CN106526818B - A kind of infrared continuous zooming optical system of three-group linkage compact high zoom ratio - Google Patents
A kind of infrared continuous zooming optical system of three-group linkage compact high zoom ratio Download PDFInfo
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- CN106526818B CN106526818B CN201611106115.4A CN201611106115A CN106526818B CN 106526818 B CN106526818 B CN 106526818B CN 201611106115 A CN201611106115 A CN 201611106115A CN 106526818 B CN106526818 B CN 106526818B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/15—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
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Abstract
The present invention relates to a kind of infrared continuous zooming optical systems of three-group linkage compact high zoom ratio, zoom group, compensation group three-group linkage are realized using double compensation group design method, realize big zoom ratio, by using aspherical, diffraction surfaces, it reduces senior aberration, point and off-axis point aberration, light pencil and angle pencil of ray aberration, various color difference and compress axial space on axis, satisfied image quality is obtained in full filed and full aperture.Advantage：Realize 30 times of optics continuous vari-focus, focal length can consecutive variations, can get continuously become larger, the image that reduces and image planes position keep stablizing, image quality holding is well in zooming procedure.Entire optical system axial direction length is short, and only 180mm shortens nearly 60% than similar optical system length.It is designed using aspherical, diffraction surfaces, so that the freedom degree of continuous zooming optical system design becomes larger, the selectable variable of optimized design increases, so that optical aberration design easily reaches good results, obtains excellent image quality.
Description
Technical field
The invention belongs to infrared optical systems, are related to a kind of infrared continuous zooming optical of three-group linkage compact high zoom ratio
System, the infrared continuous zooming optical system of three-group linkage compact high zoom ratio applied to dual-use field.
Background technique
Infrared continuous vari-focus thermal imaging system be a kind of focal length can consecutive variations and image planes position keeps stablizing and in zoom mistake
Image quality keeps good imaging system in journey.Fixed-focus thermal infrared imager is intended to obtain different size of picture in image planes, it is necessary to change
The distance between target object and camera lens or the camera lens for replacing different focal length.And infrared continuous vari-focus thermal imaging system can continuously change
Therefore system focal length can obtain the target picture for continuously changing size, for optical detection and reconnaissance, tracking etc. in image planes
It is all highly beneficial.
Common infrared continuous zoom lens zoom ratio is between 10 to 20 times and axial dimension is too long, it usually needs logical
It crosses plane mirror to turn back optical path, spatial volume is big.It is difficult to meet high zoom ratio, the actual use demand of small size.High zoom
Than, compact continuous zooming optical system navigation, search, scouting etc. be military, police fields application demands are very extensive.
Summary of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes a kind of infrared company of three-group linkage compact high zoom ratio
Continuous varifocal optical system.
Technical solution
A kind of infrared continuous zooming optical system of three-group linkage compact high zoom ratio, it is characterised in that including narrow visual field light
Road, middle visual field optical path and wide visual field light path；The composition of narrow visual field light path is：By optical path trend be followed successively by object lens 1, Zoom lens 2,
First compensation lens 3, second compensate lens 4 and convergent lens group 5；The convergent lens group 5 includes the first meeting being arranged successively
Poly- lens 5-1, the second convergent lens 5-2 and third convergent lens 5-3；Axial space of first optical surface to a last optical surface
Length is 180mm；Change the mutual spacer thickness that Zoom lens 2, first compensate lens 3 and the second compensation lens 4 along optical axis,
It can obtain including narrow visual field light path, intermediate visual field optical path to the infrared continuous zooming optical system of the high zoom ratio of wide visual field light path
System, the infrared continuous zooming optical system of three-group linkage compact high zoom ratio can reach 30 times of optics continuous vari-focus.
It is equipped with detector 6 after 5 optical path of convergent lens group and constitutes the infrared continuous change of three-group linkage compact high zoom ratio
Focus optical devices.
The F number of the detector is 5.5, and the detector is pixel number 320 × 240,30 μm of pixel size of focal plane
Detector or pixel number 640 × 480,15 μm of pixel size of focus planar detector；Its applicable wavelengths：3 μm~5 μm.
