An aerial imaging system

Abstract

The application discloses an aerial imaging system, comprising: a front group lens, an aperture and a rear group lens arranged in sequence along the light propagation direction; the front group lens comprises a first negative meniscus lens, a first positive meniscus lens, a first double-concave lens and a first double-convex lens arranged in sequence along the light propagation direction; wherein the first double-concave lens and the first double-convex lens are tightly connected to form a first cemented group; the rear group lens comprises a second double-convex lens, a second double-concave lens, a second positive meniscus lens, a second negative meniscus lens, a third positive meniscus lens and a third double-convex lens arranged in sequence along the light propagation direction; wherein the second double-concave lens and the second positive meniscus lens are tightly connected to form a second cemented group; the first negative meniscus lens, the first positive meniscus lens, the first double-concave lens, the first double-convex lens, the second double-convex lens, the second double-concave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens and the third double-convex lens are all spherical lenses.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to an aerial imaging system. Background Technology

[0002] With the development of wireless image transmission technology, drones equipped with camera systems for aerial photography are gaining popularity and have huge market potential. Currently, aerial photography lenses on the market generally use multiple aspherical lenses or a combination of glass-plastic and aspherical lenses. However, the aspherical lenses of such lenses are difficult to process and costly, and they also have the common disadvantages of plastic lenses, such as excessive distortion in large field-of-view lenses, low image telecentricity, and a narrow temperature range. Summary of the Invention

[0003] In view of this, the present application provides an aerial imaging system to at least solve the above-mentioned technical problems existing in the prior art.

[0004] According to a first aspect of this application, embodiments of this application provide an aerial imaging system, including:

[0005] The front lens group, aperture, and rear lens group are arranged sequentially along the direction of light propagation.

[0006] The front lens group includes a first negative meniscus lens, a first positive meniscus lens, a first biconcave lens and a first biconvex lens arranged sequentially along the direction of light propagation; wherein the first biconcave lens and the first biconvex lens are closely connected to form a first cemented group;

[0007] The rear lens group includes a second biconvex lens, a second biconcave lens, a second positive meniscus lens, a second negative meniscus lens, a third positive meniscus lens, and a third biconvex lens arranged sequentially along the direction of light propagation; wherein, the second biconcave lens and the second positive meniscus lens are closely connected to form a second cemented lens group;

[0008] The first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are all spherical lenses.

[0009] Optionally, the thicknesses of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: 2mm~8mm, 3mm~11mm, 2mm~7mm, 3mm~10mm, 4mm~12mm, 2mm~5mm, 3mm~10mm, 2mm~7mm, 3mm~10mm, and 6mm~12mm.

[0010] Optionally, the air gap between the first negative meniscus lens and the first positive meniscus lens is 20mm to 30mm, the air gap between the first positive meniscus lens and the first cemented group is 14mm to 30mm, the air gap between the first cemented group and the aperture is 0.1mm to 6mm, the air gap between the aperture and the second biconvex lens is 0.1mm to 4mm, the air gap between the second biconvex lens and the second cemented group is 2mm to 11mm, the air gap between the second cemented group and the second negative meniscus lens is 18mm to 26mm, the air gap between the second negative meniscus lens and the third positive meniscus lens is 0.1mm to 3mm, and the air gap between the third positive meniscus lens and the third biconvex lens is 0.1mm to 2.3mm.

[0011] Optionally, the materials of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: quartz glass, colorless optical glass HLAF1, colorless optical glass HZLAF53B, colorless optical glass HZF6, colorless optical glass HLAK1, colorless optical glass HLAF1, colorless optical glass HFK61, colorless optical glass HF1, colorless optical glass HZLAF53B, and colorless optical glass HLAK4L.

