CN110658613A - Miniaturized large-zoom-ratio medium-wave refrigeration infrared continuous zooming optical system - Google Patents

Miniaturized large-zoom-ratio medium-wave refrigeration infrared continuous zooming optical system Download PDF

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CN110658613A
CN110658613A CN201910947518.9A CN201910947518A CN110658613A CN 110658613 A CN110658613 A CN 110658613A CN 201910947518 A CN201910947518 A CN 201910947518A CN 110658613 A CN110658613 A CN 110658613A
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lens
meniscus
facing
negative
group
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吴海清
赵新亮
李同海
崔莉
田海霞
谈大伟
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Kaimai (Luoyang) Measurement and Control Co Ltd
Cama Luoyang Measurement and Control Equipments Co Ltd
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Kaimai (Luoyang) Measurement and Control Co Ltd
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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
    • G02B15/16—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
    • G02B15/163—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 having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—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 having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function

Abstract

A miniaturized medium-wave refrigeration infrared continuous zooming optical system with large zoom ratio adopts positive group mechanical compensation, secondary imaging and continuous zooming design, and reduces the diameter of the optical system; through optical and lens design, on the premise of meeting the imaging quality of the system, the combination of only 9 lenses is obtained, the transmittance is high, the sensitivity of the system is improved, and the total length of the optical system is effectively controlled; the field diaphragm structure is added, so that the influence of stray light on system imaging is reduced, and the signal-to-noise ratio of the system is improved; the cold diaphragm is adopted, the efficiency is realized by 100%, the energy loss of light beams is reduced, the system noise is inhibited, and the system sensitivity and the signal-to-noise ratio are higher; the infrared optical system has the advantages of high imaging quality, small total length, zooming, simple compensation structure, zooming ratio, signal-to-noise ratio and high sensitivity, meets the requirements of an airborne photoelectric pod system with severe requirements on the volume, weight and imaging quality of the optical system, and is at the leading level of domestic similar products.

Description

Miniaturized large-zoom-ratio medium-wave refrigeration infrared continuous zooming optical system
Technical Field
The invention relates to the field of medium wave infrared optical systems of airborne photoelectric equipment, in particular to a miniaturized medium wave refrigeration infrared continuous zooming optical system with a large zoom ratio.
Background
The airborne photoelectric pod system requires that the thermal infrared imager can realize target search of a large field of view and small field of view tracking and identification of a long-distance target, so that an optical system of the thermal infrared imager needs to be designed as a zooming optical system to realize the function;
the target image of the continuous zooming infrared optical system 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 hanging cabin, the system can ensure that a tracking target cannot be lost 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 improved;
particularly, the current airborne photoelectric pod system develops towards high integration level, and the number of loaded photoelectric sensors is increased; the infrared thermal imager and other photoelectric sensors can be loaded with a low-illumination, sunlight and short-wave infrared detailed inspection sensor (Daylight spot SWIR spot), a Laser range finder, a Laser irradiator, a Laser illuminator, a Laser indicator (Laser Pointer), a Laser Marker (Laser Marker), a Laser spot tracker and the like, so that wide-spectrum and multiband target detection is realized.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a miniaturized medium-wave refrigeration infrared continuous zooming optical system with a large zoom ratio, which adopts the positive group mechanical compensation, secondary imaging and continuous zooming design to reduce the diameter of the optical system; through optical and lens design, on the premise of meeting the imaging quality of the system, the combination of only 9 lenses is obtained, so that the optical system has higher transmittance, the sensitivity of the system is improved, and the total length of the optical system is effectively controlled; the cylindrical cam is adopted to control the movement of the zooming group and the compensation group, and the device has the advantage of simple movement control structure; the field diaphragm structure is added, so that the influence of stray light on system imaging is reduced, and the signal-to-noise ratio of the system is improved; the cold diaphragm is adopted, the efficiency is realized by 100%, the energy loss of light beams is reduced, the system noise is inhibited, and the system sensitivity and the signal-to-noise ratio are improved; the continuous zooming infrared optical system has the advantages of high imaging quality, small optical total length, zooming and compensating structure simplicity, zooming ratio, signal-to-noise ratio and high sensitivity.
