CN112255763A - Compact infrared lens with F4.5mm structure and assembling method thereof - Google Patents
Compact infrared lens with F4.5mm structure and assembling method thereof Download PDFInfo
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- CN112255763A CN112255763A CN202011106706.8A CN202011106706A CN112255763A CN 112255763 A CN112255763 A CN 112255763A CN 202011106706 A CN202011106706 A CN 202011106706A CN 112255763 A CN112255763 A CN 112255763A
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- lens
- crescent
- biconvex
- main
- pressing ring
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003825 pressing Methods 0.000 claims description 27
- 229920001800 Shellac Polymers 0.000 claims description 5
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 claims description 5
- 229940113147 shellac Drugs 0.000 claims description 5
- 235000013874 shellac Nutrition 0.000 claims description 5
- 239000004208 shellac Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 18
- 238000013461 design Methods 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003384 imaging 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
- 238000012634 optical imaging Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- 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
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention relates to an infrared lens with a compact F4.5mm structure, which is characterized in that: the LED lens comprises a lens barrel, wherein a negative crescent lens A, a positive crescent lens B and a biconvex lens C are sequentially arranged in the lens barrel along the incident direction of light from left to right, the air interval between the negative crescent lens A and the positive crescent lens B is 14.61mm, the air interval between the positive crescent lens B and the biconvex lens C is 8.85mm, and the air interval between the biconvex lens C and an image plane is 8.21 mm. The optical focal power is reasonably distributed in the optical design, the optical athermalization characteristic of temperature self-adaption is realized, and the optical focal power can be adapted to a long-wave infrared uncooled 384X 288, 17 mu m detector to perform live recording and monitoring tasks. The manufacturing cost is low, and the method is suitable for large-scale production.
Description
Technical Field
The invention relates to an infrared lens with a compact F4.5mm structure 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.
The temperature not only affects the refractive index of the optical material, but also expands with heat and contracts with cold on the lens barrel material, so that the focal power changes and the optimal image plane shifts. The optical imaging quality is reduced, the image is blurred, the contrast is reduced, and the imaging performance of the lens is influenced finally. Since the refractive index temperature coefficient of the infrared optical material is large, severe changes in the operating temperature can have a serious influence on the infrared optical system. To adapt to a particular application, the lens is also required to have temperature adaptability and portability.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an infrared lens with a compact F4.5mm structure and an assembling method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides an infrared camera lens of F4.5mm compact structure, includes the lens cone, has set gradually negative crescent lens A, positive crescent lens B, biconvex lens C along light from left right incidence direction in the lens cone, and the air interval between negative crescent lens A and the positive crescent lens B is 14.61mm, and the air interval between positive crescent lens B and the biconvex lens C is 8.85mm, and the air interval between biconvex lens C and the image plane is 8.21 mm.
Preferably, the lens barrel includes an outer cover, and a main barrel and a main lens barrel sequentially disposed in the outer cover.
Preferably, the negative crescent lens A is arranged on the inner wall of the front end of the main lens barrel, the A piece of pressing ring is arranged on the front side of the negative crescent lens A, the positive crescent perspective B and the biconvex lens C are arranged on the inner wall of the rear end of the main lens barrel, the B piece of pressing ring is arranged on the rear side of the positive crescent perspective B, and the rear pressing ring is arranged on the rear side of the biconvex lens C.
An assembly method of an F4.5mm compact infrared lens comprises the following steps: the negative crescent lens A is arranged from the front end of the main lens cone and is fixed through an A-piece pressing ring, and the A-piece pressing ring and the negative crescent lens A are sealed by shellac; the positive crescent lens B, B pieces of pressing rings and the biconvex lens C are assembled from the rear end of the main lens barrel in sequence and fixed by B pieces of pressing rings.
Compared with the prior art, the invention has the following beneficial effects: the optical focal power is reasonably distributed in the optical design, the optical athermalization characteristic of temperature self-adaption is realized, and the optical focal power can be adapted to a long-wave infrared uncooled 384X 288, 17 mu m detector to perform live recording and monitoring tasks. The manufacturing cost is low, and the method is suitable for large-scale production.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of an optical system.
In the figure:
1-main cylinder, 2-outer cover, 3-first telescopic ring, 4-countersunk screw, 5-fixing piece, 6-second telescopic ring, 7-elastic gasket, 8-limiting pressing ring, 9-negative crescent lens A, 10-A pressing ring, 11-main lens cone, 12-positive crescent lens perspective B, 13-B pressing ring, 14-rear pressing ring and 15-biconvex lens C.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-2, an infrared lens with a compact f4.5mm structure comprises a lens barrel, wherein a negative crescent lens a, a positive crescent lens B and a biconvex lens C are sequentially arranged in the lens barrel along the left-right incident direction of light, the air interval between the negative crescent lens a and the positive crescent lens B is 14.61mm, the air interval between the positive crescent lens B and the biconvex lens C is 8.85mm, and the air interval between the biconvex lens C and an image plane is 8.21 mm.
In the embodiment of the invention, the lens barrel comprises an outer cover, and a main barrel and a main lens barrel which are sequentially arranged in the outer cover.
In the embodiment of the invention, the negative crescent lens A is arranged on the inner wall of the front end of the main lens barrel, the A piece of pressing ring is arranged on the front side of the negative crescent lens A, the positive crescent perspective B and the biconvex lens C are arranged on the inner wall of the rear end of the main lens barrel, the B piece of pressing ring is arranged on the rear side of the positive crescent perspective B, and the rear pressing ring is arranged on the rear side of the biconvex lens C.
