CN104330867A - Large-aperture small-F-number optical system used for television wave band - Google Patents
Large-aperture small-F-number optical system used for television wave band Download PDFInfo
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- CN104330867A CN104330867A CN201310305963.8A CN201310305963A CN104330867A CN 104330867 A CN104330867 A CN 104330867A CN 201310305963 A CN201310305963 A CN 201310305963A CN 104330867 A CN104330867 A CN 104330867A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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Abstract
The invention provides a large-aperture small-F-number optical system used for television waveband and is to provide an optical structure which has relatively good imaging quality when the television waveband is 500nm-850 nm, the aperture is 300 mm, and the F-number, which is the ratio of focal length and the aperture, is 0.833. The optical system is realized through the following technical scheme: an evolved reverse telephoto structure is adopted, and a front lens group I, of which the focal power is negative, forms converged light through a compressing aperture of a first positive meniscus lens; a first concave surface negative lens corrects the aberration of the first positive meniscus lens and scatters the converged light, thereby reducing visual field angle of a back lens group II of which the focal power is positive; the divergent beams obtained after passing through an aperture reduce aberration through a first negative crescent lens of a three-separation objective lens group II A, enter a first double-convex positive lens to reduce divergence angle, form converged light beams through a second convex positive lens, and are further converged through a double-separation lens group II B; and residual aberration is corrected through a second negative crescent lens and a fourth positive crescent lens of a field lens group II C, and the light is imaged to a focal plane.
Description
Technical field
The present invention relates to one and be mainly used in 500nm ~ 850nm TV wave band, bore 300mm, focal length 250mm, visual field is ± 8 °, the little F number optical system of F number 0.833.
Background technology
The camera lens of existing TV wave band, spectral range is generally 486nm ~ 656nm, and focal length and bore ratio and F number are generally more than 1; And being subject to detector size restriction, the visual field of long-focal distance optical system is less, and the focal length of large visual field optical system is shorter.But for the optics of particular/special requirement or In Astro-optical Systems, need wider detecting band scope, larger bore, and meet the requirement of Large visual angle long-focus simultaneously, what is more important, bigbore lens require that optical material adopts low price, and the common optical glass easily manufactured and spherical surface shape, to reduce costs.
US Patent No. 4136931A describes a kind of optical system with wide field of view, but F number is 1.27, focal length 100mm, and field angle ± 30 °, within wavelength band is limited in 486nm ~ 656nm, and have employed aspheric surface.
US Patent No. 7733581B2 describes 12 kinds of optical system with wide field of view, but relative aperture is all more than 1, or have employed aspheric surface, or have employed fluorite CaF2 crystalline material, and focal length is no more than 100mm.
It is 100mm, F number is 1.45 that US Patent No. 4806003A describes a kind of bore, and focal length is 100mm, and visual field is the optical system of ± 32 °, but within wavelength band is limited in 486nm ~ 656nm, and have employed aspheric surface.
Summary of the invention
The object of the invention is the weak point existed for above-mentioned prior art, there is provided a kind of illuminance of image plane even, optics vignetting can be reduced, and can at 500nm ~ 850nm TV wave band, visual field is ± 8 °, focal length is 250mm bore still has the optical system of better image quality when being 300mm, F number 0.833.
