CN205427289U - A big visual field does not have a super achromat head of caF2 for machine vision detects - Google Patents
A big visual field does not have a super achromat head of caF2 for machine vision detects Download PDFInfo
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Abstract
The utility model discloses a big visual field does not have a super achromat head of caF2 for machine vision detects, super achromat pretext lens and diaphragm face are constituteed, the preceding group of arranging in proper order, middle group and back group are drawn together to lens and diaphragm bread from the object plane to image planes, the distance of preceding group and middle across block is 21.1698 0.5mm, middle group is 14.1420 0.1mm with the distance of back across block, preceding group includes series arrangement's first positive lens, second positive lens and first negative lens, middle group is including series arrangement's third positive lens, second negative lens, fourth positive lens, third negative lens and the 5th positive lens, back group is including fourth negative lens and the 6th positive lens. The utility model discloses have big visual field, high resolution, low distortion and superchromaticity characteristic, no caF2 material reduces manufacturing cost, is applied to machine vision and detects the precision that can promote machine vision by a wide margin and detect.
Description
Technical field
The present invention relates to machine visual detection device in optical image technology, a kind of big visual field for Machine Vision Detection is without CaF2Superchromaticity camera lens.
Background technology
Machine Vision Detection is the detection technique that modern industry is conventional, and it has gathered the multi-door subjects such as optics, precision instrument manufacture, control, Computer Image Processing.In recent years, along with China's industry is integrated, the lifting of intelligence degree, the requirement to the image quality of Machine Vision Detection camera lens is also improving constantly.Traditional Machine Vision Detection camera lens all cannot accomplish the apochromatism in the case of big visual field or superchromaticity design.The existence of axial chromatic aberration seriously limits the raising of lens imaging quality.
Superachromatic principle be the light to 5 wavelength at 0.707 band correcting chromatic aberration, which greatly improves the image quality of camera lens, compared with traditional Machine Vision Detection camera lens, under the conditions of identical use, superchromaticity lens imaging becomes apparent from, and resolution is higher.
Camera lens designed by the Chinese patent of Publication No. CN104808315 has bigger visual field, but does not corrects axial chromatic aberration.
Camera lens designed by the Chinese patent of Publication No. CN103499871 achieves superchromaticity, but its visual field is less, it is impossible to be applicable to Machine Vision Detection.
Summary of the invention
Patent of the present invention aims to overcome that existing Machine Vision Detection camera lens cannot realize the superachromatic requirement of the high-resolution under large viewing field condition, it is provided that a kind of big visual field for Machine Vision Detection is without CaF2Superchromaticity camera lens, this superchromaticity camera lens meets big visual field, high-resolution, low distortion, high picture element requirement.
Realize the technical scheme of patent purpose of the present invention:
A kind of big visual field for Machine Vision Detection is without CaF2Superchromaticity camera lens, is made up of lens and diaphragm face, and described lens and diaphragm face include front group, middle groups and rear group being arranged in order from object plane to image planes；Distance between described front group and middle groups is 21.1698 ± 0.5mm, and the distance between described middle groups and rear group is 14.1420 ± 0.1mm；
Described front group has visual field translation function, including the first plus lens tactic from object plane to image planes, the second plus lens and the first minus lens；
Described middle groups has high-resolution function, including tactic 3rd plus lens, the second minus lens, the 4th plus lens, the 3rd minus lens and the 5th plus lens；
Described rear group has compensation axial chromatic aberration function, including the 4th minus lens and the 6th plus lens.
Described plus lens is respectively provided with positive refractive power.
Described lens surface can be that sphere can also be for aspheric surface.
Described second plus lens and the first minus lens composition one first cemented doublet, the second minus lens and the 4th plus lens composition one second cemented doublet, the 4th minus lens and the 6th plus lens composition one the 3rd cemented doublet, cemented doublet has bigger focal power.
Described rear group also includes that the 5th minus lens, described 5th minus lens are placed between the 5th plus lens and the 4th minus lens.
Described middle groups also includes that a diaphragm face, described diaphragm face are placed between the 4th plus lens and the 3rd minus lens.
The true field of described camera lens is 60mm × 60mm, image space 8mm × 8mm, and full filed image space imaging resolution reaches 280cycles/mm, and thing side's resolution is 10.7 μm.
