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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

Inactive Publication Date: 2015-04-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In order to correct axial chromatic aberration and secondary spectrum at the same time in the objective lens, the conventional method is to introduce optical crystals, such as calcium fluoride CaF 2 etc. as manufacturing materials, but there are very few special optical materials, brittle, unstable physical and chemical properties, and large-sized materials are more difficult to obtain
"Handbook of Practical Optical Technology" (2006, Beijing: Machinery Industry Press) edited by Wang Zhijiang mentioned a domestic similar 40× plan achromatic microscope objective lens, which consists of 7 lenses, 2 of which use low refraction FK series glass with low rate, high cost

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  • Flat-field apochromatic metallographic microscope objective with magnification power being 40 and without CaF2
  • Flat-field apochromatic metallographic microscope objective with magnification power being 40 and without CaF2
  • Flat-field apochromatic metallographic microscope objective with magnification power being 40 and without CaF2

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Embodiment Construction

[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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Abstract

The invention discloses a flat-field apochromatic metallographic microscope objective with magnification power being 40 and without CaF2. The metallographic microscope objective is composed of 8 lenses divided into 3 groups. The work distance W.D. of the microscope objective is 0.15 mm, the magnification power is 40, the numerical aperture is larger than 0.7, the aperture angle omega is larger than 2 degrees, and the effective focal length f' is 6.27 mm. The metallographic microscope objective can be widely applied to various metallographic microscope devices, and has the advantages that the metallographic microscope objective without the CaF2 achieves the flat-field apochromatic effect, a high performance cost ratio is achieved, and the structure is simple.

Description

technical field [0001] The invention relates to a microscope objective lens, in particular to a CaF-free 2 40× plan apochromatic metallographic microscope objective. Background technique [0002] Microscopic objective lens is an important component of metallographic microscope, and its imaging quality directly affects the performance of metallographic microscope. The plan apochromatic microscope objective is the microscope objective with the best image quality and the highest grade. In order to correct axial chromatic aberration and secondary spectrum at the same time in the objective lens, the conventional method is to introduce optical crystals, such as calcium fluoride CaF 2 etc. as manufacturing materials, but there are very few special optical materials, brittle, unstable physical and chemical properties, and large-sized materials are more difficult to obtain. "Handbook of Practical Optical Technology" (2006, Beijing: Machinery Industry Press) edited by Wang Zhijiang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B21/02G02B21/00G02B1/00
CPCG02B21/025G02B1/00G02B21/0004
Inventor 萧泽新高兴宇肖华鹏
Owner GUILIN UNIV OF ELECTRONIC TECH
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