CN104317040B - Uncooled high-zoom-ratio continuous-zooming optical system - Google Patents
Uncooled high-zoom-ratio continuous-zooming optical system Download PDFInfo
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- CN104317040B CN104317040B CN201310634946.9A CN201310634946A CN104317040B CN 104317040 B CN104317040 B CN 104317040B CN 201310634946 A CN201310634946 A CN 201310634946A CN 104317040 B CN104317040 B CN 104317040B
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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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
Abstract
The invention relates to an uncooled high-zoom-ratio continuous-zooming optical system comprising a first meniscus positive lens, a second dual-concave negative lens, a third dual-convex positive lens, a diaphragm, a fourth meniscus negative lens, a fifth meniscus positive lens, and a detector. The lenses are arranged successively and coaxially from the object space to the image space. The second dual-concave negative lens and the third dual-convex positive lens make reverse movement between the first meniscus positive lens and the diaphragm along the axial direction, thereby forming a narrow-view-field light path and a wide-view-field light path. According to the invention, on the basis of the continuous zooming principle of the mechanical compensating method, continuous zooming is realized based on the relative motion of the zoom group and the compensation group and the realized zoom ratio range is from 12 to 25 times. The aspheric surface is used for improving the image quality; and the total length of the light path of the continuous zooming optical system is shortened. Because of utilization of five lenses by the whole optical system, the optical system has the high transmittance and the solar energy utilization efficiency is high.
Description
Technical field
The invention belongs to optical technical field, is related to a kind of non-brake method high zoom ratio continuous zooming optical system.
Background technology
Infrared continuous vari-focus thermal imaging system be a kind of focal length can consecutive variations and image planes position keep stable and in zoom mistake
As good imaging system is held in quality guarantee in journey.Focus thermal infrared imager to be intended to obtain different size of picture in image planes, it is necessary to change
The camera lens of the distance between target object and camera lens or replacing different focal.And infrared continuous vari-focus thermal imaging system can continuously change
System focal, therefore, it can continuously be changed the target picture of size in image planes, for optical detection and reconnaissance, tracking etc.
It is all highly beneficial.
Uncooled IRFPA thermal infrared imager due to being not required to refrigeration and cheap, in electric power, fire-fighting, industry, medical treatment, security protection etc.
Civil area application is widely.Infrared optical system plays very important effect in non-brake method thermal imaging system, various
Monoscopic, double-view field, many visual fields, continuous magnification lens are widely applied.Wherein, uncooled IRFPA continuous magnification lens should
With particularly important.
Non-brake method high zoom ratio continuous zooming optical system is needed in military, police fields the application such as navigation, search, scouting
Ask widely.However, common uncooled IRFPA continuous magnification lens zoom ratio is between 4 to 5 times, it is difficult to meet use demand.
Chinese patent ZL201010516394.8 discloses a kind of non-brake method dual field-of-view infrared optical system, and the zoom lens of the system become
Multiple proportions is 3 times, and the zoom ratio scope of realization is usually 2～5 times；The system adopts axle of the image conjugate principle by Zoom lens
To the mobile switching for realizing wide, narrow visual field light path, theoretically, just only two positions can guarantee that blur-free imaging, it is impossible to real
Existing continuous vari-focus, hence it is evident that be difficult to meet the demand of high zoom ratio continuous vari-focus.
The content of the invention
It is an object of the invention to provide a kind of non-brake method high zoom ratio continuous zooming optical system, to realize optical system
High zoom ratio, continuous vari-focus.
For achieving the above object, non-brake method high zoom ratio continuous zooming optical system technical scheme of the invention is as follows：Bag
Include the first bent moon positive lens, the second double-concave negative lens, the 3rd biconvex positive lens, the light for sequentially coaxially arranging from the object side to the image side
Door screen, the 4th bent moon minus lenses, the 5th bent moon positive lens and detector, second double-concave negative lens, the 3rd biconvex positive lens edge
Axially move backward between the first bent moon positive lens and diaphragm, narrow visual field light path and wide visual field light path are respectively constituted, when mobile
Second double-concave negative lens and the 3rd biconvex positive lens need to meet following equation：
In formula, f2' for the second double-concave negative lens focal length, f3' for the 3rd biconvex positive lens focal length, β2s、β3sFor second
Double-concave negative lens, the 3rd biconvex positive lens wide visual field position multiplying power, β2、β3For second pair of any position during zoom
The multiplying power of recessed minus lenses, the 3rd biconvex positive lens.