In order to realize the purpose, the invention adopts the following technical scheme: a miniaturized medium wave refrigeration infrared continuous zooming optical system with large zoom ratio adopts positive mechanical group compensation, secondary imaging and continuous zooming design; the device comprises a front fixed group, a zoom group, a compensation group, a rear fixed group and an infrared detector; the front fixed group comprises a first negative meniscus lens and a first positive meniscus lens; the variable power group comprises a double concave negative lens; the compensation group comprises a second positive meniscus lens and a third positive meniscus lens; the rear fixed group comprises a fourth positive meniscus lens, a second negative meniscus lens, a double-convex positive lens and a fifth positive meniscus lens; the front fixed group, the zoom group, the compensation group and the rear fixed group are 9 optical lenses in total; the front fixed group, the zooming group, the compensation group, the rear fixed group and the infrared detector are sequentially arranged from left to right and arranged in a coaxial way; in the zooming process, the zooming group and the compensation group move along the optical axis, the front fixed group, the rear fixed group and the infrared detector are kept in situ, and the distance between the second meniscus positive lens and the third meniscus positive lens of the compensation group is kept constant.
Furthermore, in the zooming process, the zooming group and the compensation group move along the optical axis according to different motion rules; because the optical focuses of the second meniscus positive lens and the third meniscus positive lens of the compensation group are positive, when the system changes from short focus to long focus, the zoom group and the compensation group approach to the middle; the motion rules of the zoom group and the compensation group are realized by controlling two cylindrical cams; the envelope curves of the two cams are respectively motion law curves of the zoom group and the compensation group;
further, the focal lengths of the above lenses need to satisfy the following conditions:
-6.4f≤f1≤-6.5f，3.1f≤f2≤3.2f，13.0f≤f3≤13.1f，-0.9f≤f4≤-0.8f，-2.1f≤f5≤-2.0f，1.1f≤f6≤1.2f，-12.2f≤f7≤-12.1f，-7.55f≤f8≤-7.45f，3.2f≤f10≤3.3f，0.7f≤f12≤0.8f；
wherein: f is the focal length of the optical system in the short focus,
f1 is the first meniscus negative lens effective focal length,
f2 is the effective focal length of the first meniscus positive lens,
f3 is the effective focal length of the biconcave negative lens,
f4 is the effective focal length of the second meniscus positive lens,
f5 is the effective focal length of the third meniscus positive lens,
f6 is the effective focal length of the fourth meniscus positive lens,
f7 is the second meniscus negative lens effective focal length,
f8 is the effective focal length of a biconvex positive lens,
f9 fifth meniscus positive lens effective focal length.
Furthermore, the light incidence side surfaces of the second meniscus positive lens, the third meniscus positive lens, the fourth meniscus negative lens and the fourth meniscus positive lens are all even aspheric surfaces, and the lens has the advantages of convenience in processing, small phase difference and distortion and clear imaging.
Further, the surface equation of the light incident side of the second meniscus positive lens is as follows:
Figure BDA0002220309450000031
wherein: c. C1The curvature of the surface of the second meniscus positive lens facing the object side, r1Is a second meniscus positiveRadial coordinate, k, of the surface of the lens facing the object side perpendicular to the direction of the optical axis1Is a conic constant of the surface of the second meniscus positive lens facing the object side, A1A fourth-order aspheric coefficient of the surface of the second meniscus positive lens facing the object side, B1A sixth-order aspheric coefficient, C, of the object side surface of the second meniscus positive lens1And the second meniscus positive lens is an eighth-order aspheric coefficient of the surface of the object side.
