Large-view-field large-aperture vehicle-mounted panoramic optical lens

Abstract

The utility model relates to the technical field of optical lenses, and discloses a large-view-field large-aperture vehicle-mounted panoramic optical lens. Comprising a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power or negative focal power and a fifth lens with positive focal power or negative focal power which are sequentially arranged from an object side to an image side along an optical axis, the sixth lens has positive focal power; the seventh lens has negative focal power; wherein the fourth lens and the fifth lens form a balsaming lens; the sixth lens and the seventh lens form a balsaming lens; the aperture value of the panoramic optical lens meets the condition that FNO is less than or equal to 1.68. According to the panoramic optical lens provided by the utility model, the shapes and parameters of the plurality of lenses are optimized, so that the panoramic optical lens has the characteristics that the field angle is greater than 200 degrees, and the large aperture value is less than or equal to 1.68; and meanwhile, the system also has the characteristics of high image quality, small size, low cost, obvious ghosting elimination effect of an imaging picture and the like.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, specifically to a large field-of-view, large aperture automotive panoramic optical lens. Background Technology

[0002] With the rapid development and widespread use of the automotive industry, users are constantly improving their driving experience, leading to increasingly higher demands for enhanced driving and vehicle safety. Under the trend of integrating intelligent devices with autonomous driving technology, in-vehicle auxiliary vision systems are rapidly developing in the automotive electronics field. To avoid blind spots during driving, 360° panoramic lenses have become the first choice for in-vehicle cameras. However, in-vehicle 360 ​​systems also require high performance indicators to match technological advancements. Currently used 360° panoramic lenses suffer from poor image quality, narrow field of view, large size, and high cost, which are technical problems that urgently need to be solved. Utility Model Content

[0003] To address the shortcomings of existing 360° panoramic lenses, such as poor image quality, narrow field of view, large size, and high cost, which are urgent technical problems to be solved, this utility model provides a large field of view and large aperture vehicle-mounted panoramic optical lens.

[0004] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0005] In a first aspect, this utility model provides a large field of view and large aperture vehicle panoramic optical lens, comprising: a first lens having negative optical power, a second lens having negative optical power, a third lens having positive optical power, a fourth lens having positive or negative optical power, a fifth lens having positive or negative optical power, a sixth lens having positive optical power, and a seventh lens having negative optical power, arranged sequentially along the optical axis from the object side to the image side.

[0006] Wherein, the fourth lens and the fifth lens form a cemented lens; the sixth lens and the seventh lens form a cemented lens;

[0007] The aperture value of the panoramic optical lens satisfies: FNO≤1.68.

[0008] In some alternative implementations, the FOV, f, and h of the panoramic optical lens satisfy the following condition:

[0009] 50≤(FOV×f) / h≤54;

[0010] Wherein, FOV is the maximum field of view of the optical lens, h is the image height corresponding to the maximum field of view, and f is the effective focal length of the panoramic optical lens.

[0011] In some alternative implementations,

[0012] The object side of the first lens has a convex structure, and the image side of the first lens has a concave structure.

[0013] The object side of the second lens has a convex structure, and the image side of the second lens has a concave structure.

[0014] The object side of the third lens has a convex or concave structure, and the image side of the third lens has a convex structure.

[0015] The fourth lens has positive optical power, and the object side and image side of the fourth lens have a convex structure.

[0016] The fifth lens has negative optical power, and the object side and image side of the fifth lens have a concave structure;

[0017] The object-side and image-side surfaces of the sixth lens are convex.

[0018] The object side of the seventh lens has a concave structure, and the image side of the seventh lens has a convex structure.

[0019] In some alternative implementations,

[0020] The object side of the first lens has a convex structure, and the image side of the first lens has a concave structure.

[0021] The object side of the second lens has a convex structure, and the image side of the second lens has a concave structure.

[0022] The object side of the third lens has a convex or concave structure, and the image side of the third lens has a convex structure.

[0023] The fourth lens has negative optical power, and the object side and image side of the fourth lens have a concave structure.

[0024] The fifth lens has negative positive power, and the object side and image side of the fifth lens have a convex structure;

[0025] The object-side and image-side surfaces of the sixth lens are convex.

[0026] The object side of the seventh lens has a concave structure, and the image side of the seventh lens has a convex structure.

[0027] In some alternative implementations, the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are plastic aspherical lenses.

[0028] In some alternative implementations, the panoramic optical lens satisfies the following condition:

[0029] -5.0≤f1 / f≤-4.5;

[0030] -2.8≤f² / f≤-1.9;

[0031] 1.8 ≤ f3 / f ≤ 3.3;

[0032] 1.0 ≤ |f⁴ / f| ≤ 1.9;

[0033] 0.3 ≤ |f⁵ / f| ≤ 1.6;

[0034] 2.3≤f6 / f≤5.5;

[0035] 2.3≤f7 / f≤5.5;

[0036] Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the panoramic optical lens.

