CN203759342U - Diffraction-element-comprising large view field and accurate image space telecentric aerial mapping camera optical system - Google Patents
Diffraction-element-comprising large view field and accurate image space telecentric aerial mapping camera optical system Download PDFInfo
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- CN203759342U CN203759342U CN201420081194.8U CN201420081194U CN203759342U CN 203759342 U CN203759342 U CN 203759342U CN 201420081194 U CN201420081194 U CN 201420081194U CN 203759342 U CN203759342 U CN 203759342U
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Abstract
The utility model provides a diffraction-element-comprising large view field and accurate image space telecentric aerial mapping camera optical system comprising a front lens assembly, a diaphragm, a double layer diffraction element and a rear lens assembly that are all orderly arranged along a incident light rays. The front lens assembly comprises a first negative meniscus lens, a first positive meniscus lens, a first convex lens, a first concave lens, a second positive meniscus lens and a double cemented lens that are all orderly arranged. The double layer diffraction element is used for diffracting light beams emitted from the diaphragm and is used for emitting the diffracted light beams into the rear lens assembly. The rear lens assembl comprises a second convex lens, a second negative meniscus lens, a third convex lens, a third negative meniscus lens and a forth convex lens that are all orderly arranged. According to the diffraction-element-comprising large view field and accurate image space telecentric aerial mapping camera optical system, common glass materials are combined with the double layer diffraction optical element which is high in diffraction efficiency, secondary spectrum color difference generated in design processes can be eliminated, an aerial mapping camera object lens system which is good in imaging quality is obtained, and active effects are exerted on improvement of imaging quality of a large view field and high resolution aerial mapping camera.
Description
Technical field
The utility model belongs to aviation optical imagery and remote sensing technology field, relates to a kind of accurate image space in large visual field heart aviation measuring camera far away optical system containing diffraction element.
Background technology
Digitizing aeroplane mapping camera applications, in Surveying Engineering, by conjunction with technology such as modern communication, GPS difference location and inertial navigations, can directly be obtained atural object digital stereo image, so that atural object is carried out to correlation analysis.In recent years, aeroplane photography surveying and mapping technology is with its ageing strong, advantage such as target image directly perceived, maneuverability, accuracy rate are high, with strong points, be subject to the extensive attention of countries in the world, and be widely used in many fields such as geography information mapping, environmental remote sensing, resource investigation, disaster prevention and control, especially the data, services in large scale topographical map field of drawing such as digital city construction, land resources investigations has vital effect.
In recent years, because the domestic Primary Component technology of preparing for aviation measuring camera falls behind, although obtained certain progress in the research of aeroplane photography survey field, with respect to Foreign Advanced Lerel, still there is larger gap; For a long time, the aviation measuring camera major part of domestic air mail photography applications is purchased in abroad, comprises the DMC of Z/I company, the digitizing aviation measuring cameras such as ADS40/80 of the UCD of Vexcel company, Leica company.
Along with aeroplane photography surveying and mapping technology development, for obtaining large-scale photograph, high-level efficiency is taken, aeroplane mapping camera optics system index also further improves, the high-performance aeroplane mapping camera of present stage is all at the future development towards large visual field, long-focus, and the problem of thereupon bringing is that the various aberrations of its optical system become large, and it is extremely difficult that aberration correction and balance work become, system architecture becomes increasingly complex huge, becomes the key factor that limits its development.
The second order spectrum aberration producing in aviation measuring camera Optical System Design process is the main factor of restriction long-focus large field aviation measuring camera image quality, because the special optical glass material price costliness and the mechanical and physical performance that adopt in traditional design are poor, processing difficulties, therefore be not suitable for the correction to second order spectrum aberration in aerial camera Optical System Design, and diffraction element has Negative Dispersion Properties, be applied to can proofread and correct well the second order spectrum aberration in its Optical System Design in long burnt aerial camera.
Therefore, being badly in need of a kind of diffraction element that can utilize is combined with optical system, reach and eliminate the second order spectrum aberration producing in design process, obtain the aeroplane mapping camera object lens system of good image quality, and easily obtain, ensure the quality of products, cheap, reached the aviation measuring camera optical system that reduces the object of cost of development.
Utility model content
In order to solve existing technical matters in background technology, the utility model provides a kind of accurate image space in large visual field heart aviation measuring camera far away optical system containing diffraction element.
