Patent ID: 11960064
Assignee: BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. The MWIR lens device for remote sensing of claim 1 wherein:

−1.35<FL/FG1<−1.15;

−4.60<FL/FG2<−3.40;

2.70<FG1/FG2<3.70;

2.50<FG1/F1<3.50;

−5.00<FG1/F2<−4.00;

1.35<FG1/F3<1.85;

0.69<FG2/F4<0.93;

0.85<FG2/F5<1.15;

−2.15<FG2/F6<−1.59;

0.51<FG2/F7<0.69;

−0.55<FL/OAL<−0.45;

6.65<OAL/CSD<6.95;

2.45<V1/V2<2.65;

2.45<V1/V3<2.65;

0.95<V4/V5<1.15;

2.45<V4/V6<2.65;

2.45<V4/V7<2.65;

0.44<TP1/TP2<0.48;

0.44<TP1/TP3<0.48;

0.95<TP4/TP5<1.15;

0.44<TP4/TP6<0.48; and

0.44<TP4/TP7<0.48, wherein:
FL is a focal length of the lens device;
FG1, and FG2 are the focal lengths of the first and second optical groups correspondingly;
F1, F2, F3, F4, F5, F6, and F7 are focal lengths of the first, second, third, fourth, fifth, sixth and seventh optical elements correspondingly;
OAL is an overall length of the lens device;
CSD is a cold shield distance from the aperture stop to the focal plane array;
V1, V2, V3, V4, V5, V6, and V7 are Abbe numbers of the first, second, third, fourth, fifth, sixth and seventh optical elements correspondingly; and
TP1, TP2, TP3, TP4, TP5, TP6, and TP7 are the thermal powers of the first, second, third, fourth, fifth, sixth and seventh optical elements correspondingly.