In order to realize foregoing invention object, a kind of heavy caliber for TV wave band provided by the invention little F number optical system, comprise: adopt develop counter to take the photograph structure far away, be divided into optical system focal power to be negative front lens group I and focal power being the diaphragm 4 of positive rear lens group II, it is characterized in that, it is that negative front lens group I is made up of the first bent moon positive lens 2 and the first concave surface negative lens 3 that differentiation counter takes the photograph focal power in structure far away; Develop counter to take the photograph focal power in structure far away be positive rear lens group II is hereby ten thousand lens combination of a distortion, be made up of lens combination II A, air-spaced doublet group II B and field lens group II C; Focal power is negative front lens group I system, converged light is formed by the first bent moon positive lens (2) compression bore, first concave surface negative lens (3) corrects the aberration that the first bent moon positive lens (2) causes, and converged light is dispersed, to reduce the angle between the incident light of different visual fields, make it greatly to reduce with the pitch angle of optical axis, focal power between diaphragm 4 to focal plane 12 is made to be positive rear lens group II, namely the field angle of the first bent moon negative lens the 5 ~ four bent moon positive lens 11 correspondence reduces, and is convenient to aberration correction; Divergent beams through diaphragm 4 reduce aberration by the first bent moon negative lens 5 that three are separated objective lens II A, enter the first biconvex positive lens 6 and reduce the angle of divergence, converging beam is formed again by the second convex surface positive lens 7, the focal power of system is increased through the secondth bent moon positive lens 8 of air-spaced doublet group II B and the 3rd bent moon positive lens 9, and further elimination system total color difference, then be imaged onto focal plane 12 through the second bent moon negative lens 10 of field lens group II C and the 4th bent moon positive lens 11 correct residual aberration.
The present invention has following beneficial effect compared to prior art:
The present invention all have employed normal optical glass and spherical lens, does not adopt the expensive material such as fluorite and is difficult to process the aspheric surface detected.The positive negative power of the lanthanum flint glass LAF5 material adopted, lanthanum crown glass HLAK52 material and HLAK4L material and dense flint glass HZF50 material and HZF72A material is matched and assembled arrangement form can meet the wide television waves segment limit of 500nm ~ 850nm, bore is 300mm, visual field is ± 8 ° and F number is the optical system structure of 0.833, and in full filed, root mean square (RMS) the value size of disc of confusion is no more than 20 microns.
The present invention adopts the counter of differentiation to take the photograph structure far away, be that negative front lens group I is dispersed from the directional light of the different visual fields that infinite distance object plane sends by the focal power object plane 1 to diaphragm 4, the angle between the incident light of different visual fields can be reduced, make it greatly to reduce with the pitch angle of optical axis, focal power between diaphragm 4 to focal plane 12 is made to be positive rear lens group II, namely the field angle of the first bent moon negative lens the 5 ~ four bent moon positive lens 11 correspondence reduces, and is convenient to aberration correction; Based on above principle, its field angle of image significantly reduces than field angle of object, and simultaneously as far as possible by forward for diaphragm 4 placement, obtain less coefficient of vignetting at the maximum caliber reducing optical system, therefore illuminance of image plane is even, and maximum coefficient of vignetting is no more than 11% simultaneously.
The present invention adopts the first bent moon positive lens 2 of LAF5 material, converges, the infinite distance directional light from object plane 1 incidence to reduce the bore of its rear optical system; The aberration that the first bent moon positive lens 2 that first concave surface negative lens 3 of HZF50 material corrects LAF5 material causes and part primary aberration, and by the divergence of beam assembled by the first bent moon positive lens 2 to reduce the angle between the incident light of different visual fields, make it greatly to reduce with the pitch angle of optical axis, focal power between diaphragm 4 to focal plane 12 is made to be positive rear lens group II, namely the field angle of the first bent moon negative lens the 5 ~ four bent moon positive lens 11 correspondence reduces, and is convenient to aberration correction.
Rear lens group II is hereby ten thousand lens combination of a distortion, is made up of lens combination II A, air-spaced doublet group II B and field lens group II C.Negative positive three lens combination II A being separated combination are made up of the second convex surface positive lens 7 of the first bent moon negative lens 5 of HZF72A material, the first biconvex positive lens 6 of HLAK52 material and HLAK4L material, there is achromatism ability strong, visual field is large, the features such as F number is little, effectively can reduce the remaining color difference hits through the different visual fields of diaphragm 4 and primary aberration; Because the first bent moon negative lens 5 focal power of HZF72A material is less, the HLAK52 material positive lens that lens combination II A also can be reduced in the less demanding situation of achromatism just combines with two separation of HLAK4L material positive lens.