[0037] In some alternative implementations, the panoramic optical lens satisfies the following condition:

[0038] 1.80≤Nd1≤1.92;

[0039] 1.51≤Nd2≤1.54;

[0040] 1.93≤Nd3≤2.01;

[0041] 1.51≤Nd4≤1.54;

[0042] 1.61≤Nd5≤1.66;

[0043] 1.51≤Nd6≤1.54;

[0044] 1.61≤Nd7≤1.66;

[0045] Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd5 is the refractive index of the fifth lens, Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens.

[0046] In some alternative implementations, the panoramic optical lens satisfies the following condition:

[0047] 34≤Vd1≤48;

[0048] 23≤Vd2≤57;

[0049] 17.5≤Vd3≤25.5;

[0050] 52≤Vd4≤57;

[0051] 21≤Vd5≤25;

[0052] 52≤Vd6≤57;

[0053] 21≤Vd7≤25;

[0054] Wherein, Vd1 is the dispersion coefficient of the first lens, Vd2 is the dispersion coefficient of the second lens, Vd3 is the dispersion coefficient of the third lens, Vd4 is the dispersion coefficient of the fourth lens, Vd5 is the dispersion coefficient of the fifth lens, Vd6 is the dispersion coefficient of the sixth lens, and Vd7 is the dispersion coefficient of the seventh lens.

[0055] In some alternative implementations, the BFL and f of the panoramic optical lens satisfy the following condition:

[0056] 1.66≤BFL / f≤1.8;

[0057] Wherein, BFL is the back focal length of the panoramic optical lens, and f is the effective focal length of the panoramic optical lens.

[0058] In some alternative implementations, the BFL and TTL of the panoramic optical lens satisfy the following condition:

[0059] 0.13≤BFL / TTL≤0.15;

[0060] Wherein, BFL is the back focal length of the panoramic optical lens; TTL is the distance on the optical axis from the center of the object side of the first lens to the imaging surface of the panoramic optical lens.

[0061] In summary, this utility model has at least the following advantages:

[0062] This utility model provides a large field-of-view, large-aperture automotive panoramic optical lens. Through the arrangement of a first and second lens, and their respective focal lengths, light from a large field of view is converged to the rear lens, improving the field of view to greater than 200°. A third lens, also with its focal length, converges the light collected by the front lens to the rear lens. A fourth and fifth lens, with their respective focal lengths and cemented lenses, help correct aberrations and achieve an aperture value of f / 1.68 or less. Finally, a sixth and fifth lens, also with their respective focal lengths and cemented lenses, help correct chromatic aberration, improving image quality. Furthermore, the cemented lenses reduce assembly sensitivity and increase production yield. The panoramic optical lens of this invention has a maximum field of view exceeding 200° and features high image quality, a large field of view, a large aperture, small size, low cost, and significant ghosting reduction in the image. It can meet the usage requirements in temperatures ranging from -40℃ to 95℃, and its significant ghosting reduction improves the reliability of autonomous driving image acquisition. Furthermore, the panoramic optical lens provided by this invention, when used with a photosensitive chip, significantly enhances its resolution and image processing power. Attached Figure Description

[0063] Figure 1 This is a schematic diagram of the structure of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 1 of this utility model.

[0064] Figure 2 This is a field curvature simulation diagram of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 1 of this utility model.

[0065] Figure 3 This is a distortion simulation diagram of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 1 of this utility model.

[0066] Figure 4 This is a simulation diagram of the vertical axis aberration of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 1 of this utility model.

[0067] Figure 5 A schematic diagram of the MTF curve of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 1 of this utility model.

[0068] Figure 6 This is a schematic diagram of the structure of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 2 of this utility model.

[0069] Figure 7 This is a field curvature simulation diagram of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 2 of this utility model.

[0070] Figure 8 This is a distortion simulation diagram of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided for Embodiment 2 of this utility model.

[0071] Figure 9 This is a simulation diagram of the vertical axis aberration of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 2 of this utility model.

[0072] Figure 10 A schematic diagram of the MTF curve of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 2 of this utility model.

[0073] Figure 11 This is a schematic diagram of the structure of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 3 of this utility model.

[0074] Figure 12 This is a field curvature simulation diagram of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 3 of this utility model.

[0075] Figure 13 This is a distortion simulation diagram of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 3 of this utility model.

[0076] Figure 14 This is a simulation diagram of the vertical axis aberration of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 3 of this utility model.

