CN114047616A - Medium wave infrared continuous zooming optical system with meter-level long focal length and hundred-fold variable power ratio - Google Patents
Medium wave infrared continuous zooming optical system with meter-level long focal length and hundred-fold variable power ratio Download PDFInfo
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- CN114047616A CN114047616A CN202111397277.9A CN202111397277A CN114047616A CN 114047616 A CN114047616 A CN 114047616A CN 202111397277 A CN202111397277 A CN 202111397277A CN 114047616 A CN114047616 A CN 114047616A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 89
- 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
- 238000000034 method Methods 0.000 abstract description 7
- 230000033001 locomotion Effects 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 12
- 238000012544 monitoring process Methods 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000004075 alteration Effects 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000005693 optoelectronics Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 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
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Abstract
The invention belongs to the technical field of optical systems, and particularly relates to a meter-grade long-focal-length hundred-times zoom ratio medium-wave infrared continuous zooming optical system. The optical system is based on the combination of the mechanical compensation method optical continuous zooming principle and the diffraction optical principle, realizes the continuous zooming of 135 multiplied by hundred times and the zoom ratio and the long focal length of 1350mm meter by the axial relative motion of a plurality of groups of zoom lens groups and the compensation lens groups, and has the maximum short-focus visual field larger than 60 degrees and the telephoto ratio superior to 0.32.
Description
Technical Field
The invention belongs to the technical field of optical systems, and particularly relates to a meter-grade long-focal-length hundred-times zoom ratio medium-wave infrared continuous zooming optical system.
Background
According to different distances of targets to be observed, an optical system is generally required to have a continuous zoom capability in an optoelectronic observation and monitoring system, and the optoelectronic observation and monitoring system is respectively used for detection, identification, recognition and large-range monitoring of the targets at different distances. The infrared continuous zooming thermal imager is an imaging system with continuously variable focal length, stable image surface position and good image quality in the zooming process. Therefore, a target image with continuously changed size can be obtained on the image surface, and the method is very beneficial to photoelectric observation and monitoring systems.
The zoom ratio of the current infrared continuous zooming optical lens is between 20 and 50 times, the longest focal length is generally less than 800mm, the zoom ratio is low, and the resolution ratio is insufficient. The practical use requirements of ultra-high zoom ratio, ultra-long distance detection and large-range monitoring are difficult to meet. The application requirements of the ultra-high zoom ratio, ultra-long distance detection and large-range monitoring continuous zooming optical system in military, police and civil fields such as photoelectric observation, search, monitoring and the like are very wide.
Disclosure of Invention
In view of the above, the invention provides a millimeter-scale long focal length hundred-times zoom ratio medium wave infrared continuous zooming optical system, which is based on the combination of the mechanical compensation method optical continuous zooming principle and the diffraction optical principle, and realizes a 1350 mm-scale long focal length while realizing 135 × hundred-times zoom ratio continuous zooming through the multiple groups of axial relative motions of a zoom lens group and a compensation lens group, wherein the maximum short-focus field of view is greater than 60 °, and the telephoto ratio is better than 0.32.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
a meter-level long-focal-length hundred-power zoom ratio medium-wave infrared continuous zooming 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 from an object side to an image side in sequence.
Further, the front fixed lens group G1 includes a positive power meniscus lens L11 and a negative power meniscus lens L12 coaxially arranged in this 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 comprises 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, which are coaxially arranged in this order from the object side to the image side.
Further, continuous zooming of the meter-level long-focal-length hundred-magnification zoom ratio medium-wave infrared continuous zooming optical system is realized by moving along an optical axis between the front fixed lens group G1 and the rear fixed lens group G5 according to a certain rule through the zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4.
Furthermore, 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;
further, 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.
Furthermore, the continuous zooming range of the meter-level long-focal-length hundredfold zooming ratio medium-wave infrared continuous zooming optical system is 1500-10 mm; the zoom ratio is: 135X to 150X; f number of optical system: f/5.5.
Furthermore, the continuous zooming range of the meter-level long-focal-length hundredfold zooming ratio medium-wave infrared continuous zooming optical system is 1350 mm-10 mm; the zoom ratio is: 135 x.
Further, the short-focus maximum field of view of the meter-level long-focus variable-power-ratio medium-wave infrared continuous zooming optical system is larger than 60 degrees.
Further, the telephoto ratio of the optical system of the meter-level long-focal-length hundred-times zoom ratio medium-wave infrared continuous zooming optical system is 0.32.
Furthermore, the working wavelength of the meter-level long-focal-length hundred-magnification-ratio medium-wave infrared continuous zooming optical system is 3-5 μm; the detector has a pixel size of 640 x 480 pixels of 15 μm or a pixel size of 320 x 240 pixels of 30 μm.
By adopting the technical scheme, the meter-level long-focal-length hundred-times zoom ratio medium-wave infrared continuous zooming optical system has the following advantages:
1 meter ultra-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 power lens group G2, the front compensation lens group G3, the rear compensation lens group G4 and the rear fixed lens group are reasonably distributed, the optimized matching of aberration is carried out, and the high-quality imaging of 1350mm super-long focal length is realized.
