CN208110150U - A kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens - Google Patents
A kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens Download PDFInfo
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- CN208110150U CN208110150U CN201820669996.9U CN201820669996U CN208110150U CN 208110150 U CN208110150 U CN 208110150U CN 201820669996 U CN201820669996 U CN 201820669996U CN 208110150 U CN208110150 U CN 208110150U
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Abstract
The utility model discloses a kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lenses, including the first lens, the second lens, the third lens and the 4th lens being arranged successively from object side to target surface；Wherein, the first lens are negative-power lenses of the convex surface towards object side；Second lens are positive power lens of the convex surface towards object side；The third lens are negative-power lenses of the convex surface towards object side；4th lens are positive power lens of the convex surface towards object side.The utility model uses PASSIVE OPTICAL athermal technology, and diagonal angles of visual field can achieve 180 °, -40 °~+60 ° of range of temperature, be suitable for the biggish occasions of range of temperature such as forest fire protection monitoring, public security, frontier defense warning, high reliablity；It is big that breadth is imaged, can be used for 640 machine cores, optical system light passing amount is big.
Description
Technical field
The utility model relates to a kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lenses, belong to passive athermal
Fish eye lens field.
Background technique
LONG WAVE INFRARED fish eye lens is the special lens that a kind of field angle can reach 180 degree or more, monitor in forest fire protection,
Public security, frontier defense warning etc. play a significant role, big in these special occasions range of temperature, lead to optical system target surface
Decline with temperature drift image quality, it is necessary to which athermal design is used to optical system；
106547074 A of CN discloses a kind of infrared fish eye lens of five chips；CN204462517 U discloses one kind three
150 degree of flake LONG WAVE INFRARED camera lenses of chip, both of the above is all without reference to PASSIVE OPTICAL athermal technology；
The athermal lens field angle announced in the prior art is smaller or machine core target surface is small, such as：CN 103852863A is announced
Field angle be about 35 °；The field angle that CN103995344A is announced is about 15.24 ° x11.46 °；What CN 106405800A was announced
Detector：LWIR Uncooled type 160*120,25um, 43 ° x32 ° of field angle.
The passive athermal infrared optical lens of wide angle optical and in October, 2014 that 201096959 Y of CN is announced are paid
Jump just et al.《Infrared and laser engineering》It is delivered on Vol.43No.10《The infrared fish eye optical systems of two waveband athermal are set
Meter》It is designed for refrigeration mode machine core, to guarantee 100% cold stop efficiency, by the cold screen weight of the aperture diaphragm of system and machine core
It closes.With the continuous progress of technology, non-brake method LONG WAVE INFRARED machine core develops towards the high pixel of big target surface, while with field angle and phase
Increase to aperture, big visual field differ greatly with small field of view optical path track, lead to big target surface LONG WAVE INFRARED FISH EYE LENS OPTICS quilt
Dynamic athermal difficulty is larger, Fu Yuegang et al.《The infrared fish eye optical systems design of two waveband athermal》The F number of institute's public address system
(focal length/system aperture) is 2.68, has used 7 lens, image quality evaluation is general.
Utility model content
In order to solve the defects of athermal lens field angle is smaller in the prior art or machine core target surface is small, the utility model is mentioned
For a kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens, be it is a kind of suitable for the infrared machine core of 640x480 substantially
Face LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens, the application give a kind of big target surface LONG WAVE INFRARED FISH EYE LENS OPTICS quilt
Dynamic athermal solution is suitable for the biggish occasions of range of temperature such as forest fire protection monitoring, public security, frontier defense warning.
In order to solve the above technical problems, technical solution used by the utility model is as follows：
A kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens, including be arranged successively from object side to target surface
One lens, the second lens, the third lens and the 4th lens；
Wherein, the first lens are negative-power lenses of the convex surface towards object side；
Second lens are positive power lens of the convex surface towards object side；
The third lens are negative-power lenses of the convex surface towards object side；
4th lens are positive power lens of the convex surface towards object side.