The operating distance of this camera lens is 240mm, focal distance f '=80mm, relative aperture D/f '=0.325, field angle of object 2 ω=14.25 °；Lens distortion is little, and distortion value is less than the lens in 0.1%, and camera lens all without CaF2Material.
It is 0.4 μm-0.7 μm that described camera lens realizes superachromatic wavelength band.
It is 0.436 μm, 0.474 μm, 0.520 μm, 0.575 μm and five kinds of wavelength of 0.680 μm that described camera lens realizes superachromatic wavelength, remaining position value of chromatism < 3.143E-4.
Described camera lens is in visible spectrum, and the light of any two and wavelengths above is in 0.707 band remnants position value of chromatism | δ 'λ1-δ’λ2| < 5.62E-4, wherein δ 'λ1Represent when wavelength is λ 1, the axial image difference of 0.7 band light；δ’λ2Represent when wavelength is λ 2, the axial image difference of 0.7 band light.
The present invention has a characteristic that
1. the present invention realizes superchromaticity at 0.4 μm-0.7 mu m waveband, and image quality is high；
2. the present invention is in visible spectrum, and the light of any two and wavelengths above is in 0.707 band remnants position value of chromatism | δ 'λ1-δ’λ2| < 5.62E-4 has preferable chromatic aberration correction effect；
3. the high-resolution characteristic under the present invention has big visual field, thing side's resolution is high；
4. the present invention has less distortion, and image objects deformation is little, is beneficial to reduce the error of Machine Vision Detection；
5. the present invention uses without CaF2Material, camera lens low cost of manufacture.
The invention have the benefit that the present invention has big visual field, high-resolution, low distortion and superchromaticity characteristic, without CaF2Material reduces manufacturing cost, is applied to Machine Vision Detection and the precision of Machine Vision Detection can be substantially improved.
Accompanying drawing explanation
Fig. 1 is the index path of camera lens in the embodiment of the present invention 1；
Fig. 2 is the modulation transfer function (MTF) figure of camera lens in the embodiment of the present invention 1；
Fig. 3 is the point range figure of camera lens in the embodiment of the present invention 1；
Fig. 4 is the curvature of field of camera lens and distortion figure in the embodiment of the present invention 1；
Fig. 5 is the longitudinal aberration diagram of camera lens in the embodiment of the present invention 1；
Fig. 6 be in the embodiment of the present invention 1 diffraction ring of camera lens around energy profile；
Fig. 7 is the point spread function figure of camera lens in the embodiment of the present invention 1；
Fig. 8 is the light sector diagram of camera lens in the embodiment of the present invention 1；
Fig. 9 is camera lens longitudinal aberration diagram in visible light in the embodiment of the present invention 1.
Figure 10 is the index path of camera lens in the embodiment of the present invention 2；
Figure 11 is the modulation transfer function (MTF) figure of camera lens in the embodiment of the present invention 2；
Figure 12 is the point range figure of camera lens in the embodiment of the present invention 2；
Figure 13 is the curvature of field of camera lens and distortion figure in the embodiment of the present invention 2；
Figure 14 is the longitudinal aberration diagram of camera lens in the embodiment of the present invention 2；
Figure 15 be in the embodiment of the present invention 2 diffraction ring of camera lens around energy profile；
Figure 16 is the point spread function figure of camera lens in the embodiment of the present invention 2；
Figure 17 is the light sector diagram of camera lens in the embodiment of the present invention 2；
Figure 18 is camera lens longitudinal aberration diagram in visible light in the embodiment of the present invention 2.
Detailed description of the invention
With embodiment, patent of the present invention is further described below in conjunction with the accompanying drawings, but is not the restriction to patent of the present invention.
Embodiment 1
Such as Fig. 1, a kind of big visual field of Machine Vision Detection that is applied to is without CaF2Superchromaticity camera lens, described superchromaticity camera lens is made up of lens and diaphragm face, and described lens and diaphragm face are divided into the front group of G with visual field translation function1, middle groups G of high-resolution imaging function2And compensate rear group of G of axial chromatic aberration function3, described front group G1, middle groups G2G is organized after and3Being arranged in order from object plane to image planes, three groups are respectively provided with positive light coke；Group G before described1With middle groups G2Between distance be 21.1698 ± 0.5mm, middle groups G2With rear group of G3Between distance be 14.1420 ± 0.1mm；
Group G before described1One first cemented doublet is formed including tactic first plus lens L1, the second plus lens L2 and the first minus lens L3, the second plus lens L2 and the first minus lens L3.
