An ultra-high-definition large-target-fish-eye-lens and electronic equipment

Abstract

The application discloses an ultra-high-definition large-target-fish-eye lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the direction of the optical axis from the object side to the image side. The lens adopts a ten-piece design, and a fish-eye lens with a focal length of 2.9mm is realized. The total optical length is controlled within 30.3mm, the maximum outer diameter of the lens is less than 24.5mm, the maximum field of view of the lens can reach 198°, the relative luminance of the full field of view is greater than 67%, and the field of view utilization rate is high. The off-axis chromatic aberration value of the lens is less than 3um, the color difference restoration degree of the image is high, and the purple edge can be effectively inhibited.

Description

An ultra-high-definition large-format fisheye lens and electronic device Technical Field

[0001] This invention relates to the field of ultra-high-definition large-format fisheye lens technology, and more particularly to an ultra-high-definition large-format fisheye lens and electronic device. Background Technology

[0002] A fisheye lens is a wide-angle lens with a special optical design, capable of presenting an extremely wide field of view and minimal distortion, capturing a very broad range of images. Fisheye lenses can be used in security monitoring, panoramic simulation, and dome projection, among other applications. Compared to other imaging systems, fisheye lenses offer advantages such as light weight and small size. However, most existing fisheye lenses suffer from one or more of the following drawbacks:

[0003] Firstly, existing fisheye lenses have a small field of view, a small observation range, and insufficient image capture area;

[0004] Secondly, existing fisheye lenses have low resolution and poor clarity;

[0005] Thirdly, existing fisheye lenses have poor color reproduction during the imaging process. Summary of the Invention

[0006] In view of this, the object of the present invention is to provide an ultra-high-definition large-aperture fisheye lens and electronic device. This lens can at least solve one of the technical shortcomings mentioned in the background art.

[0007] According to one aspect of the present invention, an ultra-high-definition large-surface fisheye lens is provided, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object side to the image side;

[0008] The first lens has negative refractive power, the object side of the first lens is convex, and the image side of the first lens is concave.

[0009] The second lens has negative refractive power, the object side of the second lens is convex, and the image side of the second lens is concave.

[0010] The third lens has negative refractive power, the object side of the third lens is concave, and the image side of the third lens is either convex or concave.

[0011] The fourth lens has positive refractive power, and the object side of the fourth lens is concave or convex, while the image side of the fourth lens is convex.

[0012] The fifth lens has positive diopter, the object side of the fifth lens is convex, and the image side of the fifth lens is flat.

[0013] The sixth lens has negative refractive power, the object side of the sixth lens is concave, and the image side of the sixth lens is convex.

[0014] The seventh lens has positive diopter, and the object-side surface of the seventh lens is convex, as is the image-side surface of the seventh lens;

[0015] The eighth lens has negative refractive power, and the object side of the eighth lens is concave, and the image side of the eighth lens is concave.

[0016] The ninth lens has positive diopter, and the object-side surface of the ninth lens is convex, and the image-side surface of the ninth lens is convex.

[0017] The tenth lens has positive diopter, and the object-side surface of the tenth lens is convex, while the image-side surface of the ninth lens is convex.

[0018] This invention utilizes a ten-element design to create a fisheye lens with a focal length of 2.9mm. The total optical length is controlled within 30.3mm, the maximum outer diameter of the lens is less than 24.5mm, the maximum field of view reaches 198°, and the relative illumination across the entire field of view is greater than 67%, resulting in high field-of-view utilization. The lens exhibits a transverse chromatic aberration value of less than 3µm, ensuring high color accuracy and effectively suppressing purple fringing.

[0019] According to another aspect of the present invention, an electronic device is provided, comprising the aforementioned ultra-high-definition large-aperture fisheye lens; and an image sensor configured to receive an image formed by the ultra-high-definition large-aperture fisheye lens. In this technical solution, the advantages of the electronic device rely on the ultra-high-definition large-aperture fisheye lens, which will not be elaborated upon here. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 is a structural diagram of the optical system of the lens in Example 1.