Air-spaced doublet group II B of two positive lens compositions is made up of the second bent moon positive lens 8 of LAF5 material and the 3rd bent moon positive lens 9 of LAF5 material, increases the focal power of system, and utilizes LAF5 material to eliminate system total color difference further; Field lens group II C to be coordinated with the 4th bent moon positive lens 11 of LAF5 material by the second bent moon negative lens 10 of HZF72A material and forms, to correct the curvature of field, astigmatism and distortion, and reduction system aberration further simultaneously.
The present invention can as the optical system of the purposes such as all kinds of large image planes phtographic lens, monitoring, astronomy, Search/Track aiming.
Accompanying drawing explanation
Fig. 1 is the organigram of a kind of heavy caliber Large visual angle little F number optical system structure for TV wave band of the present invention.
In figure: 1 object plane, 2 first bent moon positive lenss, 3 first concave surface negative lenses, 4 diaphragms, 5 first bent moon negative lenses, 6 first biconvex positive lens, 7 second convex surface positive lenss, 8 second bent moon positive lenss, 9 the 3rd bent moon positive lenss, 10 second bent moon negative lenses, 11 the 4th bent moon positive lenss, 12 focal planes.
Embodiment
Set forth the present invention in order to clear further, will embodiment be provided below and combine with accompanying drawing, the technical program is described, but should not be understood as limitation of the invention.
Consult a kind of heavy caliber Large visual angle little F number optical system for TV wave band described by Fig. 1, comprising: be arranged in order 9 dialyte lenses 2 ~ 3,5 ~ 11 and diaphragm 4 from infinite distance object plane 1 to focal plane 12.Infinite distance parallel input light is from object plane 1, the 4th bent moon positive lens 11 through the second bent moon positive lens 8 of the second convex surface positive lens 7 of the first biconvex positive lens 6 of the first bent moon negative lens 5 of the first concave surface negative lens 3 of the first bent moon positive lens 2 of LAF5 material, HZF50 material, diaphragm 4, HZF72A material, HLAK52 material, HLAK4L material, LAF5 material, the 3rd bent moon positive lens 9 of LAF5 material, the second bent moon negative lens 10 of HZF72A material and LAF5 material is imaged on focal plane 12, completes the overall process of imaging.
The present invention have employed altogether LAF5 material, HZF50 material, HZF72A material, HLAK52 material and HLAK4L material totally five kinds of optical glass combination pairing with color difference eliminating.
During service band 500nm ~ 850nm, the optical performance parameter of selected optical system glass material is as shown in table 1:
Table 1 glass optics properties parameter
| Optical material | Refractive index | Refractive index rank | Abbe number | Abbe number rank |
| LAF5 | 1.7486 | 2 | 29.6 | 3 |
| HZF50 | 1.7337 | 3 | 20.6 | 4 |
| HZF72A | 1.9102 | 1 | 14.3 | 5 |
| HLAK52 | 1.7254 | 4 | 38.5 | 2 |
| HLAK4L | 1.6370 | 5 | 41.8 | 1 |
As table 1, the permutation and combination of above optical material effectively can eliminate second order spectrum and elementary aberration.Wherein HLAK52 material Abbe number (38.5, Abbe number rank the 2nd) and HLAK4L material Abbe number (41.8, Abbe number is ranked first) are more or less the same in table, can share a kind of material; HZF50 material Abbe number (20.6, Abbe number rank the 4th) and HZF72A material Abbe number (14.3 Abbe number rank the 5th) are more or less the same in table, also can share a kind of material.However, the more gradients of change comparing three kinds of combinations of materials at the optical parametric such as refractive index, Abbe number because of the optical system of five kinds of combinations of materials are closeer, optical property especially achromatism performance is better, and thus the present invention has selected the pattern of five kinds of optical material combinations.
For taking into account visual field and vignetting and bore and system overall length, the present embodiment optical system have employed diaphragm as far as possible forward the counter of differentiation take the photograph structure far away, from diaphragm 4 optical system to be divided into the first bent moon positive lens 2 and the first concave surface negative lens 3 to form differentiation counter take the photograph that focal power structure far away is that negative front lens group I, first bent moon negative lens the 5 ~ four bent moon positive lens 11 composition develops counter to take the photograph focal power in structure far away be positive rear lens group II; Wherein rear lens group II divides for again lens combination II A be made up of the first bent moon negative lens 5 ~ the second convex surface positive lens 7, air-spaced doublet group II B is formed by the second bent moon positive lens 8 and the 3rd bent moon positive lens 9, and field lens group II C be made up of the second bent moon negative lens 10 and the 4th bent moon positive lens 11.
