Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1978-04-26
1980-05-13
Corbin, John K.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351 49, G02C 712, G02B 530
Patent
active
042026016
ABSTRACT:
A filter arrangement is described which is incorporated with a night vision device. The filter arrangement consists of a variable density polaroid filter array and a blue-green filter all contained in a common housing and directed along a given optical path. The filter arrangement serves to control the amount of light directed to an input port of a night vision device such as a pair of goggles. In this manner, a user can be trained to employ the night vision device under direct supervision in daylight conditions and by variation of the polarizing plates is enabled to simulate nighttime conditions.
REFERENCES:
patent: 2199715 (1940-05-01), Sauer
patent: 4037921 (1977-07-01), Cox
Burbo James H.
Hartman Louis P.
Bovernick Rodney
Corbin John K.
International Telephone and Telegraph Corporation
O'Halloran John T.
Van Der Sluys Peter C.
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