[0077] Figure 15 A schematic diagram of the MTF curve of a large field-of-view, large aperture vehicle-mounted panoramic optical lens provided in Embodiment 3 of this utility model.

[0078] Marked in the image:

[0079] L1, the first lens;

[0080] L2, the second lens;

[0081] L3, the third lens;

[0082] L4, the fourth lens;

[0083] L5, the fifth lens;

[0084] L6, the sixth lens;

[0085] L7, the seventh lens;

[0086] L8, filter. Detailed Implementation

[0087] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0088] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0089] Example 1

[0090] This utility model embodiment aims to address the shortcomings of existing 360° panoramic lenses, such as poor image quality, narrow field of view, large size, and high cost, which are urgent technical problems to be solved. It provides a large field of view and large aperture vehicle-mounted panoramic optical lens.

[0091] Please see Figure 1 The large field-of-view, large aperture automotive panoramic optical lens provided in this embodiment includes: a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive or negative optical power, a fifth lens L5 with positive or negative optical power, a sixth lens L6 with positive optical power, and a seventh lens L7 with negative optical power, arranged sequentially along the optical axis from the object side to the image side.

[0092] During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 sequentially from the object side S1 of the first lens L1, and finally form an image on the imaging surface of the panoramic optical lens.

[0093] Among them, the fourth lens L4 and the fifth lens L5 form a cemented lens, and the sixth lens L6 and the seventh lens L7 form a cemented lens.

[0094] In this embodiment, the aperture of the panoramic optical lens is designed so that the aperture value of the panoramic optical lens satisfies: FNO≤1.68, thus achieving a large aperture.

[0095] In addition, the maximum field of view of the panoramic optical lens was designed so that the FOV, f, and h of the panoramic optical lens satisfy the following condition:

[0096] 50≤(FOV×f) / h≤54;

[0097] Wherein, FOV is the maximum field of view of the optical lens, h is the image height corresponding to the maximum field of view, and f is the effective focal length of the panoramic optical lens.

[0098] In this embodiment, the first lens L1 and the second lens L2 are designed with negative optical power, so that light from a larger field of view can be more smoothly converged to the rear lens, which is beneficial to improving the field of view and can achieve a field of view greater than 200°. The third lens L3 is designed with positive optical power to converge the light collected by the first lens L1 and the second lens L2 to the rear lens. By setting the fourth lens L4 and the fifth lens L5 as cemented lenses, it is beneficial to correct aberrations and achieve a large aperture value of less than or equal to 1.68. Finally, the sixth lens L6 and the third lens L7, which are also cemented lenses, are used to correct chromatic aberration of the panoramic optical lens and improve the image quality of the panoramic optical lens. At the same time, the cemented lenses help to reduce the assembly sensitivity of the panoramic optical lens and improve the production yield. The panoramic optical lens of this invention has a maximum field of view exceeding 200° and features high image quality, a large field of view, a large aperture, small size, low cost, and significant ghosting reduction in the image. It can meet the usage requirements in temperatures ranging from -40℃ to 95℃, and its significant ghosting reduction improves the reliability of autonomous driving image acquisition. Furthermore, the panoramic optical lens provided by this invention, when used with a photosensitive chip, significantly enhances its resolution and image processing power.

[0099] In this preferred embodiment, the lens shapes of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7 of the panoramic optical lens are designed as follows:

[0100] The first lens L1 has negative optical power, the object side S1 of the first lens L1 has a convex structure, and the image side S2 of the first lens L1 has a concave structure.

[0101] The second lens L2 has negative optical power. The object side S3 of the second lens L2 has a convex structure, and the image side S4 of the second lens L2 has a concave structure.

[0102] The third lens L3 has positive optical power. The object side S5 of the third lens L3 has a convex or concave structure, and the image side S6 of the third lens L3 has a convex structure.

[0103] The fourth lens L4 has positive optical power, and the object side S8 and image side S9 of the fourth lens L4 have a convex structure.

[0104] The fifth lens L5 has negative optical power, and the object side S9 and image side S10 of the fifth lens L5 have a concave structure.

[0105] The sixth lens L6 has positive optical power, and the object side S11 and image side S12 of the sixth lens L6 have a convex structure.

[0106] The seventh lens L7 has negative optical power. The object side S12 of the seventh lens L7 has a concave structure, and the image side S13 of the seventh lens L7 has a convex structure.

[0107] In addition, an aperture stop S7 is provided between the third lens L3 and the fourth lens L4, and a filter L8 is provided on the image side S13 of the seventh lens L7. The filter L8 has an object side S14 and an image side S15. After passing through the filter L8, the light finally forms an image on the imaging surface of the panoramic optical lens.

