CN210090810U - Economical medium-wave infrared refrigeration continuous zoom lens - Google Patents
Economical medium-wave infrared refrigeration continuous zoom lens Download PDFInfo
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- CN210090810U CN210090810U CN201920990321.9U CN201920990321U CN210090810U CN 210090810 U CN210090810 U CN 210090810U CN 201920990321 U CN201920990321 U CN 201920990321U CN 210090810 U CN210090810 U CN 210090810U
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 26
- 230000005499 meniscus Effects 0.000 claims abstract description 17
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 16
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000010703 silicon Substances 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 18
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 230000014509 gene expression Effects 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 14
- 230000004075 alteration Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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Abstract
The utility model discloses an infrared refrigeration zoom lens in succession of economical medium wave has five lens of group in proper order from the object space to the image space: the front fixed group with positive focal power comprises a meniscus silicon positive lens with a convex surface facing an object space and a meniscus germanium negative lens with a convex surface facing the object space; the zoom group with negative focal power is a biconcave germanium negative lens; the compensation group with positive focal power is a biconvex silicon positive lens; the rear fixed group with positive focal power is a meniscus germanium positive lens; the focusing group with positive focal power comprises a meniscus germanium positive lens with a convex surface facing to the image side and a meniscus silicon positive lens with a convex surface facing to the image side. The utility model can continuously zoom in the range of 28 mm-140 mm, and is suitable for a medium wave refrigeration detector with 640 multiplied by 512 and a pixel size of 15 mu m; the total length is short, the number of lenses is small, the material type is simple, the processing difficulty is low, and a good imaging effect is achieved; compare the camera lens of the same type, more economical and practical.
Description
Technical Field
The utility model belongs to the technical field of optics, a infrared refrigeration zoom lens in succession of economical medium wave for infrared refrigeration detector of medium wave is related to.
Background
The infrared zoom system has been developed rapidly in recent years and has been widely used. The system has important application in the aspects of military affairs, security protection, national civilian life and the like, and mainly comprises a detection and aiming system; a search and tracking system; civil security systems, and the like. The large visual field is used for searching the target in a large range, and the small visual field is high in resolution and used for tracking, identifying and aiming at the target. Currently, two types of zoom systems are long-wave non-refrigeration and medium-wave refrigeration. The advantages of the intermediate wave band and the advantages of the infrared refrigeration are far better than those of a long-wave uncooled continuous zooming system in imaging quality. In the medium-wave infrared refrigeration continuous zoom lens, a secondary imaging technology is used, so that a plurality of lenses are large in size, large in number of lenses, high in manufacturing cost and not beneficial to large-scale popularization and use, and the transmittance is seriously affected. Therefore, the medium-wave infrared refrigeration continuous zoom lens can realize continuous zooming in a larger range, keeps the compact structure of the lens and has reasonable cost, and becomes a new direction for design and research.
SUMMERY OF THE UTILITY MODEL
The utility model provides an infrared refrigeration zoom lens in succession of economical medium wave, the technical problem that solve provide an optics total length, small, the dress is transferred conveniently, and the zoom is big, and the imaging quality is high, the camera lens with reasonable cost. The working wavelength band of the optical system is 3.7-4.8 micrometers, the focal length is 28-140 mm, the F number is 4, the adaptive resolution is 640 multiplied by 512, the pixel size is 15 micrometers, the total length of the optical system is 104.9mm, and the maximum aperture is 36 mm.
