CN202171681U

CN202171681U - 100x Flat field apochromatic metallographic microscope objective without CaF2

Info

Publication number: CN202171681U
Application number: CN2011201768265U
Authority: CN
Inventors: 萧泽新; 王民强
Original assignee: Guilin University of Electronic Technology
Current assignee: Guilin University of Electronic Technology
Priority date: 2011-05-26
Filing date: 2011-05-26
Publication date: 2012-03-21
Anticipated expiration: 2021-05-26

Abstract

The utility model discloses a100x Flat field apochromatic metallographic microscope objective without CaF2. The microscope objective comprises lenses and is characterized in that the microscope objective is composed of eight lenses which are arranged coaxially and divided into three optical groups, the lenses are a first convex lens, a first concave lens, a second concave lens, a second convex lens, a third concave lens, a third convex lens, a fourth convex lens and a thick aplanatic meniscus lens which are connected in sequence and do not contain CaF2. Compared with similar domestic and oversea lenses, the microscope objective has the advantages of smaller number of lenses, simpler structure and fitting and adjusting technology, lower cost, high cost performance and the like, besides, the microscope objective provided by the utility model does not contain the CaF2, all performance indexes of the microscope objective are better than the existing similar microscope objectives containing the CaF2 and made of TF3 special glass, so that the microscope objective has broad application prospect and good commercial value.

Description

A kind of 100 * no CaF 2Flat field apochromatism metallography microscope object lens

Technical field

The utility model relates to the metallography microscope endoscope objective lens, and particularly the eyeglass number is less, no CaF ₂100 * 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, and flat field apochromatism metallography microscope object lens are microcobjectives that image quality is good, class is higher.And to obtain superior in quality pixel, and will in object lens, proofread and correct axial chromatic aberration and second order spectrum simultaneously, accomplish this point, conventional way is in the part positive lens, to introduce the optical crystal of low-refraction, low chromatic dispersion, like calcium fluoride (CaF ₂) wait as dielectric material, but this kind texture material is more crisp, moisture-sensitive, physicochemical property unstable, and large-sized material is difficult to obtain, and also makes the process for making of apochromatic objective complicated after introducing this optical crystal, causes cost to increase greatly.Consider these factors, in recent years, the someone uses special glass (like TF3) to substitute or the alternative CaF that contains of part ₂Glass designs and produces the flat field apochromatic objective, and this has shown superiority aspect manufacturability reducing cost and improve, but this special optical glass is expensive, therefore more difficult wide popularization and application.

King Zhijiang River chief editor's " practical optics technical manual " (2006, Beijing: mention a kind of domestic similar 100 * no CaF China Machine Press) ₂Flat field apochromatism oil immersion microcobjective, it is made up of 14 lens, and it is complicated that it debugs technology, and wherein to have used low-refraction, expensive FK be glass to 7 lens, and cost is quite high, and the operating distance of object lens 0.36mm only.

In " microscopical optical design and calculating " (nineteen eighty-two, Beijing that the B.A. Pa Nuofu of the USSR (Union of Soviet Socialist Republics) is shown; China Machine Press) mention two 100 * flat field apochromatic micro objective in the book, these two object lens have adopted 13 and 11 lens respectively, and wherein, it is CaF that the part lens material is arranged ₂Structure (like Fig. 7, Fig. 8).Contain CaF owing to adopt ₂Made and eyeglass number are still more, therefore also have the relative problem of higher of cost.

Summary of the invention

The technical matters that the utility model will solve is to provide that a kind of eyeglass number is few, structure is simple, no CaF ₂100 * flat field apochromatism metallography microscope object lens of made; This object lens can be proofreaied and correct the axial elementary aberration of C light, F light and the second order spectrum of d light simultaneously with less eyeglass number; Thereby obtain very high image quality; And the operating distance of object lens and object plane can reach 1mm, can improve and solve the too short problem of operating distance that existing high power microcobjective exists preferably.

The utility model is realized through following know-why: according to combined light focal power formula φ=φ ₁+ φ ₂- D φ ₁ φ ₂( φ _1, φ ₂Be respectively light group 1,2 focal powers, dBe the distance between first interarea of second interarea of light group 1 and light group 2) can confirm positive and negative group and far separate the flat field apochromatic micro objective of the long reach of " counter take the photograph far away " type; Thus structural shape select close structure camera lens as initial configuration; Through the suitable focal length convergent-divergent and the optimal design of aberration, finally obtain the good 100 * flat field apochromatism metallography microscope object lens of picture element then.

According to above-mentioned principle, in 100 * flat field apochromatism metallography microscope object lens of design the utility model, adopted no CaF ₂Optical glass having high refractive index; Using existing a kind of flat field semi-apochromat group is initial configuration; Use OSLO optical design CAD software; The index of refraction in lens) through the focal length convergent-divergent, (r: lens radius, d: lens curvature thickness, n: textural element such as makes object lens reach apochromatic each item index of flat field and requirement to optimize r that number of lenses and lens are set, d, n.Its concrete technical scheme is following:

A kind of 100 * flat field apochromatism metallography microscope object lens; Comprise lens; Different with prior art is: it is divided into three light groups by 8 lens of arranged in co-axial alignment and forms; Said lens are first convex lens, first concavees lens, second concavees lens, second convex lens, the 3rd concavees lens, the 3rd convex lens, the 4th convex lens and the aplanatic thick meniscus lens that is linked in sequence, and said lens does not contain CaF ₂

In said three light groups, light group one is made up of first convex lens and first concavees lens of two gummeds; Light group two is two groups of cemented doublet groups, and wherein one group is second concavees lens and second convex lens of two gummeds, and another group is two gummed the 3rd concavees lens and the 3rd convex lens; Light group three is combined to form by the 4th convex lens and aplanatic thick meniscus lens; Object plane is imaged on the infinity image planes after the said lens system.

