Vehicle-mounted ADAS optical lens

Abstract

The utility model relates to the technical field of optical lenses, and discloses a vehicle-mounted ADAS optical lens. Comprising a first lens with positive focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power or negative focal power, a fifth lens with positive focal power and a sixth lens with positive focal power which are sequentially arranged from an object side to an image side along an optical axis, the seventh lens has negative focal power; the eighth lens has positive focal power; wherein the second lens and the third lens form a balsaming lens; the fourth lens and the fifth lens form a balsaming lens. According to the vehicle-mounted ADAS optical lens provided by the utility model, the structure and optical parameters of the optical lens are optimally designed, so that the vehicle-mounted ADAS optical lens has the characteristics of large aperture, high image quality, small size, weak ghost image, low cost and the like, and meanwhile, the functions of high light transmission, high resolution and the like are realized.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, specifically to an automotive ADAS optical lens. Background Technology

[0002] ADAS is an abbreviation for Advanced Driver-Assistance Systems. It is a series of systems that use various sensors installed on the car (such as cameras, millimeter-wave radar, lidar, etc.) to perceive the surrounding environment and collect data while the car is in motion. Then, advanced algorithms are used to analyze and process this data to provide driving assistance to the driver.

[0003] Advanced driver assistance systems (ADAS) rely on the collaborative work of onboard cameras and chips. As chip technology advances, its processing power increases, enabling it to handle more complex image data. However, this places higher demands on the resolution capabilities of onboard cameras. For example, high-precision map creation and real-time traffic analysis require cameras to capture clear and detailed images so that the chip can perform accurate analysis and judgment.

[0004] High resolution means that automotive cameras can distinguish finer objects and details. In real-world driving scenarios, this is crucial for recognizing distant traffic signs, small obstacles on the road, and more. If the resolution of the automotive camera is insufficient, the image information received by the chip will be blurry, which will affect the accuracy of the judgment of advanced driver assistance systems and may even lead to safety accidents.

[0005] For example, in low-light environments such as rainy days, the vehicle-mounted camera must have strong light-gathering capabilities to ensure it can clearly capture the external scene. This is because if the vehicle-mounted camera does not allow enough light in insufficient light, the captured image will be dark, making it difficult to distinguish vehicles, pedestrians, and other targets on the road.

[0006] For example, when an advanced driver assistance system (ADAS) relies on onboard cameras to determine whether there are obstacles on the road ahead, if the camera produces a ghost image, the ADAS may mistakenly identify the ghost image as a real obstacle, thus making incorrect driving decisions, such as unnecessary braking or swerving, which could endanger driving safety. Utility Model Content

[0007] To address the problems of insufficient resolution in existing automotive lenses, which leads to blurred image information received by the chip and affects the accuracy of judgments by advanced driver assistance systems, this invention provides an automotive ADAS optical lens.

[0008] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0009] In a first aspect, this utility model provides an automotive ADAS optical lens, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side;

[0010] The first lens has positive optical power, the object side of the first lens has a convex structure, and the image side of the first lens has a concave structure.

[0011] The second lens has positive optical power, the object side of the second lens has a convex structure, and the image side of the second lens has a concave structure;

[0012] The third lens has negative optical power, the object side of the third lens has a convex structure, and the image side of the third lens has a concave structure.

[0013] The fourth lens has a positive or negative optical power, and the object side and image side of the fourth lens have a concave structure.

[0014] The fifth lens has positive optical power, and the object side and image side of the fifth lens have a convex structure;

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

[0016] The seventh lens has negative optical power, the object side of the seventh lens has a convex structure, and the image side of the seventh lens has a concave structure.

[0017] The eighth lens has positive optical power, the object side of the eighth lens has a convex structure, and the image side of the eighth lens has a concave structure.

[0018] The second lens and the third lens together form a cemented lens; the fourth lens and the fifth lens together form a cemented lens.

[0019] In some alternative implementations, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all glass spherical lenses.

[0020] In some alternative implementations, the seventh lens and the eighth lens constitute a cemented lens.

