An ultra-wide-angle lens

Abstract

The application discloses an ultra-wide-angle 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 and a ninth lens arranged in sequence along an optical axis from an object plane to an image plane, wherein the first lens has a negative focal length, the second lens has a negative focal length, the third lens has a positive focal length, the fourth lens has a positive focal length, the fifth lens has a positive focal length, the sixth lens has a positive focal length, the seventh lens has a negative focal length, the eighth lens has a positive focal length, and the ninth lens has a negative focal length. The ultra-wide-angle lens provided by the embodiment of the application has a field of view of 200 degrees, a maximum aperture number of 1.8 and a maximum imaging circle diameter of 7 mm, and is a high-pixel ultra-wide-angle lens. In addition, the ultra-wide-angle lens is composed of only nine lenses, has a compact structure, a small volume and a small total optical length, and is low in cost and weight.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and more particularly to an ultra-wide-angle lens. Background Technology

[0002] As the market becomes increasingly demanding in terms of lens parameters and performance, wide-angle lenses, due to their ability to provide a wider field of view, are widely used in industries such as automotive, action video, and panoramic shooting.

[0003] To achieve a wider field of view, lenses require increasingly larger field of view angles. Improving resolution while maintaining the range of the lens's field of view has become a challenge in lens design. Summary of the Invention

[0004] This invention provides an ultra-wide-angle lens to achieve a high-resolution ultra-wide-angle lens.

[0005] The present invention provides an ultra-wide-angle lens, 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, and a ninth lens arranged sequentially along the optical axis from the object plane to the image plane;

[0006] The first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, the sixth lens has positive optical power, the seventh lens has negative optical power, the eighth lens has positive optical power, and the ninth lens has negative optical power.

[0007] Optionally, the fifth lens, the sixth lens, and the ninth lens are all aspherical lenses, while the first lens, the second lens, the third lens, the fourth lens, the seventh lens, and the eighth lens are all glass spherical lenses.

[0008] Optionally, the object-side surface of the first lens is convex, and the image-side surface is concave.

[0009] The object-side surface of the second lens is concave, and the image-side surface is also concave.

[0010] The object-side surface of the third lens is convex, and the image-side surface is also convex.

[0011] The object-side surface of the fourth lens is concave, and the image-side surface is convex.

[0012] The object-side surface of the fifth lens is convex, and the image-side surface is concave.

[0013] The object-side surface of the sixth lens is convex, and the image-side surface is also convex.

[0014] The object-side surface of the seventh lens is convex, and the image-side surface is concave.

[0015] The object-side surface of the eighth lens is convex, and the image-side surface is also convex.

[0016] The object-side surface of the ninth lens is concave, and the image-side surface is also concave.

[0017] Optionally, the optical power of the ultra-wide-angle lens is... The optical power of the first lens is The optical power of the second lens is The optical power of the third lens is The optical power of the fourth lens is: The optical power of the fifth lens is The optical power of the sixth lens is: The optical power of the seventh lens is The optical power of the eighth lens is: The optical power of the ninth lens is: in:

[0018]

[0019]

[0020]

[0021] Optionally, the first lens has a refractive index of n1 and a dispersion coefficient of v1; the second lens has a refractive index of n2 and a dispersion coefficient of v2; the third lens has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens has a refractive index of n4 and a dispersion coefficient of v4; the fifth lens has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens has a refractive index of n8 and a dispersion coefficient of v8; and the ninth lens has a refractive index of n9 and a dispersion coefficient of v9; wherein:

[0022] 1.630≤n1≤2.105; 25.47≤v1≤55.33;

[0023] 1.346≤n²≤1.75²; 61.47≤v²≤75.13;

[0024] 1.440≤n3≤1.914; 25.47≤v3≤31.13;

[0025] 1.561≤n4≤2.017;33.48≤v4≤40.92;

[0026] 1.520≤n5≤2.035; 22.50≤v5≤34.21;

[0027] 1.459≤n6≤1.925; 40.50≤v6≤70.18;

[0028] 1.607≤n7≤1.964; 23.13≤v7≤28.27;

[0029] 1.434≤n8≤1.774; 45.00≤v8≤75.13;

[0030] 1.570≤n9≤2.028; 31.59≤v9≤60.61.

[0031] Optionally, the image-side surface of the ninth lens is an arc-shaped surface.

[0032] Optionally, the diameter of the object side of the first lens is IC1, and the diameter of the image side of the first lens is IC2, wherein IC1 / IC2≤3.

[0033] Optionally, the ultra-wide-angle lens may also include an aperture stop;

[0034] The aperture is located in the optical path between the fifth lens and the sixth lens.

[0035] Optionally, the second lens and the third lens form a first cemented lens group.

[0036] Optionally, the seventh lens and the eighth lens form a second cemented lens group.

[0037] The ultra-wide-angle lens provided in this embodiment of the invention achieves a high-pixel ultra-wide-angle lens with a field of view of 200°, a maximum aperture of 1.8, and a maximum imaging circle diameter of 7mm by setting nine lenses and reasonably allocating the optical power of each lens. At the same time, the ultra-wide-angle lens is composed of only nine lenses, with a compact structure, which makes the ultra-wide-angle lens have a small size and a small total optical length, reducing the cost and weight of the ultra-wide-angle lens.

