CN209560186U - A kind of high-resolution large-viewing-field ultra-low distortion optical system - Google Patents
A kind of high-resolution large-viewing-field ultra-low distortion optical system Download PDFInfo
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- CN209560186U CN209560186U CN201920552531.XU CN201920552531U CN209560186U CN 209560186 U CN209560186 U CN 209560186U CN 201920552531 U CN201920552531 U CN 201920552531U CN 209560186 U CN209560186 U CN 209560186U
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Abstract
The utility model discloses a kind of high-resolution large-viewing-field ultra-low distortion optical system, which sequentially includes window mirror, the first negative lens, the first positive lens, the second positive lens, the second negative lens, optical filter, diaphragm, third negative lens, third positive lens, the 4th positive lens, the 5th positive lens and the 4th negative lens by object side to image side.The system structure is compact, is made of nine lens；The corrosivity of ionizing radiation is reduced using radiation resistant glass material；Shortwave radiation is avoided to the influence of system using optical filter, introduces aspherical raising imaging precision.The optical system has the imaging characteristics of high-resolution, big visual field, ultra-low distortion and different visual field uniform-illuminations, it can be achieved that high-precision positioning function, has certain application value in the application of space flight high accuracy positioning.
Description
Technical field
The present invention relates to a kind of optical system, more particularly to it is a kind of for photoelectricity capture, military surveillance, aerial survety and
The space flight objective lens optical system of high-precision spatial spacecrafts rendezvous etc..
Background technique
Space flight object lens have very extensive purposes, including photoelectricity capture, military surveillance, aerial survety and high-precision sky
Between spacecrafts rendezvous etc..In the application of the high accuracy positionings such as aerospace spacecrafts rendezvous, for the minor detail of resolution target object, obtain
To image is more clear, optical imaging system is needed to have the characteristics that high-resolution, low distortion, big visual field.It is real both at home and abroad at present
The main path of existing high-resolution imaging detection has: small field of view high-resolution imaging, such as off-axis reflection optical system, but its
Field angle is relatively narrow, and contour structures are larger, and adjustment is complicated；The imaging of hemispherical flake exists although field angle can be more than 180 °
Biggish distortion influences the geometric accuracy of image planes.
Field angle is bigger, and the target zone absorbed is more extensive, and ultra-low distortion is implemented as system image data is high-precision
The key of registration is spent, although distortion will not influence the image quality of system, will lead to geometric accuracy reduction, it is right to high-precision
It scoops out with bringing serious consequence.Distortion is only the function of visual field, and the vertical axis magnifying power of the reality of different visual fields is different, is distorted also just
It is different.Therefore in the design process of space flight object lens, distortion is more reduced while taking into account big visual field as far as possible.It uses simultaneously
Short focus improves systemic resolution than design.
The present invention provides a kind of high-resolution large-viewing-field ultra-low distortion optical systems to be designed using refraction type structure
It is a to have both high-resolution, big visual field, the optical system of low distortion, meet the subtle observation to specific objective, and consider
The ultraviolet, blue ray radiation that most of CCD generates vapor in atmosphere and dust granule is very sensitive and space ionising radiation
It will lead to the decaying of optical mirror slip transmissivity, therefore reduce shortwave radiation using optical filter herein and use radiation resistant glass material
Material guarantees system stability.
Summary of the invention
In order to realize the subtle observation to specific objective, the present invention provides one kind have nine lens, a gate mirror and
The optical system that one tablet filter is constituted, the optical system have high-resolution, ultra-low distortion and larger field, realize simultaneously
Compactedness and the optical property for keeping good aberration and telecentricity characteristic.
The structure of the high-resolution large-viewing-field ultra-low distortion optical system of technical solution of the present invention is as follows:
A kind of high-resolution large-viewing-field ultra-low distortion optical system, optical system by object side to image side sequentially include window mirror,
First negative lens, the first positive lens, the second positive lens, the second negative lens, optical filter, diaphragm, third negative lens, third are just saturating
Mirror, the 4th positive lens, the 5th positive lens and the 4th negative lens；The optical element is respectively positioned in same optical path, and TTL/EFL≤
4.9, wherein TTL is the window mirror object space side outermost point of the optical system to the distance of imaging surface, and EFL is the optical system
Focal length；0.42 >=BFL/EFL >=0.37, wherein BFL be the optical system the 4th negative lens element image side outermost point extremely
The distance of imaging surface, EFL are the focal length of the optical system.
