Objective lens system, relay lens system, and eyepiece lens syst

Details Objective lens system, relay lens system, and eyepiece lens syst Objective lens system, relay lens system, and eyepiece lens syst

1985-04-15

1987-04-07

Henry, Jon W.

350 14, 350569, 350474, G02B 2312, G02B 2302, G02B 912

Patent

active

046555625

ABSTRACT:
The goggles include a pair of optical assemblies, each having two intersecting optical paths, including a see-through path with a large field of view on a straight line of sight to the viewed object, and a folded path which includes an objective lens set, an intensifier which converts visible and infrared light to a visible intensified light, and an eyepiece lens set, arranged in a loop in a plane perpendicular to the see-through path. Infrared and visible light from the viewed object enters both paths. A dichroic prism combiner at the intersection of the paths reflects intensified light from the folded path into the see-through path and transmits all other light. In one embodiment a dichroic prism separator is disposed at the intersection of the paths forward of the combiner for transmitting a portion of the incoming visible light along the see-through path and reflecting the remainder of the incoming light to the folded path. In another embodiment, the entrance to the folded path is spaced from the see-through path.

REFERENCES:
patent: 3394975 (1968-07-01), Coniglio
patent: 3529882 (1970-09-01), Schmidt
patent: 3907401 (1975-09-01), Liu
patent: 3915547 (1975-10-01), Scidmore et al.
patent: 4178075 (1979-11-01), Rogers
patent: 4205894 (1980-06-01), Filipovich et al.
patent: 4266848 (1981-05-01), Schlegel
patent: 4467190 (1984-08-01), Hadani

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