CN210090813U - Economical thermal imaging continuous zoom lens - Google Patents
Economical thermal imaging continuous zoom lens Download PDFInfo
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- CN210090813U CN210090813U CN201920983058.0U CN201920983058U CN210090813U CN 210090813 U CN210090813 U CN 210090813U CN 201920983058 U CN201920983058 U CN 201920983058U CN 210090813 U CN210090813 U CN 210090813U
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- 238000001931 thermography Methods 0.000 title claims abstract description 24
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 20
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 230000005499 meniscus Effects 0.000 claims abstract description 11
- 239000013078 crystal Substances 0.000 claims description 15
- 230000014509 gene expression Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 230000004075 alteration Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Abstract
The utility model discloses an economic thermal imaging zoom lens in succession has five groups of lenses from the object space to the image space in proper order, include: the front fixed group with positive focal power is a meniscus germanium positive lens with a convex surface facing to an 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 germanium positive lens; the rear fixed group with negative focal power is a meniscus germanium negative lens with a convex surface facing to the image space; the focusing group with positive focal power is a meniscus germanium positive lens with a convex surface facing the image space. The utility model discloses a can zoom in 35mm ~ 105mm within range continuously, F number is 1.4, is applicable to 640 x 512, 17 mu m long wave infrared uncooled detector of pixel size; the zoom and compensation group in the full focus section has short moving stroke, smooth curve, high optical axis stability and good imaging effect; compared with the same type of lens, the lens is small in size, light in weight, more economical and practical.
Description
Technical Field
The utility model belongs to the technical field of optics, a an economical thermal imaging continuous zoom lens for infrared uncooled detector of long wave is related to.
Background
In recent years, infrared imaging systems widely used in the fields of search, navigation, detection, tracking, and the like have increasingly started to adopt continuous zoom systems. The target can be identified and tracked in a small view field; the large field of view can be used for searching a large range of objects. The infrared continuous zoom system is required to satisfy the requirements of wide-band and multi-field of view, and aberration needs to be corrected, which often causes complexity of the system or poor imaging quality. Meanwhile, the design also puts high requirements on the adjustment and processing. In order to overcome the target blurring in the zooming switching process and improve the accuracy of tracking search, an infrared long-wave continuous zoom lens which is simple in structure, good in imaging quality and provided with a certain zoom ratio is required. The requirements on functionality are met through good zoom track design and reasonable aberration correction, and the cost is lower.
SUMMERY OF THE UTILITY MODEL
The utility model provides an economical thermal imaging zoom lens in succession, the technical problem that solve provide an optical structure stable, have certain zoom ratio, the dress is transferred conveniently, the economical thermal imaging zoom lens in succession that imaging quality is high. The working wave band is 8-12 microns, the focal length is 35 mm-105 mm, the F number is 1.4, the adaptive resolution is 640 multiplied by 512, the pixel size is 17 microns, the total length of the optical system is 160mm, and the maximum caliber is 85 mm.
In order to realize the purpose, the utility model discloses a technical scheme be:
an economical thermal imaging continuous zoom lens 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 to an image space in sequence;
the front fixed group has positive focal power, is a meniscus germanium single crystal positive lens with a convex surface facing an object space, is used as a first lens, and has spherical surface types;
the zoom group has negative focal power, is a biconcave germanium single crystal negative lens, and one side of the negative lens facing the object space is an aspheric surface and is used as a second lens, and the total movement stroke of the lenses is 11.32 mm;
the compensation group has positive focal power, is a biconvex germanium single crystal positive lens, is used as a third lens, and has a diffractive aspheric surface on one side facing an object space, and the total movement stroke of the lens is 20.88 mm;
the rear fixed group has negative focal power, is a meniscus germanium single crystal positive lens with a convex surface facing the object space, and is used as a fourth lens, and the convex surface of the fourth lens is an aspheric surface;
the focusing group has positive focal power, is a meniscus germanium single crystal positive lens with a convex surface facing to an image space, is used as a fifth lens, and has a concave surface which is an aspheric surface, and the total movement stroke of the lenses is 2.45 mm;
a long-wave uncooled detector part is arranged behind the focusing group and comprises a protection window and an image surface; the aperture diaphragm is a compensation group and is kept constant in the zooming process.