Further, optical filter is placed in inside optical system, and is placed in front of diaphragm；The reception light of the optical filter
Angle, θ≤10 °, θ are the angle of light and optical filter normal direction.
Further, the second positive lens and the second negative lens are using forming a lens subassembly, two lens in conjunction with optical cement
The convex surface of the faying face of element is towards object space side；And second to meet following conditions public positive lens and the second negative lens element joint surface
Formula:
| R | Φ/2 >, wherein R is the center curvature radius of faying face, and Φ is the light effective aperture of faying face.
Further, the window mirror, the first negative lens and the first positive lens have been all made of anti-radiation optical glass material,
Remaining lens material is simple glass.
Further, the 4th positive lens, the 5th positive lens are dense-crown optical glass；Second negative lens, third
Negative lens, the 4th negative lens are attached most importance to flint optical glass.
Further, the 4th positive lens contains high order aspheric surface.
Further, first negative lens meets following condition formula:
Nd >=1.69, Vd >=54, wherein Nd indicates that the d optical index of the first negative lens element material, Vd indicate that first is negative
The d light Abbe constant of lens element material, d light is the visible light that wavelength is 588nm, and the first negative lens unit is towards the one of object
Face is the convex surface for control system distortion size.
Further, the 4th positive lens meets following condition formula:
1.58≤Nd≤1.62,58≤Vd≤65
Wherein Nd indicates that the d optical index of the 4th positive element material, Vd indicate the d light of the 4th positive element material
Abbe constant, d light are the visible lights that wavelength is 588nm；
5th positive lens meets following condition formula:
1.55≤Nd≤1.65,65≤Vd≤70
Wherein Nd indicates that the d optical index of the 5th positive element material, Vd indicate the d light of the 5th positive element material
Abbe constant, d light are the visible lights that wavelength is 588nm；
Further, second negative lens meets following condition formula:
1.75≤Nd≤1.85,25≤Vd≤28
Wherein Nd indicates that the d optical index of the second negative lens element material, Vd indicate the d light of the second negative lens element material
Abbe constant, d light are the visible lights that wavelength is 588nm；
The third negative lens meets following condition formula:
1.75≤Nd≤1.8,25≤Vd≤30
Nd >=1.76, Vd >=27.4, wherein Nd indicates that the d optical index of 8 element material of third negative lens, Vd indicate third
The d light Abbe constant of negative lens element material, d light are the visible lights that wavelength is 588nm；
4th negative lens meets following condition formula:
1.75≤Nd≤1.8,25≤Vd≤30
Wherein Nd indicates that the d optical index of the 4th negative lens element material, Vd indicate the d light of the 4th negative lens element material
Abbe constant, d light are the visible lights that wavelength is 588nm.
Technical effect of the invention is as follows:
1, a kind of high-resolution large-viewing-field ultra-low distortion optical system provided by the invention, the system choose double Gauss objective
As initial configuration, for large visual field optical system, quasi- symmetric form double Gauss objective is first choice, due to structure type pair
Claim, visual field increases bring off-axis aberration and is comparatively easy balance, especially relative distortion；In addition, system carried out it is quasi- remote
Heart light path design, each visual field chief ray approximately perpendicular to focal plane, further reduced the distortion of system, and double Gauss objective is made
It can be realized the ultra-low distortion of image quality for the optical system of initial configuration and quasi-telecentric light path design.
2, radiation hardness material has been used in system, window mirror, the first negative lens and the first positive lens have been all made of radiation hardness light
Glass material is learned, improves optical system to the corrosion resistance of ionizing radiation.
3, before filter plate is placed on aperture diaphragm, reduces inoperative wavelength and enter system imaging, while avoiding optical filtering
Piece is placed in incidence angle caused by front of optical system and generates serious spherical aberration and color difference greatly, improves the resolution of optical system
Rate.
4, introduced in optical texture aspherical, the 4th positive lens contains high order aspheric surface, further increases optical system
Image quality.
Detailed description of the invention
Fig. 1 is a kind of high-resolution large-viewing-field ultra-low distortion optical system structure schematic diagram in the embodiment of the present invention.