In order to realize the purpose, the utility model discloses a technical scheme be:
an economical medium-wave infrared refrigeration continuous zoom lens sequentially comprises a front fixed group, a zoom group, a compensation group, a rear fixed group, a focusing group and a detector part from an object space in front to an image space behind;
the front fixed group has positive focal power, comprises a first lens on the front, and is a meniscus silicon single crystal positive lens with a convex surface facing an object space, and the surface types are spherical; the second lens is a meniscus germanium single crystal negative lens with a convex surface facing the object space, and one side facing the image space is an aspheric surface;
the zoom group has negative focal power, is a biconcave germanium single crystal negative lens and is used as a third lens, one side of the third lens facing the object space is an aspheric surface, and the total movement stroke of the lenses is 11.96 mm;
the compensation group has positive focal power, is a biconvex silicon positive lens and is used as a fourth lens, the surface types of the positive lens are spherical, and the total movement stroke of the lenses is 10.021 mm;
the rear fixed group has positive focal power, is a meniscus germanium single crystal positive lens with a convex surface facing an object space, and is used as a fifth lens, and the concave surface of the fifth lens is a diffraction surface;
the focusing group has positive focal power, comprises a front sixth lens, and is a meniscus germanium single crystal positive lens with a convex surface facing to an image space, wherein the convex surface is a diffraction surface; the seventh lens at the back is a meniscus silicon single crystal positive lens with a convex surface facing the image space, the surface types are all spherical, and the total moving stroke of the lens is 0.35 mm;
a medium wave refrigeration detector part is arranged behind the focusing group and comprises a protection window, a cold screen, a cold diaphragm and an image surface; the protection window is positioned behind the focusing group, the cold screen is positioned behind the protection window, the cold diaphragm is positioned behind the cold screen, and the constant focusing is kept in the zooming process.
The object space is the front, and the image space is the back.
The lens satisfies the following parameters:
the effective focal length EFL of the lens is 28-140 mm, the F number is 4, the total length of the optical system is 104.9mm, the adaptive detector resolution is 640 multiplied by 512, the pixel size is 15 mu m, and the adaptive waveband is 3.7-4.8 mu m. Under the condition of realizing 5 times of zoom ratio, the total length of the lens is kept at 104.9mm, and the compactness of the structure is ensured.
The horizontal field angle range of the lens is as follows: 2w is 19.5 to 3.9 degrees.
The aspheric surfaces in the lenses of the lens satisfy the following expressions:
where z is the rise of the distance from the aspheric surface vertex when the aspheric surface is at the position of height r in the optical axis direction, c represents the vertex curvature of the surface, k is the conic coefficient α2、α3、α4、α5、α6Are high-order aspheric coefficients.
The diffractive surface in the lens of the lens satisfies the following expression:
Φ＝A2ρ2+A2ρ4
where Φ is the phase of the diffraction plane, and ρ is r/rn,rnIs the planned radius of the diffraction plane, A1、A2Is the phase coefficient of the diffraction plane.
The surface of the first lens close to the object side is plated with a diamond-like carbon film.
The average MTF of the full field of view of the lens is >0.496@20 lp/mm.
The focusing group adopts a two-piece lens group, is rare in medium-wave infrared refrigeration continuous zooming and has high design difficulty. The distortion of the whole visual field is less than 3%, and the human eyes have no obvious distortion feeling.
The direction from the object space to the image space is from front to back.
The utility model has the advantages that: the optical system has a 5-time zoom ratio, the total length of the optical system is 104.9mm, and the maximum aperture is 36 mm. The structure is compact, the zooming curve is smooth, and the maximum movement amount of the lens is 11.96 mm. The zoom group and the compensation group are both provided with only one lens, so that the stability of an optical axis in the zooming process can be better ensured. Meanwhile, the refraction type optical structure is used, so that the installation and adjustment are simple and convenient, and the mass production is easy. The imaging quality was excellent throughout the zoom range with an average MTF of >0.496@20lp/mm for the full field of view.
Drawings
Fig. 1 is a diagram of an optical system when the focal length of the economical medium-wave infrared refrigeration zoom lens is 140 mm;
FIG. 2 is a point diagram of the economical medium wave infrared refrigerating zoom lens with a focal length of 140 mm;
FIG. 3 is an optical transfer function diagram (with a cut-off resolution of 20lp/mm) of the economical intermediate wave infrared refrigerating zoom lens with a focal length of 140 mm;
fig. 4 is a field curvature distortion diagram of the economical medium wave infrared refrigeration zoom lens with a focal length of 140 mm;
fig. 5 is a diagram of an optical system when the focal length of the economical medium-wave infrared refrigeration zoom lens is 28 mm;
fig. 6 is a point chart of the economical medium wave infrared refrigeration zoom lens provided by the present invention when the focal length is 28 mm;
fig. 7 is an optical transfer function diagram (with a cut-off resolution of 20lp/mm) when the focal length of the economical medium-wave infrared refrigeration zoom lens is 28 mm;
fig. 8 is a field curvature distortion diagram when the focal length of the economical medium wave infrared refrigeration zoom lens is 28 mm;
the lens comprises a lens body, a lens cover, a lens module and a lens module, wherein 100-object space, L1, L2-front fixed group, L3-zoom group, L4-compensation group, L5-rear fixed group, L6, L7-focusing group, 101-detector protection window, 102-cold screen, S15-cold diaphragm, 103-image surface and S1-S14 are all surfaces of the lens.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings by way of examples.