Above-mentioned large format LONG WAVE INFRARED PASSIVE OPTICAL athermal flake mirror efficiently solves athermal lens in the prior art
The defects of field angle is smaller or machine core target surface is small.
Further, infrared fish eye lens focal length f ' is shorter, and to guarantee back work distance from BFL, the application is taken the photograph far using counter
Structure meets：BFL/f'>1.4；-3<f1'/f'<0；2<f2'/f'<4；Wherein, f1 ' is the focal length of the first lens；F2 ' is
Two, the combined focal length of three, four lens；F ' is camera lens combined focal length；BFL be back work distance from.
Back work distance is referred to as counter greater than the optical system of focal length to take the photograph remote type structure.
Further, for aberration correction and the influence of temperature change is eliminated, using germanium and chalcogenide glass material mating, first
Lens use high refractive index germanite glass, are conducive to aberration correction, while conveniently plating hard carbon films in front surface；Second lens, third
Lens and the 4th lens are all made of the chalcogenide glass with lower refractive index temperature variation coefficient dn/dT, become for eliminating temperature
Change the adverse effect to image quality.
Further, the applicable service band of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens is 8-12um.Light
The F number of system is equal to 1.0 (F/#=1.0), F/#=f '/D, and wherein f ' is system focal length, and D is system aperture diaphragm diameter, F
Number more mini system light passing amount is bigger.Diagonal angles of visual field is not less than 180 °, -40 °~+60 ° of range of temperature.
From the object side to the image side, the two sides of the first lens L1 is followed successively by object side S1 and image side surface S2 to above-mentioned camera lens；Second thoroughly
The two sides of mirror L2 is followed successively by object side S3 and image side surface S4；The two sides of the third lens L3 is followed successively by object side S5 and image side surface S6；
The two sides of 4th lens L4 is followed successively by object side S7 and image side surface S8；Object side S1 is spherical surface, and image side surface S2 is aspherical；Object side
Face S3 be it is aspherical, image side surface S4 be diffraction surfaces；Object side S5 be it is aspherical, image side surface S6 be it is aspherical；Object side S7 is non-
Spherical surface, image side surface S8 are aspherical.
In order to further ensure field angle and athermal effect, it is preferable that the radius of curvature of object side S1 be 61.43mm or
The radius of curvature of 36.24mm, image side surface S2 are 24.01mm or 19.38mm；The radius of curvature of object side S3 be 29.89mm or
The radius of curvature of 25.94mm, image side surface S4 are 1537.76mm or 53.75mm；The radius of curvature of object side S5 is -326.32mm
Or the radius of curvature of 37.32mm, image side surface S6 are 37.17mm or 40.22mm；The radius of curvature of object side S7 be 27.69mm or
The radius of curvature of 50.08mm, image side surface S8 are 82.02mm or 65.38mm.
In order to further ensure field angle, it is preferable that the outer diameter of object side S1 is 42mm or 52mm, and the outer diameter of image side surface S2 is
30mm or 38mm；The outer diameter of object side S3 is 30mm or 30mm, and the outer diameter of image side surface S4 is 30mm or 27mm；Object side S5's is outer
Diameter is 22mm or 22mm, and the outer diameter of image side surface S6 is 19mm or 21mm；The outer diameter of object side S7 is 19mm or 23mm, image side surface S8
Outer radius be 22mm or 23mm.
The outer diameter of each each side of lens refers to outer circle (round edge) diameter of each lens.
In order to further ensure imaging effect, it is preferable that the center thickness of the first lens is 5mm or 2.5mm, the second lens
Center thickness is 8mm, and the center thickness of the third lens is 2.5mm, and the center thickness of the 4th lens is 3.7mm or 5.3mm；First
44.2mm or 54.3mm is divided between lens and the second lens；7.5mm is divided between second lens and the third lens
Or 14.5mm；5mm or 1.7mm is divided between the third lens and the 4th lens.
Above-mentioned interval refers to the spacing between the center of the two adjacent surfaces of adjacent two lens.
The unmentioned technology of the utility model is referring to the prior art.