[0108] Specifically, combining the fourth lens L4 and the fifth lens L5 into a cemented lens, and combining the sixth lens L6 and the seventh lens L7 into a cemented lens, is beneficial for correcting chromatic aberration in panoramic optical lenses, achieving a large aperture, and improving the image quality of panoramic optical lenses. At the same time, cemented lenses help reduce the assembly sensitivity of panoramic optical lenses and improve production yield.

[0109] In addition, as a preferred embodiment, the first lens L1 and the third lens L3 of the panoramic optical lens are glass spherical lenses; the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

[0110] This panoramic optical lens uses five plastic aspherical lenses, which effectively correct aberrations such as spherical aberration, coma, and field curvature, while also helping to reduce costs. In addition, it is equipped with two glass spherical lenses, which helps to correct temperature drift of the panoramic optical lens. This panoramic optical lens structure helps to achieve high image quality, low cost, and a heat-free lens effect.

[0111] In this embodiment, the focal lengths of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7 of the panoramic optical lens are designed to satisfy the following condition:

[0112] -5.0≤f1 / f≤-4.5;

[0113] -2.8≤f² / f≤-1.9;

[0114] 1.8 ≤ f3 / f ≤ 3.3;

[0115] 1.0 ≤ |f⁴ / f| ≤ 1.9;

[0116] 0.3 ≤ |f⁵ / f| ≤ 1.6;

[0117] 2.3≤f6 / f≤5.5;

[0118] 2.3≤f7 / f≤5.5;

[0119] Wherein, f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the first lens L2, f3 is the effective focal length of the first lens L3, f4 is the effective focal length of the fourth lens L4, f5 is the effective focal length of the fifth lens L5, f6 is the effective focal length of the sixth lens L6, f7 is the effective focal length of the seventh lens L7, and f is the effective focal length of the panoramic optical lens; the fourth lens L4 and the fifth lens L5 form a cemented lens, and the sixth lens L6 and the seventh lens L7 form a cemented lens.

[0120] In addition, the first lens L1 has a large negative optical power, which is beneficial for collecting light at a wider angle and also helps to reduce the size of the panoramic optical lens head, thus facilitating the miniaturization of the panoramic optical lens. The second lens L2 has a negative optical power, which, together with the first lens L1, helps light to enter the rear lens group more smoothly.

[0121] In this embodiment, by controlling the focal length and shape of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7, the lens is made to have a field of view greater than 200° and a large aperture value less than or equal to 1.68. At the same time, it has a significant effect on eliminating ghosting, making the image clearer and cleaner. It also eliminates some stray light from the design and has the characteristics of high image quality, small size, and low cost, which is conducive to the promotion of autonomous driving.

[0122] Furthermore, in this embodiment, the shape design of the first lens L1 and the second lens L2, in conjunction with their focal lengths, converges light rays with a large field of view to the rear group system, which is beneficial to improving the field of view and can achieve a field of view greater than 200°. The shape design of the third lens L3, the fourth lens L4, and the fifth lens L5, in conjunction with their focal lengths, is beneficial to correcting aberrations in panoramic optical lenses, improving image quality, and achieving a large aperture value of less than or equal to 1.68. Combining the fourth lens L4 and the fifth lens L5 into a cemented lens, and the sixth lens L6 and the seventh lens L7 into a cemented lens, the two sets of cemented lenses facilitate the reduction of tolerance sensitivity of the panoramic optical lens and are beneficial to improving the processing and assembly yield.

[0123] In some optional embodiments, the refractive indices of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L6 of the panoramic optical lens are also designed to satisfy the following condition:

[0124] 1.80≤Nd1≤1.92;

[0125] 1.51≤Nd2≤1.54;

[0126] 1.93≤Nd3≤2.01;

[0127] 1.51≤Nd4≤1.54;

[0128] 1.61≤Nd5≤1.66;

[0129] 1.51≤Nd6≤1.54;

[0130] 1.61≤Nd7≤1.66;

[0131] Wherein, Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L2, Nd3 is the refractive index of the third lens L3, Nd4 is the refractive index of the fourth lens L4, Nd5 is the refractive index of the fifth lens L5, Nd6 is the refractive index of the sixth lens L6, and Nd7 is the refractive index of the seventh lens L7.

[0132] In the above parameter design, the structural design of the first lens L1 and the second lens L1, by matching the refractive index of the lenses, is conducive to reducing the head size of the panoramic optical lens and achieving the purpose of miniaturization; the selection of the refractive index of the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and / or the seventh lens L7 is conducive to correcting the spherical aberration of the panoramic optical lens and making the image clearer.