When the compensation lens 3 of Zoom lens 2, first and the second compensation lens 4 are located at A1、B1And C1When position, constitute burnt
Away from the narrow visual field light path for 687.5 ㎜；87mm is divided between object lens 1 and Zoom lens 2, between Zoom lens 2 and the first compensation lens 3
It is divided into 4mm, 25mm is divided between the first compensation lens 3 and the second compensation lens 4, the second compensation lens 4 and convergence lens group 5 are spaced
For 0.5mm.
When the compensation lens 3 of Zoom lens 2, first and the second compensation lens 4 are located at A2、B2And C2When position, constitute burnt
Away from for 22.4mm wide visual field light path；It is divided into 8mm between object lens 1 and Zoom lens 2, is divided between Zoom lens 2 and the first compensation lens 3
101mm is divided into 4mm, is divided between the second compensation lens 4 and convergence lens group 5 between the first compensation lens 3 and the second compensation lens 4
3.5mm。
The object lens 1, Zoom lens 2, first compensate lens 3, second and compensate lens 4 and 5 material mating of convergent lens group
It is monocrystalline silicon for object lens 1 and the first compensation lens 3；Zoom lens 2, second compensate lens 4, the first convergent lens 5-1 and third
Convergent lens 5-3 is monocrystalline germanium；Second convergent lens 5-2 is zinc sulphide.
Beneficial effect
A kind of infrared continuous zooming optical system of three-group linkage compact high zoom ratio proposed by the present invention, using double compensation
Group design method realizes zoom group, compensation group three-group linkage, realizes big zoom ratio, by using aspherical, diffraction surfaces, reduces high
Grade aberration point and off-axis point aberration, light pencil and angle pencil of ray aberration, various color difference and compresses axial space on axis, in full filed
With satisfied image quality is obtained in full aperture.
Advantages of the present invention：
1 high zoom ratio continuous vari-focus：Realize 30 times of optics continuous vari-focus, focal length can consecutive variations, can get continuous become
Greatly, the image reduced and image planes position keep stablizing, and image quality keeps good in zooming procedure.
2 configuration compacts：Entire optical system axial direction length is short, and only 180mm is shortened closely than similar optical system length
60%.
3 image quality are excellent：It is designed using aspherical, diffraction surfaces, so that the freedom degree of continuous zooming optical system design becomes
Greatly, the selectable variable of optimized design increases, so that optical aberration design easily reaches good results, obtains
Excellent image quality.
Detailed description of the invention
Fig. 1 is prior art light path schematic diagram of the present invention；
Fig. 2 is narrow visual field light path schematic diagram of the present invention；
Fig. 3 is the intermediate visual field light path schematic diagram a of the present invention；
Fig. 4 is the intermediate visual field light path schematic diagram b of the present invention；
Fig. 5 is the intermediate visual field light path schematic diagram c of the present invention；
Fig. 6 is wide visual field light path schematic diagram of the present invention.
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described：
Varifocal optical system is by first fixed group, zoom group, five groups of the 1st compensation group, the 2nd compensation group and rear fixed group lens groups
At the core of zoom system is the change of movable lens group multiplying power.By using aspherical, diffraction surfaces in design, reduce
Point and off-axis point aberration, light pencil and angle pencil of ray aberration, various color difference in senior aberration, axis, in full filed, full aperture, full change
Satisfied image quality is obtained in burnt range.
Preceding fixed group is object lens 1, and zoom group is that the 2, the 1st compensation group of Zoom lens is the first compensation lens 3, the 2nd compensation group
For the second compensation lens 4, rear fixed group is that convergent lens group 5 forms light path system；Detector 6, structure are equipped with after convergent lens group 5
At the infrared continuous zooming optical detector of three-group linkage compact high zoom ratio.
