CN216285921U - Long-wave infrared lens adaptive to high-definition assembly - Google Patents
Long-wave infrared lens adaptive to high-definition assembly Download PDFInfo
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- CN216285921U CN216285921U CN202122894693.1U CN202122894693U CN216285921U CN 216285921 U CN216285921 U CN 216285921U CN 202122894693 U CN202122894693 U CN 202122894693U CN 216285921 U CN216285921 U CN 216285921U
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Abstract
The utility model discloses a long wave infrared camera lens of adaptation high definition subassembly, include along optical axis from the object space to image space lens group, detector protection window and the detector that arrange in proper order, the lens group includes first lens, aperture diaphragm, focusing mirror group and second lens, focusing mirror group includes at least one focusing lens, first lens focusing lens with at least one surface is aspheric surface, at least one surface is the sphere and at least one surface is the diffraction face in the second lens. According to the long-wave infrared lens adaptive to the high-definition assembly, aberration can be effectively corrected, and imaging quality is improved.
Description
Technical Field
The utility model relates to the technical field of optical imaging, in particular to a long-wave infrared lens adaptive to a high-definition assembly.
Background
Currently, the mainstream infrared detector array scale is as follows: 384 × 288, 640 × 512, 1024 × 768, etc. With the continuous progress of the infrared detection technology, the array scale of the focal plane of the infrared detector is continuously increased, and meanwhile, the pixel size is gradually reduced. However, most of the long-wave infrared lens optical systems on the market at present are designed for small area array detectors, have small image height, and cannot be adapted to high-definition components with large detector array scale, such as infrared detectors with array scale of 1280 × 1024. The use of a large-area array detector with a long-wave infrared lens with small image height causes the waste of detector resources, and the output image has dark corners and black edges.
In order to achieve better imaging quality, most of the existing infrared lenses adopt more spherical lenses to correct aberrations, and the excessive number of lenses can increase signal attenuation, and further increase the weight and cost of the lenses. In addition, the long-wave infrared lens is mostly in a severe use environment and has a large temperature change range, the temperature coefficient of the refractive index of the infrared lens material is much larger than that of a visible light material, and the optimal image plane is shifted due to temperature change, so that image blurring is caused, and the imaging quality is reduced.
Therefore, the long-wave infrared lens adaptive to the high-definition assembly is necessary to be developed according to the defects of the prior art, so that the long-wave infrared lens can be adaptive to the large-area-array infrared detector and can ensure good imaging quality within a wider temperature range.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a long-wave infrared lens adaptive to a high-definition assembly, which can effectively correct aberration and improve imaging quality.
The long-wave infrared lens adaptive to the high-definition assembly comprises a lens group, a detector protection window and a detector which are sequentially arranged from an object side to an image side along an optical axis, wherein the lens group comprises a first lens, an aperture diaphragm, a focusing lens group and a second lens, the focusing lens group comprises at least one focusing lens, at least one surface of the first lens, the focusing lens and the second lens is an aspheric surface, at least one surface of the first lens, the focusing lens and the second lens is a spherical surface, and at least one surface of the first lens, the focusing lens and the second lens is a diffraction surface.
According to some embodiments of the present invention, the first lens, the aperture stop, the focusing lens group, and the second lens are arranged in order from an object side to an image side along the optical axis.
According to some embodiments of the utility model, at least one of the first lens and the at least one focusing lens is spherical and at least one of the surfaces is an aspherical lens, and one of the surfaces of the second lens is a diffractive surface.
According to some embodiments of the present invention, the focusing lens group includes a first focusing lens and a second focusing lens arranged in order from an object side to an image side along an optical axis.
Optionally, the aperture stop is disposed in close contact with a surface of the first focusing lens facing the object.
Optionally, a surface of the first lens facing the object space is an aspheric surface, a surface of the first lens facing the image space is a spherical surface, a surface of the first focusing lens facing the object space is a spherical surface, a surface of the first focusing lens facing the image space is an aspheric surface, a surface of the second focusing lens facing the object space is a spherical surface, a surface of the second focusing lens facing the image space is an aspheric surface, a surface of the second lens facing the object space is a spherical surface, and a surface of the second lens facing the image space is a diffraction surface.
Optionally, the diffractive surface of the second lens is a diffractive surface based on an even-order aspheric substrate.
