Infra-red optical systems

Details Infra-red optical systems Infra-red optical systems

1984-01-24

1986-07-15

Corbin, John K.

350443, 350453, G02B 300, G02B 2300

Patent

active

046002650

ABSTRACT:
An `eye-piece` system for a non-Galilean afocal infra-red telescope designed to contribute to astigmatism correction, pupil match, and true afocality without undue increase in objective aperture requirements comprises a positively powered back group and a negatively powered front group consisting of a rear lens element with a convex rear surface and a front lens element with a concave front surface, there being a negatively powered gas lens between the rear and front elements of the front group. The objective system may be catadioptric.

REFERENCES:
patent: 3947084 (1976-03-01), Noyes
patent: 4398786 (1983-08-01), Neil
patent: 4432596 (1984-02-01), Campbell et al.

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