[0038] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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.

[0040] Figure 1 This is a schematic diagram of the structure of an ultra-wide-angle lens provided in an embodiment of the present invention;

[0041] Figure 2 This is a spherical aberration curve of an ultra-wide-angle lens provided in Embodiment 1 of the present invention;

[0042] Figure 3 This is a chromatic aberration curve diagram of an ultra-wide-angle lens provided in Embodiment 1 of the present invention;

[0043] Figure 4 This is a field curvature distortion diagram of an ultra-wide-angle lens provided in Embodiment 1 of the present invention;

[0044] Figure 5 The MTF diagram of the ultra-wide-angle lens provided in Embodiment 1 of the present invention;

[0045] Figure 6 This is a schematic diagram of the structure of the ultra-wide-angle lens provided in Embodiment 2 of the present invention;

[0046] Figure 7 This is a spherical aberration curve of an ultra-wide-angle lens provided in Embodiment 2 of the present invention;

[0047] Figure 8 This is a chromatic aberration curve diagram of an ultra-wide-angle lens provided in Embodiment 2 of the present invention;

[0048] Figure 9 This is a field curvature distortion diagram of an ultra-wide-angle lens provided in Embodiment 2 of the present invention;

[0049] Figure 10 The MTF diagram of the ultra-wide-angle lens provided in Embodiment 2 of the present invention;

[0050] Figure 11 This is a schematic diagram of the structure of the ultra-wide-angle lens provided in Embodiment 3 of the present invention;

[0051] Figure 12 This is a spherical aberration curve of the ultra-wide-angle lens provided in Embodiment 3 of the present invention;

[0052] Figure 13 This is a chromatic aberration curve diagram of an ultra-wide-angle lens provided in Embodiment 3 of the present invention;

[0053] Figure 14 This is a field curvature distortion diagram of an ultra-wide-angle lens provided in Embodiment 3 of the present invention;

[0054] Figure 15 This is the MTF diagram of the ultra-wide-angle lens provided in Embodiment 3 of the present invention. Detailed Implementation

[0055] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0057] Figure 1 This is a schematic diagram of the structure of an ultra-wide-angle lens provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the ultra-wide-angle lens provided in this embodiment of the invention includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, an eighth lens 18, and a ninth lens 19 arranged sequentially along the optical axis from the object plane to the image plane. The first lens 11 has negative optical power, the second lens 12 has negative optical power, the third lens 13 has positive optical power, the fourth lens 14 has positive optical power, the fifth lens 15 has positive optical power, the sixth lens 16 has positive optical power, the seventh lens 17 has negative optical power, the eighth lens 18 has positive optical power, and the ninth lens 19 has negative optical power.

[0058] Specifically, optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light rays. The larger the absolute value of the optical power, the stronger the bending ability of light rays; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light rays is converging; when the optical power is negative, the refraction of light rays is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a system formed by multiple lenses (i.e., a lens group).

[0059] In the ultra-wide-angle lens provided in this embodiment, each lens can be fixed in a lens barrel. Figure 1 (Not shown in the text) but not limited to this.

[0060] The optical power of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, the eighth lens 18, and the ninth lens 19 are arranged in a negative-negative-positive-positive-positive-positive-negative-positive-negative pattern, which enables the ultra-wide-angle lens to achieve a field of view of 200° and a maximum aperture of f / 1.8. At the same time, by reasonably distributing the optical power of each lens, light can be propagated smoothly, and light will not be excessively deflected on any one surface, thereby reducing aberrations, improving the image quality of the ultra-wide-angle lens, and reducing the sensitivity of the ultra-wide-angle lens.

[0061] It should be noted that the ninth lens 19 uses negative optical power, which can increase the height of light to obtain a larger image plane, so that the maximum imaging circle diameter of the ultra-wide-angle lens can reach 7mm.

[0062] Furthermore, the ultra-wide-angle lens provided in this embodiment consists of only nine lenses and has a compact structure, which enables the ultra-wide-angle lens to have a small size and a small total optical length, thereby helping to reduce the cost and weight of the ultra-wide-angle lens.

[0063] In summary, the ultra-wide-angle lens provided by this invention, by setting nine lenses and rationally allocating the optical power of each lens, achieves a high-pixel ultra-wide-angle lens with a field of view of 200°, a maximum aperture of 1.8, and a maximum imaging circle diameter of 7mm. At the same time, the ultra-wide-angle lens consists of only nine lenses, with a compact structure, resulting in a smaller size and shorter overall optical length, thus reducing the cost and weight of the ultra-wide-angle lens.

[0064] As a feasible implementation, the fifth lens 15, the sixth lens 16 and the ninth lens 19 are all aspherical lenses, and the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the seventh lens 17 and the eighth lens 18 are all glass spherical lenses.

[0065] Among them, glass lenses have higher transmittance, which can reduce the loss of light energy and enable the image sensor to receive more light energy. In this embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the seventh lens 17 and the eighth lens 18 are glass spherical lenses, which can enable the ultra-wide-angle lens to have better imaging effect in low-light environments.

