CN106342261B - A kind of infrared variable focal length optical system - Google Patents
A kind of infrared variable focal length optical systemInfo
- Publication number
- CN106342261B CN106342261B CN201010049677.6A CN201010049677A CN106342261B CN 106342261 B CN106342261 B CN 106342261B CN 201010049677 A CN201010049677 A CN 201010049677A CN 106342261 B CN106342261 B CN 106342261B
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- China
- Prior art keywords
- lens
- focal length
- mirror
- variable focal
- curvature
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Abstract
The present invention relates to a kind of powerful infrared variable focal length optical system. Described infrared variable focal length optical system comprises an objective with variable focal length mirror group and a secondary imaging mirror group, and wherein, objective with variable focal length mirror group is disposed with large object lens, zoom mirror, compensating glass group, rear fixed mirror along optical axis. Described secondary imaging mirror group is disposed with secondary imaging front lens, secondary imaging rear lens along optical axis. The present invention is directed to refrigeration-type 320 × 256 gazing type infrared focal plane detectors and can realize the continuous vari-focus of 10 times, adopt monocrystalline silicon and two kinds of common infrared optical materials of monocrystalline germanium, introduce aspheric surface design and realize high-performance, high-quality optical imagery. And by without thermalization design, in the time that service band is 3.7 μ m～4.8 μ m, can normally work at-40 DEG C～+ 60 DEG C ambient temperature ranges, have a wide range of applications in the military domain such as navigation, search, warning, investigation and civil area.
Description
Technical field
The present invention relates to a kind of powerful infrared variable focal length optical system.
Background technology
The range of application of infra-red thermal imaging system is increasingly extensive, and importance day is aobvious outstanding, extensively usesIn multiple fields such as national defence, public security, industrial detection, aspect civil and military, have extremely importantUsing value. Wherein infrared optical system is the core component of infrared thermography, directly impactThe performance of whole system. Thereby infrared variable focal length optical system can change focal length within the specific limitsCan obtain the angle of visual field of different sizes, the target image of different sizes and different scenery scopes.Along with the continuous expansion of tremendous development and the range of application thereof of infrared optics technology, to infrared varifocalThe demand of optical system strengthens day by day.
Therefore, under the advantage of powerful Zoom infrared optical system is presented as in working order,Lose objects information not in the process of zoom, this is for as catching and follow the tracks of the red of useOuter variable focal length optical system is particularly important.
Summary of the invention
The object of the invention is: the invention provides one and there is high zoom, high light transmission rate, one-tenthThe infrared variable focal length optical system that image quality is good.
Technical scheme of the present invention is: a kind of infrared variable focal length optical system, it comprises a zoomApart from object lens mirror group and secondary imaging mirror group and image planes, wherein, described objective with variable focal length mirror groupBe disposed with large object lens, zoom mirror, compensating glass group, rear fixed mirror along optical axis, described secondary becomesBe disposed with secondary imaging front lens, secondary imaging rear lens as mirror group along optical axis.
Described large object lens, zoom mirror, compensating glass group, rear fixed mirror divide the contribution of system focal powerWei be not positive and negative, just, positive form, wherein, negative constituent element zoom, positive constituent element compensation.
Described large object lens are positive lens, and its optical parametric radius of curvature is front surface 118mm, rear tableFace 198mm, center thickness is 15mm, is made up of single crystal silicon material.
Described zoom mirror is negative lens, and its optical parametric radius of curvature is front surface-650mm, rear tableFace-85mm, center thickness is 3mm, is made up of monocrystalline germanium material.
Described compensating glass group is positive lens mirror group, and it is by coaxial positive convex lens and negative concavees lensComposition, wherein, the optical parametric radius of curvature of positive convex lens is front surface-49mm, rear surface380mm, center thickness is 6mm, is made up of single crystal silicon material. The optical parametric song of negative concavees lensRate radius is front surface 74mm, rear surface 36mm, and center thickness is 6mm, by monocrystalline germanium materialMaterial composition.