The utility model compared with prior art, has following advantage：
1. using PASSIVE OPTICAL athermal technology, system F number is equal to 1.0, and light passing amount is big；Diagonal angles of visual field can achieve
180 °, -40 °~+60 ° of range of temperature, be suitable for forest fire protection monitoring, public security, frontier defense warning etc. range of temperature compared with
Big occasion, high reliablity；
2. it is big that breadth is imaged, it can be used for 640 machine core of non-refrigeration type, optical system light passing amount is big；
3. further, first uses germanium, facilitate plating hard carbon films；Three pieces use chalcogenide glass afterwards, have in material cost
There is an apparent advantage, when mass production can carry out accurate die pressing, can reduce processing cost, wide market.
Detailed description of the invention
Fig. 1 is the 1 fish-eye structural schematic diagram of LONG WAVE INFRARED athermal of specific embodiment；
Fig. 2 is MTF curve figure of the specific embodiment 1 at 20 °；
Fig. 3 is MTF curve figure of the specific embodiment 1 at -40 °；
Fig. 4 is MTF curve figure of the specific embodiment 1 at 60 °；
Fig. 5 is the curvature of field and distortion figure of the specific embodiment 1 at 20 °；
Fig. 6 is the 2 fish-eye structural schematic diagram of LONG WAVE INFRARED athermal of specific embodiment；
Fig. 7 is MTF curve figure of the specific embodiment 2 at 20 °；
Fig. 8 is MTF curve figure of the specific embodiment 2 at -40 °；
Fig. 9 is MTF curve figure of the specific embodiment 2 at 60 °；
Figure 10 is the curvature of field and distortion figure of the specific embodiment 2 at 20 °；
Specific embodiment
The utility model in order to better understand furthers elucidate the content of the utility model below with reference to embodiment, but
The content of the utility model is not limited solely to the following examples.
Embodiment 1
Embodiment 1 is applicable in wave band 8-12um, F number 1.0, and 180 ° of diagonal angles of visual field
Large format LONG WAVE INFRARED athermal fish eye lens as shown in Figure 1, is arranged successively from object to image space along optical axis OO '：
The first lens L1 with negative power, the second lens L2 with positive light coke, the third lens L3 with negative power, tool
There are the 4th lens L4 and imaging surface S9 of positive light coke.
From the object side to the image side, the two sides of the first lens L1 is object side S1, image side surface S2；The two sides of second lens L2 is object
Side S3, image side surface S4；The two sides of the third lens L3 is object side S5, image side surface S6；4th two sides lens L4 be object side S7,
Image side surface S8；
First lens L1 uses germanium, and the refractive index of germanium is up to 4.0, facilitates aberration correction, facilitate plating hard carbon films in technique；
Second and third, four lens use chalcogenide glass, it is smaller that chalcogenide glass refractive index varies with temperature coefficient d n/dT, in light
Good athermal function may be implemented plus the distribution of reasonable focal power using chalcogenide glass in system.In material cost
With apparent advantage, when mass production, can carry out accurate die pressing, can reduce processing cost, wide market.
Above-mentioned optical system focal length f ' is shorter, is taken the photograph remote structure using counter and is guaranteed that back work distance from BFL, needs to meet
BFL/f'>1.4；
-3<f1'/f'<0；
2<f2’/f’<4
Wherein, f1 ' is the focal length of the first lens；F2 ' is second and third, the combined focal lengths of four lens；F ' is lens group focus
Away from；
Fig. 2 to Fig. 4 is above-mentioned optical system in -40 ° of temperature ,+20 ° ,+60 ° of optical transfer function curve graphs, represents optics
The comprehensive solution that system varies with temperature as horizontal, 17 μm of 640x480 (Pixel Dimensions) request detectors of cooperation reach 30 lines to point
Resolution；The LONG WAVE INFRARED optical system is by various optical aberration correctings as seen from the figure, it is sufficient to meet the requirement of PASSIVE OPTICAL athermal.Figure
5 be the curvature of field and distortion figure of the embodiment, and the curvature of field is less than 0.05mm, distortion 100%.