[0066] Meanwhile, by setting the fifth lens 15, the sixth lens 16, and the ninth lens 19 as aspherical lenses, the spherical aberration and distortion of the ultra-wide-angle lens can be corrected, thereby further improving the resolution of the ultra-wide-angle lens.

[0067] It should be noted that the ninth lens 19 is an aspherical lens, which can increase the height of the light rays to obtain a larger image plane.

[0068] Furthermore, since the cost of plastic lenses is much lower than that of glass lenses, in some embodiments, at least one of the fifth lens 15, the sixth lens 16, and the ninth lens 19 can be configured as a plastic aspherical lens to further reduce the cost and weight of the ultra-wide-angle lens, but is not limited thereto.

[0069] In some other embodiments, at least one of the fifth lens 15, the sixth lens 16, and the ninth lens 19 may be a glass lens, so that the lens has the advantages of high hardness, strong wear resistance, long service life and is not easily deformed by temperature, thereby making the performance of the ultra-wide-angle lens more stable. The embodiments of the present invention do not specifically limit this.

[0070] It should be noted that the material of the aforementioned plastic aspherical lens can be any plastic material known to those skilled in the art, and the material of the glass spherical lens can be any type of glass material known to those skilled in the art. The embodiments of the present invention will not elaborate on this nor limit it.

[0071] As one possible implementation method, please refer to [reference]. Figure 1 The object-side surface of the first lens 11 is convex, and the image-side surface is concave; the object-side surface of the second lens 12 is concave, and the image-side surface is concave; the object-side surface of the third lens 13 is convex, and the image-side surface is convex; the object-side surface of the fourth lens 14 is concave, and the image-side surface is convex; the object-side surface of the fifth lens 15 is convex, and the image-side surface is concave; the object-side surface of the sixth lens 16 is convex, and the image-side surface is convex; the object-side surface of the seventh lens 17 is convex, and the image-side surface is concave; the object-side surface of the eighth lens 18 is convex, and the image-side surface is convex; and the object-side surface of the ninth lens 19 is concave, and the image-side surface is concave.

[0072] The surface shape of each lens can affect the direction of light propagation. In this embodiment, by reasonably matching the surface shapes of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15, it is beneficial to enable the ultra-wide-angle lens to have a large field of view. At the same time, by reasonably matching the surface shapes of the sixth lens 16, the seventh lens 17, the eighth lens 18, and the ninth lens 19, so that the surface shapes of the six lenses 16, the seventh lens 17, the eighth lens 18, and the ninth lens 19 are matched with their optical power, a larger imaging surface and higher pixel count can be achieved, thus making it compatible with large-area imaging chips.

[0073] As a feasible implementation method, the optical power of the ultra-wide-angle lens is The optical power of the first lens 11 is: The optical power of the second lens 12 is The optical power of the third lens 13 is: The optical power of the fourth lens 14 is The optical power of the fifth lens 15 is The optical power of the sixth lens 16 is The optical power of the seventh lens 17 is The optical power of the eighth lens 18 is The optical power of the ninth lens 19 is in,

[0074] By rationally allocating the optical power of each lens, aberrations of the ultra-wide-angle lens can be further corrected and its resolving power improved. In particular, setting the optical power of the lens in the middle part of the ultra-wide-angle lens is beneficial to increasing the aperture of the ultra-wide-angle lens, enabling the ultra-wide-angle lens to obtain clear and bright images even in low-light environments.

[0075] As a feasible implementation, the first lens 11 has a refractive index of n1 and a dispersion coefficient of v1; the second lens 12 has a refractive index of n2 and a dispersion coefficient of v2; the third lens 13 has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens 14 has a refractive index of n4 and a dispersion coefficient of v4; the fifth lens 15 has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens 16 has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens 17 has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens 18 has a refractive index of n8 and a dispersion coefficient of v8; and the ninth lens 19 has a refractive index of n9 and a dispersion coefficient of v9; wherein, 1.630 ≤ n1 ≤ 2.105; 25.47 ≤ v1 ≤ 55.3 3; 1.346≤n2≤1.752; 61.47≤v2≤75.13; 1.440≤n3≤1.914; 25.47≤v3≤31.13; 1.561≤n4≤2.017; 33.48≤v4≤40.92; 1.520≤n5≤2.035; 22.50≤v5≤34.21; 1.459≤n6≤1.925; 40.50≤v6≤70.18; 1.607≤n7≤1.964; 23.13≤v7≤28.27; 1.434≤n8≤1.774; 45.00≤v8≤75.13; 1.570≤n9≤2.028; 31.59≤v9≤60.61.

[0076] The refractive index is the ratio of the speed of light in a vacuum to the speed of light in the medium. It is mainly used to describe a material's ability to refract light, and different materials have different refractive indices.

[0077] The dispersion coefficient (Abbe number) is an index used to represent the dispersion ability of a transparent medium. The more severe the dispersion of the medium, the smaller the dispersion coefficient; conversely, the less severe the dispersion of the medium, the larger the dispersion coefficient.

[0078] In this embodiment, by matching the optical power with a suitable refractive index and dispersion coefficient, the aberrations of the ultra-wide-angle lens can be further corrected, thereby improving the resolution of the ultra-wide-angle lens.