Further, the surface equation of the light incident side of the third meniscus positive lens is as follows:
Figure BDA0002220309450000032
wherein: c. C2The curvature of the surface of the third meniscus positive lens facing the object side, r2Is a radial coordinate, k, perpendicular to the optical axis of the surface of the third meniscus positive lens facing the object side2Is the conic constant of the surface of the third meniscus positive lens facing the object side, A2A fourth-order aspheric coefficient of the surface of the third meniscus positive lens facing the object side, B2A sixth-order aspheric coefficient C of the object side surface of the third meniscus positive lens2And the third meniscus positive lens is an eighth-order aspheric coefficient of the surface of the object side.
Further, the surface equation of the light incident side of the fourth negative meniscus lens is as follows:
Figure BDA0002220309450000041
wherein, c3The curvature of the surface of the fourth meniscus negative lens on the side facing the object side, r3Is the radial coordinate, k, of the surface of the fourth negative meniscus lens facing the object side perpendicular to the optical axis3Is the conic constant of the surface of the fourth meniscus negative lens on the side facing the object, A3Fourth order aspherical surface coefficient of the surface of the fourth meniscus negative lens facing the object side, B3Of surfaces on the object side of the fourth negative meniscus lensSixth order aspherical surface coefficient, C3And the fourth meniscus negative lens is an eighth-order aspheric coefficient of the surface of the object side.
Further, the surface equation of the light incident side of the fourth meniscus positive lens is as follows:
Figure BDA0002220309450000042
wherein, c4The curvature of the surface of the fourth meniscus positive lens facing the object side, r4Is the radial coordinate, k, of the surface of the fourth meniscus positive lens facing the object side in the direction perpendicular to the optical axis4Is the conic constant of the surface of the fourth meniscus positive lens facing the object side, A4A fourth-order aspheric coefficient of the surface of the fourth meniscus positive lens facing the object side, B4A sixth-order aspheric coefficient C of the object side surface of the fourth meniscus positive lens4And the fourth meniscus positive lens is an eighth-order aspheric coefficient of the surface of the object side.
Furthermore, the light-emitting side surface of the fifth meniscus positive lens adopts a diffractive aspheric surface, and a diffraction grating is arranged on the aspheric surface, so that the imaging quality of the optical system is further improved; the surface equation is as follows:
Figure BDA0002220309450000043
wherein c is5The curvature of the image side surface of the fifth meniscus positive lens, r5Is a radial coordinate, k, of the fifth meniscus positive lens facing the image side surface in a direction perpendicular to the optical axis5Is a conic constant of the image side surface of the fifth meniscus positive lens, A5Fourth order aspheric coefficient of the image side surface of the fifth meniscus positive lens, B5A sixth-order aspheric coefficient, C, of the image side surface of the fifth meniscus positive lens5An eighth-order aspheric coefficient of the surface of the fifth meniscus positive lens on the image side; HOR is the diffraction order of the surface of the fifth meniscus positive lens facing the image side, C1、C2The diffraction coefficient of the surface of the fifth meniscus positive lens facing the image side, n is the refractive index of the optical material of the fifth meniscus positive lens, n0Is the refractive index of air, λ0The center wavelength is designed for the optical system.
Further, the system is provided with a field diaphragm and an aperture diaphragm; the field diaphragm is arranged on the image plane of the optical field diaphragm and used for blocking stray light outside the field; the aperture diaphragm is a cold diaphragm, the efficiency of the cold diaphragm is 100%, the aperture diaphragm is arranged between the fifth meniscus positive lens of the fixed group and the infrared detector, and the aperture diaphragm determines the aperture of the optical system and is used for eliminating the noise of the optical system.
Due to the adoption of the technical scheme, the invention has the following beneficial effects: the invention discloses a miniaturized medium wave refrigeration infrared continuous zooming optical system with large zoom ratio, which adopts positive group mechanical compensation, secondary imaging and continuous zooming design, thereby reducing the diameter of the optical system; through optical and lens design, on the premise of meeting the imaging quality of the system, the combination of only 9 lenses is obtained, so that the optical system has higher transmittance, the sensitivity of the system is improved, and the total length of the optical system is effectively controlled; the cylindrical cam is adopted to control the movement of the zooming group and the compensation group, and the compensation structure has the advantage of simple compensation structure; the field diaphragm structure is added, so that the influence of stray light on system imaging is reduced, and the signal-to-noise ratio of the system is improved; the cold diaphragm is adopted, the efficiency is realized by 100 percent, the energy loss of light beams is reduced, and the system sensitivity is improved; the continuous zooming infrared optical system is miniaturized, has the advantages of high imaging quality, zooming, simple compensation structure, zooming ratio, signal-to-noise ratio and high sensitivity, meets the requirements of an airborne photoelectric pod system with severe requirements on the volume, weight and imaging quality of the optical system, and is at the leading level of domestic similar products.
