CN108732731B - Five-piece compact medium wave refrigeration continuous zoom lens - Google Patents
Five-piece compact medium wave refrigeration continuous zoom lens Download PDFInfo
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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
- G02B15/16—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
- G02B15/17—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 arranged +--
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Abstract
The application discloses a five-piece compact medium wave refrigeration continuous zoom lens, which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to a target surface; the optical system adopts three groups of lenses, namely a second lens, a third lens and a fourth lens and motion, except for the traditional zoom group, namely the second lens and the compensation group, namely the third lens, and meanwhile, the fourth lens in the secondary imaging group participates in the zoom process; the optical system has the advantages that the axial dimension is compact, the difficulty in adjustment caused by adding a folded light path of the reflecting mirror is avoided, meanwhile, the optical system has higher optical axis precision and optical transmittance, the optical system is suitable for a 3-5um medium wave refrigerating machine core, the focal length range covers 20mm-200mm, and the total optical length is not more than 130mm; the device can be used for occasions requiring small optical load and light weight, such as unmanned aerial vehicle, nacelle, forest fire prevention monitoring and the like.
Description
Technical Field
The application relates to a five-piece compact medium wave refrigeration continuous zoom lens, and belongs to the technical field of optical elements.
Background
The infrared optical system is required to simultaneously provide a high-magnification small-view-field image and a low-magnification large-view-field image in the medium-wave infrared application fields such as unmanned plane, forest fire prevention, edge protection monitoring and the like so as to finish the searching, aiming and tracking functions of the system on targets, and the system is required to be compact in structure, light in weight and excellent in imaging quality.
The existing medium wave refrigeration infrared continuous zoom lens is used in cooperation with a refrigeration machine core, a 100% cold diaphragm effect is achieved by adopting secondary imaging, meanwhile, the purpose of compressing the volume of an optical system is achieved, the technical scheme can lead to the axial dimension of an optical path system to be overlong, therefore, two reflecting mirrors are usually added to fold an optical path, the number of elements of the existing optical system is more than 7, and as in the patent application with the publication number of CN 102213822A, 7 lenses and two reflecting mirrors are adopted; the patent application with publication number CN 102590990A uses 10 lenses plus two mirrors; the patent application publication CN 103389570a uses 8 lenses; the patent application with publication number CN 203981958U uses 8 lenses; the patent application publication CN 104849834a uses 7 lenses; the patent application publication CN 107193116a uses 7 lenses plus two mirrors; the lens has the problem of low system transmittance.
Disclosure of Invention
Aiming at the defects of long axial size, excessive number of lenses, low transmittance and the like of the refrigeration type medium wave infrared continuous zoom lens, the application provides a five-piece type compact medium wave refrigeration continuous zoom lens which is applicable to a medium wave refrigeration machine core and ensures that an optical system has the characteristics of compact axial size, high optical transmittance and excellent imaging.
In order to solve the technical problems, the technical scheme adopted by the application is as follows:
a five-piece compact medium wave refrigeration continuous zoom lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a refrigeration detector part which are sequentially arranged from an object space to an image space; the first lens is a meniscus lens with positive focal power and a convex surface bent to the object space, and the second lens is a biconcave lens with negative focal power; the third lens is a biconcave lens with negative focal power; the fourth lens is a meniscus lens with positive focal power and a concave surface bent to the object space; the fifth lens is a meniscus lens with positive focal power and a convex surface bent to the object space; the refrigeration detector part comprises a protection window, a cold screen diaphragm and an image surface which are sequentially arranged from an object side to an image side.
As a general knowledge, from the object side to the image side, the two surfaces of the lens are the object side surface and the image side surface in sequence.
The convex surface is bent towards the object side and is opposite to the object side, namely, the convex surface is an object side surface; the biconcave lens refers to a lens with concave object side and concave image side; the concave surface being curved toward the object means that the concave surface is opposite to the object, i.e. the concave surface is the object side.