[0012] Optionally, along the direction of light propagation, the radii of curvature of the front and rear surfaces of the first negative meniscus lens are 260mm–360mm and 34mm–41mm, respectively; the radii of curvature of the front and rear surfaces of the first positive meniscus lens are 68mm–80mm and 350mm–1060mm, respectively; the radii of curvature of the front and rear surfaces of the first biconcave lens are -94mm–-166mm and 32mm–38mm, respectively; the radii of curvature of the front and rear surfaces of the first biconvex lens are 32mm–38mm and -52mm–-66mm, respectively; and the radii of curvature of the front and rear surfaces of the second biconvex lens are 22mm–30mm and -230mm–-7mm, respectively. The first biconcave lens has a radius of curvature of -120mm to -160mm and 16mm to 23mm on its front and rear surfaces, respectively; the second positive meniscus lens has a radius of curvature of 16mm to 23mm and 52mm to 64mm on its front and rear surfaces, respectively; the second negative meniscus lens has a radius of curvature of -12mm to -23mm and -72mm to -90mm on its front and rear surfaces, respectively; the third positive meniscus lens has a radius of curvature of -79mm to -93mm and -33mm to -47mm on its front and rear surfaces, respectively; and the third biconvex lens has a radius of curvature of 42mm to 55mm and -280mm to -880mm on its front and rear surfaces, respectively.

[0013] Optionally, the materials of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: quartz glass, colorless optical glass HZLAF76, colorless optical glass HZLAF53B, colorless optical glass HZK50, colorless optical glass HLAF50B, colorless optical glass HLAF1, colorless optical glass HQF50, colorless optical glass 1HZK10L, colorless optical glass HZLAF53B, and colorless optical glass HLAK6A.

[0014] Optionally, along the direction of light propagation, the radii of curvature of the front and rear surfaces of the first negative meniscus lens are 290mm–450mm and 31mm–37mm, respectively; the radii of curvature of the front and rear surfaces of the first positive meniscus lens are 57mm–69mm and 131mm–183mm, respectively; the radii of curvature of the front and rear surfaces of the first biconcave lens are -320mm–-430mm and 29mm–37mm, respectively; the radii of curvature of the front and rear surfaces of the first biconvex lens are 29mm–37mm and -61mm–-75mm, respectively; and the radii of curvature of the front and rear surfaces of the second biconvex lens are 28mm–36mm and -141mm–-1, respectively. The first biconcave lens has a radius of curvature of -111mm to -141mm and 21mm to 28mm on its front and rear surfaces, respectively; the second positive meniscus lens has a radius of curvature of 21mm to 28mm and 31mm to 37mm on its front and rear surfaces, respectively; the second negative meniscus lens has a radius of curvature of -15mm to -19mm and -56mm to -80mm on its front and rear surfaces, respectively; the third positive meniscus lens has a radius of curvature of -31mm to -40mm and 39mm to 50mm on its front and rear surfaces, respectively; and the third biconvex lens has a radius of curvature of 41mm to 48mm and -1331mm to -2237mm on its front and rear surfaces, respectively.

[0015] Optionally, the aerial imaging system also includes:

[0016] Filter; along the direction of light propagation, the filter is positioned behind the third biconvex lens.

[0017] Optionally, the air gap between the third biconvex lens and the filter is 0.2 mm to 5 mm.

[0018] Optionally, the aerial imaging system also includes:

[0019] Lens tube; the front lens group, aperture, and rear lens group are housed inside the lens tube.

[0020] The aerial imaging system provided in this application embodiment comprises a front lens group, an aperture, and a rear lens group arranged sequentially along the direction of light propagation. The front lens group includes a first negative meniscus lens, a first positive meniscus lens, a first biconcave lens, and a first biconvex lens arranged sequentially along the direction of light propagation; wherein the first biconcave lens and the first biconvex lens are closely connected to form a first cemented lens group. The rear lens group includes a second biconvex lens, a second biconcave lens, a second positive meniscus lens, a second negative meniscus lens, a third positive meniscus lens, and a third biconvex lens arranged sequentially along the direction of light propagation; wherein the second biconcave lens and the second positive meniscus lens... The meniscus lenses are closely joined to form the second cemented group; the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are all spherical lenses; thus, the front and rear lens groups of the aerial imaging system both use spherical lenses, which is less difficult to manufacture but more expensive; it also makes the aerial imaging system telecentric in shape, which can improve the measurement accuracy and field of view of aerial images taken by the lens; and it can also enable the entire aerial imaging system to be used at very high temperatures.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an aerial imaging system according to an embodiment of this application;

[0023] Figure 2 This is an optical dot plot of an aerial imaging system at +20°C in an embodiment of this application;

[0024] Figure 3 This is an optical transfer function diagram of an aerial imaging system at +20°C in an embodiment of this application;