[0022] Figure 2 shows the MTF diagram of Example 1 in the visible light band.

[0023] Figure 3 shows the optical distortion and field curvature diagram of Example 1.

[0024] Figure 4 is a vertical axis color difference diagram of Example 1.

[0025] Figure 5 is a relative illumination diagram of Example 1.

[0026] Figure 6 is a structural diagram of the optical system of the lens in Example 2.

[0027] Figure 7 shows the MTF diagram of Example 2 in the visible light band.

[0028] Figure 8 shows the optical distortion and field curvature diagram of Example 2.

[0029] Figure 9 is a vertical axis color difference diagram of Example 2.

[0030] Figure 10 is a relative illumination diagram of Example 2.

[0031] Figure 11 is a schematic diagram of the structure of the electronic device of the present invention.

[0032] L1, First lens; L2, Second lens; L3, Third lens; L4, Fourth lens; L5, Fifth lens; L6, Sixth lens; L7, Seventh lens; L8, Eighth lens; L9, Ninth lens; L10, Tenth lens; ST, Aperture stop; G, Protective glass; IMA, Imaging plane. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The purpose of this invention is to provide an ultra-high-definition large-surface fisheye lens, characterized in that it comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object side to the image side, with an aperture stop provided between the sixth lens and the seventh lens;

[0035] The first lens has negative refractive power, the object side of the first lens is convex, and the image side of the first lens is concave.

[0036] The second lens has negative refractive power, the object side of the second lens is convex, and the image side of the second lens is concave.

[0037] The third lens has negative refractive power, the object side of the third lens is concave, and the image side of the third lens is either convex or concave.

[0038] The fourth lens has positive refractive power, and the object side of the fourth lens is concave or convex, while the image side of the fourth lens is convex.

[0039] The fifth lens has positive diopter, the object side of the fifth lens is convex, and the image side of the fifth lens is flat.

[0040] The sixth lens has negative refractive power, the object side of the sixth lens is concave, and the image side of the sixth lens is convex.

[0041] The seventh lens has positive diopter, and the object-side surface of the seventh lens is convex, as is the image-side surface of the seventh lens;

[0042] The eighth lens has negative refractive power, and the object side of the eighth lens is concave, and the image side of the eighth lens is concave.

[0043] The ninth lens has positive diopter, and the object-side surface of the ninth lens is convex, and the image-side surface of the ninth lens is convex.

[0044] The tenth lens has positive diopter, and the object-side surface of the tenth lens is convex, while the image-side surface of the ninth lens is convex.

[0045] Referring to Figures 1 and 6, the first lens is designated L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the aperture stop is designated ST, the protective glass is designated G, and the imaging plane is designated IMA.

[0046] Specifically, in Embodiment 1, the image-side surface of the third lens is convex, and the object-side surface of the fourth lens is concave. The third and fourth lenses are cemented lenses.

[0047] Specifically, in embodiment 2, the image-side surface of the third lens is concave, and the object-side surface of the fourth lens is convex. The third and fourth lenses are cemented lenses.

[0048] As one embodiment, the lens satisfies the following relationships: Nd1 ≥ 2; 11 < |f1| < 16; where Nd1 is the refractive index of the first lens and f1 is the focal length of the first lens. The beneficial effect of this embodiment is that by satisfying the above equation with the first lens, light can be bent more effectively, thereby achieving a greater light-gathering capability at a shorter focal length, which can improve image brightness and clarity, and is beneficial for controlling the maximum aperture of the system.

[0049] As one embodiment, the lens satisfies the following relationship: |Vd8-Vd7|>28; where Vd7 is the Abbe number of the seventh lens, Vd8 is the Abbe coefficient of the eighth lens, and the seventh and eighth lenses are a cemented lens group. The beneficial effect of this embodiment is that by setting the aperture with a cemented seventh and eighth lens, and by selecting seventh and eighth lenses with significantly different Abbe numbers, not only can chromatic aberration be effectively corrected, but it also greatly helps to improve the image sharpness of the off-axis field of view.