The positions of the second lens, the third lens and the fourth lens are adjustable, and the fourth lens participates in the zooming process and also participates in secondary imaging.
The above-mentioned implementation manner of adjusting the positions of the second lens, the third lens and the fourth lens refers to the prior art, and the existing zoom lens products are sold.
Preferably, the positions of the second lens, the third lens and the fourth lens are adjustable to realize zooming in a range of 20mm to 200mm, and the zoom ratio is 10 times.
As a matter of common sense, the above-mentioned zoom ratio is the ratio of the maximum focal length and the minimum focal length.
The application ensures 100% cold diaphragm efficiency by utilizing the axial dimension of the secondary imaging compression optical system.
The medium wave continuous zoom lens described in the background technical proposal is generally composed of a front fixed group, a zoom group, a compensation group and a rear fixed group, wherein the zoom group and the compensation group realize zoom through cam tracks. The application adopts three lens movement, except the traditional zoom group (second lens) and compensation group (third lens), and one lens (fourth lens) in the secondary imaging group participates in the zoom process; the technical proposal has the advantages of realizing larger magnification zooming, ensuring the compact axial size of the optical system, avoiding increasing the folded light path of the reflecting mirror, and simultaneously having higher optical axis precision and optical transmittance.
The total optical length of the application is T, the total optical length is controlled within 130mm, and the focal length of the system in a small view field state is fn, so that T/fn is less than or equal to 0.65.
The five-piece compact medium wave refrigerating continuous zoom lens has the working wave band of 3 um-5 um, the F number (F/#) of a detector (refrigerating detector part) of 4, the focal length of 20mm-200mm continuous zooming, the large view field angle of 28 degrees multiplied by 22 degrees, the small view field angle of 2.8 degrees multiplied by 2.2 degrees, the refrigerating detector part area array of 640x512 and the pixel of 15 mu m, and is compatible with a 320x256 area array 30 mu m pixel medium wave refrigerating detector.
In order to secure an imaging effect, it is preferable that the material used for the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is at least one of single crystal germanium or single crystal silicon.
The first lens element has a first object-side surface and a first image-side surface, the second lens element has a second object-side surface and a second image-side surface, the third lens element has a third object-side surface and a third image-side surface, the fourth lens element has a fourth object-side surface and a fourth image-side surface, the fifth lens element has a fifth object-side surface and a fifth image-side surface, and the protective window has a sixth object-side surface and a sixth image-side surface; the first object side surface is a spherical surface, and the first image side surface is an aspheric surface; the second object side surface is a spherical surface, and the second image side surface is an aspheric surface; the third object side surface is an aspheric surface, and the third image side surface is an aspheric surface; the fourth object side surface is a diffraction surface, and the fourth image side surface is a spherical surface; the fifth object side surface is a spherical surface, and the fifth image side surface is an aspheric surface; the sixth object side surface is a plane and the sixth image side surface is a plane. The cold screen in the cold screen diaphragm is a plane, and the image plane is also a plane.
In order to improve the transmittance, it is preferable that the radius of curvature of the first object side is 95.6106 + -2 mm, the radius of curvature of the first image side is 219.9471 + -2 mm, the radius of curvature of the second object side is-68.1883 + -2 mm, the radius of curvature of the second image side is 48.2837 + -2 mm, the radius of curvature of the third object side is 55.6991 + -2 mm, the radius of curvature of the third image side is-67.2708 + -2 mm, the radius of curvature of the fourth object side is-15.0267 + -2 mm, the radius of curvature of the fourth image side is-18.5502 + -2 mm, the radius of curvature of the fifth object side is 31.5576 + -2 mm, and the radius of curvature of the fifth image side is 117.4784 + -2 mm.