Technical solution of the present utility model is:
The utility model provides a kind of accurate image space in large visual field heart aviation measuring camera far away optical system containing diffraction element, and its special character is: comprise the front lens assembly, diaphragm, double-layer diffraction element and the rear lens assembly that along incident ray, set gradually;
Described front lens assembly comprises the first bent moon negative lens, the first bent moon positive lens, the first convex lens, the first concavees lens, the second bent moon positive lens and the cemented doublet setting gradually; Described double-layer diffraction element is for carrying out the light beam of diaphragm outgoing diffraction and inject rear lens assembly;
Described rear lens assembly comprises the second convex lens, the second bent moon negative lens, the 3rd convex lens, the 3rd bent moon negative lens and the 4th convex lens that set gradually;
The incident receiving plane of the first bent moon negative lens of above-mentioned front lens assembly is quadric surface; The incident receiving plane of the 4th convex lens of described rear lens assembly is quadric surface;
The material that the lens of above-mentioned front lens assembly and rear lens assembly are colouless optical glass and glass employing is K9, ZK9, F2, ZF2, ZF3, ZF13, QK3 or BaK7;
Above-mentioned double-layer diffraction element is usingd K9 glass and F2 glass as substrate;
Above-mentioned cemented doublet is formed by the ZF3 lens of high dispersion and the ZK9 lens of low dispersion gummed;
Cemented doublet exit facet and the distance between diaphragm of above-mentioned front lens assembly are 5mm; Distance between described diaphragm and double-layer diffraction element incident receiving plane is 38.277mm; Distance between the second convex lens incident receiving plane of described double-layer diffraction element exit facet and rear lens assembly is 15mm; The 4th convex lens exit facet of described rear lens assembly is 41.475mm to the distance that receives image planes;
In above-mentioned front lens assembly, the first bent moon negative lens center thickness is 8mm; The distance of described the first bent moon negative lens exit facet and the first bent moon positive lens incident receiving plane is 36mm; The center thickness of described the first bent moon positive lens is 15mm; The distance of described the first bent moon positive lens exit facet and the first convex lens incident receiving plane is 7.693mm; Described the first convex lens center thickness is 15mm; The distance of described the first convex lens exit facet and the first concavees lens incident receiving plane is 8mm; Described the first concavees lens center thickness is 10mm; The distance of described the first concavees lens exit facet and the second bent moon positive lens incident receiving plane is 22.444mm; Described the second bent moon positive lens center thickness is 10.474mm; The distance of the ZF3 lens incident receiving plane of the high dispersion of described the second bent moon positive lens exit facet and cemented doublet is 22.534mm; The high dispersion ZF3 lens center thickness of described cemented doublet is 10mm; The low dispersion ZK9 lens center thickness of described cemented doublet is 20mm; The low dispersion ZK9 lens exit facet of described cemented doublet and the distance of diaphragm are 5mm; The distance of the K9 lens incident receiving plane of described diaphragm and double-layer diffraction element is 38.277mm; Described double-layer diffraction element K9 lens center thickness is 5mm; The F2 lens center thickness of described double-layer diffraction element is 8mm; In the F2 lens exit facet of described double-layer diffraction element and rear lens assembly, the distance of the second convex lens incident receiving plane is 15mm; Described the second convex lens center thickness is 14.503mm; In described rear lens assembly, the second convex lens exit facet and the second bent moon negative lens incident receiving plane distance are 42.650mm; Described the second bent moon negative lens center thickness is 10mm; Described the second bent moon negative lens exit facet and the 3rd convex lens incident receiving plane distance are 11.361mm; Described the 3rd convex lens center thickness is 23mm; Described the 3rd convex lens exit facet and the 3rd bent moon negative lens incident receiving plane distance are 48.958mm; Described the 3rd bent moon negative lens center thickness is 15mm; Described the 3rd bent moon negative lens exit facet and the 4th convex lens incident receiving plane distance are 6.710mm; Described the 4th convex lens center thickness is 30mm; Described the 4th convex lens exit facet is 41.475mm to the distance that receives image planes.
Advantage of the present utility model:
1, the utility model is used simple glass material to be combined with the double-layer diffraction optical element of high-diffraction efficiency and eliminates the second order spectrum aberration producing in design process, obtain the aeroplane mapping camera object lens system of good image quality, for the raising of the image quality of large visual field high resolution aviation measuring camera has produced positive effect.