According to some embodiments of the present invention, the focusing lens group is movable in an optical axis direction, and an optical axis movement amount Δ L of the focusing lens group1Satisfies the following conditions: Δ L of-8.5 mm ≦1≤0.9mm。
According to some embodiments of the utility model, the lens group is movable in an optical axis direction with respect to the detector, a moving amount Δ L of the lens group2Satisfies the following conditions: Δ L of-4.8 mm ≦2≤0.8mm。
According to some embodiments of the utility model, the detector has a number of pixels in a horizontal direction equal to or greater than 1280 and a number of pixels in a vertical direction equal to or greater than 1024; the detector pixel interval a meets the following conditions: a is more than or equal to 6 mu m and less than or equal to 15 mu m.
Therefore, the adaptive high-definition component provided by the embodiment of the utility model can effectively correct aberration and improve imaging quality by the mixed matching design of spherical surfaces, aspherical surfaces and diffraction surface types of different lens surfaces, and simultaneously effectively reduces the number of system lenses, the volume of a system and the weight of the system; the reasonable design of the aspheric surface profile and the diffraction surface is beneficial to the turning process of the diamond lathe, the profile precision is high, and the imaging quality is ensured. In addition, the whole focusing or the focusing mode of the focusing mirror group can be adopted to ensure that the imaging distance can be clearly imaged from 0.2m to infinity, and simultaneously ensure that the lens can clearly image within the temperature range of-40 ℃ to 60 ℃. The number F of the lens is equal to 1, the focal length is 30mm, the diameter of an image circle is 25mm, and the requirement of the market on the long-wave infrared lens capable of being matched with a 1280 multiplied by 1024 high-definition detector is met.
Drawings
FIG. 1 is a schematic diagram of a long wave infrared lens adapted to a high definition assembly according to one embodiment of the present invention;
FIG. 2 is an MTF curve at 20 ℃ for a long wave infrared lens fitted with a high definition assembly according to one embodiment of the present invention;
FIG. 3 is an MTF curve at-40 ℃ for a long wavelength infrared lens fitted with a high definition assembly according to one embodiment of the present invention;
figure 4 is an MTF curve at 60 ℃ for a long wave infrared lens fitted with a high definition assembly according to one embodiment of the present invention.
Reference numerals:
100: a long-wave infrared lens adapted to the high-definition assembly;
10: a lens group; 1: a first lens;
2: focusing mirror group, 21: first focus lens, 22: a second focus lens;
3: a second lens;
4: an aperture diaphragm;
20: detector protection window, 30: a detector;
s1: object-side-oriented surface of the first lens, S2: image-side-oriented surface of the first lens, S3: object-side facing surface of the first focus lens, S4: the first focus lens faces the image side, S5: object-side facing surface of the second focus lens, S6: surface of the second focus lens facing the image side, S7: object-side-oriented surface of the second lens, S8: the second lens faces the image side.
Detailed Description
The following describes the long-wavelength infrared lens 100 adapted to a high definition module according to the present invention in further detail with reference to the accompanying drawings and the detailed description.
A long-wave infrared lens 100 adapted to a high definition module according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, a long-wave infrared lens 100 adapted to a high definition assembly according to an embodiment of the present invention may include a lens group 10, a detector protection window 20 and a detector 30, which are sequentially arranged along an optical axis from an object side, which is referred to as a light incident side, to an image side, which is referred to as an emergent side, and from the object side to the image side along the optical axis, which is a front-to-back direction in fig. 1.
The lens group 10 includes a first lens 1, an aperture stop 4, a focusing lens group 2 and a second lens 3, the focusing lens group 2 includes at least one focusing lens, that is, the focusing lens group 2 may include one focusing lens or the focusing lens group 2 may include a plurality of focusing lenses, in the example shown in fig. 1, the focusing lens group 2 includes two focusing lenses, that is, a first focusing lens 21 and a second focusing lens 22, the first focusing lens 21 and the second focusing lens 22 are sequentially disposed along an optical axis from an object side to an image side, that is, the first focusing lens 21 is disposed in front of the second focusing lens 22.
Alternatively, the focusing lens group 2 may be disposed between the first lens 1 and the second lens 3, and it is understood that the focusing lens group 2 may not be disposed between the first lens 1 and the second lens 3, for example, the focusing lens group 2 may be disposed in front of the first lens 1 or behind the second lens 3. The number of the focusing lenses of the focusing lens group 2 and the specific position of the focusing lens group 2 can be set according to actual needs. As shown in fig. 1, the first lens 1, the aperture stop 4, the focusing lens group 2, and the second lens 3 are arranged in this order from the object side to the image side along the optical axis.