Middle groups G2One second cemented doublet is formed including tactic 3rd plus lens L4, the second minus lens L5, the 4th plus lens L6, diaphragm face, the 3rd minus lens L7 and the 5th plus lens L8, the second minus lens L5 and the 4th plus lens L6.
Rear group of G3Forming one the 3rd cemented doublet including the 4th minus lens L9 and the 6th plus lens L10, the 4th minus lens L9 and the 6th plus lens L10, the cemented doublet of composition has bigger focal power.
Used in the present embodiment, lens are spherical lens.
Described superchromaticity camera lens uses three stage structure, and the lens unit of camera lens is without CaF2The lens that material is made.The operating distance of camera lens is 240mm, focal distance f '=80mm, relative aperture D/f '=0.325, field angle of object 2 ω=14.25 °, true field is 60mm × 60mm, and thing side's resolution reaches 10.7 μm, image space 8mm × 8mm, image planes receiving device use 1/2 " CCD industrial camera, image planes visual field is 8mm, pixel dimension 5.4 μ m 5.4 μm.
Use the concrete structure data of embodiment of said structure as shown in the structured data table of table 1 camera lens.Lens L1 comprises surface 1,2, and lens thickness is 12.5000mm, and the distance between lens L1 to lens L2 is 27.9597mm；Lens L2 comprises surface 3,4, and lens thickness is 8.8986mm；Lens L3 comprises surface 4,5, and lens thickness is 6.4382mm, and the distance between lens L3 to lens L4 is 21.1698mm；Lens L4 comprises surface 6,7, and lens thickness is 7.8mm, and the distance between lens L4 to lens L5 is 0.5455mm；Lens L5 comprises surface 8,9, and lens thickness is 6mm；Lens L6 comprises surface 9,10, and lens thickness is 4.6946mm, and the distance between lens L6 to diaphragm face is 22.8790；Diaphragm bread contains surface 11, and the distance between diaphragm face to lens L7 is 0.4974mm；Lens L7 comprises surface 12,13, and projection thickness is 5mm, and the distance between lens L7 to lens L8 is 0.4905mm；Lens L8 comprises surface 14,15, and lens thickness is 6mm, and the distance between lens L8 to lens L9 is 14.142mm；Lens L9 comprises surface 16,17, and lens thickness is 6.8594mm；Lens L10 comprises surface 17,18, and lens thickness is 5.7107mm, and the distance between lens L10 to image planes is 4mm.
Table 1
Aberration curve figure is shown in accompanying drawing.Such as Fig. 2, full filed mtf value reaches 280cycles/mm, close to diffraction limit；RMS speckle radius at maximum field of view is 3.812 μm as seen from Figure 3, less than CCD pixel dimension 5.4 μm；From fig. 4, it can be seen that systematical distortion is little, distortion value < 0.2%；As seen from Figure 5, the light of 0.436 μm, 0.474 μm, 0,520 μm, 0.575 μm and 0.680 mum wavelength converges at a bit substantially at 0.707 band, and system realizes superchromaticity, remaining position value of chromatism < 3.62E-4；6-accompanying drawing 8 understands with reference to the accompanying drawings, and comprehensive aberration, picture element and the illumination of the present embodiment all reach requirement.
The present invention is in visible region, and different wave length light is shown in Table 2 in the spherical aberration of 0.707 band, and chromaticity difference diagram is shown in Fig. 9.Data in table 2 show in 0.4 0.7 μ m wavelength range, and in the range of any wavelength light spherical aberration at 0.707 band is all in-4.02E-4-9.64E-4, the light of the most any two and wavelengths above is in 0.707 band remnants position value of chromatism | δ 'λ1-δ’λ2| < 5.62E-4, wherein δ 'λ1Represent when wavelength is λ 1, the axial image difference of 0.7 band light；δ’λ2Represent when wavelength is λ 2, the axial image difference of 0.7 band light.
In fig .9 this it appears that in 0.4 0.7 μ m wavelength range, the aberration situation of different wave length light.