2 hundred-power-level ultrahigh zoom ratio continuous zooming optics
135 × super high zoom ratio is realized by the relative axial movement of the zoom lens group G2, the front compensation lens group G3, and the rear compensation lens group G4.
3 high telephoto ratio
The front fixed lens group adopts a plurality of high-refractivity optical lenses, bears the main focal power of the whole optical system, compresses the axial size of a light path, 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, and realizes that the telephoto ratio is superior to 0.32.
4 monitoring in a large area
In the short-focus position, the maximum short-focus visual field is larger 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, and wide-angle and large-range monitoring is realized.
5 the imaging quality is excellent
The aberration of the optical system is corrected by using special optical surface types such as an aspherical surface and a diffraction surface, so that various aberrations are balanced and excellent image quality is obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a 1350mm focal length optical path diagram of a meter-scale long-focal-length hundredfold zoom ratio medium-wave infrared continuous zooming optical system in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a 1000mm focal length optical path of a meter-level long-focal-length hundredfold zoom ratio medium-wave infrared continuous zooming optical system in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a 100mm focal length optical path of a meter-scale long-focal-length hundredfold zoom ratio medium-wave infrared continuous zooming optical system in an embodiment of the present invention;
FIG. 4 is a 10mm focal length optical path diagram of a meter-level long-focal-length hundredfold zoom ratio medium-wave infrared continuous zooming optical system in an embodiment of the present invention;
FIG. 5 is a 1350mm focal length optical path MTF diagram of the meter-scale long-focal-length hundredfold zoom ratio medium-wave infrared continuous zoom optical system in accordance with an embodiment of the present invention;
FIG. 6 is an MTF diagram of 1000mm focal length optical path of the mid-wave infrared continuous zoom optical system with a meter-level long focal length and a variable power ratio;
FIG. 7 is a 100mm focal length light path MTF diagram of a meter-scale long focal length hundredfold zoom ratio medium wave infrared continuous zooming optical system in an embodiment of the present invention;
fig. 8 is an MTF diagram of 10mm focal length optical path of the meter-level long-focal-length hundredfold zoom ratio medium-wave infrared continuous zooming optical system in the embodiment of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended 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 disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects 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. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate 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 invention, a meter-scale long focal length hundred-power zoom ratio medium-wave infrared continuous zooming optical system is provided, and 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 the object side to the 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 double convex lens L54, which are coaxially arranged in this order from the object side to the image side.
In the embodiment, continuous zooming of the mid-wave infrared continuous zooming optical system with the meter-class long focal length and the hundred-fold variable power ratio is realized by moving the zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4 between the front fixed lens group G1 and the rear fixed lens group G5 along the optical axis according to a certain rule.
In this embodiment, the positive power meniscus lens L11 is made of high refractive index silicon negative power meniscus lens L12 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 meter-level long-focal-length hundredfold zoom ratio medium-wave infrared continuous zoom optical system is 1500 mm-10 mm; the zoom ratio is: 135X to 150X; f number of optical system: f/5.5.
In the embodiment, the continuous zooming range of the meter-level long-focal-length hundredfold zooming ratio medium-wave infrared continuous zooming optical system is 1350 mm-10 mm; the zoom ratio is: 135 x.
In the present embodiment, the short-focus maximum field of view of the meter-level long-focus variable-power ratio medium-wave infrared continuous zoom optical system is greater than 60 °.
In this embodiment, the telephoto ratio of the optical system of the mid-wave infrared continuous zoom optical system is 0.32.
In the embodiment, the working wavelength of the meter-level long-focal-length hundred-magnification-ratio medium-wave infrared continuous zooming optical system is 3-5 μm; the detector has a pixel size of 15 μm for 640 × 480 pixels or 30 μm for 320 × 240 pixels.
The invention relates to a meter-level long focal length hundred-time zoom ratio medium wave infrared continuous zooming optical system structure. The optical path direction comprises a front fixed lens group G1 with positive focal power, a variable power 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 the detector, which are coaxially arranged in sequence from an object side to an image side.
The zoom lens group G2, the front compensation lens group G3 and the rear compensation lens group G4 move relatively in a certain rule in the zooming process, and continuous zooming imaging is completed.
A front fixed lens group G1, which consists of a lens L11 and a lens L12; a variable power lens group G2 composed of a lens L21; a front compensation lens group G3 consisting of a lens L31; a rear compensation lens group G4 consisting of a lens L41; a rear fixed lens group G5, which consists of a lens L51, a lens L52, a lens L53 and a lens L54,
FIG. 1 is a 1350mm focal length optical path diagram;
FIG. 2 is a schematic diagram of a 1000mm focal length optical path;
FIG. 3 is a schematic diagram of a 100mm focal length optical path;
FIG. 4 is a schematic diagram of a 10mm focal length optical path;
FIG. 5 is a 1350mm focus optical path MTF plot;
FIG. 6 is a 1000mm focus optical path MTF plot;
FIG. 7 is a 100mm focus optical path MTF plot;
FIG. 8 is a 10mm focus optical path MTF plot.
