1980-08-06
1983-05-17
Arnold, Bruce Y.
350 14, G02B 300
Patent
active
043837271
ABSTRACT:
An "eye-piece" system for an infra-red afocal telescope comprises a positive back element having a concave or convex back surface and a convex front surface, and a pair of elements closely spaced to define a gas lens therebetween, the back element of the pair having a convex back surface and the front element of the pair having a concave front surface, the pair of elements in combination with the gas lens therebetween being of positive power. The "eye-piece" system can be used in combination with an objective lens system to provide a collimated magnified view of a scene or object, from which infra-red radiation is received, at a real exit pupil where a scanner operates, and can provide a wide field of view of around 70 degrees or more in the scanner space.
REFERENCES:
patent: 4050779 (1977-09-01), Fleischman
patent: 4199217 (1980-04-01), Rogers
patent: 4201440 (1980-05-01), Yuta
Arnold Bruce Y.
Davis IV F. Eugene
Pilkington P.E. Limited
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