Intelligent traffic lens with low distortion, large target surface, high light transmission and high resolution

Abstract

The invention discloses an intelligent traffic lens with low distortion, large target surface, large light transmission and high resolution, and an optical system of the intelligent traffic lens is composed of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm C, a seventh lens L7, an eighth lens L8, a ninth lens L9 and an image plane IMG which are sequentially arranged along an incident light path. The first lens L1 to the sixth lens L6 form a front group lens; the seventh lens L7 to the ninth lens L9 form a rear group lens; the third lens L3 and the fourth lens L4 form a first glued lens group; the fifth lens L5 and the sixth lens L6 form a second glued lens group; the traffic lens satisfies the following conditional expression: 1.1 < = (fG1 * f / fG2) * tan (FOV / 4) < = 1.5. The traffic lens provided by the invention has the characteristics of low distortion, large target surface, high light transmission and high resolution.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical lenses, and particularly relates to an intelligent transportation lens with low distortion, large image circle, large aperture, and high resolution. Background Art

[0002] In an intelligent transportation system, the accuracy of information acquisition directly depends on the precise acquisition of image data by the front-end camera and the lens it is equipped with.

[0003] Given the special requirements of the system for performance, the configured lens needs to exhibit performance characteristics beyond the conventional, specifically manifested as low distortion, large image circle, large aperture, and high resolution.

[0004] However, the current intelligent transportation lenses on the market still have deficiencies in fully meeting the requirements of low distortion, large image circle, large aperture, and high resolution, while the market demand for lenses with these high-performance characteristics is continuously increasing.

[0005] Therefore, developing a lens that can fully meet the above requirements has become an urgent task at present. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides an intelligent transportation lens with low distortion, large image circle, large aperture, and high resolution.

[0007] To achieve the above object, the present invention provides the following technical solution: An intelligent transportation lens with low distortion, large image circle, large aperture, and high resolution, wherein the optical system of the transportation lens consists of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm C, a seventh lens L7, an eighth lens L8, a ninth lens L9, and an image plane IMG arranged in sequence along the incident light path. The first lens L1 is a meniscus positive lens with the convex surface facing the object side; The second lens L2 is a biconvex positive lens or a meniscus positive lens with the convex surface facing the object side; The third lens L3 is a biconvex positive lens; The fourth lens L4 is a biconcave negative lens; The fifth lens L5 is a biconcave negative lens; The sixth lens L6 is a biconvex positive lens; The seventh lens L7 is a biconvex positive lens; The eighth lens L8 is a meniscus positive lens with the convex surface facing the object side; The ninth lens L9 is a meniscus negative lens with the concave surface facing the image side or a biconcave negative lens; The first lens L1 to the sixth lens L6 form the front group of lenses; the seventh lens L7 to the ninth lens L9 form the rear group of lenses; The third lens L3 and the fourth lens L4 form a first cemented lens group; the fifth lens L5 and the sixth lens L6 form a second cemented lens group; The traffic lens satisfies the following conditional formula: 1.1 ≤ (f G1 × f / f G2 ) × tan(FOV / 4) ≤ 1.5, where f G1 represents the effective focal length of the first cemented lens group; f G2 represents the effective focal length of the second cemented lens group; f represents the effective focal length of the traffic lens; FOV represents the maximum field of view angle of the traffic lens.

[0008] As a specific implementation manner, the traffic lens further satisfies the following conditional formula: 6.0 ≤ |f u1 / f u2 | ≤ 7.3, where f u1 represents the effective focal length of the front lens group; f u2 represents the effective focal length of the rear lens group.

[0009] As a specific implementation manner, the traffic lens further satisfies the following conditional formula: 1.1 ≤ FOV / CRA ≤ 1.3, where FOV represents the maximum field of view angle of the traffic lens; CRA represents the chief ray angle of the traffic lens.

[0010] As a specific implementation manner, the traffic lens further satisfies the following conditional formula: 0.05 ≤ D / TTL ≤ 0.11, D represents the sum of the distances between the aperture stop C and the adjacent front and rear lenses; TTL represents the overall optical length of the traffic lens.