[0025] Figure 4 This is an optical distortion diagram of the aerial imaging system at +20°C in the embodiments of this application;

[0026] Figure 5 This is an optical dot plot of the aerial imaging system at -40℃ in the embodiments of this application;

[0027] Figure 6 This is an optical transfer function diagram of the aerial imaging system at -40℃ in an embodiment of this application;

[0028] Figure 7 This is an optical dot plot of the aerial imaging system at +60°C in the embodiments of this application;

[0029] Figure 8 This is an optical transfer function diagram of the aerial imaging system at +60°C in an embodiment of this application;

[0030] Figure 9 This is an optical dot plot of another aerial imaging system at +20°C in an embodiment of this application;

[0031] Figure 10 This is an optical transfer function diagram of another aerial imaging system at +20°C in an embodiment of this application.

[0032] Figure 11 This is an optical distortion diagram of another aerial imaging system at +20°C in an embodiment of this application. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] This application provides an aerial imaging system, such as... Figure 1 As shown, it includes:

[0035] The front lens group, aperture, and rear lens group are arranged sequentially along the direction of light propagation.

[0036] The front lens group includes a first negative meniscus lens 11, a first positive meniscus lens 12, a first biconcave lens 13, and a first biconvex lens 14 arranged sequentially along the direction of light propagation; wherein the first biconcave lens 13 and the first biconvex lens 14 are closely connected to form a first cemented group;

[0037] The rear lens group includes a second biconvex lens 15, a second biconcave lens 16, a second positive meniscus lens 17, a second negative meniscus lens 18, a third positive meniscus lens 19, and a third biconvex lens 20 arranged sequentially along the direction of light propagation; wherein, the second biconcave lens 16 and the second positive meniscus lens 17 are closely connected to form a second cemented lens group.

[0038] The first negative meniscus lens 11, the first positive meniscus lens 12, the first biconcave lens 13, the first biconvex lens 14, the second biconvex lens 15, the second biconcave lens 16, the second positive meniscus lens 17, the second negative meniscus lens 18, the third positive meniscus lens 19, and the third biconvex lens 20 are all spherical lenses.

[0039] In specific implementation, such as Figure 1As shown, the aerial imaging system also includes a filter and a target surface. Along the direction of light propagation, the filter is positioned behind the third biconvex lens, and the target surface is positioned behind the filter. The filter thickness is 2mm to 7mm. The air gap between the third biconvex lens 20 and the filter can be 0.2mm to 5mm, and the air gap between the filter and the target surface can be 9mm to 16mm.

[0040] In some embodiments, the aerial imaging system further includes a telescope barrel; wherein the front lens group, aperture stop, and rear lens group are disposed within the telescope barrel. The telescope barrel can be made of aluminum alloy. Using an aluminum alloy telescope barrel enables the entire aerial imaging system to perform imaging at temperatures ranging from -40°C to +60°C, while maintaining image quality that meets usage requirements.

[0041] In some embodiments, the thicknesses of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: 2mm~8mm, 3mm~11mm, 2mm~7mm, 3mm~10mm, 4mm~12mm, 2mm~5mm, 3mm~10mm, 2mm~7mm, 3mm~10mm, and 6mm~12mm.

[0042] In some embodiments, the air gap between the first negative meniscus lens and the first positive meniscus lens is 20mm to 30mm, the air gap between the first positive meniscus lens and the first cemented assembly is 14mm to 30mm, the air gap between the first cemented assembly and the aperture is 0.1mm to 6mm, the air gap between the aperture and the second biconvex lens is 0.1mm to 4mm, the air gap between the second biconvex lens and the second cemented assembly is 2mm to 11mm, the air gap between the second cemented assembly and the second negative meniscus lens is 18mm to 26mm, the air gap between the second negative meniscus lens and the third positive meniscus lens is 0.1mm to 3mm, and the air gap between the third positive meniscus lens and the third biconvex lens is 0.1mm to 2.3mm.

