CN212379631U - Infrared camera lens with compact structure - Google Patents
Infrared camera lens with compact structure Download PDFInfo
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- CN212379631U CN212379631U CN202021100187.XU CN202021100187U CN212379631U CN 212379631 U CN212379631 U CN 212379631U CN 202021100187 U CN202021100187 U CN 202021100187U CN 212379631 U CN212379631 U CN 212379631U
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- lens
- orthodontic
- mirror surface
- biconvex
- infrared
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- 230000003287 optical effect Effects 0.000 claims abstract description 24
- 238000003825 pressing Methods 0.000 claims description 14
- 150000004770 chalcogenides Chemical class 0.000 claims description 6
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000002834 transmittance Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 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
- 238000005057 refrigeration Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to an infrared lens with compact structure, the optical system of the lens comprises an orthodontic lens A, an orthodontic lens B and a biconvex lens C which are arranged along the incident light path from front to back in sequence; the front mirror surface of the orthodontic lens A and the rear mirror surface of the biconvex lens C are spherical surfaces, and the rear mirror surface of the orthodontic lens A, the front mirror surface and the rear mirror surface of the orthodontic lens B and the front mirror surface of the biconvex lens C are all aspheric surfaces; the air space between the orthodontic lens a and the orthodontic lens B was 1.62mm, and the air space between the orthodontic lens B and the biconvex lens C was 3.23 mm. The infrared lens with the compact structure has the advantages of compact structure, short lens structure length, convenience in installation and high transmittance, in the optical design, the focal power is reasonably distributed, the optical athermalization characteristic of temperature self-adaption is realized, and the infrared lens can be adapted to a long-wave infrared uncooled 400 multiplied by 300 and 12 mu m detector to carry out live recording and monitoring tasks.
Description
Technical Field
The utility model relates to a compact structure type infrared camera lens.
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. In order to adapt to a particular application, the lens is also required to have a short mechanical length, easy installation and adjustment, and temperature adaptation.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides an infrared lens with compact structure, short overall length, easy installation and adaptive temperature.
The utility model discloses a following scheme realizes: an optical system of the infrared lens comprises an orthodontic lens A, an orthodontic lens B and a biconvex lens C which are sequentially arranged from front to back along an incident light path; the front mirror surface of the orthodontic lens A and the rear mirror surface of the biconvex lens C are spherical surfaces, and the rear mirror surface of the orthodontic lens A, the front mirror surface and the rear mirror surface of the orthodontic lens B and the front mirror surface of the biconvex lens C are all aspheric surfaces; the air space between the orthodontic lens a and the orthodontic lens B was 1.62mm, and the air space between the orthodontic lens B and the biconvex lens C was 3.23 mm.
Further, the curvature radius of the front mirror surface of the orthodontic lens A is 29.74 mm; the curvature radius of the rear mirror surface of the biconvex lens C is-827.69 mm; the orthodontic lens A is made of germanium and has a center thickness of 1.6mm, the orthodontic lens B is made of chalcogenide and has a center thickness of 6.7mm, and the biconvex lens C is made of chalcogenide and has a center thickness of 5.66 mm.
Further, the mechanical structure of camera lens includes the lens cone, lens cone hole rear end is provided with the annular step that pushes up biconvex lens C rear mirror surface outer fringe portion, is equipped with the AB space ring between anodal crescent lens A and the anodal crescent lens B, is equipped with the BC space ring between anodal crescent lens B and the biconvex lens C, and lens cone hole front end threaded connection is pressing the A piece clamping ring at anodal crescent lens A front mirror surface outer fringe portion, the A piece clamping ring is the ladder groove structure with anodal crescent lens A contact position.
Furthermore, the outer periphery of the rear end of the lens barrel is provided with an external thread connecting part, the length of the lens barrel is not more than 22mm, the front end of an inner hole of the lens barrel is provided with an internal thread, and the outer side of the A-piece pressing ring is provided with an external thread matched with the internal thread.
Compared with the prior art, the utility model discloses following beneficial effect has: the infrared lens with the compact structure has the advantages of compact structure, short lens structure length, convenience in installation and high transmittance, in the optical design, the focal power is reasonably distributed, the optical athermalization characteristic of temperature self-adaption is realized, the infrared lens can be adapted to a long-wave infrared uncooled 400X 300 and 12 mu m detector to carry out live recording and monitoring tasks, the manufacturing cost is low, and the infrared lens is suitable for large-scale production.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and related drawings.
