CN114460728A - Microminiature medium wave refrigeration infrared continuous zooming optical system - Google Patents
Microminiature medium wave refrigeration infrared continuous zooming optical system Download PDFInfo
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- CN114460728A CN114460728A CN202210096912.8A CN202210096912A CN114460728A CN 114460728 A CN114460728 A CN 114460728A CN 202210096912 A CN202210096912 A CN 202210096912A CN 114460728 A CN114460728 A CN 114460728A
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- 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
- G02B15/143—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 three groups only
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- G—PHYSICS
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- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
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Abstract
A microminiature medium wave refrigeration infrared continuous zooming optical system relates to the technical field of optical systems, and comprises a first positive meniscus lens, a first negative meniscus lens, a double-concave negative lens, a double-convex positive lens, a second positive meniscus lens, a second negative meniscus lens, a third positive meniscus lens, a fourth positive meniscus lens and an infrared detector which are sequentially arranged from an object side to an image side along the same optical axis; the first positive meniscus lens, the first negative meniscus lens, the second positive meniscus lens and the second negative meniscus lens are all arranged in a bent way towards the image space; the third positive meniscus lens and the fourth positive meniscus lens are both arranged in a bent manner towards the object; the focal length of the optical system is 15 mm-300 mm, the total length from the front surface of the first meniscus positive lens to the image surface is less than 137mm, the zoom ratio is large, the total optical length is small, a target image can be kept clear all the time in the zooming process, and the transformation of any view field in the zooming range can be realized.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a microminiature medium wave refrigeration infrared continuous zooming optical system.
Background
At present, an airborne photoelectric pod system is high in integration level, and multiple photoelectric sensors are mounted on the airborne photoelectric pod system, so that wide-spectrum and multi-band target detection is realized; because the size and the weight of an airborne photoelectric system are limited, the miniaturization design of a thermal infrared imager and other photoelectric sensors is of great importance;
the Chinese patent application with the application number of 201710547355.6 discloses a medium-wave infrared continuous zoom lens with a large zoom ratio, the zoom ratio of the system is 12 times, the optical system is long and large in volume, and the requirements of miniaturization and light weight are difficult to meet in practical application;
the Chinese patent application with the application number of 201810314997.6 discloses an infrared continuous zooming optical system with large relative aperture and high zoom ratio, wherein the focal length of a long-focus end of the system is 330mm, the total optical length is 460mm, and the defects of low resolving power and large volume of the long-focus end on a long-distance target exist;
a paper published by the royal sea and the like and entitled design of a medium-wave infrared continuous zooming optical system with large zoom ratio is published on pages 398 to 402 in No. 2 of volume 42 published by Infrared and laser engineering in 2013, 2 months in China journal; the medium wave infrared continuous zooming optical system with large zoom ratio by adopting a three-time imaging technology is introduced; the F number of the system is 4, and continuous zooming of 23-701 mm can be realized; the system adopts 10 lenses, the overall dimension of the system is 345mm multiplied by 176mm multiplied by 224mm (length multiplied by width multiplied by height), the defects of low optical transmittance and large volume exist, and the system is difficult to be applied to small airborne photoelectric equipment;
a paper entitled "design of a high-definition medium-wave infrared continuous zooming optical system with large zoom ratio" published by Chenjinjin and the like is published in pages 42, No. 10, 2742-2747, published by Infrared and laser engineering in 2013, 10 months in China journal; the medium wave infrared continuous zooming optical system with the large zoom ratio, the F number of which is 4 and the zooming range of which is 15-550 mm is introduced, the size of the folded optical system is 390mm multiplied by 137.5mm multiplied by 110mm (length multiplied by width multiplied by height), the total length/focal length ratio of the system is about 0.7, the defect of large volume exists, and the system is difficult to popularize and apply in small airborne photoelectric equipment which has strict requirements on the volume and the weight of a thermal infrared imager;