[0133] In some optional embodiments, the dispersion coefficients of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7 of the panoramic optical lens are also designed to satisfy the following condition:

[0134] 34≤Vd1≤48;

[0135] 23≤Vd2≤57;

[0136] 17.5≤Vd3≤25.5;

[0137] 52≤Vd4≤57;

[0138] 21≤Vd5≤25;

[0139] 52≤Vd6≤57;

[0140] 21≤Vd7≤25;

[0141] Wherein, Vd1 is the dispersion coefficient of the first lens L1, Vd2 is the dispersion coefficient of the second lens L2, Vd3 is the dispersion coefficient of the third lens L3, Vd4 is the dispersion coefficient of the fourth lens L4, Vd5 is the dispersion coefficient of the fifth lens L5, Vd6 is the dispersion coefficient of the sixth lens L6, and Vd7 is the dispersion coefficient of the seventh lens L7.

[0142] In the above parameter design, the structural design of the third lens L3, the fourth lens L4, and the fifth lens L5, by matching the lens dispersion coefficient, is beneficial to correcting chromatic aberration in panoramic optical lenses, making the image clearer.

[0143] In some optional embodiments, the following parameters of the panoramic optical lens are also designed:

[0144] The BFL and f of a panoramic optical lens shall satisfy the following condition:

[0145] 1.66≤BFL / f≤1.8;

[0146] The BFL and TTL of the panoramic optical lens should satisfy the following condition:

[0147] 0.13≤BFL / TTL≤0.15;

[0148] Wherein, BFL is the back focal length of the panoramic optical lens; TTL is the distance on the optical axis from the center of the object side of the first lens L1 to the imaging surface of the panoramic optical lens.

[0149] This utility model provides a large field-of-view, large-aperture automotive panoramic optical lens, which significantly eliminates ghosting in the image, improving the reliability of autonomous driving image acquisition. The panoramic optical lens combines two glass spherical lenses with five plastic aspherical lenses, offering good manufacturability, low cost, a field of view >200°, an aperture value ≤1.68, and a small size, facilitating module miniaturization.

[0150] In this embodiment, based on the above design of the shape and related parameters of the panoramic optical lens, the parameters of the panoramic optical lens are designed as follows:

[0151] Table 1: The focal length design of the panoramic optical lens protected by Example 1 is shown in the table below:

[0152]

[0153] The first lens L1 has a large negative optical power, which is beneficial for collecting light from a wider angle and for reducing the size of the panoramic optical lens head, thus facilitating the miniaturization of the panoramic optical lens. The second lens L2 has a negative optical power, which, together with the first lens L1, helps light to enter the rear lens group more smoothly. The third lens L3 has a positive optical power, which helps to converge the light collected by the first lens L1 and the second lens L2 to the rear lens group. The fourth lens L4 has a positive optical power, and the fifth lens L5 has a negative optical power. The fourth lens L4 and the fifth lens L5 are cemented lenses, which helps to correct aberrations and achieve a large aperture value of less than or equal to 1.68. Finally, the sixth lens L6, which is cemented and has a positive optical power, and the third lens L7, which has a negative optical power, help to correct chromatic aberration in the panoramic optical lens, improve the image quality of the panoramic optical lens, and the cemented lenses help to reduce the assembly sensitivity of the panoramic optical lens and improve the production yield.

[0154] Table 2: One design value for the panoramic optical lens protected in Example 1:

[0155]

[0156] In Table 2 above, the surface numbers are assigned according to the surface order of each lens. "S1" represents the object side of the first lens L1, "S2" represents the image side of the first lens L1, and so on. The radius of curvature represents the curvature of the lens surface. A positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. "PL" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the central axial distance between the current surface and the next surface. The refractive index represents the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air and the refractive index is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface. A blank space indicates that the current position is air. The k value represents the value of the best-fit conic coefficient of the aspherical surface.

[0157] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0158]

[0159] Where z is the axial sagitta in the Z direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k is the coefficient of the fitted cone; and AG are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspherical polynomial.

[0160] Table 3: A design value for the aspherical coefficient in the panoramic optical lens protected in Example 1:

[0161]

[0162] Table 4: Other optical information of the panoramic optical lens protected in Example 1:

[0163]

[0164] In Table 4, D represents the effective optical aperture of the first lens L1.