Table 2
The present embodiment uses three stage structure form, uses 10 eyeglasses, including 3 cemented doublets.
Embodiment 2
The present embodiment provides a kind of increase lens and aspheric alternative applications on the basis of embodiment 1.With reference to Figure 10, a kind of big visual field of Machine Vision Detection that is applied to is without CaF2Superchromaticity camera lens, described superchromaticity camera lens is made up of lens and diaphragm face, and described lens and diaphragm face are divided into the front group of G with visual field translation function1, middle groups G of high-resolution imaging function2And compensate rear group of G of axial chromatic aberration function3, described front group G1, middle groups G2G is organized after and3Being arranged in order from object plane to image planes, three groups are respectively provided with positive light coke；Group G before described1With middle groups G2Between distance be 21.1698 ± 0.5mm, middle groups G2With rear group of G3Between distance be 14.1420 ± 0.1mm；
Group G before described1One first cemented doublet is formed including tactic first plus lens L1, the second plus lens L2 and the first minus lens L3, the second plus lens L2 and the first minus lens L3.
Middle groups G2One second cemented doublet is formed including tactic 3rd plus lens L4, the second minus lens L5, the 4th plus lens L6, diaphragm face, the 3rd minus lens L7 and the 5th plus lens L8, the second minus lens L5 and the 4th plus lens L6.
In the present embodiment, organize G afterwards3Also include the 5th minus lens L9, organize G the most afterwards3Forming one the 3rd cemented doublet including the 5th minus lens L9, the 4th minus lens L10 and the 6th plus lens L11, the 4th minus lens L10 and the 6th plus lens L11, the cemented doublet of composition has bigger focal power.
Lens the most used can be that spherical lens can also be for non-spherical lens.
Superchromaticity camera lens uses three stage structure, and the lens unit of camera lens is without CaF2The lens that material is made.The operating distance of camera lens is 240mm, focal distance f '=80mm, relative aperture D/f '=0.325, field angle of object 2 ω=14.25 °, true field is 60mm × 60mm, and thing side's resolution reaches 10.7 μm, image space 7.76mm × 7.76mm, image planes receiving device use 1/2 " CCD industrial camera, image planes visual field is 8mm, pixel dimension 5.4 μ m 5.4 μm.
Use the concrete structure data of embodiment of said structure as shown in the structured data table of table 3 camera lens.Lens L1 comprises surface 1,2, and lens thickness is 12.5000mm, and the distance between lens L1 to lens L2 is 27.9597mm；Lens L2 comprises surface 3,4, and lens thickness is 8.8986mm；Lens L3 comprises surface 4,5, and lens thickness is 6.4382mm, and the distance between lens L3 to lens L4 is 21.1698mm；Lens L4 comprises surface 6,7, and lens thickness is 7.8mm, and the distance between lens L4 to lens L5 is 0.5455mm；Lens L5 comprises surface 8,9, and lens thickness is 6mm；Lens L6 comprises surface 9,10, and lens thickness is 4.6946mm, and the distance between lens L6 to diaphragm face is 22.8790；Diaphragm bread contains surface 11, and the distance between diaphragm face to lens L7 is 0.4974mm；Lens L7 comprises surface 12,13, and projection thickness is 5mm, and the distance between lens L7 to lens L8 is 0.4905mm；Lens L8 comprises surface 14,15, and lens thickness is 6mm, and the distance between lens L8 to lens L9 is 14.142mm；Lens L9 comprises surface 16,17, and lens thickness is 0.8589mm；Distance between lens L9 to lens L10 is 0.4973mm；Lens L10 comprises surface 18,19, and lens thickness is 6.8594mm；Lens L11 comprises surface 18,19, and lens thickness is 5.7107mm, and the distance between lens L10 to image planes is 4mm.
