CN114047616B - Medium-wave infrared continuous zooming optical system with meter-level long focal length and hundred-fold zoom ratio - Google Patents
Medium-wave infrared continuous zooming optical system with meter-level long focal length and hundred-fold zoom ratio Download PDFInfo
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- CN114047616B CN114047616B CN202111397277.9A CN202111397277A CN114047616B CN 114047616 B CN114047616 B CN 114047616B CN 202111397277 A CN202111397277 A CN 202111397277A CN 114047616 B CN114047616 B CN 114047616B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 86
- 230000005499 meniscus Effects 0.000 claims description 21
- 229910052732 germanium Inorganic materials 0.000 claims description 9
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
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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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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention belongs to the technical field of optical systems, and particularly relates to a medium-wave infrared continuous zooming optical system with a meter-level long focal length and a hundred-fold zoom ratio. The optical system combines the principle of optical continuous zooming and the principle of diffraction optics based on a mechanical compensation method, realizes 135 x hundred-fold zoom ratio continuous zooming and 1350 mm-meter long focal length at the same time by virtue of multiple groups of axial relative movements of the zoom lens group and the compensation lens group, and has a short focal length maximum field of view larger than 60 degrees and a telephoto ratio of better than 0.32.
Description
Technical Field
The invention belongs to the technical field of optical systems, and particularly relates to a medium-wave infrared continuous zooming optical system with a meter-level long focal length and a hundred-fold zoom ratio.
Background
According to different distances between objects to be observed, the photoelectric observation and monitoring system generally needs to have continuous zoom capability of an optical system, and is used for detecting, identifying, recognizing and monitoring objects with different distances in a large range. The infrared continuous zooming thermal imager is an imaging system with continuously variable focal length, stable image plane position and good image quality in zooming. Therefore, the target image with continuously changed size can be obtained on the image plane, which is very beneficial to the photoelectric observation and monitoring system.
The current infrared continuous zooming optical lens has the zoom ratio of 20 to 50 times, the longest focal length is generally smaller than 800mm, the zoom ratio is lower, and the resolution is insufficient. It is difficult to meet the practical use requirements of ultra-high zoom ratio, ultra-long distance detection and large-scale monitoring. The ultra-high zoom ratio, ultra-long distance detection and large-scale monitoring continuous zoom optical system has very wide application requirements in the fields of military use, police use, civil use, such as photoelectric observation, searching, monitoring and the like.
Disclosure of Invention
In view of the above, the present invention provides a medium-wave infrared continuous zoom optical system with a meter-scale long focal length and a hundred-fold zoom ratio, which combines the principle of optical continuous zooming with the principle of diffractive optics based on a mechanical compensation method, realizes 135×hundred-fold zoom ratio continuous zooming while realizing 1350 mm-scale long focal length, and has a short focal length maximum field of view of greater than 60 °, and a telephoto ratio of better than 0.32, by means of multiple sets of axial relative movements of a zoom lens group and a compensation lens group.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
a meter-scale long-focal length hundred-fold zoom ratio medium-wave infrared continuous zoom optical system comprises a front fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, a front compensation lens group G3 with positive focal power, a rear compensation lens group G4 with negative focal power, a rear fixed lens group G5 with positive focal power and an image surface of a detector, which are coaxially arranged in sequence from an object side to an image side.
Further, the front fixed lens group G1 includes a positive power meniscus lens L11 and a negative power meniscus lens L12 coaxially arranged in order from the object space to the image space; the variable power lens group G2 comprises a biconcave lens L21 with negative focal power; the front compensation lens group G3 includes a positive power biconvex lens L31; the rear compensation lens group G4 includes a negative power biconcave lens L41; the rear fixed lens group G5 includes a positive power meniscus lens L51, a negative power meniscus lens L52, a positive power meniscus lens L53, and a positive power biconvex lens L54 coaxially arranged in this order from the object side to the image side.
Further, the continuous zooming of the meter-scale long-focus hundred-fold zoom ratio medium-wave infrared continuous zooming optical system is realized by moving the zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4 along the optical axis according to a certain rule between the front fixed lens group G1 and the rear fixed lens group G5.
Further, the material of the positive power meniscus lens L11 is silicon with high refractive index, and the material of the negative power meniscus lens L12 is germanium with high refractive index;
further, the negative power biconcave lens L21 is made of silicon having a high refractive index, the positive power biconvex lens L31 is made of germanium having a high refractive index, and the negative power biconcave lens L41 is made of germanium having a high refractive index.