[0021] In some alternative implementations, the optical lens satisfies the following condition:

[0022] 1.3≤f1 / f≤1.6;

[0023] 1.1 ≤ f² / f ≤ 1.4;

[0024] -0.65≤f3 / f≤-0.45;

[0025] -0.55≤|f4 / f|≤-0.25;

[0026] 0.35≤|f5 / f|≤6;

[0027] 0.75≤f6 / f≤1.2;

[0028] -2.3≤f7 / f≤-1.3;

[0029] 0.85≤f8 / f≤1.5;

[0030] 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, f8 is the effective focal length of the eighth lens, and f is the effective focal length of the optical lens.

[0031] In some alternative implementations, the optical lens satisfies the following condition:

[0032] 1.9≤Nd1≤2.05;

[0033] 1.45≤Nd2≤1.64;

[0034] 1.7≤Nd3≤1.95;

[0035] 1.65≤Nd4≤1.8;

[0036] 1.7≤Nd5≤1.8;

[0037] 1.85≤Nd6≤2.05;

[0038] 1.7≤Nd7≤2.06;

[0039] 1.4≤Nd8≤1.9;

[0040] 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, Nd7 is the refractive index of the seventh lens, and Nd8 is the refractive index of the eighth lens.

[0041] In some alternative implementations, the optical lens satisfies the following condition:

[0042] 23≤Vd1≤35;

[0043] 70≤Vd2≤95;

[0044] 25≤Vd3≤35;

[0045] 25≤Vd4≤55;

[0046] 21≤Vd5≤55;

[0047] 20≤Vd6≤40;

[0048] 23≤Vd7≤30;

[0049] 40≤Vd8≤96;

[0050] 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, Nd7 is the refractive index of the seventh lens, and Nd8 is the refractive index of the eighth lens.

[0051] In some alternative implementations, the FOV, f, and h of the optical lens satisfy the following condition:

[0052] 55≤(FOV×f) / h≤60;

[0053] 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 optical lens.

[0054] In some alternative implementations, the BFL and f of the optical lens satisfy the following condition:

[0055] 0.25≤BFL / f≤0.3;

[0056] Wherein, BFL is the back focal length of the optical lens, and f is the effective focal length of the optical lens.

[0057] In some alternative implementations, the BFL and TTL of the optical lens satisfy the following condition:

[0058] 0.13≤BFL / TTL≤0.16;

[0059] Wherein, BFL is the back focal length of the 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 optical lens.

[0060] In some alternative implementations, a filter is also included, which is disposed on the outer side of the image side of the eighth lens.

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

[0062] This utility model provides an automotive ADAS optical lens. A first lens, with its focal length, converges light from a wide field of view to the rear lens group, resulting in a smoother light transition and improved field of view, enabling a miniaturized design. Second and third lenses, forming a cemented lens, disperse light from various fields of view, increasing the aperture and light intake. This improves image illumination and chromatic aberration correction, while also reducing lens sensitivity. Fourth and fifth lenses, also forming a cemented lens, with their focal length, create a symmetrical double-Gaussian structure, facilitating high light transmission and further correcting chromatic aberration, coma, and distortion. A sixth lens, with its focal length and structural design, corrects spherical aberration, achieving high resolution. Finally, seventh and eighth lenses, with their focal lengths, correct coma, field curvature, and astigmatism.

[0063] The vehicle-mounted ADAS optical lens of this utility model, through its structural design, has multiple characteristics such as large aperture, high image quality, small size, weak ghosting, and low cost, while also achieving functions such as high light transmission and high resolution. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the structure of an automotive ADAS optical lens provided in Embodiment 1 of this utility model.

[0065] Figure 2 This is a simulation diagram of field curvature and distortion of an automotive ADAS optical lens provided in Embodiment 1 of this utility model.

[0066] Figure 3 This is a simulation diagram of the vertical axis aberration of an automotive ADAS optical lens provided in Embodiment 1 of this utility model.

[0067] Figure 4 This is a schematic diagram of the MTF curve of an automotive ADAS optical lens provided in Embodiment 1 of this utility model.

[0068] Figure 5 This is a schematic diagram of the structure of an automotive ADAS optical lens provided in Embodiment 2 of this utility model.