a paper entitled design of a compact large zoom ratio infrared optical system published by Qurui and the like is published in the 46 th page of 1104002-1 to 1104002-5 of volume 11, published by Infrared and laser engineering in 11 months of 2017 in China journal; the design of an infrared optical system with a large zoom ratio, wherein the F number is 4, the zoom range is 6.5-455 mm, the system uses 10 lenses, the total length is 300mm, the ratio of the total length to the focal length of the system is about 0.66, and the defects of large number of lenses, low optical transmittance and large volume exist; in addition, the compensation group of the system consists of 3 lenses, the number is large, the weight is heavy, and the driving difficulty of the compensation group is large.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a microminiature medium wave refrigeration infrared continuous zooming optical system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a microminiature medium wave refrigeration infrared continuous zooming optical system comprises a first positive meniscus lens, a first negative meniscus lens, a double-concave negative lens, a double-convex positive lens, a second positive meniscus lens, a second negative meniscus lens, a third positive meniscus lens, a fourth positive meniscus lens and an infrared detector which are sequentially arranged from an object side to an image side along the same optical axis; the first positive meniscus lens, the first negative meniscus lens, the second positive meniscus lens and the second negative meniscus lens are all arranged in a bent way towards the image space; the third positive meniscus lens and the fourth positive meniscus lens are both arranged in a bent manner towards the object; the double-concave negative lens is a zoom lens, the focal length change is realized by moving the double-concave negative lens along an optical axis, the focal length change is realized by keeping the double-concave negative lens away from a first meniscus negative lens from left to right in the change process from a short focus of 15mm to a long focus of 300mm, the double-convex positive lens is a first compensation lens, a second meniscus positive lens is a second compensation lens, the defocusing of an image surface caused by the movement of the zoom lens is compensated by the independent movement of the double-convex positive lens and the second meniscus positive lens along the optical axis respectively, so that the clear imaging in the zooming process is realized, and the double-convex positive lens and the second meniscus positive lens are close to the first meniscus negative lens from right to left in the change process from the short focus of 15mm to the long focus of 300 mm; the first positive meniscus lens, the first negative meniscus lens, the second negative meniscus lens, the third positive meniscus lens and the fourth positive meniscus lens are fixed lenses and keep in place in the zooming process.
Preferably, an aperture diaphragm is arranged at the exit pupil, and the aperture diaphragm is superposed with a cold diaphragm of the infrared detector.
Preferably, the primary image plane is located between the second negative meniscus lens and the third positive meniscus lens.
Preferably, the optical material of the first positive meniscus lens is a silicon material, the optical material of the first negative meniscus lens is a single-crystal germanium material, the optical material of the double-concave negative lens is a single-crystal germanium material, the optical material of the double-convex positive lens is a silicon material, the optical material of the second positive meniscus lens is a zinc selenide material, the optical material of the second negative meniscus lens is a single-crystal germanium material, the optical material of the third positive meniscus lens is a silicon material, and the optical material of the fourth positive meniscus lens is a single-crystal germanium material.
Preferably, the focal length of the first positive meniscus lens, the first negative meniscus lens, the double-concave negative lens, the double-convex positive lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens and the fourth positive meniscus lens satisfies the following conditions:
3.0f≤f1≤3.2f，-17.0f≤f2≤-16.0f，-0.60f≤f3≤-0.50f，0.95f≤f4≤1.15f，3.2f≤f5≤3.6f，-0.9f≤f6≤-0.7f，0.3f≤f7≤0.5f，1.45f≤f8≤1.65f；
wherein f is the focal length of the optical system in short focus;
f1is the effective focal length of the first meniscus positive lens;
f2is the effective focal length of the first negative meniscus lens;
f3is the effective focal length of the biconcave negative lens;
f4is the effective focal length of the biconvex positive lens;
f5is the effective focal length of the second meniscus positive lens;
f6is the effective focal length of the second negative meniscus lens;
f7is the effective focal length of the third meniscus positive lens;
f8is the effective focal length of the fourth meniscus positive lens。
Preferably, the surface S3 of the first negative meniscus lens facing the object, the surface S5 of the double negative meniscus lens facing the object, the surface S9 of the second positive meniscus lens facing the object, and the surface S16 of the fourth positive meniscus lens facing the image are all even aspheric surfaces, and the surface equation is as follows:
where z is a distance vector from a vertex of the aspheric surface when the aspheric surface is at a position having a height R along the optical axis direction, C is a curvature, C is 1/R, R represents a curvature radius of the lens surface, R is a radial coordinate of the lens surface in a direction perpendicular to the optical axis, k is a conic constant of the lens surface, a is a fourth-order aspheric coefficient of the lens surface, B is a sixth-order aspheric coefficient of the lens surface, and C is an eighth-order aspheric coefficient of the lens surface.