Described rear fixed mirror is positive lens, and its optical parametric radius of curvature is front surface 18mm, rear tableFace-22mm, center thickness is 6mm, is made up of, further the field of corrective system monocrystalline germanium materialBent, aberration.
Described secondary imaging front lens is positive convex lens, and its optical parametric radius of curvature is front surface58mm, rear surface 62mm, center thickness is 3mm, is made up of monocrystalline germanium material, focal length is about
38mm。
Described secondary imaging rear lens is positive convex lens, and its optical parametric radius of curvature is front surface-30.6mm, rear surface-49.62mm, center thickness is 3mm, is made up of Jiao monocrystalline germanium materialApart from being about 20mm.
The invention has the beneficial effects as follows: the powerful infrared variable focal length optical system of the present invention is by becomingThe design of focal length objective lens mirror group and the each lens surface curvature radius of secondary imaging mirror, its optical transmittanceHeight, focal length variations scope is large, can for refrigeration-type 320 × 256 gazing type infrared focal plane detectorsTo realize the continuous vari-focus of 10 times. And employing monocrystalline silicon and two kinds of common infrared optics materials of monocrystalline germaniumMaterial, introduces aspheric surface design and realizes high-performance, high imaging quality, navigation, search, warning,The military domain such as investigation and civil area will be widely used.
Figure of description
Fig. 1 is the index path of infrared variable focal length optical system one preferred embodiments of the present invention,
Wherein, fixed mirror, 5-secondary imaging after the large object lens of 1-, 2-zoom mirror, 3-compensating glass, 4-Front lens, 6-secondary imaging rear lens, 7-image planes.
Detailed description of the invention
Below by specific embodiment, the present invention is described in further detail:
Refer to Fig. 1, it is the light path of infrared variable focal length optical system one preferred embodiments of the present inventionFigure. Described infrared variable focal length optical system comprises an objective with variable focal length mirror group and a secondary imagingMirror group and image planes 7, shared 7 lens.
Wherein, described objective with variable focal length mirror group along optical axis be disposed with large object lens 1, zoom mirror 2,Compensating glass group 3, rear fixed mirror 4. Described secondary imaging mirror group is disposed with secondary imaging along optical axisFront lens 5, secondary imaging rear lens 6.
Described large object lens 1 are positive lens, its optical parametric radius of curvature be front surface 118mm, afterSurface 198mm, center thickness is 15mm, is made up of single crystal silicon material, will be from measured targetThe infrared beam of radiation is assembled and is entered in native system.
Described zoom mirror 2 is negative lens, its optical parametric radius of curvature be front surface-650mm, afterSurface-85mm, center thickness is 3mm, is made up of monocrystalline germanium material, realizes achromatism, simultaneouslyBe conducive to control and proofread and correct the curvature of field and astigmatism, change the focal length of whole system by its movement.
Described compensating glass group 3 is positive lens mirror group, and it is by coaxial positive convex lens and negative recessedMirror composition, correspondingly does small compensation by it along optical axis and moves, thereby the system of guarantee image planes is steadyFixed. Wherein, the optical parametric radius of curvature of positive convex lens is front surface-49mm, rear surface 380mm,Center thickness is 6mm, is made up of single crystal silicon material. The optical parametric radius of curvature of negative concavees lens isFront surface 74mm, rear surface 36mm, center thickness is 6mm, is made up of monocrystalline germanium material.
Described rear fixed mirror 4 is positive lens, its optical parametric radius of curvature be front surface 18mm, afterSurface-22mm, center thickness is 6mm, formed by monocrystalline germanium material, further corrective systemThe curvature of field, aberration.
Described secondary imaging front lens 5 is positive convex lens, and its optical parametric radius of curvature is front tableFace 58mm, rear surface 62mm, center thickness is 3mm, is made up of focal length monocrystalline germanium materialBe about 38mm.