Second double-concave negative lens to the first bent moon positive lens direction is moved, while the 3rd biconvex positive lens are to diaphragm side
Switching of the narrow visual field to wide visual field light path is realized to movement；Second biconcave lenss to diaphragm direction is moved, while the 3rd biconvex is just
Lens towards the second biconcave lenss direction movement realizes wide visual field to narrow visual field light path.
It is narrow visual field light path that second double-concave negative lens are in system when A ' puts in A points, the 3rd biconvex positive lens, the
One bent moon positive lens and the second double-concave negative lens interval 197.1mm, the second double-concave negative lens and the 3rd biconvex positive lens interval
19.5mm, the 3rd biconvex positive lens and diaphragm 4 interval 35mm；Second double-concave negative lens are in B points, the 3rd biconvex positive lens
System is wide visual field light path when B ' puts, and the first bent moon positive lens are negative saturating with the second double-concave negative lens interval 38.3mm, the second concave-concave
Mirror and the 3rd biconvex positive lens interval 211.8mm, the 3rd biconvex positive lens and the interval of diaphragm 4 1.5mm；The bent moon of diaphragm 4 and the 4th
Minus lenses interval 18.3mm, the 4th bent moon minus lenses and the 5th bent moon positive lens interval 40.8mm, the 5th bent moon positive lens and spy
Survey device protecting window interval 12mm.
The narrow visual field focal length be 200mm, wide visual field focal length be 10.7mm, 18 times of zoom ratio.
The non-brake method high zoom ratio continuous zooming optical system of the present invention, using mechanical compensation method continuous vari-focus principle, leads to
Zoom group is crossed with the relative motion of compensation group to realize continuous vari-focus, the zoom ratio scope that can be realized is 12～25 times；Using
Aspheric surface makes the light path overall length of continuous zooming optical system shorter improving as matter；The optical system of the present invention has high
Zoom ratio and continually varying optical field of view, most wide optical field of view is used for the detection of target, and minimum optical field of view is used for target
Identification；Using aspheric design so that the degree of freedom of continuous zooming optical system design becomes big, and optimized design is optional
The variable selected increases so that optical aberration design easily reaches good results, obtains excellent picture matter；Due to whole optical system
System use only 5 pieces of lens, and optical system has very high transmitance, and the efficiency of light energy utilization is high.
Description of the drawings
Fig. 1 is the narrow visual field light path figure of embodiment；
Fig. 2 is the middle visual field a index paths of embodiment；
Fig. 3 is the middle visual field b index paths of embodiment；
Fig. 4 is the wide visual field light path figure of embodiment.
Specific embodiment
As Figure 1-4, non-brake method zoom ratio continuous vari-focus infrared optical system is included from the object side to the image side sequentially coaxially
The first bent moon positive lens for arranging（Object lens）1st, the second double-concave negative lens（Zoom lens）2nd, the 3rd biconvex positive lens（Compensation is saturating
Mirror）3rd, diaphragm 4, the 4th bent moon minus lenses（Collecting lenses）5th, the 5th bent moon positive lens（Collecting lenses）6 and detector 7, second
Double-concave negative lens 2, the 3rd biconvex positive lens 3 are moved backward vertically between the first bent moon positive lens 1 and diaphragm 4, respectively structure
Into narrow visual field light path and wide visual field light path.Optical system design parameter is as shown in table 1.
The optical system parameter table of table 1
The aspheric that the rear surface of the front surface of the second lens, the front surface of the 3rd lens and the 5th lens is adopted in upper table
Face face type equation is：
Wherein z (r) is aspheric face type function；R is the axial radial coordinate of vertical light；K is circular cone coefficient；R is sphere
The radius of curvature of apex；A is quadravalence asphericity coefficients；B is six rank asphericity coefficients；C is eight rank asphericity coefficients；D is ten
Rank asphericity coefficients.
The shifting of the second double-concave negative lens and the 3rd biconvex positive lens in non-brake method zoom ratio continuous vari-focus infrared optical system
It is dynamic must to be fulfilled for certain functional relationship, understand that the second double-concave negative lens and the 3rd biconvex positive lens are necessary by theory of geometric optics
Meet following equation：
In formula, f2' for the second double-concave negative lens focal length, f3' for the 3rd biconvex positive lens focal length, β2s、β3sFor second
Double-concave negative lens, the 3rd biconvex positive lens wide visual field position multiplying power, β2、β3For second pair of any position during zoom
The multiplying power of recessed minus lenses, the 3rd biconvex positive lens.The zoom ratio scope that the optical system can be realized is 12～25 times.