Preferably, the surface S11 of the second negative meniscus lens facing the object is a diffractive aspheric surface, the aspheric surface and the diffractive surface act on the same lens surface, and the surface equation is:
wherein z is a distance rise from a vertex of the aspheric surface when the aspheric surface is at a position with a height of R along the optical axis direction, C is a curvature, C is 1/R, R represents a curvature radius of the lens surface, R is a radial coordinate of the lens surface in a direction perpendicular to the optical axis, k is a conic constant of the lens surface, a is a fourth-order aspheric coefficient of the lens surface, B is a sixth-order aspheric coefficient of the lens surface, and C is an eighth-order aspheric coefficient of the lens surface; HOR is the diffraction order of the lens surface, C1、C2、C3Is the diffraction coefficient of the lens surface, n is the refractive index of the lens optical material, n0Is the refractive index of air, λ0The center wavelength is designed for the optical system.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention discloses a microminiature medium wave refrigeration infrared continuous zooming optical system,
1. by adopting a three-component zooming mode, a 20-time continuous zooming optical system with the length of 15-300 mm is realized, the total optical length of the continuous zooming optical system is 137mm, the ratio of the total length to the maximum focal length is 0.46, the system has the characteristics of small total optical length and large zoom ratio, and is suitable for a small and medium-sized airborne photoelectric pod system with severe requirements on the volume and weight of the optical system;
2. the zooming curve of the system is smooth and continuous, and has no abrupt point, so that the clamping stagnation phenomenon of the system in the zooming process can be effectively avoided;
3. by adopting a secondary imaging system, the diaphragm is arranged at the exit pupil to ensure that the diaphragm is superposed with the cold diaphragm of the refrigeration infrared detector, so that the system realizes the cold diaphragm efficiency of 100 percent, the beam cutting cannot be caused, the energy loss is reduced, and the system response sensitivity is improved;
4. the target image can be kept clear all the time in the zooming process, and the transformation of any view field in the zooming range can be realized; when the system is applied to an airborne photoelectric pod, the system cannot lose a tracking target in the continuous zooming process, and a proper working view field can be selected according to the scene and the target characteristics, so that the man-machine efficiency is greatly improved.
Drawings
FIG. 1 is a diagram of the optical path of the optical system with a focal length of 300 mm;
FIG. 2 is a diagram of the optical path of the optical system at a focal length of 160 mm;
FIG. 3 is a diagram of the optical path of the optical system with a focal length of 15 mm;
FIG. 4 is a diagram of the transfer function of the optical system at a focal length of 300 mm;
FIG. 5 is a diagram of the transfer function of the optical system at a focal length of 160 mm;
FIG. 6 is a graph of the transfer function for a focal length of the optical system of 15 mm;
FIG. 7 is a diagram of a focal length of the optical system at 300 mm;
FIG. 8 is a diagram of the focal length of the optical system at 160 mm;
FIG. 9 is a diagram of a focal length of the optical system at 15 mm;
FIG. 10 is a graph of curvature of field and distortion for a focal length of 300 mm;
FIG. 11 is a diagram of the curvature of field and distortion when the focal length of the optical system is 160 mm;
FIG. 12 is a graph showing the curvature of field and distortion at a focal length of 15mm for the optical system;
FIG. 13 is a zoom graph of the optical system;
FIG. 14 shows parameters of lenses of an optical system of the present invention;
FIG. 15 shows the aspheric coefficients of S3, S5, S9 and S16 in accordance with the present invention;
FIG. 16 shows the diffractive aspheric coefficients of S11 according to the present invention; .