Successively include object lens 1 by optical path trend, Zoom lens 2, compensation lens 3, compensation lens 4, convergent lens group 5, visit
Device 6 is surveyed to form.When Zoom lens 2, compensation lens 3, compensation lens 4 are in diagram A1、B1And C1When position, optical system is constituted
Narrow visual field light path.When Zoom lens 2, compensation lens 3, compensation lens 4 are axially moveable, in diagram A2、B2And C2When position,
Constitute optical system wide visual field light path.Diagram A is returned to when Zoom lens 2, compensation lens 3, compensation lens 4 are axially moveable1、B1
And C1When position, visual field returns to narrow visual field light path.Image remains clear in entire zooming procedure.
The A1、B1And C1When position, 87mm, Zoom lens 2 and the first compensation lens are divided between object lens 1 and Zoom lens 2
It is divided into 4mm between 3,25mm, the second compensation lens 4 and convergence lens group 5 are divided between the first compensation lens 3 and the second compensation lens 4
Between be divided into 0.5mm.
The A2、B2And C2When position, 8mm, Zoom lens 2 and the first compensation lens 3 are divided between object lens 1 and Zoom lens 2
Between be divided into 101mm, be divided into 4mm between the first compensation lens 3 and the second compensation lens 4, the second compensation lens 4 and assemble lens group 5
Between be divided into 3.5mm；
When the mutual spacer thickness for changing the compensation lens 3 of Zoom lens 2, first and the second compensation lens 4 along optical axis, and
Not comprising A1、B1And C1Position and A2、B2And C2When position, the intermediate visual field optical path of continuous vari-focus can be obtained, see Fig. 3, Fig. 4 and
Fig. 5.
Specific optical parameter see the table below shown：
External scene radiation focuses on spy through object lens 1, Zoom lens 2, compensation lens 3, compensation lens 4, convergent lens group 5
It surveys on 6 focal plane of device.When Zoom lens 2, compensation lens 3, compensation lens 4 are in the diagram position A1B1C1, optical system is constituted
System narrow visual field light path.When Zoom lens 2, compensation lens 3, compensation lens 4 are axially moveable, when in the diagram position A2B2C2,
Constitute optical system wide visual field light path.When Zoom lens 2, compensation lens 3, compensation lens 4 are axially moveable and return to diagram
When the position A1B1C1, visual field returns to narrow visual field light path.Image remains clear in zooming procedure.
Narrow visual field focal length is 687.5 ㎜, wide visual field focal length 22.4mm, 30 times of zoom ratio；System is using secondary imaging
Mode；The axial space length of the first optical surface of system to a last optical surface is 180mm.F number：5.5；Distort in full filed≤
5%.It is further characterized in that：Its applicable detector is pixel number 320 × 240,30 μm of pixel size of medium-wave infrared focal plane
Detector or pixel number 640 × 480,15 μm of pixel size of medium-wave infrared focus planar detector, applicable wavelengths：3 μm~5 μm；
The effective imaging area in center：9.6mm×7.2mm；It is monocrystalline silicon that protection thickness of glass, which is 1mm material,；Away from protection glass 22.75mm
For detector image planes.
Claims (6)
1. a kind of infrared continuous zooming optical system of three-group linkage compact high zoom ratio, it is characterised in that including narrow visual field light
Road, middle visual field optical path and wide visual field light path；The composition of narrow visual field light path is：Object lens (1), Zoom lens are followed successively by by optical path trend
(2), the first compensation lens (3), the second compensation lens (4) and convergent lens group (5)；The convergent lens group (5) includes successively
The first convergent lens (5-1), the second convergent lens (5-2) and the third convergent lens (5-3) of arrangement；First optical surface is to the end
The axial space length of one optical surface is 180mm；Change Zoom lens (2), the first compensation lens (3) and the second compensation along optical axis
The mutual spacer thickness of lens (4), can obtain include narrow visual field light path, intermediate visual field optical path to wide visual field light path height become
The infrared continuous zooming optical system of multiple proportions, the infrared continuous zooming optical system of three-group linkage compact high zoom ratio can reach
To 30 times of optics continuous vari-focus.