Front lens group I is made up of the first bent moon positive lens 2 of LAF5 material and the first concave surface negative lens 3 of HZF50 material.Wherein, the refractive index (1.7486 that lanthanum flint glass LAF5 is moderate, refractive index rank the 2nd) and moderate Abbe number (29.6, Abbe number rank the 3rd) with the moderate refractive index (1.7337 of dense flint glass HZF50, refractive index rank the 3rd) lower Abbe number (20.6, Abbe number rank the 4th) by the cooperation of positive negative power and spacing, elementary aberration can be reduced, and reduce second order spectrum to a certain extent, spherical aberration and coma can also be reduced simultaneously; Wherein, the infinite distance directional light from object plane 1 incidence converges with the bore reducing its rear optical system by the first bent moon positive lens 2 of LAF5 material; The aberration that the first bent moon positive lens 2 that first concave surface negative lens 3 of HZF50 material corrects LAF5 material causes and part primary aberration, and the divergence of beam assembled by the first bent moon positive lens 2 is to reduce the angle between the incident light of different visual fields, make it greatly to reduce with the pitch angle of optical axis, focal power between diaphragm 4 to focal plane 12 is made to be positive rear lens group II, namely the field angle of the first bent moon negative lens the 5 ~ four bent moon positive lens 11 correspondence reduces, and is convenient to aberration correction.
Diaphragm 4 limits the bore of optical system incident beam.
Rear lens group II is hereby ten thousand lens combination of a distortion, is made up of lens combination II A, air-spaced doublet group II B and field lens group II C.Negative positive three lens combination II A being separated combination are made up of the second convex surface positive lens 7 of the first bent moon negative lens 5 of HZF72A material, the first biconvex positive lens 6 of HLAK52 material and HLAK4L material.Wherein, first bent moon negative lens 5 of dense flint glass HZF72A material has maximum refractive index (1.9102, refractive index is ranked first) and minimum Abbe number (14.3 Abbe number rank the 5th), first biconvex positive lens 6 of lanthanum crown glass HLAK52 has moderate refractive index (1.7254, refractive index rank the 4th) and larger Abbe number (38.5, Abbe number rank the 2nd), the second convex surface positive lens 7 of lanthanum crown glass HLAK4L has minimum refractive index (1.6370, refractive index rank the 5th) and maximum Abbe number (41.8, Abbe number is ranked first), as group before hereby ten thousand lens combination of distortion and rear lens group II, there is achromatism ability strong, visual field is large, the features such as F number is little, effectively can reduce the remaining color difference hits through the different visual fields of diaphragm 4 and primary aberration.
Divergent beams through diaphragm 4 continue to disperse to reduce the elementary monochromatic aberrations such as remaining color difference hits, spherical aberration, coma and astigmatism by the first bent moon negative lens 5 of HZF72A material, the first biconvex positive lens 6 entering HLAK52 material again reduces the angle of divergence and reduces edge aberration and partial higher aberration, then forms converging beam by the second convex surface positive lens 7 of HLAK4L material; Because the first bent moon negative lens 5 focal power of HZF72A material is less, the HLAK52 material positive lens that lens combination II A also can be reduced in the less demanding situation of achromatism just combines with two separation of HLAK4L material positive lens.
Air-spaced doublet group II B of two positive lens compositions is made up of the second bent moon positive lens 8 of LAF5 material and the 3rd bent moon positive lens 9 of LAF5 material, its objective is the focal power of increase system, and utilize LAF5 material in service band 500nm ~ 850nm refractive index moderate (1.7486, refractive index rank the 2nd) and the feature of Abbe number moderate (29.6, Abbe number rank the 3rd) eliminate system total color difference further.For reducing the curvature of lens, thickness, spherical aberration and senior aberration, have employed air-spaced doublet i.e. the second bent moon positive lens 8 and the 3rd bent moon positive lens 9 shared focal power of same material.
