20-degree field-of-view near-infrared lens for unmanned aerial vehicle
By designing a near-infrared lens for UAVs with a specific lens combination, the problem of poor imaging clarity of UAVs in high-altitude environments has been solved, achieving efficient detection and identification capabilities, and is suitable for imaging large-scale targets.
Patent Information
- Application Number
- CN202323500114.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-21
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2033-12-21
AI Technical Summary
The near-infrared lenses on existing drones are easily interfered with in high-altitude environments, resulting in poor image clarity, and their detection and identification capabilities are insufficient, especially under special weather conditions.
Design a 20° field-of-view near-infrared lens for UAVs, employing a lens combination of specific materials and structures, including plano-convex lenses, biconvex lenses, biconcave lenses, and filters, to optimize imaging performance through aperture surfaces and filters.
It achieves high imaging transfer function and low distortion, enhances anti-interference and imaging clarity, improves detection and identification capabilities, and is suitable for imaging large-scale targets.
Smart Images
Figure CN223784551U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to optical lens technical field, concretely relates to a 20 degree field of view near infrared lens for unmanned plane. BACKGROUND
[0002] The optical lens carried in the aviation field has relatively harsh working environment, so it is difficult to realize clear imaging.
[0003] In the prior art, when the optical lens is carried on the unmanned plane for remote sensing, surveying and mapping and investigation, in the high altitude, the environmental temperature, atmospheric pressure and other parameters change constantly, especially under the special weather conditions such as heavy fog, rain, snow and frost, the near infrared lens is easily disturbed, the detection and identification ability is poor, and the imaging clarity is poor. In order to realize clear imaging, the optical lens imaging distortion is low, and the imaging transfer function is high. UTILITY MODEL CONTENT
[0004] Therefore, the utility model aims at providing a 20 degree field of view near infrared lens for unmanned plane, which has simple structure, high imaging transfer function and low distortion.
[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] A 20 degree field of view near infrared lens for unmanned plane, comprising plano-convex lens, first double convex lens, first double concave lens, second double concave lens, plano-concave lens, second double convex lens, third double convex lens, third double concave lens, window sheet and optical filter, which are coaxially arranged in sequence along the propagation direction of light.
[0007] The first double convex lens and the first double concave lens form a first double cemented lens.
[0008] The plano-concave lens and the second double convex lens form a second double cemented lens.
[0009] The curvature radius of the front surface of the plano-concave lens is 91.18mm, and the thickness is 16.52mm.
[0010] The optical filter is used for filtering non-near infrared band light.
[0011] Further, the material of the plano-concave lens is H-FK61.
[0012] Further, the material of the first double convex lens is H-FK61, the curvature radii of the front and rear surfaces are-374.86mm and 82.97mm respectively, the spacing between the first double convex lens and the plano-concave lens is 0.49mm, and the thickness of the first double convex lens is 16.52mm.
[0013] The material of the first double-concave lens is H-LAK7, the radii of curvature of front and back surfaces are -175.34mm and 131.55mm respectively, and the thickness of the first double-concave lens is 5.9mm.
[0014] Further, the material of the second double-concave lens is H-K9L, the radii of curvature of front and back surfaces are -100.21mm and 110.13mm respectively, the interval between the second double-concave lens and the first double-concave lens is 8.45mm, the thickness of the second double-concave lens is 5.31mm, and the interval between the second double-concave lens and the diaphragm surface is 5.69mm.
[0015] Further, the material of the flat-concave lens is H-QF50, the radius of curvature of the back surface is 343.57mm, the interval between the flat-concave lens and the diaphragm surface is 1.31mm, and the thickness of the flat-concave lens is 5.07mm.
[0016] The material of the second double-convex lens is H-LAF1, the radii of curvature of front and back surfaces are 65.30mm and -104.70mm respectively, and the thickness of the second double-convex lens is 14.16mm.
[0017] Further, the material of the third double-convex lens is H-ZLAF60, the radii of curvature of front and back surfaces are 78.50mm and -456.31mm respectively, the interval between the third double-convex lens and the second double-convex lens is 49.70mm, and the thickness of the third double-convex lens is 7.79mm.
[0018] Further, the material of the third double-concave lens is H-ZLAF60, the radii of curvature of front and back surfaces are -92.63mm and 135.43mm respectively, the interval between the third double-concave lens and the third double-convex lens is 2.06mm, and the thickness of the third double-concave lens is 3.78mm.
[0019] Further, the material of the window sheet is SILICON, the interval between the window sheet and the third double-concave lens is 11.67mm, and the thickness of the window sheet is 2.36mm.
[0020] Further, the material of the filter is SILICON, the interval between the filter and the window sheet is 10.69mm, the thickness of the filter is 2.36mm, and the interval between the filter and the image surface is 8.77mm.
[0021] Compared with the prior art, the unmanned aerial vehicle 20° field of view near-infrared lens has the advantages that:
[0022] The unmanned aerial vehicle 20° field of view near-infrared lens has high imaging transfer function, low distortion, strong anti-interference performance, good detection and identification capability, good imaging clarity, and a fixed 20° field of view, and is suitable for large-range targets. BRIEF DESCRIPTION OF DRAWINGS
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the structure of the 20° field-of-view near-infrared lens for UAVs of this utility model.
