CN114236785A - Knob type infrared focusing lens with focal length of 54mm and assembling method thereof - Google Patents
Knob type infrared focusing lens with focal length of 54mm and assembling method thereof Download PDFInfo
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- CN114236785A CN114236785A CN202111524503.5A CN202111524503A CN114236785A CN 114236785 A CN114236785 A CN 114236785A CN 202111524503 A CN202111524503 A CN 202111524503A CN 114236785 A CN114236785 A CN 114236785A
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000005499 meniscus Effects 0.000 claims abstract description 88
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 8
- 229910052732 germanium Inorganic materials 0.000 claims description 5
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 230000014509 gene expression Effects 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 12
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- 230000008859 change Effects 0.000 abstract description 4
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- 238000012937 correction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- 239000000779 smoke Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- 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
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- 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
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
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Abstract
The invention discloses a knob type infrared focusing lens with a focal length of 54mm and an assembling method thereof. The lens comprises a main lens barrel, a first meniscus lens and a second meniscus lens, wherein the first meniscus lens and the second meniscus lens are arranged in the main lens barrel in sequence from an object side to an image side along an optical axis; the convex surface of the first meniscus lens faces the object side, and the convex surface of the second meniscus lens faces the image side; the focal power of the first meniscus lens and the focal power of the second meniscus lens are both positive; the working waveband of the infrared focusing lens is 8-12 mu m. The invention corrects and balances the aberration in the wide spectral range of 8-12 μm, so that the lens has excellent image quality in the wide spectral range, and the wide spectrum confocal is realized; by reasonable matching of focal power and aspheric surface design, a knob focusing mode is adopted, high resolution, high pass rate and low distortion can be obtained by only using two lenses, and air change among the lenses at different temperatures is completed to adjust the imaging performance of the optical system; the invention is suitable for a long-wave infrared detector with a 1280X1024 pixel.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and relates to a knob type infrared focusing lens with a focal length of 54mm and an assembling 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. The long-wave infrared lens in the market is suitable for a 320X 256-pixel or 640X 512-pixel area array, has the characteristics of small field of view and low imaging resolution, and needs to be matched with a higher-quality optical system for a long-wave infrared detector with a 1280X1024 pixel.
In order to eliminate or reduce the influence of temperature change on the imaging of the optical system, the optical system is kept stable in a larger temperature difference range, and good imaging quality is ensured, a corresponding compensation technology can be adopted. In the existing optical passive technology, more than three lenses are used, or a diffraction surface is introduced, so that the transmittance of an optical system is obviously reduced. The mechanical active focusing mode is usually complex in structure.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a knob type infrared focusing lens, which solves the problems that the refractive index of an optical material is influenced due to temperature, the focal power is changed and the optimal image plane is deviated due to the expansion caused by heat and contraction caused by cold of the shape of a lens barrel material, has a high-quality imaging effect at the temperature of minus 40 ℃ to 60 ℃, is suitable for a 1280X1024 infrared detector, and has the advantages of small number of lenses, simple structure, convenience in installation and simplicity and convenience in focusing. The specific technical scheme is as follows.
Providing a knob type infrared focusing lens with a focal length of 54mm, which comprises a main lens barrel, a first meniscus lens and a second meniscus lens, wherein the first meniscus lens and the second meniscus lens are arranged in the main lens barrel from an object side to an image side along an optical axis in sequence; the convex surface of the first meniscus lens faces the object side, and the convex surface of the second meniscus lens faces the image side; the focal power of the first meniscus lens and the focal power of the second meniscus lens are both positive; the working waveband of the lens is 8-12 mu m.
Preferably, an air space between the first meniscus lens and the second meniscus lens is 45.19 mm.
Preferably, the first meniscus lens has a center thickness of 4.2mm, an object side fitting radius of curvature of 46.47mm, and an image side fitting radius of curvature of 56.51 mm.
Preferably, the second meniscus lens has a center thickness of 2.5mm, an object side fitting radius of curvature of 23.83mm, and an image side fitting radius of curvature of 23.65 mm.
Preferably, the image side S2 surface of the first meniscus lens is aspheric, the image side S4 surface of the second meniscus lens is aspheric, and the following expression is satisfied:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position of the height 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.
Preferably, the first meniscus lens and the second meniscus lens are made of germanium. The scheme fully utilizes the advantages of high infrared refractive index, wide infrared transmission band range, small absorption coefficient, low dispersion rate, easy processing, flashing, corrosion and the like of the germanium material.
