CN210690931U - Long-wave infrared zooming optical system for 1K detector - Google Patents
Long-wave infrared zooming optical system for 1K detector Download PDFInfo
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- CN210690931U CN210690931U CN201921572866.4U CN201921572866U CN210690931U CN 210690931 U CN210690931 U CN 210690931U CN 201921572866 U CN201921572866 U CN 201921572866U CN 210690931 U CN210690931 U CN 210690931U
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Abstract
The utility model relates to a long wave infrared optical system that zooms for 1K detector is preceding fixed group, mobilizable continuous variable power group from the object plane to the focal plane in proper order, mobilizable continuous variable power compensation group, after-fixing group, preceding fixed group comprises the convex surface towards the first positive meniscus lens of object plane, and continuous variable power group comprises biconcave negative lens, and continuous variable power compensation group comprises a convex surface towards the meniscus negative lens of object plane and a convex surface towards the positive second meniscus lens of object plane, and after-fixing group comprises a convex surface towards the positive fourth positive meniscus lens and the positive fifth meniscus lens of object plane, keeps the interval unchangeable between preceding fixed group and the after-fixing group. The large-field-of-view high-resolution imaging device has the advantages of large field of view, high imaging resolution, good image quality, wide working temperature range, compact structure, light weight, small volume, high imaging resolution, large field of view, high system transmittance, large relative aperture and the like.
Description
Technical Field
The utility model relates to an optical system, concretely relates to long wave infrared optical system that zooms for 1K detector.
Background
The long-wave infrared optical imaging equipment is widely applied to the fields of security monitoring, intelligent guidance, medical treatment, scientific research and the like. Along with the improvement of the performance and the reduction of the price of the uncooled long-wave infrared detector in recent years, the application field of the uncooled long-wave infrared detector is more extensive, and higher requirements are also put forward on the lens. A long-wave infrared camera for a small photoelectric pod of an unmanned aerial vehicle generally adopts a fixed-focus lens with different focal lengths of 30-80mm, and the long-distance target is difficult to observe due to the fact that the focal length is short and the field of view is large; the long focal length results in small visual field, and is suitable for long-distance observation with limited short-distance observation range. In order to overcome the defect that a fixed-focus lens has a single field of view and cannot give consideration to large-range target search and long-focus observation of target details, the demand of the zoom lens is more and more strong. The current long-wavelength infrared lens is mainly suitable for an area array with 320 x 256 pixels or 640 x 512 pixels, and has the defects of small field of view and low imaging resolution. The novel long-wave infrared area array detector has the advantages that the pixel size is 1280 multiplied by 1024, the pixel size is smaller, the resolution ratio is higher, and an optical lens with better resolution ratio and better imaging quality needs to be matched.
Chinese patent CN201010291525.7 discloses a long-wave infrared zoom lens, which adopts 4 lenses to realize 4 times of zooming, but has 7 aspheric surfaces, high processing cost and difficult adjustment.
The Chinese patent CN201410175883.X discloses a long-wave infrared zoom lens, although the system has an F number of 1 all the time, a large relative aperture, only four lenses and only one aspheric surface, the system is designed for an old-fashioned detector with an image element number of 640 multiplied by 512 and an image element size of 17 mu m, and cannot be applied to a new-type 1K detector. The Chinese patent CN201521046929.4 discloses a long-wave infrared zoom lens, which adopts 5 lenses, the aspheric surface of the lens is as high as 4 surfaces, and a binary diffraction surface is also adopted, but the long-wave infrared zoom lens is designed for an old-fashioned detector with the pixel number of 640 multiplied by 512 and the pixel size of 17 mu m, and cannot be applied to a new-type 1K detector.
Disclosure of Invention
The utility model aims at prior art not enough, provide a long wave infrared optical system that zooms for 1K detector, it provides a simple structure's the optical design that zooms in succession that is applicable to long wave infrared wave band 1K detector, its visual field is great, and imaging resolution is high, has like that matter is good, the operating temperature scope is wide, compact structure, light in weight, small, imaging resolution is high, the visual field is big, system's transmissivity is high and relative aperture advantage such as big.
The purpose of the utility model is realized like this: the utility model provides a long wave infrared optical system that zooms for 1K detector, is preceding fixed group, mobilizable continuous variable power group from the object plane to the focal plane in proper order, mobilizable continuous variable power compensation group, back fixed group, preceding fixed group comprises the first positive meniscus lens of convex surface orientation object plane, continuous variable power group comprises biconcave negative lens, continuous variable power compensation group comprises a convex surface towards the negative meniscus lens of object plane and a convex surface towards the positive second meniscus lens of object plane, keep the interval unchangeable between negative meniscus lens and the positive second meniscus lens of a convex surface towards the object plane in the continuous variable power compensation group, back fixed group comprises a convex surface towards the positive third meniscus lens and the positive fourth meniscus lens of object plane, keeps the interval unchangeable between preceding fixed group and the back fixed group.