[0050] As one embodiment, the lens satisfies the following relationship: 0.10 < BFL / TTL < 0.12, where BFL is the optical back focal length of the lens and TTL is the total optical length of the lens. The beneficial effect of this embodiment is that by satisfying the above relationship, the lens can achieve a shorter total length while maintaining a certain back focal length, which is conducive to the compact design and miniaturization of the lens system, facilitating installation and use in various devices.

[0051] As one embodiment, the lens satisfies the following relationship: 1.0 < BFL / f < 1.3; where BFL is the optical rear focal length of the lens, and f is the total optical focal length of the lens. The beneficial effect of this embodiment is that by satisfying the above relationship, a reasonable BFL to f ratio allows the lens to better match imaging sensors of different sizes, ensuring the consistency and stability of imaging effects, and improving the versatility and adaptability of the lens.

[0052] As one embodiment, the lens satisfies the following relationship:

[0053] The absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens satisfies the following relationship: 3≤ f1 / f ≤6;

[0054] The focal length of the second lens The absolute value of the ratio to the overall focal length f of the lens satisfies the following relationship: 2 ≤ f2 / f ≤4;

[0055] The absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens satisfies the following relationship: 1.5 ≤ f3 / f ≤3.5;

[0056] The absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens satisfies the following relationship: 2.76 ≤ f4 / f ≤5;

[0057] The absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens satisfies the following relationship: 2≤ f5 / f ≤3;

[0058] The absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens satisfies the following relationship: 10 ≤ f6 / f ≤16;

[0059] The absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens satisfies the following relationship: 1≤ f7 / f ≤2;

[0060] The absolute value of the ratio of the focal length f8 of the eighth lens to the overall focal length f of the lens satisfies the following relationship: 0.5 ≤ f8 / f ≤1.5;

[0061] The absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens satisfies the following relationship: 3≤ f9 / f ≤4;

[0062] The focal length f of the tenth lens 10 The absolute value of the ratio to the overall focal length f of the lens satisfies the following relationship: 4 ≤ f 10 / f ≤6.

[0063] The beneficial effect of the above embodiments is that by reasonably allocating the focal length values ​​of each lens, the combined focal length of the lens is reduced, making the lens structure compact and realizing lens miniaturization.

[0064] In Embodiment 1, the sixth, ninth, and tenth lenses are aspherical glass lenses. The beneficial effect of this embodiment is that by selecting aspherical glass lenses, aberrations, especially spherical and coma, can be effectively corrected, thereby improving the lens's resolution and contrast, resulting in clearer and sharper images.

[0065] In Embodiment 2, the second, sixth, and tenth lenses are aspherical glass lenses. The beneficial effect of this embodiment is that by selecting aspherical glass lenses, aberrations, especially spherical and coma, can be effectively corrected, thereby improving the lens's resolution and contrast, resulting in clearer and sharper images.

[0066] As one embodiment, the lens satisfies the following relationship:

[0067] The refractive index Nd2 of the second lens satisfies the following relationship: 1.6 < Nd2 < 2.0;

[0068] The refractive index Nd3 of the third lens satisfies the following relationship: 1.7 < Nd3 < 2.1;

[0069] The refractive index Nd4 of the fourth lens satisfies the following relationship: 1.7 < Nd4 < 2.1;

[0070] The refractive index Nd5 of the fifth lens satisfies the following relationship: 1.8 < Nd5 < 2.8;

[0071] The refractive index Nd6 of the sixth lens satisfies the following relationship: 1.3 < Nd6 < 1.7;

[0072] The refractive index Nd7 of the seventh lens satisfies the following relationship: 1.4 < Nd7 < 1.8;

[0073] The refractive index Nd8 of the eighth lens satisfies the following relationship: 1.6 < Nd8 < 2.1;

[0074] The refractive index Nd9 of the ninth lens satisfies the following relationship: 1.4 < Nd9 < 1.8;

[0075] The refractive index Nd of the tenth lens 10 The following relationship must be satisfied: 1.3 < Nd 10 <1.7

[0076] The beneficial effects of the above embodiments are that by reasonably allocating the refractive index of each lens, the propagation path of light can be effectively controlled, aberrations can be reduced, thereby improving the clarity and contrast of the image.