In the figure: 1. a first meniscus positive lens; 2. a first negative meniscus lens; 3. a biconcave negative lens; 4. a biconvex positive lens; 5. a second meniscus positive lens; 6. a second negative meniscus lens; 7. a third meniscus positive lens; 8. a fourth meniscus positive lens; 9. an infrared detector.
Detailed Description
The present invention will be explained in detail by the following embodiments, and the purpose of disclosing the invention is to protect all technical improvements within the scope of the present invention, in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., it is only corresponding to the drawings of the present application, and it is convenient to describe the present invention, and it is not intended to indicate or imply that the referred device or element must have a specific orientation.
With reference to fig. 1 to 3, a micro-miniature medium wave refrigeration infrared continuous zooming optical system, wherein the direction close to an object space is an object space, the direction close to an image space is an image space, and the direction from the object space to the image space, two surfaces of a lens are an incident surface and an emergent surface in sequence, and comprises a first positive meniscus lens 1, a first negative meniscus lens 2, a double-concave negative lens 3, a double-convex positive lens 4, a second positive meniscus lens 5, a second negative meniscus lens 6, a third positive meniscus lens 7, a fourth positive meniscus lens 8 and an infrared detector 9 which are arranged in sequence from the object space to the image space along the same optical axis; the first positive meniscus lens 1, the first negative meniscus lens 2, the second positive meniscus lens 5 and the second negative meniscus lens 6 are all arranged in a bent direction towards the image; the third positive meniscus lens 7 and the fourth positive meniscus lens 8 are both arranged in a bent manner towards the object;
as shown in FIG. 13, for the zoom profile of the continuous zoom optical system, the biconcave negative lens 3 is a zoom lens, the focal length variation is realized by the independent movement of the biconcave negative lens 3 along the optical axis in a predetermined relationship, the biconcave negative lens 3 is away from the first negative meniscus lens from left to right in the variation process from the short focus of 15mm to the long focus of 300mm, the stroke is 24.2mm, the biconvex positive lens 4 is a first compensation lens, the second positive meniscus lens 5 is a second compensation lens, the image plane caused by the movement of the zoom lens is compensated by the independent movement of the biconvex positive lens 4 and the second positive meniscus lens 5 along the optical axis, thereby realizing the clear image formation in the zooming process, the movement stroke of the biconvex positive lens 4 is 15mm, the movement stroke of the second positive meniscus lens 5 is 1.48mm, the positive lens 4, the negative lens, the double meniscus positive lens 5, the double meniscus positive lens 4, the double lens, and the double lens are arranged in the double lens, the double lens 4, the double lens are arranged in the double lens, the second positive meniscus lenses 5 are all close to the first negative meniscus lens from right to left; as can be seen from fig. 13, the zooming curve of the optical system of the present invention is smooth and continuous, and there is no discontinuity, so that the system can be effectively prevented from generating a jamming phenomenon during zooming; the first positive meniscus lens 1, the first negative meniscus lens 2, the second negative meniscus lens 6, the third positive meniscus lens 7 and the fourth positive meniscus lens 8 are fixed lenses and are kept in place in the zooming process.