The characteristics of the utility model are based on optical system apochromatism principle; Use optical design software to carry out 100 * flat field apochromatism metallography microscope objective lens design; Through the optimal combination of optical system, the parameters size of design lens combination makes the image quality of object lens reach best requirement.The advantage of this object lens is that its number of lenses lacks than the object lens of existing similar design both at home and abroad, and lens do not contain CaF ₂, structure is with to debug technology simpler, cost is lower, cost performance is higher, can be used for alternative cost higher contain CaF ₂With the microcobjective that uses TF3 special glass to make, shown in Fig. 2-6, therefore have broad application prospects and commercial value.Therefore have broad application prospects and commercial value, its imaging data is shown in table 1, table 2.

Table 1: the MTF curve of the utility model microcobjective and the mtf value of each visual field under the limiting resolution

Table 2: the aberration data table of the utility model microcobjective

Figure DEST_PATH_216702DEST_PATH_IMAGE002

Description of drawings

Fig. 1 is 100 * flat field apochromatism metallography microscope objective lens arrangement synoptic diagram of the utility model;

Fig. 2 is the geometrical aberration evaluation map of the utility model microcobjective;

Fig. 3 is the point spread function figure of the utility model microcobjective;

Fig. 4 is the domestic similar object lens of identical multiple;

Fig. 5 is the aberration curve figure of domestic similar object lens;

Fig. 6 is the MTF curve map of domestic similar object lens;

Fig. 7 by the B.A. Pa Nuofu of the USSR (Union of Soviet Socialist Republics) the 100X flat field apochromatic micro objective synoptic diagram of 13 lens arrangements of employing of mentioning in work " microscopical optical design and the calculating " book;

Fig. 8 by the B.A. Pa Nuofu of the USSR (Union of Soviet Socialist Republics) the 100X flat field apochromatic micro objective synoptic diagram of 11 lens arrangements of employing of mentioning in work " microscopical optical design and the calculating " book.

Embodiment

Below in conjunction with accompanying drawing the utility model is done further detailed description.

According to the utility model 100 * flat field apochromatism metallography microscope object lens illustrated in fig. 1; It by variant 7 meniscuses such as mirror shape, radius-of-curvature and 1 aplanatic thick meniscus lens 9 totally 8 eyeglasses form; Its structure is divided into separation three light groups far away; In order, the light group one that is in the imaging end is made up of first convex lens 2 and first concavees lens 3 of two gummeds; Light group two is the cemented doublet group of two groups of close together, and wherein one group is second concavees lens 4 and second convex lens 5 of two gummeds, and another group is the 3rd concavees lens 6 and the 3rd convex lens 7 of two gummeds; Light group three is combined to form with aplanatic thick meniscus lens 9 by the 4th convex lens 8; Each lens of these three light groups are coaxial with object plane 10 centers, and it constitutes 100 * flat field apochromatic micro objective, and object plane 10 is imaged on infinity image planes 1 after the said lens system.

In Fig. 1; Between light group one and light group two and light group two and the light group three certain spacing is arranged; In light group two; Between the 3rd concavees lens 6 of second concavees lens 4 of two gummeds, second convex lens 5 and two gummeds, the 3rd convex lens 7 a very little spacing is arranged also, aplanatic thick meniscus lens 9 its sphere tops of light group three front ends and the spacing of object plane 10 are 1mm.

The said lens material of the utility model is no CaF ₂Glass of high refractive index, its numerical aperture of the objective system that is constituted

Be 0.9; Aperture angle: 2.3 °; Focal length: 2.5mm; Workplace is apart from W.D=1mm.

Claims

1. one kind 100 * no CaF ₂Flat field apochromatism metallography microscope object lens; Comprise lens; It is characterized in that: be divided into three light groups by 8 lens of arranged in co-axial alignment and form; Said lens are first convex lens (2), first concavees lens (3), second concavees lens (4), second convex lens (5), the 3rd concavees lens (6), the 3rd convex lens (7), the 4th convex lens (8) and the aplanatic thick meniscus lens (9) that is linked in sequence, and said lens does not contain CaF ₂

2. microcobjective according to claim 1 is characterized in that: in said three light groups, light group one is made up of first convex lens (2) and first concavees lens (3) of two gummeds; Light group two is two groups of cemented doublet groups, and wherein one group is second concavees lens (4) and second convex lens (5) of two gummeds, and another group is two gummed the 3rd concavees lens (6) and the 3rd convex lens (7); Light group three is combined to form by the 4th convex lens (8) and aplanatic thick meniscus lens (9); Object plane (10) is imaged on infinity image planes (1) after the said lens system.

3. microcobjective according to claim 2; It is characterized in that: between light group one and light group two and light group two and the light group three certain spacing is arranged; In light group two; Between the 3rd concavees lens (6) of second concavees lens (4) of two gummeds, second convex lens (5) and two gummeds, the 3rd convex lens (7) a very little spacing is arranged also, its sphere top of aplanatic thick meniscus lens (9) of light group three front ends and the spacing of object plane (10) are 1mm.

4. microcobjective according to claim 1 is characterized in that: its numerical aperture of the objective system that said lens constituted is 0.9; Aperture angle: 2.3 ^oFocal length: 2.5mm; Workplace is apart from W.D=1mm.