FIELD: optical instrument making.
SUBSTANCE: invention relates to optical instrument making, specifically to lenses operating with a near-infrared photodetector array. Lens has three lens groups. First lens group consists of two components – a single biconvex lens and a glued lens with a positive optical power, consisting of a biconvex lens and a concave-convex meniscus lens with a negative focal distance. Second lens group consists of a single biconvex lens. Third lens group consists of two successively arranged convex-concave meniscus lenses with a positive focal distance and a third convex-concave meniscus lens with a negative focal distance.
EFFECT: providing maximum distance of the entrance pupil while maintaining the transverse dimensions of the lens, minimum distortion.
2 cl, 4 dwg, 1 tbl
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|---|---|---|---|
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|
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| LENS HAVING EXTENDED PUPIL | 0 |
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SU1107087A1 |
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|
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| DOUBLE-SPECTRUM INFRARED LENS HAVING APERTURE DIAPHRAGM IN IMAGE SPACE | 2010 |
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RU2410733C1 |
| LENS WITH EXTENDED ENTRANCE PUPIL | 0 |
|
SU905791A1 |
