CN109521542B - Economical low-distortion long-wave infrared optical athermalization lens and assembly method thereof - Google Patents
Economical low-distortion long-wave infrared optical athermalization lens and assembly method thereof Download PDFInfo
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- CN109521542B CN109521542B CN201811617466.0A CN201811617466A CN109521542B CN 109521542 B CN109521542 B CN 109521542B CN 201811617466 A CN201811617466 A CN 201811617466A CN 109521542 B CN109521542 B CN 109521542B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 12
- 238000002834 transmittance Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims 1
- 125000006850 spacer group Chemical group 0.000 description 4
- 229920001800 Shellac Polymers 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 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 description 2
- 229940113147 shellac Drugs 0.000 description 2
- 235000013874 shellac Nutrition 0.000 description 2
- 239000004208 shellac Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 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
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 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
- 238000002310 reflectometry Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- 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
- 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
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
- Lens Barrels (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention relates to an economical low-distortion long-wave infrared optical athermalization lens and an assembly method thereof, wherein the athermalization lens comprises a main lens barrel, a positive lens A, a negative lens B and a positive lens C are sequentially arranged in the main lens barrel from front to back along the incidence direction of light, a front pressing ring is arranged on the front side of the positive lens A, a first spacing ring is arranged between the positive lens A and the negative lens B, a second spacing ring is arranged between the negative lens B and the positive lens C, and an annular flange which is abutted against the rear side edge of the positive lens C is arranged at the rear end of the main lens barrel. The economical low-distortion long-wave infrared optical athermalization lens has the advantages of short lens length, compact structure, portability, high transmittance and low distortion.
Description
Technical Field
The invention relates to an economical low-distortion long-wave infrared optical athermalization lens and an assembly method thereof.
Background
With the development of scientific technology, infrared imaging technology has been widely used in the fields of national defense, industry, medical treatment, etc. The infrared detection has certain capabilities of penetrating smoke, fog, haze, snow and the like and identifying camouflage, is not interfered by strong light and flash of a battlefield, can realize long-distance all-weather observation, and is particularly suitable for target detection at night and under bad weather conditions.
The temperature not only can influence the refractive index of the optical material, but also can cause thermal expansion and cold contraction to the lens barrel material, so that the focal power change and the optimal image plane are offset. The optical imaging quality is reduced, the image is blurred, the contrast is reduced, and the imaging performance of the lens is finally affected.
Disclosure of Invention
The invention aims to provide an economical low-distortion long-wave infrared optical athermalization lens and an assembly method thereof, wherein the lens is short in length, compact in structure, convenient to carry, high in transmittance and low in distortion.
The technical scheme of the invention is as follows: the utility model provides an economical low distortion long wave infrared optics athermalization camera lens, includes the main lens cone, positive lens A, negative lens B, positive lens C have been set gradually from the front to the back along light incident direction in the main lens cone, positive lens A front side is provided with preceding clamping ring, is equipped with first spacer ring between positive lens A and the negative lens B, is equipped with the second spacer ring between negative lens B and the positive lens C, the rear end of main lens cone is provided with the annular flange with positive lens C's rear side limit looks butt.
Further, the air space between the positive lens a and the negative lens B is 0.8mm, and the air space between the negative lens B and the positive lens C is 5.4mm.
Further, an annular groove which is subjected to sand blasting matte black treatment is formed in the rear end face of the main lens barrel.
Further, an internal thread is arranged in the front end of the main lens barrel, an external thread is arranged on the outer side wall of the rear part of the main lens barrel, and the front pressing ring is in threaded connection with the internal thread.
An assembly method applied to an economical low-distortion long-wave infrared optical athermalization lens comprises the following steps:
1) Sequentially assembling a positive lens C, a second space ring, a negative lens B, a first space ring and a positive lens A from the front end of the main lens barrel;
2) The front pressing ring is connected with the main lens barrel to fix all the components.