[0043] The aerial imaging system provided in this application embodiment comprises a front lens group, an aperture, and a rear lens group arranged sequentially along the direction of light propagation. The front lens group includes a first negative meniscus lens, a first positive meniscus lens, a first biconcave lens, and a first biconvex lens arranged sequentially along the direction of light propagation; wherein the first biconcave lens and the first biconvex lens are closely connected to form a first cemented lens group. The rear lens group includes a second biconvex lens, a second biconcave lens, a second positive meniscus lens, a second negative meniscus lens, a third positive meniscus lens, and a third biconvex lens arranged sequentially along the direction of light propagation; wherein the second biconcave lens and the second positive meniscus lens... The meniscus lenses are closely joined to form the second cemented group; the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are all spherical lenses; thus, the front and rear lens groups of the aerial imaging system both use spherical lenses, which is less difficult to manufacture but more expensive; it also makes the aerial imaging system telecentric in shape, which can improve the measurement accuracy and field of view of aerial images taken by the lens; and it can also enable the entire aerial imaging system to be used at very high temperatures.

[0044] In an optional embodiment, as shown in Table 1, the materials of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: quartz glass (SILICA), colorless optical glass HLAF1, colorless optical glass HZLAF53B, colorless optical glass HZF6, colorless optical glass HLAK1, colorless optical glass HLAF1, colorless optical glass HFK61, colorless optical glass HF1, colorless optical glass HZLAF53B, and colorless optical glass HLAK4L.

[0045] In this embodiment, as shown in Table 1, the air gap between the first negative meniscus lens and the first positive meniscus lens is 20mm to 30mm, the air gap between the first positive meniscus lens and the first cemented assembly is 20mm to 30mm, the air gap between the first cemented assembly and the aperture is 0.1mm to 3mm, the air gap between the aperture and the second biconvex lens is 0.1mm to 4mm, the air gap between the second biconvex lens and the second cemented assembly is 4mm to 11mm, the air gap between the second cemented assembly and the second negative meniscus lens is 18mm to 26mm, the air gap between the second negative meniscus lens and the third positive meniscus lens is 0.2mm to 3mm, and the air gap between the third positive meniscus lens and the third biconvex lens is 0.1mm to 2mm.

[0046] Table 1

[0047]

[0048]

[0049] Note: The units for radius of curvature, thickness, diameter, and air gap are mm.

[0050] As shown in Table 1, the air gap between the third biconvex lens 20 and the filter can be 0.2mm to 5mm, and the air gap between the filter and the target surface can be 9mm to 16mm. Along the direction of light propagation, the radii of curvature of the front and rear surfaces of the first negative meniscus lens are 260mm to 360mm and 34mm to 41mm, respectively; the radii of curvature of the front and rear surfaces of the first positive meniscus lens are 68mm to 80mm and 350mm to 1060mm, respectively; the radii of curvature of the front and rear surfaces of the first biconcave lens are -94mm to -166mm and 32mm to 38mm, respectively; the radii of curvature of the front and rear surfaces of the first biconvex lens are 32mm to 38mm and -52mm to -66mm, respectively; and the radii of curvature of the front and rear surfaces of the second biconvex lens are 22mm to 30mm and -230mm to -730mm, respectively. mm; the radii of curvature of the front and rear surfaces of the second biconcave lens are -120mm to -160mm and 16mm to 23mm, respectively; the radii of curvature of the front and rear surfaces of the second positive meniscus lens are 16mm to 23mm and 52mm to 64mm, respectively; the radii of curvature of the front and rear surfaces of the second negative meniscus lens are -12mm to -23mm and -72mm to -90mm, respectively; the radii of curvature of the front and rear surfaces of the third positive meniscus lens are -79mm to -93mm and -33mm to -47mm, respectively; the radii of curvature of the front and rear surfaces of the third biconvex lens are 42mm to 55mm and -280mm to -880mm, respectively.

[0051] In a more specific implementation, the parameters of each lens in the aerial imaging system (such as radius of curvature, thickness, material, aperture, etc.) are shown in Table 2.

[0052] Table 2

[0053]

[0054] Note: The units for radius of curvature, thickness, diameter, and air gap are mm.

[0055] In this embodiment, by using the materials of these lenses as shown in Table 1 or Table 2, and by adjusting the air gap between each lens, the transfer function of the lens optical system can ultimately reach the system diffraction limit, ensuring excellent image quality. With an aluminum alloy lens barrel, the entire imaging system can meet the image quality requirements for use at temperatures ranging from -40°C to +60°C.