Field lens group II C to be coordinated with the 4th bent moon positive lens 11 of LAF5 material by the second bent moon negative lens 10 of HZF72A material and forms, to correct the curvature of field, astigmatism and distortion, and reduction system aberration further simultaneously.
The optical glass material of the present embodiment is the conventional trade mark, and lens face shape deflection is all sphere, service band scope 500nm ~ 850nm, field angle ± 8 °, focal length 250mm, entrance pupil bore 300mm, F number is 0.833, and namely focal distance f=250 are F=f/D=0.8333 with the ratio of entrance pupil bore D=300; Be no more than 790mm from the overall length of the first bent moon positive lens 2 near the curved surface summit of object plane 1 to focal plane 12, maximum caliber is no more than 380mm, and maximum coefficient of vignetting is less than 11%, and in full filed, the root mean square RMS value size of disc of confusion is no more than 20 microns.
Wherein, being all lanthanum flint glass reaches more than 1.7 refractive indexes and more than the 28 Abbe number optical glass of other trade mark optical glass as HLAFL5 or HLAF1 or HLAF2 or HLAF3 or HLAF4 or HLAF6 or HLAF7 or HLAF10 or HLAF50 or HLAF52 or HLAF53 or HLAF54 or the material such as HLAF55 or HLAF62 or HLAF72 or HLAF76 at service band 500nm ~ 850nm also can replace LAF5 material as the first bent moon positive lens 2; Being all dense flint glass reaches more than 1.8 refractive indexes and less than the 22 Abbe number optical glass of other trade mark optical glass as HZF7L or HZF12 or HZF13 or ZF14 or the material such as HZF52 or HZF62 or HZF72A or HZF75 at service band 500nm ~ 850nm also can replace HZF50 material as the first concave surface negative lens 3.
Wherein, being all dense flint glass reaches more than 1.8 refractive indexes and less than the 22 Abbe number optical glass of other trade mark optical glass as HZF7L or HZF12 or HZF13 or ZF14 or the material such as HZF50 or HZF52 or HZF62 or HZF75 at service band 500nm ~ 850nm also can replace HZF72A material as the first bent moon negative lens 5; Because the first bent moon negative lens 5 focal power is less, the first bent moon negative lens 5 directly can be removed in the less demanding situation of achromatism.
No matter with or without the first bent moon negative lens 5, reach other trade mark lanthanum crown glasses of more than 1.6 refractive indexes and more than 36 Abbe number as HLAK4L or HLAK50 or HLAK51 or HLAK53 or HLAK54 or HLAK61 at service band 500nm ~ 850nm, and other trade mark dense crowns close to lanthanum crown glass character as HZK7 or HZK9 or etc. the optical glass of material also can replace also replacing HLAK52 material as the first biconvex positive lens 6; Reach other trade mark lanthanum crown glasses of more than 1.6 refractive indexes and more than 36 Abbe number as HLAK50 or HLAK51 or HLAK52 or HLAK53 or HLAK54 or HLAK61 at service band 500nm ~ 850nm, and other trade mark dense crowns close to lanthanum crown glass character as HZK7 or HZK9 or etc. the optical glass of material HLAK4L material also can be replaced as the second convex surface positive lens 7.
Wherein, being all dense flint glass reaches more than 1.8 refractive indexes and less than 20 Abbe number other trade mark optical glass such as optical glass of the materials such as HZF62 or HZF75 at service band 500nm ~ 850nm also can replace HZF72A material as the second bent moon negative lens 10; other trade mark lanthanum flint glasses of more than 1.7 refractive indexes and more than 30 Abbe number are reached as HLAFL5 or HLAF1 or HLAF2 or HLAF3 or HLAF4 or HLAF6 or HLAF7 or HLAF10 or HLAF50 or HLAF52 or HLAF53 or HLAF54 or HLAF55 or HLAF62 or HLAF72 or HLAF76 at service band 500nm ~ 850nm, and the heavy-lanthanide flint glass close with lanthanum flint glass character such as HZLAF1 or HZLAF2 or HZLAF3 or HZLAF4 or HZLAF50 or HZLAF51 or HZLAF52 or HZLAF53 or HZLAF54 or HZLAF55 or HZLAF56 or HZLAF57 or HZLAF60 or HZLAF62 or HZLAF66 or HZLAF68 or HZLAF69 or HZLAF70 or HZLAF71 or HZLAF72 or the material such as HZLAF75 or HZLAF76 or HZLAF78 or HZLAF80 also can replace LAF5 material as the 4th bent moon positive lens 11.
