CN114415357A - Miniaturized medium-wave refrigeration infrared continuous zooming optical system with focal length of 15mm-250mm - Google Patents
Miniaturized medium-wave refrigeration infrared continuous zooming optical system with focal length of 15mm-250mm Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 54
- 238000005057 refrigeration Methods 0.000 title claims abstract description 36
- 238000003384 imaging method Methods 0.000 claims abstract description 18
- 239000002210 silicon-based material Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000013078 crystal Substances 0.000 claims abstract description 8
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 8
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 8
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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
- G02B15/145—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 having five groups only
- G02B15/1451—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 having five groups only the first group being positive
- G02B15/145121—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 having five groups only the first group being positive arranged +-+-+
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- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
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- G02B15/00—Optical objectives with means for varying the magnification
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- G02B15/145—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 having five groups only
- G02B15/1451—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 having five groups only the first group being positive
- G02B15/145129—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 having five groups only the first group being positive arranged +-+++
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Abstract
The invention discloses a miniaturized medium wave refrigeration infrared continuous zooming optical system with a focal length of 15mm-250mm, which comprises a front fixed group, a zoom group, a compensation group, a rear fixed group and a secondary imaging lens group, wherein the front fixed group, the zoom group, the compensation group, the rear fixed group and the secondary imaging lens group are sequentially arranged along the propagation direction of a light path; the front fixed group is a first lens with positive diopter and made of silicon material; the zoom group is a second lens with negative diopter and is made of a single crystal germanium material; the compensation group is a third lens with positive diopter and made of silicon material; the rear fixed group consists of a fourth lens with positive diopter and a fifth lens with negative diopter, the fourth lens is made of silicon materials, and the fifth lens is made of single crystal germanium materials; the secondary imaging lens group is a sixth lens with positive diopter and made of silicon materials; the air interval between the front fixed group and the zooming group is 15.2-35.1 mm; the air interval between the zooming group and the compensation group is 35.7-2.1 mm; the air space between the compensation group and the rear fixed group is 2-17.8 mm. The invention has less lens number and small total length; the zoom can be realized, and the imaging quality is clear.
Description
Technical Field
The invention relates to a miniaturized medium-wave refrigeration infrared continuous zooming optical system with a focal length of 15mm-250mm, and belongs to the technical field of optics.
Background
In recent years, with the continuous development of infrared technology, various infrared detection materials and component technologies are gradually mature, and the infrared technology is widely applied to numerous fields such as civil aviation, security, frontier defense, industry, building, traffic, outdoor and automation.
The infrared atmospheric window has three wave bands of 1-3 microns (short wave), 3-5 microns (medium wave) and 8-14 microns (long wave), wherein the application of the medium wave infrared (3 microns-5 microns) detection system is more advantageous, and the medium wave infrared detection system plays an important role in multiple aspects of atmospheric monitoring, gas detection, infrared countermeasure and the like. Meanwhile, the medium-wave infrared military infrared detection field has great research value, and especially has wide research prospects in the aspects of infrared thermal imaging and infrared guidance.
At present, infrared imaging components are developing towards miniaturization and high resolution, and a medium-wave infrared continuous zooming infrared system also becomes a research focus. For reference, patent CN202021233714.4 discloses a light and small medium-wave infrared refrigeration zoom lens, in which the effective focal length EFL is 30-240 mm (variable power 8 ×), and the total length of the optical system is 142 mm; in addition, the zoom lens disclosed in CN201821513144.7 has as many as 8 lenses, and the infrared zoom lens disclosed in these patents has the problems of large size, small zoom number, low system transmittance due to too many lenses, high cost, etc., which is contrary to the miniaturization trend of the infrared imaging engine.