[0056] In this embodiment, the optical dot pattern of the aerial imaging system at +20°C is as follows: Figure 2 As shown. The optical transfer function diagram of the aerial imaging system at +20℃ is as follows. Figure 3 As shown. Optical distortion diagram of the aerial imaging system at +20℃. Figure 4 As shown. The optical point array diagram of the aerial imaging system at -40℃ is as follows. Figure 5 As shown. The optical transfer function diagram of the aerial imaging system at -40℃ is as follows. Figure 6 As shown. The optical point array diagram of the aerial imaging system at +60℃ is as follows. Figure 7 As shown. The optical transfer function diagram of the aerial imaging system at +60℃ is as follows. Figure 8 As shown. From Figure 2-8 It can be seen that the aerial imaging system can operate in a wide range of ambient temperatures from -40℃ to +60℃, and the imaging quality meets the requirements.

[0057] The aerial imaging system provided in this application embodiment can achieve the following performance indicators:

[0058] a) Focal length: 57.0mm;

[0059] b) F / #: 3.6;

[0060] c) Band: 0.486~0.656um;

[0061] d) Field of view: ±18.6°;

[0062] e) Distortion: <0.04%;

[0063] f) MTF: >0.20@134lp / mm;

[0064] g) Operating temperature: -40℃~+60℃.

[0065] The aerial imaging system provided in this application adopts a different structural form than before, using spherical lenses throughout. While maintaining a simple structure, it achieves the requirements of a large field of view and excellent imaging quality. Furthermore, the lens optical structure with a telecentric image side improves the measurement accuracy of aerial images. Through optimized design of the aerial imaging system, it can operate normally and maintain excellent image quality in harsh environmental temperatures ranging from -40℃ to +60℃.

[0066] In an optional embodiment, as shown in Table 3, the materials of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: quartz glass, colorless optical glass HZLAF76, colorless optical glass HZLAF53B, colorless optical glass HZK50, colorless optical glass HLAF50B, colorless optical glass HLAF1, colorless optical glass HQF50, colorless optical glass 1HZK10L, colorless optical glass HZLAF53B, and colorless optical glass HLAK6A.

[0067] In this embodiment, as shown in Table 3, the air gap between the first negative meniscus lens and the first positive meniscus lens is 20mm to 30mm, the air gap between the first positive meniscus lens and the first cemented assembly is 14mm to 25mm, the air gap between the first cemented assembly and the aperture is 0.2mm to 6mm, the air gap between the aperture and the second biconvex lens is 0.1mm to 3mm, the air gap between the second biconvex lens and the second cemented assembly is 2mm to 6mm, the air gap between the second cemented assembly and the second negative meniscus lens is 21mm to 26mm, the air gap between the second negative meniscus lens and the third positive meniscus lens is 0.1mm to 2.6mm, and the air gap between the third positive meniscus lens and the third biconvex lens is 0.1mm to 2.3mm.

[0068] As shown in Table 3, along the direction of light propagation, the radii of curvature of the front and rear surfaces of the first negative meniscus lens are 290mm~450mm and 31mm~37mm, respectively; the radii of curvature of the front and rear surfaces of the first positive meniscus lens are 57mm~69mm and 131mm~183mm, respectively; the radii of curvature of the front and rear surfaces of the first biconcave lens are -320mm~-430mm and 29mm~37mm, respectively; the radii of curvature of the front and rear surfaces of the first biconvex lens are 29mm~37mm and -61mm~-75mm, respectively; and the radii of curvature of the front and rear surfaces of the second biconvex lens are 28mm~36mm and -141mm~- The first biconcave lens has a curvature of 180mm; the second biconcave lens has radii of curvature of -111mm to -141mm and 21mm to 28mm on its front and rear surfaces, respectively; the second positive meniscus lens has radii of curvature of 21mm to 28mm and 31mm to 37mm on its front and rear surfaces, respectively; the second negative meniscus lens has radii of curvature of -15mm to -19mm and -56mm to -80mm on its front and rear surfaces, respectively; the third positive meniscus lens has radii of curvature of -31mm to -40mm and 39mm to 50mm on its front and rear surfaces, respectively; and the third biconvex lens has radii of curvature of 41mm to 48mm and -1331mm to -2237mm on its front and rear surfaces, respectively.

[0069] Table 3

[0070]

[0071]

[0072] Note: The units for radius of curvature, thickness, diameter, and air gap are mm.