In order to further improve the optical axis precision and the optical transmittance, the center thickness of the first lens is 6mm, the center thickness of the second lens is 2mm, the center thickness of the third lens is 4.03mm, the center thickness of the fourth lens is 11mm, the center thickness of the fifth lens is 2.6mm, and the center thickness of the protection window is 1mm; the interval between the first lens and the second lens is T2, and T2 is 8.16-30.31mm and is adjustable; the interval between the second lens and the third lens is T4, and T4 is adjustable by 17.35-2.03 mm; the interval between the third lens and the fourth lens is T6, and T6 is 19.77-35.99mm and is adjustable; the interval between the fourth lens and the fifth lens is T8, and T8 is adjustable by 23.35-1.10 mm; the interval between the fifth lens and the protection window is 11.6mm; the interval between the protection window and the cold screen diaphragm is 2.4mm; the interval between the cold screen diaphragm and the image plane is 20mm. The application has less lens number, and can ensure small axial dimension while folding the light path without adding a reflector.
The above-mentioned interval refers to the interval between the centers of the adjacent two faces of the adjacent two lenses.
The aspheric equation used for each aspheric surface is:
wherein ZA: the aspherical surface is higher than the lens vector in the optical axis direction; r: radius of curvature at the intersection of the surface and the optical axis OO'; y: the half caliber of the lens is vertical to the optical axis direction; k: a conic coefficient; A. b, C, D, E aspheric coefficients;
the diffraction plane equation used for the above diffraction plane is:
Φ＝A 1 Y 2 +A 2 Y 4
wherein Φ: is the phase of the diffraction plane; y: the half caliber of the lens is vertical to the optical axis direction; a1 and A2 diffraction plane phase coefficients.
The technology not mentioned in the present application refers to the prior art.
Aiming at the defect of excessive number of lenses of the conventional refrigeration type medium wave infrared continuous zoom lens, the application provides a five-piece type compact medium wave refrigeration continuous zoom lens which is suitable for a medium wave refrigeration machine core, has the characteristics of small number of lenses, ensures that an optical system has the characteristics of compact axial size, high optical transmittance and excellent imaging, and avoids the difficulty in adjustment caused by adding a folding optical path of a reflector; the secondary imaging is used for realizing 100% cold diaphragm efficiency, the size of the front group of lenses is compressed, and the axial length size of the optical system can be further effectively shortened; further, the ratio T/fn of the total optical length T of the system to the focal length fn of the small view field state is less than or equal to 0.65.
Drawings
FIG. 1 is a schematic diagram of a five-piece compact medium wave refrigeration continuous zoom lens with a focal length of 20 mm;
FIG. 2 is a graph of the optical transfer function of the five-piece compact medium wave chilled continuous zoom lens of the present application at a focal length of 20 mm;
FIG. 3 is a schematic diagram of the five-piece compact medium wave refrigeration continuous zoom lens of the present application at a focal length of 90 mm;
FIG. 4 is a graph of the optical transfer function of the five-piece compact medium wave chilled continuous zoom lens of the present application at a focal length of 90 mm;
FIG. 5 is a schematic diagram of the five-piece compact medium wave refrigeration continuous zoom lens of the present application at a focal length of 140 mm;
FIG. 6 is a graph of the optical transfer function of the five-piece compact medium wave chilled continuous zoom lens of the present application at a focal length of 140 mm;
FIG. 7 is a schematic diagram of the five-piece compact medium wave refrigeration continuous zoom lens of the present application at a focal length of 200 mm;
FIG. 8 is a graph of the optical transfer function of a five-piece compact medium wave chilled continuous zoom lens of the present application at a focal length of 200 mm;
FIG. 9 is a schematic diagram showing the change of the five-piece compact medium wave refrigeration continuous zoom lens from 20mm focal length to 200mm focal length;
in the figure, L1 is a first lens element, L2 is a second lens element, L3 is a third lens element, L4 is a fourth lens element, L5 is a fifth lens element, W6 is a protective window, S1 is a first object-side surface, S2 is a first image-side surface, S3 is a second object-side surface, S4 is a second image-side surface, S5 is a third object-side surface, S6 is a third image-side surface, S7 is a fourth object-side surface, S8 is a fourth image-side surface, S9 is a fifth object-side surface, S10 is a fifth image-side surface, S11 is a sixth object-side surface, S12 is a sixth image-side surface, S13 is a cold-screen diaphragm, and S14 is an image surface.