Disclosure of Invention
The invention provides a miniaturized medium-wave refrigeration infrared continuous zooming optical system with a focal length of 15mm-250mm, which is suitable for a medium-wave infrared refrigeration detector and has the characteristics of short overall length, high optical transmittance and excellent imaging.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a miniaturized medium-wave refrigeration infrared continuous zooming optical system with a focal length of 15mm-250mm comprises a front fixed group, a zoom group, a compensation group, a rear fixed group and a secondary imaging lens group which are sequentially arranged along the propagation direction of an optical path;
the front fixed group is a first lens with positive diopter, and the first lens is made of silicon material; the zoom group is a second lens with negative diopter, and the second lens is made of a single crystal germanium material; the compensation group is a third lens with positive diopter, and the third lens is made of silicon material; along the propagation direction of the light path, the rear fixed group consists of a fourth lens with positive diopter and a fifth lens with negative diopter, the fourth lens is made of silicon materials, and the fifth lens is made of single crystal germanium materials; the secondary imaging lens group is a sixth lens with positive diopter, and the sixth lens is made of silicon material;
the air interval between the front fixed group and the zooming group is 15.2-35.1 mm; the air interval between the zooming group and the compensation group is 35.7-2.1 mm; the air interval between the compensation group and the rear fixed group is 2-17.8 mm;
the first lens entrance surface S1 is a spherical surface, and the exit surface S2 is a diffraction surface; the second lens entrance surface S3 is a spherical surface, and the exit surface S4 is an aspheric surface; the third lens entrance surface S5 is aspheric, and the exit surface S6 is spherical; the fourth lens entrance surface S7 is aspheric, and the exit surface S8 is spherical; the fifth lens entrance surface S9 is a spherical surface, and the exit surface S10 is an aspherical surface; the sixth lens entrance surface S11 is a diffraction surface, and the exit surface S12 is a spherical surface.
The total length T of the miniaturized medium wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm is less than 120 mm.
The miniaturized medium-wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm is suitable for medium-wave infrared bands of 3-5 microns, and the focal length is 15mm-250 mm.
In order to further improve the imaging effect, the air space between the fourth lens and the fifth lens is 0.43 +/-0.02 mm; the air space between the fifth lens and the sixth lens is 15.37 ± 0.02 mm.
In order to take imaging effect and imaging stability into consideration, the central thickness of the first lens is 7.50 +/-0.02 mm; the central thickness of the second lens is 1.60 +/-0.02 mm; the center thickness of the third lens is 3.80 +/-0.02 mm; the center thickness of the fourth lens is 3.20 +/-0.02 mm; the center thickness of the fifth lens is 5.30 +/-0.02 mm; the center thickness of the sixth lens is 3.00 + -0.02 mm.
In order to further better ensure the imaging effect, the curvature radius of the first lens entrance surface S1 is 63.20 ± 0.01mm, and the curvature radius of the first lens exit surface S2 is 132.31 ± 0.01 mm; the curvature radius of the second lens incidence surface S3 is-75.49 +/-0.01 mm, and the curvature radius of the second lens exit surface S4 is 33.45 +/-0.01 mm; the curvature radius of the third lens incidence surface S5 is 98.32 +/-0.01 mm, and the curvature radius of the third lens exit surface S6 is-53.02 +/-0.01 mm; the curvature radius of the fourth lens incidence surface S7 is 13.46 +/-0.01 mm, and the curvature radius of the fourth lens exit surface S8 is 34.33 +/-0.01 mm; the curvature radius of the fifth lens incidence surface S9 is 27.08 +/-0.01 mm, and the curvature radius of the fifth lens exit surface S10 is 7.32 +/-0.01 mm; the radius of curvature of the sixth lens entrance surface S11 is 33.39 + -0.01 mm, and the radius of curvature of the sixth lens exit surface S12 is-25.57 + -0.01 mm. The outer diameter of the first lens is 68-70.5mm, the outer diameter of the second lens is 21.6-22mm, the outer diameter of the third lens is 25mm, the outer diameter of the fourth lens is 14.8-16.6mm, the outer diameter of the fifth lens is 10-15mm, and the outer diameter of the sixth lens is 14mm.
The above-mentioned non-curved surface satisfies the following expression:
wherein Z (Y) is a lens run-out of the aspherical surface in the optical axis direction; r is the radius of curvature of the lens; y is a half aperture of the lens perpendicular to the optical axis direction; k is the conic coefficient; A. b, C, D, E are aspheric coefficients;
the diffraction plane satisfies the expression:
wherein the content of the first and second substances,
is the phase of the diffraction plane; y is a half aperture of the lens perpendicular to the optical axis direction; a1 and A2 are diffraction plane phase coefficients.
The miniaturized medium-wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm is suitable for a medium-wave infrared refrigeration detector, the number of the detectors F is 4.0, the detector pixel array is 640x512, the pixel size is 15 mu m, and the miniaturized medium-wave refrigeration optical system is compatible with a 320x256 detector area array 30 mu m pixel medium-wave refrigeration detector.
The prior art is referred to in the art for techniques not mentioned in the present invention.