The primary image surface is positioned between the second negative meniscus lens 6 and the third positive meniscus lens 7, and a field stop is arranged at the primary image surface, so that the influence of stray light on system imaging can be effectively reduced, and the signal-to-noise ratio of the system is improved; an aperture diaphragm is arranged at the exit pupil and is superposed with a cold diaphragm of the infrared detector, so that the 100% cold diaphragm efficiency is realized, the energy loss of light beams is reduced, and the system sensitivity is improved; according to the requirements, the optical material of the first positive meniscus lens 1 is a silicon material, the optical material of the first negative meniscus lens 2 is a single-crystal germanium material, the optical material of the double-concave negative lens 3 is a single-crystal germanium material, the optical material of the double-convex positive lens 4 is a silicon material, the optical material of the second positive meniscus lens 5 is a zinc selenide material, the optical material of the second negative meniscus lens 6 is a single-crystal germanium material, the optical material of the third positive meniscus lens 7 is a silicon material, and the optical material of the fourth positive meniscus lens 8 is a single-crystal germanium material;
the focal length of the first positive meniscus lens 1, the first negative meniscus lens 2, the biconcave negative lens 3, the biconvex positive lens 4, the second positive meniscus lens 5, the second negative meniscus lens 6, the third positive meniscus lens 7 and the fourth positive meniscus lens 8 meets the following conditions:
3.0f≤f1≤3.2f，-17.0f≤f2≤-16.0f，-0.60f≤f3≤-0.50f，0.95f≤f4≤1.15f，3.2f≤f5≤3.6f，-0.9f≤f6≤-0.7f，0.3f≤f7≤0.5f，1.45f≤f8≤1.65f；
wherein f is the focal length of the optical system in short focus;
f1is the effective focal length of the first meniscus positive lens 1;
f2is the effective focal length of the first negative meniscus lens 2;
f3the effective focal length of the biconcave negative lens 3;
f4the effective focal length of the biconvex positive lens 4;
f5is the effective focal length of the second meniscus positive lens 5;
f6is the effective focal length of the second negative meniscus lens 6;
f7is the effective focal length of the third positive meniscus lens 7;
f8is the effective focal length of the fourth meniscus positive lens 8;
the surface S3 of the first negative meniscus lens 2 facing the object side, the surface S5 of the double-concave negative lens 3 facing the object side, the surface S9 of the second positive meniscus lens 5 facing the object side, and the surface S16 of the fourth positive meniscus lens (8) facing the image side all adopt even aspheric surfaces, and the surface equation is as follows:
wherein z is a distance rise from a vertex of the aspheric surface when the aspheric surface is at a position with a height of R along the optical axis direction, C is a curvature, C is 1/R, R represents a curvature radius of the lens surface, R is a radial coordinate of the lens surface in a direction perpendicular to the optical axis, k is a conic constant of the lens surface, a is a fourth-order aspheric coefficient of the lens surface, B is a sixth-order aspheric coefficient of the lens surface, and C is an eighth-order aspheric coefficient of the lens surface;
the surface S11 of the second negative meniscus lens 6 facing the object side is a diffractive aspheric surface, the aspheric surface and the diffractive surface act on the same lens surface, and the surface equation is as follows:
wherein z is a distance rise from a vertex of the aspheric surface when the aspheric surface is at a position with a height of R along the optical axis direction, C is a curvature, C is 1/R, R represents a curvature radius of the lens surface, R is a radial coordinate of the lens surface in a direction perpendicular to the optical axis, k is a conic constant of the lens surface, a is a fourth-order aspheric coefficient of the lens surface, B is a sixth-order aspheric coefficient of the lens surface, and C is an eighth-order aspheric coefficient of the lens surface; HOR is the diffraction order of the lens surface, C1、C2、C3Is the diffraction coefficient of the lens surface, n is the refractive index of the lens optical material, n0Is the refractive index of air, λ0Designing a center wavelength for the optical system;
in specific optical path transmission, light emitted by infrared radiation of an external scene is converged by a first positive meniscus lens 1 and then reaches a first negative meniscus lens 2, is diverged by the first negative meniscus lens 2 and then reaches a double-concave negative lens 3, is diverged by the double-concave negative lens 3 and then reaches a double-convex positive lens 4, is converged by the double-convex positive lens 4 and then reaches a second positive meniscus lens 5, is converged by the second positive meniscus lens 5 and then reaches a second negative meniscus lens 6, is diverged by the second negative meniscus lens 6 and then reaches a third positive meniscus lens 7, is converged by the third positive meniscus lens 7 and then reaches a fourth positive meniscus lens 8, and the fourth positive meniscus lens 8 is converged and then imaged on an infrared detector 9.