Drawings
FIG. 1 is a diagram of an optical path of the optical system with a focal length of 15 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 300 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 diagram showing the relationship between the phase period and the radial distance of the diffraction element of the optical system.
In the figure: a first negative meniscus lens; 2. a first meniscus positive lens; 3. a biconcave negative lens; 4. a second meniscus positive lens; 5. a third meniscus positive lens; 6. a fourth meniscus positive lens; 7. a second negative meniscus lens; 8. a biconvex positive lens; 9. a fifth meniscus positive lens; 10. an infrared detector.
Detailed Description
The present invention will be explained in detail by the following examples, which are disclosed for the purpose of protecting all technical improvements within the scope of the present invention.
A miniaturized medium wave refrigeration infrared continuous zooming optical system with large zoom ratio adopts positive mechanical group compensation, secondary imaging and continuous zooming design; comprises a front fixed group, a zoom group, a compensation group, a rear fixed group and an infrared detector 10; the front fixed group comprises a first negative meniscus lens 1 and a first positive meniscus lens 2; the variable power group comprises a double concave negative lens 3; the compensation group comprises a second positive meniscus lens 4 and a third positive meniscus lens 5; the rear fixed group comprises a fourth positive meniscus lens 6, a second negative meniscus lens 7, a double convex positive lens 8 and a fifth positive meniscus lens 9; the front fixed group, the zoom group, the compensation group and the rear fixed group are totally 9 optical lenses; the front fixed group, the zooming group, the compensation group, the rear fixed group and the infrared detector 10 are sequentially arranged from left to right and arranged in a coaxial manner; in the zooming process, the zooming group and the compensation group move along the optical axis, the front fixed group, the rear fixed group and the infrared detector 10 keep in situ, and the distance between the second meniscus positive lens 4 and the third meniscus positive lens 5 of the compensation group keeps constant; the system is also provided with a field diaphragm and an aperture diaphragm; the field diaphragm is arranged at the image plane of the optical field diaphragm; the aperture diaphragm is a cold wave, and the aperture diaphragm is arranged between the fifth meniscus positive lens 9 of the fixed group and the infrared detector 10.
In the zooming process, the zooming group and the compensation group move along the optical axis according to different motion rules, and the motion rules are realized through the control of two cylindrical cams; the envelope curves of the two cylindrical cams are respectively motion law curves of the zoom group and the compensation group;
the focal lengths of the above lenses need to satisfy the following conditions:
-17.5f≤f1≤-17.3f，3.1f≤f2≤3.4f，13.-0.72f≤f3≤-0.67f，2.0f≤f4≤2.2f，3.85f≤f5≤4.0f，0.9f≤f6≤1.0f，-0.5f≤f7≤-0.4f，-1.0f≤f8≤1.2f，1.05f≤f9≤1.2f；
wherein: f is the focal length of the optical system in the short focus,
f1 is the effective focal length of the first negative meniscus lens 1,
f2 is the effective focal length of the first positive meniscus lens 2,
f3 is the effective focal length of the biconcave negative lens 3,
f4 is the effective focal length of the second positive meniscus lens 4,
f5 is the effective focal length of the third positive meniscus lens 5,
f6 is the effective focal length of the fourth positive meniscus lens 6,
f7 is the effective focal length of the second negative meniscus lens 7,
f8 is the effective focal length of the biconvex positive lens 8,
f9 effective focal length of fifth meniscus positive lens 9;