[0011] As a specific implementation manner, the ninth lens L9 satisfies the following condition: 0.8 ≤ (R 91 - R 92 ) / (R 91 + R 92 ) ≤ 1.1, where R 91 represents the curvature radius of the object side of the ninth lens L9; R 92 represents the curvature radius of the image side of the ninth lens L9.

[0012] As a specific implementation manner, the traffic lens further satisfies the following conditional formula: 53 ≤ |V d3 - V d4 | ≤ 54, where V d3 represents the Abbe number of the third lens L3; V d4 represents the Abbe number of the fourth lens L4.

[0013] As a specific embodiment, when the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a meniscus positive lens with its convex surface facing the object side; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; and the ninth lens L9 is a meniscus negative lens with its concave surface facing the image side, the air distance from the first lens L1 to the second lens L2 is 11.9695 mm; the air distance from the second lens L2 to the third lens L3 is 0.1000 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 5.0987 mm; the air distance from the sixth lens L6 to the diaphragm C is 1.9249 mm; the air distance from the diaphragm C to the seventh lens L7 is 2.5000 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.6895 mm; and the air distance from the ninth lens L9 to the image plane IMG is 17.2737 mm.

[0014] As a specific embodiment, when the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a biconvex positive lens; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; and the ninth lens L9 is a meniscus negative lens with its concave surface facing the image side, the air distance from the first lens L1 to the second lens L2 is 12.6475 mm; the air distance from the second lens L2 to the third lens L3 is 0.0931 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 4.5468 mm; the air distance from the sixth lens L6 to the diaphragm C is 1.7186 mm; the air distance from the diaphragm C to the seventh lens L7 is 6.8206 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.6965 mm; and the air distance from the ninth lens L9 to the image plane IMG is 15.5862 mm.

[0015] As a specific embodiment, when the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a meniscus positive lens with its convex surface facing the object side; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; and the ninth lens L9 is a biconcave negative lens, the air distance from the first lens L1 to the second lens L2 is 11.3178 mm; the air distance from the second lens L2 to the third lens L3 is 0.1000 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 5.1441 mm; the air distance from the sixth lens L6 to the aperture stop C is 3.1059 mm; the air distance from the aperture stop C to the seventh lens L7 is 4.0339 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.8268 mm; and the air distance from the ninth lens L9 to the image plane IMG is 14.9262 mm.

[0016] Compared with the prior art, the present invention provides an intelligent transportation lens with low distortion, large target surface, large light transmission, and high resolution, having the following beneficial effects: 1) By reasonably allocating the positions of the lenses in the optical system, the present invention realizes a large target surface while maintaining the optical performance of the lens. 2) By introducing a cemented lens into the imaging system, the present invention optimizes the optical performance and reduces the chromatic aberration of imaging. 3) By reasonably allocating the positions of the lenses with different focal powers, the present invention ensures the clarity of the image. 4) By reasonably allocating the focal power of the cemented lens, that is, requiring 1.1 ≤ (f G1 × f / f G2 ) × tan(FOV / 4) ≤ 1.5, the requirements of low distortion and low chromatic aberration are realized. 5) By reasonably allocating the focal power of the front group and the rear group, that is, requiring 6.0 ≤ |f u1 / f u2 | ≤ 7.3, the requirement of clear imaging of a large target surface is realized. 6) By reasonably adjusting the distances between the aperture stop and the adjacent front and rear lenses, that is, requiring 0.05 ≤ D / TTL ≤ 0.11, the requirement of large light transmission is further satisfied. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the optical path diagram of the intelligent transportation lens with low distortion, large target surface, large light transmission, and high resolution in Embodiment 1. Figure 2MTF curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 1; Figure 3 Field curvature and distortion diagram of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 1; Figure 4 Relative illumination curve of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 1; Figure 5 Axial aberration curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 1; Figure 6 Lateral chromatic aberration curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 1; Figure 7 Optical path diagram of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 2; Figure 8 MTF curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 2; Figure 9 Field curvature and distortion diagram of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 2; Figure 10 Relative illumination curve of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 2; Figure 11 Axial aberration curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 2; Figure 12 Lateral chromatic aberration curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 2; Figure 13 Optical path diagram of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 3; Figure 14 MTF curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 3; Figure 15 Field curvature and distortion diagram of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 3; Figure 16 Relative illumination curve of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 3; Figure 17 Axial aberration curve of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Example 3; Figure 18 It is the vertical chromatic aberration curve graph of the visible light band of the intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion in Embodiment 3. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] An intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion. The optical system of the transportation lens consists of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm C, a seventh lens L7, an eighth lens L8, a ninth lens L9 and an image plane IMG arranged in sequence along the incident light path. The first lens L1 is a meniscus positive lens with a convex surface facing the object side; the second lens L2 is a double convex positive lens or a meniscus positive lens with a convex surface facing the object side; the third lens L3 is a double convex positive lens; the fourth lens L4 is a double concave negative lens; the fifth lens L5 is a double concave negative lens; the sixth lens L6 is a double convex positive lens; the seventh lens L7 is a double convex positive lens; the eighth lens L8 is a meniscus positive lens with a convex surface facing the object side; the ninth lens L9 is a meniscus negative lens with a concave surface facing the image side or a double concave negative lens.