[0077] In summary, the beneficial effects of the present invention are as follows:

[0078] Firstly, this patented lens adopts an all-glass structure, which includes seven spherical glass lenses and three aspherical glass lenses, achieving a fisheye lens with a focal length of 2.9mm.

[0079] Secondly, the overall dimensions of the device are φ30*30.2mm, the maximum outer diameter of the lens is less than 24.5mm, and the total optical length is less than 30.3mm.

[0080] Thirdly, the system can be used with a 1 / 1.32-inch sensor with 50 million pixels, providing high imaging resolution.

[0081] Fourth, the lens has a maximum field of view of 198°, a relative illumination of more than 67% across the entire field of view, and a high field of view utilization rate.

[0082] Fifth, the lens has a vertical chromatic aberration value of less than 3µm, resulting in high color reproduction of the image and effective suppression of purple fringing.

[0083] The present invention will now be described in more detail with reference to the following tables. It should be noted that the following tables are merely specific embodiments of the present invention and not limiting examples.

[0084] For ease of description, in the table, surface numbers 1 and 2 represent the object-side and image-side surfaces of the first lens, respectively; surface numbers 3 and 4 represent the object-side and image-side surfaces of the second lens, respectively; surface numbers 5 and 6 represent the object-side and image-side surfaces of the third lens, respectively; surface numbers 6 and 7 represent the object-side and image-side surfaces of the fourth lens, respectively; surface numbers 8 and 9 represent the object-side and image-side surfaces of the fifth lens, respectively; and surface numbers 10 and 11 represent the object-side and image-side surfaces of the sixth lens, respectively. ; Surface number 12 is the surface of the aperture stop; Surface numbers 13 and 14 are the object-side and image-side of the seventh lens, respectively; Surface numbers 14 and 15 are the object-side and image-side of the eighth lens, respectively; Surface numbers 16 and 17 are the object-side and image-side of the ninth lens, respectively; Surface numbers 18 and 19 are the object-side and image-side of the tenth lens, respectively; Surface numbers 20 and 21 are the object-side and image-side of the protective glass, respectively; Surface number 22 is the surface of the imaging plane.

[0085] Please refer to Figure 1 for the optical structure of Embodiment 1. The specific parameters of Embodiment 1 are shown in Table 1 below. In Embodiment 1, the lens focal length f = 2.9 mm and the total length TTL = 30.24 mm.

[0086] Table 1 - Lens Parameter Table for Example 1

[0087]

[0088] According to Table 1, the conditional expression of Embodiment 1 of the present invention can be read as follows:

[0089] (1) The refractive index of the first lens is Nd1=2; the focal length of the first lens is f1=-15.4; the absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens is: f1 / f =5.31.

[0090] (2) The refractive index of the second lens is Nd2 = 1.8; the focal length of the second lens is f2 = -7.3; the focal length of the second lens is... The absolute value of the ratio to the overall focal length f of the lens: f2 / f =2.52.

[0091] (3) The refractive index of the third lens is Nd3 = 1.9; the focal length of the third lens is f3 = -9; the absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens is: f3 / f =3.10.

[0092] (4) The refractive index of the fourth lens is Nd4 = 1.9; the focal length of the fourth lens is f4 = 12; the absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens is: f4 / f =4.14.

