CN102023378B - CaF2-free low power flat field apochromatic metallographic microobjective - Google Patents
CaF2-free low power flat field apochromatic metallographic microobjective Download PDFInfo
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- CN102023378B CN102023378B CN2010105798594A CN201010579859A CN102023378B CN 102023378 B CN102023378 B CN 102023378B CN 2010105798594 A CN2010105798594 A CN 2010105798594A CN 201010579859 A CN201010579859 A CN 201010579859A CN 102023378 B CN102023378 B CN 102023378B
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- lens
- low power
- flat field
- caf2
- microobjective
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Abstract
The invention provides a CaF2-free low power flat field apochromatic metallographic microobjective, comprising lenses. The microobjective is characterized by comprising three lenses, namely a first plus lens, a second minus lens and a third plus lens, and the three lenses are coaxial. The first plus lens, the second minus lens, the third plus lens and an object plane are arranged in sequence from left to right, and the imaging is formed at infinity in opposite direction. The CaF2-free low power metallographic microobjective has the advantages of achieving the effect of flat field apochromatism, and having long operating distance, high cost performance and simple structure.
Description
Technical field
The present invention relates to microcobjective, particularly a kind of no CaF
2Low power flat field apochromatism metallography microscope object lens.
Background technology
Microcobjective is the important composition parts of metaloscope, and the height of its image quality directly influences the performance of metaloscope.The flat field apochromatic micro objective is the microcobjective that picture element is best, class is the highest.For proofreading and correct axial chromatic aberration and second order spectrum simultaneously, conventional way is in the part positive lens, to introduce optical crystal, like calcium fluoride CaF in object lens
2Deng as manufactured materials.In recent years, the someone uses special glass (like TF
3) substitute or partly alternative CaF
2Manufacture and design the flat field apochromatic objective, shown superiority aspect the manufacturability reducing cost and improve, but the special optical material is few, more crisp, physicochemical property is unstable, and large-sized material more is difficult to obtain.External like product Germany Lay thatch object lens are made up of 5 lens, Japanese Olympus by 7 thoroughly sheet forms, and all adopted and contained CaF
2Material.
Summary of the invention
The objective of the invention is to provide a kind of no CaF
2Low power flat field apochromatism metallography microscope object lens, this microcobjective has high performance-price ratio, and is simple in structure.
The object of the invention realizes through following technical scheme:
The present invention does not have CaF
2It is prototype structure that low power flat field apochromatism metallography microscope object lens separate photographic lens with three, uses OSLO optical design CAD software, through the focal length convergent-divergent, optimizes r, d, and n (r is a spherical radius, and d is a thickness, and n is a refractive index) textural element has been designed no CaF
2Low power flat field apochromatism metallography microscope object lens.These object lens are by first positive lens, and second negative lens, the 3rd positive lens totally three lens are formed, and three lens are coaxial, and from left to right putting in order is first positive lens → second negative lens → 3rd positive lens → object plane, its
Operating distance W.D＞30mm;
Enlargement ratio β=4 *-6.3 *;
Numerical aperture >=0.1; Aperture angle＞2 °;
Focal distance f '=38-65mm.
Described lens are not for containing CaF
2The ordinary optical glass material.
The present invention does not have CaF
2Low power flat field apochromatism metallography microscope object lens show through geometrical aberration evaluation and PTZ3 tables of data contrast test; Reflecting intuitively that d, F, c light are with at 0.707 ω intersects at a point; The spherochromatism of three kinds of wavelength is also less; The flat field effect is also quite satisfied: a thatch ten thousand curvature of field (PTZ3)=-0.003558, visible is a quite outstanding optical texture.
Advantage of the present invention is:
1, do not contain CaF2 low power metallography microscope object lens, reach flat field apochromatism effect;
2, long reach;
3, cost performance is high;
4, simple in structure.