As shown in figure 1, when the second double-concave negative lens 2 constitute optics in A points, the 3rd biconvex positive lens 3 when putting in A '
System narrow visual field light path, the first bent moon positive lens 1 and the interval of the second double-concave negative lens 2 197.1mm, the second double-concave negative lens 2 with
The interval of 3rd biconvex positive lens 3 19.5mm, the 3rd biconvex positive lens 3 are spaced 35mm with diaphragm 4；As in Figure 2-4, when second pair
Recessed minus lenses 2 to the direction of the first bent moon positive lens 1 is moved, while the 3rd biconvex positive lens 3 are moved to the direction of diaphragm 4, second pair
Recessed minus lenses 2 in B points, the 3rd biconvex positive lens 3 in B ' put when constitute optical system wide visual field light path, realize narrow visual field to
The switching of wide visual field light path, now the first bent moon positive lens 1 and the interval of the second double-concave negative lens 2 38.3mm, the second concave-concave are negative saturating
Mirror 2 and the interval of the 3rd biconvex positive lens 3 211.8mm, the 3rd biconvex positive lens 3 are spaced 1.5mm with diaphragm 4；Diaphragm 4 is curved with the 4th
Moon minus lenses 5 interval 18.3mm, the 4th bent moon minus lenses 5 and the interval of the 5th bent moon positive lens 6 40.8mm, the 5th bent moon positive lens
6 are spaced 12mm with the protecting window of detector 7.When the second biconcave lenss 2 are moved to the direction of diaphragm 4, while the 3rd biconvex positive lens 3
Towards the movement of the direction of the second biconcave lenss 2, and the second double-concave negative lens 2 in A points, the 3rd biconvex positive lens 3 in A ' put when,
Visual field returns to narrow visual field light path, and image remains clear in whole zooming procedure.
Narrow visual field focal length be 200 ㎜, wide visual field focal length be 10.7mm, 18 times of zoom ratio.System adopts Polaroid side
Formula；The face of system first to the axial space length of detector protective glass is 340mm.F numbers：1.2；Distortion≤5% in full filed.
Applicable detector is pixel count 320 × 240, the non-brake method LONG WAVE INFRARED focus planardetector of 25 μm of pixel size, is suitable for ripple
It is long：8 μm～14 μm；Centre wavelength：10μm；Effective imaging area：8mm×6mm；It is germanium that protective glass thickness is 1mm materials；Away from
Protective glass 1.9mm is detector image planes.
It should be noted last that：Above example only with illustrate and not to limit technical scheme, although ginseng
The present invention has been described in detail according to above-described embodiment, it will be understood by those within the art that；Still can be to this
Invention is modified or equivalent, any modification or partial replacement without departing from the spirit and scope of the present invention, and its is equal
Should cover in the middle of scope of the presently claimed invention.
Claims (4)
1. non-brake method high zoom ratio continuous zooming optical system, it is characterised in that：Including sequentially coaxially arranging from the object side to the image side
The first bent moon positive lens, the second double-concave negative lens, the 3rd biconvex positive lens, diaphragm, the 4th bent moon minus lenses, the 5th bent moon just
Lens and detector, second double-concave negative lens, the 3rd biconvex positive lens vertically the first bent moon positive lens and diaphragm it
Between move backward, respectively constitute narrow visual field light path and wide visual field light path, when in narrow visual field light path state, the second concave-concave is negative saturating
Between optics of the optical interval of mirror and the first bent moon positive lens for 197.1mm, the 3rd biconvex positive lens and the first bent moon positive lens
It is divided into 219.6mm；When in wide visual field light path state, the second double-concave negative lens are with the optical interval of the first bent moon positive lens
The optical interval of 38.3mm, the 3rd biconvex positive lens and the first bent moon positive lens is 253.1mm, the second double-concave negative lens when mobile
Need to meet following equation with the 3rd biconvex positive lens：
In formula, f2' for the second double-concave negative lens focal length, take -41mm；f3' for the 3rd biconvex positive lens focal length, take 46.6mm；
β2s、β3sFor the second double-concave negative lens, the 3rd biconvex positive lens wide visual field position multiplying power；β2、β3For arbitrary during zoom
Second double-concave negative lens of position, the multiplying power of the 3rd biconvex positive lens.