[0069] Figure 6This is a simulation diagram of field curvature and distortion of an automotive ADAS optical lens provided in Embodiment 2 of this utility model.

[0070] Figure 7 This is a simulation diagram of the vertical axis aberration of an automotive ADAS optical lens provided in Embodiment 2 of this utility model.

[0071] Figure 8 This is a schematic diagram of the MTF curve of an automotive ADAS optical lens provided in Embodiment 2 of this utility model.

[0072] Marked in the image:

[0073] L1, the first lens;

[0074] L2, the second lens;

[0075] L3, the third lens;

[0076] L4, the fourth lens;

[0077] L5, the fifth lens;

[0078] L6, the sixth lens;

[0079] L7, the seventh lens;

[0080] L8, the eighth lens;

[0081] L9, Filter. Detailed Implementation

[0082] 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.

[0083] 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.

[0084] Example 1

[0085] To address the problems of insufficient resolution in existing automotive lenses, which leads to blurred image information received by the chip and affects the accuracy of judgment in the driver assistance system, this invention provides an automotive ADAS optical lens.

[0086] Please see Figure 1 The vehicle-mounted ADAS optical lens provided in this embodiment includes: a first lens L1 with positive optical power, a second lens L2 with positive optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive or negative optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, and an eighth lens L8 with positive optical power, arranged sequentially along the optical axis from the object side to the image side.

[0087] This embodiment is a preferred embodiment, in which the shape of the optical lens has been optimized.

[0088] In this embodiment, based on the design of the focal length of the optical lens described above, the lens shapes of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8 of the optical lens are designed as follows:

[0089] The object side surface S1 of the first lens L1 has a convex structure, and the image side surface S2 of the first lens L1 has a concave structure.

[0090] The object side surface S3 of the second lens L2 has a convex structure, and the image side surface S4 of the second lens L2 has a concave structure.

[0091] The object side surface S4 of the third lens L3 has a convex structure, and the image side surface S5 of the third lens L3 has a concave structure.

[0092] The object-side surface S7 and image-side surface S8 of the fourth lens L4 have a concave structure;

[0093] The object-side surface S8 and image-side surface S9 of the fifth lens L5 have a convex structure;

[0094] The object-side surface S10 and image-side surface S11 of the sixth lens L6 have a convex structure;

[0095] The object-side surface S12 of the seventh lens L7 has a convex structure, and the image-side surface S13 of the seventh lens L7 has a concave structure.

[0096] The object-side surface S14 of the eighth lens L8 has a convex structure, and the image-side surface S15 of the eighth lens L8 has a concave structure.

[0097] In addition, an aperture S6 is provided between the third lens L3 and the fourth lens L4, and a filter L9 is provided on the side of the image side S15 of the eighth lens L8. The filter L9 has an object side S16 and an image side S17. After passing through the filter L9, the light finally forms an image on the imaging surface of the optical lens.

[0098] The second lens L2 and the third lens L3 form a cemented lens; the fourth lens L4 and the fifth lens L5 form a cemented lens.

[0099] During imaging, light rays enter sequentially from the object side S1 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, the seventh lens L7, and the eighth lens L8, and finally form an image on the imaging surface of the optical lens.

[0100] The automotive ADAS optical lens provided in this embodiment, by setting the first lens L1 to positive optical power, converges light from a large field of view to the rear lens group, resulting in a smooth light transition. This facilitates control over the aperture of the rear lens group and enables a miniaturized design. By setting the second lens L2 to positive optical power, light convergence is achieved, while the third lens L3 is set to negative optical power, light divergence is achieved. This further disperses light from different fields of view. At the same field of view, the light emitted from the image side S1 of the first lens L1 allows the rear lens group to have a larger light-receiving surface, thus enlarging the physical aperture of the aperture stop S6 and achieving greater light intake, which is beneficial for increasing image illumination. Simultaneously, the second lens L2 and the third lens L3 are combined into a cemented lens, which is beneficial for overall... The correction of chromatic aberration in the optical lens is beneficial to reducing the sensitivity tolerance of the optical lens; by setting the fourth lens L4 to positive or negative optical power, and the fifth lens L5 to positive optical power, and forming a cemented lens with the fourth lens L4 and the fifth lens L5, forming a symmetrical double Gaussian structure with the second lens L2 and the third lens L3 forming the cemented lens, it is beneficial to achieve high light transmission, and further beneficial to correct chromatic aberration, coma, distortion and other aberrations in the optical lens; by setting the sixth lens L6 to positive optical power, in combination with its structural design, it is beneficial to correct the spherical aberration of the overall optical lens and achieve high resolution; by setting the seventh lens L7 to negative optical power and the eighth lens L8 to positive optical power, it is beneficial to correct the coma, field curvature and astigmatism of the overall optical lens.