Fig. 2 is the distortion figure of optical system provided in the embodiment of the present invention.
Fig. 3 is the MTF curve of optical system provided in the embodiment of the present invention.
Fig. 4 is that the Monte Carlo analysis of optical system provided in the embodiment of the present invention covers MTF curve figure.
Specific embodiment
Specific embodiments of the present invention are described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, Fig. 1 is the schematic diagram of optical system embodiment in the present invention.As seen from Figure 1, the embodiment of the present invention
Described in optical system its window mirror 1 is set in sequence by object side to image side；First negative lens 2；First positive lens 3；Second positive lens
4；Second negative lens 5；Optical filter 6；Diaphragm 7；Third negative lens 8；Third positive lens 9；4th positive lens 10；5th positive lens
11；4th positive negative lens 12 forms；Focal plane 13 is wherein shown in FIG. 1.
Optical element is respectively positioned in same optical path, and above-mentioned optical system also needs to meet following condition, TTL/EFL≤4.9,
Middle TTL is the window mirror object space side outermost point of the optical system to the distance of imaging surface, and EFL is the focal length of the optical system；
0.42 >=BFL/EFL >=0.37, wherein BFL is the 4th negative lens element image side outermost point of the optical system to imaging surface
Distance, EFL be the optical system focal length.
First negative lens 2 meets following condition formula:
Nd >=1.69, Vd >=54, wherein Nd indicates that the d optical index of 2 element material of the first negative lens, Vd indicate that first is negative
The d light Abbe constant of lens element material, d light is the visible light that wavelength is 588nm, and the first negative lens unit is towards the one of object
Face is the convex surface for control system distortion size.
4th positive lens 10 meets following condition formula:
1.58≤Nd≤1.62,58≤Vd≤65
Wherein Nd indicates that the d optical index of 10 element material of the 4th positive lens, Vd indicate 10 element material of the 4th positive lens
D light Abbe constant, d light be wavelength be 588nm visible light；
5th positive lens 11 meets following condition formula:
1.55≤Nd≤1.65,65≤Vd≤70
Wherein Nd indicates that the d optical index of the 5th positive lens (11) element material, Vd indicate 11 element material of the 5th positive lens
The d light Abbe constant of material, d light are the visible lights that wavelength is 588nm；
Second negative lens 5 meets following condition formula:
1.75≤Nd≤1.85,25≤Vd≤28
Wherein Nd indicates that the d optical index of 5 element material of the second negative lens, Vd indicate the d of 5 element material of the second negative lens
Light Abbe constant, d light are the visible lights that wavelength is 588nm；
The third negative lens 8 meets following condition formula:
1.75≤Nd≤1.8,25≤Vd≤30
Nd >=1.76, Vd >=27.4, wherein Nd indicates that the d optical index of 8 element material of third negative lens, Vd indicate third
The d light Abbe constant of 8 element material of negative lens, d light are the visible lights that wavelength is 588nm；
4th negative lens 12 meets following condition formula:
1.75≤Nd≤1.8,25≤Vd≤30
Wherein Nd indicates that the d optical index of 12 element material of the 4th negative lens, Vd indicate 12 element material of the 4th negative lens
D light Abbe constant, d light be wavelength be 588nm visible light.
The technical parameter of each lens is as shown in table 1 in the embodiment of the present invention, wherein the surface serial number in table 1It is right
Answer the surface of each optical component, wherein surface 1. -2. refer to window mirror 1 two optical surfaces design parameter, 3.-be 4.
The design parameter of two optical surfaces of the first negative lens 2,5.-be 6. the first positive lens 3 two optical surfaces design ginseng
Number, is 7. the design parameter of the optical surface of the second positive lens 4；9. 8. being the design of two optical surfaces of the second negative lens 5
Parameter,It is the design parameter of two optical surfaces of optical filter 6；It is the design parameter of diaphragm,It is that third is negative saturating
The design parameter of the optical surface of mirror 8；It is the design parameter of the optical surface of third positive lens 9；It is the 4th just
The design parameter of the optical surface of lens 10；The design parameter of the optical surface of 5th positive lens 11；It is the 4th negative
The design parameter of the optical surface of mirror 12.