The lens satisfies the following parameters:
the effective focal length EFL of the lens is 35-105 mm, the F number is 1.4, the total length of the optical system is 160mm, the adaptive detector resolution is 640 multiplied by 512, and the pixel size is 17 mu m.
The horizontal field angle range of the lens is as follows: 2w is 35.5 to 11.8 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＝Α1ρ2+Α3ρ6
wherein phiThe phase of the diffraction plane, rho ═ r/rn,rnIs the planned radius of the diffraction plane, A1、A3Is 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 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 zoom ratio of 3 times, the total length of the optical system is 160mm, and the maximum aperture is 85 mm. The structure is compact, the zooming curve is smooth, and the maximum movement amount of the lens is 20.88 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. The imaging quality was excellent throughout the zoom range, with an average MTF of >0.55@20lp/mm for the full field of view.
Drawings
Fig. 1 is an optical system diagram of the economical thermal imaging zoom lens system with a focal length of 105 mm;
fig. 2 is a dot-column diagram of the economical thermal imaging zoom lens with a focal length of 105 mm;
FIG. 3 is a graph of the optical transfer function of the economical thermal imaging zoom lens system having a focal length of 105mm (a cut-off resolution of 20 lp/mm);
fig. 4 is a field curvature distortion diagram of the economical thermal imaging zoom lens with a focal length of 105 mm;
fig. 5 is an optical system diagram of the economical thermal imaging zoom lens system with a focal length of 35 mm;
fig. 6 is a dot-column diagram of the economical thermal imaging zoom lens with a focal length of 35 mm;
fig. 7 is an optical transfer function diagram (with a cut-off resolution of 20lp/mm) when the focal length of the economical thermal imaging zoom lens is 35 mm;
fig. 8 is a field curvature distortion diagram of the economical thermal imaging zoom lens system provided by the present invention when the focal length is 35 mm;
the lens comprises a lens body, a front fixing group, a rear fixing group, a focusing group, a detector protection window, an image plane and S1-S10, wherein the lens body comprises 100-object space, an L1-front fixing group, an L2-zooming group, an L3-compensation group, an L4-rear fixing group, an L5-focusing group, the detector protection window is 101-, the image plane is 102-, and the 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 present invention applied to a long-wave non-refrigerated 17 μm staring focal plane detector with 640 × 512 pixel size.
Fig. 1 and fig. 5 are diagrams of an optical system of the present invention at a focal length of 105mm and 35mm, 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 implementation is composed of a front fixed group L1 of positive power, a variable power group L2 of negative power, a compensation group L3 of positive power, a rear fixed group L4 of negative power, a focusing group L5 of positive power, and finally detectors 101, 102.
The front fixed group L1, i.e., the first lens, is a positive lens with a convex surface facing the object space, and is made of germanium single crystal, and both surfaces thereof are spherical. The second lens of the variable power group L2 is a biconcave negative lens, the material is germanium single crystal, the surface of S3 is aspheric surface, the lens is a movable lens which plays a role of variable power in zooming process, the moving curve is 5 times of parabola, and the total moving stroke is 11.32 mm. The compensation group L3 is a third lens, which is a biconvex positive lens made of germanium single crystal, the surface of S5 is a diffractive aspheric surface, the lens is a movable lens, when the zoom group lens moves, the compensation group lens moves correspondingly to ensure that the position of an image plane is unchanged, a moving curve is a straight line, and the total moving stroke is 20.88 mm. The rear fixed group L4, i.e., the fourth lens, is a meniscus negative lens with the convex surface facing the object, the material is germanium single crystal, and the surface of S7 is aspheric. The focusing group L5, i.e., the fifth lens, is a meniscus positive lens with the convex surface facing the image space, the material is germanium single crystal, the surface S9 is aspheric, and the lens is a moving lens which can be used for refocusing when the target distance and the working temperature change, and the total moving stroke is 2.45 mm. The long-wave uncooled detector includes: the protection window 101, the imaging plane 102, the resolution is 640 x 512, and the pixel size is 17 μm x 17 μm.