The mirror surface of the first positive meniscus lens of the front fixed group facing the object plane is an aspheric surface, and the mirror surface of the third positive meniscus lens of the rear fixed group facing the object plane is an aspheric surface.
The meniscus negative lens material of the continuous zoom compensation group is zinc selenide, and the rest lens materials of the optical system are germanium.
The focus of first positive meniscus lens is 89mm, the focus of biconcave negative lens is-27 mm, the focus of negative meniscus lens is-410 mm, the focus of positive meniscus lens of second 53mm, the positive meniscus lens focus of third is 91mm, the positive meniscus lens focus of fourth 41 mm.
The optical system works in a long-wave infrared band of 8-12 microns, the focal length of the optical system is 20-80mm, and the relative caliber F/# is 1.
The horizontal field angle range of the optical system is 7-28 degrees.
The optical system is adapted to a detector with the pixel number of 1280 multiplied by 1024 and the pixel size of 12 mu m.
Adopt above-mentioned scheme beneficial effect as follows, the utility model provides a simple structure is applicable to the continuous optical system that zooms of long wave infrared band and has realized aberration such as the chromatic aberration of a slice zinc selenide balanced system. The temperature sensor is adopted to be matched with the micro displacement of the detector to realize the compensation of the defocusing of the system, and the system is ensured to have good imaging quality within the temperature range of minus 40 ℃ to 60 ℃ under the continuous zooming. The system only has spherical surface and aspherical surface, thus avoiding the problems of insufficient energy of the optical system, difficult detection of the diffractive optical element and high processing requirement caused by adopting the diffractive optics. The utility model discloses a field angle reaches 7 ° -28 °, is applicable to pixel number 1280 x 1024, and the whole field of view of the new generation uncooled long wave infrared detector of 12 μm of pixel size is greater than 0.4 at-40 ℃ -60 ℃ ambient temperature, and space cut-off frequency 42lp/mm department optical Modulation Transfer Function (MTF) value, is close the diffraction limit, has advantages such as image quality is good, the operating temperature scope is wide, compact structure, light in weight, small, the imaging resolution is high, the visual field is big, the system transmissivity is high and relative aperture is big.
The invention will be further explained with reference to the drawings and the specific embodiments.
Drawings
FIG. 1 is a schematic structural view of the present invention in a long-burnt state;
FIG. 2 is a schematic structural view of the present invention in a middle coke state;
FIG. 3 is a schematic structural view of the present invention in a short-coke state;
FIG. 4 is a graph of MTF in the long focus of the present invention;
FIG. 5 is a graph of MTF at mid-focus of the present invention;
fig. 6 is a graph of MTF in short focus according to the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 6, an embodiment of a long-wavelength infrared zoom optical system for a 1K detector includes, in order from an object plane to a focal plane, a front fixed group 100, a movable continuous zoom group 200, a movable continuous zoom compensation group 300, and a rear fixed group 400, where the front fixed group 100 includes a first positive meniscus lens 110 with a convex surface facing the object plane, the focal length of the optical system is 89mm, and the lens material is germanium. The continuous zoom group 200 is composed of a biconcave negative lens 210, light rays are converged towards the biconcave negative lens 210 through the first meniscus positive lens 110, the biconcave negative lens 210 is used as an active moving element in a zoom system and is a zoom lens of the system, the focal length of the biconcave negative lens 210 is-27 mm, and the lens material is germanium. The light is diverged to a continuous variable power compensation group through the biconcave negative lens 210, the group of lenses consists of a negative meniscus lens 310 and a positive second meniscus lens 320, and the distance between the negative meniscus lens 310 and the positive second meniscus lens 320 with the convex surface facing to the object plane in the continuous variable power compensation group 300 is kept unchanged; the focal length of the negative meniscus lens 310 is-410 mm, the material of the negative meniscus lens 310 is zinc selenide, the focal length of the positive second meniscus lens 320 is 53mm, the material of the positive second meniscus lens 320 is germanium, and the continuous zoom compensation assembly is matched with the zoom assembly to move so that the continuous zoom system obtains a specific optical focal length and simultaneously can eliminate spherical aberration and chromatic aberration of the optical system. The light rays are transmitted into the rear fixed group 400 after passing through the continuous zoom compensation group, the rear fixed group 400 comprises a third positive meniscus lens 410 and a fourth positive meniscus lens 420, the convex surface of each lens faces the object plane, the two lenses are made of germanium material lenses, the focal lengths of the two lenses are 91mm and 41mm respectively, the two lenses bear the main focal power of the system, and simultaneously, the rear fixed group is responsible for eliminating the aberration of the system. The system is internally provided with a temperature sensor, so that the ambient temperature in the optical system can be monitored at any time, and the distance between the long-wave infrared probe and the fourth positive meniscus lens 420 can be modulated according to different temperatures, so that the surface of the probe is positioned near the focus of the optical system.