Further, the continuous zoom range of the meter-level long-focus hundred-fold zoom ratio medium-wave infrared continuous zoom optical system is 1500 mm-10 mm; the zoom ratio is: 135-150X; optical system F number: f/5.5.
Further, the continuous zoom range of the meter-level long-focus hundred-fold zoom ratio medium-wave infrared continuous zoom optical system is 1350-10 mm; the zoom ratio is: 135×.
Further, the short focal maximum field of view of the meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system is larger than 60 degrees.
Further, the tele ratio of the optical system of the medium-wave infrared continuous zooming optical system with the meter-scale long focal length hundred-fold zoom ratio is 0.32.
Further, the working wavelength of the meter-level long-focus hundred-fold zoom ratio medium-wave infrared continuous zooming optical system is 3-5 mu m; the detector has a pixel count of 640 x 480 pixels with a size of 15 μm or a pixel count of 320 x 240 pixels with a size of 30 μm.
By adopting the technical scheme, the meter-level long-focus hundred-fold zoom ratio medium-wave infrared continuous zooming optical system has the following advantages:
1 meter class super long focal length
The front fixed lens group G1 bears the main focal power and most spherical aberration of the optical system, and the focal power of the variable-magnification lens group G2, the front compensation lens group G3, the rear compensation lens group G4 and the rear fixed lens group are reasonably distributed, so that the aberration is optimally matched, and the high-quality imaging with the ultra-long focal length of 1350mm is realized.
2 hundred-fold-stage ultrahigh zoom ratio continuous zoom optical system
The 135 x ultrahigh variable power ratio is realized by the variable power lens group G2, the front compensation lens group G3 and the rear compensation lens group G4 which do relative axial movement.
3 high telephoto ratio
The front fixed lens group adopts a plurality of high refractive index optical lenses, bears the main focal power of the whole optical system, compresses the axial dimension of an optical path, and further compresses the axial length of the optical system by optimizing the relative position relationship of the zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4, thereby realizing that the telephoto ratio is better than 0.32.
4 Large-scale monitoring
The maximum field of view of the short focus is more than 60 degrees by optimizing the relative position relation of the zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4 at the short focus position, and wide-angle large-range monitoring is realized.
5 imaging quality is excellent
The aberration of the optical system is corrected by using a special optical surface type such as an aspherical surface or a diffraction surface, and various aberrations are balanced, thereby obtaining an excellent image quality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, 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 disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic view of a 1350mm focal length optical path of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a 1000mm focal length optical path of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system in an embodiment of the invention;
FIG. 3 is a schematic diagram of a 100mm focal length optical path of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system in an embodiment of the invention;
FIG. 4 is a schematic view of a 10mm focal length optical path of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system according to an embodiment of the invention;
FIG. 5 is a chart showing a 1350mm focal length optical path MTF of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system according to an embodiment of the present invention;
FIG. 6 is a diagram of a 1000mm focal length optical path MTF of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system according to an embodiment of the invention;
FIG. 7 is a 100mm focal length optical path MTF diagram of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system in an embodiment of the invention;
FIG. 8 is a diagram of the optical path MTF of a 10mm focal length of a meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system in an embodiment of the invention.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the disclosure by way of illustration, and only the components related to the disclosure are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
In one embodiment of the present invention, a medium wave infrared continuous zoom optical system with a meter-scale long focal length and a hundred-fold zoom ratio is provided, wherein a front fixed lens group G1 with positive focal power, a variable-magnification lens group G2 with negative focal power, a front compensation lens group G3 with positive focal power, a rear compensation lens group G4 with negative focal power, a rear fixed lens group G5 with positive focal power and an image plane of a detector are coaxially arranged in sequence from an object side to an image side.
In the present embodiment, the front fixed lens group G1 includes a positive power meniscus lens L11 and a negative power meniscus lens L12 coaxially arranged in order from the object side to the image side; the variable power lens group G2 includes a negative power biconcave lens L21; the front compensation lens group G3 includes a positive power biconvex lens L31; the rear compensation lens group G4 includes a negative power biconcave lens L41; the rear fixed lens group G5 includes a positive power meniscus lens L51, a negative power meniscus lens L52, a positive power meniscus lens L53, and a positive power biconvex lens L54 coaxially arranged in this order from the object side to the image side.
