CN113741009A - Thermal difference eliminating infrared lens with focal length of 25mm and assembling method thereof - Google Patents
Thermal difference eliminating infrared lens with focal length of 25mm and assembling method thereof Download PDFInfo
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- CN113741009A CN113741009A CN202111063459.2A CN202111063459A CN113741009A CN 113741009 A CN113741009 A CN 113741009A CN 202111063459 A CN202111063459 A CN 202111063459A CN 113741009 A CN113741009 A CN 113741009A
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- focal length
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- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 239000005387 chalcogenide glass Substances 0.000 claims abstract description 4
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000008030 elimination Effects 0.000 claims description 5
- 238000003379 elimination reaction Methods 0.000 claims description 5
- 125000006850 spacer group Chemical group 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 230000014509 gene expression Effects 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 238000003384 imaging method Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
Abstract
The invention provides a heat difference eliminating infrared lens and an assembling method thereof. The lens comprises a lens barrel, a first positive lens, a negative lens and a second positive lens, wherein the first positive lens, the negative lens and the second positive lens are sequentially arranged in the lens barrel from left to right along the light transmission direction; the distance between the first positive lens and the negative lens is 7.24mm, and the distance between the negative lens and the second positive lens is 7.23 mm; the first positive lens and the second positive lens are made of chalcogenide glass, and the negative lens is made of zinc selenide. The athermal infrared lens disclosed by the invention applies an optical passive compensation technology, so that the lens can keep the imaging consistency in a complex working environment. Through the matching of focal power, lens materials and the distance between the lenses, a good optical passive heat difference eliminating effect can be achieved by only adopting a three-piece lens structure, the optical passive heat difference eliminating device can be matched with a long-wave infrared uncooled 640x480 and 17 mu m detector to complete the tasks of live recording and monitoring, and has a good imaging effect in the temperature range of 8-12 micron wave band and-40-60 ℃.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and relates to an infrared lens capable of eliminating heat difference and an assembly method thereof.
Background
With the development of science and technology, infrared imaging technology has been widely applied in the fields of national defense, industry, medical treatment and the like. The infrared detection has certain capabilities of penetrating smoke, fog, haze, snow and the like and recognizing camouflage, is not interfered by battlefield strong light and flash light to cause blindness, can realize remote and all-weather observation, and is particularly suitable for target detection at night and under adverse weather conditions.
However, in the application of infrared imaging, the temperature of the external environment may affect the refractive index of the lens material, and may also cause thermal expansion and cold contraction to the lens barrel material, so that the focal power changes and the optimal image plane shifts, the image is blurred, the contrast ratio is reduced, the optical imaging quality is reduced, and the imaging performance of the lens is finally affected.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an infrared lens capable of eliminating heat difference and an assembly method thereof. The specific technical scheme is as follows.
A thermal difference elimination infrared lens with a focal length of 25mm comprises a lens barrel, a first positive lens, a negative lens and a second positive lens, wherein the first positive lens, the negative lens and the second positive lens are sequentially arranged in the lens barrel from left to right along a light transmission direction; the distance between the first positive lens and the negative lens is 7.24mm, and the distance between the negative lens and the second positive lens is 7.23 mm; the first positive lens and the second positive lens are made of chalcogenide glass, and the negative lens is made of zinc selenide.
Preferably, the center thickness of the first positive lens is 4.2mm, the center thickness of the negative lens is 2mm, and the center thickness of the second positive lens is 3.5 mm.
Preferably, the fitting curvature radius of the first positive lens on the light ray incidence side in the light ray transmission direction is 29.86mm, and the fitting curvature radius of the first positive lens on the light ray emergence side is 85.49 mm.
Preferably, the fitting curvature radius of the negative lens along the light transmission direction on the light incidence side is 24.03mm, and the fitting curvature radius of the negative lens along the light transmission direction on the light emergence side is 83.73 mm.