The design parameter of 1 embodiment 1 of table
Mirror surface serial number in upper table is corresponding with the mirror surface serial number in Fig. 1；The corresponding spacing of S1 refers to that the center of lens L1 is thick
Degree, the corresponding spacing of S2 refer to the spacing between the center of S2 and the center of S3, and the corresponding spacing of S3 refers to the center thickness of L2, S4 pairs
The spacing answered refers to the spacing between the center of S4 and the center of S5, and the corresponding spacing of S5 refers to the center thickness of L3, S6 corresponding
Spacing between center away from the center and S7 for referring to S6, the corresponding spacing of S7 refer to the center thickness of L4, and the corresponding spacing of S8 refers to S8
Center and S9 center between spacing；Outer diameter refers to the outside diameter of each mirror surface；
The aspherical equation used in table 1：
The meaning wherein respectively measured is as follows：
ZA：The aspherical lens rise along optical axis direction；
R：The radius of curvature on surface and optical axis OO ' point of intersection；
Y：Vertical lens are in half bore of optical axis direction；
k：Circular cone coefficient；
A, the face B, C, D, E coefficient；Specific coefficient is shown in Table 2
2 embodiment of table, 1 asphericity coefficient
| It is aspherical | K | A | B | C | D | E |
| S2 | 0 | 6.1524E-06 | 1.4483E-08 | 4.0109E-11 | -1.0301E-14 | 0.0000E+00 |
| S3 | 0 | -3.0638E-06 | -3.1206E-09 | -1.4950E-11 | 2.3336E-14 | -7.2790E-17 |
| S4 | 0 | 6.0031E-06 | -3.1708E-08 | 3.0993E-12 | -4.1018E-14 | 1.0558E-16 |
| S5 | 0 | 3.5979E-05 | 5.7854E-07 | -1.7845E-09 | 4.2412E-12 | 6.2941E-15 |
| S6 | 0 | -2.1740E-07 | 3.7535E-07 | -1.6010E-09 | 4.7633E-12 | -2.3518E-14 |
| S7 | 0 | -1.7351E-05 | -2.1554E-07 | -3.4582E-09 | -4.5131E-11 | 4.0909E-15 |
| S8 | 0 | -2.3900E-07 | -5.9903E-07 | -4.4707E-09 | 4.1554E-11 | 1.7745E-15 |
Table 3 is the diffraction surfaces coefficient of embodiment 1
Diffraction surfaces equation used by table 1 is：
Φ=A1Y2+A2Y4+A3Y6
Wherein：
Φ：For the position phase of diffraction surfaces；
Y：Vertical lens are in half bore of optical axis direction；
A1, A2, A3 diffraction surfaces phase coefficient.
Embodiment 2
As shown in fig. 6, it is substantially the same manner as Example 1, except that：When field angle further increases, increase by first
The curvature of lens L1, the present embodiment diagonal angles of visual field can achieve 184 °, wave band 8-12um, F number 1.0.