[0101] The vehicle-mounted ADAS optical lens provided in this embodiment has multiple characteristics such as large aperture, high image quality, small size, weak ghosting, and low cost through optimized design of its parameters and structure.

[0102] This embodiment, as a preferred embodiment, specifies the materials 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, the seventh lens L7, and the eighth lens L8.

[0103] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all glass spherical lenses, which helps to reduce the cost of the vehicle-mounted ADAS optical lens.

[0104] 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, seventh lens L7, and eighth lens L8 of the optical lens are designed to satisfy the following condition:

[0105] 1.3≤f1 / f≤1.6;

[0106] 1.1 ≤ f² / f ≤ 1.4;

[0107] -0.65≤f3 / f≤-0.45;

[0108] -0.55≤|f4 / f|≤-0.25;

[0109] 0.35≤|f5 / f|≤6;

[0110] 0.75≤f6 / f≤1.2;

[0111] -2.3≤f7 / f≤-1.3;

[0112] 0.85≤f8 / f≤1.5;

[0113] Where f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, f3 is the effective focal length of the third 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, f8 is the effective focal length of the eighth lens L8, and f is the effective focal length of the optical lens.

[0114] 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, seventh lens L7, and eighth lens L8 of the optical lens are also designed to satisfy the following condition:

[0115] 1.9≤Nd1≤2.05;

[0116] 1.45≤Nd2≤1.64;

[0117] 1.7≤Nd3≤1.95;

[0118] 1.65≤Nd4≤1.8;

[0119] 1.7≤Nd5≤1.8;

[0120] 1.85≤Nd6≤2.05;

[0121] 1.7≤Nd7≤2.06;

[0122] 1.4≤Nd8≤1.9;

[0123] 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, Nd7 is the refractive index of the seventh lens L7, and Nd8 is the refractive index of the eighth lens L8.

[0124] 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, seventh lens L7, and eighth lens L8 of the optical lens are also designed to satisfy the following condition:

[0125] 23≤Vd1≤35;

[0126] 70≤Vd2≤95;

[0127] 25≤Vd3≤35;

[0128] 25≤Vd4≤55;

[0129] 21≤Vd5≤55;

[0130] 20≤Vd6≤40;

[0131] 23≤Vd7≤30;

[0132] 40≤Vd8≤96;

[0133] 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, Nd7 is the refractive index of the seventh lens L7, and Nd8 is the refractive index of the eighth lens L8.

[0134] In this embodiment, given that the first lens L1 has positive optical power, based on the shape and parameters of the first lens L1, the object-side surface S1 of the first lens L1 is designed as a convex structure, which has the function of converging light rays and can prevent excessive divergence of object-side light rays, so as to collect as much light as possible into the rear lens group. At the same time, designing the object-side surface S1 of the first lens L1 as a convex structure is conducive to water droplets sliding off in rainy application scenarios, reducing the impact of water droplets on image quality. The image-side surface S2 of the first lens L1 is designed as a concave structure, which can collect as much wide-field light rays as possible into the rear lens group, while making the light path transition smoothly, which is conducive to controlling the aperture of the rear lens group and realizing a miniaturized design. In addition, the first lens L1 is a glass spherical lens, using a high refractive index material, which is conducive to reducing the front aperture and realizing a miniaturized design.