Preferably, a first pressing ring is arranged on the inner circumferential surface of the main lens barrel on the object side of the first meniscus lens, and a first O-ring is arranged between the first meniscus lens and the main lens barrel; an annular step attached to the image side of the first meniscus lens is arranged on the inner circumferential surface of the main lens barrel on the image side of the first meniscus lens; and a second pressing ring for fixing the second meniscus lens is arranged on the image side of the second meniscus lens.
Preferably, the first O-shaped ring is made of silicon rubber, and the first pressing ring and the second pressing ring are made of aluminum alloy.
Preferably, a movable lens barrel is arranged in the main lens barrel; the movable lens cone is connected with the main lens cone in an axial sliding manner, and penetrates through the main lens cone through a pin to be connected with a focusing knob; the focusing knob is of an eccentric structure and is connected with an external knob for driving the focusing knob to rotate; the main lens cone is provided with a guide groove for guiding the pin to move; the second meniscus lens is connected with the movable lens cone and moves along with the movement of the movable lens cone. In this scheme, outside knob drives the focusing knob and rotates to drive the pin and remove along the guide way, and then drive and remove the lens cone and remove, so realize the distance adjustment of second meniscus lens and detector imaging surface, accomplish the focusing purpose.
The invention also aims to provide a lens assembling method, which applies the knob type infrared focusing lens with the focal length of 54 mm. The method comprises the following steps: the first meniscus lens is arranged in the front part of the inner cavity of the main lens cone and is fixed with the first O-shaped ring by arranging a first pressing ring; the movable lens cone is arranged in the rear part of the inner cavity of the main lens cone, and the movable lens cone, the main lens cone and the focusing knob are connected together through a pin; and the second meniscus lens is arranged in the inner cavity of the movable lens cone and is fixed by arranging a second pressing ring.
Compared with the prior art, the invention has the beneficial effects that:
the knob type infrared focusing lens with the focal length of 54mm provided by the invention is used for carrying out aberration correction and balance on a wide spectral range from 8 micrometers to 12 micrometers, so that the lens has excellent image quality in the wide spectral range, and wide-spectrum confocal is realized. Through reasonable matching of focal power, aspheric surface design and a knob focusing mode, the high resolution, high pass rate and low distortion of the lens can be realized by only adopting two lenses, and the imaging performance of the optical system is adjusted through air change between the lenses at different temperatures. The invention is suitable for a 1280X1024, 12 μm long-wave infrared detector.
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 illustrating a lens assembly of a 54mm knob-type infrared focusing lens according to an embodiment of the present invention;
FIG. 2 is a perspective cross-sectional view of a 54mm knob-type infrared focusing lens according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a 54mm knob-type IR focusing lens according to an embodiment of the present invention;
FIG. 4 is a left side view of a 54mm knob type infrared focusing lens according to an embodiment of the present invention;
fig. 5 is a schematic view of an internal knob structure of a 54mm knob-type infrared focusing lens according to an embodiment of the present invention.
1. The lens barrel comprises a main lens barrel, 2, a first pressing ring, 3, a first O-shaped ring, 4, a first meniscus lens, 5, a movable lens barrel, 6, an external knob, 7, a second O-shaped ring, 8, a pin, 9, a set screw, 10, an internal knob, 11, a second pressing ring, 12, a second meniscus lens, 13, a second pressing ring, 14, a protection germanium window and 15, a FPA.
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.
As shown in fig. 1 to 4, a 54mm knob-type infrared focusing lens includes a main barrel 1, a first meniscus lens 4 and a second meniscus lens 12 disposed in the main barrel 1 in order from an object side to an image side along an optical axis; the convex surface of the first meniscus lens 4 faces the object side, and the convex surface of the second meniscus lens 12 faces the image side; the focal power of the first meniscus lens 4 and the focal power of the second meniscus lens 4 are both positive.
Wherein, a movable lens cone 5 is arranged in the main lens cone 1; the movable lens barrel 5 is connected with the main lens barrel 1 in an axial sliding mode, and a focusing knob 10 penetrates through the main lens barrel 1 through a pin 8. An external knob 6 for driving the focus knob 10 to rotate is connected to the focus knob 10. The external knob 6 is connected to the focus knob 10 by means of a set screw 9. The lower end of the external knob 6 is provided with a second O-shaped ring 7 for sealing, dust prevention and water prevention. The main barrel 1 is provided with a guide groove for guiding the movement of the pin 8. The second meniscus lens 12 is connected to the moving barrel 5 and can move with the movement of the moving barrel 5.
