Large-view-field catadioptric fundus camera optic system
An optical system, catadioptric technology, applied in the optical system field of large field of view catadioptric fundus cameras, can solve the problems of difficult manufacturing and assembly of off-axis retinal objective lens without diopter compensation, small imaging field of view, complex structure, etc. , to reduce the difficulty of processing and manufacturing, reduce the difficulty of assembly and adjustment, and solve the effect of large field of view
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Specific embodiment one
[0015] Combine figure 1 Describe this embodiment, figure 1 It is a schematic diagram of the optical principle of the optical system of a large-field reflex type fundus camera of the present invention. The figure includes the optical model of the human eye 1, the clear aperture 2, the reflective omentum objective lens 3, and the reflective omentum objective lens. Mirror 4, hollow mirror 5 (the hollow part is also the aperture diaphragm of the imaging system), refraction type illumination relay lens group 6, illumination diaphragm 7, refraction type illumination condenser lens group 8, light source 9, refraction type focusing lens group 10. Refractive focusing imaging group 11, camera 12. The present invention adopts coaxial illumination, the illumination light path A and the imaging light path B share the clear aperture 2 of the omentum objective lens, the primary mirror 3 of the reflective omentum objective lens and the secondary mirror 4 of the reflecti...
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Specific embodiment two
[0020] Combine figure 2 , image 3 with Figure 4 Explain this embodiment
[0021] figure 2 This is the optical structure diagram of the omentum objective lens used in this embodiment, figure 2 The omentum objective in is image 3 Illumination light path and Figure 4 The common part of the imaging optical path, pupil 1-1 (object side), clear aperture 2, reflective retina objective primary mirror 3 and reflective retina objective secondary mirror 4, hollow mirror 5 (image side) on the same optical axis (Folding optical axis) placed in order. The magnification is 1.5, the pupil (object side) 1-1 is 6mm, the image side 5 is 9mm, and the front working distance is 48mm.
[0022] The structural parameters of the primary mirror of the reflective retina objective lens, the secondary mirror of the reflective retina objective lens and the hollow mirror in this embodiment are given below:
[0023] Table 1
[0024]
[0025] Table 2
[0026]
[0027] Table 1 shows th...
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