External compass module for night vision devices

Details External compass module for night vision devices External compass module for night vision devices

1992-11-30

1993-12-14

Hannaher, Constantine

Radiant energy

Infrared-to-visible imaging

362 29, G05D 2500, F41G 132

Patent

active

052705455

ABSTRACT:
An external compass module for use with a night vision device. The module includes an annular ring which is adapted to fit a portion of the night vision device which contains the objective lens. The module further includes an enclosure having an internal chamber. A compass sensor having an angular scale for indicating direction is positioned within the chamber. Optical elements are positioned adjacent to the scale which relay and collimate an image of the scale to a reflecting lens element. The reflecting lens element then reflects the scale image toward the objective lens which results in the superimposition of the scale image on a scene being viewed by the user.

REFERENCES:
patent: 4402140 (1983-09-01), Nagae

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