CN114460730A - Ultra-small airborne medium wave refrigeration infrared continuous zooming optical system - Google Patents
Ultra-small airborne medium wave refrigeration infrared continuous zooming optical system Download PDFInfo
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- CN114460730A CN114460730A CN202210096790.2A CN202210096790A CN114460730A CN 114460730 A CN114460730 A CN 114460730A CN 202210096790 A CN202210096790 A CN 202210096790A CN 114460730 A CN114460730 A CN 114460730A
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- 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 microminiaturized airborne 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 biconcave negative lens, a first biconvex positive lens, a second negative meniscus lens, a second positive meniscus lens, a third biconvex positive lens and an infrared detector which are arranged along the same optical axis in sequence from an object space to an image space; the first positive meniscus lens, the first negative meniscus lens and the second negative meniscus lens are all arranged in a bent manner towards the image side; the second meniscus positive lens is arranged in a bent way towards the object space; the total length from the front surface of the first positive meniscus lens to the image surface of the optical system is 100mm, the total optical length is small, and the small-sized airborne photoelectric pod system is suitable for small-sized airborne photoelectric pod systems with strict requirements on the volume and the weight of the optical system.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a microminiaturized airborne medium wave refrigeration infrared continuous zooming optical system.
Background
The small unmanned aerial vehicle has the outstanding characteristics of low cost, good safety, light weight, small volume, flexibility, maneuverability and the like, has the capabilities of turning over mountains and crossing mountains and bypassing street corners to carry out close-range combat, and is suitable for being used in urban environments with dense population in regional conflict and anti-terrorism combat; at present, a small unmanned aerial vehicle carries a micro photoelectric pod and utilizes an infrared imaging system loaded by the small unmanned aerial vehicle to complete all-weather reconnaissance, aerial photography and other tasks, can perform reconnaissance, warning and searching actions for ground troops, provides information in real time, and is widely applied to the field of military and civilian;
the airborne photoelectric/infrared load is the most common basic task execution unit of the small unmanned aerial vehicle, and has the characteristics of small volume and light weight, and by means of a weak light charge coupled device camera, a thermal imager, an infrared sensor or a forward-looking infrared system, the unmanned aerial vehicle can take pictures at day and night and under severe weather conditions and can convert the pictures into digital signals, and the digital signals are transmitted to the ground in time through a data link to complete the tasks of monitoring, target capturing and the like, so that the unmanned aerial vehicle can passively work and is not easy to find;
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 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 effect is greatly improved;
however, the airborne photoelectric pod system is high in integration level, and multiple photoelectric sensors are loaded inside the airborne photoelectric pod system and used for realizing wide-spectrum and multiband target detection; because the weight of the micro unmanned aerial vehicle carrying the photoelectric pod is an important factor influencing the endurance, the size and the weight of an airborne photoelectric system are limited, and the miniaturization design of a thermal infrared imager and other photoelectric sensors is important; therefore, the design of a miniaturized infrared imaging system is of great significance; however, the existing infrared continuous zooming optical system generally has the defects of extremely large volume and heavy weight, which is a problem to be solved by those skilled in the art.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a microminiaturized airborne medium wave refrigeration infrared continuous zooming optical system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a microminiaturized airborne medium wave refrigeration infrared continuous zooming optical system comprises a first positive meniscus lens, a first negative meniscus lens, a biconcave negative lens, a first biconvex positive lens, a second negative meniscus lens, a second positive meniscus lens, a third biconvex positive 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 and the second negative meniscus lens are all arranged in a bent manner towards the image side; the second meniscus positive lens is arranged in a bent way towards the object space;
the double-concave negative lens is a zoom lens, the focal length change is realized by the movement of the double-concave negative lens along the optical axis, the double-concave negative lens is far away from the first meniscus negative lens from left to right in the change process from the short focal length of 20mm to the long focal length of 200mm, the first double-convex positive lens is a first compensation lens, the second double-convex 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 first double-convex positive lens and the second double-convex positive lens along the optical axis, so that the clear imaging in the zooming process is realized, and the first double-convex positive lens and the second double-convex positive lens are close to the first meniscus negative lens from right to left in the change process from the short focal length of 20mm to the long focal length of 200 mm; the first positive meniscus lens, the first negative meniscus lens, the second positive meniscus lens and the third double convex positive lens are fixed lenses and keep in-situ in the zooming process.