[0135] Given that the second lens L2 has positive optical power, its shape and parameters are designed to converge light rays. The third lens L3 has negative optical power, and its shape and parameters are designed to diverge light rays. This further disperses light rays from each field of view. At the same field of view, the light rays emitted from the image side S1 of the first lens L1 can provide a larger light receiving surface for the rear lens group, thereby increasing the physical aperture of the aperture stop S6 and achieving a greater amount of light intake, which is beneficial for increasing the image illumination. At the same time, combining the second lens L2 and the third lens L3 into a cemented lens is beneficial for correcting chromatic aberration of the entire optical lens and for reducing the sensitivity tolerance of the optical lens.

[0136] The fourth lens L4 has either positive or negative optical power. The design is based on the shape and parameters of the fourth lens L4. The fifth lens L5 has positive optical power. The design is based on the shape and parameters of the fifth lens L5. The fourth lens L4 and the fifth lens L5 are combined to form a cemented lens. Together with the second lens L2 and the third lens L3 that form the cemented lens, they form a symmetrical double Gaussian structure. This is beneficial for achieving high light transmission and further helps to correct aberrations such as chromatic aberration, coma, and distortion in the optical lens, resulting in a clearer image.

[0137] The sixth lens L6 has positive optical power. Based on the shape and parameters of the sixth lens L6, both the object side S10 and the image side S11 of the sixth lens L6 are designed as convex structures to converge light rays. In addition, the sixth lens L6 is a glass spherical lens made of high-refractive-index material, which is beneficial for correcting spherical aberration of the overall optical lens and achieving high resolution.

[0138] The seventh lens L7 has negative optical power and is designed based on the shape and parameters of the seventh lens L7. The eighth lens L8 has positive optical power and is designed based on the shape and parameters of the eighth lens L8. The object side S12 of the seventh lens L7 has a convex structure, and the image side S13 of the seventh lens L7 has a concave structure. The object side S14 of the eighth lens L8 has a convex structure, and the image side S15 of the eighth lens L8 has a concave structure. That is, the shapes of the seventh lens L7 and the eighth lens L8 are convex and concave, which is beneficial for correcting coma, field curvature, and astigmatism of the overall system.

[0139] This embodiment, as a preferred embodiment, also designs the maximum field of view of the optical lens so that the FOV, f, and h of the optical lens satisfy the following condition:

[0140] 50≤(FOV×f) / h≤54;

[0141] 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 optical lens.

[0142] In some optional embodiments, the following parameters of the optical lens are also designed:

[0143] The BFL and f of the optical lens shall satisfy the following condition:

[0144] 0.25≤BFL / f≤0.3;

[0145] Where BFL is the back focal length of the optical lens, and f is the effective focal length of the optical lens.

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

[0147] 0.13≤BFL / TTL≤0.16;

[0148] Where BFL is the back focal length of the 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 optical lens.

[0149] The vehicle-mounted ADAS optical lens provided in this embodiment, through its structural design and related parameter design, has multiple characteristics such as large aperture, high image quality, small size, weak ghosting, and low cost.

[0150] In this embodiment, based on the above design of the shape and related parameters of the automotive ADAS optical lens, the parameter design of the automotive ADAS optical lens is as follows:

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

[0152]

[0153] The first lens L1 has positive optical power and can converge light rays, which can prevent the object-side light rays from being too divergent, so as to collect as much light as possible into the rear lens group. In addition, the first lens L1 is a glass spherical lens, which uses a high refractive index material, which is conducive to reducing the front diameter and realizing miniaturized design.

[0154] The second lens L2 has positive optical power, which converges light rays, while the third lens L3 has negative optical power, which diverges light rays. This further disperses the light rays from each field of view. At the same field of view, the light rays emitted from the image side S1 of the first lens L1 can give the rear lens a larger light receiving surface, thus enlarging the physical aperture of the aperture stop S6 and achieving a greater amount of light intake, which is beneficial to increasing the image illumination. At the same time, the second lens L2 and the third lens L3 are combined into a cemented lens, which is beneficial to the correction of chromatic aberration of the entire optical lens and to reducing the sensitivity tolerance of the optical lens.