Description of drawings
Fig. 1 is a microcobjective structural representation of the present invention;
Fig. 2 is the geometrical aberration evaluation map of microcobjective of the present invention;
Fig. 3 is a PTZ3 tables of data of the present invention.
Among the figure: 1. the 3rd positive lens 4. object planes of 2. second negative lenses 3. of first positive lens
Embodiment
With reference to Fig. 1, the present invention does not have CaF
2Low power flat field apochromatism metallography microscope object lens are made up of first positive lens 1, second negative lens 2, the 3rd positive lens 3; First positive lens 1, second negative lens 2, the 3rd positive lens 3 are coaxial; From left to right put in order is 1 → the second negative lens 2 of first positive lens → the 3rd positive lens 3 → object plane 4; Object plane 4 is through 2 → the first positive lenss 1 of 3 → the second negative lenses of the 3rd positive lens, and imaging at infinity.
Lens are not for containing CaF
2The ordinary optical glass material.
The present invention does not have CaF
2Low power flat field apochromatism metallography microscope object lens:
Operating distance W.D＞30mm;
Enlargement ratio β=4 *-6.3 *;
Numerical aperture >=0.1; Aperture angle＞2 °;
Focal distance f '=38-65mm.
Fig. 2 and Fig. 3 reflect intuitively that d, F, c light are with at 0.707 ω and intersect at a point that the spherochromatism of three kinds of wavelength is also less, and the flat field effect is also quite satisfied: a thatch ten thousand curvature of field (PTZ3)=-0.003558, visible is a quite outstanding optical texture.
Claims (1)
1. no CaF
2Low power flat field apochromatism metallography microscope object lens comprise lens, it is characterized in that: these object lens are by three lens coaxial compositions, and from left to right putting in order is first positive lens → second negative lens → 3rd positive lens → object plane, its operating distance W.D＞30mm; Enlargement ratio β=4 *～6.3 *; Numerical aperture>=0.1; Aperture angle＞2 °; Focal distance f '=38～65mm; Described lens are not for containing CaF
2The ordinary optical glass material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105798594A CN102023378B (en) | 2010-12-07 | 2010-12-07 | CaF2-free low power flat field apochromatic metallographic microobjective |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105798594A CN102023378B (en) | 2010-12-07 | 2010-12-07 | CaF2-free low power flat field apochromatic metallographic microobjective |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102023378A CN102023378A (en) | 2011-04-20 |
| CN102023378B true CN102023378B (en) | 2012-11-21 |
Family
ID=43864883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105798594A Expired - Fee Related CN102023378B (en) | 2010-12-07 | 2010-12-07 | CaF2-free low power flat field apochromatic metallographic microobjective |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102023378B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4531815A (en) * | 1982-06-09 | 1985-07-30 | Nippon Kogaku K. K. | Objective lens |
| CN1209561A (en) * | 1997-08-22 | 1999-03-03 | 西安光学测量仪器厂 | Full-plastic wide-angle binocular telescope |
| JP2000039561A (en) * | 1998-07-23 | 2000-02-08 | Nikon Corp | Objective lens for microscope |
| CN201892780U (en) * | 2010-12-07 | 2011-07-06 | 桂林电子科技大学 | CaF2-free low-power plan apochromatic metallographic microscope |
-
2010
- 2010-12-07 CN CN2010105798594A patent/CN102023378B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4531815A (en) * | 1982-06-09 | 1985-07-30 | Nippon Kogaku K. K. | Objective lens |
| CN1209561A (en) * | 1997-08-22 | 1999-03-03 | 西安光学测量仪器厂 | Full-plastic wide-angle binocular telescope |
| JP2000039561A (en) * | 1998-07-23 | 2000-02-08 | Nikon Corp | Objective lens for microscope |
| CN201892780U (en) * | 2010-12-07 | 2011-07-06 | 桂林电子科技大学 | CaF2-free low-power plan apochromatic metallographic microscope |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102023378A (en) | 2011-04-20 |
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Granted publication date: 20121121 Termination date: 20151207 |
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