Compared with the prior art, the invention has the following advantages: the structure is compact, the structure length of the lens is short, the lens is convenient to carry, the transmittance is high, the distortion is low, and the lens can be matched with a long-wave infrared uncooled 384×288 17 μm detector to perform live recording and monitoring tasks. The manufacturing cost is low, and the method is suitable for large-scale production.
Drawings
FIG. 1 is a schematic view of a lens structure according to the present invention;
FIG. 2 is a diagram of an optical system of the present invention;
FIG. 3 is a schematic view of the main barrel antireflection surface of the present invention with the addition of annular grooves and sandblasting for matt black;
in the figure: the lens comprises a front pressing ring, a first spacing ring, a second spacing ring, a main lens barrel, an annular flange, an annular groove, an external thread, an internal thread and positive lenses A, B, negative lenses B and C, wherein the front pressing ring is 1-, the first spacing ring, the second spacing ring, the main lens barrel, the annular flange, the annular groove and the positive lenses C are 5-.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Referring to fig. 1 to 3
The utility model provides an economical low distortion long wave infrared optics athermalization camera lens, includes main lens cone 4, positive lens A, negative lens B, positive lens C have been set gradually from the front to the back along light incident direction in the main lens cone, positive lens A front side is provided with preceding clamping ring 1, is equipped with first spacer ring 2 between positive lens A and the negative lens B, is equipped with second spacer ring 3 between negative lens B and the positive lens C, the rear end of main lens cone is provided with annular flange 5 with positive lens C's rear side limit looks butt.
In this embodiment, the air space between the positive lens a and the negative lens B is 0.8mm, and the air space between the negative lens B and the positive lens C is 5.4mm.
In this embodiment, in order to reduce the reflectivity and improve the problem of whitening of the picture, an annular groove 6 subjected to sand blasting and matte black treatment is arranged on the rear end face of the main lens barrel, and the depth of the annular groove is 0.2mm.
In this embodiment, the front end of the main lens barrel is internally provided with an internal thread 8, and the front pressing ring is screwed with the internal thread, so that the main lens barrel is connected with the front pressing ring conveniently. The external thread 7 of M18 is arranged on the outer side wall of the rear part of the main lens barrel, so that the main lens barrel is convenient to use in an inter-fit manner with a camera interface, and the use requirement of a system is ensured.
In this embodiment, the optical structure formed by the lens group achieves the following optical indexes:
working wave band: 8 μm to 12 μm;
focal length: f' =12.8 mm;
the detector comprises: long wave infrared uncooled 384×288, 17 μm;
angle of view: 28.6 x 21.6;
relative pore diameter D/f': 1/1.
In this embodiment, specific parameters of each lens are as follows:
。
an assembly method applied to an economical low-distortion long-wave infrared optical athermalization lens comprises the following steps:
1) Sequentially assembling a positive lens C, a second space ring, a negative lens B, a first space ring and a positive lens A from the front end of the main lens barrel;
2) The front pressing ring is screwed with the main lens barrel to fix all the parts, and shellac is injected at the thread matching position.
The assembly is favorable for ensuring the air distance between the positive lens A and the negative lens B and between the negative lens B and the positive lens C, improving the assembly yield, and the screw thread matching position between the main lens barrel and the front pressing ring is injected with shellac.
The foregoing is only illustrative of the present invention, and it will be apparent to those skilled in the art from this disclosure that, based upon the teachings herein, an economical low-distortion long-wave infrared optical athermalization lens and its method of assembly can be devised without the need for inventive faculty, and equivalent changes, modifications, substitutions and alterations to the invention as described in the claims should be considered to fall within the scope of the invention.