The first embodiment is as follows:
the technical indexes of the optical system are as follows:
adapting the detector: a 640 x 512, 15 μm medium wave refrigerating focal plane detector;
the working wave band is as follows: 3.7-4.8 μm;
relative pore diameter: 1: 4;
focal length: 15 mm-300 mm;
visual field: 35.49 degrees x 28.72 degrees-1.83 degrees x 1.47 degrees;
total optical length (TTL): less than or equal to 137 mm;
TTL (total optical length)/fmax(longest focal length): less than or equal to 0.46;
as shown in fig. 14, the detailed data of each lens (including the surface type, curvature radius, thickness, caliber and material of each lens, wherein the unit of curvature radius, thickness and caliber of the lens is mm, and the curvature radius of the spherical surface and the aspherical surface refers to the curvature radius at the intersection point of the lens surface and the optical axis) when the focal length of the optical system of the present invention is 15mm to 300 mm;
as shown in FIG. 15, the aspheric coefficients of the surface S3 of the first negative meniscus lens 2 facing the object, the surface S5 of the double-concave negative lens 3 facing the object, the surface S9 of the second positive meniscus lens 5 facing the object, and the surface S16 of the fourth positive meniscus lens 8 facing the image (scientific notation is used in the table, for example-1.1072672 e-007 means-1.1072672 × 10-7)；
As shown in fig. 16, the diffractive aspheric coefficient of the object side surface S11 of the second meniscus negative lens 6;
through optical design software simulation, as shown in fig. 4, 5 and 6, when the spatial frequency is 30lp/mm, the transfer functions of the optical system in the states of 300mm, 160mm and 15mm focal length are all larger than 0.2;
as shown in fig. 7, 8 and 9, the focal lengths of the optical system are 300mm, 160mm and 15mm, and the diffuse speckle RMS value in each focal length state is equivalent to the pixel size of the detector;
as shown in fig. 10, 11 and 12, the distortion of the optical system is less than 3% in the state of focal length 300mm and 160mm, and less than 5% in the state of 15mm, which satisfies the application requirements.
The invention is not described in detail in the prior art, and it is apparent to a person skilled in the art that the invention is not limited to details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Claims (7)
1. A microminiature medium wave refrigeration infrared continuous zooming optical system is characterized in that: the infrared detector comprises a first positive meniscus lens (1), a first negative meniscus lens (2), a double-concave negative lens (3), a double-convex positive lens (4), a second positive meniscus lens (5), a second negative meniscus lens (6), a third positive meniscus lens (7), a fourth positive meniscus lens (8) and an infrared detector (9), which are arranged in sequence from an object side to an image side along the same optical axis; the first positive meniscus lens (1), the first negative meniscus lens (2), the second positive meniscus lens (5) and the second negative meniscus lens (6) are all arranged in a bent direction towards the image; the third positive meniscus lens (7) and the fourth positive meniscus lens (8) are both arranged in a bent manner towards the object; the first positive meniscus lens (1) and the first negative meniscus lens (2) are front fixed lenses, the second negative meniscus lens (6), the third positive meniscus lens (7) and the fourth positive meniscus lens (8) are rear fixed lenses; the double-concave negative lens (3) is a zoom lens, focal length change is realized through the movement of the double-concave negative lens (3) along an optical axis, the double-convex positive lens (4) is a first compensation lens, the second meniscus positive lens (5) is a second compensation lens, and the out-of-focus image surface caused by the movement of the zoom lens is compensated through the movement of the double-convex positive lens (4) and the second meniscus positive lens (5) along the optical axis, so that clear imaging in the zooming process is realized.
2. The microminiature medium wave refrigeration infrared continuous zoom optical system of claim 1, wherein: the primary image surface is positioned between the second negative meniscus lens (6) and the third positive meniscus lens (7).
3. The microminiature medium wave refrigeration infrared continuous zoom optical system of claim 1, wherein: an aperture diaphragm is arranged at the exit pupil, and the aperture diaphragm is superposed with a cold diaphragm of the infrared detector.