[0020] Among them, the first lens L1 to the sixth lens L6 form the front group of lenses; the seventh lens L7 to the ninth lens L9 form the rear group of lenses; the third lens L3 and the fourth lens L4 form the first cemented lens group; the fifth lens L5 and the sixth lens L6 form the second cemented lens group.

[0021] The bending shape of the first lens L1 is beneficial for the lens to obtain light at a large angle.

[0022] The second lens L2 can focus the light collected by the first lens L1, make the light transition smoothly to the rear optical system, and reasonably control the optical power.

[0023] The third lens L3 and the fourth lens L4 form the first cemented lens group. By using a combination of high and low refractive index lenses, it is beneficial for the front light to transition quickly and compensate for chromatic aberration.

[0024] The fifth lens L5 and the sixth lens L6 form the second cemented lens group, which can diverge light and balance the spherical aberration and axial chromatic aberration of the optical system at the same time.

[0025] The diaphragm C is placed between the cemented lens and the seventh lens L7, and controls the imaging quality and the performance of the optical system by restricting the propagation range and direction of the light beam.

[0026] The seventh lens L7 can focus the light collected by the second cemented lens group, and at the same time cooperate with the diaphragm to optimize the depth of field and imaging range of the lens.

[0027] The eighth lens L8 can further focus the light collected by the seventh lens L7, correct the aberration, and optimize the imaging performance of the lens group.

[0028] The ninth lens L9 can diverge the light collected by the eighth lens L8, correct the field curvature problem of the lens, and finely adjust the focal length of the lens to improve the imaging clarity of the lens.

[0029] The lenses in the following embodiments all use lenses made of glass materials with conventional refractive indices.

[0030] Embodiment 1

[0031] In the optical system of this example, the first lens L1 is a meniscus positive lens with the convex surface facing the object side; the second lens L2 is a meniscus positive lens with the convex surface facing the object side; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with the convex surface facing the object side; the ninth lens L9 is a meniscus negative lens with the concave surface facing the image side. The third lens L3 and the fourth lens L4 form the first cemented lens group; the fifth lens L5 and the sixth lens L6 form the second cemented lens group. The optical path diagram of this traffic lens is shown in Figure 1 as shown.

[0032] Referring to Table 1, Table 1 lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number: Table 1

[0033] Infinity means infinite.

[0034] In this example, the air distance from the first lens L1 to the second lens L2 is 11.9695 mm; the air distance from the second lens L2 to the third lens L3 is 0.1000 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 5.0987 mm; the air distance from the sixth lens L6 to the diaphragm C is 1.9249 mm; the air distance from the diaphragm C to the seventh lens L7 is 2.5000 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.6895 mm; the air distance from the ninth lens L9 to the image plane IMG is 17.2737 mm.