[0079] As a possible implementation method, such as Figure 1 As shown, the image-side surface of the ninth lens 19 is an arc-shaped surface.

[0080] In particular, by setting the image side of the ninth lens 19 to be an arc-shaped surface, the field curvature at the high position of the large image can be corrected, thereby improving the resolution at the high position of the large image and meeting the requirements of the large target surface.

[0081] As a feasible implementation, the diameter of the object side of the first lens 11 is IC1, and the diameter of the image side of the first lens 11 is IC2, wherein IC1 / IC2≤3.

[0082] Specifically, by setting the diameter IC1 of the object side of the first lens 11 and the diameter IC2 of the image side of the first lens 11 to satisfy IC1 / IC2≤3, the incident angles of different field-of-view rays on the first lens 11 are significantly different, so as to better achieve a large field of view and correct the distortion of the ultra-wide-angle lens, thus realizing an ultra-wide-angle lens with small distortion.

[0083] As one possible implementation method, please refer to [reference]. Figure 1 The ultra-wide-angle lens also includes an aperture stop 21, which is located in the optical path between the fifth lens 15 and the sixth lens 16.

[0084] The direction of beam propagation can be adjusted by setting the aperture 21.

[0085] In this embodiment, by placing the aperture stop 21 in the optical path between the fifth lens 15 and the sixth lens 16, the aperture of the ultra-wide-angle lens can be further improved, enabling the ultra-wide-angle lens to obtain clear and bright images even in low-light environments.

[0086] As one possible implementation method, please refer to [reference]. Figure 1 The second lens 12 and the third lens 13 form the first cemented lens group 31.

[0087] By setting the second lens 12 and the third lens 13 to form the first cemented lens group 31, chromatic aberration can be minimized or eliminated, allowing for sufficient correction of chromatic aberration in the ultra-wide-angle lens. Simultaneously, the air gap between the second lens 12 and the third lens 13 can be effectively reduced, further decreasing the overall length of the lens. Furthermore, cementing the second lens 12 and the third lens 13 reduces the number of assembly components, simplifying the assembly process in lens manufacturing, lowering costs, and reducing tolerance sensitivity issues such as tilting / eccentricity that occur during lens assembly.

[0088] As one possible implementation method, please refer to [reference]. Figure 1 The seventh lens 17 and the eighth lens 18 form the second cemented lens group 32.

[0089] By setting the seventh lens 17 and the eighth lens 18 to form the second cemented lens group 32, chromatic aberration can be minimized or eliminated, allowing for sufficient correction of chromatic aberration in the ultra-wide-angle lens. Simultaneously, the air gap between the seventh lens 17 and the eighth lens 18 can be effectively reduced, further decreasing the overall lens length. Furthermore, cementing the seventh lens 17 and the eighth lens 18 reduces the number of assembly components, simplifying the assembly process in lens manufacturing, lowering costs, and reducing tolerance sensitivity issues such as tilting / eccentricity that occur during lens assembly.

[0090] As one possible implementation method, please refer to [reference]. Figure 1 The ultra-wide-angle lens also includes a flat glass plate 41, which is located on the image-side side of the ninth lens 19. The flat glass plate 41 serves to protect the imaging chip.

[0091] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the ultra-wide-angle lens applicable to the above-described embodiments.

[0092] Example 1

[0093] Continue to refer to Figure 1 The ultra-wide-angle lens provided in Embodiment 1 of the present invention includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, an eighth lens 18, and a ninth lens 19 arranged sequentially along the optical axis from the object plane to the image plane. An aperture stop 21 is located in the optical path between the fifth lens 15 and the sixth lens 16. The second lens 12 and the third lens 13 form a first cemented lens group 31, and the seventh lens 17 and the eighth lens 18 form a second cemented lens group 32. A flat glass plate 41 is located on one side of the image plane of the ninth lens 19.

[0094] Table 1 details the specific optical physical parameters of each lens in the ultra-wide-angle lens provided in Embodiment 1 of the present invention, using a feasible implementation method. The ultra-wide-angle lens in Table 1 corresponds to... Figure 1 The ultra-wide-angle lens shown.

[0095] Table 1 Design values ​​of optical physical parameters for ultra-wide-angle lenses

[0096]

[0097]

[0098] The surface numbering is based on the sequential order of the lenses' surfaces. For example, surface number "S1" represents the object-side surface of the first lens, surface number "S2" represents the image-side surface of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the degree of curvature of the lens surface; a positive value indicates that the surface bends towards the object surface with the center closer to the image surface, while a negative value indicates that the surface bends towards the image surface with the center closer to the object surface. "PL" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface. Because the different number of decimal places for each parameter can cause focusing errors, the thickness of the 19th surface (S19) is not given a specific value. The value can be adjusted as needed to achieve a clear focus. "Image" indicates the imaging surface; "Material (nd)" represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A space indicates the current location is air, with a refractive index of 1. "Material (vd)" represents the dispersion coefficient (Abbe number), which is the dispersion characteristic of the material between the current surface and the next surface. A space indicates the current location is air. "Half-diameter" represents the lens's half-aperture.