2, optical system lens of the present utility model all adopt domestic optical glass material, make its mechanical property raising, corrosion-resistant and good thermal stability, cheap, have reached the object that reduces cost of development.
Accompanying drawing explanation
Fig. 1 is large visual field accurate image space heart aviation measuring camera far away optical system structure and the light path schematic diagram that the utility model contains diffraction element;
Fig. 2 is system MTF curve of the present utility model;
Fig. 3 is system point range figure of the present utility model;
Fig. 4 is system aberration curve map of the present utility model
Fig. 5 is double-layer diffraction element schematic diagram of the present utility model;
Wherein: 1-the first bent moon negative lens, 2-the first bent moon positive lens, 3-the first convex lens, 4-the first concavees lens, 5-the second bent moon positive lens, 6-cemented doublet, 7-diaphragm, 8-double-layer diffraction element, 9-the second convex lens, 10-the second bent moon negative lens, 11-the 3rd convex lens, 12-the 3rd bent moon negative lens, 13-the 4th convex lens, 14-receives image planes.
Embodiment
The utility model provides a kind of accurate image space in large visual field heart aviation measuring camera far away optical system containing diffraction element, comprises the front lens assembly, diaphragm 7, double-layer diffraction element 8 and the rear lens assembly that along incident ray, set gradually;
Front lens assembly comprises the first bent moon negative lens 1, the first bent moon positive lens 2, the first convex lens 3, the first concavees lens 4, the second bent moon positive lens 5 and the cemented doublet 6 setting gradually; Front lens assembly is used for adjusting incident beam bore, and will after laser beam compression, be full of diaphragm 7 outgoing;
Double-layer diffraction element 8 is for carrying out the light beam of diaphragm 7 outgoing diffraction and inject rear lens assembly;
Rear lens assembly comprises the second convex lens 9, the second bent moon negative lens 10, the 3rd convex lens 11, the 3rd bent moon negative lens 12 and the 4th convex lens 13 that set gradually; Rear lens assembly is for being undertaken by diffraction incident beam that whole off-axis aberrations minimize and the correction of the curvature of field reach the object of accurate telecentric beam path in image space;
The incident receiving plane of the first bent moon negative lens 1 of front lens assembly is quadric surface; The incident receiving plane of the 4th convex lens 13 of rear lens assembly is quadric surface;
The material that the lens of front lens assembly and rear lens assembly are colouless optical glass and glass employing is K9, ZK9, F2, ZF2, ZF3, ZF13, QK3 or BaK7, and is the conventional optical glass of the domestic trade mark;
Double-layer diffraction element 8 is usingd K9 glass and F2 glass as substrate;
Cemented doublet 6 is formed by the ZF3 lens of high dispersion and the ZK9 lens of low dispersion gummed;
Cemented doublet 6 exit facets of front lens assembly and the distance between diaphragm 7 are 5mm; Distance between diaphragm 7 and double-layer diffraction element 8 incident receiving planes is 38.277mm; Distance between the second convex lens 9 incident receiving planes of double-layer diffraction element 8 exit facets and rear lens assembly is 15mm; The 4th convex lens 13 exit facets of rear lens assembly are 41.475mm to the distance that receives image planes 14.