the light incidence side surfaces of the first negative meniscus lens 1, the double-concave negative lens 3 and the second negative meniscus lens 7 are all of even-order aspheric surface shapes;
the surface equation of the light incident side of the first meniscus negative lens 1 is as follows:
Figure BDA0002220309450000071
wherein: c. C1The curvature of the surface of the first negative meniscus lens 1 on the side facing the object, r1Is a radial coordinate, k, perpendicular to the optical axis of the object-side surface of the first negative meniscus lens 11Is a conic constant of the surface of the first meniscus negative lens 1 on the side facing the object, A1A fourth-order aspheric coefficient B of the surface of the first meniscus negative lens 1 facing the object1A sixth-order aspheric coefficient C of the object side surface of the first negative meniscus lens 11An eighth-order aspheric coefficient of the surface of the first negative meniscus lens 1 facing the object side;
the surface equation of the light incident side of the biconcave negative lens 3 is as follows:
Figure BDA0002220309450000081
wherein, c3The curvature of the surface of the biconcave negative lens 3 facing the object side, r3The radial coordinate, k, of the surface of the biconcave negative lens 3 facing the object side perpendicular to the optical axis direction3Is the conic constant of the surface of the biconcave negative lens 3 on the side facing the object, A3Fourth order aspherical surface coefficient of the surface of the biconcave negative lens 3 facing the object side, B3A sixth-order aspherical surface coefficient, C, of the surface of the biconcave negative lens 3 facing the object side3An eighth order aspherical surface coefficient which is a surface of the biconcave negative lens 3 on the side facing the object;
the surface equation of the light incident side of the second negative meniscus lens 7 is as follows:
Figure BDA0002220309450000082
wherein, c7The curvature of the surface of the second meniscus negative lens 7 on the side facing the object side, r7Is a radial coordinate, k, perpendicular to the optical axis direction of the surface of the second negative meniscus lens 7 on the side facing the object7Is the conic constant of the surface of the second meniscus negative lens 7 on the side facing the object, A7A fourth-order aspheric coefficient of the surface of the second meniscus negative lens 7 facing the object side, B7A sixth-order aspherical surface coefficient, C, of the surface of the second meniscus negative lens 7 facing the object side7An eighth-order aspherical surface coefficient which is a surface of the second meniscus negative lens 7 on the object side;
the light-emitting side surface of the fifth meniscus positive lens 9 adopts a diffractive aspheric surface shape, a diffraction grating is arranged on the aspheric surface, and the surface equation is as follows:
Figure BDA0002220309450000083
wherein c is9Is the curvature of the light-emitting side surface of the fifth meniscus positive lens 9, r9Is a radial coordinate, k, of the light-emitting side surface of the fifth meniscus positive lens 9 in the direction perpendicular to the optical axis9Is a conic constant of the light-exit side surface of the fifth meniscus positive lens 9, A9Fourth order aspherical surface coefficient of the light-emitting side surface of the fifth meniscus positive lens 9, B9A sixth-order aspheric coefficient of the light-exit side surface of the fifth meniscus positive lens 9; c9An eighth-order aspheric coefficient of the light-exit side surface of the fifth meniscus positive lens 9; HOR is the diffraction order of the light-exiting side surface of the fifth meniscus positive lens 9, C1、C2Is the diffraction coefficient of the light-emitting side surface of the fifth positive meniscus lens 9, n is the refractive index of the optical material of the fifth positive meniscus lens, n0Is the refractive index of air, λ0The center wavelength is designed for the optical system.