In the present embodiment, the continuous zooming of the meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zooming optical system is realized by the zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4, which move between the front fixed lens group G1 and the rear fixed lens group G5 according to a certain rule along the optical axis.
In this embodiment, the positive power meniscus lens L11 is made of high refractive index silicon, and the negative power meniscus lens L12 is made of high refractive index germanium;
in this embodiment, the negative power biconcave lens L21 is made of high refractive index silicon, the positive power biconvex lens L31 is made of high refractive index germanium, and the negative power biconcave lens L41 is made of high refractive index germanium.
In the embodiment, the continuous zoom range of the medium-wave infrared continuous zoom optical system with the meter-level long focal length and hundred-fold zoom ratio is 1500 mm-10 mm; the zoom ratio is: 135-150X; optical system F number: f/5.5.
In the embodiment, the continuous zoom range of the medium-wave infrared continuous zoom optical system with the meter-level long focal length and hundred-fold zoom ratio is 1350-10 mm; the zoom ratio is: 135×.
In this embodiment, the short focal maximum field of view of the meter-scale long focal length hundred-fold zoom ratio medium wave infrared continuous zoom optical system is greater than 60 °.
In the present embodiment, the telephoto ratio of the intermediate-wave infrared continuous-zoom optical system of the meter-scale long focal length hundred-fold magnification ratio is 0.32.
In the embodiment, the working wavelength of the meter-level long-focus hundred-fold zoom ratio medium-wave infrared continuous zooming optical system is 3-5 mu m; the number of pixels of the detector is 640×480 pixels in size of 15 μm or 320×240 pixels in size of 30 μm.
The invention relates to a medium-wave infrared continuous zooming optical system configuration with a meter-level long focal length and a hundred-fold zoom ratio. The imaging system comprises a front fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, a front compensation lens group G3 with positive focal power, a rear compensation lens group G4 with negative focal power, a rear fixed lens group G5 with positive focal power and an image surface of a detector, which are coaxially arranged in sequence from an object side to an image side according to the trend of an optical path.
The zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4 relatively move with a certain rule in the zooming process, and continuous zooming imaging is completed.
A front fixed lens group G1 composed of a lens L11 and a lens L12; a magnification-varying lens group G2 composed of lenses L21; a front compensation lens group G3 composed of a lens L31; a rear compensation lens group G4 composed of a lens L41; a rear fixed lens group G5 composed of a lens L51, a lens L52, a lens L53, and a lens L54,
FIG. 1 is a schematic view of a 1350mm focal length optical path;
FIG. 2 is a schematic view of a 1000mm focal length optical path;
FIG. 3 is a schematic view of a 100mm focal length optical path;
FIG. 4 is a schematic view of a 10mm focal length optical path;
FIG. 5 is a 1350mm focal length optical path MTF diagram;
FIG. 6 is a 1000mm focal length optical path MTF diagram;
FIG. 7 is a 100mm focal length optical path MTF diagram;
fig. 8 is a 10mm focal length optical path MTF plot.
The optical parameters of the medium-wave infrared continuous zooming optical system with the meter-scale long focal length and hundred-fold zoom ratio are shown in the following table:
optical parameter table (Unit: mm)
The aspherical equation is:
wherein: r-distance from the optical axis;
r, the curvature radius of the aspheric top point;
k-conic constant;
A. b, C, D-aspheric coefficients.
The diffraction aspheric equation is:
wherein: r-distance from the optical axis;
r, the curvature radius of the aspheric top point;
k-conic constant;
A. b, C, D-aspheric coefficients;
hor—diffraction order;
c 1 、c 2 -diffraction plane coefficients;
n-refractive index of the base material;
n 0 -refractive index of air;
λ 0 -a center wavelength.
In the table, the radius of curvature refers to the radius of curvature of each surface, and the interval refers to the distance between two adjacent surfaces, for example, the interval of the surface S1, that is, the distance between the surface S1 to the surface S2.