The miniaturized medium-wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm uses 6 lenses, has less number, simple, compact and reasonable structure and low cost, and the total length T of the optical system is less than 120 mm; the optical system can realize the variable multiple up to 16.7 times and has clear imaging quality.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a short focal state optical system;
FIG. 2 is a schematic diagram of a focal state optical system in an exemplary embodiment;
FIG. 3 is a schematic diagram of an exemplary embodiment of a tele state optical system;
FIG. 4 is a graph of an embodiment short focus state MTF;
FIG. 5 is a graph of the focus state MTF for a particular embodiment;
FIG. 6 is a graph of an example embodiment tele state MTF;
FIG. 7 is a short focus state speckle pattern for an exemplary embodiment;
FIG. 8 is a diagram of in-focus speckle in an example embodiment;
FIG. 9 is a diagram of a tele state spot of an exemplary embodiment;
FIG. 10 is a field curvature distortion plot for the short focus state of the exemplary embodiment;
FIG. 11 is a field curvature distortion plot for the focal state in an exemplary embodiment;
FIG. 12 is a field curvature distortion plot for the tele state of the example embodiment.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
As shown in fig. 1-3, a miniaturized medium wave refrigeration infrared continuous zooming optical system with a focal length of 15mm-250mm comprises a front fixed group, a zoom group, a compensation group, a rear fixed group and a secondary imaging lens group which are sequentially arranged along the propagation direction of an optical path;
the front fixed group is a first lens with positive diopter, and the first lens is made of silicon material; the zoom group is a second lens with negative diopter, and the second lens is made of a single crystal germanium material; the compensation group is a third lens with positive diopter, and the third lens is made of silicon material; along the propagation direction of the light path, the rear fixed group consists of a fourth lens with positive diopter and a fifth lens with negative diopter, the fourth lens is made of silicon materials, and the fifth lens is made of single crystal germanium materials; the secondary imaging lens group is a sixth lens with positive diopter, and the sixth lens is made of silicon material;
the air interval between the front fixed group and the zooming group is 15.2-35.1 mm; the air interval between the zooming group and the compensation group is 35.7-2.1 mm; the air interval between the compensation group and the rear fixed group is 2-17.8 mm; the air space between the fourth lens and the fifth lens is 0.43 mm; the air space between the fifth lens and the sixth lens is 15.37 mm.
The first lens entrance surface S1 is a spherical surface, and the exit surface S2 is a diffraction surface; the second lens entrance surface S3 is a spherical surface, and the exit surface S4 is an aspheric surface; the third lens entrance surface S5 is aspheric, and the exit surface S6 is spherical; the fourth lens entrance surface S7 is aspheric, and the exit surface S8 is spherical; the fifth lens entrance surface S9 is a spherical surface, and the exit surface S10 is an aspherical surface; the sixth lens entrance surface S11 is a diffraction surface, and the exit surface S12 is a spherical surface. The radius of curvature of the first lens entrance surface S1 is 63.20mm, and the radius of curvature of the first lens exit surface S2 is 132.31 mm; the radius of curvature of the second lens entrance surface S3 is-75.49 mm, and the radius of curvature of the second lens exit surface S4 is 33.45 mm; the radius of curvature of the third lens entrance surface S5 is 98.32mm, and the radius of curvature of the third lens exit surface S6 is-53.02 mm; the radius of curvature of the fourth lens entrance surface S7 is 13.46mm, and the radius of curvature of the fourth lens exit surface S8 is 34.33 mm; the radius of curvature of the fifth lens entrance surface S9 is 27.08mm, and the radius of curvature of the fifth lens exit surface S10 is 7.32 mm; the radius of curvature of the sixth lens entrance surface S11 was 33.39mm, and the radius of curvature of the sixth lens exit surface S12 was-25.57 mm. The center thickness of the first lens is 7.50 mm; the center thickness of the second lens is 1.60 mm; the center thickness of the third lens is 3.80 mm; the center thickness of the fourth lens is 3.20 mm; the center thickness of the fifth lens is 5.30 mm; the center thickness of the sixth lens was 3.00 mm.
The miniaturized medium-wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm has the total length T of less than 120mm, is suitable for medium-wave infrared wave bands of 3-5 mu m, the focal length of 15mm-250mm, the number of detectors F of 4.0, the detectors are medium-wave refrigeration detectors, the pixel array of the detectors is 640x512, the pixel size of 15 mu m, and the miniaturized medium-wave refrigeration infrared continuous zooming optical system is compatible with a 320x256 detector area array and a 30 mu m pixel medium-wave refrigeration detector.
The optical system parameters of this example are shown in tables 1, 2 and 3.
