein the collimator assembly collimates the visible image produced by the image intensifier tube. The collimator assembly is comprised of lenses that are identical in shape, size and material to the lenses found within the objective lens assembly. However, the lenses in the collimator assembly are arranged in reverse, as a mirror image of the lenses in the objective lens assembly. As a consequence, the lenses in the collimator assembly optically balance the lenses in the objective lens assembly correcting for any distortion, magnification or reduction created by the lenses in the objective lens assembly. This enables lower cost lenses to be used in the objective lens assembly, thereby reducing the cost of the entire night vision device. Furthermore, by using the same lenses on both sides of the image intensifier tube, the number of different optical parts is reduced as is the cost of manufacture.

REFERENCES:
patent: 4037921 (1977-07-01), Cox
patent: 4929066 (1990-05-01), Wakimoto et al.
patent: 5084780 (1992-01-01), Phillips
patent: 5305142 (1994-04-01), Phillips et al.

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