[0025] In the figure, 1 is a plano-convex lens, 2 is a first biconvex lens, 3 is a first biconcave lens, 4 is a second biconcave lens, 5 is a plano-concave lens, 6 is a second biconvex lens, 7 is a third biconvex lens, 8 is a third biconcave lens, 9 is a window, 10 is a filter, and 11 is an aperture.
[0026] Figure 2 This is a full field-of-view diagram of the optical lens in Embodiment 1 of this utility model;
[0027] Figure 3 This is the maximum distortion diagram of the optical lens in Embodiment 1 of this utility model across the entire field of view. Detailed Implementation
[0028] To further understand this utility model, preferred embodiments of this utility model are described below. However, it should be understood that these descriptions are only for further illustrating the features and advantages of this utility model, and not for limiting the scope of the claims of this utility model.
[0029] like Figure 1 As shown, the 20° field-of-view near-infrared lens for UAVs of this utility model includes a plano-convex lens 1, a first biconvex lens 2, a first biconcave lens 3 (the first biconvex lens 2 and the first biconcave lens 3 form a first cemented doublet), a second biconcave lens 4, a plano-concave lens 5, a second biconvex lens 6 (the plano-concave lens 5 and the second biconvex lens 6 form a second cemented doublet), a third biconvex lens 7, a third biconcave lens 8, a window 9, and a filter 10, arranged coaxially from front to back along the direction of light propagation. Among them, the plano-convex lens 1, the first biconvex lens 2, the first biconcave lens 3, and the second biconcave lens 4 are set in front of the aperture 11, and the plano-concave lens 5, the second biconvex lens 6, the third biconvex lens 7, the third biconcave lens 8, the window 9, and the filter 10 are set behind the aperture 11. Light passes through plano-convex lens 1, first biconvex lens 2, first biconcave lens 3, and second biconcave lens 4 before entering the aperture 11. Then, it passes through plano-concave lens 5, second biconvex lens 6, third biconvex lens 7, third biconcave lens 8, window 9, and filter 10 before being imaged on the image plane.
[0030] In the above technical solution, the plano-convex lens 1 is made of H-FK61, with a front surface radius of curvature of 91.18 mm and a thickness of 16.52 mm. The first biconvex lens 2 is also made of H-FK61, with front and rear surface radii of curvature of -374.86 mm and 82.97 mm, respectively. The distance between the first biconvex lens 2 and the plano-convex lens 1 is 0.45 mm, and the thickness of the first biconvex lens 2 is 16.52 mm. The first biconcave lens 3 is made of H-LAK7, with front and rear surface radii of curvature of -175.34 mm and 131.55 mm, respectively. The thickness of the first biconcave lens 3 is 5.9 mm. The second biconcave lens 4 is made of H-K9L, with radii of curvature of -100.21 mm and 110.13 mm on its front and rear surfaces, respectively. The distance between the second biconcave lens 4 and the first biconcave lens 3 is 8.45 mm, the thickness of the second biconcave lens 4 is 5.31 mm, and the distance between the second biconcave lens 4 and the aperture stop 11 is 5.69 mm. The plano-concave lens 5 is made of H-QF50, with a radius of curvature of 343.57 mm on its rear surface. The distance between the plano-concave lens 5 and the aperture stop 11 is 1.31 mm, and the thickness of the plano-concave lens 5 is 5.07 mm. The second biconvex lens 6 is made of H-LAF1, with radii of curvature of 65.30 mm and -104.70 mm on its front and rear surfaces, respectively. The thickness of the second biconvex lens 6 is 14.16 mm. The third biconvex lens 7 is made of H-ZLAF60, with front and rear surface radii of curvature of 78.51 mm and -456.31 mm, respectively. The distance between the third biconvex lens 7 and the second biconvex lens 6 is 49.70 mm, and the thickness of the third biconvex lens 7 is 7.79 mm. The third biconcave lens 8 is also made of H-ZLAF60, with front and rear surface radii of curvature of -92.63 mm and 135.43 mm, respectively. The distance between the third biconcave lens 8 and the third biconvex lens 7 is 2.06 mm, and the thickness of the third biconcave lens 8 is 3.78 mm. The window 9 is made of SILICON, with a distance of 11.67 mm between the window 9 and the third biconcave lens 8, and a thickness of 2.36 mm. The filter 10 is made of SILICON. The distance between the filter 10 and the window 9 is 10.69 mm, the thickness of the filter 10 is 2.36 mm, and the distance between the filter 10 and the image plane is 8.77 mm. The filter 10 is used to filter out light in the non-near-infrared band.
[0031] The 20° field-of-view near-infrared lens for UAVs of this utility model may also include a lens barrel. The lens barrel is not particularly limited and can be used to fix the above-mentioned plano-convex lens 1, first biconvex lens 2, first biconcave lens 3, second biconcave lens 4, plano-concave lens 5, second biconvex lens 6, third biconvex lens 7, third biconcave lens 8, window 9 and filter 10.