Above-described is only the preferred embodiments of the present invention.It should be pointed out that for the person of ordinary skill of the art, under the premise without departing from the principles of the invention, some distortion and improvement can also be made, such as, the present invention:
First bent moon positive lens 2 of LAF5 material can be replaced by the positive lens of HLAFL5 or HLAF1 or HLAF2 or HLAF3 or HLAF4 or HLAF6 or HLAF7 or HLAF10 or HLAF50 or HLAF52 or HLAF53 or HLAF54 or the material such as HLAF55 or HLAF62 or HLAF72 or HLAF76;
First concave surface negative lens 3 of HZF50 material can be replaced by the negative lens of HZF7L or HZF12 or HZF13 or ZF14 or the material such as HZF52 or HZF62 or HZF72A or HZF75;
First bent moon negative lens 5 of HZF72A material can be replaced by the negative lens of HZF7L or HZF12 or HZF13 or ZF14 or the material such as HZF50 or HZF52 or HZF62 or HZF75; Because the first bent moon negative lens 5 focal power is less, the first bent moon negative lens 5 directly can be removed in the less demanding situation of achromatism;
First biconvex positive lens 6 of HLAK52 material can be replaced by the positive lens of HZK7 or HZK9 or HLAK4L or HLAK50 or the material such as HLAK51 or HLAK53 or HLAK54 or HLAK61;
Second convex surface positive lens 7 of HLAK4L material can be replaced by the positive lens of HZK7 or HZK9 or HLAK50 or HLAK51 or the material such as HLAK52 or HLAK53 or HLAK54 or HLAK61;
Second bent moon negative lens 10 of HZF72A material can be replaced by the negative lens of the materials such as HZF62 or HZF75;
4th bent moon positive lens 11 of LAF5 material can be replaced by the positive lens of HLAFL5 or HLAF1 or HLAF2 or HLAF3 or HLAF4 or HLAF6 or HLAF7 or HLAF10 or HLAF50 or HLAF52 or HLAF53 or HLAF54 or HLAF55 or HLAF62 or HLAF72 or HLAF76 or HZLAF1 or HZLAF2 or HZLAF3 or HZLAF4 or HZLAF50 or HZLAF51 or HZLAF52 or HZLAF53 or HZLAF54 or HZLAF55 or HZLAF56 or HZLAF57 or HZLAF60 or HZLAF62 or HZLAF66 or HZLAF68 or HZLAF69 or HZLAF70 or HZLAF71 or HZLAF72 or the material such as HZLAF75 or HZLAF76 or HZLAF78 or HZLAF80, these change and change and should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the little F of the heavy caliber for a TV wave band number optical system, comprise: the diaphragm (4) being divided into optical system focal power to be negative front lens group I and focal power being positive rear lens group II, it is characterized in that, develop counter is adopted to take the photograph structure far away, focal power is that negative front lens group I is made up of the first bent moon positive lens (2) and the first concave surface negative lens (3), hereby ten thousand lens combination of focal power to be positive rear lens group II a be distortion, are made up of lens combination II A, air-spaced doublet group II B and field lens group II C; Focal power is negative front lens group I, converged light is formed by the first bent moon positive lens (2) compression bore, first concave surface negative lens (3) corrects the aberration that the first bent moon positive lens (2) causes, and converged light is dispersed, with the angle between the different visual fields incident light reducing to enter optical system from object plane (1), reduce the difficulty that focal power is positive rear lens group II aberration correction; The first bent moon negative lens (5) through divergent beams scioptics group II A of diaphragm (4) reduces aberration, enter the first biconvex positive lens (6) again and reduce the angle of divergence, converging beam is formed again by the second convex surface positive lens (7), through the second bent moon positive lens (8) of air-spaced doublet group II B and the focal power of the 3rd bent moon positive lens (9) increase system, and further elimination system total color difference, then be imaged onto focal plane (12) through the second bent moon negative lens (10) of field lens group II C and the 4th bent moon positive lens (11) correct residual aberration.
