Flat-field apochromatic metallographic microscope objective with magnification power being 40 and without CaF2
An apochromatic, microscope objective lens technology, used in microscopes, optics, instruments, etc., can solve the problems of low refractive index, difficult to obtain materials, high cost, and achieve the effect of high cost performance, simple structure, and small number of lenses
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[0019] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
[0020] refer to figure 1 , a CaF-free 2 40× plan apochromatic metallographic microscope objective lens, composed of 8 elements without CaF 2 The convex lens and concave lens made of optical glass are divided into three light groups, each lens is coaxial with the center of the object plane, and the order from left to right is infinity image plane 1, the first convex lens 2, the second concave lens 3, The third concave lens 4, the fourth convex lens 5, the fifth concave lens 6, the sixth convex lens 7, the seventh convex lens 8, the eighth convex lens 9, the object plane 10, the distance between the first surface and the convex lens is Infinity, the distance from the vertex of the eighth convex lens 9 to the object plane is W.D.
[0021] Among the 3 optical groups, the first optical group is made up of the first convex lens 2 and the second c...
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