Preferably, the focal lengths of the first positive meniscus lens, the first negative meniscus lens, the biconcave negative lens, the first biconvex positive lens, the second negative meniscus lens, the second positive meniscus lens and the third biconvex positive lens satisfy the following conditions:
1.7f≤f1≤1.9f，-13.5f≤f2≤-12.0f，-0.30f≤f3≤-0.20f，0.40f≤f4≤0.50f，0.60f≤f5≤0.75f，-0.30f≤f6≤-0.20f，0.3f≤f7≤0.5f，0.30f≤f8≤0.50f；
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 a biconcave negative osmosisThe effective focal length of the mirror;
f4is the effective focal length of the first biconvex positive lens;
f5is the effective focal length of the second biconvex positive lens;
f6is the effective focal length of the second negative meniscus lens;
f7is the effective focal length of the second meniscus positive lens;
f8is the effective focal length of the third biconvex positive lens.
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 second positive meniscus lens.
Preferably, the optical material of the first positive meniscus lens is a single-crystal germanium material, the optical material of the first negative meniscus lens is a silicon material, the optical material of the double-concave negative lens is a single-crystal germanium material, the optical material of the first double-convex positive lens is a silicon material, the optical material of the second double-convex positive lens is a single-crystal germanium material, the optical material of the second negative meniscus lens is a zinc selenide material, the optical material of the second positive meniscus lens is a silicon material, and the optical material of the third double-convex positive lens is a single-crystal germanium material.
Preferably, the surface S1 of the first positive meniscus lens facing the object, the surface S5 of the double-concave negative meniscus lens facing the object, and the surface S11 of the second negative meniscus lens facing the object, and the surface S8 of the first double-convex positive 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 S16 of the third biconvex positive lens facing the image side 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 microminiaturized airborne medium wave refrigeration infrared continuous zooming optical system, which realizes a 10-time continuous zooming optical system with the length of 20-200 mm, a zoom group adopts a germanium lens with high refractive index and focal power, the zoom stroke is effectively shortened, the total optical length of the continuous zooming optical system is 100mm, the ratio of the total length to the maximum focal length is 0.5, the total optical length of the system is small, and the system is suitable for a small airborne photoelectric pod system with severe requirements on the volume and the weight of the optical system; in addition, the zooming curve of the optical system is smooth and continuous, and has no abrupt change point, so that the clamping stagnation phenomenon of the system in the zooming process can be effectively avoided.
Drawings
FIG. 1 is a diagram of the optical path of the optical system of the present invention with a focal length of 200 mm;
FIG. 2 is a diagram of the optical path of the optical system of the present invention with a focal length of 100 mm;
FIG. 3 is a diagram of the optical path of the optical system of the present invention with a focal length of 20 mm;
FIG. 4 is a diagram of the transfer function for an optical system of the present invention with a focal length of 200 mm;
FIG. 5 is a graph of the transfer function for an optical system of the present invention having a focal length of 100 mm;
FIG. 6 is a graph of the transfer function for an optical system of the present invention having a focal length of 20 mm;
FIG. 7 is a dot arrangement diagram of the focal length of the optical system of the present invention at 200 mm;
FIG. 8 is a dot arrangement diagram of an optical system of the present invention having a focal length of 100 mm;
FIG. 9 is a dot arrangement diagram of an optical system of the present invention having a focal length of 20 mm;
FIG. 10 is a graph of field curvature and distortion for a focal length of 200mm for an optical system of the present invention;
FIG. 11 is a graph of field curvature and distortion for a focal length of 100mm for an optical system of the present invention;
FIG. 12 is a graph of field curvature and distortion for a focal length of 20mm for an optical system of the present invention;
FIG. 13 is a zoom plot of an optical system of the present invention;
FIG. 14 shows parameters of an infrared detector (wherein F#(F number of the optical system) is F/D, F is the focal length of the optical system, and D is the diameter of the entrance pupil);
FIG. 15 shows parameters of lenses of an optical system of the present invention;