The object side of a first meniscus lens 4, the inner peripheral surface of a main lens cone 1 is provided with a first pressing ring 2, and a first O-shaped ring 3 is arranged between the first meniscus lens 4 and the main lens cone 1; an annular step attached to the image side of the first meniscus lens 4 is arranged on the inner circumferential surface of the main lens barrel 1 on the image side of the first meniscus lens 4; a second pressure ring 13 for fixing the second meniscus lens 12 is provided on the image side of the second meniscus lens 12. The first O-shaped ring 3 is made of silicon rubber, and the first pressing ring 2 and the second pressing ring 13 are made of aluminum alloy.
In the embodiment, the first meniscus lens 4 is positioned by the first pressing ring 2, the first O-ring 3 and the annular step inside the main lens barrel 1; the second meniscus lens 12 is restrained by the cooperation of the second pressing ring 13 and the annular step inside the moving barrel 5.
As shown in FIG. 5, the focus knob 10 has an eccentric structure, and the upper end of the pin is limited in the eccentric structure. When the focusing knob 10 is rotated, the eccentric spiral line drives the pin 10 to move. When focusing is carried out, the focusing knob 10 is driven to rotate by rotating the external knob 6, so that the pin 10 is driven to horizontally move along the guide groove of the main lens cone 1, and then the movable lens cone 5 is driven to horizontally move, and therefore the distance between the second meniscus lens 13 and the detector imaging surface FPA15 is adjusted, and the focusing purpose is completed.
When the lens is assembled, the first meniscus lens 4 is arranged in the front part of the inner cavity of the main lens cone 1 and is fixed with the first O-shaped ring 3 through the first pressing ring 2. The movable lens cone 5 is arranged in the rear part of the inner cavity of the main lens cone 1, and the movable lens cone 5 is connected with the main lens cone 1 and the focusing knob 10 through a pin 10; wherein, the lower end of the pin 10 can be connected with the movable lens cone 5 through screw threads, and the loose glue is coated at the screw thread connection part. The second meniscus lens 12 is loaded into the moving barrel 5 and fixed by providing the second pressing ring 11.
The structural design of this embodiment has guaranteed the steady of camera lens focusing process, axiality and precision.
As a specific embodiment, the air space between the first meniscus lens 4 and the second meniscus lens 12 is 45.19 mm. The distance between the second meniscus lens 12 and the protective germanium window 14 is 10.25 mm.
The first meniscus lens 4 has a center thickness of 4.2mm, an object side fitting radius of curvature of 46.47mm, and an image side fitting radius of curvature of 56.51 mm. The second meniscus lens 12 has a center thickness of 2.5mm, an object side fitting radius of curvature of 23.83mm, and an image side fitting radius of curvature of 23.65 mm.
Specifically, each lens parameter is as shown in tables 1 to 3.
TABLE 1 lens parameters
Table 2 aspherical surface coefficient data of the first meniscus lens S2 surface
Table 3 aspherical coefficient data of the S4 surface of the second meniscus lens
As shown in tables 2 and 3, the image side surface S2 of the first meniscus lens is aspheric, and the image side surface S4 of the second meniscus lens is aspheric. And satisfies 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 of the height 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.
The aspheric lens designed by the embodiment has better curvature radius characteristics, and has the advantages of improving the distortion aberration and improving the astigmatic aberration. After the aspherical lens is adopted in the embodiment, the aberration generated during imaging can be eliminated as much as possible, so that the imaging quality is improved.
The knob type infrared focusing lens composed of the above lenses provided by the embodiment achieves the following optical indexes.
The working wave band is as follows: 8-12 μm;
focal length: f' =54 mm;
resolution ratio: 1280x 102412 μm;
f number: 1;
horizontal field angle: 8.14 °, vertical field angle: 6.51 degrees;
distortion: less than 1%.
Temperature range: -40 ℃ to 60 ℃.
In the embodiment, the invention performs aberration correction and balance on a wide spectral range from 8 micrometers to 12 micrometers, so that the lens has excellent image quality in the wide spectral range, and wide-spectrum confocal is realized; by reasonable matching of focal power and aspheric surface design, a knob focusing mode is adopted, high resolution, high pass rate and low distortion can be obtained by only using two lenses, and air change among the lenses at different temperatures is completed to adjust the imaging performance of the optical system; the invention is suitable for a long-wave infrared detector with a 1280X1024 pixel.
It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection of the claims of the present invention.