[0032] The terms used in this utility model generally have the meanings commonly understood by those skilled in the art, unless otherwise stated.
[0033] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the embodiments.
[0034] In the following embodiments, various processes and methods not described in detail are conventional methods known in the art. Unless otherwise specified, the materials, reagents, apparatus, instruments, equipment, etc., used in the following embodiments are commercially available.
[0035] Example 1
[0036] The technical specifications of the optical lens are as follows: Dimensions: φ77×178.56; Back working distance: 35.85mm; Maximum aperture: φ77mm; MTF > 0.4@40lp / mm across the entire field of view; Maximum distortion < 1% across the entire field of view.
[0037] Based on the above technical specifications, the parameters (radius, curvature, thickness, spacing, material, etc.) of each optical element of the designed optical lens are shown in Table 1.
[0038] Table 1. Parameters of each optical element in the optical lens of Example 1
[0039]
[0040] Upon testing, the MTF of the optical lens in Example 1 across the entire field of view is as follows: Figure 2 As shown, the maximum distortion across the entire field of view is as follows: Figure 3 As shown, the optical lens of Example 1 exhibits a high imaging transfer function, low distortion, and good image clarity.
[0041] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the embodiments. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A 20° field-of-view near-infrared lens for unmanned aerial vehicles, characterized in that, It includes a plano-convex lens (1), a first biconvex lens (2), a first biconcave lens (3), a second biconcave lens (4), a plano-concave lens (5), a second biconvex lens (6), a third biconvex lens (7), a third biconcave lens (8), a window (9), and a filter (10) arranged coaxially along the direction of light propagation, and an aperture (11) is provided between the second biconcave lens (4) and the plano-concave lens (5); The first biconvex lens (2) and the first biconcave lens (3) form the first cemented doublet lens; The plano-concave lens (5) and the second biconvex lens (6) together form the second cemented doublet lens; The front surface of the plano-convex lens (1) has a radius of curvature of 91.18 mm and a thickness of 16.52 mm. The filter (10) is used to filter out light in the non-near-infrared band.
2. A 20° field-of-view near-infrared lens for a drone according to claim 1, characterized in that, The material of the plano-convex lens (1) is H-FK61.
3. A 20° field-of-view near-infrared lens for unmanned aerial vehicles according to claim 1, characterized in that, The material of the first biconvex lens (2) is H-FK61, and the radii of curvature of the front and rear surfaces are -374.86mm and 82.97mm, respectively. The distance between the first biconvex lens (2) and the plano-convex lens (1) is 0.45mm, and the thickness of the first biconvex lens (2) is 16.52mm. The first biconcave lens (3) is made of H-LAK7, and the radii of curvature of the front and rear surfaces are -175.34 mm and 131.55 mm, respectively. The thickness of the first biconcave lens (3) is 5.9 mm.
4. A 20° field-of-view near-infrared lens for a drone according to claim 1, characterized in that, The material of the second biconcave lens (4) is H-K9L, and the radii of curvature of the front and rear surfaces are -100.21mm and 110.13mm, respectively. The distance between the second biconcave lens (4) and the first biconcave lens (3) is 8.45mm, the thickness of the second biconcave lens (4) is 5.31mm, and the distance between the second biconcave lens (4) and the aperture surface (11) is 5.69mm.
5. A 20° field-of-view near-infrared lens for a drone according to claim 1, characterized in that, The plano-concave lens (5) is made of H-QF50, the radius of curvature of the rear surface is 343.57 mm, the distance between the plano-concave lens (5) and the aperture (11) is 1.31 mm, and the thickness of the plano-concave lens (5) is 5.07 mm. The material of the second biconvex lens (6) is H-LAF1, and the radii of curvature of the front and rear surfaces are 65.30 mm and -104.70 mm, respectively. The thickness of the second biconvex lens (6) is 14.16 mm.
6. A 20° field-of-view near-infrared lens for a drone according to claim 1, characterized in that, The material of the third biconvex lens (7) is H-ZLAF60, and the radii of curvature of the front and rear surfaces are 78.51 mm and -456.31 mm, respectively. The distance between the third biconvex lens (7) and the second biconvex lens (6) is 49.70 mm, and the thickness of the third biconvex lens (7) is 7.79 mm.
7. A 20° field-of-view near-infrared lens for a drone according to claim 1, characterized in that, The material of the third biconcave lens (8) is H-ZLAF60, and the radii of curvature of the front and rear surfaces are -92.63 mm and 135.43 mm, respectively. The distance between the third biconcave lens (8) and the third biconvex lens (7) is 2.06 mm, and the thickness of the third biconcave lens (8) is 3.78 mm.
8. A 20° field-of-view near-infrared lens for a drone according to claim 1, characterized in that, The material of the window (9) is SILICON, the distance between the window (9) and the third biconcave lens (8) is 11.67 mm, and the thickness of the window (9) is 2.36 mm.
9. A 20° field-of-view near-infrared lens for a drone according to claim 1, characterized in that, The material of the filter (10) is SILICON, the distance between the filter (10) and the window (9) is 10.69 mm, the thickness of the filter (10) is 2.36 mm, and the distance between the filter (10) and the image plane is 8.77 mm.