[0099] In this embodiment, the aspherical lens of the ultra-wide-angle lens can satisfy the following formula:

[0100]

[0101] Where Z is the aspherical elevation, v is the fundamental curvature at the vertex, k is the conic section constant, r is the radial coordinate perpendicular to the optical axis, and a i a is the coefficient of the 2i-th power term. i r 2i For aspherical surfaces, the term is of degree 2i.

[0102] For example, Table 2 details the aspherical coefficients of each lens in this embodiment one of feasible implementations.

[0103] Table 2 Design values ​​of aspherical coefficients for each lens in ultra-wide-angle lenses.

[0104]

[0105] The ultra-wide-angle lens provided in this embodiment achieves the following technical specifications:

[0106] Focal length: 2.122mm

[0107] Aperture: F1.86

[0108] Field of view: 200°

[0109] Overall optical length: 18.05mm

[0110] Furthermore, Figure 2 This is a spherical aberration curve diagram of an ultra-wide-angle lens provided in Embodiment 1 of the present invention. In the diagram, the vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, the vertical vertex represents the pupil vertex, and the horizontal direction represents the spherical aberration at different wavelengths, in millimeters (mm). Different linear curves in the diagram represent different wavelengths of the ultra-wide-angle lens image. Figure 2 As shown, the pupil radius is 0.5736mm, and the abscissa values ​​for different wavelengths (0.436μm, 0.470μm, 0.510μm, 0.555μm, 0.610μm and 0.650μm) are all within ±0.03mm, indicating that the spherical aberration of this ultra-wide-angle lens is well controlled and can meet the needs of consumers.

[0111] Figure 3 This is a chromatic aberration curve diagram of an ultra-wide-angle lens provided in Embodiment 1 of the present invention. In the diagram, the vertical direction represents the normalized field of view, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum field of view radius. The horizontal direction represents the offset within a meridian range based on 0.555 μm, in micrometers (μm). The maximum field of view is 100Deg. The numbers on the curves in the diagram represent the wavelengths represented by the curves, in micrometers (μm). Figure 3 As shown, the chromatic aberration of the ultra-wide-angle lens provided in this embodiment is controlled within the range of (-2μm, +4μm) for different wavelengths in the range of 0.436μm to 0.650μm. This indicates that the chromatic aberration of the ultra-wide-angle lens is well controlled and can meet the application requirements of ultra-wide-angle lenses.

[0112] Figure 4 This is a field curvature distortion diagram of an ultra-wide-angle lens provided in Embodiment 1 of the present invention. In the coordinate system on the left side of the diagram, the horizontal coordinate represents the magnitude of the field curvature, in millimeters (mm); the vertical coordinate represents the normalized image height, which has no unit; where T represents meridion and S represents arc distortion; from Figure 4It can be seen that the ultra-wide-angle lens provided in this embodiment effectively controls the field curvature of light with a wavelength of 555nm, that is, during imaging, the difference in image quality between the center and the periphery is small; in the coordinate system on the right, the horizontal axis represents the magnitude of F-Theta distortion, in %; the vertical axis represents the normalized image height, which has no unit; from Figure 4 As can be seen, the distortion of the ultra-wide-angle lens provided in this embodiment is well corrected when the main wavelength is 555nm.

[0113] Figure 5 This is an MTF chart of an ultra-wide-angle lens provided in Embodiment 1 of the present invention. The MTF chart represents the overall imaging quality of the ultra-wide-angle lens; a higher MTF value indicates a clearer image. Figure 5 As shown, the horizontal axis represents spatial frequency, with units of lp / mm; the vertical axis represents normalized MTF (OTF coefficients), which has no unit; where T represents metropolis and S represents arc distance; different lines represent different fields of view; by Figure 5 As can be seen, the ultra-wide-angle lens provided in this embodiment has excellent imaging quality over a wide field of view.

[0114] Example 2

[0115] Figure 6 This is a schematic diagram of the structure of the ultra-wide-angle lens provided in Embodiment 2 of the present invention, as shown below. Figure 6 As shown, the ultra-wide-angle lens provided in Embodiment 2 of the present invention includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, an eighth lens 18, and a ninth lens 19 arranged sequentially along the optical axis from the object plane to the image plane. An aperture stop 21 is located in the optical path between the fifth lens 15 and the sixth lens 16. The second lens 12 and the third lens 13 form a first cemented lens group 31, and the seventh lens 17 and the eighth lens 18 form a second cemented lens group 32. A flat glass plate 41 is located on one side of the image plane of the ninth lens 19.

[0116] Table 3 details the specific optical physical parameters of each lens in the ultra-wide-angle lens provided in Embodiment 2 of the present invention, according to a feasible implementation method.

