CaF2-free low power flat field apochromatic metallographic microobjective
A technology of apochromatic and micro-objective lenses, which is applied in microscopes, optics, instruments, etc., can solve problems such as difficulty in obtaining large-sized materials, few special optical materials, and unstable physical and chemical properties, and achieve simple structure and high cost performance. Effect
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[0021] refer to figure 1 , the present invention has no CaF 2 The low magnification plan apochromatic metallographic microscope objective lens consists of the first positive lens 1, the second negative lens 2, and the third positive lens 3, the first positive lens 1, the second negative lens 2, and the third The positive lens 3 is coaxial, and the sequence from left to right is the first positive lens 1 → the second negative lens 2 → the third positive lens 3 → object plane 4, and the object plane 4 passes through the third positive lens 3 → the first Two pieces of negative lens 2→the first piece of positive lens 1, imaging at infinity.
[0022] Lenses are CaF free 2 common optical glass material.
[0023] The present invention is free of CaF 2 Low magnification plan apochromatic metallographic microscope objective:
[0024] Working distance W.D>30mm;
[0025] Magnification β=4×-6.3×;
[0026] Numerical aperture ≥ 0.1; aperture angle > 2°;
[0027] Focal length f'=38-6...
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