CN204462525U - A kind of without CaF 210 × long working distance excluding plan apochromatic metallographic microobjective - Google Patents
A kind of without CaF 210 × long working distance excluding plan apochromatic metallographic microobjective Download PDFInfo
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- CN204462525U CN204462525U CN201420869116.4U CN201420869116U CN204462525U CN 204462525 U CN204462525 U CN 204462525U CN 201420869116 U CN201420869116 U CN 201420869116U CN 204462525 U CN204462525 U CN 204462525U
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Abstract
The utility model discloses a kind of without CaF
210 × long working distance excluding plan apochromatic metallographic microobjective, by 8 not containing CaF
2the convex lens of optical glass and concavees lens be divided into 5 light groups and form, each lens and object plane central coaxial, put in order from left to right as first convex lens, second concave lens, the 3rd concavees lens, the 4th concavees lens, the 5th convex lens, the 6th concavees lens, the 7th concavees lens, the 8th convex lens, object plane.Object plane is imaged on unlimited distance after system.The operating distance W.D=17.53mm of this microcobjective, enlargement ratio β=10 × (when coordinating with f '=200mm tube lens), focal distance f '=20mm, numerical aperture NA=0.28, aperture angle ω=3.15 ° (image space φ 22mm).Its advantage is: 1. not containing CaF
2in times metallography microscope object lens, reach flat field apochromatism effect; 2. Large visual angle, long reach; 3. cost performance is high; 4. parfocalization distance is 60mm.
Description
Technical field
The utility model relates to microcobjective, particularly a kind of without CaF
210 × long working distance excluding plan apochromatic metallographic microobjective.
Background technology
Microcobjective is the most important parts of metaloscope, and the height of its image quality directly affects the performance of metaloscope.Flat field apochromatic micro objective is as best in quality, that class is the highest microcobjective.For to correct elementary axial chromatic aberration and second order spectrum simultaneously in object lens, conventional way is in part positive lens, introduce the optical crystal of low-refraction, low dispersion; But this special optical material yield is few, more crisp, physicochemical property is unstable, large-sized material is more difficult to obtain.Same kind of products at abroad Germany Lycra object lens are made up of 7 lens, and Olympus object lens are made up of 6 lens, wherein all have employed CaF
2material, therefore price is higher, and this two object lens operating distance is also short.In recent years, use special glass (as TF
3) substitute or partly substitute CaF
2manufacture and design flat field apochromatic objective, show superiority reducing costs and improve in manufacturability.This has caused inventor and has in depth studied further this, finally designs a kind of without CaF
210 × long working distance excluding plan apochromatic metallographic microobjective.It is worthy of note, along with the continuous expansion of modern metaloscope in industrial circle range of application, require that the operating distance of metallography microscope object lens is more and more longer, cause its structure complicated all the more, traditional parfocalization can not meet the demands apart from the object lens for 45mm.So USSR (Union of Soviet Socialist Republics) and Japanese Nikon use long parfocalization apart from structure to long reach object lens.As Nikon have employed the parfocalization distance of 60mm, 100 × object lens operating distance is made to reach 1mm.The design, as the low power objective of complete long reach object lens, also uses 60mm parfocalization distance.Certainly, long parfocalization brings new challenge apart from structure to objective lens design and manufacture and obtains the opportunity of innovation achievement.
Utility model content
The purpose of this utility model be to provide a kind of high performance-price ratio without CaF
210 × long working distance excluding plan apochromatic metallographic microobjective, can correct C light (656.3nm), the elementary aberration of axis of F light (486.1nm) and the second order spectrum of D light (589.3nm) simultaneously.
The utility model is by suitable focal length convergent-divergent and aberration optimization, finally obtain picture element excellent in times long working distance flat field apochromatic micro objective.
This nothing CaF
210 × long working distance excluding plan apochromatic metallographic microobjective, by 8 not containing CaF
2the convex lens of optical glass and concavees lens be divided into 5 light groups and form, each lens and object plane central coaxial, put in order from left to right as first convex lens, second concave lens, the 3rd concavees lens, the 4th concavees lens, the 5th convex lens, the 6th concavees lens, the 7th concavees lens, the 8th convex lens, object plane.Object plane is imaged on unlimited distance after system.Distance from the summit of the 8th convex lens to object plane is operating distance W.D.
In described 5 light groups, the 1st light group is first convex lens; 2nd light group is the two gummed groups be made up of second concave lens and the 3rd concavees lens; 3rd light group is the two gummed groups be made up of the 4th concavees lens and the 5th convex lens; 4th light group is the 6th concavees lens; 5th light group is two gummed groups of the 7th concavees lens and the 8th convex lens composition.The spacing of the 8th its sphere top of convex lens and object plane is 17.53mm;
Described first convex lens are thick bent moon monolithic;
Described 6th concavees lens are thin bent moon monolithic;
Described 8th convex lens are aplanatic thick bent moon;
Between each light group, spacing is: between the 2nd light group to the 5th light group, spacing is all less, is 0.1-0.7mm; Wherein: the 1st light group and the 2nd light group are spaces far away, are 9.35mm.
Operating distance W.D=17.53mm of the present utility model;
Enlargement ratio β=10 × (when coordinating with f '=200mm tube lens);
Numerical aperture NA=0.28;
Aperture angle ω=3.15 ° (image space φ 22mm);
Focal distance f '=20mm;
Parfocalization distance=60mm.
The utility model has the advantages that:
(1) not containing CaF
2in times metallography microscope object lens, reach flat field apochromatism effect;
(2) Large visual angle, long reach;
(3) full photonic glass is formed, and cost performance is high;
(4) parfocalization distance.