[0035] The technical indicators achieved by the optical system in this example are as follows: 1) Maximum field of view angle of the traffic lens: FOV = 18.6°; 2) Effective focal length of the first cemented lens group: f G1 = -49.2769 mm; 3) Effective focal length of the second cemented lens group: f G2 = -167.7638 mm; 4) Effective focal length of the front lens group: f u1 = 244.3417 mm; 5) Effective focal length of the rear lens group: f u2 = 33.5495 mm; 6) Chief ray angle of the traffic lens: CRA = 15.6246°; 7) Effective focal length of the traffic lens: f = 48.9917 mm; 8) Total optical length of the traffic lens: TTL = 83.0119 mm; 9) Sum of the distances between the aperture stop C and the adjacent lenses in front of and behind it: D = 4.4249 mm; 10) Curvature radius of the object side of the ninth lens L9: R 91 = 132.8200 mm; 11) Curvature radius of the image side of the ninth lens L9: R 92 = 14.1250 mm; 12) Abbe number of the third lens L3: V d3 = 81.61; 13) Abbe number of the fourth lens L4: V d4 = 27.76.

[0036] Furthermore, we get: (f G1 × f / f G2 ) × tan(FOV / 4) = 1.1704; |f u1 / f u2 | = 7.2830; FOV / CRA = 1.1904; D / TTL = 0.0533; (R 91 - R 92 ) / (R 91 + R 92 ) = 0.0878; |V d3 - V d4 | = 53.85.

[0037] Here, by reasonably distributing the optical power of the cemented lenses, that is, requiring 1.1 ≤ (f G1 × f / f G2 ) × tan(FOV / 4) ≤ 1.5, the requirements of low distortion and low chromatic aberration are achieved.

[0038] By reasonably distributing the optical power of the front group and the rear group, that is, requiring 6.0 ≤ |f u1 / f u2 | ≤ 7.3, the requirement for clear imaging with a large target surface is achieved.

[0039] By reasonably distributing the positions of the lenses in the optical system, that is, requiring 1.1 ≤ FOV / CRA ≤ 1.3, the requirement for low distortion is achieved.

[0040] By reasonably adjusting the distances between the aperture stop and the adjacent front and rear lenses, that is, requiring 0.05 ≤ D / TTL ≤ 0.11, the requirement for large light transmission is further satisfied.

[0041] By reasonably setting the curvature radius of the ninth lens L9, 0.8 ≤ (R 91 -R 92 ) / (R 91 +R 92 ) ≤ 1.1, and thus the reduction of the lens aberration and the control of the back focal length of the lens are achieved.

[0042] By reasonably selecting the Abbe numbers of the two lenses forming the cemented lens, that is, 53 ≤ |V d3 -V d4 | ≤ 54, the chromatic aberration of the optical system is effectively reduced.

[0043] The final imaging effect of the lens in this example is evaluated by the Figure 2 MTF diagram. The MTF curves at each field of view decrease smoothly and have good consistency. It can be seen from the diagram that at the spatial frequency of 60 pl / mm in the edge field of view, the MTF value is greater than 0.45, indicating that the lens has good imaging effect and resolution within the full field of view angle. From Figure 3 the field curvature and distortion diagram, it can be seen that the distortion of the lens does not exceed 0.3%; from Figure 4 the relative illumination curve, it can be seen that in the case of the maximum field of view, the relative illumination value of the lens is greater than 0.55; Figure 5 This is the axial aberration diagram of the lens in this embodiment. It can be seen that the maximum axial aberration does not exceed 0.05 mm, and the imaging quality is good; Figure 6 This is the lateral chromatic aberration curve diagram. It can be seen that the lateral chromatic aberration is less than 3 μm.