[0165] In this embodiment, based on the shape design of the panoramic optical lens, combined with the above-mentioned parameter design, and in conjunction with... Figure 2 and Figure 3 As shown in the simulation diagram of the field curvature and distortion of the panoramic optical lens, it can be seen that in Figure 2 In the coordinate system, the horizontal coordinate represents the field curvature of the wide field-of-view panoramic lens, in mm; the vertical coordinate represents the normalized image height, with 0 indicating the image is on the optical axis; Figure 3 In the coordinate system, the horizontal coordinate represents the magnitude of the distortion (F-θ), expressed as %; the vertical coordinate represents the normalized image height. Figure 2 and Figure 3 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the large field-of-view panoramic optical lens is effectively controlled. At the same time, the distortion (F-θ) curves of each wavelength coincide, indicating that the distortion of the large field-of-view panoramic optical lens at each wavelength is well controlled, and the image height and field of view have a good linear relationship.

[0166] Combination Figure 4 As shown in the simulation diagram of the transverse aberration of the panoramic optical lens, in Figure 4 In the diagram, the vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the diagram represent different wavelengths of the panoramic optical lens image, derived from... Figure 4 It can be seen that the transverse aberration of different wavelengths is controlled within the range of ±0.1mm, indicating that the spherical aberration of the panoramic optical lens is well controlled at each wavelength.

[0167] Combination Figure 5 As shown in the schematic diagram of the MTF curve of the panoramic optical lens, in Figure 5 In this context, MTF represents the overall image quality of a panoramic optical lens. A higher MTF value indicates a clearer image. Figure 5 As 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 5 It can be seen that the panoramic optical lens has excellent image quality within the field of view.

[0168] Example 2

[0169] This embodiment discloses a large field-of-view, large aperture vehicle panoramic optical lens, which optimizes the shape of the fourth lens L4 and the fifth lens L5 based on the lens shape design of the panoramic optical lens in embodiment 1.

[0170] In this embodiment, as Figure 6 As shown, the lens shapes of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7 of this panoramic optical lens are designed as follows:

[0171] The first lens L1 has negative optical power, the object side S1 of the first lens L1 has a convex structure, and the image side S2 of the first lens L1 has a concave structure.

[0172] The second lens L2 has negative optical power. The object side S3 of the second lens L2 has a convex structure, and the image side S4 of the second lens L2 has a concave structure.

[0173] The third lens L3 has positive optical power. The object side S5 of the third lens L3 has a convex or concave structure, and the image side S6 of the third lens L3 has a convex structure.

[0174] The fourth lens L4 has negative optical power, and the object side S8 and image side S9 of the fourth lens L4 have a concave structure.

[0175] The fifth lens L5 has positive optical power, and the object side S9 and image side S10 of the fifth lens L5 have a convex structure.

[0176] The sixth lens L6 has positive optical power, and the object side S11 and image side S12 of the sixth lens L6 have a convex structure.

[0177] The seventh lens L7 has negative optical power. The object side S12 of the seventh lens L7 has a concave structure, and the image side S13 of the seventh lens L7 has a convex structure.

[0178] In addition, an aperture stop S7 is provided between the third lens L3 and the fourth lens L4, and a filter L8 is provided on the image side S13 of the seventh lens L7. The filter L8 has an object side S14 and an image side S15. After passing through the filter L8, the light finally forms an image on the imaging surface of the panoramic optical lens.

[0179] Specifically, combining the fourth lens L4 and the fifth lens L5 into a cemented lens, and combining the sixth lens L6 and the seventh lens L7 into a cemented lens, is beneficial for correcting chromatic aberration in panoramic optical lenses, achieving a large aperture, and improving the image quality of panoramic optical lenses. At the same time, cemented lenses help reduce the assembly sensitivity of panoramic optical lenses and improve production yield.

[0180] In addition, as a preferred embodiment, the first lens L1 and the third lens L3 of the panoramic optical lens are glass spherical lenses; the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

[0181] This panoramic optical lens uses five plastic aspherical lenses, which effectively correct aberrations such as spherical aberration, coma, and field curvature, while also helping to reduce costs. In addition, it is equipped with two glass spherical lenses, which helps to correct temperature drift of the panoramic optical lens. This panoramic optical lens structure helps to achieve high image quality, low cost, and a heat-free lens effect.

[0182] In this embodiment, based on the above-described shape design of the panoramic optical lens, the relevant parameters of the panoramic optical lens are designed as follows:

[0183] Table 5: The focal length design of the panoramic optical lens protected in Example 2 is shown in the table below:

[0184]

[0185] Table 6: One design value for the panoramic optical lens protected in Example 2:

[0186]

[0187] In Table 6 above, the surface numbers are assigned according to the surface order of each lens. "S1" represents the object side of the first lens L1, "S2" represents the image side of the first lens L1, and so on. The radius of curvature represents the curvature of the lens surface. A positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. "PL" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the central axial distance between the current surface and the next surface. The refractive index represents the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air and the refractive index is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface. A blank space indicates that the current position is air. The k value represents the value of the best-fit conic coefficient of the aspherical surface.