1 Optical System Design parameter of table
Optical system mentioned in the embodiment of the present invention is using common optical glass or radiation resistance optical glass.Due to
Ionising radiation can make optical glass material generate absorption band in space, and a part of absorption band is located in visible spectrum,
Cause the transmissivity of optical glass to decay, thus the window mirror 1 of the object lens, the first negative lens 2 and the first positive lens 3 be all made of it is resistance to
Radio optics glass material: JGS1 (density 2.2g/cm2), LAK9G15 (density 3.43g/cm2), (density is LF5G15
3.23g/cm2).Radiation resistance optical glass can have under high-energy radiation (such as gamma-rays, x-ray and cosmic ray) effect
Certain anti-radiation stability, is mainly manifested in not easy coloring or dimmed.Wherein window mirror with a thickness of 5mm, first and second
The center thickness of lens is respectively 3.5mm and 4.51mm, is equivalent to and provides the equivalent aluminium of minimum 15mm for optical lens below
Thickness, the relationship between dose of radiation and shielding thickness absorbed according to the track of solid spherical model is it is found that when shielding equivalent aluminium
When thickness reaches 11mm, ionizing radiation dose is almost thus completely shielded.Therefore, the window mirror of the object lens, first and second are saturating
Mirror provides protection for remaining lens, and the anti-ionizing radiation performance of whole system is made to meet design specification.
Window mirror 1 and optical filter 6 select JGS1 glass；4th positive lens 9, the 5th positive lens 11 are dense-crown optical glass；The
Two negative lenses 5, third negative lens 8, the 4th negative lens 12 are attached most importance to flint optical glass.
Optical system focal length provided by the invention be 24mm, relative aperture F/2.2,600~800nm of service band, entirely
Field angle is 35 °.
Design result shows that provided optical system lens each visual field transmission function at 128lp/mm is all larger than 0.3,
Distortion value is 0.0072%.
A kind of high-resolution large-viewing-field ultra-low distortion optical system, Tolerance assignment parameter provided by the embodiment of the present invention
Table is as shown in table 2:
2 Tolerance assignment parameter list of table
Obtain that the results are shown in Table 3 by 50 Monte Carlo Analysis,
3 Monte Carlo TOLERANCE ANALYSIS result of table
The distortion value of the image-forming objective lens as Figure 3-Figure 4 is 0.0072%, the transmitting at spatial frequency 128lp/mm
Functional value is 0.44, meets index request, obtains preferable image quality, and aberration has obtained good correction, image quality very
It is good, achieve the purpose that design.
It is as shown in Figure 4 to cover MTF curve figure, it is seen that at spatial frequency 128lp/mm, probability of the mtf value 0.31 or more
Greater than 90%, meet technical requirement.
Those skilled in the art in the invention can also make appropriate changes and modifications to the above embodiments.Cause
This, the invention is not limited to the specific embodiments disclosed and described above, also answers some modifications and changes of the invention
When falling into the scope of the claims of the present invention.In addition, although being used some specific terms in this specification,
These terms are merely for convenience of description, does not limit the present invention in any way.
Claims (9)
1. a kind of high-resolution large-viewing-field ultra-low distortion optical system, the optical system sequentially includes window mirror by object side to image side
(1), the first negative lens (2), the first positive lens (3), the second positive lens (4), the second negative lens (5), optical filter (6), diaphragm
(7), third negative lens (8), third positive lens (9), the 4th positive lens (10), the 5th positive lens (11) and the 4th negative lens
(12)；Optical element is respectively positioned in same optical path, it is characterised in that: TTL/EFL≤4.9, wherein TTL is the optical system
For window mirror (1) object space side outermost point to the distance of imaging surface, EFL is the focal length of the optical system；0.42≥BFL/EFL≥
0.37, wherein BFL is distance of the 4th negative lens (12) the element image side outermost point of the optical system to imaging surface, EFL
For the focal length of the optical system.
2. high-resolution large-viewing-field ultra-low distortion optical system according to claim 1, it is characterised in that: the optical filter
(6) it is placed in inside optical system, and is placed in front of diaphragm (7)；Angle, θ≤10 ° of the reception light of the optical filter (6), θ are
The angle of light and optical filter (6) normal direction.
