CN219285487U - Athermal optical system capable of being plated with hard carbon film - Google Patents
Athermal optical system capable of being plated with hard carbon film Download PDFInfo
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- CN219285487U CN219285487U CN202320684220.5U CN202320684220U CN219285487U CN 219285487 U CN219285487 U CN 219285487U CN 202320684220 U CN202320684220 U CN 202320684220U CN 219285487 U CN219285487 U CN 219285487U
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- hard carbon
- optical system
- carbon film
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- 230000003287 optical effect Effects 0.000 title claims abstract description 49
- 229910021385 hard carbon Inorganic materials 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 17
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 10
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 230000005499 meniscus Effects 0.000 claims description 6
- 230000004075 alteration Effects 0.000 abstract description 6
- 238000003384 imaging method Methods 0.000 abstract description 3
- 230000008030 elimination Effects 0.000 abstract description 2
- 238000003379 elimination reaction Methods 0.000 abstract description 2
- 239000004576 sand Substances 0.000 description 3
- 150000004770 chalcogenides Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model discloses a athermal optical system capable of being coated with a hard carbon film, which comprises the following components in sequence along the optical axis direction: the first lens is made of germanium material, and the surface of the first lens is provided with a hard carbon protective film; the second lens is made of IG6 material, and the front surface and the rear surface of the second lens are respectively an aspheric surface and an aspheric diffraction surface; the third lens is made of germanium, and the front surface and the rear surface of the third lens are aspheric; the detector image plane is used for presenting an optical image. The utility model simultaneously realizes elimination of aberration and thermal difference, realizes optical passive athermalization in a wide temperature range of-40 ℃ to 60 ℃, and has the advantages of large target surface, small F number, clear imaging without manual focusing at high and low temperatures, and the like.
Description
Technical Field
The utility model relates to the technical field of optical systems, in particular to a athermal optical system capable of being plated with a hard carbon film.
Background
The optical passive athermalization means that the temperature compensation can be realized by utilizing the thermal characteristic difference of different optical materials and through the cooperation of a plurality of optical materials with different characteristics and structural materials, thereby achieving the purposes of eliminating the thermal difference and eliminating the aberration. The optical passive athermalization optical system has the characteristics of simple and reliable structure, high assembly efficiency and the like, and is suitable for mass production. The infrared optical system is more easily affected by temperature change due to obvious change of refractive index along with temperature, and the infrared optical system has limited material types, so that athermalization of the system is more difficult.
In recent years, with the advent of a chalcogenide material, almost all of the first lens of an optical passive athermalized lens adopts the chalcogenide material, and the combination selection is easier to realize athermalization and aberration of an optical system. However, the hard carbon film cannot be plated on the head piece sulfur-based lens, so that the lens cannot meet the use requirements of severe environments such as sand wind and the like.
Disclosure of Invention
Accordingly, it is necessary to provide a hard carbon film-coatable athermal optical system in order to solve the above-mentioned problems.
An athermal optical system of a hard carbon film, comprising, distributed in order along an optical axis:
the first lens is made of germanium material, and the surface of the first lens is provided with a hard carbon protective film;
the second lens is made of IG6 material, and the front surface and the rear surface of the second lens are respectively an aspheric surface and an aspheric diffraction surface;
the third lens is made of germanium, and the front surface and the rear surface of the third lens are aspheric;
the detector image plane is used for presenting an optical image.
In one embodiment, the first lens is a spherical lens and the shape of the first lens is a meniscus.
In one embodiment, the second lens is meniscus shaped and the concave surfaces of the second lens and the first lens are on the same side.
In one embodiment, the second lens is sized to fit the first lens.
In one embodiment, the third lens has a W-shaped surface.
In one embodiment, the detector of the detector image plane is a 640×512@17 μm long wave uncooled infrared detector.
According to the athermal optical system capable of being plated with the hard carbon film, the first lens is made of the germanium material and is plated with the hard carbon protective film, so that the optical lens can be protected, and the optical system can simultaneously realize elimination of aberration and thermal difference by utilizing the combination of different materials of the first lens, the second lens and the third lens and the light diffraction effect of the aspheric diffraction surface of the second lens, and realize optical passive athermal in a wide temperature range of-40 ℃ to 60 ℃, and has the advantages of large target surface, small F number, clear imaging without manual focusing at high and low temperatures and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hard carbon film plateable athermal optical system of the present utility model;
FIG. 2 is a graph of MTF at about 30lp/mm for a hard carbon plateable infrared optical system of the present utility model at 22 ℃;
FIG. 3 is a graph of MTF at-40℃for a athermal infrared optical system of the plateable hard carbon film of the present utility model @30 lp/mm;
FIG. 4 is a graph of MTF at 60℃for a athermal infrared optical system of the plateable hard carbon film of the present utility model at @30 lp/mm;
FIG. 5 is a 22℃time chart of a hard carbon film plateable infrared optical system of the present utility model;
FIG. 6 is a timing chart of the athermal infrared optical system of the utility model at-40℃for a hard carbon film plateable;
FIG. 7 is a 60℃time chart of a hard carbon film plateable infrared optical system of the present utility model;
FIG. 8 is a graph of the aberration-reducing infrared optical system distortion of the plateable hard carbon film of the present utility model;
FIG. 9 is a graph of the relative illuminance of a athermal infrared optical system of the plateable hard carbon film of the present utility model.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
Referring to fig. 1 to 9, an embodiment of the present utility model provides an athermal optical system capable of being coated with a hard carbon film, which includes:
the first lens 1 is made of germanium, and a hard carbon protective film is arranged on the surface of the first lens 1; in this embodiment, the hard carbon protection film may be coated on the front surface of the first lens 1 to play a role in protecting dust, sand and salt mist, so that the lens can adapt to the use requirements of severe environments such as sand and wind.