In the five 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-S10 are plated with antireflection films.
Table 1 does the utility model discloses at focus 105mm, optical structure parameter when 35 mm:
TABLE 1
The aspheric surfaces mentioned in the above five lenses are all even aspheric surfaces, and the expression 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 S3, S5, S7, S9:
TABLE 2
| Surface of | 4th | 6th | 8th | 10th | 12th |
| S3 | 6.759E-7 | 2.997E-9 | -1.858E-11 | 6.058E-14 | -7.862E-17 |
| S5 | -1.438E-7 | 2.678E-10 | -1.328E-12 | 2.573E-15 | -1.858E-18 |
| S7 | -1.553E-6 | -3.214E-9 | 9.825E-12 | -4.259E-14 | 4.465E-17 |
| S9 | -1.132E-6 | -1.613E-9 | 1.252E-11 | -3.16E-14 | 3.127E-17 |
The diffraction surfaces mentioned in the above five lenses are expressed as follows:
Φ＝Α1ρ2+Α3ρ6
where phi is the phase of the diffraction plane and p is r/rn,rnIs the planned radius of the diffraction plane, A1、A3Is the phase coefficient of the diffraction plane.
Table 3 is the diffraction coefficient of surface S5;
TABLE 3
| Surface of | A1 | A3 |
| S5 | -8.442 | -0.513 |
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 graphs of the specific embodiment of the economical thermal imaging zoom lens system of fig. 1 in a telephoto state, fig. 2 is a point diagram, fig. 3 is an MTF graph, and fig. 4 is a field curvature distortion graph;
FIG. 6 is a diagram illustrating aberration analysis of the exemplary embodiment of the longwave infrared zoom lens of FIG. 5 in a short focus state, FIG. 6 is a plot, FIG. 7 is an MTF plot, and FIG. 8 is a field curvature distortion plot;
it can be found from the figure that various aberrations of each focal segment are well corrected, the diffuse speckles are all corrected to be close to the size of the Airy spots, the MTF is close to the diffraction limit, and the distortion is less than 2.5%.
The effective focal length EFL of the lens is 35-105 mm, the F number is 1.4, the total length of the optical system is 160mm, the adaptive detector resolution is 640 multiplied by 512, and the pixel size is 17 mu m. The horizontal field angle range of the lens is as follows: 2w is 35.5 to 11.8 degrees.
Therefore, the utility model discloses economical thermal imaging continuous zoom has good image quality.
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. An economical thermal imaging continuous zoom lens is 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 to an image space in sequence;
the front fixed group has positive focal power, is a meniscus germanium single crystal positive lens with a convex surface facing an object space, is used as a first lens, and has spherical surface types;
the zoom group has negative focal power, is a biconcave germanium single crystal negative lens, and one side of the negative lens facing the object space is an aspheric surface and is used as a second lens, and the total movement stroke of the lenses is 11.32 mm;
the compensation group has positive focal power, is a biconvex germanium single crystal positive lens, is used as a third lens, and has a diffractive aspheric surface on one side facing an object space, and the total movement stroke of the lens is 20.88 mm;
the rear fixed group has negative focal power, is a meniscus germanium single crystal positive lens with a convex surface facing the object space, and is used as a fourth lens, and the convex surface of the fourth lens is an aspheric surface;
the focusing group has positive focal power, is a meniscus germanium single crystal positive lens with a convex surface facing to an image space, is used as a fifth lens, and has a concave surface which is an aspheric surface, and the total movement stroke of the lenses is 2.45 mm;
a long-wave uncooled detector part is arranged behind the focusing group and comprises a protection window and an image surface; the aperture diaphragm is a compensation group and is kept constant in the zooming process.
2. The economical thermal imaging zoom lens system according to claim 1, wherein the lens satisfies the following parameters:
the effective focal length EFL of the lens is 35-105 mm, the F number is 1.4, the total length of the optical system is 160mm, the adaptive detector resolution is 640 multiplied by 512, and the pixel size is 17 mu m.
3. The economical thermal imaging zoom lens system according to claim 1, wherein the horizontal field angle range of the lens is: 2w is 35.5 to 11.8 degrees.