Detailed Description
For a better understanding of the present application, the following examples are further illustrated, but are not limited to the following examples.
As shown in fig. 1, 3, 5, 7, 9, a five-piece compact medium wave refrigerating continuous zoom lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a refrigerating detector section arranged in order from an object side to an image side; the first lens is a meniscus lens with positive focal power and a convex surface bent to the object space, and the second lens is a biconcave lens with negative focal power; the third lens is a biconcave lens with negative focal power; the fourth lens is a meniscus lens with positive focal power and a concave surface bent to the object space; the fifth lens is a meniscus lens with positive focal power and convex surface bent to the object space, and the materials used for the first lens, the second lens, the third lens, the fourth lens and the fifth lens are monocrystalline silicon; the refrigeration detector part comprises a protection window, a cold screen diaphragm and an image surface which are sequentially arranged from an object side to an image side.
The positions of the second lens, the third lens and the fourth lens are adjustable so as to realize zooming within the range of 20mm-200mm, the zoom ratio is 10 times, and the fourth lens participates in the zooming process and secondary imaging.
From the object space to the image space, two surfaces of the first lens are a first object side surface and a first image side surface in sequence, two surfaces of the second lens are a second object side surface and a second image side surface in sequence, two surfaces of the third lens are a third object side surface and a third image side surface in sequence, two surfaces of the fourth lens are a fourth object side surface and a fourth image side surface in sequence, two surfaces of the fifth lens are a fifth object side surface and a fifth image side surface in sequence, and two surfaces of the protection window are a sixth object side surface and a sixth image side surface in sequence; the first object side surface is a spherical surface, and the first image side surface is an aspheric surface; the second object side surface is a spherical surface, and the second image side surface is an aspheric surface; the third object side surface is an aspheric surface, and the third image side surface is an aspheric surface; the fourth object side surface is a diffraction surface, and the fourth image side surface is a spherical surface; the fifth object side surface is a spherical surface, and the fifth image side surface is an aspheric surface; the sixth object side surface is a plane and the sixth image side surface is a plane. The cold screen in the cold screen diaphragm is a plane, and the image plane is also a plane.
The curvature radius of the first object side surface is 95.6106mm, the curvature radius of the first image side surface is 219.9471mm, the curvature radius of the second object side surface is-68.1883 mm, the curvature radius of the second object side surface is 48.2837mm, the curvature radius of the third object side surface is 55.6991mm, the curvature radius of the third object side surface is-67.2708 mm, the curvature radius of the fourth object side surface is-15.0267 mm, the curvature radius of the fourth image side surface is-18.5502 mm, the curvature radius of the fifth object side surface is 31.5576mm, and the curvature radius of the fifth image side surface is 117.4784mm.
The center thickness of the first lens is 6mm, the center thickness of the second lens is 2mm, the center thickness of the third lens is 4.03mm, the center thickness of the fourth lens is 11mm, the center thickness of the fifth lens is 2.6mm, and the center thickness of the protection window is 1mm; the interval between the first lens and the second lens is T2, and T2 is 8.16-30.31mm and is adjustable; the interval between the second lens and the third lens is T4, and T4 is adjustable by 17.35-2.03 mm; the interval between the third lens and the fourth lens is T6, and T6 is 19.77-35.99mm and is adjustable; the interval between the fourth lens and the fifth lens is T8, and T8 is adjustable by 23.35-1.10 mm; the interval between the fifth lens and the protection window is 11.6mm; the interval between the protection window and the cold screen diaphragm is 2.4mm; the interval between the cold screen diaphragm and the image plane is 20mm.
The technical indexes of the lens are shown in table 1, the optical parameters are shown in table 2, and the intervals between lenses with different focal lengths are shown in table 3.