[0117] Table 3 Design values ​​of optical physical parameters for ultra-wide-angle lenses

[0118] Face number Surface type radius of curvature thickness Materials (nd) Materials (vd) Half diameter S1 spherical 15.1090 2.2466 1.811 50.3 7.5711 S2 spherical 3.3215 3.3301 3.1149 S3 spherical -26.4019 0.3992 1.495 68.3 3.0482 S4 spherical 4.9272 2.3658 1.6 28.3 2.4317 S5 spherical -20.4403 0.2884 1.9993 S6 spherical -4.7382 2.3248 1.734 37.2 1.8539 S7 spherical -4.6167 0.0138 1.7642 S8 aspherical 10.9541 0.4872 1.85 25 1.5660 S9 aspherical 11.1706 0.2319 1.4470 STO spherical PL -0.1426 1.4287 S11 aspherical 6.0836 1.5077 1.621 63.8 1.4293 S12 aspherical -3.6760 0.0566 1.6930 S13 spherical 63.9447 0.8005 1.785 25.7 1.7435 S14 spherical 2.3870 2.9153 1.613 50 1.7934 S15 spherical -6.1866 0.3948 2.2491 S16 aspherical -15.4252 0.6990 1.744 55.1 2.2505 S17 aspherical 5.1975 0.7000 2.8979 S18 spherical PL 0.6100 1.5168 64.199 3.2891 S19 spherical PL Focus position 3.4339 Image spherical PL

[0119] The surface numbering is based on the sequential order of the lenses' surfaces. For example, surface number "S1" represents the object-side surface of the first lens, surface number "S2" represents the image-side surface of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the degree of curvature of the lens surface; a positive value indicates that the surface bends towards the object surface with the center closer to the image surface, while a negative value indicates that the surface bends towards the image surface with the center closer to the object surface. "PL" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface. Because the different number of decimal places for each parameter can cause focusing errors, the thickness of the 19th surface (S19) is not given a specific value. The value can be adjusted as needed to achieve a clear focus. "Image" indicates the imaging surface; "Material (nd)" represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A space indicates the current location is air, with a refractive index of 1. "Material (vd)" represents the dispersion coefficient (Abbe number), which is the dispersion characteristic of the material between the current surface and the next surface. A space indicates the current location is air. "Half-diameter" represents the lens's half-aperture.

[0120] In this embodiment, the aspherical lens of the ultra-wide-angle lens can satisfy the following formula:

[0121]

[0122] Where Z is the sag of the aspherical surface, c is the fundamental curvature at the vertex, k is the conic section constant, r is the radial coordinate perpendicular to the optical axis, and a i a is the coefficient of the 2i-th power term. i r 2i For aspherical surfaces, the term is of degree 2i.

[0123] For example, Table 4 details the aspherical coefficients of each lens in this embodiment two according to a feasible implementation.

[0124] Table 4. Design values ​​of aspherical coefficients for each lens in ultra-wide-angle lenses.

[0125]

[0126] The ultra-wide-angle lens provided in this embodiment two achieves the following technical specifications:

[0127] Focal length: 2.147mm

[0128] Aperture: F1.8

[0129] Field of view: 200°

[0130] Overall optical length: 19.23mm

[0131] Furthermore, Figure 7This is a spherical aberration curve diagram of an ultra-wide-angle lens provided in Embodiment 2 of the present invention. In the diagram, the vertical direction represents the normalized 0-field pupil plane, where 0 represents the pupil center, the vertical vertex represents the pupil vertex, and the horizontal direction represents the spherical aberration at different wavelengths, in millimeters (mm). Different linear curves in the diagram represent different wavelengths of the ultra-wide-angle lens image. Figure 7 As shown, the pupil radius is 0.5965mm, and the abscissa values ​​for different wavelengths (0.436μm, 0.470μm, 0.510μm, 0.555μm, 0.610μm and 0.650μm) are all within ±0.02mm, indicating that the spherical aberration of this ultra-wide-angle lens is well controlled and can meet the needs of consumers.

[0132] Figure 8 This is a chromatic aberration curve diagram of the ultra-wide-angle lens provided in Embodiment 2 of the present invention. In the diagram, the vertical direction represents the normalized field of view, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum field of view radius. The horizontal direction represents the offset within a meridian range based on 0.555 μm, in micrometers (μm). The maximum field of view is 100Deg. The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). Figure 8 As shown, the chromatic aberration of the ultra-wide-angle lens provided in this embodiment is controlled within the range of (-1μm, +5μm) for different wavelengths in the range of 0.436μm to 0.650μm, indicating that the chromatic aberration of the ultra-wide-angle lens is well controlled and can meet the application requirements of ultra-wide-angle lenses.

[0133] Figure 9 This is a field curvature distortion diagram of an ultra-wide-angle lens provided in Embodiment 2 of the present invention. In the coordinate system on the left side of the diagram, the horizontal coordinate represents the magnitude of the field curvature, in millimeters (mm); the vertical coordinate represents the normalized image height, which has no unit; where T represents meridion and S represents arc distortion; from Figure 9 It can be seen that the ultra-wide-angle lens provided in this embodiment effectively controls the field curvature of light with a wavelength of 555nm, that is, during imaging, the difference in image quality between the center and the periphery is small; in the coordinate system on the right, the horizontal axis represents the magnitude of F-Theta distortion, in %; the vertical axis represents the normalized image height, which has no unit; from Figure 9 As can be seen, the distortion of the ultra-wide-angle lens provided in this embodiment is well corrected when the main wavelength is 555nm.