This embodiment is an example of the application of the present invention to a medium wave refrigeration resolution 640 x 512 pixel size 15 μm staring type focal plane detector.
Fig. 1 and fig. 5 are diagrams of the optical system of the present invention at focal lengths of 140mm and 28mm, respectively, and the structures of the lenses are the same, and one of the diagrams is taken as an example for explanation.
As shown in fig. 1, the present embodiment includes front fixed groups L1 and L2 of positive power, a variable power group L3 of negative power, a compensation group L4 of positive power, a rear fixed group L5 of positive power, focusing groups L6 and L7 of positive power, and final detectors 101, 102, S15, 103.
In the front fixed group, the first lens, L1, is a positive lens with a convex surface facing the object space, the material is silicon single crystal, both surfaces of the positive lens are spherical, the second lens, L2, is a negative lens with a convex surface facing the object space, the material is germanium single crystal, and both surfaces of the S4 are aspheric. The variable power group L3, namely the third lens, is a double-concave negative lens, is made of germanium single crystal, has an aspheric surface on the surface of S5, is a movable lens, plays a role in changing power in the zooming process, has a movement curve of 8 parabolas, and has a total movement stroke of 11.96 mm. The compensation group L4, namely the fourth lens, is a biconvex positive lens made of silicon single crystal, the two surfaces of the positive lens are spherical surfaces, the lens is a movable lens, when the zoom group lens moves, the compensation group lens correspondingly moves to ensure that the position of an image plane is unchanged, the moving curve is 8 parabolas, and the total moving stroke is 10.021 mm. The rear fixed group L5, i.e., the fifth lens, is a meniscus positive lens with the convex surface facing the object, and is made of germanium single crystal, wherein the S10 plane is a diffraction plane. In the focusing group, two lenses are provided, namely an L6 (sixth lens) which is a meniscus positive lens with the convex surface facing the image space, the material is germanium single crystal, the surface of S12 is a diffractive aspheric surface, and an L7 (seventh lens) which is a concave-convex positive lens with the convex surface facing the image space, the material is silicon single crystal, the lens is a movable lens, when the target distance is changed and the working temperature is changed, the lens can be used for refocusing, and the total moving stroke is 0.35 mm; the medium wave refrigeration detector includes: the protective window 101, the cold screen 102, the diaphragm S15 and the imaging surface are 12.3mm, the resolution is 640 multiplied by 512, and the pixel size is 15 mu m.
Among the seven lenses, the surface of the first lens S1 is plated with the diamond-like carbon film, because the surface is exposed, the diamond-like carbon film needs to be plated for protection, and the surfaces of the rest S2-S14 are plated with antireflection films.
Table 1 is the utility model discloses at focus 140mm, optical structure parameter when 28 mm:
TABLE 1
The aspherical surfaces mentioned in the above seven lenses are all even-order aspherical surfaces, and the expression thereof is as follows
Where z is the rise of the distance from the aspheric surface vertex when the aspheric surface is at the position of height r in the optical axis direction, c represents the vertex curvature of the surface, k is the conic coefficient α2、α3、α4、α5、α6Are high-order aspheric coefficients.
Table 2 shows aspheric coefficients of the surfaces S4, S5, S10, S12:
TABLE 2
| Surface of | 4th | 6th | 8th | 10th | 12th |
| S4 | 7.252E-07 | 2.417E-09 | -1.692E-11 | 9.182E-14 | -1.772E-16 |
| S5 | 2.224E-05 | -2.088E-07 | 8.161E-09 | -1.559E-10 | 1.117E-12 |
| S10 | 5.992E-06 | 7.669E-08 | -1.893E-09 | 2.433E-11 | -1.186E-13 |
| S12 | 3.679E-04 | 1.866E-05 | -6.709E-07 | 7.386E-08 | -1.467E-09 |
The expression of the diffraction surface mentioned in the above seven-piece lens is as follows:
Φ＝A1ρ2+A2ρ4
where Φ is the phase of the diffraction plane, and ρ is r/rn,rnIs the planned radius of the diffraction plane, A1、A2Is the phase coefficient of the diffraction plane.