Described secondary imaging rear lens 6 is positive convex lens, and its optical parametric radius of curvature is front tableFace-30.6mm, rear surface-49.62mm, center thickness is 3mm, formed by monocrystalline germanium material,Focal length is about 20mm.
Described Infrared Detectors 7 is to improve infrared system heat sensitivity, spatial resolution and effect distanceFrom key factor, select France 320 × 256 gazing type medium-wave infrared focus planardetector conductsThe detector of native system.
The arrogant object lens 1 of infrared zoom optical system of the present invention are by the infrared beam meeting from measured targetPoly-entering in native system, then changes system focal length by the movement of zoom mirror 2, proofread and correct the curvature of field andAstigmatism, then compensate to ensure the stable of image planes by compensating glass group 3. Then by rear fixed mirror 4Further the curvature of field and the aberration of corrective system, be imaged in image planes 7 finally by secondary imaging mirror group.
Due to the objective with variable focal length mirror group of the infrared variable focal length optical system of the present invention adopt before fixing group,Zoom group, compensation group, the design of latter fixing group, its each constituent element contribution to system focal powerBe respectively positive and negative, just, positive form, wherein, negative constituent element zoom, positive constituent element compensation. Described twoInferior imaging lens group can be compressed effective clear aperture of objective with variable focal length mirror group, and ensures infrared opticsSystem meets 100% cold stop efficiency.
Along with the raising of Infrared Lens cold working property, by the light of corresponding each lens in systemOn face, increase aspheric surface, can improve the image quality of whole system, simultaneously by secondary imaging mirrorThe lens numbers of group reduces, and to improve the optical transmittance of infrared system, improves its performance.
In addition, infrared optical system of the present invention need not be focused in the time of normal temperature, when operating temperature changesWhen change, can cause the variation of focal length and the image space of optical system, cause that infrared system seriously losesAdjust, therefore, within the scope of certain variation of ambient temperature, the present invention adopts active mechanical compensation skillArt is carried out the design without thermalization. Send after thermal compensation order when controlling software, signal processing circuit is adoptedIn collection infrared image, a certain size image, calculates the figure of present position by suitable image algorithmSimilarly be no clear, the notice control circuit control thermal compensation driven by motor thermal compensation mirror using this as criterionGroup moves axially, so repeatedly until adjust picture clearly. Therefore the present invention can be-40DEG C～+ 60 DEG C of temperature ranges normally work.
The powerful infrared variable focal length optical system of the present invention is by objective with variable focal length mirror group in sumDesign and the selection of material and establishing without thermalization with the each lens surface curvature radius of secondary imaging mirrorMeter, its optical transmittance is high, and focal length variations scope is large, red for refrigeration-type 320 × 256 gazing typesOuter focus planardetector can be realized the continuous vari-focus of 10 times, and service band is 3.7 μ m～4.8 μ m,Can normally work at-40 DEG C～+ 60 DEG C ambient temperature ranges. And varifocal curve smoothing, favourableIn the realization of electromechanical means, effectively reduce the requirement of debuging precision, good imaging quality, navigation,The military domain such as search, warning, investigation and civil area will be widely used.
Claims (5)
1. an infrared variable focal length optical system, is characterized in that: comprise an objective with variable focal length mirror groupWith a secondary imaging mirror group and image planes (7), wherein, described objective with variable focal length mirror group is along optical axisBe disposed with large object lens (1), zoom mirror (2), compensating glass group (3), rear fixed mirror (4),Described secondary imaging mirror group is disposed with after secondary imaging front lens (5), secondary imaging along optical axisLens (6), described large object lens (1), zoom mirror (2), compensating glass group (3), rear fixed mirror (4)To the contribution of system focal power be respectively positive and negative, just, positive form, wherein, negative constituent element zoom,Positive constituent element compensation, described large object lens (1) are positive lens, its optical parametric radius of curvature is front surface118mm, rear surface 198mm, center thickness is 15mm, formed by single crystal silicon material, described inZoom mirror (2) is negative lens, and its optical parametric radius of curvature is front surface-650mm, rear surface-85mm, center thickness is 3mm, is made up of monocrystalline germanium material.