Drawings
Fig. 1 is a schematic view of an overall structure of a lens according to an embodiment of the present invention;
FIG. 2 is a schematic view of the stepped groove structure on the pressing ring A of the embodiment of the present invention;
fig. 3 is a schematic view of an optical system of a lens barrel according to an embodiment of the present invention;
the reference numbers in the figures illustrate: the optical lens comprises 1-A piece pressing rings, 2-AB space rings, 3-BC space rings, 4-lens cones, 5-biconvex lenses C, 6-orthodontic lenses B, 7-orthodontic lenses A, 8-image surfaces and 9-step grooves.
Detailed Description
As shown in fig. 1 to 3, an infrared lens with a compact structure, an optical system of the lens includes an orthodontic lens a7, an orthodontic lens B6 and a biconvex lens C5 sequentially arranged from front to back along an incident light path; the front mirror surface of the orthodontic lens a and the rear mirror surface of the biconvex lens C are spherical surfaces, and the rear mirror surface (S2) of the orthodontic lens a, the front and rear mirror surfaces (S3, S4) of the orthodontic lens B, and the front mirror surface (S5) of the biconvex lens C are aspheric surfaces; the air space between the orthodontic lens a and the orthodontic lens B was 1.62mm, and the air space between the orthodontic lens B and the biconvex lens C was 3.23 mm. The infrared lens with the compact structure has the advantages of compact structure, short lens structure length, convenience in installation and high transmittance, in optical design, the focal power is reasonably distributed, the optical athermalization characteristic of temperature self-adaption is realized, the infrared lens can be adapted to a long-wave infrared uncooled 400X 300 and 12 mu m detector to carry out live recording and monitoring tasks, most of the infrared lens adopts aspheric surfaces, the manufacturing cost is low, and the infrared lens is suitable for large-scale production.
In the embodiment, the curvature radius of the front mirror surface (S1) of the positive crescent lens A is 29.74 mm; the radius of curvature of the rear mirror surface (S6) of the biconvex lens C is-827.69 mm; the orthodontic lens A is made of germanium and has a center thickness of 1.6mm, the orthodontic lens B is made of chalcogenide and has a center thickness of 6.7mm, and the biconvex lens C is made of chalcogenide and has a center thickness of 5.66 mm.
In this embodiment, the aspheric surfaces S2, S3, S4 and S5 satisfy the following formulas:
wherein, Z is the distance from the vertex of the aspheric surface to the height r when the aspheric surface reaches the position with the height r along the optical axis direction;
c =1/r, r represents the paraxial radius of curvature of the mirror surface, and k is the conic coefficient;
A2、A4、A6、A8、A10、A12expressed as high-order aspheric coefficients.
The table of high order aspheric coefficients is shown in the following table:
in the optical design, the optical passive athermalization utilizes the difference between the characteristics of optical materials, eliminates the influence of temperature through the combination of materials with different characteristics, ensures the image quality to be stable in a larger temperature range, and realizes the optical athermalization.
The optical system formed by the lens group achieves the following optical indexes:
the working wave band is as follows: 8-12 μm;
focal length: f' =14 mm;
a detector: long-wave infrared non-refrigeration 400 is multiplied by 300, 12 μm;
the field angle: 19.4 ° × 14.6 °.
In this embodiment, the mechanical structure of the lens includes a lens cone 4, the rear end of the inner hole of the lens cone 4 is provided with an annular step which props against the outer edge of the rear mirror surface of a biconvex lens C, an AB space ring 2 is arranged between an orthodontic lens a and an orthodontic lens B, a BC space ring 3 is arranged between the orthodontic lens B and the biconvex lens C, the front end of the inner hole of the lens cone is in threaded connection with an a-piece pressure ring 1 which presses the outer edge of the front mirror surface of the orthodontic lens a, the contact part of the a-piece pressure ring and the orthodontic lens a is in a stepped groove structure, and meanwhile, the a-piece pressure ring and the orthodontic lens a are sealed by silica gel, so that the mechanical structure has good sealing performance and realizes the waterproof function of the; the biconvex lens C is limited by an annular step at the rear end of the lens cone, the positive crescent lens B is positioned by a BC space ring, the positive crescent lens A is positioned by an AB space ring, and the three lenses are locked and positioned by an A pressing ring at the front end of the lens, so that the relative positions of the three positive lenses and the lens cone are kept unchanged, the accurate realization of an optical structure is ensured, the two space rings are adopted to separate the three positive lenses and the pressing ring for spiral positioning, and the whole length of the lens is shortened to the utmost extent on the premise of realizing an optical system; the matching part of the A-piece pressing ring and the front crescent lens A adopts a stepped structure, the screw thread screwing length between the A-piece pressing ring and the lens cone is lengthened, the mechanical strength and the screw thread connection strength of the A-piece pressing ring are improved, the positioning reliability of the three front lenses is realized, the use requirement of the system is ensured, the assembly is favorable for reducing the assembly difficulty, the assembly efficiency is improved, and the debugging of the lens is convenient.