Table 3 is the diffraction coefficients of the surfaces S10, S12;
TABLE 3
| Surface of | ||
| S10 | -23 | -1.406 |
| S13 | -23 | -5 |
The effects of the present invention will be described in further detail below with reference to an aberration analysis chart.
Fig. 2-4 are aberration analysis diagrams of the specific embodiment of the economical mid-wave infrared refrigerating zoom lens shown in fig. 1 in a telephoto state, fig. 2 is a point diagram, fig. 3 is an MTF diagram, and fig. 4 is a field curvature distortion diagram.
Fig. 6-8 are aberration analysis graphs of the specific embodiment of the economical mid-wave infrared refrigerating zoom lens in fig. 5 in a short focus state, fig. 6 is a point diagram, fig. 7 is an MTF graph, and fig. 8 is a field curvature distortion graph.
It can be found from the figure that various aberrations of each focal segment are well corrected, the diffuse spots are all corrected to be close to the size of the Airy spots, the MTF is good, and the distortion is less than 3%.
The effective focal length EFL of the lens is 28-140 mm, the F number is 4, the total length of the optical system is 104.9mm, the adaptive detector resolution is 640 multiplied by 512, and the pixel size is 15 mu m. The horizontal field angle range of the lens is as follows: 2w is 19.5 to 3.9 degrees.
Therefore, the utility model discloses economical medium wave infrared refrigeration zoom lens has good image quality in succession.
Finally, it should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Therefore, although the present invention has been described in detail with reference to the above embodiments, it will be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and within the scope of the following claims.
Claims (7)
1. The utility model provides an infrared refrigeration zoom lens in succession of economical medium wave which characterized in that: the device comprises a front fixed group, a zoom group, a compensation group, a rear fixed group, a focusing group and a detector part from an object space in front to an image space in back in sequence;
the front fixed group has positive focal power, comprises a first lens on the front, and is a meniscus silicon single crystal positive lens with a convex surface facing an object space, and the surface types are spherical; the second lens is a meniscus germanium single crystal negative lens with a convex surface facing the object space, and one side facing the image space is an aspheric surface;
the zoom group has negative focal power, is a biconcave germanium single crystal negative lens and is used as a third lens, one side of the third lens facing the object space is an aspheric surface, and the total movement stroke of the lenses is 11.96 mm;
the compensation group has positive focal power, is a biconvex silicon positive lens and is used as a fourth lens, the surface types of the positive lens are spherical, and the total movement stroke of the lenses is 10.021 mm;
the rear fixed group has positive focal power, is a meniscus germanium single crystal positive lens with a convex surface facing an object space, and is used as a fifth lens, and the concave surface of the fifth lens is a diffraction surface;
the focusing group has positive focal power, comprises a front sixth lens, and is a meniscus germanium single crystal positive lens with a convex surface facing to an image space, wherein the convex surface is a diffraction surface; the seventh lens at the back is a meniscus silicon single crystal positive lens with a convex surface facing the image space, the surface types are all spherical, and the total moving stroke of the lens is 0.35 mm;
a medium wave refrigeration detector part is arranged behind the focusing group and comprises a protection window, a cold screen, a cold diaphragm and an image surface; the protection window is positioned behind the focusing group, the cold screen is positioned behind the protection window, the cold diaphragm is positioned behind the cold screen, and the constant focusing is kept in the zooming process.
2. The economical medium wave infrared refrigerating zoom lens as claimed in claim 1, wherein the lens satisfies the following parameters:
the effective focal length EFL of the lens is 28-140 mm, the F number is 4, the total length of the optical system is 104.9mm, the adaptive detector resolution is 640 multiplied by 512, the pixel size is 15 mu m, and the adaptive waveband is 3.7-4.8 mu m.
3. The economical medium wave infrared refrigerating zoom lens as claimed in claim 1, wherein the horizontal field angle range of the lens is: 2w is 19.5 to 3.9 degrees.