[0134] Figure 10 This is an MTF chart of an ultra-wide-angle lens provided in Embodiment 2 of the present invention. The MTF chart represents the overall imaging quality of the ultra-wide-angle lens; a higher MTF value indicates a clearer image. Figure 10As shown, the horizontal axis represents spatial frequency, in lp / mm; the vertical axis represents normalized MTF (OTF coefficients), which has no unit; where T represents metropolis and S represents arc distance; different lines represent different fields of view. Figure 10 As can be seen, the ultra-wide-angle lens provided in this embodiment has excellent imaging quality over a wide field of view.

[0135] Example 3

[0136] Figure 11 This is a schematic diagram of the structure of the ultra-wide-angle lens provided in Embodiment 3 of the present invention, as shown below. Figure 11 As shown, the ultra-wide-angle lens provided in Embodiment 3 of the present invention includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, an eighth lens 18, and a ninth lens 19 arranged sequentially along the optical axis from the object plane to the image plane. An aperture stop 21 is located in the optical path between the fifth lens 15 and the sixth lens 16. The second lens 12 and the third lens 13 form a first cemented lens group 31, and the seventh lens 17 and the eighth lens 18 form a second cemented lens group 32. A flat glass plate 41 is located on one side of the image plane of the ninth lens 19.

[0137] Table 5 details the specific optical physical parameters of each lens in the ultra-wide-angle lens provided in Embodiment 3 of the present invention, according to a feasible implementation method.

[0138] Table 5 Design values ​​of optical physical parameters for ultra-wide-angle lenses

[0139]

[0140]

[0141] The surface numbering is based on the sequential order of the lenses' surfaces. For example, surface number "S1" represents the object-side surface of the first lens, surface number "S2" represents the image-side surface of the first lens, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the degree of curvature of the lens surface; a positive value indicates that the surface bends towards the object surface with the center closer to the image surface, while a negative value indicates that the surface bends towards the image surface with the center closer to the object surface. "PL" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface. Because the different number of decimal places for each parameter can cause focusing errors, the thickness of the 19th surface (S19) is not given a specific value. The value can be adjusted as needed to achieve a clear focus. "Image" indicates the imaging surface; "Material (nd)" represents the refractive index, which is the ability of the material between the current surface and the next surface to deflect light. A space indicates the current location is air, with a refractive index of 1. "Material (vd)" represents the dispersion coefficient (Abbe number), which is the dispersion characteristic of the material between the current surface and the next surface. A space indicates the current location is air. "Half-diameter" represents the lens's half-aperture.

[0142] In this embodiment, the aspherical lens of the ultra-wide-angle lens can satisfy the following formula:

[0143]

[0144] Where Z is the sag of the aspherical surface, c is the fundamental curvature at the vertex, k is the conic section constant, r is the radial coordinate perpendicular to the optical axis, and a i a is the coefficient of the 2i-th power term. i r 2i For aspherical surfaces, the term is of degree 2i.

[0145] For example, Table 6 details the aspherical coefficients of each lens in this embodiment three according to a feasible implementation.

[0146] Table 6 Design values ​​of aspherical coefficients for each lens in ultra-wide-angle lenses.

[0147]

[0148] The ultra-wide-angle lens provided in this embodiment three achieves the following technical specifications:

[0149] Focal length: 2.08mm

[0150] Aperture: F1.8

[0151] Field of view: 200°

[0152] Overall optical length: 19mm

[0153] Furthermore, Figure 12This is a spherical aberration curve diagram of an ultra-wide-angle lens provided in Embodiment 3 of the present invention. In the diagram, the vertical direction represents the normalized 0-field pupil plane, 0 represents the pupil center, the vertical vertex represents the pupil vertex, and the horizontal direction represents the spherical aberration of different wavelengths, in millimeters (mm). Different linear curves in the diagram represent different wavelengths of the ultra-wide-angle lens image. Figure 12 As shown, the pupil radius is 0.5802mm, and the abscissa values ​​for different wavelengths (0.436μm, 0.470μm, 0.510μm, 0.555μm, 0.610μm and 0.650μm) are all within ±0.03mm, indicating that the spherical aberration of this ultra-wide-angle lens is well controlled and can meet the needs of consumers.

[0154] Figure 13 This is a chromatic aberration curve diagram of the ultra-wide-angle lens provided in Embodiment 3 of the present invention. In the diagram, the vertical direction represents the normalized field of view, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum field of view radius. The horizontal direction represents the offset within a meridian range based on 0.555 μm, in micrometers (μm). The maximum field of view is 100Deg. The numbers on the curves in the diagram represent the wavelengths represented by those curves, in micrometers (μm). Figure 13 As shown, the chromatic aberration of the ultra-wide-angle lens provided in this embodiment is controlled within the range of (-1μm, +4μm) for different wavelengths in the range of 0.436μm to 0.650μm, indicating that the chromatic aberration of the ultra-wide-angle lens is well controlled and can meet the application requirements of ultra-wide-angle lenses.