Preferably, the fitting curvature radius of the second positive lens along the light transmission direction on the light incidence side is 56.55mm, and the fitting curvature radius of the second positive lens along the light transmission direction on the light emergence side is 130 mm.
Preferably, the inner peripheral surface of the lens barrel is provided with a first pressing ring on the light incident side of the first positive lens, an O-ring is provided between the first positive lens and the inner peripheral surface of the lens barrel, a spacer is provided between the negative lens and the second positive lens, and a second pressing ring is provided on the light emitting side of the second positive lens on the inner peripheral surface of the lens barrel.
Preferably, the first pressing ring and the second pressing ring are made of aluminum.
Preferably, the O-shaped ring is made of silicon rubber.
Preferably, both sides of the first positive lens are aspheric surfaces, the light incidence side of the negative lens is an aspheric surface, the light incidence side of the second positive lens is an aspheric surface, and the four aspheric surfaces all satisfy the following expressions:
in the formula:
z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction;
c = 1/R; r is the paraxial curvature fitting radius of the mirror surface; k is a conic coefficient;
a, B, C, D and E are high-order aspheric coefficients.
An assembling method of an athermal infrared lens with a focal length of 25mm comprises the following steps:
(1) a second positive lens, a negative lens and a first positive lens are sequentially assembled from the front section of the lens barrel in the lens barrel;
(2) a first pressing ring is arranged on the inner circumferential surface of the lens barrel on the light incidence side of the first positive lens, the first positive lens is fixed through the first pressing ring, and the lens barrel and the first pressing ring are fixed through dispensing;
(3) and a second pressing ring is arranged on the inner circumferential surface of the lens barrel on the light emergent side of the second positive lens, the second positive lens is fixed through the second pressing ring, and the lens barrel and the second pressing ring are fixed through dispensing.
The athermal infrared lens with the focal length of 25mm, provided by the invention, applies an optical passive compensation technology, so that the lens can keep the imaging consistency in a complex working environment. Through the matching of focal power, lens materials and the distance between the lenses, a good optical passive heat difference eliminating effect can be achieved by only adopting a three-piece lens structure, and the imaging effect is good in a temperature range of 8-12 microns wave band and-40 ℃ to 60 ℃.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a diagram of a lens of a 25mm athermal infrared lens according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a 25mm athermal infrared lens in accordance with an embodiment of the present invention;
FIG. 3 is an MTF graph of a 25mm athermal infrared lens in a 20 ℃ operating environment in accordance with an embodiment of the present invention;
FIG. 4 is an MTF chart of a 25mm athermal infrared lens in a working environment at-40 ℃ in accordance with an embodiment of the present invention;
fig. 5 is an MTF graph of a 25mm athermal infrared lens in a 60 ℃ working environment in an embodiment of the present invention.
1. The lens comprises a first pressing ring, 2. an O-shaped ring, 3. a first positive lens, 4. a lens cone, 5. a negative lens, 6. a space ring, 7. a second positive lens, 8. a second pressing ring and 9. a lens rear cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 in the specification is a side sectional view of a 25mm thermal difference elimination infrared lens provided by the invention. As shown in the figure, the thermal difference elimination infrared lens comprises a lens barrel 4, and a first positive lens 3, a negative lens 5 and a second positive lens 7 are sequentially arranged in the lens barrel 4 along the light transmission direction.
The two sides of the first positive lens 3 are aspheric surfaces, the light incidence side of the negative lens 5 is an aspheric surface, the light incidence side of the second positive lens 7 is an aspheric surface, and the four aspheric surfaces all satisfy the following expressions:
in the formula:
z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction;
c = 1/R; r is the paraxial curvature fitting radius of the mirror surface; k is a conic coefficient;
a, B, C, D and E are high-order aspheric coefficients.
Specific parameters of each lens are shown in tables 1 to 4.