2. the infrared continuous zooming optical system of three-group linkage compact high zoom ratio according to claim 1, it is characterised in that：
It is equipped with detector (6) after convergent lens group (5) optical path and constitutes the infrared zoom optics of three-group linkage compact high zoom ratio
Learn device.
3. the infrared continuous zooming optical system of three-group linkage compact high zoom ratio according to claim 2, it is characterised in that：
The F number of the detector be 5.5, the detector be pixel number 320 × 240,30 μm of pixel size of focus planar detector or
Pixel number 640 × 480,15 μm of pixel size of focus planar detector；Its applicable wavelengths：3 μm~5 μm.
4. the infrared continuous zooming optical system of three-group linkage compact high zoom ratio according to claim 1 or claim 2, feature exist
In：When Zoom lens (2), the first compensation lens (3) and the second compensation lens (4) are located at A1、B1And C1When position, constitute
Focal length is the narrow visual field light path of 687.5 ㎜；87mm is divided between object lens (1) and Zoom lens (2), Zoom lens (2) are mended with first
It repays and is divided into 4mm between lens (3), 25mm is divided between the first compensation lens (3) and the second compensation lens (4), second compensates lens (4)
0.5mm is divided between convergence lens group (5).
5. the infrared continuous zooming optical system of three-group linkage compact high zoom ratio according to claim 1 or claim 2, feature exist
In：When Zoom lens (2), the first compensation lens (3) and the second compensation lens (4) are located at A2、B2And C2When position, constitute
Focal length is 22.4mm wide visual field light path；8mm is divided between object lens (1) and Zoom lens (2), Zoom lens (2) and the first compensation are saturating
Be divided into 101mm between mirror (3), be divided into 4mm between the first compensation lens (3) and the second compensation lens (4), the second compensation lens (4) and
Convergent lens group is divided into 3.5mm between (5).
6. the infrared continuous zooming optical system of three-group linkage compact high zoom ratio according to claim 1 or claim 2, feature exist
In：The object lens (1), Zoom lens (2), the first compensation lens (3), second compensation lens (4) and convergent lens group (5) material
It is monocrystalline silicon with object lens (1) and the first compensation lens (3) are combined into；Zoom lens (2), the second compensation lens (4), first are assembled thoroughly
Mirror (5-1) and third convergent lens (5-3) are monocrystalline germanium；Second convergent lens (5-2) is zinc sulphide.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107907977B (en) * | 2017-10-24 | 2020-02-14 | 中国航空工业集团公司洛阳电光设备研究所 | Double-zoom-segment optical system applied to photoelectric detection field |
| CN109839731B (en) * | 2017-11-28 | 2023-09-08 | 中国航空工业集团公司洛阳电光设备研究所 | Continuous zooming small-view-field high-speed peripheral infrared optical system |
| CN109974861B (en) * | 2019-03-28 | 2020-09-22 | 西安应用光学研究所 | Scene self-adaption based non-uniform correction method for infrared photoelectric sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB8315878D0 (en) * | 1983-06-09 | 1983-07-13 | Barr & Stroud Ltd | Zoom lens assembly |
| IL89301A (en) * | 1989-02-15 | 1993-04-04 | Electro Optics Ind Ltd | Zoom system |
| CN202975461U (en) * | 2012-12-07 | 2013-06-05 | 河北汉光重工有限责任公司 | Compact type continuous zooming optical lens with wide spectrum |
| CN103389570B (en) * | 2013-07-23 | 2015-06-10 | 中国科学院长春光学精密机械与物理研究所 | Medium wave infrared continuous zooming optical system with high zoom ratio |
| CN104317040B (en) * | 2013-11-28 | 2017-05-03 | 中国航空工业集团公司洛阳电光设备研究所 | Uncooled high-zoom-ratio continuous-zooming optical system |
| CN104297923A (en) * | 2013-11-28 | 2015-01-21 | 中国航空工业集团公司洛阳电光设备研究所 | Two-component three-field infrared optical system and field conversion method thereof |
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