In front lens assembly, the first bent moon negative lens 1 center thickness is 8mm; The distance of the first bent moon negative lens 1 exit facet and the first bent moon positive lens 2 incident receiving planes is 36mm; The center thickness of the first bent moon positive lens 2 is 15mm; The distance of the first bent moon positive lens 2 exit facets and the first convex lens 3 incident receiving planes is 7.693mm; The first convex lens 3 center thicknesses are 15mm; The distance of described the first convex lens 3 exit facets and the first concavees lens 4 incident receiving planes is 8mm; The first concavees lens 4 center thicknesses are 10mm; The distance of the first concavees lens 4 exit facets and the second bent moon positive lens 5 incident receiving planes is 22.444mm; The second bent moon positive lens 5 center thicknesses are 10.474mm; The distance of the ZF3 lens incident receiving plane of the high dispersion of the second bent moon positive lens 5 exit facets and cemented doublet 6 is 22.534mm; The high dispersion ZF3 lens center thickness of cemented doublet 6 is 10mm; The low dispersion ZK9 lens center thickness of cemented doublet 6 is 20mm; The low dispersion ZK9 lens exit facet of cemented doublet 6 and the distance of diaphragm 7 are 5mm; Diaphragm 7 is 38.277mm with the distance of the K9 lens incident receiving plane of double-layer diffraction element 8; The K9 lens center thickness of double-layer diffraction element 8 is 5mm; The F2 lens center thickness of double-layer diffraction element 8 is 8mm; In the F2 lens exit facet of double-layer diffraction element 8 and rear lens assembly, the distance of the second convex lens 9 incident receiving planes is 15mm; The second convex lens 9 center thicknesses are 14.503mm; In rear lens assembly, the second convex lens 9 exit facets and the second bent moon negative lens 10 incident receiving plane distances are 42.650mm; Described the second bent moon negative lens 10 center thicknesses are 10mm; The second bent moon negative lens 10 exit facets and the 3rd convex lens 11 incident receiving plane distances are 11.361mm; The 3rd convex lens 11 center thicknesses are 23mm; The 3rd convex lens 11 exit facets and the 3rd bent moon negative lens 12 incident receiving plane distances are 48.958mm; The 3rd bent moon negative lens 12 center thicknesses are 15mm; The 3rd bent moon negative lens 12 exit facets and the 4th convex lens 13 incident receiving plane distances are 6.710mm; The 4th convex lens 13 center thicknesses are 30mm; The 4th convex lens 13 exit facets are 41.475mm to the distance that receives image planes 14.
1, transmission type optical system
Because transmission type optical system version has rotational symmetric feature, easily realize the requirement of object lens of large relative aperture, wide spectrum, large visual field, high imaging quality, and than reflect system, the processing of transmission-type system, detection and integration techno logy are all comparatively ripe, and engineering exploitativeness is high; So most employings is transmission-type structure in aerial camera optical system; Adopt this version, its variable is many, and degree of freedom is many, and the optical system of this version easily reaches or approaches diffraction limit.
Referring to Fig. 1, the accurate image space in the large visual field heart aviation measuring camera far away optical system containing diffraction element that the utility model is designed, system overall length is 500mm, and maximum optic diameter is 223mm, and rear cut-off distance is 41.475mm, and using eyeglass number is 14; The material that lens adopt has: K9, ZK9, F2, ZF2, ZF3, ZF13, QK3 or BaK7, be the conventional optical glass of the domestic trade mark, and good mechanical property, corrosion-resistant, Heat stability is good, cheap, reached the object that reduces cost of development.
As seen from Figure 1, the integral layout near symmetrical structure distribution of system, be conducive to the correction of the vertical axial aberrations such as entire system coma, and the aberration such as the method correcting chromatic aberration of the Optimized Matching by focal power, spherical aberration, coma, the curvature of field, astigmatism, meanwhile, use simple glass material to be combined and to have eliminated residue second order spectrum aberration with the double-layer diffraction optical element of high-diffraction efficiency.
Along light incident direction, with optical axis, place optical lens group, its structure is divided into successively front lens assembly, diaphragm 7, double-layer diffraction element 8, rear lens assembly and receives image planes 14; And the effect contact of the position of front lens group, diaphragm 7, double-layer diffraction element 8, rear lens group and reception image planes 14 is:
1) radiation laser beam of mapping target is adjusted beam size through front lens group, will after laser beam compression, be full of diaphragm 7 outgoing;
2) from the light beam of diaphragm 7 outgoing, through double-layer diffraction element 8 diffraction, reach rear lens group;
3) rear lens group carries out light beam that whole off-axis aberrations minimize and the correction of the curvature of field, to reach the object of accurate telecentric beam path in image space, finally images in reception image planes.
By above-mentioned contact, the radiation laser beam of mapping target is full of diaphragm 7 outgoing after front lens group is adjusted beam size, and outgoing beam, through double-layer diffraction element 8 and rear lens group, images in and receives image planes 14.
1.1, structural relation
Along light incident direction front lens assembly, comprise seven lens, by light path order respectively: the first bent moon negative lens 1, the first bent moon positive lens 2, the first convex lens 3, the first concavees lens 4, the second bent moon positive lens 5 and cemented doublet 6;
Wherein, cemented doublet 6 is the lens composition of two gummeds; Described cemented doublet 6 is formed by the ZF3 lens of high dispersion and the ZK9 lens of low dispersion gummed, and median surface is cemented surface, and its effect is mainly used for corrective system aberration.