At least one surface among the first lens 1, the focusing lens and the second lens 3 is a diffractive surface, at least one surface is a spherical surface and at least one surface is a diffractive surface, specifically, each lens has two opposite surfaces, i.e., a surface facing an object side and a surface facing an image side, the lens group 10 includes a plurality of lenses such as the first lens 1, the focusing lens and the second lens 3, then the lens group 10 has a plurality of lens surfaces including at least one aspherical surface, at least one spherical surface and at least one diffractive surface, and the use of the aspherical surface in the optical system can reduce the number of lenses in the system, effectively eliminate spherical aberration and coma aberration, reduce optical energy loss, and improve imaging quality; the diffraction surface is favorable for achromatization, the lens with the diffraction surface is a lens with the diffraction surface processed on the surface of the lens, the dispersion characteristic (material independence and negative value characteristic) of the diffraction optical element is favorable for achromatization, a refraction and diffraction mixed optical system with good achromatization performance can be formed by the diffraction optical element and the refraction element, and the negative thermal difference characteristic of the diffraction optical element is favorable for athermalization of the optical system.
Therefore, according to the long-wave infrared lens 100 adaptive to the high-definition component, provided by the embodiment of the utility model, through the mixed matching design of spherical surfaces, aspheric surfaces and diffraction surface types of different lens surfaces, aberration can be effectively corrected, the imaging quality is improved, the number of system lenses is effectively reduced, the volume of a system is reduced, and the weight of the system is reduced; the reasonable design of the aspheric surface profile and the diffraction surface is beneficial to the turning process of the diamond lathe, the profile precision is high, and the imaging quality is ensured. In addition, the whole focusing or the focusing mode of the focusing mirror group 2 can be adopted to ensure that the imaging distance can be clearly imaged from 0.2m to infinity, and simultaneously ensure that the lens can clearly image within the temperature range of-40 ℃ to 60 ℃. The number F of the lens is equal to 1, the focal length is 30mm, the diameter of an image circle is 25mm, and the requirement of the market on the long-wave infrared lens 100 capable of being matched with the 1280 multiplied by 1024 high-definition detector 30 is met.
In some embodiments of the present invention, at least one of the first lens 1 and the at least one focusing lens is a spherical surface and at least one of the surfaces is an aspherical lens, and one of the surfaces of the second lens 3 is a diffractive surface, specifically, at least one of the first lens 1 and the focusing lens is an aspherical lens and at least one is a spherical lens, so that the lens group 10 includes at least one spherical surface and at least one aspherical surface, or both surfaces of at least one of the first lens 1 and the focusing lens are a spherical surface and an aspherical surface, respectively, and other lenses may be disposed as needed, for example, both side surfaces of the first lens 1 may be a spherical surface and an aspherical surface, respectively, and both side surfaces of the focusing lens are a spherical surface and an aspherical surface, respectively.
In some specific examples of the present invention, the focusing mirror group 2 includes a first focusing lens 21 and a second focusing lens 22 arranged in this order from the object side to the image side along the optical axis. The aperture stop 4 is provided in close contact with the object side surface of the first focus lens 21. The surface S1 of the first lens 1 facing the object is aspheric, the surface S2 of the first lens facing the image is spherical, the surface S3 of the first focus lens 21 facing the object is spherical, the surface S4 of the first focus lens 21 facing the image is aspheric, the surface S5 of the second focus lens 22 facing the object is spherical, the surface S6 of the second focus lens 22 facing the image is aspheric, the surface S7 of the second lens 3 facing the object is spherical, and the surface S8 of the second lens 3 facing the image is diffractive. Further, the diffraction surface of the second lens 3 may be a diffraction surface based on an even-order aspherical base.
In a specific example of the present invention, the optical data of the lens of the present embodiment is as shown in table 1 below, where in table 1, the surface numbers refer to the sequential numbering of each surface from the object side of the first lens 1 to the image side of the probe protection window 20 along the optical axis from the object plane to the image plane. Also included in table 1 are: the surface type of each surface, the radius of curvature R of each surface, the thickness of each lens or the distance d between two adjacent lenses, and the material of each lens, wherein S9 and S10 are the two surfaces of the probe protection window 20, S9 is the surface of the probe protection window 20 facing the object, S10 is the surface of the probe protection window 20 facing the image, the surfaces S9 and S10 may both be flat surfaces, so that the radius of curvature is infinity (infinity), and the surface number S11 is the imaging surface (where the light converges through the front optical system), that is, the surface of the probe 30.