Table 1 technical index of lens in example
Table 2 specific optical parameters in examples
In the table above, L1 is the first lens element, L2 is the second lens element, L3 is the third lens element, L4 is the fourth lens element, L5 is the fifth lens element, W6 is the protective window, S1 is the first object-side surface, S2 is the first image-side surface, S3 is the second object-side surface, S4 is the second image-side surface, S5 is the third object-side surface, S6 is the third image-side surface, S7 is the fourth object-side surface, S8 is the fourth image-side surface, S9 is the fifth object-side surface, S10 is the fifth image-side surface, S11 is the sixth object-side surface, S12 is the sixth image-side surface, S13 is the cold-screen stop, and S14 is the image-plane; radius of curvature refers to the radius of curvature of each lens surface; the interval refers to the lens thickness or the adjacent lens surface distance, that is, the interval corresponding to S1 refers to the center thickness of the first lens L1, the interval corresponding to S2 refers to the interval between the center of S2 and the center of S3, the interval corresponding to S3 refers to the center thickness of L2, the interval corresponding to S4 refers to the interval between the center of S4 and the center of S5, the interval corresponding to S5 refers to the center thickness of L3, the interval corresponding to S6 refers to the interval between the center of S6 and the center of S7, the interval corresponding to S7 refers to the center thickness of L4, the interval corresponding to S8 refers to the interval between the center of S8 and the center of S9, the interval corresponding to S9 refers to the center thickness of L5, the interval corresponding to S10 refers to the interval between the center of S10 and the center of S11, the interval corresponding to the center thickness of W6, the interval corresponding to S12 refers to the interval between the center of S12 and the center of S13, and the interval corresponding to S13 refers to the interval between the center of S13 and the center of S14. The material is the material used for the lenses, and the air refers to the medium between the two lenses being air.
Table 3 shows lens spacing for different focal lengths for the examples
In the above table, T2 is the interval between the first lens and the second lens, T4 is the interval between the second lens and the third lens, T6 is the interval between the third lens and the fourth lens, and T8 is the interval between the fourth lens and the fifth lens.
The aspheric equation used for each aspheric surface is:
wherein ZA: the aspherical surface is higher than the lens vector in the optical axis direction; r: radius of curvature at the intersection of the surface and the optical axis OO'; y: the half caliber of the lens is vertical to the optical axis direction; k: a conic coefficient; A. b, C, D, E aspherical coefficients, in this example, the aspherical surfaces of each aspherical surface are shown in table 4;
table 4 examples of aspherical coefficients
In the above table, the aspherical coefficients are represented by scientific counting method, 7.9168E-07 represents 7.9168 ×10 -07 The method comprises the steps of carrying out a first treatment on the surface of the S2 is the first image side, S4 is the second image side, S5 is the third object side, S6 is the third image side, S7 is the fourth object side, and S10 is the fifth image side.
The diffraction plane equation used for the diffraction plane is:
Φ＝A 1 Y 2 +A 2 Y 4
wherein: Φ: is the phase of the diffraction plane; y: the half caliber of the lens is vertical to the optical axis direction; a1 and A2 diffraction plane phase coefficients.
Table 5 use of diffraction plane coefficients in the examples
In the table above, S7 is the fourth object side; the diffraction plane phase coefficient is expressed by adopting a scientific counting method.
Fig. 2 is a graph of the optical transfer function of the present embodiment at a focal length of 20mm, fig. 4 is a graph of the optical transfer function of the present embodiment at a focal length of 90mm, fig. 6 is a graph of the optical transfer function of the present embodiment at a focal length of 140mm, and fig. 8 is a graph of the optical transfer function of the present embodiment at a focal length of 200 mm.
The axial dimension of the optical system is compressed by utilizing the secondary imaging, so that the 100% cold diaphragm efficiency is ensured; three groups of lens motion are adopted, except for a zoom group and a compensation group in the traditional sense, and one lens in the secondary imaging group participates in the zoom process; the technical proposal has the advantages of realizing larger magnification zooming, ensuring the compact axial size of the optical system, avoiding increasing the folded light path of the reflecting mirror, and simultaneously having higher optical axis precision and optical transmittance.