Particularly, the first surface of front lens assembly first lens (i.e. the first bent moon negative lens 1) adopts quadric surface, by such being provided with, benefit correct astigmatism and distortion, and be conducive to part or all of off-axis aberration and minimize, and then can increase the field angle of designed optical system, and be conducive to improve the homogeneity of image planes illuminance.
Wherein, double-layer diffraction element 8 is usingd K9 glass and F2 glass as substrate, joined in optical system, be placed on after rear first minute surface of diaphragm 7, this surface angle of incidence of light is less, diffraction efficiency is high, and the position that is diameter minimum in system, this position, place, and designed diffraction element is easy to processing.
Rear lens assembly is five lens, its by light path order respectively: the second convex lens 9, the second bent moon negative lens 10, the 3rd convex lens 11, the 3rd bent moon negative lens 12 and the 4th convex lens 13, wherein the first surface of the second convex lens 9 is quadric surface; Particularly, it is nearer that the 4th convex lens 13 distance receives image planes 14, and the first surface of the 4th convex lens 13 is again quadric surface, is of value to like this correction curvature of field, to reach the object of accurate telecentric beam path in image space, and is conducive to part or all of off-axis aberration and minimizes.
14 lens materials that above-mentioned optical system comprises are colouless optical glass, and the surface that every a slice lens contact with air is all coated with anti-reflection film, to increase the energy transmission efficiency of this broadband imaging optical system.
1.2, satisfy condition
Optical system comprises 14 lens should meet following relation:
In formula, h
ifor the delivery altitude of normalization the first paraxial rays on each lens, h
1for the delivery altitude of normalization the first paraxial rays on the first bent moon negative lens, Φ
1for each power of lens of normalization, ρ
i, θ
ithe poor coefficient of the heat that disappears and the achromatism coefficient that are respectively each lens, Φ is the focal power of normalizing beggar optical system.
Referring to Fig. 1, according to each assembly of incident ray and each lens position order, according to final optimization pass, design is determined, on the position relationship of optical system as shown in following related data wherein: the location gap (take optical axis as reference axis) that table 1 is each eyeglass; The location gap (take optical axis as reference axis) that table 2 is each optical surface;
| Eyeglass | Spacing/mm | Stop(diaphragm) | 38.277 |
| Object | Infinite distance | 9 | 0(9,10 is double-layer diffraction element) |
| 1 | 36 | 10 | 15 |
| 2 | 7.693 | 11 | 42.65 |
| 3 | 8 | 12 | 11.351 |
| 4 | 22.444 | 13 | 48.958 |
| 5 | 22.534 | 14 | 6.71 |
| 6 | 0(6,7 is gummed mirror) | 15 | 41.475 |
| 7 | 5 | Image planes |
Table 1
| Minute surface | Spacing/mm | Stop(diaphragm) | 38.277 |
| Object | Infinite distance | 15 | 5 |
| 1 | 8 | 16 | 8(double-layer diffraction element cemented surface) |
| 2 | 36 | 17 | 15 |
| 3 | 15 | 18 | 14.503 |
| 4 | 7.693 | 19 | 42.650 |
| 5 | 15 | 20 | 10 |
| 6 | 8 | 21 | 11.361 |
| 7 | 10 | 22 | 23 |
| 8 | 22.444 | 23 | 48.958 |
| 9 | 10.474 | 24 | 15 |
| 10 | 22.534 | 25 | 6.710 |
| 11 | 10(cemented surface) | 26 | 30 |
| 12 | 20 | 27 | 41.475 |
| 13 | 5 | Image planes |
Table 2
Associative list 1 and table 2 data, wherein, take optical axis as reference axis, and cemented doublet 6 exit facets of front lens assembly and the distance between diaphragm 7 are 5mm; Distance between diaphragm 7 and double-layer diffraction element 8 incident receiving planes is 38.277mm; Distance between the second convex lens 9 incident receiving planes of double-layer diffraction element 8 exit facets and rear lens assembly is 15mm; The 4th convex lens 13 exit facets of rear lens assembly are 41.475mm to the distance that receives image planes 14.