In the embodiment of the invention, the negative crescent lens A is limited by the front end of the main lens barrel, and the A piece pressing ring and the negative crescent lens A are sealed by shellac, so that the negative crescent lens A has good sealing performance.
In the embodiment of the invention, on the premise of ensuring compact structure, a series of measures are taken to improve the vibration and impact resistance of the lens, and the structure of the front lens barrel and the rear lens barrel is adopted to ensure the use requirement of the system.
In the embodiment of the invention, the outer cover is rotated through the limit of the countersunk head screw, so that the lens can be manually focused in a specified movement range, and the method is simpler and more convenient.
In the embodiment of the invention, the main lens cone is in threaded fit with the main cylinder, a part which is composed of a first telescopic ring, a fixing part and a second telescopic ring and is convenient to rotate is arranged between the main lens cone and the main cylinder, and the main cylinder is in threaded fit with the outer cover.
In the embodiment of the invention, the optical athermalization utilizes the difference between the characteristics of the optical materials in the optical design, and the influence of temperature is eliminated through the combination of the characteristic materials. Ensure the image quality to be stable in a larger temperature range and realize the optics without thermalization.
An assembly method of an F4.5mm compact infrared lens comprises the following steps: sequentially assembling a second telescopic ring, a fixing piece and a first telescopic ring into a main lens cone, assembling the main lens cone into a main barrel, fixing the main lens cone by an elastic gasket limiting pressing ring, connecting an outer cover with the main barrel through threads, and assembling a countersunk screw; the negative crescent lens A is arranged from the front end of the main lens cone and is fixed through an A-piece pressing ring, and the A-piece pressing ring and the negative crescent lens A are sealed by shellac; the positive crescent lens B, B pieces of pressing rings and the biconvex lens C are assembled from the rear end of the main lens barrel in sequence and fixed by B pieces of pressing rings. The assembly is favorable for reducing the assembly difficulty, improving the assembly efficiency and facilitating the debugging of the lens. All the thread matching parts between the outer cover and the lens cone are injected with shellac, which is helpful to improve the vibration resistance and impact resistance of the optical lens part and improve the anti-seismic performance of the whole lens.
In this embodiment, the optical structure formed by the above lens assembly achieves the following optical indexes:
the working wave band is as follows: 8-12 μm;
focal length: f' =4.5 mm;
a detector: the long-wave infrared non-refrigeration type 384 is multiplied by 288, 17 mu m;
the field angle: 79.44 ° × 60.86 °;
relative pore diameter D/f': 1.0;
the specific parameters of each lens are as follows:
the invention is not limited to the above best mode, and other various forms of compact infrared lens with F4.5mm structure and assembling method thereof can be obtained by anyone based on the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (4)
1. The utility model provides a F4.5mm compact structure infrared lens which characterized in that: the LED lens comprises a lens barrel, wherein a negative crescent lens A, a positive crescent lens B and a biconvex lens C are sequentially arranged in the lens barrel along the incident direction of light from left to right, the air interval between the negative crescent lens A and the positive crescent lens B is 14.61mm, the air interval between the positive crescent lens B and the biconvex lens C is 8.85mm, and the air interval between the biconvex lens C and an image plane is 8.21 mm.
2. The f4.5mm compact infrared lens of claim 1, characterized in that: the lens cone comprises an outer cover, and a main cylinder and a main lens cone which are sequentially arranged in the outer cover.
3. The f4.5mm compact infrared lens of claim 2, characterized in that: the negative crescent lens A is installed on the inner wall of the front end of the main lens cone, the A piece pressing ring is arranged on the front side of the negative crescent lens A, the positive crescent perspective B and the biconvex lens C are installed on the inner wall of the rear end of the main lens cone, the B piece pressing ring is arranged on the rear side of the positive crescent perspective B, and the rear pressing ring is arranged on the rear side of the biconvex lens C.
4. A method of assembling a f4.5mm compact infrared lens as defined in any one of claims 1 to 3, comprising the steps of: the negative crescent lens A is arranged from the front end of the main lens cone and is fixed through an A-piece pressing ring, and the A-piece pressing ring and the negative crescent lens A are sealed by shellac; the positive crescent lens B, B pieces of pressing rings and the biconvex lens C are assembled from the rear end of the main lens barrel in sequence and fixed by B pieces of pressing rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106706.8A CN112255763A (en) | 2020-10-16 | 2020-10-16 | Compact infrared lens with F4.5mm structure and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106706.8A CN112255763A (en) | 2020-10-16 | 2020-10-16 | Compact infrared lens with F4.5mm structure and assembling method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112255763A true CN112255763A (en) | 2021-01-22 |
Family
ID=74243610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011106706.8A Pending CN112255763A (en) | 2020-10-16 | 2020-10-16 | Compact infrared lens with F4.5mm structure and assembling method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112255763A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115407474A (en) * | 2022-08-30 | 2022-11-29 | 福建福光股份有限公司 | Waterproof lens |
-
2020
- 2020-10-16 CN CN202011106706.8A patent/CN112255763A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115407474A (en) * | 2022-08-30 | 2022-11-29 | 福建福光股份有限公司 | Waterproof lens |
| CN115407474B (en) * | 2022-08-30 | 2024-05-31 | 福建福光股份有限公司 | Waterproof lens |
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