[0044] Embodiment 2

[0045] In the optical system of this example, the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a biconvex positive lens; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; the ninth lens L9 is a meniscus negative lens with its concave surface facing the image side. The optical path diagram of this traffic lens is shown in Figure 7 the figure shown below.

[0046] Referring to Table 2, Table 2 lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number: Table 2

[0047] Infinity means infinite.

[0048] In this example, the air distance from the first lens L1 to the second lens L2 is 12.6475 mm; the air distance from the second lens L2 to the third lens L3 is 0.0931 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 4.5468 mm; the air distance from the sixth lens L6 to the aperture stop C is 1.7186 mm; the air distance from the aperture stop C to the seventh lens L7 is 6.8206 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.6965 mm; the air distance from the ninth lens L9 to the image plane IMG is 15.5862 mm.

[0049] The technical indicators achieved by the optical system in this example are as follows: 1) The maximum field of view angle of the traffic lens: FOV = 18.6°; 2) The effective focal length of the first cemented lens group: f G1 = -46.6871 mm; 3) The effective focal length of the second cemented lens group: f G2 = -135.5381 mm; 4) The effective focal length of the front lens group: f u1 = 200.9917 mm; 5) The effective focal length of the rear lens group: f u2 = 33.2502 mm; 6) The chief ray angle of the traffic lens: CRA = 14.4409°; 7) The effective focal length of the traffic lens: f = 50.3984 mm; 8) The total optical length of the traffic lens: TTL = 84.2719 mm; 9) The sum of the distances between the aperture stop C and the adjacent front and rear lenses: D = 8.5392 mm; 10) The curvature radius of the object side of the ninth lens L9: R 91 = 610.3965 mm; 11) The curvature radius of the image side of the ninth lens L9: R 92 = 14.7617 mm; 12) The Abbe number of the third lens L3: V d3 = 81.61; 13) The Abbe number of the fourth lens L4: V d4 = 27.76.

[0050] Furthermore, we obtain: (f G1 × f / f G2 ) × tan(FOV / 4) = 1.4120; |f u1 / f u2 | = 6.0448; FOV / CRA = 1.2880; D / TTL = 0.1013; (R 91 - R 92 ) / (R 91 + R 92 ) = 0.9528; |V d3 - V d4 | = 53.85.

[0051] The final imaging effect of the lens in this example is evaluated by Figures 8 - 12 . It can be seen from Figure 8 that the MTF curves under each field of view decrease smoothly and have good consistency. It can be seen from the figure that at the spatial frequency of 60 pl / mm in the marginal field of view, the MTF value greater than 0.5 indicates that the lens has good imaging effect and resolution within the full field of view angle. It can be seen from Figure 9 of the field curvature and distortion diagram that the distortion of the lens does not exceed 0.35%; it can be seen from Figure 10 of the relative illumination curve that in the case of the maximum field of view, the relative illumination value of the lens is greater than 0.5; Figure 11 is the axial aberration diagram of the lens in this embodiment. It can be seen that the maximum axial aberration does not exceed 0.03 mm and the imaging quality is good; Figure 12 is the lateral chromatic aberration curve diagram. It can be seen that the lateral chromatic aberration is less than 1.5 μm.

[0052] Embodiment 3

[0053] In the optical system of this example, the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a meniscus positive lens with its convex surface facing the object side; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; the ninth lens L9 is a biconcave negative lens. The optical path diagram of this traffic lens is shown in Figure 13 as follows.

[0054] Referring to Table 3, Table 3 lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number: Table 3

[0055] Infinity means infinite.

[0056] In this example, the air distance from the first lens L1 to the second lens L2 is 11.3178 mm; the air distance from the second lens L2 to the third lens L3 is 0.1000 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 5.1441 mm; the air distance from the sixth lens L6 to the diaphragm C is 3.1059 mm; the air distance from the diaphragm C to the seventh lens L7 is 4.0339 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.8268 mm; the air distance from the ninth lens L9 to the image plane IMG is 14.9262 mm.