[0073] In a more specific implementation, the parameters of each lens in the aerial imaging system (such as radius of curvature, thickness, material, aperture, etc.) are shown in Table 4.

[0074] Table 4

[0075]

[0076]

[0077] Note: The units for radius of curvature, thickness, diameter, and air gap are mm.

[0078] In this embodiment, the materials of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively quartz glass, colorless optical glass HZLAF76, colorless optical glass HZLAF53B, colorless optical glass HZK50, colorless optical glass HLAF50B, colorless optical glass HLAF1, colorless optical glass HQF50, colorless optical glass 1HZK10L, colorless optical glass HZLAF53B, and colorless optical glass HLAK6A. By adjusting the air gap between each lens, the transfer function of the lens optical system can ultimately reach the system diffraction limit, ensuring excellent image quality. With an aluminum alloy lens barrel, the entire imaging system can meet the image quality requirements at temperatures ranging from -40°C to +60°C.

[0079] In this embodiment, the optical dot pattern of the aerial imaging system at +20°C is as follows: Figure 9 As shown. The optical transfer function diagram of the aerial imaging system at +20℃ is as follows. Figure 10 As shown. Optical distortion diagram of the aerial imaging system at +20℃. Figure 11 As shown.

[0080] The aerial imaging system provided in this application embodiment can achieve the following performance indicators:

[0081] a) Focal length: 57.03mm;

[0082] b) F / #: 3.6;

[0083] c) Band: 0.486~0.656um;

[0084] d) Field of view: ±18.6°;

[0085] e) Distortion: <0.02%;

[0086] f) MTF: >0.15@134lp / mm;

[0087] g) Operating temperature: -40℃~+60℃.

[0088] The aerial imaging system provided in this application adopts a different structural form than before, using spherical lenses throughout. While maintaining a simple structure, it achieves the requirements of a large field of view and excellent imaging quality. Furthermore, the lens optical structure with a telecentric image side improves the measurement accuracy of aerial images. Through optimized design of the aerial imaging system, it can operate normally and maintain excellent image quality in harsh environmental temperatures ranging from -40℃ to +60℃.

[0089] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0091] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0092] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An aerial imaging system, characterized in that, include: The front lens group, aperture stop, and rear lens group are arranged sequentially along the direction of light propagation. The front lens group includes a first negative meniscus lens, a first positive meniscus lens, a first biconcave lens, and a first biconvex lens arranged sequentially along the light propagation direction; wherein the first biconcave lens and the first biconvex lens are closely connected to form a first cemented lens group; The rear lens group includes a second biconvex lens, a second biconcave lens, a second positive meniscus lens, a second negative meniscus lens, a third positive meniscus lens, and a third biconvex lens arranged sequentially along the light propagation direction; wherein, the second biconcave lens and the second positive meniscus lens are closely connected to form a second cemented lens group; The first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are all spherical lenses; The thicknesses of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: 2 mm to 8 mm, 3 mm to 11 mm, 2 mm to 7 mm, 3 mm to 10 mm, 4 mm to 12 mm, 2 mm to 5 mm, 3 mm to 10 mm, 2 mm to 7 mm, 3 mm to 10 mm, and 6 mm to 12 mm. The air gap between the first negative meniscus lens and the first positive meniscus lens is 20 mm to 30 mm, the air gap between the first positive meniscus lens and the first cemented assembly is 14 mm to 30 mm, the air gap between the first cemented assembly and the aperture is 0.1 mm to 6 mm, the air gap between the aperture and the second biconvex lens is 0.1 mm to 4 mm, the air gap between the second biconvex lens and the second cemented assembly is 2 mm to 11 mm, the air gap between the second cemented assembly and the second negative meniscus lens is 18 mm to 26 mm, the air gap between the second negative meniscus lens and the third positive meniscus lens is 0.1 mm to 3 mm, and the air gap between the third positive meniscus lens and the third biconvex lens is 0.1 mm to 2.3 mm.

2. The aerial imaging system according to claim 1, characterized in that, The materials of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: quartz glass, colorless optical glass HLAF1, colorless optical glass HZLAF53B, colorless optical glass HZF6, colorless optical glass HLAK1, colorless optical glass HLAF1, colorless optical glass HFK61, colorless optical glass HF1, colorless optical glass HZLAF53B, and colorless optical glass HLAK4L.