Table 3
| Surface | Type | Radius | Distance | Material | Bore |
| Object plane | 240 | 60 | |||
| 1 | Aspheric surface | 251.7904 | 12.5000 | 1.496997,81.61 | 52.4209 |
| 2 | Aspheric surface | -114.4193 | 27.9597 | 51.7364 | |
| 3 | Aspheric surface | 40.3676 | 8.8986 | 1.717360,29.50 | 36.0989 |
| 4 | Standard sphere | 264.7859 | 6.4382 | 1.612718,58.58 | 32.7440 |
| 5 | Aspheric surface | 26.8774 | 21.1698 | 26.5019 | |
| 6 | Aspheric surface | 16.1245 | 7.8000 | 1.456500,90.27 | 18.9221 |
| 7 | Aspheric surface | -224.1536 | 0.5455 | 15.4705 | |
| 8 | Aspheric surface | -162.3337 | 6.0000 | 1.625884,35.70 | 15.0419 |
| 9 | Standard sphere | 6.7810 | 4.6946 | 1.496997,81.61 | 10.3022 |
| 10 | Aspheric surface | 12.8163 | 22.8790 | 8.8605 | |
| 11 | Diaphragm face | 0.4974 | 7.7949 | ||
| 12 | Aspheric surface | 18.3482 | 5.0000 | 1.834813,42.74 | 8.2453 |
| 13 | Aspheric surface | 9.9334 | 0.4905 | 8.5678 | |
| 14 | Aspheric surface | 10.8725 | 6.0000 | 1.456500,90.27 | 9.1117 |
| 15 | Aspheric surface | -14.0906 | 14.1420 | 10.5495 | |
| 16 | Standard sphere | 30.2606 | 0.8589 | 1.456500,90.27 | 12.4650 |
| 17 | Standard sphere | 36.2938 | 0.4973 | 12.4270 | |
| 18 | Aspheric surface | 15.2951 | 6.8594 | 1.612718,58.58 | 12.5474 |
| 19 | Standard sphere | 6.0419 | 5.7107 | 1.717360,29.50 | 10.2267 |
| 20 | Aspheric surface | 10.5135 | 4.0000 | 8.5459 | |
| Image planes | 7.7647 |
In table 3, aspheric surface used can represent by following equation
In formula, Z is the curved surface side-play amount along optical axis, and c is vertex curvature, and r is lens surface half bore, and k is quadratic surface constant, A2、A4、A6It is respectively second order, quadravalence, six level numbers.
Aspheric coefficient is as shown in table 4
Table 4
| Surface | Quadratic surface coefficient k | Coefficient A2 | Coefficient A4 | Coefficient A6 |
| 1 | 15.7643 | 1.3259E-4 | 3.9891E-8 | -2.8457E-10 |
| 2 | 3.1665 | -2.5934E-4 | -3.3933E-7 | 5.2003E-11 |
| 3 | -0.0820 | -2.2195E-4 | -7.7115E-7 | -1.9575E-9 |
| 5 | 0.4368 | 3.5562E-4 | -1.5127E-6 | -9.4351E-9 |
| 6 | 0.1192 | -2.7445E-3 | -2.1903E-5 | 5.8498E-8 |
| 7 | -4163.3171 | 2.3661E-3 | 3.8310E-5 | 5.2649E-7 |
| 8 | -1944.7147 | 4.5540E-3 | 3.5017E-5 | 3.1301E-7 |
| 10 | 1.5427 | -1.9014E-3 | -1.0000E-4 | -2.3629E-6 |
| 12 | 0.9437 | -1.5796E-3 | -4.0176E-5 | -1.1160E-6 |
| 13 | -0.1900 | -1.3705E-4 | -3.1977E-5 | -2.6707E-6 |
| 14 | 0.7833 | 2.8387E-4 | -1.8423E-4 | -3.6122E-6 |
| 15 | 1.3204 | 2.4470E-3 | -3.2983E-5 | 1.4618E-7 |
| 18 | -3.5273 | 5.0161E-3 | 4.7591E-5 | -2.0843E-7 |
| 20 | -0.0703 | 7.3648E-3 | -5.1264E-4 | 1.4618E-6 |
Aberration curve figure is shown in accompanying drawing.Such as Figure 11, full filed mtf value reaches 280cycles/mm, close to diffraction limit；RMS speckle radius at maximum field of view is 0.809 μm as seen from Figure 12, less than CCD pixel dimension 5.4 μm；As seen from Figure 13, systematical distortion is little, distortion value≤0.1%；As seen from Figure 14, the light of 0.436 μm, 0.474 μm, 0,520 μm, 0.575 μm and 0.680 mum wavelength converges at a bit substantially at 0.707 band, and system realizes superchromaticity, remaining position value of chromatism < 3.143E-4；15-accompanying drawing 17 understands with reference to the accompanying drawings, and comprehensive aberration, picture element and the illumination of the present embodiment all reach requirement.