2. non-brake method high zoom ratio continuous zooming optical system according to claim 1, it is characterised in that：Distance first is curved
Second double-concave negative lens of month plus lens optical interval 197.1mm are moved to the first bent moon positive lens direction, while distance first
3rd biconvex positive lens of bent moon positive lens optical interval 219.6mm to diaphragm direction movement realizes narrow visual field to wide visual field light path
Switching；Second double-concave negative lens of distance the first bent moon positive lens optical interval 38.3mm to diaphragm direction is moved, while away from
The 3rd biconvex positive lens from the first bent moon positive lens optical interval 253.1mm are realized towards the movement of the second double-concave negative lens direction
Switching of the wide visual field to narrow visual field light path.
3. non-brake method high zoom ratio continuous zooming optical system according to claim 1, it is characterised in that：Described second pair
Recessed minus lenses in A points and the 3rd biconvex positive lens in A ' put when system be narrow visual field light path, the first bent moon positive lens and the
Two double-concave negative lens interval 197.1mm, the second double-concave negative lens are just saturating with the 3rd biconvex positive lens interval 19.5mm, the 3rd biconvex
Mirror is spaced 35mm with diaphragm (4)；Second double-concave negative lens are in B points and the 3rd biconvex positive lens are in system when B ' puts and regard for width
Field light path, the first bent moon positive lens are just saturating with the 3rd biconvex with the second double-concave negative lens interval 38.3mm, the second double-concave negative lens
Mirror interval 211.8mm, the 3rd biconvex positive lens and diaphragm (4) interval 1.5mm；Diaphragm (4) is spaced with the 4th bent moon minus lenses
18.3mm, the 4th bent moon minus lenses and the 5th bent moon positive lens interval 40.8mm, the 5th bent moon positive lens and detector protection window
Mouth interval 12mm.
4. non-brake method high zoom ratio continuous zooming optical system according to claim 3, it is characterised in that：The narrow visual field
Focal length be 200mm, wide visual field focal length be 10.7mm, 18 times of zoom ratio.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310634946.9A CN104317040B (en) | 2013-11-28 | 2013-11-28 | Uncooled high-zoom-ratio continuous-zooming optical system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310634946.9A CN104317040B (en) | 2013-11-28 | 2013-11-28 | Uncooled high-zoom-ratio continuous-zooming optical system |
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| CN104317040A CN104317040A (en) | 2015-01-28 |
| CN104317040B true CN104317040B (en) | 2017-05-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106680981B (en) * | 2016-11-20 | 2019-01-08 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of more visual field optical systems of broadband |
| CN106526818B (en) * | 2016-12-06 | 2018-11-16 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared continuous zooming optical system of three-group linkage compact high zoom ratio |
| CN107121765B (en) * | 2017-04-10 | 2022-11-08 | 凯迈（洛阳）测控有限公司 | Uncooled double-view-field infrared optical system and optical lens applying same |
| CN114594583B (en) * | 2022-02-28 | 2023-08-15 | 深圳市誉和光学精密刀具有限公司 | Infrared continuous zooming optical system |
| CN115166955B (en) * | 2022-07-19 | 2023-06-02 | 凯迈（洛阳）测控有限公司 | Radiation-proof uncooled infrared continuous zooming optical system and optical lens |
| CN116224559A (en) * | 2022-12-19 | 2023-06-06 | 湖北华鑫光电有限公司 | Zoom 5p 5000 ten thousand pixel lens |
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| CN102062932A (en) * | 2010-10-22 | 2011-05-18 | 中国航空工业集团公司洛阳电光设备研究所 | Uncooled double-field-of-view infrared optical system |
| CN103048775A (en) * | 2013-01-21 | 2013-04-17 | 凤凰光学(广东)有限公司 | Zoom optical system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011013578A (en) * | 2009-07-03 | 2011-01-20 | Sony Corp | Zoom lens, camera module and electronic equipment |
| JP5543838B2 (en) * | 2010-04-27 | 2014-07-09 | パナソニック株式会社 | Zoom lens system, imaging device and camera |
| JP5804859B2 (en) * | 2011-09-08 | 2015-11-04 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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- 2013-11-28 CN CN201310634946.9A patent/CN104317040B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062932A (en) * | 2010-10-22 | 2011-05-18 | 中国航空工业集团公司洛阳电光设备研究所 | Uncooled double-field-of-view infrared optical system |
| CN103048775A (en) * | 2013-01-21 | 2013-04-17 | 凤凰光学(广东)有限公司 | Zoom optical system |
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