CN205942065U - Infrared zoom of high permeability medium wave - Google Patents
Infrared zoom of high permeability medium wave Download PDFInfo
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- CN205942065U CN205942065U CN201620925357.5U CN201620925357U CN205942065U CN 205942065 U CN205942065 U CN 205942065U CN 201620925357 U CN201620925357 U CN 201620925357U CN 205942065 U CN205942065 U CN 205942065U
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Abstract
The utility model discloses an infrared zoom of high permeability medium wave, incline extremely including the accessory things for instance incline along preceding fixed group, a change times group, compensation group, first after -fixing group, second after -fixing group and detector that the optical axis distributes in proper order characterized in that: it adopts positive meniscus lens, biconcave negative lens, biconvex positive lens, positive meniscus lens and two positive meniscus lens respectively, becoming doubly, group, compensation group all carry out preceding, back motion through ordering about of actuating mechanism to realize changing the out of focus of focus and retrieved image face respectively. The utility model discloses an infrared zoom of high permeability medium wave through becoming zooming and compensation movement of a times group, compensation group, has both realized great change times (20 times) and has compared, because lens figure (6) is less, has guaranteed again that whole camera lens system has higher transmissivity, has improved medium wave infrared imaging's image quality, and compact structure has temperature compensation function, easily debugs and assembles.
Description
Technical field
This utility model is related to a kind of high permeability medium-wave infrared zoom lens, and in particular, more particularly, to one kind should
For the high permeability medium-wave infrared zoom lens in infrared optical imaging system that freeze.
Background technology
Although medium-wave infrared refrigeration type infrared detector is expensive, its long wave non-refrigerated infrared detector relatively has
Preferably NETD (NEDT is noise equivalent temperature difference, is the important indicator differentiating detector and thermal imaging system performance).The non-system of long wave
Cold Infrared Detectorss NETD typically from 50mk-120mk, in red refrigeration type infrared detector NETD typically from 10mk-25mk
?.Therefore, medium-wave infrared thermal imaging system, in military affairs, the key areas such as coast defence, has irreplaceable effect.
In medium wave refrigeration mode thermal infrared imager, camera lens is extremely important, but in current medium-wave infrared zoom lens, all makes
With 8, the lens of 9 even more multi-discs, due to being limited by coating process domestic at present, often increase a piece of lens, entirely
The transmitance of camera lens reduces, and leads to the hydraulic performance decline of whole thermal infrared imager.Disclosed in Chinese patent literature CN1482647B
A kind of big zoom ratio medium wave infrared continuous zoom lens adopt 8 lens, and also Chinese patent literature CN105445934A is open
A kind of compact suitching type three visual field medium-wave infrared optical system employ 12 lens, by above description, lens
Few, the medium-wave infrared zoom lens design of high permeability is a difficult problem.
Content of the invention
This utility model is for the shortcoming overcoming above-mentioned technical problem, there is provided a kind of height reducing lens usage quantity
Transmitance medium-wave infrared zoom lens.
High permeability medium-wave infrared zoom lens of the present utility model, including be sequentially distributed from thing side to image side along optical axis
First fixing group, zoom group, compensation group, fix group after first, fix group and detector after second, detector is arranged at detector
On focal plane；It is characterized in that：Described first fixing group is positive meniscus lens convex surface facing thing side, and zoom group is born thoroughly for concave-concave
Mirror, compensation group is biconvex positive lens, fixes the positive meniscus lens that group is convex surface facing thing side after first, fixes group by after second
One lens and the second lens composition, the first lens, the second lens are the positive meniscus lens convex surface facing thing side；Zoom group, benefit
Repay group and all forward and backward motion is carried out by ordering about of drive mechanism, to realize the out of focus changing focal length and compensating image planes respectively；In mirror
Head, by Radix Rumiciss to focal length change procedure, is fixed between group after the distance between zoom group and front fixing group, compensation group and first
Distance be all gradually increased.
High permeability medium-wave infrared zoom lens of the present utility model, described first fixing group, zoom group, compensation group, first
Fixing group, the first lens, the second lens are respectively provided with positive and negative, diopter just, just, just, positive afterwards.
High permeability medium-wave infrared zoom lens of the present utility model, set between the second lens to detector focal plane successively
It is equipped with detector window and cold stop.
High permeability medium-wave infrared zoom lens of the present utility model, if the focal length of front fixing group is f1, Jiao of zoom group
Away from for f2, the focal length of fixing group is f after second4, it meets following inequality group：
Wherein, ftIt is in the focal length having during focal length state by camera lens.