Based on the technical characteristics of the miniaturized medium-wave refrigeration infrared continuous zooming optical system with large zoom ratio, such as the configuration of each optical lens and device, the design of optical path, the focal length of each optical lens, the design rule of each lens surface and the like, the following preferred specific embodiments are provided by combining the specific technical indexes realized by the system:
the specific technical indexes are as follows:
adapting the detector: 640 x 512, 15 μm medium wave refrigeration 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 of the total weight of the rubber,
visual field: 35.5 DEG X28.7-1.83 DEG X1.47 DEG,
total optical length (TTL): is less than or equal to 170mm,
TTL (total optical length)/fmax (longest focal length): less than or equal to 0.57;
table 1 lists detailed data of embodiments of the optical system according to the present invention including the face type, radius of curvature, thickness, caliber, material of each lens at focal lengths of 15mm to 300 mm. The unit of the curvature radius, the thickness and the 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 surface of the lens and an optical axis;
Figure BDA0002220309450000091
TABLE 1
Table 2 shows the aspherical surface coefficients of the light-incident side surface of the first negative meniscus lens 1 according to the invention, which are expressed by scientific notation, for example-3.3624206 e-008 for-3.362420610-8;
Figure BDA0002220309450000102
TABLE 2
Table 3 lists the aspherical coefficients of the light-incident side surface of the biconcave negative lens 3 according to the present invention;
TABLE 3
Table 4 lists the aspherical coefficients of the light-incident-side surface of the second negative meniscus lens 7 according to the present invention;
Figure BDA0002220309450000104
Figure BDA0002220309450000111
TABLE 4
Table 5 lists the diffractive aspheric coefficients of the light-entering side of the fifth positive meniscus lens 9 according to the invention.
Figure BDA0002220309450000112
TABLE 5
Table 6 diffractive aspherical surface coefficients of the light emitting side of the fifth meniscus positive lens 12 according to the present invention.
Figure BDA0002220309450000113
TABLE 6
Through simulation of optical design software, 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 of 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 1% in the state of focal length 300mm and 160mm, and less than 5% in the state of 15mm, which satisfies the application requirements.
When the miniaturized medium-wave refrigeration infrared continuous zooming optical system with large zoom ratio works, the specific light transmission process is as follows: light rays emitted by natural light reflected by an object plane are scattered by the first negative meniscus lens 1 and then reach the first positive meniscus lens 2, are converged by the first positive meniscus lens 2 and then reach the double-concave negative lens 3, are scattered by the double-concave negative lens 3 and then reach the second positive meniscus lens 4, are converged by the second positive meniscus lens 4 and then reach the third positive meniscus lens 5, are converged by the third positive meniscus lens 5 and then reach the fourth positive meniscus lens 6, are converged by the fourth positive meniscus lens 6 and then reach the second negative meniscus lens 7, are scattered by the second negative meniscus lens 7 and then reach the double-convex positive lens 8, are converged by the double-convex positive lens 8 and then reach the fifth positive meniscus lens 9, and are converged by the fifth positive meniscus positive lens 9 and then are imaged on the infrared detector 10.
When the miniaturized medium-wave refrigeration infrared continuous zooming optical system with large zoom ratio works, the motion laws of the zoom group and the compensation group are as follows: when the optical system is in short focus, the zoom group is at the position close to the object space, and the compensation group is at the position close to the image space; in the process of changing from short focus to long focus, the zoom group and the compensation lens gradually approach from two ends to the middle along the optical axis; the focal length change is realized by the movement of the zoom group along the optical axis, and the image plane defocusing caused by the movement of the zoom group is compensated by the movement of the compensation group along the optical axis, so that the clear imaging of the whole zooming process is realized.
The present invention is not described in detail in the prior art.

Claims (9)

1. A miniaturized medium wave refrigeration infrared continuous zooming optical system with large zoom ratio is characterized in that: the system adopts positive mechanical group compensation, secondary imaging and continuous zooming design; comprises a front fixed group, a zoom group, a compensation group, a rear fixed group and an infrared detector (10); the front fixed group comprises a first negative meniscus lens (1) and a first positive meniscus lens (2); the variable power group comprises a double concave negative lens (3); the compensation group comprises a second positive meniscus lens (4) and a third positive meniscus lens (5); the rear fixed group comprises a fourth positive meniscus lens (6), a second negative meniscus lens (7), a double convex positive lens (8) and a fifth positive meniscus lens (9); the front fixed group, the zoom group, the compensation group and the rear fixed group are 9 optical lenses in total; the front fixed group, the zooming group, the compensation group, the rear fixed group and the infrared detector (10) are sequentially arranged from left to right and arranged in a coaxial way; in the zooming process, the zooming group and the compensation group move along the optical axis, the front fixed group, the rear fixed group and the infrared detector (10) keep in situ, and the distances between the second meniscus positive lens (4) and the third meniscus positive lens (5) of the compensation group keep constant.