2. infrared variable focal length optical system according to claim 1, is characterized in that: described inCompensating glass group (3) is positive lens mirror group, and it is made up of coaxial positive convex lens and negative concavees lens,Wherein, the optical parametric radius of curvature of positive convex lens is front surface-49mm, rear surface 380mm,Center thickness is 6mm, is made up of single crystal silicon material, and the optical parametric radius of curvature of negative concavees lens isFront surface 74mm, rear surface 36mm, center thickness is 6mm, is made up of monocrystalline germanium material.
3. infrared variable focal length optical system according to claim 2, is characterized in that: described inRear fixed mirror (4) is positive lens, and its optical parametric radius of curvature is front surface 18mm, rear surface-22mm, center thickness is 6mm, formed by monocrystalline germanium material, further the curvature of field of corrective system,Aberration.
4. infrared variable focal length optical system according to claim 3, is characterized in that: described inSecondary imaging front lens (5) is positive convex lens, its optical parametric radius of curvature be front surface 58mm,Rear surface 62mm, center thickness is 3mm, is made up of monocrystalline germanium material, focal length is about 38mm.
5. infrared variable focal length optical system according to claim 4, is characterized in that: described inSecondary imaging rear lens (6) is positive convex lens, and its optical parametric radius of curvature is front surface-30.6mm, rear surface-49.62mm, center thickness is 3mm, is made up of Jiao monocrystalline germanium materialApart from being about 20mm.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010049677.6A CN106342261B (en) | 2010-09-03 | 2010-09-03 | A kind of infrared variable focal length optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010049677.6A CN106342261B (en) | 2010-09-03 | 2010-09-03 | A kind of infrared variable focal length optical system |
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| CN106342261B true CN106342261B (en) | 2014-02-05 |
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| CN201010049677.6A Expired - Fee Related CN106342261B (en) | 2010-09-03 | 2010-09-03 | A kind of infrared variable focal length optical system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107479176A (en) * | 2017-08-25 | 2017-12-15 | 南京理工大学 | A kind of five grades of zoom camera lenses of focometer |
| CN109655162A (en) * | 2018-11-30 | 2019-04-19 | 诺仪器（中国）有限公司 | Thermal infrared imager temperature measurement correction system and method |
| CN112485897A (en) * | 2020-12-25 | 2021-03-12 | 长春理工大学 | Refrigeration type medium wave infrared stepping zoom lens |
| CN115685507A (en) * | 2022-11-23 | 2023-02-03 | 福建福光股份有限公司 | Transmission-type dual-waveband infrared lens |
-
2010
- 2010-09-03 CN CN201010049677.6A patent/CN106342261B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107479176A (en) * | 2017-08-25 | 2017-12-15 | 南京理工大学 | A kind of five grades of zoom camera lenses of focometer |
| CN107479176B (en) * | 2017-08-25 | 2020-01-24 | 南京理工大学 | Five-gear zoom lens for focal length instrument |
| CN109655162A (en) * | 2018-11-30 | 2019-04-19 | 诺仪器（中国）有限公司 | Thermal infrared imager temperature measurement correction system and method |
| CN112485897A (en) * | 2020-12-25 | 2021-03-12 | 长春理工大学 | Refrigeration type medium wave infrared stepping zoom lens |
| CN115685507A (en) * | 2022-11-23 | 2023-02-03 | 福建福光股份有限公司 | Transmission-type dual-waveband infrared lens |
| CN115685507B (en) * | 2022-11-23 | 2024-03-15 | 福建福光股份有限公司 | Transmission type dual-band infrared lens |
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