[0188] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0189]

[0190] Where z is the axial sagitta in the Z direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k is the coefficient of the fitted cone; and AG are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspherical polynomial.

[0191] Table 7: A design value for the aspherical coefficient in the panoramic optical lens protected in Example 2:

[0192]

[0193] Table 8: Other optical information of the panoramic optical lens protected in Example 2:

[0194]

[0195] In Table 8, D represents the effective optical aperture of the first lens L1.

[0196] In this embodiment, based on the shape design of the panoramic optical lens, combined with the above-mentioned parameter design, and in conjunction with... Figure 7 and Figure 8 As shown in the simulation diagram of the field curvature and distortion of the panoramic optical lens, it can be seen that in Figure 7 In the coordinate system, the horizontal coordinate represents the field curvature of the wide field-of-view panoramic lens, in mm; the vertical coordinate represents the normalized image height, with 0 indicating the image is on the optical axis; Figure 8 In the coordinate system, the horizontal coordinate represents the magnitude of the distortion (F-θ), expressed as %; the vertical coordinate represents the normalized image height. Figure 7 and Figure 8 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the large field-of-view panoramic optical lens is effectively controlled. At the same time, the distortion (F-θ) curves of each wavelength coincide, indicating that the distortion of the large field-of-view panoramic optical lens at each wavelength is well controlled, and the image height and field of view have a good linear relationship.

[0197] Combination Figure 9 As shown in the simulation diagram of the transverse aberration of the panoramic optical lens, in Figure 9 In the diagram, the vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the diagram represent different wavelengths of the panoramic optical lens image, derived from... Figure 9 It can be seen that the transverse aberration of different wavelengths is controlled within the range of ±0.1mm, indicating that the spherical aberration of the panoramic optical lens is well controlled at each wavelength.

[0198] Combination Figure 10 As shown in the schematic diagram of the MTF curve of the panoramic optical lens, in Figure 10In this context, MTF represents the overall image quality of a panoramic optical lens. A higher MTF value indicates a clearer image. Figure 10 As 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 It can be seen that the panoramic optical lens has excellent image quality within the field of view.

[0199] Example 3

[0200] This embodiment discloses a panoramic optical lens, such as Figure 11 As shown, based on the lens shape design of the panoramic optical lens in Embodiment 2, the relevant parameters of the panoramic optical lens are optimized. The parameter design of the panoramic optical lens is as follows:

[0201] Table 9: The focal length design of the panoramic optical lens protected by Example 3 is shown in the table below:

[0202]

[0203] Table 10: One design value for the panoramic optical lens protected in Example 3:

[0204]

[0205] In Table 10 above, the surface numbers are assigned according to the surface order of each lens. "S1" represents the object side of the first lens L1, "S2" represents the image side of the first lens L1, and so on. The radius of curvature represents the curvature of the lens surface. A positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. "PL" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the central axial distance between the current surface and the next surface. The refractive index represents the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air and the refractive index is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface. A blank space indicates that the current position is air. The k value represents the magnitude of the best-fit conic coefficient of the aspherical surface.

[0206] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0207]

[0208] Where z is the axial sagitta in the Z direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k is the coefficient of the fitted cone; and AG are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspherical polynomial.

[0209] Table 11: A design value for the aspherical coefficient in the panoramic optical lens protected in Example 3:

[0210]

[0211] Table 12: Other optical information of the panoramic optical lens protected in Example 3:

[0212]

[0213] In Table 12, D represents the effective optical aperture of the first lens L1.

[0214] In this embodiment, based on the shape design of the panoramic optical lens, combined with the above-mentioned parameter design, and in conjunction with... Figure 12 and Figure 13 As shown in the simulation diagram of the field curvature and distortion of the panoramic optical lens, it can be seen that in Figure 12 In the coordinate system, the horizontal coordinate represents the field curvature of the wide field-of-view panoramic lens, in mm; the vertical coordinate represents the normalized image height, with 0 indicating the image is on the optical axis; Figure 13 In the coordinate system, the horizontal coordinate represents the magnitude of the distortion (F-θ), expressed as %; the vertical coordinate represents the normalized image height. Figure 12 and Figure 13 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the large field-of-view panoramic optical lens is effectively controlled. At the same time, the distortion (F-θ) curves of each wavelength coincide, indicating that the distortion of the large field-of-view panoramic optical lens at each wavelength is well controlled, and the image height and field of view have a good linear relationship.

[0215] Combination Figure 14 As shown in the simulation diagram of the transverse aberration of the panoramic optical lens, in Figure 14 In the diagram, the vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the diagram represent different wavelengths of the panoramic optical lens image, derived from... Figure 14 It can be seen that the transverse aberration of different wavelengths is controlled within the range of ±0.1mm, indicating that the spherical aberration of the panoramic optical lens is well controlled at each wavelength.