Accompanying drawing explanation
Fig. 1 is Lycra 10 × flat field apochromatic micro objective structural representation;
Fig. 2 is Olympus 10 × flat field apochromatic micro objective structural representation;
Fig. 3 is the utility model microcobjective structural representation;
Fig. 4 is geometrical aberration curve map of the present utility model;
Fig. 5 is optical transfer function MTF curve map of the present utility model;
In figure: 1. first convex lens 2. second concavees lens 3. the 3rd concavees lens 4. the 4th concavees lens 5. the 5th convex lens 6. the 6th concavees lens 7. the 7th concavees lens 8. the 8th convex lens 9. object plane.
Embodiment
Below in conjunction with accompanying drawing, the utility model is done to the elaboration of a step.
As shown in Figure 3, the utility model is without CaF
210 × long working distance excluding plan apochromatic metallographic microobjective, by 8 not containing CaF
2the convex lens of optical glass and concavees lens compositions, put in order from left to right as first convex lens (1), second concave lens (2), the 3rd concave lens (3), the 4th concave lens (4), the 5th convex lens (5), the 6th concave lens (6), the 7th concave lens (7), the 8th convex lens (8) and object plane (9).And each lens and object plane central coaxial, object plane is imaged on unlimited distance after said system.
The objective lens design Aberration Analysis that the utility model provides is shown in Fig. 4, and reflect that C, D, F light intersects on 0.707 aperture band intuitively, the spherochromatism of three kinds of wavelength is very little, fullys meet apochromatic requirement; Geometrical aberration data show a three rank thatch ten thousand curvature of field (PTZ3)=-0.003605, flat field effect is quite satisfaction also, see from Fig. 5, represent 5 MTF curves of 0 ω, 0.707 ω (ts) and 1 ω (ts) three visual fields, close to each other, reflect the image quality of homogenising in whole visual field; According to visual limiting resolution formula σ=0.61 λ/NA, N=1/ σ=NA/0.61 λ, then N
max=780lp/mm, and now mtf value 0 ω is 0.0884,0.707 ω
twith 0.707 ω
sbe respectively 0.0751 and 0.0539; 1 ω
twith 1 ω
sbe respectively 0.0521 and 0.0403, picture element is gratifying.From comparability, except numerical aperture is more smaller than Nikon, all the other performances and Nikon maintain an equal level; And be better than Lycra camera lens similar with Olympus.
Claims (7)
1. one kind without CaF
210 × long working distance excluding plan apochromatic metallographic microobjective, comprises lens, it is characterized in that: by 8 not containing CaF
2the convex lens of optical glass and concavees lens be divided into 5 light groups and form, each lens and object plane central coaxial, put in order as first convex lens, second concave lens, the 3rd concavees lens, the 4th concavees lens, the 5th convex lens, the 6th concavees lens, the 7th concavees lens, the 8th convex lens, object plane from left to right, object plane is imaged on infinite point after system, and the distance from the summit of the 8th convex lens to object plane is operating distance W.D.
2. microcobjective according to claim 1, is characterized in that: in described 5 light groups, the 1st light group is first convex lens; 2nd light group is the two gummed groups be made up of second concave lens and the 3rd concavees lens; 3rd light group is the two gummed groups be made up of the 4th concavees lens and the 5th convex lens; 4th light group is the 6th concavees lens; 5th light group is two gummed groups of the 7th concavees lens and the 8th convex lens composition.
3. microcobjective according to claim 2, is characterized in that: described first convex lens are thick bent moon monolithic;
4. microcobjective according to claim 2, is characterized in that: described 6th concavees lens are thin bent moon monolithic;
5. microcobjective according to claim 2, is characterized in that: described 8th convex lens are aplanatic thick bent moon;
6. microcobjective according to claim 2, is characterized in that: the spacing of described 8th its sphere top of convex lens and object plane is 17.53mm.
7. microcobjective according to claim 1, is characterized in that: the long reach W.D.=17.53mm of these object lens, enlargement ratio β=10 × and, focal distance f ' and=20mm, numerical aperture NA=0.28, aperture angle ω=3.15 °; Parfocalization distance=60mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420869116.4U CN204462525U (en) | 2014-12-31 | 2014-12-31 | A kind of without CaF 210 × long working distance excluding plan apochromatic metallographic microobjective |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420869116.4U CN204462525U (en) | 2014-12-31 | 2014-12-31 | A kind of without CaF 210 × long working distance excluding plan apochromatic metallographic microobjective |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204462525U true CN204462525U (en) | 2015-07-08 |
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ID=53669390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420869116.4U Expired - Fee Related CN204462525U (en) | 2014-12-31 | 2014-12-31 | A kind of without CaF 210 × long working distance excluding plan apochromatic metallographic microobjective |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204462525U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570309A (en) * | 2014-12-31 | 2015-04-29 | 广西师范大学 | Long-work-distance flat-field apochromatic metallographic microscope objective with magnification power being 10 and without CaF2 |
-
2014
- 2014-12-31 CN CN201420869116.4U patent/CN204462525U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570309A (en) * | 2014-12-31 | 2015-04-29 | 广西师范大学 | Long-work-distance flat-field apochromatic metallographic microscope objective with magnification power being 10 and without CaF2 |
| CN104570309B (en) * | 2014-12-31 | 2018-02-02 | 广西师范大学 | One kind is without CaF210 × long working distance excluding plan apochromatic metallographic microobjective |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20151231 |
|
| EXPY | Termination of patent right or utility model |