TABLE 1 lens parameters
TABLE 2 first Positive lens 3 aspheric coefficients A, B, C, D, E data
TABLE 3 negative lens 5 aspheric coefficients A, B, C, D, E data
TABLE 4 aspherical surface coefficients A, B, C, D, E of the second positive lens element 7
In this embodiment, the lens system adopts a three-piece positive-negative-positive structure, and the focal power of the system is adjusted to match, so that the resolution of the lens system can be effectively improved, and the local sensitivity of the system caused by too concentrated local focal power can be reduced. The lens material is matched with chalcogenide glass-zinc selenide-chalcogenide glass, and the lens material and focal power are matched to achieve the purpose of eliminating temperature as much as possible to change the position of the image plane of the optical system.
As shown in fig. 1 of the specification, the first pressing ring 1 is disposed on the inner circumferential surface of the first positive lens 3, the O-ring 2 is disposed between the first positive lens 3 and the inner circumferential surface of the lens barrel 4, the spacer 6 is disposed between the negative lens 5 and the second positive lens 7, and the second pressing ring 8 is disposed on the inner circumferential surface of the lens barrel 4. Therefore, in the lens system in the present example, the second positive lens 7 is positioned by the second pressing ring 8 at the rear end of the lens barrel, the negative lens 5 is limited by the spacer 6, and the first positive lens 3 is fixed and limited by the first spacer 1 and the O-ring 2, so that the relative positions of the three lenses and the lens barrel are kept unchanged.
When the lens barrel is installed, the second positive lens 7, the negative lens 5 and the first positive lens 3 are assembled from the front section of the lens barrel in sequence in the lens barrel 4; the first positive lens 3 is fixed through the first pressing ring 1 and the O-shaped ring, and is fixed at the threaded connection position between the lens cone 4 and the first pressing ring 1 through dispensing; the second positive lens 7 is fixed by the second pressing ring 8, and is fixed by dispensing at the threaded connection between the lens barrel 4 and the second pressing ring 8.
Preferably, the lens barrel 4 is made of aluminum, the first pressing ring 1 and the second pressing ring 8 are made of aluminum, and the O-ring 2 is made of silicon rubber.
In this embodiment, the MTF graphs of the 25mm athermal infrared lens in the working environment of 20 ℃, -40 ℃ and 60 ℃ are shown in FIGS. 3 to 5, respectively.
In summary, the thermal difference elimination infrared lens composed of the above lenses provided by the present embodiment achieves the following optical indexes.
The working wave band is as follows: 8-12 μm;
focal length: f' =25 mm;
a detector: long-wave infrared uncooled type 640 multiplied by 480, 17 μm;
f number: 1.2;
horizontal field angle: 24.55 °, vertical field angle: 18.54 degrees;
temperature range: -40 ℃ to 60 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The thermal difference eliminating infrared lens with the focal length of 25mm is characterized by comprising a lens barrel, a first positive lens, a negative lens and a second positive lens, wherein the first positive lens, the negative lens and the second positive lens are sequentially arranged in the lens barrel from left to right along the light transmission direction; the distance between the first positive lens and the negative lens is 7.24mm, and the distance between the negative lens and the second positive lens is 7.23 mm; the first positive lens and the second positive lens are made of chalcogenide glass, and the negative lens is made of zinc selenide.
2. The athermal infrared lens with a focal length of 25mm as claimed in claim 1, wherein said first positive lens has a center thickness of 4.2mm, said negative lens has a center thickness of 2mm, and said second positive lens has a center thickness of 3.5 mm.
3. The athermal infrared lens with a focal length of 25mm as claimed in claim 1, wherein the fitting curvature radius of the first positive lens along the light transmission direction on the light incidence side is 29.86mm, and the fitting curvature radius of the first positive lens along the light transmission direction on the light emergence side is 85.49 mm.
4. The athermal infrared lens having a focal length of 25mm as claimed in claim 1, wherein the negative lens has a fitting radius of curvature of 83.73mm on the light incident side and a fitting radius of curvature of 83.73mm on the light exiting side along the light transmission direction.