In front lens assembly, the first bent moon negative lens 1 center thickness is 8mm; The distance of the first bent moon negative lens 1 exit facet and the first bent moon positive lens 2 incident receiving planes is 36mm; The center thickness of the first bent moon positive lens 2 is 15mm; The distance of the first bent moon positive lens 2 exit facets and the first convex lens 3 incident receiving planes is 7.693mm; The first convex lens 3 center thicknesses are 15mm; The distance of described the first convex lens 3 exit facets and the first concavees lens 4 incident receiving planes is 8mm; The first concavees lens 4 center thicknesses are 10mm; The distance of the first concavees lens 4 exit facets and the second bent moon positive lens 5 incident receiving planes is 22.444mm; The second bent moon positive lens 5 center thicknesses are 10.474mm; The distance of the ZF3 lens incident receiving plane of the high dispersion of the second bent moon positive lens 5 exit facets and cemented doublet 6 is 22.534mm; The high dispersion ZF3 lens center thickness of cemented doublet 6 is 10mm; The low dispersion ZK9 lens center thickness of cemented doublet 6 is 20mm; The low dispersion ZK9 lens exit facet of cemented doublet 6 and the distance of diaphragm 7 are 5mm; Diaphragm 7 is 38.277mm with the distance of the K9 lens incident receiving plane of double-layer diffraction element 8; The K9 lens center thickness of double-layer diffraction element 8 is 5mm; The F2 lens center thickness of double-layer diffraction element 8 is 8mm; In the F2 lens exit facet of double-layer diffraction element 8 and rear lens assembly, the distance of the second convex lens 9 incident receiving planes is 15mm; The second convex lens 9 center thicknesses are 14.503mm; In rear lens assembly, the second convex lens 9 exit facets and the second bent moon negative lens 10 incident receiving plane distances are 42.650mm; Described the second bent moon negative lens 10 center thicknesses are 10mm; The second bent moon negative lens 10 exit facets and the 3rd convex lens 11 incident receiving plane distances are 11.361mm; The 3rd convex lens 11 center thicknesses are 23mm; The 3rd convex lens 11 exit facets and the 3rd bent moon negative lens 12 incident receiving plane distances are 48.958mm; The 3rd bent moon negative lens 12 center thicknesses are 15mm; The 3rd bent moon negative lens 12 exit facets and the 4th convex lens 13 incident receiving plane distances are 6.710mm; The 4th convex lens 13 center thicknesses are 30mm; The 4th convex lens 13 exit facets are 41.475mm to the distance that receives image planes 14.
Referring to Fig. 2-Fig. 4, on detector is selected, the receiving device Pixel Dimensions that adopts is 5.5 μ m * 5.5 μ m, and obtaining receiver spatial resolution is as calculated 90lp/mm, and designed optical system at least should have at 90lp/mm place good image quality.Fig. 2 is the modulation transfer function (MTF) curve map of optical system, as shown in Figure 2, getting MTF curve map spatial-cut-off frequency is 100lp/mm, each visual field mtf value of designed system optics at spatial resolution 100lp/mm place all more than 0.5, the mtf value of visual field, center approaches diffraction limit, shows that system imaging quality is very good.Fig. 3 is the point range figure of designed system, and as seen from the figure, the point range figure of this each visual field of system is all less than pixel dimension 5.5 μ m, illustrative system good imaging quality.
Fig. 4 is the aberration curve figure of designed optical system, can see that the spherical aberration value of each coloured light within the scope of whole service band 430nm～885nm is all less than 0.02mm, and system spherical aberration has obtained good correction.Meanwhile, can find out that system second order spectrum aberration has also obtained good correction; Astigmatism, the curvature of field are all less than 0.03mm; Distortion is less than 1% and close to straight line.
2, double-layer diffraction element
The second order spectrum aberration producing in aviation measuring camera Optical System Design process is the main factor of restriction long-focus large field aviation measuring camera image quality, because the special optical glass material price costliness and the mechanical and physical performance that adopt in traditional design are poor, processing difficulties, therefore be not suitable for the correction to second order spectrum aberration in aerial camera Optical System Design, and diffraction element has Negative Dispersion Properties, be applied to can well proofread and correct the second order spectrum aberration in its Optical System Design in long burnt aerial camera.