The design parameter of 4 embodiment 2 of table
Mirror surface serial number in upper table is corresponding with the mirror surface serial number in Fig. 6；The corresponding spacing of S1 refers to that the center of lens L1 is thick
Degree, the corresponding spacing of S2 refer to the spacing between the center of S2 and the center of S3, and the corresponding spacing of S3 refers to the center thickness of L2, S4 pairs
The spacing answered refers to the spacing between the center of S4 and the center of S5, and the corresponding spacing of S5 refers to the center thickness of L3, S6 corresponding
Spacing between center away from the center and S7 for referring to S6, the corresponding spacing of S7 refer to the center thickness of L4, and the corresponding spacing of S8 refers to S8
Center and S9 center between spacing；Outer diameter refers to the outside diameter of each mirror surface；
The aspherical equation used in table 4：
The meaning wherein respectively measured is as follows：
ZA：The aspherical lens rise along optical axis direction；
R：The radius of curvature on surface and optical axis OO ' point of intersection；
Y：Vertical lens are in half bore of optical axis direction；
k：Circular cone coefficient；
A, the face B, C, D, E coefficient；Specific coefficient is shown in Table 5
Table 5
| It is aspherical | K | A | B | C | D | E |
| S2 | 0 | -7.5441E-07 | 7.2758E-08 | -3.0958E-10 | 2.8644E-13 | -3.7771E-16 |
| S3 | 0 | 3.2900E-06 | -6.6684E-11 | -3.5349E-11 | 5.2302E-13 | -7.7637E-16 |
| S4 | 0 | 2.5551E-06 | -5.0328E-08 | 6.7899E-12 | -3.7085E-15 | -1.0221E-15 |
| S5 | 0 | -1.0902E-05 | -5.1116E-07 | -1.0263E-09 | 2.3462E-11 | -9.0051E-14 |
| S6 | 0 | -8.5944E-07 | -6.7085E-07 | 1.7643E-09 | -4.4825E-12 | 9.2697E-14 |
| S7 | 0 | 4.7857E-05 | -1.1506E-07 | -1.2690E-09 | -6.1174E-12 | 5.2086E-17 |
| S8 | 0 | -6.3695E-06 | -4.5595E-08 | -4.2723E-09 | 1.4049E-11 | 1.6082E-16 |
4 specific embodiment two of table is shown in Table 6 using diffraction surfaces coefficient
Table 6 is the diffraction surfaces coefficient of embodiment 2
Diffraction surfaces equation used by embodiment 2 is：
Φ=A1Y2+A2Y4+A3Y6
Wherein：
Φ：For the position phase of diffraction surfaces；
Y：Vertical lens are in half bore of optical axis direction；
A1, A2, A3 diffraction surfaces phase coefficient.
Fig. 7 to Fig. 8 is 2 optical system of embodiment in -40 ° of temperature ,+20 ° ,+60 ° of optical transfer function curve graphs, is represented
For the comprehensive solution that optical system varies with temperature as horizontal, cooperation 17 μm of request detectors of 640x480 reach 30 lines to resolution ratio；
The LONG WAVE INFRARED optical system is by various optical aberration correctings as seen from the figure, it is sufficient to meet the requirement of PASSIVE OPTICAL athermal.Figure 10 is
The curvature of field and distortion figure of the embodiment, the curvature of field are less than 0.1mm, distortion 100%.
Claims (10)
1. a kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens, it is characterised in that：Including from object side to target surface according to
The first lens, the second lens, the third lens and the 4th lens of secondary arrangement；
Wherein, the first lens are negative-power lenses of the convex surface towards object side；
Second lens are positive power lens of the convex surface towards object side；
The third lens are negative-power lenses of the convex surface towards object side；
4th lens are positive power lens of the convex surface towards object side.
2. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as described in claim 1, it is characterised in that：Using anti-
Take the photograph remote structure.
3. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in claim 2, it is characterised in that：Meet：
BFL/f'>1.4；-3<f1'/f'<0；2<f2'/f'<4；Wherein, f1 ' is the focal length of the first lens；F2 ' is second and third, four thoroughly
The combined focal length of mirror；F ' is camera lens combined focal length；BFL be back work distance from.
4. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in any one of claims 1-3, feature
It is：First lens use germanite glass；Second lens, the third lens and the 4th lens are all made of chalcogenide glass.
5. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in any one of claims 1-3, feature
It is：The large format fish-eye service band of LONG WAVE INFRARED PASSIVE OPTICAL athermal is 8-12um.
6. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in any one of claims 1-3, feature
It is：The F number of optical system is equal to 1.0, and diagonal angles of visual field is not less than 180 °, -40 °~+60 ° of range of temperature.
7. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in any one of claims 1-3, feature
It is：From the object side to the image side, the two sides of the first lens L1 is followed successively by object side S1 and image side surface S2；The two sides of second lens L2 according to
Secondary is object side S3 and image side surface S4；The two sides of the third lens L3 is followed successively by object side S5 and image side surface S6；4th lens L4's
Two sides is followed successively by object side S7 and image side surface S8；Object side S1 is spherical surface, and image side surface S2 is aspherical；Object side S3 is aspheric
Face, image side surface S4 are diffraction surfaces；Object side S5 be it is aspherical, image side surface S6 be it is aspherical；Object side S7 is aspherical, image side surface
S8 is aspherical.
8. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in claim 7, it is characterised in that：Object side
The radius of curvature of S1 is 61.43mm or 36.24mm, and the radius of curvature of image side surface S2 is 24.01mm or 19.38mm；Object side S3
Radius of curvature be 29.89mm or 25.94mm, the radius of curvature of image side surface S4 is 1537.76mm or 53.75mm；Object side S5
Radius of curvature be -326.32mm or 37.32mm, the radius of curvature of image side surface S6 is 37.17mm or 40.22mm；Object side S7
Radius of curvature be 27.69mm or 50.08mm, the radius of curvature of image side surface S8 is 82.02mm or 65.38mm.
9. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in claim 7, it is characterised in that：Object side
The outer diameter of S1 is 42mm or 52mm, and the outer diameter of image side surface S2 is 30mm or 38mm；The outer diameter of object side S3 is 30mm or 30mm, as
The outer diameter of side S4 is 30mm or 27mm；The outer diameter of object side S5 is 22mm or 22mm, the outer diameter of image side surface S6 be 19mm or
21mm；The outer diameter of object side S7 is 19mm or 23mm, and the outer radius of image side surface S8 is 22mm or 23mm.
10. large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens as claimed in any one of claims 1-3, feature
It is：The center thickness of first lens is 5mm or 2.5mm, and the center thickness of the second lens is 8mm, and the center of the third lens is thick
Degree is 2.5mm, and the center thickness of the 4th lens is 3.7mm or 5.3mm；It is divided between first lens and the second lens
44.2mm or 54.3mm；7.5mm or 14.5mm is divided between second lens and the third lens；The third lens and the 4th lens
Between between be divided into 5mm or 1.7mm.
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| CN201820669996.9U CN208110150U (en) | 2018-05-07 | 2018-05-07 | A kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens |
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| CN201820669996.9U CN208110150U (en) | 2018-05-07 | 2018-05-07 | A kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens |
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| CN208110150U true CN208110150U (en) | 2018-11-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108681032A (en) * | 2018-05-07 | 2018-10-19 | 南京波长光电科技股份有限公司 | A kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens |
| CN110955032A (en) * | 2020-01-03 | 2020-04-03 | 福建福光天瞳光学有限公司 | Large-target-surface high-resolution optical athermalization lens and working method thereof |
| CN111505800A (en) * | 2020-04-22 | 2020-08-07 | 南京波长光电科技股份有限公司 | 200mm fixed-focus lens without diffraction surface for 1.5-5.0 um high-frame frequency refrigeration type medium wave infrared core |
-
2018
- 2018-05-07 CN CN201820669996.9U patent/CN208110150U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108681032A (en) * | 2018-05-07 | 2018-10-19 | 南京波长光电科技股份有限公司 | A kind of large format LONG WAVE INFRARED PASSIVE OPTICAL athermal fish eye lens |
| CN108681032B (en) * | 2018-05-07 | 2023-10-20 | 南京波长光电科技股份有限公司 | Large-breadth long-wave infrared optical passive athermal fisheye lens |
| CN110955032A (en) * | 2020-01-03 | 2020-04-03 | 福建福光天瞳光学有限公司 | Large-target-surface high-resolution optical athermalization lens and working method thereof |
| CN110955032B (en) * | 2020-01-03 | 2023-07-21 | 福建福光天瞳光学有限公司 | Large-target-surface high-resolution optical athermalized lens and working method thereof |
| CN111505800A (en) * | 2020-04-22 | 2020-08-07 | 南京波长光电科技股份有限公司 | 200mm fixed-focus lens without diffraction surface for 1.5-5.0 um high-frame frequency refrigeration type medium wave infrared core |
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