4. The microminiature medium wave refrigeration infrared continuous zoom optical system of claim 1, wherein: the optical material of the first positive meniscus lens (1) is made of a silicon material, the optical material of the first negative meniscus lens (2) is made of a single-crystal germanium material, the optical material of the double-concave negative lens (3) is made of a single-crystal germanium material, the optical material of the double-convex positive lens (4) is made of a silicon material, the optical material of the second positive meniscus lens (5) is made of a zinc selenide material, the optical material of the second negative meniscus lens (6) is made of a single-crystal germanium material, the optical material of the third positive meniscus lens (7) is made of a silicon material, and the optical material of the fourth positive meniscus lens (8) is made of a single-crystal germanium material.
5. The microminiature medium wave refrigeration infrared continuous zoom optical system of claim 1, wherein: the positive lens of first falcate (1), negative lens of first falcate (2), biconcave negative lens (3), biconvex positive lens (4), positive lens of second falcate (5), negative lens of second falcate (6), positive lens of third falcate (7), the focus of positive lens of fourth falcate (8) satisfies the following condition:
3.0f≤f1≤3.2f，-17.0f≤f2≤-16.0f，-0.60f≤f3≤-0.50f，0.95f≤f4≤1.15f，3.2f≤f5≤3.6f，-0.9f≤f6≤-0.7f，0.3f≤f7≤0.5f，1.45f≤f8≤1.65f；
wherein f is the focal length of the optical system in short focus;
f1is the effective focal length of the first meniscus positive lens (1);
f2is the effective focal length of the first negative meniscus lens (2);
f3is the effective focal length of the double concave negative lens (3);
f4is the effective focal length of the biconvex positive lens (4);
f5is the effective focal length of the second meniscus positive lens (5);
f6is the effective focal length of the second negative meniscus lens (6);
f7is the effective focal length of the third meniscus positive lens (7);
f8is the effective focal length of the fourth meniscus positive lens (8).
6. The microminiature medium wave refrigeration infrared continuous zoom optical system of claim 1, wherein: the surface S3 of the first negative meniscus lens (2) facing the object side, the surface S5 of the double-concave negative meniscus lens (3) facing the object side, and the surface S9 of the second positive meniscus lens (5) facing the object side, and the surface S16 of the fourth positive meniscus lens (8) facing the image side all adopt an even aspheric surface, and the surface equation is as follows:
where z is a distance vector from a vertex of the aspheric surface when the aspheric surface is at a position having a height R along the optical axis direction, C is a curvature, C is 1/R, R represents a curvature radius of the lens surface, R is a radial coordinate of the lens surface in a direction perpendicular to the optical axis, k is a conic constant of the lens surface, a is a fourth-order aspheric coefficient of the lens surface, B is a sixth-order aspheric coefficient of the lens surface, and C is an eighth-order aspheric coefficient of the lens surface.
7. The microminiature medium wave refrigeration infrared continuous zoom optical system of claim 1, wherein: the surface S11 of the second negative meniscus lens (6) facing the object side is a diffractive aspheric surface, the aspheric surface and the diffractive surface act on the same lens surface, and the surface equation is as follows:
wherein z is a distance rise from a vertex of the aspheric surface when the aspheric surface is at a position with a height of R along the optical axis direction, C is a curvature, C is 1/R, R represents a curvature radius of the lens surface, R is a radial coordinate of the lens surface in a direction perpendicular to the optical axis, k is a conic constant of the lens surface, a is a fourth-order aspheric coefficient of the lens surface, B is a sixth-order aspheric coefficient of the lens surface, and C is an eighth-order aspheric coefficient of the lens surface; HOR is the diffraction order of the lens surface, C1、C2、C3Is the diffraction coefficient of the lens surface, n is the refractive index of the lens optical material, n0Is the refractive index of air, λ0The center wavelength is designed for the optical system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115166952A (en) * | 2022-08-15 | 2022-10-11 | 苏州东方克洛托光电技术有限公司 | Non-refrigeration type long-wave infrared continuous zoom lens |
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| CN110658613A (en) * | 2019-09-29 | 2020-01-07 | 凯迈（洛阳）测控有限公司 | Miniaturized large-zoom-ratio medium-wave refrigeration infrared continuous zooming optical system |
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| JP2000275522A (en) * | 1999-03-23 | 2000-10-06 | Olympus Optical Co Ltd | Zoom lens |
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