[0155] The fourth lens L4 has positive or negative optical power, and the fourth lens L4 and the fifth lens L5 form a cemented lens. Together with the second lens L2 and the third lens L3 that form the cemented lens, they form a symmetrical double Gaussian structure, which is conducive to achieving high light transmission. Furthermore, it is beneficial to correct aberrations such as chromatic aberration, coma, and distortion in the optical lens, making the image clearer.

[0156] The sixth lens, L6, has positive optical power and acts as a light convergent lens. Furthermore, the sixth lens, L6, is a glass spherical lens made of high-refractive-index material, which helps correct spherical aberration in the overall optical lens and achieves high resolution.

[0157] The seventh lens L7 has negative optical power, and the eighth lens L8 has positive optical power, which is beneficial for correcting coma, field curvature, and astigmatism of the overall system.

[0158] Table 2: One design value for the optical lens protected in Example 1:

[0159]

[0160] 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.

[0161] Table 3: Other optical information of the optical lens protected in Example 1:

[0162]

[0163] In Table 3, D represents the effective optical aperture of the first lens L1.

[0164] In this embodiment, based on the shape design of the optical lens, combined with the above-mentioned parameter design, and in conjunction with... Figure 2 As shown in the simulation diagram of the field curvature and distortion of the optical lens, in Figure 2 In the left-hand coordinate system, the horizontal axis represents the field curvature of the automotive ADAS optical lens, in mm; the vertical axis represents the normalized image height, with 0 indicating on the optical axis. In the right-hand coordinate system, the horizontal axis represents the distortion (F-tanθ), in %; the vertical axis represents the normalized image height. Figure 2 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the automotive ADAS optical lens is effectively controlled. At the same time, the distortion (F-tanθ) curves of each wavelength coincide, and the maximum field distortion is less than -4%, indicating that the distortion of the automotive ADAS optical lens at each wavelength is well controlled, and the image height and field of view have a good linear relationship.

[0165] Combination Figure 3 As shown in the simulation diagram of the transverse aberration of the automotive ADAS optical lens, in Figure 3 In the figure, the vertical direction represents the normalized aperture, 0 indicates being 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 figure represent different wavelengths of imaging by the automotive ADAS optical lens, derived from... Figure 3 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 automotive ADAS optical lens at each wavelength has been well controlled.

[0166] Combination Figure 4 As shown in the schematic diagram of the MTF curve of the automotive ADAS optical lens, in Figure 4 In this context, MTF represents the overall imaging quality of automotive ADAS optical lenses. A higher MTF value indicates a clearer image. Figure 4 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 4 It can be seen that the automotive ADAS optical lens has excellent imaging quality within the field of view.

[0167] Example 2

[0168] This embodiment discloses an automotive ADAS optical lens, which, based on the lens shape design of the automotive ADAS optical lens in Embodiment 1, combines a seventh lens L7 and an eighth lens L8 into a cemented lens, such as... Figure 5 As shown.

[0169] Based on the lens shape design of the vehicle-mounted ADAS optical lens in Embodiment 1, the seventh lens L7 and the eighth lens L8 are combined to form a cemented lens, which is also beneficial for correcting coma, field curvature and astigmatism of the overall optical lens.

[0170] In this embodiment, based on the lens shape design of the automotive ADAS optical lens in Embodiment 1, the relevant parameters of the automotive ADAS optical lens are designed as follows:

[0171] Table 4: The focal length design of the optical lens protected in Example 2 is shown in the following table:

[0172]

[0173] Table 5: One design value for the optical lens protected in Example 2:

[0174]

[0175] In Table 5 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.

[0176] Table 6: Other optical information of the optical lens protected in Example 2:

[0177]

[0178] In Table 6, D represents the effective optical aperture of the first lens L1.

[0179] In this embodiment, based on the shape design of the optical lens, combined with the above-mentioned parameter design, and in conjunction with... Figure 6 As shown in the simulation diagram of the field curvature and distortion of the optical lens, in Figure 6In the left-hand coordinate system, the horizontal axis represents the field curvature of the automotive ADAS optical lens, in mm; the vertical axis represents the normalized image height, with 0 indicating on the optical axis. In the right-hand coordinate system, the horizontal axis represents the distortion (F-tanθ), in %; the vertical axis represents the normalized image height. Figure 6 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the automotive ADAS optical lens is effectively controlled. At the same time, the distortion (F-tanθ) curves of each wavelength coincide, and the maximum field distortion is less than -4%, indicating that the distortion of the automotive ADAS optical lens at each wavelength is well controlled, and the image height and field of view have a good linear relationship.