In this embodiment, the total optical length is T, specifically t=130 mm, and the focal length of the system in the small field state is fn, where T/fn is less than or equal to 0.65.
The working wave band of the medium wave refrigeration continuous zoom lens is 3 um-5 um, F/# is 4, and the focal length is 20mm-200mm for continuous zooming, and the medium wave refrigeration continuous zoom lens can be used for 640x512 area arrays; and the medium wave refrigerating machine core with the size of 15um is compatible with the 320x256 area array 30um pixel machine core.
The five-piece type compact medium wave refrigeration continuous zoom lens is suitable for a medium wave refrigeration machine core, has the advantages of being small in number of lenses, guaranteeing that an optical system has the characteristics of compact axial size, high optical transmittance and good imaging, and avoiding the difficulty in adjustment caused by adding a folding optical path of a reflecting mirror; the ratio T/fn of the total optical length T of the system to the focal length fn of the small view field state is less than or equal to 0.65; by using secondary imaging, not only 100% cold stop efficiency is achieved, but also the axial length dimension of the optical system can be further effectively shortened by compressing the size of the front set of lenses.
Claims (7)
1. A five-piece compact medium wave refrigeration continuous zoom lens is characterized in that: the device comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a refrigerating detector part which are sequentially arranged from an object space to an image space; the first lens is a meniscus lens with positive focal power and a convex surface bent to the object space, and the second lens is a biconcave lens with negative focal power; the third lens is a biconvex lens with positive focal power; the fourth lens is a meniscus lens with positive focal power and a concave surface bent to the object space; the fifth lens is a meniscus lens with positive focal power and a convex surface bent to the object space; the refrigeration detector part comprises a protection window, a cold screen diaphragm and an image surface which are sequentially arranged from an object space to an image space;
five lenses with focal power;
any one of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is made of monocrystalline germanium or monocrystalline silicon;
from the object space to the image space, two surfaces of the first lens are a first object side surface and a first image side surface in sequence, two surfaces of the second lens are a second object side surface and a second image side surface in sequence, two surfaces of the third lens are a third object side surface and a third image side surface in sequence, two surfaces of the fourth lens are a fourth object side surface and a fourth image side surface in sequence, and two surfaces of the fifth lens are a fifth object side surface and a fifth image side surface in sequence; the curvature radius of the first object side surface is 95.6106 +/-2 mm, the curvature radius of the first image side surface is 219.9471 +/-2 mm, the curvature radius of the second object side surface is-68.1883 +/-2 mm, the curvature radius of the second image side surface is 48.2837 +/-2 mm, the curvature radius of the third object side surface is 55.6991 +/-2 mm, the curvature radius of the third image side surface is-67.2708 +/-2 mm, the curvature radius of the fourth object side surface is-15.0267 +/-2 mm, the curvature radius of the fourth image side surface is-18.5502 +/-2 mm, the curvature radius of the fifth object side surface is 31.5576 +/-2 mm, and the curvature radius of the fifth image side surface is 117.4784 +/-2 mm;
the center thickness of the first lens is 6mm, the center thickness of the second lens is 2mm, the center thickness of the third lens is 4.03mm, the center thickness of the fourth lens is 11mm, the center thickness of the fifth lens is 2.6mm, and the center thickness of the protection window is 1mm; the interval between the first lens and the second lens is T2, and T2 is 8.16-30.31mm and is adjustable; the interval between the second lens and the third lens is T4, and T4 is adjustable by 17.35-2.03 mm; the interval between the third lens and the fourth lens is T6, and T6 is 19.77-35.99mm and is adjustable; the interval between the fourth lens and the fifth lens is T8, and T8 is adjustable by 23.35-1.10 mm; the interval between the fifth lens and the protection window is 11.6mm; the interval between the protection window and the cold screen diaphragm is 2.4mm; the interval between the cold screen diaphragm and the image plane is 20mm.