Claims (10)
1. A knob type infrared focusing lens with a focal length of 54mm is characterized by comprising a main lens barrel, a first meniscus lens and a second meniscus lens, wherein the first meniscus lens and the second meniscus lens are arranged in the main lens barrel in sequence from an object side to an image side along an optical axis; the convex surface of the first meniscus lens faces the object side, and the convex surface of the second meniscus lens faces the image side; the focal power of the first meniscus lens and the focal power of the second meniscus lens are both positive; the working waveband of the lens is 8-12 mu m.
2. The knob type infrared focusing lens with the focal length of 54mm as claimed in claim 1, wherein the air space between the first meniscus lens and the second meniscus lens is 45.19 mm.
3. The knob type infrared focusing lens with the focal length of 54mm as claimed in claim 2, wherein the first meniscus lens has a center thickness of 4.2mm, an object side fitting curvature radius of 46.47mm and an image side fitting curvature radius of 56.51 mm.
4. The knob type infrared focusing lens with the focal length of 54mm as claimed in claim 3, wherein the second meniscus lens has a center thickness of 2.5mm, an object side fitting curvature radius of 23.83mm, and an image side fitting curvature radius of 23.65 mm.
5. The knob type infrared focusing lens with the focal length of 54mm as claimed in claim 1, wherein the image side surface of the first meniscus lens is aspheric, and the image side surface of the second meniscus lens is aspheric, and satisfies the following expressions:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position of the height 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.
6. The knob type infrared focusing lens with the focal length of 54mm as claimed in claim 1, wherein the first meniscus lens and the second meniscus lens are made of germanium.
7. The knob type infrared focusing lens with the focal length of 54mm according to claim 1, wherein a first pressing ring is arranged on the inner peripheral surface of the main lens barrel at the object side of the first meniscus lens, and a first O-ring is arranged between the first meniscus lens and the main lens barrel; an annular step attached to the image side surface of the first meniscus lens is arranged on the inner circumferential surface of the main lens barrel on the image side of the first meniscus lens; and a second pressing ring for fixing the second meniscus lens is arranged on the image side of the second meniscus lens.
8. The knob type infrared focusing lens with the focal length of 54mm as claimed in claim 7, wherein the material of the first O-ring is silicon rubber, and the material of the first pressing ring and the material of the second pressing ring are both aluminum alloy.
9. The knob type infrared focusing lens with the focal length of 54mm according to any one of claims 1 to 8, characterized in that a movable lens barrel is arranged in the main lens barrel; the movable lens cone is connected with the main lens cone in an axial sliding manner, and penetrates through the main lens cone through a pin to be connected with a focusing knob; the focusing knob is of an eccentric structure and is connected with an external knob for driving the focusing knob to rotate; the main lens cone is provided with a guide groove for guiding the pin to move; the second meniscus lens is connected with the movable lens cone and moves along with the movement of the movable lens cone.
10. A method for assembling a 54mm focal length knob type infrared focusing lens, which is characterized in that the 54mm focal length knob type infrared focusing lens of claim 9 is used, comprising the steps of: the first meniscus lens is arranged in the front part of the inner cavity of the main lens cone and is fixed with the first O-shaped ring by arranging a first pressing ring; the movable lens cone is arranged in the rear part of the inner cavity of the main lens cone, and the movable lens cone, the main lens cone and the focusing knob are connected together through a pin; and the second meniscus lens is arranged in the inner cavity of the movable lens cone and is fixed by arranging a second pressing ring.
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| CN202111524503.5A CN114236785A (en) | 2021-12-14 | 2021-12-14 | Knob type infrared focusing lens with focal length of 54mm and assembling method thereof |
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| CN202111524503.5A CN114236785A (en) | 2021-12-14 | 2021-12-14 | Knob type infrared focusing lens with focal length of 54mm and assembling method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115201990A (en) * | 2022-09-08 | 2022-10-18 | 成都中科卓尔智能科技集团有限公司 | Light source lens of semiconductor optical material internal defect detection sheet |
| CN116909001A (en) * | 2023-07-14 | 2023-10-20 | 云南驰宏国际锗业有限公司 | High-resolution long-focus infrared sighting telescope |
-
2021
- 2021-12-14 CN CN202111524503.5A patent/CN114236785A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115201990A (en) * | 2022-09-08 | 2022-10-18 | 成都中科卓尔智能科技集团有限公司 | Light source lens of semiconductor optical material internal defect detection sheet |
| CN116909001A (en) * | 2023-07-14 | 2023-10-20 | 云南驰宏国际锗业有限公司 | High-resolution long-focus infrared sighting telescope |
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Application publication date: 20220325 |