[0057] The technical indicators achieved by the optical system in this example are as follows: 1) The maximum field of view angle of the traffic lens: FOV = 18.6°; 2) The effective focal length of the first cemented lens group: f G1 = -47.7046 mm; 3) The effective focal length of the second cemented lens group: f G2 = -162.0261 mm; 4) The effective focal length of the front lens group: f u1 = 204.1278 mm; 5) The effective focal length of the rear lens group: f u2 = 33.1161 mm; 6) The chief ray angle of the traffic lens: CRA = 14.9340°; 7) The effective focal length of the traffic lens: f = 49.9392 mm; 8) The total optical length of the traffic lens: TTL = 83.5460 mm; 9) The sum of the distances between the aperture stop C and the adjacent front and rear lenses: D = 7.1398 mm; 10) The radius of curvature of the object side of the ninth lens L9: R 91 = -750.0002 mm; 11) The radius of curvature of the image side of the ninth lens L9: R 92 = 15.3244 mm; 12) The Abbe number of the third lens L3: V d3 = 81.61; 13) The Abbe number of the fourth lens L4: V d4 = 27.76.

[0058] Furthermore, we obtain: (f G1 × f / f G2 ) × tan(FOV / 4) = 1.1959; |f u1 / f u2 | = 6.1640; FOV / CRA = 1.2455; D / TTL = 0.0855; (R 91 - R 92 ) / (R 91 + R 92 ) = 1.0417; |V d3 - V d4 | = 53.85.

[0059] The final imaging effect of the lens in this example is evaluated by Figures 14 - 18 . It can be seen from Figure 14 that the MTF curves under each field of view decrease smoothly and have good consistency. It can be seen from the figure that at the spatial frequency of 60 pl / mm in the edge field of view, the MTF value is greater than 0.65, indicating that the lens has good imaging effect and resolution within the full field of view angle. It can be seen from Figure 15 of the field curvature and distortion diagram that the distortion of the lens does not exceed 0.3%; it can be seen from Figure 16 of the relative illumination curve that in the case of the maximum field of view, the relative illumination value of the lens is greater than 0.5; Figure 17 is the axial aberration diagram of the lens in this embodiment. It can be seen that the maximum axial aberration does not exceed 0.04 mm and the imaging quality is good; Figure 18 is the lateral chromatic aberration curve diagram. It can be seen that the lateral chromatic aberration is less than 1 μm.

[0060] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent transportation lens with a large target surface, low distortion, large light transmission, and high resolution, characterized in that, The optical system of the traffic lens consists of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a diaphragm C, a seventh lens L7, an eighth lens L8, a ninth lens L9 and an image plane IMG arranged in sequence along the incident optical path. The first lens L1 is a meniscus positive lens with its convex surface facing the object side. The second lens L2 is a biconvex positive lens or a meniscus positive lens with its convex surface facing the object side. The third lens L3 is a biconvex positive lens. The fourth lens L4 is a biconcave negative lens. The fifth lens L5 is a biconcave negative lens. The sixth lens L6 is a biconvex positive lens. The seventh lens L7 is a biconvex positive lens. The eighth lens L8 is a meniscus positive lens with its convex surface facing the object side. The ninth lens L9 is a meniscus negative lens with its concave surface facing the image side or a biconcave negative lens. The first lens L1 to the sixth lens L6 form the front lens group; the seventh lens L7 to the ninth lens L9 form the rear lens group. The third lens L3 and the fourth lens L4 form the first cemented lens group; the fifth lens L5 and the sixth lens L6 form the second cemented lens group. The traffic lens satisfies the following conditional formula: 1.1 ≤ (f G1 × f / f G2 ) × tan(FOV / 4) ≤ 1.5, where f G1 represents the effective focal length of the first cemented lens group; f G2 represents the effective focal length of the second cemented lens group; f represents the effective focal length of the traffic lens; FOV represents the maximum field of view angle of the traffic lens.