In the embodiment, the outer periphery of the rear end of the lens barrel is provided with an external thread connecting part, so that the lens barrel is convenient to mount and adjust during use; lens cone length is no longer than 22mm, and the whole mechanical length of camera lens is shorter, and lens cone hole front end is provided with the internal thread, and the A piece clamping ring outside is provided with the external screw thread with internal thread fit.
The assembly process of the infrared lens with the compact structure comprises the following steps: the biconvex lens C, BC space ring, the orthodontic lens B, AB space ring and the orthodontic lens A are sequentially arranged from the front end of the lens barrel and are compressed and fixed through an A-piece pressing ring, and the A-piece pressing ring and the orthodontic lens A are sealed by silica gel.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (4)
1. The utility model provides an infrared camera lens of compact structure which characterized in that: the optical system of the lens comprises an orthodontic lens A, an orthodontic lens B and a biconvex lens C which are sequentially arranged from front to back along an incident light path; the front mirror surface of the orthodontic lens A and the rear mirror surface of the biconvex lens C are spherical surfaces, and the rear mirror surface of the orthodontic lens A, the front mirror surface and the rear mirror surface of the orthodontic lens B and the front mirror surface of the biconvex lens C are all aspheric surfaces; the air space between the orthodontic lens a and the orthodontic lens B was 1.62mm, and the air space between the orthodontic lens B and the biconvex lens C was 3.23 mm.
2. The compact infrared lens of claim 1, wherein: the curvature radius of the front mirror surface of the positive crescent lens A is 29.74 mm; the curvature radius of the rear mirror surface of the biconvex lens C is-827.69 mm; the orthodontic lens A is made of germanium and has a center thickness of 1.6mm, the orthodontic lens B is made of chalcogenide and has a center thickness of 6.7mm, and the biconvex lens C is made of chalcogenide and has a center thickness of 5.66 mm.
3. The compact infrared lens of claim 1, wherein: the mechanical structure of the lens comprises a lens barrel, wherein an annular step which is propped against the outer edge part of the rear mirror surface of the biconvex lens C is arranged at the rear end of an inner hole of the lens barrel, an AB space ring is arranged between the front crescent lens A and the front crescent lens B, a BC space ring is arranged between the front crescent lens B and the biconvex lens C, an A piece pressing ring which is pressed on the outer edge part of the front mirror surface of the front crescent lens A is in threaded connection with the front end of the inner hole of the lens barrel, and the contact part of the A piece pressing ring and the front crescent lens A is of a stepped.
4. The compact infrared lens of claim 3, wherein: the outer periphery of the rear end of the lens barrel is provided with an external thread connecting part, the length of the lens barrel is not more than 22mm, the front end of an inner hole of the lens barrel is provided with an internal thread, and the outer side of the A sheet pressing ring is provided with an external thread matched with the internal thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021100187.XU CN212379631U (en) | 2020-06-15 | 2020-06-15 | Infrared camera lens with compact structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021100187.XU CN212379631U (en) | 2020-06-15 | 2020-06-15 | Infrared camera lens with compact structure |
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| CN212379631U true CN212379631U (en) | 2021-01-19 |
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| CN202021100187.XU Active CN212379631U (en) | 2020-06-15 | 2020-06-15 | Infrared camera lens with compact structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI795327B (en) * | 2022-07-18 | 2023-03-01 | 新鉅科技股份有限公司 | Lens module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI795327B (en) * | 2022-07-18 | 2023-03-01 | 新鉅科技股份有限公司 | Lens module |
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