2. The miniaturized high-zoom-ratio medium-wave refrigeration infrared continuous zoom optical system as set forth in claim 1, wherein: in the zooming process, the zooming group and the compensation group move along the optical axis according to different motion rules, and the motion rules are realized through the control of two cams; the envelope curves of the two cams are respectively the motion law curves of the zoom group and the compensation group.
3. The miniaturized high-zoom-ratio medium-wave refrigeration infrared continuous zoom optical system as set forth in claim 1, wherein: the focal lengths of the above lenses need to satisfy the following conditions:
-17.5f≤f1≤-17.3f，3.1f≤f2≤3.4f，13.-0.72f≤f3≤-0.67f，2.0f≤f4≤2.2f，3.85f≤f5≤4.0f，0.9f≤f6≤1.0f，-0.5f≤f7≤-0.4f，-1.0f≤f8≤1.2f，1.05f≤f9≤1.2f；
wherein: f is the focal length of the optical system in the short focus,
f1 is the effective focal length of the first negative meniscus lens (1),
f2 is the effective focal length of the first meniscus positive lens (2),
f3 is the effective focal length of the double concave negative lens (3),
f4 is the effective focal length of the second meniscus positive lens (4),
f5 is the effective focal length of the third meniscus positive lens (5),
f6 is the effective focal length of the fourth meniscus positive lens (6),
f7 is the effective focal length of the second meniscus negative lens (7),
f8 is the effective focal length of the biconvex positive lens (8),
f9 effective focal length of fifth meniscus positive lens (9).
4. The miniaturized high-zoom-ratio medium-wave refrigeration infrared continuous zoom optical system as set forth in claim 1, wherein: the light incidence side surfaces of the first negative meniscus lens (1), the double-concave negative lens (3) and the second negative meniscus lens (7) are all even aspheric surface types.
5. The miniaturized high zoom ratio medium wave refrigeration infrared continuous zoom optical system of claim 4, which is characterized in that: the surface equation of the light incident side of the first meniscus negative lens (1) is as follows:
Figure FDA0002220309440000021
wherein: c. C1Is the curvature of the surface of the first negative meniscus lens (1) facing the object side, r1Is a radial coordinate, k, of the first negative meniscus lens (1) facing the object side surface perpendicular to the optical axis1Is the conic constant of the surface of the first negative meniscus lens (1) facing the object space, A1A fourth-order aspheric coefficient B of the surface of the first negative meniscus lens (1) facing the object1A sixth-order aspheric coefficient C of the surface of the first negative meniscus lens (1) facing the object1The aspheric coefficient of the eighth order of the surface of the first meniscus negative lens (1) facing the object side.
6. The miniaturized high zoom ratio medium wave refrigeration infrared continuous zoom optical system of claim 4, which is characterized in that: the surface type equation of the incident side of the double concave negative lens (3) is as follows:
Figure FDA0002220309440000022
wherein, c3Is the curvature of the surface of the biconcave negative lens (3) facing the object side, r3Is a radial coordinate, k, perpendicular to the optical axis direction of the surface of the biconcave negative lens (3) on the side facing the object space3Is the conic constant of the surface of the biconcave negative lens (3) facing the object side, A3A fourth-order aspheric coefficient of the surface of the biconcave negative lens (3) facing the object side, B3Is a double concaveA sixth-order aspherical surface coefficient C of the surface of the negative lens (3) facing the object side3The aspheric coefficient of the eighth order of the surface of the biconcave negative lens (3) facing to the object side.