Preferably, the surface of the first positive meniscus lens 110 facing the object plane is selected to be an aspheric surface, and the surface of the third positive meniscus lens 410 facing the object plane is selected to be an aspheric surface, so that after the two are matched, the aberration generated in the imaging process of the system can be obviously eliminated, and the good imaging quality of the optical system is ensured.
In the implementation, the total length of the optical system is 129mm, the caliber is 80mm, and the focal length is 20-80 mm; the filter is applied to a long-wave infrared detector with an aperture F/# of 1 (the F/# is the F-number which is the reciprocal of the ratio of the relative aperture diameter to the focal length, namely F ═ F/D), the wave band range is 8 mu m-12 mu m, the pixel size is 12 mu m multiplied by 12 mu m, and the number of pixels is 1280 multiplied by 1024.
Table one shows the detailed structural parameters of this embodiment. The radius of curvature is in mm and the thickness is in mm in the table.
From the long focus to the short focus, the distance from the biconcave negative lens 210 to the front fixed group 100 is gradually shortened, and the maximum moving distance is 25 mm; the continuous variable power compensation group consisting of the negative meniscus lens 310 and the positive second meniscus lens 320 gradually approaches the rear fixed group 400 during zooming; the two are matched to realize the continuous change of the focal length of the long-wave infrared optical system from 80mm to 20 mm.
Fig. 4 to 6 are MTFs at different focal lengths according to the present invention, wherein fig. 4 is a long-focus MTF graph, fig. 5 is a middle-focus MTF graph, and fig. 6 is a short-focus MTF graph, respectively. The MTF of the system at 42lp/mm is greater than 0.35 throughout the zoom process, approaching the diffraction limit.
By adopting the scheme, the continuous zooming optical system which is simple in structure and suitable for the long-wavelength infrared band is provided, and aberration such as chromatic aberration of the system is balanced by one piece of zinc selenide. The temperature sensor is adopted to be matched with the micro displacement of the detector to realize the compensation of the defocusing of the system, and the system is ensured to have good imaging quality within the temperature range of minus 40 ℃ to 60 ℃ under the continuous zooming. The system only has spherical surface and aspherical surface, thus avoiding the problems of insufficient energy of the optical system, difficult detection of the diffractive optical element and high processing requirement caused by adopting the diffractive optics. The utility model discloses a field angle reaches 7 ° -28 °, is applicable to pixel number 1280 x 1024, and the whole field of view of the new generation uncooled long wave infrared detector of 12 μm of pixel size is greater than 0.4 at-40 ℃ -60 ℃ ambient temperature, and space cut-off frequency 42lp/mm department optical Modulation Transfer Function (MTF) value, is close the diffraction limit, has advantages such as image quality is good, the operating temperature scope is wide, compact structure, light in weight, small, the imaging resolution is high, the visual field is big, the system transmissivity is high and relative aperture is big. The utility model discloses can regard as the optical system that military and police civilian control, search and trail and aim etc..
The foregoing description of the present invention using examples is intended to be exemplary and not limiting as to the scope of the invention. It will therefore be apparent to those skilled in the art that substitutions and modifications of the features of the invention as described can be made without departing from the scope of the claims set out below.
Claims (9)
1. A long wave infrared zoom optical system for a 1K detector, characterized by: the front fixed group (100) and the movable continuous zoom group (200) are arranged from the object plane to the focal plane in sequence, a movable continuous zoom compensation group (300) and a rear fixed group (400), wherein the front fixed group (100) consists of a first positive meniscus lens (110) with a convex surface facing to an object plane, the continuous variable power group (200) is composed of a biconcave negative lens (210), the continuous variable power compensation group (300) is composed of a negative meniscus lens (310) with a convex surface facing to an object plane and a second positive meniscus lens (320) with a convex surface facing to the object plane, the distance between the negative meniscus lens (310) and a second positive meniscus lens (320) with the convex surface facing the object plane is kept constant in the continuous variable power compensation group (300), the rear fixed group (400) is composed of a third positive meniscus lens (410) and a fourth positive meniscus lens (420) with the convex surface facing the object plane, and the distance between the front fixed group and the rear fixed group is kept unchanged.