2. The intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion according to claim 1, characterized in that, The traffic lens also satisfies the following conditional expression: 6.0 ≤ |f u1 / f u2 | ≤ 7.3, where f u1 represents the effective focal length of the front lens group; f u2 represents the effective focal length of the rear lens group.

3. The intelligent transportation lens with a large target surface, large light transmission, and high resolution and low distortion according to claim 1, characterized in that, The traffic lens also satisfies the following conditional formula: 1.1 ≤ FOV / CRA ≤ 1.3, where FOV represents the maximum field of view angle of the traffic lens; CRA represents the chief ray angle of the traffic lens.

4. The intelligent transportation lens with a low distortion, large target surface, large light transmission, and high resolution according to claim 1, characterized in that, The traffic lens also satisfies the following conditional formula: 0.05 ≤ D / TTL ≤ 0.11, D represents the sum of the distances between the diaphragm C and the adjacent lenses before and after it; TTL represents the optical total length of the traffic lens.

5. The intelligent transportation lens with a large target surface, large light transmission and high resolution and low distortion according to claim 1, wherein, The ninth lens L9 satisfies the following condition: 0.8 ≤ (R 91 - R 92 ) / (R 91 + R 92 ) ≤ 1.1, where R 91 represents the radius of curvature of the object side of the ninth lens L9; R 92 represents the radius of curvature of the image side of the ninth lens L9.

6. The intelligent transportation lens with a large target surface, large light transmission, and high resolution and low distortion according to claim 1, characterized in that, The traffic lens also satisfies the following conditional expression: 53 ≤ |V d3 - V d4 | ≤ 54, where V d3 represents the Abbe number of the third lens L3; V d4 represents the Abbe number of the fourth lens L4.

7. An intelligent transportation lens with a large target surface, large light transmission, high resolution, and low distortion according to claim 1, characterized in that When the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a meniscus positive lens with its convex surface facing the object side; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; the ninth lens L9 is a meniscus negative lens with its concave surface facing the image side, the air distance from the first lens L1 to the second lens L2 is 11.9695 mm; the air distance from the second lens L2 to the third lens L3 is 0.1000 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 5.0987 mm; the air distance from the sixth lens L6 to the diaphragm C is 1.9249 mm; the air distance from the diaphragm C to the seventh lens L7 is 2.5000 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.6895 mm; the air distance from the ninth lens L9 to the image plane IMG is 17.2737 mm.

8. The intelligent transportation lens with a large target surface, large light transmission, and high resolution and low distortion according to claim 1, wherein, When the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a biconvex positive lens; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; and the ninth lens L9 is a meniscus negative lens with its concave surface facing the image side, the air distance from the first lens L1 to the second lens L2 is 12.6475 mm; the air distance from the second lens L2 to the third lens L3 is 0.0931 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 4.5468 mm; the air distance from the sixth lens L6 to the diaphragm C is 1.7186 mm; the air distance from the diaphragm C to the seventh lens L7 is 6.8206 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.6965 mm; and the air distance from the ninth lens L9 to the image plane IMG is 15.5862 mm.

9. The intelligent transportation lens with a large target surface, large light transmission, high resolution and low distortion according to claim 1, characterized in that, When the first lens L1 is a meniscus positive lens with its convex surface facing the object side; the second lens L2 is a meniscus positive lens with its convex surface facing the object side; the third lens L3 is a biconvex positive lens; the fourth lens L4 is a biconcave negative lens; the fifth lens L5 is a biconcave negative lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconvex positive lens; the eighth lens L8 is a meniscus positive lens with its convex surface facing the object side; and the ninth lens L9 is a biconcave negative lens, the air distance from the first lens L1 to the second lens L2 is 11.3178 mm; the air distance from the second lens L2 to the third lens L3 is 0.1000 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 5.1441 mm; the air distance from the sixth lens L6 to the diaphragm C is 3.1059 mm; the air distance from the diaphragm C to the seventh lens L7 is 4.0339 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.1000 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.8268 mm; and the air distance from the ninth lens L9 to the image plane IMG is 14.9262 mm.

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