TABLE 1
In some embodiments of the present invention, the focusing lens group 2 is movable along the optical axis direction, that is, the focusing lens group 2 is movable along the front-back direction as shown in fig. 1, for implementing a close-distance focusing function and compensating for defocusing of image plane caused by temperature change, wherein the optical axis movement amount Δ L of the focusing lens group 21Satisfies the following conditions: Δ L of-8.5 mm ≦1The moving direction is opposite to the light propagation direction, specifically, the maximum moving amount of the focusing mirror group 2 in the forward moving direction may be 8.5mm, and the maximum moving amount of the focusing mirror group 2 in the backward moving direction may be 0.9 mm.
In some embodiments of the present invention, the lens group 10 is movable in the optical axis direction relative to the detector 30, that is, the first lens 1, the aperture stop 4, the focusing lens group 2 and the second lens 3 are integrally movable in the optical axis direction, so that the distance between the whole lens and the detector 30 can be adjusted by adopting a whole-group focusing manner to realize close-range focusing and compensate image plane defocusing caused by temperature change, wherein the movement amount Δ L of the lens group 10 is2Satisfies the following conditions: Δ L of-4.8 mm ≦2Less than or equal to 0.8 mm. The minus sign indicates that the moving direction is opposite to the light traveling direction, and specifically, the maximum moving amount of the forward moving direction of the lens group 10 may be 4.8mm, and the maximum moving amount of the backward moving direction of the lens group 10 may be 0.8 mm. Therefore, clear imaging from 0.2m to infinity can be realized by adopting the whole focusing mode or the focusing mode of the focusing mirror group, and the lens can be ensured to be imaged clearly within the temperature range of-40 ℃ to 60 ℃. The number F of the lens is equal to 1, the focal length is 30mm, the diameter of an image circle is 25mm, and the requirement of the market on the long-wave infrared lens capable of being matched with a 1280 multiplied by 1024 high-definition detector is met.
In the embodiment of the present invention, the surface S1 of the first lens 1 facing the object side, the surface S4 of the first focusing lens facing the image side, and the surface S6 of the second focusing lens 22 facing the image side may all adopt even aspheric surface type, the surface of the second lens 3 facing the image side S8 is a diffractive surface, and other surfaces may all adopt spherical surface type, wherein the expression of the even aspheric surface type is as follows:
in the above expression, Z is a distance rise from the aspherical surface to the fixed focus when Z is a position of the aspherical surface at a height of R in the optical axis direction, C0R is a radius of curvature of each aspheric surface, K is a conic coefficient, Y is a distance from a point on the aspheric surface to the optical axis, A, B, C, D … … is each high-order term coefficient, specifically, A, B, C, D … … is each second-order term coefficient, fourth-order term coefficient, sixth-order term coefficient, eighth-order term coefficient … … term coefficient.
The aspherical surface type parameters for each of the examples are listed in table 2 below, and in table 2 are even aspherical surface coefficients for surfaces S1, S4, S6 and S8, wherein no other order term coefficients are used, for example, no second order term coefficients and no eighth order term coefficients are used, i.e., a and D are both zero:
TABLE 2
| Surface number | Coefficient of cone | Coefficient of fourth order term | Coefficient of six orders |
| S1 | 0 | -4.49e-07 | -2.14 |
| S4 | |||
| 0 | 1.87e-07 | -9.77e-10 | |
| S6 | 0 | -5.05e-06 | 1.30 |
| S8 | |||
| 0 | 9.41e-06 | -1.70e-08 |
In the present embodiment, the rear surface S8 of the second lens element 3 is a diffractive surface based on an even-order aspherical base, and the aspherical surface type parameters thereof are listed in table 2, and the diffractive surface parameters of the rear surface of the second lens element 3 of the present embodiment are listed in table 3.
TABLE 3
The detector 30 has a horizontal pixel number of 1280 or more and a vertical pixel number of 1024 or more; the pixel spacing a of the detector 30 satisfies: a is more than or equal to 6 mu m and less than or equal to 15 mu m.