High permeability medium-wave infrared zoom lens of the present utility model, fix before note group, zoom group, compensation group, after first
Fixing group, the first lens, the lens sequence number of the second lens are respectively 1,2,3,4,5,6, mark respectively from its curved surface of thing side to image side
It is designated as S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, the distance respectively 12mm of adjacent two curved surfaces of S1 to S12,
D1mm, 4mm, D2mm, 5mm, D3mm, 4mm, 80.10mm, 7mm, 15.40mm, 5mm, the distance of S12 to detector focal plane is
24.5mm, camera lens by Radix Rumiciss to focal length change during, D1 changes between 31.40 to 106.20, D2 from 117.4 to
Change between 14.55, D3 changes between 17.20 to 45.25.
High permeability medium-wave infrared zoom lens of the present utility model, after described first, fixing group and the second lens are silicon material
Material, first fixing group, zoom group, compensation group and the first lens are germanium material；Curved surface S3 and curved surface S6 is even aspheric surface, even
Secondary aspheric surface is determined by equation below：
Wherein, wherein, k is aspheric circular cone coefficient, α4、α6、α8For aspheric 4 times, 6 times, 8 ordered coefficients；R is non-
Height in optical axis vertical direction on sphere, z is the distance in aspheric surface in the horizontal direction of lens centre；
For even aspheric surface S3, k, α4、α6、α8Take -0.85,1.53 × 10 respectively-7、-2.4×10-10、2.87×10-13；For even aspheric surface S6, k, α4、α6、α8Take 1.2,1.26 × 10 respectively-7、-1.8×10-10、3.03×10-13.
High permeability medium-wave infrared zoom lens of the present utility model, described curved surface S1, S2, S3, S4, S5, S6, S7, S8,
The radius of curvature of S9, S10, S11, S12 divide than for 201.653mm, 350.275mm, -306.83mm, 208.55mm,
602.16mm、-249.83mm、89.25mm、100.19mm、66.32mm、114.50mm、54.42mm、69.06mm.
The beneficial effects of the utility model are：High permeability medium-wave infrared zoom lens of the present utility model, by thing
Side to image side fixing group before setting gradually along optical axis, zoom group, compensation group, fix group and by the first lens and second after first
Fix group after the second of lens composition, and its to be respectively adopted positive meniscus lens, double-concave negative lens, biconvex positive lens, negative bent moon saturating
Mirror, positive meniscus lens, positive meniscus lens, by zoom group, the zoom of compensation group and compensation campaign, had both achieved larger zoom
(20 times) ratios, because number of lenses (6) is less, in turn ensure that whole lens system has higher light transmittance, in improve
The picture quality of ripple infrared imaging.This utility model by choosing and can arrange 6 lens, can be achieved with 20 times of zoom
Than, there is very high transmitance simultaneously, compact conformation, there is temperature compensation function it is easy to debuging and assembling.
Brief description
Fig. 1 is the structural representation at high permeability medium-wave infrared zoom lens focal length end of the present utility model；
Fig. 2 is the structural representation at burnt end in high permeability medium-wave infrared zoom lens of the present utility model；
Fig. 3 is the structural representation of high permeability medium-wave infrared zoom lens wide-angle side of the present utility model；
Fig. 4 is the modulation transfer function figure that camera lens of the present utility model is in focal length end；
Fig. 5 is the modulation transfer function figure that camera lens of the present utility model is in middle Jiao end；
Fig. 6 is the modulation transfer function figure that camera lens of the present utility model is in wide-angle side.
In figure：Group is fixed before 1,2 zoom groups, 3 compensation groups, fix group after 4 first, 5 first lens, 6 second lens, 7 spies
Survey device window, 8 cold stops, 9 detector focal planes.
Specific embodiment
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2 and Figure 3, sets forth high permeability medium-wave infrared zoom lens focal length of the present utility model
The structural representation at end, middle Jiao's section and wide-angle side, it is by the front fixing group 1 being sequentially distributed along optical axis from thing side to image side, zoom
Fix group and detector composition after fixing group 4, second after group 2, compensation group 3, first, fix group after second by the first lens 5 He
Second lens 6 form, and front fixing group 1 is made up of the positive meniscus lens convex surface facing thing side, to realize the target to different distance
It is focused；Zoom group 2 adopts double-concave negative lens, and for changing the focal length of system, compensation group 3 adopts biconvex positive lens, is used for
Far and near different object focus are understood, far and near different object focus is understood it is possible in uniform temperature excursion
Compensate the out of focus of image planes；After first, fixing group 4 using the positive meniscus lens convex surface facing thing side, put down by the aberration for realizing system
Weighing apparatus；The first lens 5 in group and the second lens 6 are fixed all using the positive meniscus lens convex surface facing thing side after second.Second is saturating
Mirror 6 is disposed with detector window 7 and cold stop 8 to detector focal plane 9.