5. The athermal infrared lens with a focal length of 25mm as claimed in claim 1, wherein the fitting curvature radius of the second positive lens along the light transmission direction on the light incidence side is 56.55mm, and the fitting curvature radius of the second positive lens along the light transmission direction on the light emergence side is 130 mm.
6. The athermal infrared lens with a focal length of 25mm as claimed in any of claims 1 to 5, wherein a first pressing ring is provided on the inner peripheral surface of the lens barrel on the light incident side of the first positive lens, an O-ring is provided between the first positive lens and the inner peripheral surface of the lens barrel, a spacer is provided between the negative lens and the second positive lens, and a second pressing ring is provided on the inner peripheral surface of the lens barrel on the light emergent side of the second positive lens.
7. The athermal infrared lens with a focal length of 25mm as claimed in claim 6, wherein the first pressing ring and the second pressing ring are made of aluminum.
8. The thermal difference elimination infrared lens with the focal length of 25mm as claimed in claim 6, wherein the O-shaped ring is made of silicon rubber.
9. The infrared lens with the focal length of 25mm for eliminating the thermal difference as claimed in claim 1, wherein both sides of the first positive lens are aspheric surfaces, the light incident side of the negative lens is aspheric surface, the light incident side of the second positive lens is aspheric surface, and the four aspheric surfaces all satisfy the following expressions:
in the formula:
z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction;
c = 1/R; r is the paraxial curvature fitting radius of the mirror surface; k is a conic coefficient;
a, B, C, D and E are high-order aspheric coefficients.
10. A lens assembling method applied to a 25mm focal length athermal infrared lens according to any one of claims 1 to 9, comprising the steps of:
(1) a second positive lens, a negative lens and a first positive lens are sequentially assembled from the front section of the lens barrel in the lens barrel;
(2) a first pressing ring is arranged on the inner circumferential surface of the lens barrel on the light incidence side of the first positive lens, the first positive lens is fixed through the first pressing ring, and the lens barrel and the first pressing ring are fixed through dispensing;
(3) and a second pressing ring is arranged on the inner circumferential surface of the lens barrel on the light emergent side of the second positive lens, the second positive lens is fixed through the second pressing ring, and the lens barrel and the second pressing ring are fixed through dispensing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111063459.2A CN113741009A (en) | 2021-09-10 | 2021-09-10 | Thermal difference eliminating infrared lens with focal length of 25mm and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111063459.2A CN113741009A (en) | 2021-09-10 | 2021-09-10 | Thermal difference eliminating infrared lens with focal length of 25mm and assembling method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113741009A true CN113741009A (en) | 2021-12-03 |
Family
ID=78738091
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111063459.2A Withdrawn CN113741009A (en) | 2021-09-10 | 2021-09-10 | Thermal difference eliminating infrared lens with focal length of 25mm and assembling method thereof |
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| CN (1) | CN113741009A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236784A (en) * | 2021-12-14 | 2022-03-25 | 安徽光智科技有限公司 | Electric focusing infrared lens with focal length of 75mm |
| CN114935810A (en) * | 2022-05-06 | 2022-08-23 | 安徽光智科技有限公司 | Thermal difference eliminating infrared lens with focal length of 6.6mm |
-
2021
- 2021-09-10 CN CN202111063459.2A patent/CN113741009A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236784A (en) * | 2021-12-14 | 2022-03-25 | 安徽光智科技有限公司 | Electric focusing infrared lens with focal length of 75mm |
| CN114236784B (en) * | 2021-12-14 | 2023-02-28 | 安徽光智科技有限公司 | Electric focusing infrared lens with focal length of 75mm |
| CN114935810A (en) * | 2022-05-06 | 2022-08-23 | 安徽光智科技有限公司 | Thermal difference eliminating infrared lens with focal length of 6.6mm |
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Application publication date: 20211203 |