[0093] (5) The refractive index of the fifth lens is Nd5 = 2; the focal length of the fifth lens is f5 = 7.3; the absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens is: f5 / f =2.52.

[0094] (6) The refractive index of the sixth lens is Nd6 = 1.5; the focal length of the sixth lens is f6 = -32.9; the absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens is: f6 / f =11.34.

[0095] (7) The refractive index of the seventh lens is Nd7 = 1.6; the focal length of the seventh lens is f7 = 4.40; the absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens is: f7 / f =1.52.

[0096] (8) The refractive index of the eighth lens is Nd8 = 1.85; the focal length of the eighth lens is f8 = -3.00; the absolute value of the ratio of the focal length f8 of the eighth lens to the overall focal length f of the lens is: f8 / f =1.03.

[0097] (9) The refractive index of the ninth lens is Nd9 = 1.5; the focal length of the ninth lens is f9 = 10.3; the absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens is: f9 / f =3.55.

[0098] (10) The refractive index Nd of the tenth lens 10 =1.5; Focal length f of the tenth lens 10 =15; the focal length f of the tenth lens 10 The absolute value of the ratio to the overall focal length f of the lens: f 10 / f =5.17.

[0099] Table 2 - Arrangement of Aspherical Coefficients of Various Aspherical Lenses in Example 1

[0100]

[0101] Please refer to Figure 6 for the optical structure of Embodiment 2. The specific parameters of Embodiment 2 are shown in Table 3 below. In Embodiment 2, the lens focal length f = 2.9 mm and the total length TTL = 29.91 mm.

[0102] Table 3 - Lens Parameter Table for Example 2

[0103]

[0104] According to Table 1, the conditional expression of Embodiment 1 of the present invention can be read as follows:

[0105] (1) The refractive index of the first lens is Nd1=2; the focal length of the first lens is f1=-11; the absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens is: f1 / f =3.79.

[0106] (2) The refractive index of the second lens is Nd2 = 1.8; the focal length of the second lens is f2 = -9.5; the focal length of the second lens is... The absolute value of the ratio to the overall focal length f of the lens: f2 / f =3.28.

[0107] (3) The refractive index of the third lens is Nd3 = 1.9; the focal length of the third lens is f3 = -6; the absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens is: f3 / f =2.07.

[0108] (4) The refractive index of the fourth lens is Nd4 = 1.9; the focal length of the fourth lens is f4 = 8; the absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens is: f4 / f =2.76.

[0109] (5) The refractive index of the fifth lens is Nd5 = 2; the focal length of the fifth lens is f5 = 7.6; the absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens is: f5 / f =2.62.

[0110] (6) The refractive index of the sixth lens is Nd6 = 1.5; the focal length of the sixth lens is f6 = -42.4; the absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens is: f6 / f =14.62.

[0111] (7) The refractive index of the seventh lens is Nd7 = 1.6; the focal length of the seventh lens is f7 = 4.10; the absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens is: f7 / f =1.41.

[0112] (8) The refractive index of the eighth lens is Nd8 = 1.85; the focal length of the eighth lens is f8 = -2.80; the absolute value of the ratio of the focal length f8 of the eighth lens to the overall focal length f of the lens is: f8 / f =0.97.

[0113] (9) The refractive index of the ninth lens is Nd9 = 1.6; the focal length of the ninth lens is f9 = 10.8; the absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens is: f9 / f =3.72.

[0114] (10) The refractive index Nd of the tenth lens 10 =1.5; Focal length f of the tenth lens 10 =13.2; the focal length f of the tenth lens 10 The absolute value of the ratio to the overall focal length f of the lens: f 10 / f =4.55.

[0115] Table 4 - Arrangement of Aspherical Coefficients of Various Aspherical Lenses in Example 1

[0116]

[0117] Table 5 - Lens Parameters

[0118]

[0119] The following is an explanation of the various figures in Examples 1 and 2:

[0120] Figure 2 shows the MTF (Mean Transformer Graph) of Example 1 in the visible light band. As can be seen from the figure, the contrast ratio across the entire field of view is greater than 0.4 at 200 lp / mm, approaching the diffraction limit, indicating uniform imaging quality and high resolution.

[0121] Figure 3 shows the optical distortion and field curvature diagrams for Example 1. As can be seen from the figure, the F-Theta distortion is less than 4%, the field curvature is well controlled, and the image fidelity is high.

[0122] Figure 4 shows the vertical color difference diagram of Example 1. As can be seen from the figure, the maximum color difference value is less than 2.8 μm, the color reproduction is good, and purple fringing can be effectively suppressed.

[0123] Figure 5 shows the relative illuminance diagram of Example 1. As can be seen from the figure, the relative illuminance across the entire field of view is greater than 67%, indicating high energy utilization.

[0124] Figure 7 shows the MTF (Mean Transformer Graph) of Example 2 in the visible light band. As can be seen from the figure, the contrast ratio across the entire field of view is greater than 0.4 at 200 lp / mm, approaching the diffraction limit, indicating uniform imaging quality and high resolution.

[0125] Figure 8 shows the optical distortion and field curvature diagrams for Example 2. As can be seen from the figure, the F-Theta distortion is less than 4%, the field curvature is well controlled, and the image fidelity is high.

[0126] Figure 9 shows the vertical color difference diagram of Example 2. As can be seen from the figure, the maximum color difference value is less than 2.8 μm, indicating good color reproduction and effective suppression of purple fringing.

[0127] Figure 10 shows the relative illuminance diagram of Example 2. As can be seen from the figure, the relative illuminance across the entire field of view is greater than 67%, indicating high energy utilization.

[0128] On the other hand, referring now to FIG11, a structural schematic diagram of the electronic device A according to the present invention will be given. FIG11 is a schematic diagram of an electronic device (camera) for a photographic optical system of any one of the ultra-high-definition large-format fisheye lenses according to Embodiments 1 to 2.

[0129] In Figure 11, reference numeral A2 indicates the main body of the electronic device, and reference numeral A1 indicates any of the camera optical systems (interchangeable lenses) including the ultra-high-definition large-format fisheye lenses according to Examples 1 to 2. Reference numeral A3 indicates an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built into the camera body A2 and receives light (the optical image formed by the camera optical system A1) from the camera optical system A1 and performs photoelectric conversion.

[0130] By using the ultra-high-definition large-format fisheye lens according to any one of Embodiments 1 to 2 in electronic devices such as digital still cameras, electronic devices with high optical performance can be obtained.

[0131] Each example can provide electronic devices with high optical performance.

[0132] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims will be given the broadest interpretation to cover all such modifications and equivalent structures and functions.

Claims

1. An ultra-high-definition large-surface fisheye lens, characterized in that, It consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object side to the image side. The first lens has negative refractive power, its object-side surface is convex, and its image-side surface is concave. The second lens has negative refractive power, its object-side surface is convex, and its image-side surface is concave. The third lens has negative refractive power, its object-side surface is concave, and its image-side surface is either convex or concave. The fourth lens has positive refractive power, its object-side surface is either concave or convex, and its image-side surface is convex. The fifth lens has positive refractive power, and its object-side surface is convex. The fifth lens has a flat image-side surface; the sixth lens has negative refractive power, its object-side surface is concave, and its image-side surface is convex; the seventh lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; the eighth lens has negative refractive power, its object-side surface is concave, and its image-side surface is concave; the ninth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; the tenth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; the lenses satisfy the following relationship: the absolute value of the ratio of the focal length f1 of the first lens to the overall focal length f of the lens satisfies the following relationship: 3 ≤ f1 / f ≤6; Focal length of the second lens The absolute value of the ratio to the overall focal length f of the lens satisfies the following relationship: 2 ≤ f2 / f ≤4; The absolute value of the ratio of the focal length f3 of the third lens to the overall focal length f of the lens satisfies the following relationship: 1.5≤ f3 / f ≤3.5; The absolute value of the ratio of the focal length f4 of the fourth lens to the overall focal length f of the lens satisfies the following relationship: 2.76≤ f4 / f ≤5; The absolute value of the ratio of the focal length f5 of the fifth lens to the overall focal length f of the lens satisfies the following relationship: 2≤ f5 / f ≤3; The absolute value of the ratio of the focal length f6 of the sixth lens to the overall focal length f of the lens satisfies the following relationship: 10≤ f6 / f ≤16; The absolute value of the ratio of the focal length f7 of the seventh lens to the overall focal length f of the lens satisfies the following relationship: 1≤ f7 / f ≤2; The absolute value of the ratio of the focal length f8 of the eighth lens to the overall focal length f of the lens satisfies the following relationship: 0.5≤ f8 / f ≤1.5; The absolute value of the ratio of the focal length f9 of the ninth lens to the overall focal length f of the lens satisfies the following relationship: 3≤ f9 / f ≤4; the focal length f of the tenth lens 10 The absolute value of the ratio to the overall focal length f of the lens satisfies the following relationship: 4 ≤ f 10 / f The refractive index Nd2 of the second lens satisfies the following relationship: 1.6 < Nd2 < 2.0; the refractive index Nd3 of the third lens satisfies the following relationship: 1.7 < Nd3 < 2.1; the refractive index Nd4 of the fourth lens satisfies the following relationship: 1.7 < Nd4 < 2.1; the refractive index Nd5 of the fifth lens satisfies the following relationship: 1.8 < Nd5 < 2.8; the refractive index Nd6 of the sixth lens satisfies the following relationship: 1.3 < Nd6 < 1.7; the refractive index Nd7 of the seventh lens satisfies the following relationship: 1.4 < Nd7 < 1.8; the refractive index Nd8 of the eighth lens satisfies the following relationship: 1.6 < Nd8 < 2.1; the refractive index Nd9 of the ninth lens satisfies the following relationship: 1.4 < Nd9 < 1.8; the refractive index Nd... 10 The following relationship must be satisfied: 1.3 < Nd 10 <1.

7.

2. The ultra-high-definition large-surface fisheye lens as described in claim 1, characterized in that, The lens satisfies the following relationship: Nd1≥2; 11<|f1|<16; where Nd1 is the refractive index of the first lens and f1 is the focal length of the first lens.

3. The ultra-high-definition large-surface fisheye lens as described in claim 1, characterized in that, The lens satisfies the following relationship: |Vd8-Vd7|>28; Wherein, Vd7 is the Abbe number of the seventh lens, Vd8 is the Abbe coefficient of the eighth lens, and the seventh and eighth lenses are a cemented lens group.

4. The ultra-high-definition large-surface fisheye lens as described in claim 1, characterized in that, The lens satisfies the following relationship: 0.10 < BFL / TTL < 0.12; where BFL is the optical back focal length of the lens and TTL is the total optical length of the lens.

5. The ultra-high-definition large-surface fisheye lens as described in claim 1, characterized in that, The lens satisfies the following relationship: 1.0 < BFL / f < 1.3; where BFL is the optical back focal length of the lens and f is the total optical focal length of the lens.

6. The ultra-high-definition large-surface fisheye lens as described in claim 1, characterized in that, The lens satisfies the following relationship: the sixth lens, the ninth lens, and the tenth lens are aspherical glass lenses.

7. The ultra-high-definition large-surface fisheye lens as described in claim 1, characterized in that, The lens satisfies the following relationship: the second lens, the sixth lens, and the tenth lens are glass aspherical lenses.

8. An electronic device, characterized in that, An ultra-high-definition large-format fisheye lens according to any one of claims 1-7; and an image sensor configured to receive an image formed by the ultra-high-definition large-format fisheye lens.

Images