Table 1 is a parameter table of optical elements
Aspheric equation used in Table 1
The meaning of the quantities in the equation is as follows:
z (Y) is a lens run-out of the aspherical surface in the optical axis direction;
r is the radius of curvature of the lens;
y is a half aperture of the lens perpendicular to the optical axis direction;
k is the conic coefficient;
A. b, C, D, E are aspherical coefficients, see table 2 for specific data.
Table 2 shows aspherical coefficients of examples
| Aspherical surface | K | A | B | C | | E |
| S2 | ||||||
| 0 | 1.55E-07 | -1.71E-11 | ||||
| S4 | 0 | -2.52E-05 | 5.60E-08 | -2.73E-10 | 8.39E-13 | |
| S5 | 0 | -4.53E-06 | 1.57E-09 | 9.99E-12 | ||
| S7 | 0 | -4.91E-05 | 4.24E-07 | -1.22E-09 | -2.81E-11 | 3.67E-13 |
| S10 | 0 | -1.46E-03 | 1.49E-05 | 1.37E-06 | ||
| S11 | 0 | -1.58E-04 | 7.56E-07 | -1.79E-09 |
Table 3 shows the diffraction surface coefficients of the examples
| Diffraction surface | Diffraction orders | Center wavelength | A1 | A2 |
| S2 | 34.00 | 4μm | -18.40 | -10.34 |
| S11 | 7.00 | 4μm | -53.32 | 4.62 |
The expression adopted by the above diffraction planes is:
the meanings of the amounts in the expression are as follows:
y is a half aperture of the lens perpendicular to the optical axis direction;
a1 and A2 are diffraction plane phase coefficients.
Fig. 1-3 are optical path diagrams of the miniaturized medium wave refrigeration infrared continuous zooming optical system with focal length of 15mm-250mm at short focus (focal length of 15mm), medium focus (focal length of 90mm) and long focus (focal length of 250mm), respectively.
Fig. 4-6 are graphs (MTF @20lp/mm) of optical transfer functions of the miniaturized medium-wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm at a short focus (the focal length is 15mm), a medium focus (the focal length is 90mm) and a long focus (the focal length is 250mm), respectively. Fig. 7-9 are diagrams of spots of the above-mentioned miniaturized medium-wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm in short focus (focal length of 15mm), medium focus (focal length of 90mm), and long focus (focal length of 250mm), respectively. Fig. 10-12 are graphs of field curvature distortion of the miniaturized medium wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm in short focus (the focal length is 15mm), medium focus (the focal length is 90mm), and long focus (the focal length is 250mm), respectively, and it can be seen from fig. 4-12 that the aberration of the miniaturized medium wave refrigeration infrared continuous zooming optical system with the focal length of 15mm-250mm is well corrected, the optical performance is close to the diffraction limit of the system, the field curvature is less than 0.5%, the distortion is less than 4%, and the comprehensive optical path diagram analysis shows that the optical system is simple and stable, and the imaging quality is good.
In the embodiment, the total length T of the optical system is less than 120mm, the axial dimension is compact, the optical system can be used in various occasions with small optical load volume and light weight, and the optical system can realize the characteristics of large zoom, clear imaging quality and the like.
Claims (8)
1. A miniaturized medium wave refrigeration infrared continuous zooming optical system with a focal length of 15mm-250mm is characterized in that: the device comprises a front fixed group, a zoom group, a compensation group, a rear fixed group and a secondary imaging lens group which are sequentially arranged along the propagation direction of a light path;
the front fixed group is a first lens with positive diopter, and the first lens is made of silicon material; the zoom group is a second lens with negative diopter, and the second lens is made of a single crystal germanium material; the compensation group is a third lens with positive diopter, and the third lens is made of silicon material; along the propagation direction of the light path, the rear fixed group consists of a fourth lens with positive diopter and a fifth lens with negative diopter, the fourth lens is made of silicon materials, and the fifth lens is made of single crystal germanium materials; the secondary imaging lens group is a sixth lens with positive diopter, and the sixth lens is made of silicon material;
the air interval between the front fixed group and the zooming group is 15.2-35.1 mm; the air interval between the zooming group and the compensation group is 35.7-2.1 mm; the air interval between the compensation group and the rear fixed group is 2-17.8 mm;
the first lens entrance surface S1 is a spherical surface, and the exit surface S2 is a diffraction surface; the second lens entrance surface S3 is a spherical surface, and the exit surface S4 is an aspheric surface; the third lens entrance surface S5 is aspheric, and the exit surface S6 is spherical; the fourth lens entrance surface S7 is aspheric, and the exit surface S8 is spherical; the fifth lens entrance surface S9 is a spherical surface, and the exit surface S10 is an aspherical surface; the sixth lens entrance surface S11 is a diffraction surface, and the exit surface S12 is a spherical surface.
2. The miniaturized medium wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm as claimed in claim 1, wherein: the total length T of the optical system is less than 120 mm.