FIG. 16 shows the aspheric coefficients of S1, S5, S11 and S8 in accordance with the present invention;
FIG. 17 shows the diffractive aspheric coefficients of S16 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 first biconvex positive lens; 5. a second biconvex positive lens; 6. a second negative meniscus lens; 7. a second meniscus positive lens; 8. a third biconvex 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 subminiature airborne 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 is the direction, two surfaces of a lens are an incident surface and an emergent surface in sequence, and the subminiature airborne medium wave refrigeration infrared continuous zooming optical system comprises a first positive meniscus lens 1, a first negative meniscus lens 2, a biconcave negative lens 3, a first double convex positive lens 4, a second double convex positive lens 5, a second negative meniscus lens 6, a second positive meniscus lens 7, a third double convex positive lens 8 and an infrared detector 9 which are arranged along the same optical axis in sequence from the object space to the image space; according to the requirement, the focal lengths of the first positive meniscus lens 1, the first negative meniscus lens 2, the double-concave negative lens 3, the first double-convex positive lens 4, the second double-convex positive lens 5, the second negative meniscus lens 6, the second positive meniscus lens 7 and the third double-convex positive lens 8 satisfy the following conditions:
1.7f≤f1≤1.9f，-13.5f≤f2≤-12.0f，-0.30f≤f3≤-0.20f，0.40f≤f4≤0.50f，0.60f≤f5≤0.75f，-0.30f≤f6≤-0.20f，0.3f≤f7≤0.5f，0.30f≤f8≤0.50f；
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;
f4is the effective focal length of the first biconvex positive lens 4;
f5is the effective focal length of the second biconvex positive lens 5;
f6is the effective focal length of the second negative meniscus lens 6;
f7is the effective focal length of the second positive meniscus lens 7;
f8is the effective focal length of the third biconvex positive lens 8;
the surface S1 of the first meniscus positive lens 1 facing the object side, the surface S5 of the biconcave negative lens 3 facing the object side, and the surface S11 of the second meniscus negative lens 6 facing the object side, and the surface S8 of the first biconvex positive lens 4 facing the image side all adopt an even aspheric 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;
the surface S16 of the third biconvex positive lens 8 facing the image 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;
the first positive meniscus lens 1, the first negative meniscus lens 2 and the second negative meniscus lens 6 are all arranged in a bent manner towards the image; the second meniscus positive lens 7 is arranged in a bent manner towards the object;
as shown in fig. 13, in order to provide a zoom profile of the continuous zoom optical system of the present invention, the biconcave negative lens 3 is a zoom lens, the focal length is varied by the biconcave negative lens 3 moving along the optical axis independently in a predetermined relationship, the biconcave negative lens 3 moves away from the first negative meniscus lens 2 from left to right in the variation process from the short focus of 20mm to the long focus of 200mm, the first biconvex positive lens 4 is a first compensation lens, the second biconvex positive lens 5 is a second compensation lens, the defocusing of the image plane caused by the movement of the zoom lens is compensated by the movement of the first biconvex positive lens 4 and the second biconvex positive lens 5 along the optical axis independently, the first biconvex positive lens 4 and the second biconvex positive lens 5 both move toward the first negative meniscus lens 2 from right to left in the variation process from the short focus of 20mm to the long focus of 200mm, thereby achieving clear imaging in the zoom process, the stroke of the biconcave negative lens 3 is 13.1mm, the stroke of the first double convex positive lens 4 is 3.5mm, and the stroke of the second double convex positive lens 5 is 2.95 mm; the first positive meniscus lens 1, the first negative meniscus lens 2, the second negative meniscus lens 6, the second positive meniscus lens 7 and the third double convex positive lens 8 are fixed lenses and keep in-situ during zooming; as can be seen from fig. 13, the zooming curve of the optical system of the present invention is smooth and continuous, and has no discontinuities, so that the occurrence of the jamming phenomenon during zooming can be effectively avoided; according to the requirements, the optical material of the first negative meniscus lens 2 is a silicon material, the optical material of the double-concave negative lens 3 is a single-crystal germanium material, the optical material of the first double-convex positive lens 4 is a silicon material, the optical material of the second double-convex positive lens 5 is a single-crystal germanium material, the optical material of the second negative meniscus lens 6 is a zinc selenide material, the optical material of the second positive meniscus lens 7 is a silicon material, and the optical material of the third double-convex positive lens 8 is a single-crystal germanium material;