2. The five-piece compact medium wave refrigerated continuous zoom lens of claim 1, wherein: the positions of the second lens, the third lens and the fourth lens are adjustable, and the fourth lens participates in the zooming process and also participates in secondary imaging.
3. The five-piece compact medium wave refrigerated continuous zoom lens of claim 2, wherein: the positions of the second lens, the third lens and the fourth lens are adjustable so as to realize zooming within the range of 20mm-200mm, and the zoom ratio is 10 times.
4. A five-piece compact medium wave refrigerated continuous zoom lens as claimed in any one of claims 1 to 3, wherein: from the object side to the image side, the two sides of the protection window are a sixth object side surface and a sixth image side surface in sequence; the first object side surface is a spherical surface, and the first image side surface is an aspheric surface; the second object side surface is a spherical surface, and the second image side surface is an aspheric surface; the third object side surface is an aspheric surface, and the third image side surface is an aspheric surface; the fourth object side surface is a diffraction surface, and the fourth image side surface is a spherical surface; the fifth object side surface is a spherical surface, and the fifth image side surface is an aspheric surface; the sixth object side surface is a plane and the sixth image side surface is a plane.
5. The five-piece compact medium wave refrigerated continuous zoom lens of claim 4, wherein: the adopted aspheric equation is:
wherein ZA: the aspherical surface is higher than the lens vector in the optical axis direction; r: radius of curvature at the intersection of the surface and the optical axis OO'; y: the half caliber of the lens is vertical to the optical axis direction; k: a conic coefficient; A. b, C, D, E aspheric coefficients;
the diffraction plane equation used is:
Φ＝A 1 Y 2 +A 2 Y 4
wherein: Φ: is the phase of the diffraction plane; y: the half caliber of the lens is vertical to the optical axis direction; a1 and A2 diffraction plane phase coefficients.
6. A five-piece compact medium wave refrigerated continuous zoom lens as claimed in any one of claims 1 to 3, wherein: t/fn is less than or equal to 0.65, wherein T is the total optical length, and fn is the focal length of the system in a small view field state.
7. A five-piece compact medium wave refrigerated continuous zoom lens as claimed in any one of claims 1 to 3, wherein: the working wave band is 3 um-5 um, F number is 4, focal length is 20mm-200mm, zoom continuously, large view field angle is 28 degree x 22 degree, small view field angle is 2.8 degree x 2.2 degree, refrigerating detector partial area array is 640x512, pixel is 15 μm.
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| CN102062932A (en) * | 2010-10-22 | 2011-05-18 | 中国航空工业集团公司洛阳电光设备研究所 | Uncooled double-field-of-view infrared optical system |
| RU2463633C1 (en) * | 2011-05-26 | 2012-10-10 | Российская Федерация, от имени которой выступает Министерство промышленности и торговли | Objective lens with variable focal distance for operation in two infrared spectral regions |
| CN205539680U (en) * | 2015-11-30 | 2016-08-31 | 三河市蓝思泰克光电科技有限公司 | Long -focus long wave infrared continuous zoom lens |
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| CN208737090U (en) * | 2018-08-23 | 2019-04-12 | 南京波长光电科技股份有限公司 | A kind of five chip compact medium waves refrigeration continuous magnification lens |
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| RU2463633C1 (en) * | 2011-05-26 | 2012-10-10 | Российская Федерация, от имени которой выступает Министерство промышленности и торговли | Objective lens with variable focal distance for operation in two infrared spectral regions |
| CN205539680U (en) * | 2015-11-30 | 2016-08-31 | 三河市蓝思泰克光电科技有限公司 | Long -focus long wave infrared continuous zoom lens |
| CN205539681U (en) * | 2015-12-11 | 2016-08-31 | 三河市蓝思泰克光电科技有限公司 | Become multiple proportions long wave infrared continuous -zoom lens greatly |
| CN208737090U (en) * | 2018-08-23 | 2019-04-12 | 南京波长光电科技股份有限公司 | A kind of five chip compact medium waves refrigeration continuous magnification lens |
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