According to the long-wave infrared lens 100 adapted to the high-definition component of the embodiment of the present invention, as shown in fig. 2 to 4, MTF (modulation transfer function) graphs of the long-wave infrared lens 100 adapted to the high-definition component at three different temperatures of-40 ℃, 20 ℃ and 60 ℃ are respectively shown, each graph in the graphs refers to MTF curves of different fields (distinguished by image height, for example, a central field is 0mm, and further, 2mm, 4mm, 8.6mm, 10.1mm, and a peripheral field is 12.33mm, etc.), each field has two directions of meridional and sagittal, as shown in fig. 2 to 4, a solid line is a meridional direction test result of different fields, a dotted line is a sagittal direction test result of different fields, a modulation transfer function curve of the optical system shown in fig. 2 to 4 is close to a diffraction limit of the optical system, and the curve is relatively gentle and does not change greatly as a whole, the imaging quality is good. Therefore, as can be seen from the above graph, the imaging quality of the long-wave infrared lens 100 adapted to the high definition module according to the embodiment of the present invention is good at-40 ℃ to 60 ℃, that is, the long-wave infrared lens 100 adapted to the high definition module according to the embodiment of the present invention can work at an ambient temperature of-40 ℃ to 60 ℃, and the performance index of the long-wave infrared lens 100 adapted to the high definition module according to an embodiment of the present invention can be as follows: focal length: 30 mm; relative pore diameter: 1.0; the working wavelength is as follows: 8-12 μm; field range: 18.4 ° (H) x 14.7 ° (V); diameter of the image circle: 25 mm; adapting the probe 30 specification: 1280 × 1024,15 μm; working temperature range: -40 ℃ to 60 ℃; the closest imaging distance: 0.2 m.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a long wave infrared camera lens of high definition subassembly of adaptation, its characterized in that includes along the optical axis from the object space to the image space lens group, detector protection window and the detector that arrange in proper order, the lens group includes first lens, aperture diaphragm, focusing mirror group and second lens, focusing mirror group includes at least one focusing lens, first lens focusing lens with at least one surface is aspherical surface, at least one surface is the sphere and at least one surface is the diffraction face in the second lens.
2. The long-wavelength infrared lens adaptive to a high-definition assembly according to claim 1, wherein the first lens, the aperture stop, the focusing lens group and the second lens are arranged in sequence from an object side to an image side along an optical axis.
3. The high definition module compliant long wave infrared lens of claim 1 wherein at least one of the first lens and the at least one focusing lens is spherical and at least one of the surfaces is aspheric, and one of the surfaces of the second lens is a diffractive surface.
4. The adaptive high definition assembly long wave infrared lens of claim 1, wherein the focusing lens group comprises a first focusing lens and a second focusing lens arranged in sequence from an object side to an image side along an optical axis.
5. The adaptive high definition module long wave infrared lens of claim 4, wherein the aperture stop is disposed closely on the object side of the first focusing lens.
6. The long-wavelength infrared lens matched with a high-definition module as claimed in claim 4, wherein a surface of the first lens facing to an object side is an aspheric surface, a surface of the first lens facing to an image side is a spherical surface, a surface of the first focusing lens facing to the object side is a spherical surface, a surface of the first focusing lens facing to the image side is an aspheric surface, a surface of the second focusing lens facing to the object side is a spherical surface, a surface of the second focusing lens facing to the image side is an aspheric surface, a surface of the second lens facing to the object side is a spherical surface, and a surface of the second lens facing to the image side is a diffractive surface.
7. The high definition assembly compliant long wave infrared lens of claim 6 wherein the diffractive surface of said second lens is a diffractive surface based on an even aspheric base.
8. The adaptive high definition module long wavelength infrared lens of claim 1, wherein the focusing lens group is movable along an optical axis, and an optical axis movement amount Δ L of the focusing lens group1Satisfies the following conditions: Δ L of-8.5 mm ≦1≤0.9mm。
9. The high definition module compliant long wave infrared lens of claim 1 wherein the lens group is movable in the direction of the optical axis relative to the detector, the lens group being movable in the direction of the optical axisAmount of movement Δ L of group2Satisfies the following conditions: Δ L of-4.8 mm ≦2≤0.8mm。
10. The long-wavelength infrared lens of adaptive high-definition assembly according to claim 1, wherein the number of pixels in horizontal direction of the detector is 1280 or more, and the number of pixels in vertical direction is 1024 or more; the detector pixel interval a meets the following conditions: a is more than or equal to 6 mu m and less than or equal to 15 mu m.
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