The optical parameters of the millimeter-scale long-focal-length hundred-magnification-ratio medium-wave infrared continuous zooming optical system of the embodiment are shown in the following table:
optical parameter table (Unit: mm)
The aspheric equation is:
wherein: r-distance from the optical axis;
r is the curvature radius of the aspheric surface vertex;
k is the conic constant;
A. b, C, D-aspheric coefficients.
The diffractive aspheric equation is:
wherein: r-distance from the optical axis;
r is the curvature radius of the aspheric surface vertex;
k is the conic constant;
A. b, C, D-aspherical surface coefficients;
HOR-diffraction order;
c1、c2-the diffraction surface coefficients;
n-refractive index of base material;
n0-refractive index of air;
λ0-a central wavelength.
In the table, the radius of curvature refers to the radius of curvature of each surface, and the spacing refers to the distance between two adjacent surfaces, for example, the spacing of the surface S1, i.e., the distance from 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 represents the distance between the variable magnification lens group G2 and the front compensation lens group G3; d34 denotes the distance between the front compensation lens group G3 and the rear compensation lens group G4; d45 represents the distance between the rear compensation lens group G4 and the rear fixed lens group G5.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present 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 present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. The mid-wave infrared continuous zooming optical system 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.
2. The mid-wave infrared continuous zoom optical system with focal length in hundred times and power ratio in meter scale of claim 1, characterized in that the front fixed lens group G1 comprises a positive power meniscus lens L11 and a negative power meniscus lens L12 coaxially arranged in sequence 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 comprises 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, which are coaxially arranged in this order from the object side to the image side.
3. The mid-wave infrared continuous zooming optical system with the m-scale long focal length and the hundred-fold variable power ratio as claimed in claim 1, wherein the continuous zooming of the mid-wave infrared continuous zooming optical system with the m-scale long focal length and the hundred-fold variable power ratio is realized by moving the front fixed lens group G1 and the rear fixed lens group G5 along the optical axis in a certain rule through the variable power lens group G2, the front compensation lens group G3 and the rear compensation lens group G4.
4. The system of claim 2, wherein the positive power meniscus lens L11 is high refractive silicon and the negative power meniscus lens L12 is high refractive germanium.
5. The mid-wave infrared continuous zoom optical system with a focal length in hundred-fold variable power ratio in a meter scale of claim 1, wherein the negative-power biconcave lens L21 is made of high-refractivity silicon, the positive-power biconvex lens L31 is made of high-refractivity germanium, and the negative-power biconcave lens L41 is made of high-refractivity germanium.
6. The meter-level long focal length hundred-fold zoom ratio medium-wave infrared continuous zoom optical system according to claim 1, wherein the meter-level long focal length hundred-fold zoom ratio medium-wave infrared continuous zoom optical system has a continuous zoom range of 1500mm to 10 mm; the zoom ratio is: 135X to 150X; f number of optical system: f/5.5.
7. The meter-level long focal length hundred-fold zoom ratio medium-wave infrared continuous zoom optical system according to claim 6, wherein the meter-level long focal length hundred-fold zoom ratio medium-wave infrared continuous zoom optical system has a continuous zoom range of 1350mm to 10 mm; the zoom ratio is: 135 x.
8. The mid-wave infrared continuous zoom optical system with millimeter-scale long focal length and hundred-fold power variation ratio as claimed in claim 1, wherein the short-focus maximum field of view of the mid-wave infrared continuous zoom optical system with millimeter-scale long focal length and hundred-fold power variation ratio is greater than 60 °.
9. The m-scale long focal length hundred-times zoom ratio medium wave infrared continuous zoom optical system according to claim 1, wherein the telephoto ratio of the m-scale long focal length hundred-times zoom ratio medium wave infrared continuous zoom optical system is 0.32.
10. The meter-scale long focal length hundred-times zoom ratio medium-wave infrared continuous zooming optical system of claim 1, characterized in that the operating wavelength of the meter-scale long focal length hundred-times zoom ratio medium-wave infrared continuous zooming optical system is 3 μm to 5 μm; the detector has a pixel size of 640 x 480 pixels of 15 μm or a pixel size of 320 x 240 pixels of 30 μm.
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| CN112305732A (en) * | 2020-11-10 | 2021-02-02 | 湖北久之洋红外***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***股份有限公司 | Infrared continuous zooming optical system based on combined zooming and ultra-large zoom ratio |
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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 |
| US20090284842A1 (en) * | 2008-05-14 | 2009-11-19 | Yu-Min Chang | Zoom lens system |
| 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 |
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| CN112346228A (en) * | 2020-11-23 | 2021-02-09 | 湖北久之洋红外***股份有限公司 | Infrared continuous zooming optical system based on combined zooming and ultra-large zoom ratio |
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