Zoom group 2 and compensation group 3 carry out forward and backward motion by ordering about of drive mechanism, with realize respectively change focal length and
Compensate the out of focus of image planes, be such as driven using cam mechanism.In camera lens by Radix Rumiciss to focal length change procedure, zoom group 2 with
After the distance between front fixing group 1, compensation group 3 and first, the distance between fixing group 4 is all gradually increased, zoom group 2 and compensation
The distance between group 3 tapers into.By the motion of zoom group 2 and compensation group 3, can achieve (20 times) ratios of larger zoom, due to
Employ fewer number of lens (6) it is ensured that the high permeability of whole lens.
Group 4 is fixed, the first lens 5, the diopter of the second lens 6 divide after front fixing group 1, zoom group 2, compensation group 3, first
Wei not be positive and negative, just, just, just, just, it is non-that zoom group 2 is all processed as even towards the face of thing side and compensation group 3 towards the face of image side
Sphere, after first, fixing group 4 and the second lens 6 are silicon materials and make, and remaining four lens is made by germanium material, germanium material
Even aspheric surface easy to process.
High permeability medium-wave infrared zoom lens of the present utility model, service band is 3-5 μm, and zoom ratio is 20 times,
Long-focus is 280mm, and shortest focal length is 14mm.Group 1, zoom group 2 is fixed, to fix group 4, first after compensation group 3, first saturating before note
Mirror 5, the second lens 6 lens sequence number be respectively 1,2,3,4,5,6, from its curved surface of thing side to image side be respectively labeled as S1, S2,
S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, the optical component parameter of each lens is as shown in table 1：
Table 1
Even aspheric surface S3 and S6 are determined by equation below：
Wherein, wherein, k is aspheric circular cone coefficient, α4、α6、α8For aspheric 4 times, 6 times, 8 ordered coefficients；R is non-
Height in optical axis vertical direction on sphere, z is the distance in aspheric surface in the horizontal direction of lens centre.Even is non-
The aspherical surface data of Spherical Surface S 3 and S6 is as shown in table 2：
Table 1
| k | α4 | α6 | α8 | |
| Aspheric surface S3 | -0.85 | 1.53e-007 | -2.4e-010 | 2.87e-013 |
| Aspheric surface S6 | 1.2 | 1.26e-007 | -1.8e-010 | 3.03e-013 |
Wherein, in aspheric surface graphic data, e-n represents " × 10-n", for example 2.01e-06 represents 2.01 × 10-6.
In camera lens by Radix Rumiciss to focal length change procedure, the value such as table 3 of D1, D2, D3 under Radix Rumiciss, middle burnt, focal length state
Shown：
Table 3
As shown in Figure 4, Figure 5 and Figure 6, sets forth camera lens of the present utility model and be in focal length, middle Jiao and wide-angle side
Modulation transfer function figure, and its transverse axis is every millimeter of demand pairs (line pair per millimeter), the longitudinal axis is right
Ratio number of degrees value.It can be seen that this optical system MTF closely diffraction limit value in 20lp/mm, picture quality is higher.
This utility model can be achieved by the prior art without the technical characteristic of description, will not be described here.Certainly, on
Stating bright is not to restriction of the present utility model, and this utility model is also not limited to the example above, the art general
Change, remodeling, interpolation or replacement that logical technical staff is made in essential scope of the present utility model, for example, change aspheric surface
For binary diffraction face, protection domain of the present utility model also should be belonged to.
Claims (7)
1. a kind of high permeability medium-wave infrared zoom lens, including front fixing group be sequentially distributed from thing side to image side along optical axis
(1), zoom group (2), compensation group (3), fix group (4) after first, fix group and detector after second, detector is arranged at spy
Survey on device focal plane (9)；It is characterized in that：Described first fixing group is positive meniscus lens convex surface facing thing side, and zoom group is double
Recessed minus lenses, compensation group is biconvex positive lens, fixes the positive meniscus lens that group is convex surface facing thing side after first, fixing after second
Group is made up of the first lens (5) and the second lens (6), and the positive bent moon that the first lens, the second lens are convex surface facing thing side is saturating
Mirror；Zoom group, compensation group all carry out forward and backward motion by ordering about of drive mechanism, to realize respectively changing focal length and retrieved image
The out of focus in face；In camera lens by Radix Rumiciss to focal length change procedure, the distance between zoom group and front fixing group, compensation group and first
The distance between fixing group is all gradually increased afterwards.
2. high permeability medium-wave infrared zoom lens according to claim 1 it is characterised in that：Described front fixing group (1),
Zoom group (2), compensation group (3), fix group (4) after first, the first lens (5), the second lens (6) be respectively provided with positive and negative, just,
Just, just, positive diopter.
3. high permeability medium-wave infrared zoom lens according to claim 1 and 2 it is characterised in that：Second lens (6) are extremely
It is disposed with detector window (7) and cold stop (8) between detector focal plane (9).