3. high-resolution large-viewing-field ultra-low distortion optical system according to claim 1, it is characterised in that: described second just
Lens (4) and the second negative lens (5) are using forming a lens subassembly, the convex surface of the faying face of two lens elements in conjunction with optical cement
Towards object space side；And second positive lens (4) and the second negative lens (5) element engaging face meet following condition formulas:
| R | Φ/2 >, wherein R is the center curvature radius of faying face, and Φ is the light effective aperture of faying face.
4. high-resolution large-viewing-field ultra-low distortion optical system according to claim 1, it is characterised in that: the window mirror
(1), the first negative lens (2) and the first positive lens (3) have been all made of anti-radiation optical glass material, remaining lens material is general
Logical glass.
5. high-resolution large-viewing-field ultra-low distortion optical system according to claim 4, it is characterised in that: the described 4th just
Lens (10), the 5th positive lens (11) are dense-crown optical glass；It is second negative lens (5), third negative lens (8), the 4th negative
Lens (12) are attached most importance to flint optical glass.
6. high-resolution large-viewing-field ultra-low distortion optical system according to claim 5, it is characterised in that: the described 4th just
Lens (10) contain high order aspheric surface.
7. high-resolution large-viewing-field ultra-low distortion optical system according to claim 1, it is characterised in that: described first
Negative lens (2) meets following condition formula:
Nd >=1.69, Vd >=54, wherein Nd indicates that the d optical index of the first negative lens (2) element material, Vd indicate that first is negative
The d light Abbe constant of mirror element material, d light is the visible light that wavelength is 588nm, and the first negative lens unit is towards the one side of object
For the convex surface for control system distortion size.
8. high-resolution large-viewing-field ultra-low distortion optical system according to claim 1 or claim 7, it is characterised in that: described
Four positive lens (10) meet following condition formula:
1.58≤Nd≤1.62,58≤Vd≤65
Wherein Nd indicates that the d optical index of the 4th positive lens (10) element material, Vd indicate the 4th positive lens (10) element material
D light Abbe constant, d light be wavelength be 588nm visible light；
5th positive lens (11) meets following condition formula:
1.55≤Nd≤1.65,65≤Vd≤70
Wherein Nd indicates that the d optical index of the 5th positive lens (11) element material, Vd indicate the 5th positive lens (11) element material
D light Abbe constant, d light be wavelength be 588nm visible light.
9. high-resolution large-viewing-field ultra-low distortion optical system according to claim 1 or claim 7, it is characterised in that:
Second negative lens (5) meets following condition formula:
1.75≤Nd≤1.85,25≤Vd≤28
Wherein Nd indicates that the d optical index of the second negative lens (5) element material, Vd indicate the d of the second negative lens (5) element material
Light Abbe constant, d light are the visible lights that wavelength is 588nm；
The third negative lens (8) meets following condition formula:
1.75≤Nd≤1.8,25≤Vd≤30
Nd >=1.76, Vd >=27.4, wherein Nd indicates that the d optical index of third negative lens (8) element material, Vd indicate that third is negative
The d light Abbe constant of lens (8) element material, d light are the visible lights that wavelength is 588nm；
4th negative lens (12) meets following condition formula:
1.75≤Nd≤1.8,25≤Vd≤30
Wherein Nd indicates that the d optical index of the 4th negative lens (12) element material, Vd indicate the 4th negative lens (12) element material
D light Abbe constant, d light be wavelength be 588nm visible light.
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| CN109884774A (en) * | 2019-04-22 | 2019-06-14 | 中科院南京天文仪器有限公司 | A kind of high-resolution large-viewing-field ultra-low distortion optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109884774A (en) * | 2019-04-22 | 2019-06-14 | 中科院南京天文仪器有限公司 | A kind of high-resolution large-viewing-field ultra-low distortion optical system |
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Effective date of registration: 20210119 Address after: No.23, Huashan Road, Gaochun County Development Zone, Gaochun District, Nanjing City, Jiangsu Province, 210008 Patentee after: CAS NANJING NAIRC PHOTOELECTRIC INSTRUMENT Co.,Ltd. Address before: 210042 no.6-10 Huayuan Road, Xuanwu District, Nanjing City, Jiangsu Province Patentee before: CAS NANJING ASTRONOMICAL INSTRUMENTS Co.,Ltd. |
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