[0216] Combination Figure 15 As shown in the schematic diagram of the MTF curve of the panoramic optical lens, in Figure 15In this context, MTF represents the overall image quality of a panoramic optical lens. A higher MTF value indicates a clearer image. Figure 15 As 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 It can be seen that the panoramic optical lens has excellent image quality within the field of view.

[0217] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0218] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0219] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0220] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A large field-of-view, large aperture automotive panoramic optical lens, characterized in that, include: Along the optical axis from the object side to the image side, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with either positive or negative optical power, a fifth lens with either positive or negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power are arranged sequentially. Wherein, the fourth lens and the fifth lens form a cemented lens; the sixth lens and the seventh lens form a cemented lens; The aperture value of the panoramic optical lens satisfies: FNO≤1.

68.

2. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The FOV, f, and h of the panoramic optical lens satisfy the following condition: 50≤(FOV×f) / h≤54; Wherein, FOV is the maximum field of view of the optical lens, h is the image height corresponding to the maximum field of view, and f is the effective focal length of the panoramic optical lens.

3. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The object side of the first lens has a convex structure, and the image side of the first lens has a concave structure. The object side of the second lens has a convex structure, and the image side of the second lens has a concave structure. The object side of the third lens has a convex or concave structure, and the image side of the third lens has a convex structure. The fourth lens has positive optical power, and the object side and image side of the fourth lens have a convex structure. The fifth lens has negative optical power, and the object side and image side of the fifth lens have a concave structure; The object-side and image-side surfaces of the sixth lens are convex. The object side of the seventh lens has a concave structure, and the image side of the seventh lens has a convex structure.

4. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The object side of the first lens has a convex structure, and the image side of the first lens has a concave structure. The object side of the second lens has a convex structure, and the image side of the second lens has a concave structure. The object side of the third lens has a convex or concave structure, and the image side of the third lens has a convex structure. The fourth lens has negative optical power, and the object side and image side of the fourth lens have a concave structure. The fifth lens has negative positive power, and the object side and image side of the fifth lens have a convex structure; The object-side and image-side surfaces of the sixth lens are convex. The object side of the seventh lens has a concave structure, and the image side of the seventh lens has a convex structure.

5. The large field-of-view, large aperture automotive panoramic optical lens according to claim 3 or 4, characterized in that, The first lens and the third lens are glass spherical lenses, while the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are plastic aspherical lenses.

6. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The panoramic optical lens satisfies the following condition: -5.0≤f1 / f≤-4.5; -2.8≤f² / f≤-1.9; 1.8 ≤ f3 / f ≤ 3.3; 1.0 ≤ |f⁴ / f| ≤ 1.9; 0.3 ≤ |f⁵ / f| ≤ 1.6; 2.3≤f6 / f≤5.5; 2.3≤f7 / f≤5.5; Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the panoramic optical lens.

7. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The panoramic optical lens satisfies the following condition: 1.80≤Nd1≤1.92; 1.51≤Nd2≤1.54; 1.93≤Nd3≤2.01; 1.51≤Nd4≤1.54; 1.61≤Nd5≤1.66; 1.51≤Nd6≤1.54; 1.61≤Nd7≤1.66; Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd5 is the refractive index of the fifth lens, Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens.

8. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The panoramic optical lens satisfies the following condition: 34≤Vd1≤48; 23≤Vd2≤57; 17.5≤Vd3≤25.5; 52≤Vd4≤57; 21≤Vd5≤25; 52≤Vd6≤57; 21≤Vd7≤25; Wherein, Vd1 is the dispersion coefficient of the first lens, Vd2 is the dispersion coefficient of the second lens, Vd3 is the dispersion coefficient of the third lens, Vd4 is the dispersion coefficient of the fourth lens, Vd5 is the dispersion coefficient of the fifth lens, Vd6 is the dispersion coefficient of the sixth lens, and Vd7 is the dispersion coefficient of the seventh lens.

9. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The BFL and f of the panoramic optical lens satisfy the following condition: 1.66≤BFL / f≤1.8; Wherein, BFL is the back focal length of the panoramic optical lens, and f is the effective focal length of the panoramic optical lens.

10. The large field-of-view, large aperture automotive panoramic optical lens according to claim 1, characterized in that, The BFL and TTL of the panoramic optical lens satisfy the following condition: 0.13≤BFL / TTL≤0.15; Wherein, BFL is the back focal length of the panoramic optical lens; TTL is the distance on the optical axis from the center of the object side of the first lens to the imaging surface of the panoramic optical lens.

Images