in specific optical path transmission, light rays emitted by infrared radiation of an external scene reach a first negative meniscus lens 2 after being converged by a first positive meniscus lens 1, reach a biconcave negative lens 3 after being diverged by the first negative meniscus lens 2, reach a first biconvex positive lens 4 after being diverged by the biconcave negative lens 3, reach a second biconvex positive lens 5 after being converged by the first biconvex positive lens 4, reach a second negative meniscus lens 6 after being converged by the second biconvex positive lens 5, reach a second positive meniscus lens 7 after being diverged by the second negative meniscus lens 6, reach a third biconvex positive lens 8 after being converged by the second positive meniscus lens 7, and form an image on an infrared detector 9 after being converged by the third biconvex positive lens 8; the primary image surface is positioned between the second negative meniscus lens 6 and the second 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; the exit pupil is provided with the aperture diaphragm, and the aperture diaphragm is superposed with the 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.
The first embodiment is as follows:
the specific technical index of the optical system of the present invention is shown in fig. 14;
as shown in fig. 15, the detailed data of each lens (including the surface type, the curvature radius, the thickness, the aperture and the material of each lens, wherein the unit of the curvature radius, the thickness and the aperture of each 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 in this embodiment is 20mm to 200 mm;
as shown in fig. 16, in the present embodiment, the aspheric coefficients of the surface S1 of the first meniscus positive lens 1 facing the object side, the surface S5 of the biconcave negative lens 3 facing the object side, the surface S11 of the second meniscus negative lens 6 facing the object side, and the surface S8 of the first biconvex positive lens 4 facing the image side (shown by scientific notation, for example-3.284985 e-007-3.284985 × 10-7)；
As shown in fig. 17 (shown by scientific notation in the figure), the diffractive aspheric coefficient of the surface S16 on the image side of the third biconvex positive lens 8 in the present embodiment;
simulation by optical design software:
as shown in fig. 4, 5 and 6, when the characteristic frequency of the infrared detector is 33lp/mm, the transfer functions of the optical system of the invention are close to 0.2 in the states of 200mm, 100mm and 20mm focal length;
as shown in fig. 7, 8 and 9, the focal lengths of the optical system of the invention are 200mm, 100mm and 20mm, 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 2% in the state of the focal length of 200mm and 100mm, and less than 4% in the state of 20mm, which satisfies the application requirements.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes 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 to be construed as limiting the claims.
Claims (7)
1. A microminiaturized airborne 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 first double-convex positive lens (4), a second double-convex positive lens (5), a second negative meniscus lens (6), a second positive meniscus lens (7), a third double-convex positive 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) and the second negative meniscus lens (6) are all arranged in a bent manner towards the image; the second meniscus positive lens (7) is arranged in a bent manner towards the object side;
the double-concave negative lens (3) is a zoom lens, focal length change is realized by moving the double-concave negative lens (3) along an optical axis, the first double-convex positive lens (4) is a first compensation lens, the second double-convex positive lens (5) is a second compensation lens, and image plane defocusing caused by zoom lens movement is compensated by respectively and independently moving the first double-convex positive lens (4) and the second double-convex positive lens (5) along the optical axis, so that clear imaging in the zooming process is realized; the first positive meniscus lens (1), the first negative meniscus lens (2) are front fixed lenses, the second negative meniscus lens (6), the second positive meniscus lens (7) and the third double convex positive lens (8) are rear fixed lenses.