Claims (3)
1. An economical low-distortion long-wave infrared optical athermalization lens comprises a main lens barrel and is characterized in that a positive lens A, a negative lens B and a positive lens C are sequentially arranged in the main lens barrel from front to back along the incidence direction of light;
the air interval between the positive lens A and the negative lens B is 0.8mm, and the air interval between the negative lens B and the positive lens C is 5.4mm;
the thickness of the positive lens A is 2.8mm, the material is HWS6, the object side surface is convex and the curvature radius is 11mm, the image side surface is concave and the curvature radius is 20mm;
the negative transmittance B has a thickness of 1.7mm, the material is HWS6, the object side surface is convex and has a curvature radius of 10mm, the image side surface is concave and has a curvature radius of 4mm;
the thickness of the positive lens C is 2mm, the material is germanium, the object side surface is convex and the curvature radius is 30mm, and the image side surface is convex and the curvature radius is 60mm;
the front side of the positive lens A is provided with a front pressing ring, a first spacing ring is arranged between the positive lens A and the negative lens B, a second spacing ring is arranged between the negative lens B and the positive lens C, the rear end of the main lens barrel is provided with an annular flange which is abutted against the rear side edge of the positive lens C, and the rear end face of the main lens barrel is provided with an annular groove which is subjected to sand blasting matte black treatment.
2. The economical low-distortion long-wave infrared optical athermalization lens according to claim 1, wherein an internal thread is arranged in the front end of the main lens barrel, an external thread is arranged on the outer side wall of the rear part of the main lens barrel, and the front pressing ring is in threaded connection with the internal thread.
3. An assembly method for an economical low-distortion long-wave infrared optical athermalization lens as defined in claim 1, comprising the steps of:
1) Sequentially assembling a positive lens C, a second space ring, a negative lens B, a first space ring and a positive lens A from the front end of the main lens barrel;
2) The front pressing ring is connected with the main lens barrel to fix all the components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811617466.0A CN109521542B (en) | 2018-12-28 | 2018-12-28 | Economical low-distortion long-wave infrared optical athermalization lens and assembly method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811617466.0A CN109521542B (en) | 2018-12-28 | 2018-12-28 | Economical low-distortion long-wave infrared optical athermalization lens and assembly method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109521542A CN109521542A (en) | 2019-03-26 |
| CN109521542B true CN109521542B (en) | 2023-11-14 |
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| CN201811617466.0A Active CN109521542B (en) | 2018-12-28 | 2018-12-28 | Economical low-distortion long-wave infrared optical athermalization lens and assembly method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111123486B (en) * | 2019-11-26 | 2022-03-29 | 天津津航技术物理研究所 | Medium wave infrared athermal optical lens suitable for wide temperature range |
| CN111999842A (en) * | 2020-08-30 | 2020-11-27 | 福建福光天瞳光学有限公司 | f35mm mechanical passive athermalization lens and assembling method thereof |
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| CN106443982A (en) * | 2016-12-16 | 2017-02-22 | 福建福光天瞳光学有限公司 | Standard optical athermalization lens and making method thereof |
| CN106443940A (en) * | 2016-12-16 | 2017-02-22 | 福建福光天瞳光学有限公司 | High-fog-penetrating-property dual-compensation type optical machinery mixed athermalization long-wave infrared vehicle-mounted lens and compensation method thereof |
| CN106443943A (en) * | 2016-12-16 | 2017-02-22 | 福建福光天瞳光学有限公司 | Super-distant-vision glare-interference-prevention long-wave infrared optical athermalized automotive lens |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101369047B (en) * | 2008-04-28 | 2010-12-08 | 深圳市大族激光科技股份有限公司 | Optical lens |
| US7946732B2 (en) * | 2009-01-19 | 2011-05-24 | Osram Sylvania Inc. | LED lamp assembly |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1557717A (en) * | 1975-09-17 | 1979-12-12 | Eastman Kodak Co | Bellows for a photographic camers |
| CN205561316U (en) * | 2016-01-27 | 2016-09-07 | 青岛电子学校（山东省青岛第三十二中学） | Sawtooth surface formula solar heat collection device |
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| CN109521542A (en) | 2019-03-26 |
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