2. as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, first bent moon positive lens (2) and the first concave surface negative lens (3) composition develop counter take the photograph that focal power in structure far away is that negative front lens group I, first bent moon negative lens (5) ~ the 4th bent moon positive lens (11) composition develops counter to take the photograph focal power in structure far away be positive rear lens group II.
3. as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, rear lens group II divides for again lens combination II A organized by the first bent moon negative lens (5) ~ second convex surface positive lens (7), air-spaced doublet group II B is formed by the second bent moon positive lens (8) and the 3rd bent moon positive lens (9), and field lens group II C be made up of the second bent moon negative lens (10) and the 4th bent moon positive lens (11).
4., as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, front lens group (I) is made up of the first bent moon positive lens (2) of LAF5 material and the first concave surface negative lens (3) of HZF50 material.
5. as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, to be that three separation are negative just combine lens combination II A, is made up of the second convex surface positive lens (7) of the first bent moon negative lens (5) of HZF72A material, first biconvex positive lens (6) of HLAK52 material and HLAK4L material; Because the first bent moon negative lens (5) focal power of HZF72A material is less, the HLAK52 material positive lens that lens combination II A also can be reduced in the less demanding situation of achromatism just combines with two separation of HLAK4L material positive lens.
6. as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, air-spaced doublet group II B of two positive lens compositions is made up of the second bent moon positive lens (8) of LAF5 material and the 3rd bent moon positive lens (9) of LAF5 material.
7., as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, field lens group II C is made up of the second bent moon negative lens (10) of HZF72A material and the 4th bent moon positive lens (11) of LAF5 material.
8. as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, described heavy caliber little F number optical system lens face shape is all sphere, service band scope 500nm ~ 850nm, field angle ± 8 °, focal length 250mm, entrance pupil bore 300mm, F number is 0.833, and namely focal distance f=250 are F=f/D=0.833 with the ratio of entrance pupil bore D=300.
9. as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, the overall length of described heavy caliber little F number optical system from the curved surface summit of the close object plane (1) of the first bent moon positive lens (2) to focal plane (12) is no more than 790mm, maximum caliber is no more than 380mm, maximum coefficient of vignetting is less than 11%, and the root mean square RMS value size of the disc of confusion within the scope of full filed is no more than 20 microns.
10. as claimed in claim 1 for the heavy caliber little F number optical system of TV wave band, it is characterized in that, infinite distance parallel input light is from object plane (1), through the first bent moon positive lens (2) of LAF5 material, first concave surface negative lens (3) of HZF50 material, diaphragm (4), first bent moon negative lens (5) of HZF72A material, first biconvex positive lens (6) of HLAK52 material, second convex surface positive lens (7) of HLAK4L material, second bent moon positive lens (8) of LAF5 material, 3rd bent moon positive lens (9) of LAF5 material, second bent moon negative lens (10) of HZF72A material and the 4th bent moon positive lens (11) of LAF5 material are imaged on focal plane (12), complete the overall process of imaging.
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| CN109143548A (en) * | 2018-10-11 | 2019-01-04 | 佛山科学技术学院 | A kind of long reach high-resolution image bilateral telecentric optical system |
| CN109765685A (en) * | 2019-03-28 | 2019-05-17 | 西安应用光学研究所 | A kind of double-view field transmission-type multisensor single aperture optical systems |
| CN114019662A (en) * | 2021-09-23 | 2022-02-08 | 北京控制工程研究所 | Large-view-field illumination uniformity optical system based on micro-lens array detector |
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