A second lens 2, wherein the second lens 2 is made of an IG6 material, and a front surface and a rear surface of the second lens 2 are respectively an aspheric surface and an aspheric diffraction surface;
the third lens 3 is made of germanium, and the front surface and the rear surface of the third lens 3 are aspheric;
the detector image plane 4 is used for presenting an optical image.
According to the athermal optical system capable of being plated with the hard carbon film, the first lens 1 is made of germanium materials, and is plated with the hard carbon protective film, so that an optical lens can be protected, and the optical system can simultaneously eliminate aberration and thermal difference by utilizing the combination of different materials of the first lens 1, the second lens 2 and the third lens 3 and the light diffraction effect of the aspheric diffraction surface of the second lens 2, so that the athermal optical system has the advantages of large target surface, small F number, clear imaging without manual focusing at high and low temperatures and the like, and the athermal optical system is realized within a wide temperature range of-40 ℃ to 60 ℃. Optionally, the focal length of the present utility model is 60mm and the f number is 1.
In an embodiment of the present utility model, the first lens 1 is a spherical lens, and the shape of the first lens 1 is a meniscus shape. Thus, the hard carbon protective film is conveniently plated on the surface of the first lens 1, and the production cost can be greatly reduced.
In an embodiment of the present utility model, the shape of the second lens 2 is a meniscus shape, and the concave surfaces of the second lens 2 and the first lens 1 are located on the same side. Optionally, the size of the second lens 2 is adapted to the size of the first lens 1. Thus, the shapes, sizes and positions of the first lens 1 and the second lens 2 can be matched, the distance between the first lens and the second lens is reduced on the premise of meeting the light transmission requirement, and the overall length of the optical system is reduced.
In an embodiment of the present utility model, the surface shape of the third lens 3 is W-shaped. In this way, the light is focused on the front and rear surfaces of the aspheric surface of the W-shaped third lens 3, so that the off-axis aberration can be effectively corrected, and the sharpness of the final image can be improved.
In an embodiment of the present utility model, the detector of the detector image plane 4 may be a 640×512@17 μm long-wave uncooled infrared detector or the like. In other embodiments, other types of detectors may be suitable.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The examples described above represent only a few embodiments of the present utility model and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (6)
1. An athermal optical system capable of being coated with a hard carbon film, comprising:
the first lens is made of germanium material, and the surface of the first lens is provided with a hard carbon protective film;
the second lens is made of IG6 material, and the front surface and the rear surface of the second lens are respectively an aspheric surface and an aspheric diffraction surface;
the third lens is made of germanium, and the front surface and the rear surface of the third lens are aspheric;
the detector image plane is used for presenting an optical image.
2. The hard carbon film plateable athermal optical system of claim 1, wherein the first lens is a spherical lens and the shape of the first lens is a meniscus.
3. The hard carbon film plateable athermal optical system of claim 2, wherein the second lens is meniscus shaped and the concave surfaces of the second lens and the first lens are on the same side.
4. The hard carbon film plateable athermal optical system of claim 3, wherein a size of the second lens is adapted to a size of the first lens.
5. The hard carbon film-plateable athermal optical system of claim 1, wherein the surface shape of the third lens is W-shaped.
6. The hard carbon film plateable athermal optical system of claim 1 wherein the detector of the detector image plane is a 640 x 512@17 μm long wave uncooled infrared detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320684220.5U CN219285487U (en) | 2023-03-31 | 2023-03-31 | Athermal optical system capable of being plated with hard carbon film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320684220.5U CN219285487U (en) | 2023-03-31 | 2023-03-31 | Athermal optical system capable of being plated with hard carbon film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219285487U true CN219285487U (en) | 2023-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320684220.5U Active CN219285487U (en) | 2023-03-31 | 2023-03-31 | Athermal optical system capable of being plated with hard carbon film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219285487U (en) |
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2023
- 2023-03-31 CN CN202320684220.5U patent/CN219285487U/en active Active
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