Fig. 1. The optical structure of the infrared zoom lens

Fig. 2. The zoom motion curves

Fig. 3. The principle of the system structure

Fig. 4. The system optical diagram

Fig. 5. The general structure of the imaging system (a) the imaging system model, (b) the front view of the imaging system, (c) the cutaway view of the imaging system

Fig. 6. The finite element analysis of the system structure (a) the mesh generation, (b) the structural stress, (c) the structural displacement

Fig. 7. The laboratory imaging of the imaging system (a) the laboratory imaging, (b) focal length 6 mm, (c) focal length 40 mm, (d) focal length 80 mm, (e) focal length 120 mm, (f) focal length 168 mm, (g) focal length 210 mm, (h) focal length 250 mm, (i) focal length 290 mm, (j) focal length 330 mm

Fig. 8. The outfield imaging of the imaging system (a) the outfield imaging, (b) focal length 40 mm, (c) focal length 168 mm, (d) focal length 250 mm, (e) focal length 330 mm