2. A subminiaturized airborne medium wave refrigeration infrared zoom lens system of claim 1, wherein: the focal lengths of the first positive meniscus lens (1), the first negative meniscus lens (2), the biconcave negative lens (3), the first biconvex positive lens (4), the second biconvex positive lens (5), the second negative meniscus lens (6), the second positive meniscus lens (7) and the third biconvex positive lens (8) satisfy the following conditions: f is not less than 1.7f1≤1.9f，-13.5f≤f2≤-12.0f，-0.30f≤f3≤-0.20f，0.40f≤f4≤0.50f，0.60f≤f5≤0.75f，-0.30f≤f6≤-0.20f，0.3f≤f7≤0.5f，0.30f≤f8≤0.50f；
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 first biconvex positive lens (4);
f5is the effective focal length of the second biconvex positive lens (5);
f6is the effective focal length of the second negative meniscus lens (6);
f7is the effective focal length of the second meniscus positive lens (7);
f8being a third biconvex positive lens (8)The effective focal length.
3. A subminiaturized airborne medium wave refrigeration infrared zoom lens system of claim 1, wherein: the primary image surface is positioned between the second negative meniscus lens (6) and the second positive meniscus lens (7).
4. The microminiaturized airborne medium wave refrigeration infrared continuous zoom optical system of claim 1, wherein: an aperture diaphragm is arranged at the exit pupil and is superposed with a cold diaphragm of the infrared detector.
5. A subminiaturized airborne medium wave refrigeration infrared zoom lens system of claim 1, wherein: the optical material of the first positive meniscus lens (1) is a single-crystal germanium material, the optical material of the first negative meniscus lens (2) is a silicon material, the optical material of the double-concave negative lens (3) is a single-crystal germanium material, the optical material of the first double-convex positive lens (4) is a silicon material, the optical material of the second double-convex positive lens (5) is a single-crystal germanium material, the optical material of the second negative meniscus lens (6) is a zinc selenide material, the optical material of the second positive meniscus lens (7) is a silicon material, and the optical material of the third double-convex positive lens (8) is a single-crystal germanium material.
6. A subminiaturized airborne medium wave refrigeration infrared zoom lens system of claim 1, wherein: the surface S1 of the first meniscus positive lens (1) facing the object side, the surface S5 of the biconcave negative lens (3) facing the object side, and the surface S11 of the second meniscus negative lens (6) facing the object side, and the surface S8 of the first biconvex positive lens (4) 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. A subminiaturized airborne medium wave refrigeration infrared zoom lens system of claim 1, wherein: the surface S16 of the third biconvex positive lens (8) facing the image side adopts a diffraction aspheric surface, the aspheric surface and the diffraction surface act on the same lens surface, and the surface type 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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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203981958U (en) * | 2014-06-26 | 2014-12-03 | 北京蓝思泰克科技有限公司 | A kind of large zoom ratio medium wave infrared continuous zoom lens |
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| CN113281887A (en) * | 2021-07-20 | 2021-08-20 | 西安微普光电技术有限公司 | Searching and tracking integrated infrared zoom lens and imaging method |
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| CN203981958U (en) * | 2014-06-26 | 2014-12-03 | 北京蓝思泰克科技有限公司 | A kind of large zoom ratio medium wave infrared continuous zoom lens |
| CN209167667U (en) * | 2018-09-14 | 2019-07-26 | 北京蓝思泰克科技有限公司 | A kind of big zoom ratio medium-wave infrared refrigeration continuous magnification lens |
| CN109254390A (en) * | 2018-10-17 | 2019-01-22 | 中国科学院西安光学精密机械研究所 | Compact medium wave infrared continuous zooming system |
| CN110794555A (en) * | 2019-10-30 | 2020-02-14 | 凯迈（洛阳）测控有限公司 | Miniaturized three-component continuous zooming medium-wave refrigeration infrared optical system |
| CN113281887A (en) * | 2021-07-20 | 2021-08-20 | 西安微普光电技术有限公司 | Searching and tracking integrated infrared zoom lens and imaging method |
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