4. The economical medium wave infrared refrigerating zoom lens as claimed in claim 1, wherein the aspheric surface of the lens satisfies the following expression:
where z is the rise of the distance from the aspheric surface vertex when the aspheric surface is at the position of height r in the optical axis direction, c represents the vertex curvature of the surface, k is the conic coefficient α2、α3、α4、α5、α6Are high-order aspheric coefficients.
5. The economical medium wave infrared refrigerating zoom lens as claimed in claim 1, wherein the diffraction surface in the lens satisfies the following expression:
Φ＝A1ρ2+A2ρ4
where Φ is the phase of the diffraction plane, and ρ is r/rn,rnIs the planned radius of the diffraction plane, A1、A2Is the phase coefficient of the diffraction plane.
6. The economical medium-wave infrared refrigerating zoom lens system as claimed in claim 1, wherein the surface of the first lens near the object side is coated with a diamond-like carbon film.
7. The economical medium wave infrared refrigerating zoom lens system of claim 1, wherein the average MTF of the full field of view of the lens is >0.496@20 lp/mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296231A (en) * | 2021-04-12 | 2021-08-24 | 三河市蓝思泰克光电科技有限公司 | Medium wave infrared refrigeration continuous zoom lens |
| CN114137699A (en) * | 2021-12-06 | 2022-03-04 | 湖北久之洋红外系统股份有限公司 | Small high-resolution athermalized medium-wave infrared optical system |
| CN114355594A (en) * | 2021-12-31 | 2022-04-15 | 福建福光股份有限公司 | Miniaturized medium-wave infrared zooming optical system |
| CN114924392A (en) * | 2022-04-29 | 2022-08-19 | 福建福光股份有限公司 | Medium wave refrigeration double-view-field infrared lens |
-
2019
- 2019-06-27 CN CN201920990321.9U patent/CN210090810U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113296231A (en) * | 2021-04-12 | 2021-08-24 | 三河市蓝思泰克光电科技有限公司 | Medium wave infrared refrigeration continuous zoom lens |
| CN114137699A (en) * | 2021-12-06 | 2022-03-04 | 湖北久之洋红外系统股份有限公司 | Small high-resolution athermalized medium-wave infrared optical system |
| CN114137699B (en) * | 2021-12-06 | 2024-02-02 | 湖北久之洋红外系统股份有限公司 | Small high-resolution athermalized medium-wave infrared optical system |
| CN114355594A (en) * | 2021-12-31 | 2022-04-15 | 福建福光股份有限公司 | Miniaturized medium-wave infrared zooming optical system |
| CN114924392A (en) * | 2022-04-29 | 2022-08-19 | 福建福光股份有限公司 | Medium wave refrigeration double-view-field infrared lens |
| CN114924392B (en) * | 2022-04-29 | 2023-08-11 | 福建福光股份有限公司 | Medium wave refrigeration double-view-field infrared lens |
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Effective date of registration: 20210301 Address after: 065200 l03-g workshop in Baishi Jingu Yanjiao international industrial base, west of Yingbin North Road and north of Gushan West Road, Yanjiao Development Zone, Sanhe City, Langfang City, Hebei Province Patentee after: SANHE LENSTEC PHOTOELECTRIC TECHNOLOGY Co.,Ltd. Address before: 100016 courtyard 160, East Bajianfang village, Jiangtai Township, Chaoyang District, Beijing Patentee before: BEIJING LENSTECH SCIENCE & TECHNOLOGY Co.,Ltd. |
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Address after: 065200 l03-g workshop in Baishi Jingu Yanjiao international industrial base, west of Yingbin North Road and north of Gushan West Road, Yanjiao Development Zone, Sanhe City, Langfang City, Hebei Province Patentee after: Hebei Lansitek Optoelectronic Technology Co.,Ltd. Address before: 065200 l03-g workshop in Baishi Jingu Yanjiao international industrial base, west of Yingbin North Road and north of Gushan West Road, Yanjiao Development Zone, Sanhe City, Langfang City, Hebei Province Patentee before: SANHE LENSTEC PHOTOELECTRIC TECHNOLOGY CO.,LTD. |