3. The aerial imaging system according to claim 2, characterized in that, Along the direction of light propagation, the radii of curvature of the front and rear surfaces of the first negative meniscus lens are 260 mm to 360 mm and 34 mm to 41 mm, respectively; the radii of curvature of the front and rear surfaces of the first positive meniscus lens are 68 mm to 80 mm and 350 mm to 1060 mm, respectively; the radii of curvature of the front and rear surfaces of the first biconcave lens are -94 mm to -166 mm and 32 mm to 38 mm, respectively; the radii of curvature of the front and rear surfaces of the first biconvex lens are 32 mm to 38 mm and -52 mm to -66 mm, respectively; the radii of curvature of the front and rear surfaces of the second biconvex lens are 22 mm to 30 mm and -230 mm to -730 mm, respectively; the radii of curvature of the front and rear surfaces of the second biconcave lens are -120 mm to -160 mm and 16 mm to 23 mm, respectively; the radii of curvature of the front and rear surfaces of the second positive meniscus lens are 16 mm to 23 mm and 52 mm to 64 mm, respectively; and the radii of curvature of the front and rear surfaces of the second negative meniscus lens are -12 mm to -23 mm and -72 mm to -90 mm, respectively. mm; the radii of curvature of the front and rear surfaces of the third positive meniscus lens are -79 mm to -93 mm and -33 mm to -47 mm, respectively; the radii of curvature of the front and rear surfaces of the third biconvex lens are 42 mm to 55 mm and -280 mm to -880 mm, respectively.

4. The aerial imaging system according to claim 1, characterized in that, The materials of the first negative meniscus lens, the first positive meniscus lens, the first biconcave lens, the first biconvex lens, the second biconvex lens, the second biconcave lens, the second positive meniscus lens, the second negative meniscus lens, the third positive meniscus lens, and the third biconvex lens are respectively: quartz glass, colorless optical glass HZLAF76, colorless optical glass HZLAF53B, colorless optical glass HZK50, colorless optical glass HLAF50B, colorless optical glass HLAF1, colorless optical glass HQF50, colorless optical glass 1HZK10L, colorless optical glass HZLAF53B, and colorless optical glass HLAK6A.

5. The aerial imaging system according to claim 4, characterized in that, Along the direction of light propagation, the radii of curvature of the front and rear surfaces of the first negative meniscus lens are 290 mm to 450 mm and 31 mm to 37 mm, respectively; the radii of curvature of the front and rear surfaces of the first positive meniscus lens are 57 mm to 69 mm and 131 mm to 183 mm, respectively; the radii of curvature of the front and rear surfaces of the first biconcave lens are -320 mm to -430 mm and 29 mm to 37 mm, respectively; the radii of curvature of the front and rear surfaces of the first biconvex lens are 29 mm to 37 mm and -61 mm to -75 mm, respectively; the radii of curvature of the front and rear surfaces of the second biconvex lens are 28 mm to 36 mm and -141 mm to -180 mm, respectively; the radii of curvature of the front and rear surfaces of the second biconcave lens are -111 mm to -141 mm and 21 mm to 28 mm, respectively; the radii of curvature of the front and rear surfaces of the second positive meniscus lens are 21 mm to 28 mm and 31 mm to 37 mm, respectively; and the radii of curvature of the front and rear surfaces of the second negative meniscus lens are -15 mm to -19 mm and -56 mm to -80 mm, respectively. mm; the radii of curvature of the front and rear surfaces of the third positive meniscus lens are -31 mm to -40 mm and 39 mm to 50 mm, respectively; the radii of curvature of the front and rear surfaces of the third biconvex lens are 41 mm to 48 mm and -1331 mm to -2237 mm, respectively.

6. The aerial imaging system according to claim 1, characterized in that, Also includes: Filters; Along the direction of light propagation, the filter is positioned after the third biconvex lens.

7. The aerial imaging system according to claim 6, characterized in that, The air gap between the third biconvex lens and the filter is 0.2 mm to 5 mm.

8. The aerial imaging system according to claim 1, characterized in that, Also includes: Lens tube; the front lens group, aperture, and rear lens group are disposed inside the lens tube.

Images