[0180] Combination Figure 7 As shown in the simulation diagram of the transverse aberration of the automotive ADAS optical lens, in Figure 7 In the figure, the vertical direction represents the normalized aperture, 0 indicates being 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 figure represent different wavelengths of imaging by the automotive ADAS optical lens, derived from... Figure 7 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 automotive ADAS optical lens at each wavelength has been well controlled.

[0181] Combination Figure 8 As shown in the schematic diagram of the MTF curve of the automotive ADAS optical lens, in Figure 8 In this context, MTF represents the overall imaging quality of automotive ADAS optical lenses. A higher MTF value indicates a clearer image. Figure 8 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 8 It can be seen that the automotive ADAS optical lens has excellent imaging quality within the field of view.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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 vehicle-mounted ADAS optical lens, characterized in that, include: The first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, and eighth lens are arranged sequentially along the optical axis from the object side to the image side; The first lens has positive optical power, the object side of the first lens has a convex structure, and the image side of the first lens has a concave structure. The second lens has positive optical power, the object side of the second lens has a convex structure, and the image side of the second lens has a concave structure; The third lens has negative optical power, the object side of the third lens has a convex structure, and the image side of the third lens has a concave structure. The fourth lens has a positive or negative optical power, and the object side and image side of the fourth lens have a concave structure. The fifth lens has positive optical power, and the object side and image side of the fifth lens have a convex structure; The sixth lens has positive optical power, and the object side and image side of the sixth lens have a convex structure; The seventh lens has negative optical power, the object side of the seventh lens has a convex structure, and the image side of the seventh lens has a concave structure. The eighth lens has positive optical power, the object side of the eighth lens has a convex structure, and the image side of the eighth lens has a concave structure. The second lens and the third lens together form a cemented lens; the fourth lens and the fifth lens together form a cemented lens.

2. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are all glass spherical lenses.

3. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The seventh lens and the eighth lens together form a cemented lens.

4. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.3≤f1 / f≤1.6; 1.1 ≤ f² / f ≤ 1.4; -0.65≤f3 / f≤-0.45; -0.55≤|f4 / f|≤-0.25; 0.35≤|f5 / f|≤6; 0.75≤f6 / f≤1.2; -2.3≤f7 / f≤-1.3; 0.85≤f8 / f≤1.5; 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, f8 is the effective focal length of the eighth lens, and f is the effective focal length of the optical lens.

5. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.9≤Nd1≤2.05; 1.45≤Nd2≤1.64; 1.7≤Nd3≤1.95; 1.65≤Nd4≤1.8; 1.7≤Nd5≤1.8; 1.85≤Nd6≤2.05; 1.7≤Nd7≤2.06; 1.4≤Nd8≤1.9; 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, Nd7 is the refractive index of the seventh lens, and Nd8 is the refractive index of the eighth lens.

6. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 23≤Vd1≤35; 70≤Vd2≤95; 25≤Vd3≤35; 25≤Vd4≤55; 21≤Vd5≤55; 20≤Vd6≤40; 23≤Vd7≤30; 40≤Vd8≤96; 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, Nd7 is the refractive index of the seventh lens, and Nd8 is the refractive index of the eighth lens.

7. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The FOV, f, and h of the optical lens satisfy the following condition: 55≤(FOV×f) / h≤60; 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 optical lens.

8. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The BFL and f of the optical lens satisfy the following condition: 0.25≤BFL / f≤0.3; Wherein, BFL is the back focal length of the optical lens, and f is the effective focal length of the optical lens.

9. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, The BFL and TTL of the optical lens satisfy the following condition: 0.13≤BFL / TTL≤0.16; Wherein, BFL is the back focal length of the 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 optical lens.

10. The vehicle-mounted ADAS optical lens according to claim 1, characterized in that, It also includes a filter, which is disposed on the outer side of the image side of the eighth lens.

Images