3. The miniaturized medium wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm as claimed in claim 1 or 2, characterized in that: is suitable for medium-wave infrared band 3-5 μm, and has focal length of 15-250 mm.
4. The miniaturized medium wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm as claimed in claim 1 or 2, characterized in that: the air space between the fourth lens and the fifth lens is 0.43 +/-0.02 mm; the air space between the fifth lens and the sixth lens is 15.37 ± 0.02 mm.
5. The miniaturized medium wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm as claimed in claim 1 or 2, characterized in that: the central thickness of the first lens is 7.50 +/-0.02 mm; the central thickness of the second lens is 1.60 +/-0.02 mm; the center thickness of the third lens is 3.80 +/-0.02 mm; the center thickness of the fourth lens is 3.20 +/-0.02 mm; the center thickness of the fifth lens is 5.30 +/-0.02 mm; the center thickness of the sixth lens is 3.00 + -0.02 mm.
6. The miniaturized medium wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm as claimed in claim 1 or 2, characterized in that: the curvature radius of the first lens incidence surface S1 is 63.20 +/-0.01 mm, and the curvature radius of the first lens exit surface S2 is 132.31 +/-0.01 mm; the curvature radius of the second lens incidence surface S3 is-75.49 +/-0.01 mm, and the curvature radius of the second lens exit surface S4 is 33.45 +/-0.01 mm; the curvature radius of the third lens incidence surface S5 is 98.32 +/-0.01 mm, and the curvature radius of the third lens exit surface S6 is-53.02 +/-0.01 mm; the curvature radius of the fourth lens incidence surface S7 is 13.46 +/-0.01 mm, and the curvature radius of the fourth lens exit surface S8 is 34.33 +/-0.01 mm; the curvature radius of the fifth lens incidence surface S9 is 27.08 +/-0.01 mm, and the curvature radius of the fifth lens exit surface S10 is 7.32 +/-0.01 mm; the radius of curvature of the sixth lens entrance surface S11 is 33.39 + -0.01 mm, and the radius of curvature of the sixth lens exit surface S12 is-25.57 + -0.01 mm.
7. The miniaturized medium wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm as claimed in claim 1 or 2, characterized in that: the outer diameter of the first lens is 68-70.5mm, the outer diameter of the second lens is 21.6-22mm, the outer diameter of the third lens is 25mm, the outer diameter of the fourth lens is 14.8-16.6mm, the outer diameter of the fifth lens is 10-15mm, and the outer diameter of the sixth lens is 14mm.
8. The miniaturized medium wave refrigeration infrared continuous zoom optical system with focal length of 15mm-250mm as claimed in claim 1 or 2, characterized in that: the medium wave refrigeration detector is suitable for a medium wave infrared refrigeration detector, a detector pixel array is 640x512, the pixel size is 15 mu m, and the medium wave refrigeration detector is compatible with a 320x256 detector area array and 30 mu m pixels.
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|---|---|---|---|---|
| JP2003344764A (en) * | 2002-05-23 | 2003-12-03 | Enplas Corp | Zoom lens |
| JP2014098743A (en) * | 2012-11-13 | 2014-05-29 | Canon Inc | Zoom lens and image capturing device having the same |
| CN111025608A (en) * | 2019-12-05 | 2020-04-17 | 湖北久之洋红外系统股份有限公司 | Ultra-compact continuous zooming medium-wave infrared optical system |
| CN210514769U (en) * | 2019-08-13 | 2020-05-12 | 福建福光天瞳光学有限公司 | Non-refrigeration type long-wave infrared continuous zoom lens |
| CN214474203U (en) * | 2021-04-13 | 2021-10-22 | 昆明南旭光电技术有限公司 | Compact double-field-of-view refrigeration infrared objective lens |
-
2021
- 2021-12-20 CN CN202111562807.0A patent/CN114415357B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003344764A (en) * | 2002-05-23 | 2003-12-03 | Enplas Corp | Zoom lens |
| JP2014098743A (en) * | 2012-11-13 | 2014-05-29 | Canon Inc | Zoom lens and image capturing device having the same |
| CN210514769U (en) * | 2019-08-13 | 2020-05-12 | 福建福光天瞳光学有限公司 | Non-refrigeration type long-wave infrared continuous zoom lens |
| CN111025608A (en) * | 2019-12-05 | 2020-04-17 | 湖北久之洋红外系统股份有限公司 | Ultra-compact continuous zooming medium-wave infrared optical system |
| CN214474203U (en) * | 2021-04-13 | 2021-10-22 | 昆明南旭光电技术有限公司 | Compact double-field-of-view refrigeration infrared objective lens |
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