Simplified dual field of view afocal

Details Simplified dual field of view afocal Simplified dual field of view afocal

1998-05-28

2000-09-12

Epps, Georgia

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359355, 359357, 359642, G02B 1314, G02B 300

Patent

active

061185787

ABSTRACT:
An infrared afocal lens assembly for providing an observed magnified IR ie scene with a field of view and a substantially less temperature dependent performance. The assembly includes a collecting lens, focusing lens subassembly movable along the optical axis to provide range focus, an intermediate focal plane, an eyepiece lens subassembly, and an aperture stop. A wide field of view lens subassembly may be used on the optical axis. All lenses are made of either GaAs or ZnS, and all lenses are single lenses only.

REFERENCES:
patent: 4505535 (1985-03-01), Neil
patent: 4621888 (1986-11-01), Crossland et al.
patent: 4989962 (1991-02-01), Kebo
patent: 5214532 (1993-05-01), Hall et al.
patent: 5282083 (1994-01-01), Hall
patent: 5479016 (1995-12-01), Curry et al.

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