2. A long wave infrared zoom optical system for a 1K detector according to claim 1, characterized in that: the mirror surface of the first positive meniscus lens of the front fixed group facing the object plane is an aspheric surface, and the mirror surface of the third positive meniscus lens (410) of the rear fixed group (400) facing the object plane is an aspheric surface.
3. A long wave infrared zoom optical system for a 1K detector according to claim 1 or 2, characterized in that: the material of the meniscus negative lens (310) of the continuous zoom compensation group (300) is zinc selenide, and the material of the rest lenses of the optical system is germanium.
4. A long wave infrared zoom optical system for a 1K detector according to claim 1, characterized in that: the focus of first positive meniscus lens (110) is 89mm, the focus of biconcave negative lens (210) is-27 mm, the focus of negative meniscus lens (310) is-410 mm, the focus of the positive meniscus lens (320) of second 53mm, the focus of the positive meniscus lens (410) of third is 91mm, the positive meniscus lens (420) of fourth is 41 mm.
5. A long wave infrared zoom optical system for a 1K detector according to claim 1, characterized in that: the optical system works in a long-wave infrared band of 8-12 microns, the focal length of the optical system is 20-80mm, and the relative caliber F/# is 1.
6. A long wave infrared zoom optical system for a 1K detector according to claim 1, characterized in that: the horizontal field angle range of the optical system is 7-28 degrees.
7. A long wave infrared zoom optical system for a 1K detector according to claim 1, characterized in that: the optical system is adapted to a detector with the pixel number of 1280 multiplied by 1024 and the pixel size of 12 mu m.
8. A long wave infrared zoom optical system for a 1K detector according to claim 1, characterized in that: the maximum moving distance of the double concave negative lens (210) from the long focus state to the short focus state is 25 mm.
9. A long wave infrared zoom optical system for a 1K detector according to claim 2, characterized in that: the curvature radius of each mirror surface of the optical system in the direction from the object plane to the focal plane is 87.3mm, 122.2mm, -248.4mm, 127.3mm, 468mm, 257.4mm, 176mm, -1591.4mm, 34.2mm, 33.4mm, 31.0mm and 37.1mm in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921572866.4U CN210690931U (en) | 2019-09-20 | 2019-09-20 | Long-wave infrared zooming optical system for 1K detector |
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| CN201921572866.4U CN210690931U (en) | 2019-09-20 | 2019-09-20 | Long-wave infrared zooming optical system for 1K detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731640A (en) * | 2021-01-19 | 2021-04-30 | 昆明云锗高新技术有限公司 | Infrared continuous zooming system working at 14-16 mu m waveband |
| CN113589502A (en) * | 2021-07-05 | 2021-11-02 | 湖北华中光电科技有限公司 | Large-visual-field visible light and near-infrared light common-path zooming imaging system |
| CN114594583A (en) * | 2022-02-28 | 2022-06-07 | 深圳市誉和光学精密刀具有限公司 | Infrared continuous zooming optical system |
| CN115202014A (en) * | 2022-06-02 | 2022-10-18 | 昆明物理研究所 | Compact uncooled long-wave infrared continuous zooming optical system |
-
2019
- 2019-09-20 CN CN201921572866.4U patent/CN210690931U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731640A (en) * | 2021-01-19 | 2021-04-30 | 昆明云锗高新技术有限公司 | Infrared continuous zooming system working at 14-16 mu m waveband |
| CN113589502A (en) * | 2021-07-05 | 2021-11-02 | 湖北华中光电科技有限公司 | Large-visual-field visible light and near-infrared light common-path zooming imaging system |
| CN114594583A (en) * | 2022-02-28 | 2022-06-07 | 深圳市誉和光学精密刀具有限公司 | Infrared continuous zooming optical system |
| CN114594583B (en) * | 2022-02-28 | 2023-08-15 | 深圳市誉和光学精密刀具有限公司 | Infrared continuous zooming optical system |
| CN115202014A (en) * | 2022-06-02 | 2022-10-18 | 昆明物理研究所 | Compact uncooled long-wave infrared continuous zooming optical system |
| CN115202014B (en) * | 2022-06-02 | 2023-11-03 | 昆明物理研究所 | Compact uncooled long-wave infrared continuous zooming optical system |
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