Referring to Fig. 5, for double-layer diffraction optics 8 elements (as Fig. 1 marker location) that adopt in design result, select two kinds of refractive index differences, the different combination of materials of dispersion to arrive together, get K9 glass and F2 glass as substrate, substrate etching depth parameter is modulated, and take into account incident angle simultaneously, spectral range and diffraction efficiency, through suitably optimizing, when etching depth is got d1=19.9 μ m and d2=24.8 μ m, reach higher diffraction efficiency; Final design double-layer diffraction optical element 8 as shown in Figure 5, total radius is 44mm, have 204 endless belt, minimum ring bandwidth 0.108mm, substrate is plane, has realized the double-layer diffraction optical element 8 of simple glass material and high-diffraction efficiency in conjunction with eliminating the second order spectrum aberration producing in design process.
3, accurate telecentric beam path in image space
The impact that is subject to angle of incidence of light degree due to the quantum efficiency of CCD or cmos detector part is larger, in order to improve the relative exposure of whole optics visual field, so, this patent need become Optical System Design accurate image space telecentric system, with the chief ray of each visual field outgoing beam of assurance system, be all similar to and be parallel to optical axis, the light of each field angle can near normal be incided on detector target surface, thereby brightness of image in full visual field is uniformly distributed.Last a slice eyeglass in design result is nearer apart from image planes, is mainly used in proofreading and correct the curvature of field, to reach the object of accurate telecentric beam path in image space.
This patent has designed a kind of accurate image space in large visual field heart transmission type optical system far away containing diffraction optical element, its optical system feature: long-focus (f=200mm), wide spectrum (430nm～885nm), large visual field (full visual field 60 degree).Use simple glass material to be combined with the double-layer diffraction optical element of high-diffraction efficiency and eliminate the second order spectrum aberration producing in design process, obtain the aeroplane mapping camera object lens system of good image quality; In conjunction with achievement and the experience of external relevant device design, application, closely in conjunction with actual use, considering, on the basis of process technology, to select rational lens materials and design proposal, completed the autonomous innovation of domestic similar technology; Meanwhile, the utility model is selected the optical glass of the domestic trade mark, easily obtains and ensures the quality of products, cheap, has reached the object that reduces cost of development.
Claims (7)
1. containing the accurate image space in a large visual field heart aviation measuring camera far away optical system for diffraction element, it is characterized in that: comprise the front lens assembly, diaphragm, double-layer diffraction element and the rear lens assembly that along incident ray, set gradually;
Described front lens assembly comprises the first bent moon negative lens, the first bent moon positive lens, the first convex lens, the first concavees lens, the second bent moon positive lens and the cemented doublet setting gradually;
Described double-layer diffraction element is for carrying out the light beam of diaphragm outgoing diffraction and inject rear lens assembly;
Described rear lens assembly comprises the second convex lens, the second bent moon negative lens, the 3rd convex lens, the 3rd bent moon negative lens and the 4th convex lens that set gradually.
2. the accurate image space in the large visual field heart aviation measuring camera far away optical system containing diffraction element according to claim 1, is characterized in that: the incident receiving plane of the first bent moon negative lens of described front lens assembly is quadric surface; The incident receiving plane of the 4th convex lens of described rear lens assembly is quadric surface.
3. the accurate image space in the large visual field heart aviation measuring camera far away optical system containing diffraction element according to claim 1, is characterized in that: the material that the lens of described front lens assembly and rear lens assembly are colouless optical glass and glass employing is K9, ZK9, F2, ZF2, ZF3, ZF13, QK3 or BaK7.
4. the accurate image space in the large visual field heart aviation measuring camera far away optical system containing diffraction element according to claim 1, is characterized in that: described double-layer diffraction element is usingd K9 glass and F2 glass as substrate.
5. the accurate image space in the large visual field heart aviation measuring camera far away optical system containing diffraction element according to claim 1, is characterized in that: described cemented doublet is formed by the ZF3 lens of high dispersion and the ZK9 lens of low dispersion gummed.
6. the accurate image space in the large visual field heart aviation measuring camera far away optical system containing diffraction element according to claim 1, is characterized in that: cemented doublet exit facet and the distance between diaphragm of described front lens assembly are 5mm; Distance between described diaphragm and double-layer diffraction element incident receiving plane is 38.277mm; Distance between the second convex lens incident receiving plane of described double-layer diffraction element exit facet and rear lens assembly is 15mm; The 4th convex lens exit facet of described rear lens assembly is 41.475mm to the distance that receives image planes.