4. high permeability medium-wave infrared zoom lens according to claim 1 and 2 it is characterised in that：If front fixing group (1)
Focal length be f1, zoom group (2) focal length be f2, the focal length of fixing group is f after second4, it meets following inequality group：
Wherein, ftIt is in the focal length having during focal length state by camera lens.
5. high permeability medium-wave infrared zoom lens according to claim 1 and 2 it is characterised in that：Group is fixed before note
(1), zoom group (2), compensation group (3), fix after first group (4), the first lens (5), the second lens (6) lens sequence number respectively
For 1,2,3,4,5,6, from its curved surface of thing side to image side be respectively labeled as S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11,
The distance of adjacent two curved surfaces of S12, S1 to S12 be respectively 12mm, D1mm, 4mm, D2mm, 5mm, D3mm, 4mm, 80.10mm, 7mm,
15.40mm, 5mm, the distance of S12 to detector focal plane (9) is 24.5mm, during camera lens is by Radix Rumiciss to focal length change,
D1 changes between 31.40 to 106.20, and D2 changes between 117.4 to 14.55, and D3 changes between 17.20 to 45.25.
6. high permeability medium-wave infrared zoom lens according to claim 5 it is characterised in that：Group is fixed after described first
(4) and the second lens (6) are silicon materials, and front fixing group (1), zoom group (2), compensation group (3) and the first lens (5) are germanium material
Material；Curved surface S3 and curved surface S6 is even aspheric surface, and even aspheric surface is determined by equation below：
Wherein, k is aspheric circular cone coefficient, α4、α6、α8For aspheric 4 times, 6 times, 8 ordered coefficients；R is distance in aspheric surface
Height in optical axis vertical direction, z is the distance in aspheric surface in the horizontal direction of lens centre；
For even aspheric surface S3, k, α4、α6、α8Take -0.85,1.53 × 10 respectively-7、-2.4×10-10、2.87×10-13；Right
In even aspheric surface S6, k, α4、α6、α8Take 1.2,1.26 × 10 respectively-7、-1.8×10-10、3.03×10-13.
7. high permeability medium-wave infrared zoom lens according to claim 5 it is characterised in that：Described curved surface S1, S2,
The radius of curvature of S3, S4, S5, S6, S7, S8, S9, S10, S11, S12 divide than for 201.653mm, 350.275mm ,-
306.83mm、208.55mm、602.16mm、-249.83mm、89.25mm、100.19mm、66.32mm、114.50mm、
54.42mm、69.06mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620925357.5U CN205942065U (en) | 2016-08-23 | 2016-08-23 | Infrared zoom of high permeability medium wave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620925357.5U CN205942065U (en) | 2016-08-23 | 2016-08-23 | Infrared zoom of high permeability medium wave |
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| CN205942065U true CN205942065U (en) | 2017-02-08 |
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| CN201620925357.5U Withdrawn - After Issue CN205942065U (en) | 2016-08-23 | 2016-08-23 | Infrared zoom of high permeability medium wave |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054364A (en) * | 2016-08-23 | 2016-10-26 | 山东神戎电子股份有限公司 | High-transmittance medium-wave infrared zoom lens |
| CN107991763A (en) * | 2018-01-16 | 2018-05-04 | 山东神戎电子股份有限公司 | A kind of high definition long-focus LONG WAVE INFRARED camera lens |
| CN114460729A (en) * | 2022-01-25 | 2022-05-10 | 凯迈（洛阳）测控有限公司 | Large-relative-aperture large-target-surface uncooled infrared continuous zooming optical system |
-
2016
- 2016-08-23 CN CN201620925357.5U patent/CN205942065U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106054364A (en) * | 2016-08-23 | 2016-10-26 | 山东神戎电子股份有限公司 | High-transmittance medium-wave infrared zoom lens |
| CN106054364B (en) * | 2016-08-23 | 2018-08-07 | 山东神戎电子股份有限公司 | A kind of high transmittance medium-wave infrared zoom lens |
| CN107991763A (en) * | 2018-01-16 | 2018-05-04 | 山东神戎电子股份有限公司 | A kind of high definition long-focus LONG WAVE INFRARED camera lens |
| CN114460729A (en) * | 2022-01-25 | 2022-05-10 | 凯迈（洛阳）测控有限公司 | Large-relative-aperture large-target-surface uncooled infrared continuous zooming optical system |
| CN114460729B (en) * | 2022-01-25 | 2023-07-21 | 凯迈（洛阳）测控有限公司 | Large-relative-aperture large-target-surface uncooled infrared continuous zooming optical system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170208 Effective date of abandoning: 20180807 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170208 Effective date of abandoning: 20180807 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |