A positive distortion fisheye lens

Abstract

The present invention discloses a positive distortion fisheye lens, which includes the first lens to the tenth lens in sequence from the object side to the image side along an optical axis, and the first lens to the tenth lens each include an object side surface and an image side surface; the first lens has a negative refractive power; the second lens has a negative refractive power; the third lens has a negative refractive power; the fourth lens has a negative refractive power; the fifth lens has a positive refractive power; the sixth lens has a positive refractive power; the seventh lens has a positive refractive power; the eighth lens has a negative refractive power; the ninth lens has a positive refractive power; the tenth lens has a negative refractive power; the optical imaging lens has only the above ten lenses with refractive power. The present invention can support 12MP pixels, has a high-definition imaging effect, and the imaging picture is clear and uniform; it can ensure that the lens has a good picture brightness when used in a night environment; it can be confocal day and night, realize day and night dual use, and can also ensure clear imaging in night mode; the pixel ratio of the edge of the lens is large, and the compression sense is small.

Description

Technical Field

[0001] The invention relates to the technical field of lenses, and in particular to a positive distortion fisheye lens. Background Art

[0002] The front lens of the fisheye lens has a large diameter and protrudes toward the front of the lens in a parabolic shape, which is quite similar to the eye of a fish, so it is commonly known as "fisheye lens". Currently, fisheye lenses have been widely used in VR cameras, security monitoring, video conferencing, drones, and vehicle-mounted fields. Therefore, the requirements for fisheye lenses are getting higher and higher.

[0003] However, existing fisheye lenses have at least the following deficiencies:

[0004] 1. General fisheye lenses generally have low pixel count and insufficient resolution, resulting in blurry images and high noise.

[0005] 2. Due to the wide-angle design requirements, general fisheye lenses generally have limited light transmission and the relative illumination at the edge of the picture is relatively low.

[0006] 3. General fisheye lenses can only support single visible use or single infrared use, and cannot achieve clear state during the day and night at the same time.

[0007] 4. General fisheye lenses have negative f-theta distortion, large distortion, a small proportion of pixels at the edge, and a strong sense of compression. Summary of the invention

[0008] An object of the present invention is to provide a positive distortion fisheye lens to solve at least one of the above problems.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A positive distortion fisheye lens, comprising a first lens to a tenth lens in sequence from an object side to an image side along an optical axis, wherein the first lens to the tenth lens each comprises an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough;

[0011] The first lens has a negative refractive power, and the object side surface of the first lens is a convex surface, and the image side surface is a concave surface;

[0012] The second lens has a negative refractive power, and the object side surface of the second lens is a convex surface and the image side surface is a concave surface;

[0013] The third lens has a negative refractive power, and the object side surface and the image side surface of the third lens are concave;

[0014] The fourth lens has a negative refractive power, and the object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface;

[0015] The fifth lens has a positive refractive power, and the object side surface and the image side surface of the fifth lens are convex;

[0016] The sixth lens has a positive refractive power, and the object side surface of the sixth lens is a concave surface, and the image side surface is a convex surface;

[0017] The seventh lens has a positive refractive power, and the object side surface of the seventh lens is a flat surface, and the image side surface is a convex surface;

[0018] The eighth lens has a negative refractive power, and the object side surface of the eighth lens is a concave surface, and the image side surface is a convex surface;

[0019] The ninth lens has a positive refractive power, and the object side surface and the image side surface of the ninth lens are convex;

[0020] The tenth lens has a negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface is a convex surface;

[0021] The optical imaging lens has only the above ten lenses with refractive powers.

[0022] Preferably, the image side surface of the fifth lens and the object side surface of the sixth lens are glued to each other and meet the following condition: |vd5-vd6|>25, wherein vd5 is the Abbe coefficient of the fifth lens, and vd6 is the Abbe coefficient of the sixth lens.

[0023] Preferably, the image side surface of the seventh lens and the object side surface of the eighth lens are glued to each other and meet the following condition: |vd7-vd8|>40, wherein vd7 is the Abbe coefficient of the seventh lens, and vd8 is the Abbe coefficient of the eighth lens.

[0024] Preferably, the image side surface of the ninth lens and the object side surface of the tenth lens are glued to each other and meet the following condition: |vd9-vd10|>30, wherein vd9 is the Abbe coefficient of the ninth lens, and vd10 is the Abbe coefficient of the tenth lens.

[0025] Preferably, the seventh lens and the ninth lens are both made of materials with a negative refractive index temperature coefficient dn / dt, and meet the following conditional formula: vd7>65, vd9>60.

[0026] Preferably, the first lens, the second lens, the third lens and the fourth lens are all in the shape of a straw hat.

[0027] Preferably, the second lens and the fourth lens are both glass aspherical lenses, the remaining lenses are glass spherical lenses, and a stop is provided between the sixth lens and the seventh lens.

[0028] Preferably, the lens meets the following conditions:

[0029] 15<|(f1 / f)|<18, 6<|(f2 / f)|<7, 4<|(f3 / f)|<5,

[0030] 11<|(f4 / f)|<12, 4<|(f5 / f)|<5, 15<|(f6 / f)|<19,

[0031] 3.5<|(f7 / f)|<4.5, 6.5<|(f8 / f)|<7.5,

[0032] 3<|(f9 / f)|<3.5, 5.5<|(f10 / f)|<6.5,

[0033] Among them, f is the focal length of the lens, f1, f2, f3, f4, f5, f6, f7, f8, f9, and f10 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens respectively.

[0034] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0035] 1. The present invention uses ten lenses from the object side to the image side, and through the arrangement design of the refractive power and surface shape of each lens, the lens is matched with a 1 / 2.3" sensor, which can support 12MP pixels, has a high-definition imaging effect, and the imaging picture is clear and uniform.

[0036] 2. The light transmission of the present invention is F / 2.2, and the illumination at the edge of the image is greater than 60%, ensuring that the lens can have good image brightness when used in a night environment.

[0037] 3. The infrared confocality of the present invention is good, and the lens can be confocal day and night, realizing day and night dual use, and clear imaging can be guaranteed in night mode.

[0038] 4. The present invention has a large field of view and adopts a positive distortion design, with f-theta distortion less than +23%, so that the pixel ratio at the edge is large and the sense of compression is small.

[0039] 5. In the present invention, both the second lens and the fourth lens are glass aspherical lenses, which can not only correct distortion but also improve resolution. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a light path diagram of Embodiment 1;

[0041] Figure 2 This is the MTF curve of the lens in Example 1 under visible light 435nm-656nm;

[0042] Figure 3 This is a defocus curve diagram of the lens in Example 1 under visible light 435nm-656nm;

[0043] Figure 4 This is a defocus curve diagram of the lens in Example 1 at 850nm infrared;

[0044] Figure 5 The field curvature and distortion diagram of the lens in Example 1 at 850nm infrared;

[0045] Figure 6 This is a relative illumination diagram of the lens in Example 1 under infrared 850nm;

[0046] Figure 7 This is the optical path diagram of Embodiment 2;

[0047] Figure 8 This is the MTF curve of the lens in Example 2 under visible light 435nm-656nm;

[0048] Fig. 9 This is a defocus curve diagram of the lens in Example 2 under visible light 435nm-656nm;

[0049] Fig.10 This is a defocus curve diagram of the lens in Example 2 at 850nm infrared;

[0050] Fig.11 The field curvature and distortion diagram of the lens in Example 1 at 850nm infrared;

[0051] Fig.12 This is a relative illumination diagram of the lens in Example 1 under visible light of 546 nm;

[0052] Fig.13 This is the optical path diagram of Embodiment 3;

[0053] Fig.14 This is the MTF curve of the lens in Example 3 under visible light 435nm-656nm;

[0054] Fig.15 This is a defocus curve diagram of the lens in Example 3 under visible light 435nm-656nm;

[0055] Fig.16 This is a defocus curve diagram of the lens in Example 3 at 850nm infrared;

[0056] Fig.17 The field curvature and distortion diagram of the lens in Example 3 under visible light 435nm-656nm;

[0057] Fig.18 This is a relative illumination diagram of the lens in Example 3 under visible light of 546 nm;

[0058] Fig.19 This is the optical path diagram of Embodiment 4;

[0059] Fig. 20 This is the MTF curve of the lens in Example 4 under visible light 435nm-656nm;

[0060] Fig.21 This is a defocus curve diagram of the lens in Example 4 under visible light 435nm-656nm;

[0061] Fig. 22 This is a defocus curve diagram of the lens in Example 4 at 850nm infrared;

[0062] Fig.23 The field curvature and distortion diagram of the lens in Example 4 under visible light 435nm-656nm;

[0063] Fig.24 This is a relative illumination diagram of the lens in Example 4 under visible light of 546 nm.

[0064] Description of reference numerals:

[0065] A first lens 1 , a second lens 2 , a third lens 3 , a fourth lens 4 , a fifth lens 5 , a sixth lens 6 , a seventh lens 7 , an eighth lens 8 , a ninth lens 9 , a tenth lens 10 , and a stop 11 . DETAILED DESCRIPTION

[0066] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0067] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0068] In this specification, "a lens having a positive refractive power (or a negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "object side (or image side) of the lens" is defined as a specific range of the lens surface through which the imaging light passes. The concave and convex shape of the lens can be judged according to the judgment method of ordinary knowledge in this field, that is, the concave and convex shape of the lens surface can be judged by the positive and negative signs of the radius of curvature (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet (lensdatasheet) of optical design software. For the object side, when the R value is positive, the object side is judged to be convex; when the R value is negative, the object side is judged to be concave. Conversely, for the image side, when the R value is positive, the image side is judged to be concave; when the R value is negative, the image side is judged to be convex.

[0069] The present invention discloses a positive distortion fisheye lens, which includes a first lens 1 to a tenth lens 10 in sequence from an object side A1 to an image side A2 along an optical axis, wherein the first lens 1 to the tenth lens 10 each include an object side surface facing the object side A1 and allowing imaging light to pass through, and an image side surface facing the image side A2 and allowing imaging light to pass through;

[0070] The first lens 1 has a negative refractive power, and the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;

[0071] The second lens 2 has a negative refractive power, and the object side surface of the second lens 2 is a convex surface, and the image side surface is a concave surface;

[0072] The third lens 3 has a negative refractive power, and the object side surface and the image side surface of the third lens 3 are concave;

[0073] The fourth lens element 4 has a negative refractive power, and the object side surface of the fourth lens element 4 is a convex surface, and the image side surface is a concave surface;

[0074] The fifth lens element 5 has a positive refractive power, and the object side surface and the image side surface of the fifth lens element 5 are convex;

[0075] The sixth lens element 6 has a positive refractive power, and the object side surface of the sixth lens element 6 is a concave surface, and the image side surface is a convex surface;

[0076] The seventh lens element 7 has a positive refractive power, and the object side surface of the seventh lens element 7 is a flat surface, and the image side surface is a convex surface;

[0077] The eighth lens element 8 has a negative refractive power, and the object side surface of the eighth lens element 8 is a concave surface, and the image side surface is a convex surface;

[0078] The ninth lens element 9 has a positive refractive power, and the object side surface and the image side surface of the ninth lens element 9 are convex;

[0079] The tenth lens 10 has a negative refractive power, and the object side surface of the tenth lens 10 is a concave surface, and the image side surface is a convex surface;

[0080] The optical imaging lens has only the above ten lenses with refractive powers.

[0081] Preferably, the image side surface of the fifth lens 5 and the object side surface of the sixth lens 6 are glued to each other and meet the following condition: |vd5-vd6|>25, wherein vd5 is the Abbe coefficient of the fifth lens 5, and vd6 is the Abbe coefficient of the sixth lens 6. By combining high and low dispersion lenses, chromatic aberration can be corrected, day and night confocality can be optimized, and the image quality of the lens can be improved.

[0082] Preferably, the image side surface of the seventh lens 7 and the object side surface of the eighth lens 8 are glued to each other and meet the following condition: |vd7-vd8|>40, wherein vd7 is the Abbe coefficient of the seventh lens 7, and vd8 is the Abbe coefficient of the eighth lens 8. Through the combination of high and low dispersion lenses, chromatic aberration can be corrected, day and night confocality can be optimized, and the image quality of the lens can be improved.

[0083] Preferably, the image side surface of the ninth lens 9 and the object side surface of the tenth lens 10 are glued to each other and meet the following condition: |vd9-vd10|>30, wherein vd9 is the Abbe coefficient of the ninth lens 9, and vd10 is the Abbe coefficient of the tenth lens 10. By combining high and low dispersion lenses, chromatic aberration can be corrected, day and night confocality can be optimized, and the image quality of the lens can be improved.

[0084] Preferably, the seventh lens 7 and the ninth lens 9 are both made of a material with a negative refractive index temperature coefficient dn / dt, that is, the refractive index of the material decreases with increasing temperature, and meets the following conditional formula: vd7>65, vd9>60. The seventh lens 7 and the ninth lens 9 can offset the effect of temperature change on the back focus shift of the lens, effectively balance the temperature drift, and achieve athermalization, so that the lens can still produce clear images when used in a temperature range of -40°C to 85°C.

[0085] Preferably, the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 are all in the shape of a straw hat. At the same time, the refractive powers of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 are all negative values, which can quickly collect the light entering from the object side, achieve a large field of view, and control the distortion of the lens.

[0086] Preferably, the second lens 2 and the fourth lens 4 are both glass aspherical lenses, which can correct distortion and improve resolution. The remaining lenses are glass spherical lenses, and a stop 11 is provided between the sixth lens 6 and the seventh lens 7.

[0087] The equations for the object-side and image-side curves of a glass aspheric lens are expressed as follows:

[0088]

[0089] in:

[0090] z: Depth of the aspherical surface (the vertical distance between the point on the aspherical surface that is y away from the optical axis and the tangent plane that is tangent to the vertex on the optical axis of the aspherical surface);

[0091] c: the vertex curvature of the aspherical surface;

[0092] K: Conic Constant;

[0093] radial distance;

[0094] r n : Normalization radius (NRADIUS);

[0095] u:r / r n ;

[0096] a m : mth order Q con coefficient (is the mth Q con coefficient);

[0097] Q m con : mth order Q con Polynomial (the mth Q con polynomial).

[0098] Preferably, the lens meets the following conditions:

[0099] 15<|(f1 / f)|<18, 6<|(f2 / f)|<7, 4<|(f3 / f)|<5,

[0100] 11<|(f4 / f)|<12, 4<|(f5 / f)|<5, 15<|(f6 / f)|<19,

[0101] 3.5<|(f7 / f)|<4.5, 6.5<|(f8 / f)|<7.5,

[0102] 3<|(f9 / f)|<3.5, 5.5<|(f10 / f)|<6.5,

[0103] The optical performance of the lens can be improved by reasonably allocating the optical focal length, where f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, f9, and f10 are the focal lengths of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, and the tenth lens 10, respectively.

[0104] The orthodistortion fisheye lens of the present invention will be described in detail below with reference to specific embodiments.

[0105] Embodiment 1

[0106] refer to Figure 1 As shown, this embodiment discloses a positive distortion fisheye lens, which includes a first lens 1 to a tenth lens 10 in sequence from the object side A1 to the image side A2 along an optical axis, wherein the first lens 1 to the tenth lens 10 each include an object-side surface facing the object side A1 and allowing imaging light to pass through, and an image-side surface facing the image side A2 and allowing imaging light to pass through;

[0107] The first lens 1 has a negative refractive power, and the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;

[0108] The second lens 2 has a negative refractive power, and the object side surface of the second lens 2 is a convex surface, and the image side surface is a concave surface;

[0109] The third lens 3 has a negative refractive power, and the object side surface and the image side surface of the third lens 3 are concave;

[0110] The fourth lens element 4 has a negative refractive power, and the object side surface of the fourth lens element 4 is a convex surface, and the image side surface is a concave surface;

[0111] The fifth lens element 5 has a positive refractive power, and the object side surface and the image side surface of the fifth lens element 5 are convex;

[0112] The sixth lens element 6 has a positive refractive power, and the object side surface of the sixth lens element 6 is a concave surface, and the image side surface is a convex surface;

[0113] The seventh lens element 7 has a positive refractive power, and the object side surface of the seventh lens element 7 is a flat surface, and the image side surface is a convex surface;

[0114] The eighth lens element 8 has a negative refractive power, and the object side surface of the eighth lens element 8 is a concave surface, and the image side surface is a convex surface;

[0115] The ninth lens element 9 has a positive refractive power, and the object side surface and the image side surface of the ninth lens element 9 are convex;

[0116] The tenth lens 10 has a negative refractive power, and the object side surface of the tenth lens 10 is a concave surface, and the image side surface is a convex surface;

[0117] The optical imaging lens has only the above ten lenses with refractive power; the image side surface of the fifth lens 5 and the object side surface of the sixth lens 6 are glued to each other; the image side surface of the seventh lens 7 and the object side surface of the eighth lens 8 are glued to each other; the image side surface of the ninth lens 9 and the object side surface of the tenth lens 10 are glued to each other; the second lens 2 and the fourth lens 4 are both glass aspherical lenses, and the remaining lenses are glass spherical lenses, and an aperture 11 is provided between the sixth lens 6 and the seventh lens 7.

[0118] The detailed optical data of this specific embodiment are shown in Table 1.

[0119] Table 1 Detailed optical data of Example 1

[0120]

[0121]

[0122] In this specific embodiment, please refer to the following table for detailed parameter data of the aspheric surfaces of the second lens 2 and the fourth lens 4:

[0123] Surface number K A4 A6 A8 A10 A12 A14 A16 4 0.81 2.178E-04 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14 5 -0.52 -3.757E-04 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0.000E+00 8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08 9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08

[0124] In this specific embodiment, the optical system has a focal length of f=1.23 mm, a light transmission FNO=2.2, a field of view FOV=182°, and a lens matching a 1 / 2.3″ sensor, which can support 12MP pixels.

[0125] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 1 Please refer to the MTF curve of the lens under visible light 435nm-656nm Figure 2 As can be seen from the figure, when the spatial frequency of this lens reaches 225lp / mm, the full field transfer function image is still greater than 30%, the center to edge uniformity is high, the imaging quality is excellent, and the lens resolution is high. For the defocus curve of visible light 435nm-656nm, please refer to Figure 3 , please refer to the infrared 850nm defocus curve Figure 4 As can be seen from the figure, the lens has a small defocus under visible light and infrared light, and can be used both day and night. For the field curvature and distortion diagram of the lens under infrared 850nm, please refer to Figure 5 As can be seen from the figure, the optical distortion is controlled within +20%, so that the pixel ratio at the edge is large, the compression is small, the imaging frame will not be obviously deformed, and the image restoration is relatively accurate. Please refer to the relative illumination diagram of the lens at infrared 850nm Figure 6 As can be seen from the figure, the illumination at the edge of the image is greater than 60%, ensuring good picture brightness when used in night environments.

[0126] Embodiment 2

[0127] Cooperate Figures 7 to 12 As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and lens thickness are different.

[0128] The detailed optical data of this specific embodiment are shown in Table 2.

[0129] Table 2 Detailed optical data of Example 2

[0130] surface type Size (diameter) Radius of curvature thickness Material Refractive Index Dispersion coefficient focal length OBJ Subject surface 0.000 Infinity Infinity 1 First lens 24.671 21.329 1.294 TAF3D 1.80420 46.503 -19.886 2 15.920 8.918 3.296 3 Second lens 14.618 13.959 0.700 M-NBFD130 1.80610 40.731 -8.053 4 10.508 4.349 4.054 5 The third lens 10.000 -27.510 0.794 H-FK61 1.49700 81.595 -5.727 6 5.445 3.216 2.339 7 The fourth lens 6.074 19.403 0.700 M-LAC130 1.69350 53.201 -13.987 8 5.632 6.390 0.187 9 Fifth lens 5.700 5.486 2.248 H-ZF7LA 1.80519 25.477 5.238 10 The sixth lens 5.700 -15.506 2.947 H-LAK52 1.72916 54.669 20.470 11 6.000 -8.234 1.047 STO 2.348 Infinity 0.025 13 Seventh lens 2.400 Infinity 1.980 H-ZPK5 1.59281 68.525 4.897 14 The eighth lens 4.000 -2.913 1.065 E-FDS1 1.92286 20.880 -8.623 15 6.000 -5.372 0.098 16 The ninth lens 3.100 13.875 1.768 H-ZPK2A 1.60300 65.460 3.758 17 Tenth lens 4.000 -2.589 0.859 H-ZF7LA 1.80519 25.477 -7.119 18 6.000 -5.385 3.063 19 Protective glass 4.492 Infinity 0.800 H-K9L 1.51680 64.198 20 4.586 Infinity 0.537 IMA Imaging surface 4.683 Infinity

[0131] In this specific embodiment, please refer to the following table for detailed parameter data of the aspheric surfaces of the second lens 2 and the fourth lens 4:

[0132] Surface number K A4 A6 A8 A10 A12 A14 A16 4 0.81 2.178E-04 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14 5 -0.52 -3.757E-04 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0.000E+00 8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08 9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08

[0133] In this specific embodiment, the optical system has a focal length of f=1.23 mm, a light transmission FNO=2.2, a field of view FOV=182°, and a lens matching a 1 / 2.3″ sensor, which can support 12MP pixels.

[0134] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 7 Please refer to the MTF curve of the lens under visible light 435nm-656nm Figure 8 As can be seen from the figure, when the spatial frequency of this lens reaches 225lp / mm, the full field transfer function image is still greater than 30%, the center to edge uniformity is high, the imaging quality is excellent, and the lens resolution is high. For the defocus curve of visible light 435nm-656nm, please refer to Fig. 9 , please refer to the infrared 850nm defocus curve Fig.10 As can be seen from the figure, the lens has a small defocus under visible light and infrared light, and can be used both day and night. For the field curvature and distortion diagram of the lens under infrared 850nm, please refer to Fig.11 As can be seen from the figure, the optical distortion is controlled within +23%, which makes the edge pixels account for a large proportion, the compression is small, the imaging frame will not be obviously deformed, and the image restoration is relatively accurate. Please refer to the relative illumination diagram of the lens under visible light 546nm Fig.12 As can be seen from the figure, the illumination at the edge of the image is greater than 65%, ensuring good picture brightness when used in night environments.

[0135] Embodiment 3

[0136] Cooperate Figures 13 to 18As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and lens thickness are different.

[0137] The detailed optical data of this specific embodiment are shown in Table 3.

[0138] Table 3 Detailed optical data of Example 3

[0139] surface type Size (diameter) Radius of curvature thickness Material Refractive Index Dispersion coefficient focal length OBJ Subject surface 0.000 Infinity Infinity 1 First lens 24.294 19.847 1.294 TAF3D 1.80420 46.503 -18.683 2 15.295 8.326 3.348 3 Second lens 14.618 13.959 0.700 M-NBFD130 1.80610 40.731 -8.053 4 10.508 4.349 3.999 5 The third lens 10.000 -28.595 0.943 H-FK61 1.49700 81.595 -5.562 6 5.281 3.104 2.037 7 The fourth lens 6.074 19.403 0.700 M-LAC130 1.69350 53.201 -13.987 8 5.632 6.390 0.147 9 Fifth lens 5.700 5.393 4.280 H-ZF7LA 1.80519 25.477 5.399 10 The sixth lens 5.700 -15.155 1.256 H-LAK52 1.72916 54.669 21.020 11 6.000 -7.904 0.934 STO 2.347 Infinity 0.050 13 Seventh lens 2.400 Infinity 1.935 H-ZPK5 1.59281 68.525 4.840 14 The eighth lens 4.000 -2.879 0.995 E-FDS1 1.92286 20.880 -8.512 15 6.000 -5.269 0.098 16 The ninth lens 3.100 15.497 1.807 H-ZPK2A 1.60300 65.460 3.725 17 Tenth lens 4.000 -2.522 0.904 H-ZF7LA 1.80519 25.477 -7.162 18 6.000 -5.165 1.779 19 Protective glass 4.297 Infinity 0.800 H-K9L 1.51680 64.198 20 4.380 Infinity 1.821 IMA Imaging surface 4.687 Infinity

[0140] In this specific embodiment, please refer to the following table for detailed parameter data of the aspheric surfaces of the second lens 2 and the fourth lens 4:

[0141] Surface number K A4 A6 A8 A10 A12 A14 A16 4 0.81 2.178E-04 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14 5 -0.52 -3.757E-04 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0.000E+00 8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08 9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08

[0142] In this specific embodiment, the optical system has a focal length of f=1.20 mm, a light transmission FNO=2.2, a field of view FOV=182°, and a lens matching a 1 / 2.3″ sensor, which can support 12MP pixels.

[0143] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Fig.13 Please refer to the MTF curve of the lens under visible light 435nm-656nm Fig.14 As can be seen from the figure, when the spatial frequency of this lens reaches 225lp / mm, the full field transfer function image is still greater than 30%, the center to edge uniformity is high, the imaging quality is excellent, and the lens resolution is high. For the defocus curve of visible light 435nm-656nm, please refer to Fig.15 , please refer to the infrared 850nm defocus curve Fig.16 As can be seen from the figure, the lens has a small defocus under visible light and infrared light, and can be focused day and night, achieving dual-purpose use. For the field curvature and distortion diagram of the lens under visible light 435nm-656nm, please refer to Fig.17 As can be seen from the figure, the optical distortion is controlled within +23%, which makes the edge pixels account for a large proportion, the compression is small, the imaging frame will not be obviously deformed, and the image restoration is relatively accurate. Please refer to the relative illumination diagram of the lens under visible light 546nm Fig.18 As can be seen from the figure, the illumination at the edge of the image is greater than 65%, ensuring good picture brightness when used in night environments.

[0144] Embodiment 4

[0145] Cooperate Figures 19 to 24 As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and lens thickness are different.

[0146] The detailed optical data of this specific embodiment are shown in Table 4.

[0147] Table 4 Detailed optical data of Example 4

[0148]

[0149]

[0150] In this specific embodiment, please refer to the following table for detailed parameter data of the aspheric surfaces of the second lens 2 and the fourth lens 4:

[0151] Surface number K A4 A6 A8 A10 A12 A14 A16 4 0.81 0.0002178 -1.107E-06 -5.892E-08 1.753E-10 1.443E-11 -9.367E-14 5 -0.52 -0.000376 1.312E-05 -7.026E-07 -4.861E-09 -5.674E-10 0 8 13.34 -9.061E-04 8.945E-05 -6.488E-06 -8.313E-07 -2.306E-07 2.411E-08 9 0.45 1.020E-03 5.680E-05 2.337E-06 -3.256E-06 -1.254E-07 3.934E-08

[0152] In this specific embodiment, the optical system has a focal length of f=1.20 mm, a light transmission FNO=2.2, a field of view FOV=182°, and a lens matching a 1 / 2.3″ sensor, which can support 12MP pixels.

[0153] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Fig.19 Please refer to the MTF curve of the lens under visible light 435nm-656nm Fig. 20 As can be seen from the figure, when the spatial frequency of this lens reaches 225lp / mm, the full field transfer function image is still greater than 30%, the center to edge uniformity is high, the imaging quality is excellent, and the lens resolution is high. For the defocus curve of visible light 435nm-656nm, please refer to Fig.21 , please refer to the infrared 850nm defocus curve Fig. 22 As can be seen from the figure, the lens has a small defocus under visible light and infrared light, and can be focused day and night, achieving dual-purpose use. For the field curvature and distortion diagram of the lens under visible light 435nm-656nm, please refer to Fig.23 As can be seen from the figure, the optical distortion is controlled within +23%, which makes the edge pixels account for a large proportion, the compression is small, the imaging frame will not be obviously deformed, and the image restoration is relatively accurate. Please refer to the relative illumination diagram of the lens under visible light 546nm Fig.24 As can be seen from the figure, the illumination at the edge of the image is greater than 65%, ensuring good picture brightness when used in night environments.

[0154] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A positive distortion fisheye lens, characterized in that: The lens system includes a first lens to a tenth lens in sequence from the object side to the image side along an optical axis, wherein each of the first lens to the tenth lens includes an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; The first lens has a negative refractive power, and the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; The second lens has a negative refractive power, and the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; The third lens has a negative refractive power, and the object side surface and the image side surface of the third lens are concave; The fourth lens has a negative refractive power, and the object side surface of the fourth lens is a convex surface, and the image side surface is a concave surface; The fifth lens has a positive refractive power, and the object side surface and the image side surface of the fifth lens are convex; The sixth lens has a positive refractive power, and the object side surface of the sixth lens is a concave surface, and the image side surface is a convex surface; The seventh lens has a positive refractive power, and the object side surface of the seventh lens is a flat surface, and the image side surface is a convex surface; The eighth lens has a negative refractive power, and the object side surface of the eighth lens is a concave surface, and the image side surface is a convex surface; The ninth lens has a positive refractive power, and the object side surface and the image side surface of the ninth lens are convex; The tenth lens has a negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface is a convex surface; The orthodistorted fisheye lens has only the above ten lenses with refractive power; Meet the following conditions: 15<|(f1 / f)|<18, 6<|(f2 / f)|<7, 4<|(f3 / f)|<5, 11<|(f4 / f)|<12, 4<|(f5 / f)|<5, 15<|(f6 / f)|<19, 3.5<|(f7 / f)|<4.5, 6.5<|(f8 / f)|<7.5, 3<|(f9 / f)|<3.5, 5.5<|(f10 / f)|<6.5, Among them, f is the focal length of the lens, f1, f2, f3, f4, f5, f6, f7, f8, f9, and f10 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens respectively.

2. The orthodistortion fisheye lens according to claim 1, characterized in that: The image side surface of the fifth lens and the object side surface of the sixth lens are glued to each other and meet the following condition: |vd5-vd6|>25, wherein vd5 is the Abbe coefficient of the fifth lens, and vd6 is the Abbe coefficient of the sixth lens.

3. The orthodistortion fisheye lens according to claim 1, characterized in that: The image side surface of the seventh lens and the object side surface of the eighth lens are glued to each other and meet the following condition: |vd7-vd8|>40, wherein vd7 is the Abbe coefficient of the seventh lens, and vd8 is the Abbe coefficient of the eighth lens.

4. The orthodistortion fisheye lens according to claim 1, characterized in that: The image side surface of the ninth lens and the object side surface of the tenth lens are glued to each other and meet the following condition: |vd9-vd10|>30, wherein vd9 is the Abbe coefficient of the ninth lens, and vd10 is the Abbe coefficient of the tenth lens.

5. The orthodistortion fisheye lens according to claim 1, characterized in that: The seventh lens and the ninth lens are both made of materials with a negative refractive index temperature coefficient dn / dt and meet the following conditional formula: vd7>65, vd9>60, wherein vd7 is the Abbe coefficient of the seventh lens and vd9 is the Abbe coefficient of the ninth lens.

6. The orthodistortion fisheye lens according to claim 1, characterized in that: The first lens, the second lens, the third lens and the fourth lens are all in the shape of straw hats.

7. The orthodistortion fisheye lens according to claim 1, characterized in that: The second lens and the fourth lens are both glass aspherical lenses, the remaining lenses are glass spherical lenses, and a stop is provided between the sixth lens and the seventh lens.

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