4. The economical thermal imaging zoom lens system according to claim 1, wherein the aspherical surface in the lens element 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 thermal imaging zoom lens system according to claim 1, wherein the diffraction surface in the lens element satisfies the following expression:
Φ＝Α1ρ2+Α3ρ6
where Φ is the phase of the diffraction plane, and ρ is r/rn,rnIs the planned radius of the diffraction plane, A1、A3Is the phase coefficient of the diffraction plane.
6. The economical thermal imaging zoom lens system of claim 1, wherein the surface of the first lens near the object side is coated with a diamond-like carbon film.
7. The economical thermal imaging zoom lens system of claim 1, wherein the average MTF of the full field of view of the lens is >0.55@20 lp/mm.
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| CN201920983058.0U CN210090813U (en) | 2019-06-27 | 2019-06-27 | Economical thermal imaging continuous zoom lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684598A (en) * | 2021-01-19 | 2021-04-20 | 昆明云锗高新技术有限公司 | Compact uncooled long-wave infrared continuous zooming optical system |
| CN112859309A (en) * | 2020-11-12 | 2021-05-28 | 南京波长光电科技股份有限公司 | Lightweight small-focus unmanned aerial vehicle type long-wave zooming temperature measurement lens |
| CN115308890A (en) * | 2022-10-12 | 2022-11-08 | 昆明全波红外科技有限公司 | Compact type long-wave manual zooming infrared lens |
-
2019
- 2019-06-27 CN CN201920983058.0U patent/CN210090813U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112859309A (en) * | 2020-11-12 | 2021-05-28 | 南京波长光电科技股份有限公司 | Lightweight small-focus unmanned aerial vehicle type long-wave zooming temperature measurement lens |
| CN112859309B (en) * | 2020-11-12 | 2022-05-24 | 南京波长光电科技股份有限公司 | Lightweight small-focus unmanned aerial vehicle type long-wave zooming temperature measurement lens |
| CN112684598A (en) * | 2021-01-19 | 2021-04-20 | 昆明云锗高新技术有限公司 | Compact uncooled long-wave infrared continuous zooming optical system |
| CN115308890A (en) * | 2022-10-12 | 2022-11-08 | 昆明全波红外科技有限公司 | Compact type long-wave manual zooming infrared lens |
| CN115308890B (en) * | 2022-10-12 | 2022-12-20 | 昆明全波红外科技有限公司 | Compact type long-wave manual zooming infrared lens |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An economical continuous zoom lens for thermal imaging Effective date of registration: 20220617 Granted publication date: 20200218 Pledgee: Bank of China Limited Yanjiao branch Pledgor: SANHE LENSTEC PHOTOELECTRIC TECHNOLOGY CO.,LTD. Registration number: Y2022990000337 |
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Date of cancellation: 20230323 Granted publication date: 20200218 Pledgee: Bank of China Limited Yanjiao branch Pledgor: SANHE LENSTEC PHOTOELECTRIC TECHNOLOGY CO.,LTD. Registration number: Y2022990000337 |
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| CU01 | Correction of utility model |
Correction item: Pledgee Correct: Bank of China Limited Yanjiao Branch False: Bank of China Limited Yanjiao Branch Number: 15-02 Volume: 39 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An economical thermal imaging continuous zoom lens Effective date of registration: 20230329 Granted publication date: 20200218 Pledgee: Bank of China Limited Yanjiao Branch Pledgor: SANHE LENSTEC PHOTOELECTRIC TECHNOLOGY CO.,LTD. Registration number: Y2023990000179 |
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| CP03 | Change of name, title or address |
Address after: 065201 Factory Building L03-G, Baishi Jingu Yanjiao International Industrial Base, Yanjiao Development Zone, Sanhe City, Langfang City, Hebei Province Patentee after: Hebei Lansitek Optoelectronic Technology Co.,Ltd. Country or region after: China Address before: 065201 Factory Building L03-G, Baishi Jingu Yanjiao International Industrial Base, Yanjiao Development Zone, Sanhe City, Langfang City, Hebei Province Patentee before: SANHE LENSTEC PHOTOELECTRIC TECHNOLOGY CO.,LTD. Country or region before: China |