Wherein D12 represents the distance between the front fixed lens group G1 and the variable magnification lens group G2; d23 denotes a distance between the variable magnification lens group G2 and the front compensation lens group G3; d34 denotes a distance between the front compensation lens group G3 and the rear compensation lens group G4; d45 denotes a distance between the rear compensation lens group G4 and the rear fixed lens group G5.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the disclosure are intended to be covered by the protection scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (6)
1. The medium wave infrared continuous zooming optical system with the meter-scale long focal length and hundred-fold zoom ratio is characterized in that a front fixed lens group G1 with positive focal power, a zoom lens group G2 with negative focal power, a front compensation lens group G3 with positive focal power, a rear compensation lens group G4 with negative focal power, a rear fixed lens group G5 with positive focal power and an image surface of a detector are coaxially arranged in sequence from an object side to an image side;
the front fixed lens group G1 comprises a positive focal power meniscus lens L11 and a negative focal power meniscus lens L12 which are coaxially arranged in sequence from the object space to the image space; the variable power lens group G2 comprises a biconcave lens L21 with negative focal power; the front compensation lens group G3 includes a positive power biconvex lens L31; the rear compensation lens group G4 includes a negative power biconcave lens L41; the rear fixed lens group G5 comprises a positive focal power meniscus lens L51, a negative focal power meniscus lens L52, a positive focal power meniscus lens L53 and a positive focal power biconvex lens L54 which are coaxially arranged in sequence from the object space to the image space;
the continuous zooming of the meter-scale long-focus hundred-fold zoom ratio medium-wave infrared continuous zooming optical system is realized by moving a zoom lens group G2, a front compensation lens group G3 and a rear compensation lens group G4 along an optical axis according to a certain rule between a front fixed lens group G1 and a rear fixed lens group G5;
the material of the positive focal power meniscus lens L11 is high refractive index silicon, and the material of the negative focal power meniscus lens L12 is high refractive index germanium;
the negative power biconcave lens L21 is made of silicon having a high refractive index, the positive power biconvex lens L31 is made of germanium having a high refractive index, and the negative power biconcave lens L41 is made of germanium having a high refractive index.
2. The meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system according to claim 1, wherein the meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system has a continuous-zoom range of 1500mm to 10mm; the zoom ratio is: 135-150×; optical system F number: f/5.5.
3. The meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system according to claim 2, wherein the meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system has a continuous-zoom range of 1350mm to 10mm; the zoom ratio is: 135×.
4. The meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system according to claim 1, wherein a short-focus maximum field of view of the meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system is greater than 60 °.
5. The meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system according to claim 1, wherein the meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system has a telephoto ratio of 0.32.
6. The meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system according to claim 1, wherein the working wavelength of the meter-scale long-focus hundred-fold-ratio medium-wave infrared continuous-zoom optical system is 3-5 μm; the detector has a pixel count of 640 x 480 pixels with a size of 15 μm or a pixel count of 320 x 240 pixels with a size of 30 μm.
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| CN112305732A (en) * | 2020-11-10 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | Ultra-long focal length high-resolution continuous zooming medium-wave infrared optical system |
| CN112346228A (en) * | 2020-11-23 | 2021-02-09 | 湖北久之洋红外系统股份有限公司 | Infrared continuous zooming optical system based on combined zooming and ultra-large zoom ratio |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI381188B (en) * | 2008-05-14 | 2013-01-01 | Asia Optical Co Inc | Zoom lens |
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2021
- 2021-11-23 CN CN202111397277.9A patent/CN114047616B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH041715A (en) * | 1990-04-19 | 1992-01-07 | Nikon Corp | Internal focusing type telephoto zoom lens |
| JP2010122536A (en) * | 2008-11-20 | 2010-06-03 | Panasonic Corp | Zoom lens |
| CN102411194A (en) * | 2011-11-22 | 2012-04-11 | 河南中光学集团有限公司 | Hundredfold continuous zooming CCD (Charge Coupled Device) lens optical system |
| CN104364695A (en) * | 2012-06-12 | 2015-02-18 | 富士胶片株式会社 | Zoom lens and imaging device |
| CN203981958U (en) * | 2014-06-26 | 2014-12-03 | 北京蓝思泰克科技有限公司 | A kind of large zoom ratio medium wave infrared continuous zoom lens |
| JP2019045697A (en) * | 2017-09-04 | 2019-03-22 | キヤノン株式会社 | Zoom lens and image capturing device having the same |
| CN112305732A (en) * | 2020-11-10 | 2021-02-02 | 湖北久之洋红外系统股份有限公司 | Ultra-long focal length high-resolution continuous zooming medium-wave infrared optical system |
| CN112346228A (en) * | 2020-11-23 | 2021-02-09 | 湖北久之洋红外系统股份有限公司 | Infrared continuous zooming optical system based on combined zooming and ultra-large zoom ratio |
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