The present invention is in visible region, and different wave length light is shown in Table 5 in the spherical aberration of 0.707 band, and chromaticity difference diagram is shown in Figure 18.Data in table 5 show in 0.4 0.7 μ m wavelength range, and in the range of any wavelength light spherical aberration at 0.707 band is all in 1.28E-3 5.22E-4, the light of the most any two and wavelengths above is in 0.707 band remnants position value of chromatism | δ 'λ1-δ’λ2| < 7.58E-4, wherein δ 'λ1Represent when wavelength is λ 1, the axial image difference of 0.7 band light；δ’λ2Represent when wavelength is λ 2, the axial image difference of 0.7 band light.In figure 18 this it appears that in 0.4 0.7 μ m wavelength range, the aberration situation of different wave length light.
Table 5
The present embodiment uses three stage structure form, uses 11 eyeglasses, including 3 cemented doublets.
The preferred embodiment of the simply present invention described in this specification, above example is only in order to illustrate technical scheme rather than limitation of the present invention.All those skilled in the art, all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. the big visual field being used for Machine Vision Detection is without CaF2Superchromaticity camera lens, it is characterised in that described superchromaticity camera lens is made up of lens and diaphragm face, described lens and diaphragm face include front group, middle groups and rear group being arranged in order from object plane to image planes；Distance between described front group and middle groups is 21.1698 ± 0.5mm, and the distance between described middle groups and rear group is 14.1420 ± 0.1mm；
Described front group includes tactic first plus lens, the second plus lens and the first minus lens；
Described middle groups includes tactic 3rd plus lens, the second minus lens, the 4th plus lens, the 3rd minus lens and the 5th plus lens；
Described rear group includes the 4th minus lens and the 6th plus lens.
2. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that described lens surface is sphere or aspheric surface.
3. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that described second plus lens and the first minus lens composition one first cemented doublet, the second minus lens and the 4th plus lens composition one second cemented doublet, the 4th minus lens and the 6th plus lens composition one the 3rd cemented doublet.
4. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that described rear group also includes that the 5th minus lens, described 5th minus lens are placed between the 5th plus lens and the 4th minus lens.
5. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that described middle groups also includes that a diaphragm face, described diaphragm face are placed between the 4th plus lens and the 3rd minus lens.
6. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that the true field of described camera lens is 60mm × 60mm, image space 8mm × 8mm, full filed image space imaging resolution reaches 280cycles/mm, and thing side's resolution is 10.7 μm.
7. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that described camera lens operating distance is 240mm, focal distance f '=80mm, relative aperture D/f '=0.325, field angle of object 2 ω=14.25 °, distortion value is less than the lens in 0.2%, and camera lens all without CaF2Material.
8. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that it is 0.4 μm-0.7 μm that described camera lens realizes superachromatic wavelength band.
9. the big visual field for Machine Vision Detection as described in claim 1 or 8 is without CaF2Superchromaticity camera lens, it is characterised in that it is 0.436 μm, 0.474 μm, 0.520 μm, 0.575 μm and five kinds of wavelength of 0.680 μm that described camera lens realizes superachromatic wavelength, remaining position value of chromatism < 3.143E-4.
10. the big visual field for Machine Vision Detection as claimed in claim 1 is without CaF2Superchromaticity camera lens, it is characterised in that described camera lens is in visible spectrum, and the light of any two and wavelengths above is in 0.707 band remnants position value of chromatism | δ 'λ1-δ’λ2| < 5.62E-4, wherein δ 'λ1Represent when wavelength is λ 1, the axial image difference of 0.7 band light；δ’λ2Represent when wavelength is λ 2, the axial image difference of 0.7 band light.
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| CN105403980A (en) * | 2015-12-15 | 2016-03-16 | 桂林电子科技大学 | Large-view-field CaF2-free superachromatic lens for machine visual detection |
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| CN105403980A (en) * | 2015-12-15 | 2016-03-16 | 桂林电子科技大学 | Large-view-field CaF2-free superachromatic lens for machine visual detection |
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