7. the accurate image space in the large visual field heart aviation measuring camera far away optical system containing diffraction element according to claim 6, is characterized in that: in described front lens assembly, the first bent moon negative lens center thickness is 8mm; The distance of described the first bent moon negative lens exit facet and the first bent moon positive lens incident receiving plane is 36mm; The center thickness of described the first bent moon positive lens is 15mm; The distance of described the first bent moon positive lens exit facet and the first convex lens incident receiving plane is 7.693mm; Described the first convex lens center thickness is 15mm; The distance of described the first convex lens exit facet and the first concavees lens incident receiving plane is 8mm; Described the first concavees lens center thickness is 10mm; The distance of described the first concavees lens exit facet and the second bent moon positive lens incident receiving plane is 22.444mm; Described the second bent moon positive lens center thickness is 10.474mm; The distance of the ZF3 lens incident receiving plane of the high dispersion of described the second bent moon positive lens exit facet and cemented doublet is 22.534mm; The high dispersion ZF3 lens center thickness of described cemented doublet is 10mm; The low dispersion ZK9 lens center thickness of described cemented doublet is 20mm; The low dispersion ZK9 lens exit facet of described cemented doublet and the distance of diaphragm are 5mm; The distance of the K9 lens incident receiving plane of described diaphragm and double-layer diffraction element is 38.277mm; Described double-layer diffraction element K9 lens center thickness is 5mm; The F2 lens center thickness of described double-layer diffraction element is 8mm; In the F2 lens exit facet of described double-layer diffraction element and rear lens assembly, the distance of the second convex lens incident receiving plane is 15mm; Described the second convex lens center thickness is 14.503mm; In described rear lens assembly, the second convex lens exit facet and the second bent moon negative lens incident receiving plane distance are 42.650mm; Described the second bent moon negative lens center thickness is 10mm; Described the second bent moon negative lens exit facet and the 3rd convex lens incident receiving plane distance are 11.361mm; Described the 3rd convex lens center thickness is 23mm; Described the 3rd convex lens exit facet and the 3rd bent moon negative lens incident receiving plane distance are 48.958mm; Described the 3rd bent moon negative lens center thickness is 15mm; Described the 3rd bent moon negative lens exit facet and the 4th convex lens incident receiving plane distance are 6.710mm; Described the 4th convex lens center thickness is 30mm; Described the 4th convex lens exit facet is 41.475mm to the distance that receives image planes.
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|---|---|---|---|
| CN201420081194.8U CN203759342U (en) | 2013-12-02 | 2014-02-25 | Diffraction-element-comprising large view field and accurate image space telecentric aerial mapping camera optical system |
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| CN201320792637.X | 2013-12-02 | ||
| CN201320792637 | 2013-12-02 | ||
| CN201420081194.8U CN203759342U (en) | 2013-12-02 | 2014-02-25 | Diffraction-element-comprising large view field and accurate image space telecentric aerial mapping camera optical system |
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| CN203759342U true CN203759342U (en) | 2014-08-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809270A (en) * | 2013-12-02 | 2014-05-21 | 中国科学院西安光学精密机械研究所 | Optical system containing diffraction component for large-view-field quasi-telecentric aerial survey camera |
| CN104932083A (en) * | 2015-06-11 | 2015-09-23 | 北京空间机电研究所 | Large-area array dynamic monitoring and measuring camera optical system |
| CN115308877A (en) * | 2022-07-28 | 2022-11-08 | 广州长步道光学科技有限公司 | Large-wide-angle low-distortion full-picture unmanned aerial vehicle imaging lens |
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2014
- 2014-02-25 CN CN201420081194.8U patent/CN203759342U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103809270A (en) * | 2013-12-02 | 2014-05-21 | 中国科学院西安光学精密机械研究所 | Optical system containing diffraction component for large-view-field quasi-telecentric aerial survey camera |
| CN104932083A (en) * | 2015-06-11 | 2015-09-23 | 北京空间机电研究所 | Large-area array dynamic monitoring and measuring camera optical system |
| CN115308877A (en) * | 2022-07-28 | 2022-11-08 | 广州长步道光学科技有限公司 | Large-wide-angle low-distortion full-picture unmanned aerial vehicle imaging lens |
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