7. The miniaturized high zoom ratio medium wave refrigeration infrared continuous zoom optical system of claim 4, which is characterized in that: the surface equation of the incident side of the second meniscus negative lens (7) is as follows:
Figure FDA0002220309440000031
wherein, c7Is the curvature of the surface of the second negative meniscus lens (7) facing the object side, r7Is a radial coordinate, k, perpendicular to the optical axis of the surface of the second negative meniscus lens (7) facing the object7Is the conic constant of the surface of the second negative meniscus lens (7) facing the object side, A7A fourth-order aspheric coefficient of the surface of the second negative meniscus lens (7) facing the object side, B7A sixth-order aspheric coefficient C of the surface of the second negative meniscus lens (7) facing the object side7Is an eighth-order aspheric coefficient of the surface of the second meniscus negative lens (7) facing the object side.
8. The miniaturized high-zoom-ratio medium-wave refrigeration infrared continuous zoom optical system as set forth in claim 1, wherein: the light-emitting side surface of the fifth meniscus positive lens (9) adopts a diffractive aspheric surface shape, a diffraction grating is arranged on the aspheric surface, and the surface equation is as follows:
Figure FDA0002220309440000032
wherein c is9The curvature of the surface of the fifth meniscus positive lens (9) facing the image side, r9Is a radial coordinate, k, perpendicular to the optical axis of the image side surface of the fifth meniscus positive lens (9)9Is a conic constant of the image side surface of the fifth meniscus positive lens (9), A9Is a fifth oneFourth order aspherical surface coefficient B of the image side surface of the meniscus positive lens (9)9A sixth-order aspheric coefficient C of the image side surface of the fifth meniscus positive lens (9)9An eighth-order aspheric coefficient of the surface of the fifth meniscus positive lens (9) on the image side; HOR is the diffraction order of the surface of the fifth meniscus positive lens (9) facing the image side, C1、C2The diffraction coefficient of the surface of the fifth positive meniscus lens (9) facing the image side, n is the refractive index of the optical material of the fifth positive meniscus lens, n0Is the refractive index of air, λ0The center wavelength is designed for the optical system.
9. The miniaturized high-zoom-ratio medium-wave refrigeration infrared continuous zoom optical system as set forth in claim 1, wherein: the system is provided with a field diaphragm and an aperture diaphragm; the field diaphragm is arranged at the image plane of the optical field diaphragm; the aperture diaphragm is a cold wave, and the aperture diaphragm is arranged between the fifth meniscus positive lens (9) of the fixed group and the infrared detector (10).
CN201910947518.9A 2019-09-29 2019-09-29 Miniaturized large-zoom-ratio medium-wave refrigeration infrared continuous zooming optical system Withdrawn CN110658613A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111505801A (en) * 2020-05-18 2020-08-07 吉林工程技术师范学院 Medium wave infrared optical system
CN112180571A (en) * 2020-09-30 2021-01-05 中国科学院西安光学精密机械研究所 Common-aperture infrared dual-waveband dual-field-of-view optical system
CN114460728A (en) * 2022-01-25 2022-05-10 凯迈（洛阳）测控有限公司 Microminiature medium wave refrigeration infrared continuous zooming optical system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111505801A (en) * 2020-05-18 2020-08-07 吉林工程技术师范学院 Medium wave infrared optical system
CN111505801B (en) * 2020-05-18 2021-09-14 吉林工程技术师范学院 Medium wave infrared optical system
CN112180571A (en) * 2020-09-30 2021-01-05 中国科学院西安光学精密机械研究所 Common-aperture infrared dual-waveband dual-field-of-view optical system
CN112180571B (en) * 2020-09-30 2021-08-17 中国科学院西安光学精密机械研究所 Common-aperture infrared dual-waveband dual-field-of-view optical system
CN114460728A (en) * 2022-01-25 2022-05-10 凯迈（洛阳）测控有限公司 Microminiature medium wave refrigeration infrared continuous zooming optical system
CN114460728B (en) * 2022-01-25 2023-06-23 凯迈（洛阳）测控有限公司 Microminiature medium wave refrigerating infrared continuous zooming optical system

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