[0155] Figure 14 This is a field curvature distortion diagram of an ultra-wide-angle lens provided in Embodiment 3 of the present invention. In the coordinate system on the left side of the diagram, the horizontal coordinate represents the magnitude of the field curvature, in millimeters (mm); the vertical coordinate represents the normalized image height, which has no unit; where T represents meridion and S represents arc distortion; from Figure 14 It can be seen that the ultra-wide-angle lens provided in this embodiment effectively controls the field curvature of light with a wavelength of 555nm, that is, during imaging, the difference in image quality between the center and the periphery is small; in the coordinate system on the right, the horizontal axis represents the magnitude of F-Theta distortion, in %; the vertical axis represents the normalized image height, which has no unit; from Figure 14 As can be seen, the distortion of the ultra-wide-angle lens provided in this embodiment is well corrected when the main wavelength is 555nm.

[0156] Figure 15 This is an MTF chart of an ultra-wide-angle lens provided in Embodiment 3 of the present invention. The MTF chart represents the overall imaging quality of the ultra-wide-angle lens; a higher MTF value indicates a clearer image. Figure 15As shown, the horizontal axis represents spatial frequency, in lp / mm; the vertical axis represents normalized MTF (OTF coefficients), which has no unit; where T represents metropolis and S represents arc distance; different lines represent different fields of view. Figure 15 As can be seen, the ultra-wide-angle lens provided in this embodiment has excellent imaging quality over a wide field of view.

[0157] To provide a clearer explanation of the above embodiments, Table 7 details the specific optical physical parameters of each lens in the ultra-wide-angle lens provided in Embodiments 1 to 3 of the present invention.

[0158] Table 7 Design values ​​of optical physical parameters for ultra-wide-angle lenses

[0159]

[0160]

[0161] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An ultra-wide-angle lens, characterized in that, The ultra-wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially along the optical axis from the object plane to the image plane. The ultra-wide-angle lens has nine lenses with optical power. The first lens has negative optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, the sixth lens has positive optical power, the seventh lens has negative optical power, the eighth lens has positive optical power, and the ninth lens has negative optical power. The ultra-wide-angle lens has an optical power of φ, the first lens has an optical power of φ1, the second lens has an optical power of φ2, the third lens has an optical power of φ3, the fourth lens has an optical power of φ4, the fifth lens has an optical power of φ5, the sixth lens has an optical power of φ6, the seventh lens has an optical power of φ7, the eighth lens has an optical power of φ8, and the ninth lens has an optical power of φ9, wherein: -0.486<φ1 / φ<-0.338; -0.425<φ2 / φ<-0.232; 0.284<φ3 / φ<0.510; 0.058<φ4 / φ<0.088; 0.006<φ5 / φ<0.040; 0.446<φ6 / φ<0.659; -0.800<φ7 / φ<-0.601; 0.594<φ8 / φ<0.752; -0.460<φ9 / φ<-0.

350.

2. The ultra-wide-angle lens according to claim 1, characterized in that, The fifth, sixth, and ninth lenses are all aspherical lenses, while the first, second, third, fourth, seventh, and eighth lenses are all spherical glass lenses.

3. The ultra-wide-angle lens according to claim 1, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is concave, and the image-side surface is also concave. The object-side surface of the third lens is convex, and the image-side surface is also convex. The object-side surface of the fourth lens is concave, and the image-side surface is convex. The object-side surface of the fifth lens is convex, and the image-side surface is concave. The object-side surface of the sixth lens is convex, and the image-side surface is also convex. The object-side surface of the seventh lens is convex, and the image-side surface is concave. The object-side surface of the eighth lens is convex, and the image-side surface is also convex. The object-side surface of the ninth lens is concave, and the image-side surface is also concave.

4. The ultra-wide-angle lens according to claim 1, characterized in that, The first lens has a refractive index of n1 and a dispersion coefficient of v1; the second lens has a refractive index of n2 and a dispersion coefficient of v2; the third lens has a refractive index of n3 and a dispersion coefficient of v3; the fourth lens has a refractive index of n4 and a dispersion coefficient of v4; the fifth lens has a refractive index of n5 and a dispersion coefficient of v5; the sixth lens has a refractive index of n6 and a dispersion coefficient of v6; the seventh lens has a refractive index of n7 and a dispersion coefficient of v7; the eighth lens has a refractive index of n8 and a dispersion coefficient of v8; and the ninth lens has a refractive index of n9 and a dispersion coefficient of v9; wherein: 1.811≤n1≤2.051; 28.3≤v1≤50.3; 1.495≤n2≤1.593; v2=68.3; 1.6 ≤ n3 ≤ 1.74; v3 = 28.3; 1.734≤n4≤1.834; v4=37.2; 1.689≤n5≤1.85;25≤v5≤31.1; 1.621≤n6≤1.75;45≤v6≤63.8; n7=1.785; v7=25.7; 1.593≤n8≤1.613;50≤v8≤68.3; 1.744≤n9≤1.844; 35.1≤v9≤55.

1.

5. The ultra-wide-angle lens according to claim 1, characterized in that, The image-side surface of the ninth lens is arc-shaped.

6. The ultra-wide-angle lens according to claim 1, characterized in that, The ultra-wide-angle lens also includes an aperture stop; The aperture is located in the optical path between the fifth lens and the sixth lens.

7. The ultra-wide-angle lens according to claim 1, characterized in that, The second lens and the third lens together form the first cemented lens group.

8. The ultra-wide-angle lens according to claim 1, characterized in that, The seventh lens and the eighth lens together form the second cemented lens group.

Images