An intelligent traffic lens with large target area, large light transmission and high resolution

Abstract

The present invention discloses an intelligent traffic lens with a large target area, large light transmission and high resolution. The optical system of the intelligent traffic lens comprises 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 seventh lens L7, an eighth lens L8, an aperture C, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12 and an image plane IMG, which are arranged in sequence along the incident light path. The traffic lens satisfies the following conditional formula: 0.3≤|f u1 / f u2 |≤0.4, where f u1 is the effective focal length of the front lens group; f u2 The traffic lens of the present invention has the performance of large target area, large light transmission and high resolution.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical lenses, and in particular relates to an intelligent traffic lens with a large target surface, large light transmission and high resolution. Background Art

[0002] In intelligent transportation systems, the precise collection of image data depends on the front-end camera and the assembled lens. This component directly determines the accuracy of information acquisition.

[0003] In view of the special needs of intelligent transportation systems, the installed lenses must exhibit performance characteristics superior to ordinary lenses, specifically large target area, large light transmission and high definition.

[0004] However, the intelligent traffic lenses currently on the market still have shortcomings in fully meeting the requirements of large target area, large light transmission and high definition, and the market demand for lenses with these characteristics is continuing to grow.

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

[0006] In view of the shortcomings of the existing technology, the present invention provides an intelligent traffic lens with a large target area, large light transmission and high resolution.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an intelligent traffic lens with a large target area, large light transmission rate, and high resolution, wherein the optical system of the traffic lens comprises 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 seventh lens L7, an eighth lens L8, an aperture C, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and an image plane IMG, which are arranged in sequence along the incident light path.

[0008] The first lens L1, the fourth lens L4, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the eleventh lens L11, and the twelfth lens L12 have positive refractive power; the second lens L2, the third lens L3, the fifth lens L5, and the tenth lens L10 have negative refractive power;

[0009] The fourth lens L4 and the fifth lens L5 form a first cemented lens group; the ninth lens L9 and the tenth lens L10 form a second cemented lens group;

[0010] The first lens L1 to the eighth lens L8 constitute a front lens group; the ninth lens L9 to the twelfth lens L12 constitute a rear lens group.

[0011] The traffic lens satisfies the following condition: 0.3≤|f u1 / fu2 |≤0.4, where f u1 is the effective focal length of the front lens group; f u2 is the effective focal length of the rear lens group.

[0012] As a specific implementation method, in the traffic lens,

[0013] The first lens L1 is a positive meniscus lens with its convex surface facing the object;

[0014] The second lens L2 is a negative meniscus lens with its concave surface facing the image side;

[0015] The third lens L3 is a biconcave negative lens;

[0016] The fourth lens L4 is a biconvex positive lens;

[0017] The fifth lens L5 is a biconcave negative lens;

[0018] The sixth lens L6 is a biconvex positive lens;

[0019] The seventh lens is a biconvex positive lens or a meniscus positive lens with the convex surface facing the object;

[0020] The eighth lens L8 is a biconvex positive lens;

[0021] The ninth lens L9 is a biconvex positive lens;

[0022] The tenth lens L10 is a biconcave negative lens;

[0023] The eleventh lens L11 is a biconvex positive lens;

[0024] The twelfth lens L12 is a biconvex positive lens or a meniscus positive lens with its convex surface facing the object.

[0025] As a specific implementation, the traffic lens satisfies the following conditional formula: 104≤(FOV×f) / IH≤105, where FOV is the maximum field of view angle of the traffic lens, f is the effective focal length of the traffic lens, and IH is the maximum image plane height of the traffic lens.

[0026] As a specific implementation, the traffic lens satisfies the following condition: 0.01≤D / TTL≤0.04, wherein D represents the distance between the aperture and the adjacent lens behind it, and TTL is the total optical length of the traffic lens.

[0027] As a specific implementation, the twelfth lens L12 satisfies the following conditions: -1.2≤(R 121 -R 122 ) / (R 121 +R 122 )≤-0.9, where R 121is the curvature radius of the object side of the twelfth lens L12; R 122 is the radius of curvature of the image side.

[0028] As a specific implementation, the traffic lens also satisfies the following condition: 42≤|V d4 -V d5 |≤43, where V d4 is the Abbe number of the fourth lens L4; V d5 is the Abbe number of the fifth lens L5.

[0029] In a specific embodiment, when the seventh lens L7 and the twelfth lens L12 are both biconvex positive lenses, the air distance between the first lens L1 and the second lens L2 is 0.1200 mm; the air distance between the second lens L2 and the third lens L3 is 9.3910 mm; the air distance between the third lens L3 and the fourth lens L4 is 5.5456 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 1.6425 mm; the air distance between the sixth lens L6 and the seventh lens L7 is 0.1400 mm; the air distance between the seventh lens L7 and the eighth lens L8 is 7.1470 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 7.3315 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.2748 mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 4.6174 mm; and the air distance between the twelfth lens L12 and the image plane IMG is 16.2753 mm.

[0030] As a specific embodiment, when the seventh lens L7 is a biconvex positive lens and the twelfth lens L12 is a meniscus positive lens with the convex surface facing the object side, the air distance between the first lens L1 and the second lens L2 is 0.1200 mm; the air distance between the second lens L2 and the third lens L3 is 9.6136 mm; the air distance between the third lens L3 and the fourth lens L4 is 4.6807 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 1.4715 mm; the air distance between the sixth lens L6 and the fourth lens L7 is 1.6067 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 2.9103 mm; the air distance between the sixth lens L6 and the fourth lens L7 is 3.4447 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 4.6067 mm; the air distance between the sixth lens L6 and the fourth lens L7 is 3.4343 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 3.4067 mm; the air distance between the sixth lens L6 and the fourth lens L7 is 3.4447 mm; the air distance between the sixth lens L6 and the fourth lens L7 is 3.4447 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 3.4447 mm; the air distance between the sixth lens L6 and the fourth lens L7 is 3.4447 mm. The air distance of the seventh lens L7 is 0.1400mm; the air distance between the seventh lens L7 and the eighth lens L8 is 7.8039mm; the air distance between the eighth lens L8 and the ninth lens L9 is 7.8404mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.1827mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 4.3715mm; and the air distance between the twelfth lens L12 and the image plane IMG is 16.2780mm.

[0031] As a specific embodiment, when the seventh lens L7 is a meniscus positive lens with a convex surface facing the object side and the twelfth lens L12 is a biconvex positive lens, the air distance between the first lens L1 and the second lens L2 is 0.1300 mm; the air distance between the second lens L2 and the third lens L3 is 5.5342 mm; the air distance between the third lens L3 and the fourth lens L4 is 3.0832 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 5.8000 mm; the air distance between the sixth lens L6 and the fifth lens L7 is 5.8000 mm; the air distance between the sixth lens L6 and the fifth lens L7 is 5.8000 mm. The air distance of the seventh lens L7 is 0.1300 mm; the air distance between the seventh lens L7 and the eighth lens L8 is 9.9731 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 3.2308 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 2.7700 mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 0.4500 mm; and the air distance between the twelfth lens L12 and the image plane IMG is 8.4000 mm.

[0032] Compared with the existing technology, the present invention provides an intelligent traffic lens with a large target area, large light transmission and high resolution, which has the following beneficial effects:

[0033] 1) The present invention maintains the optical performance of the lens while achieving a large target area by rationally allocating the positions of the lenses in the optical system;

[0034] 2) The present invention optimizes optical performance and reduces chromatic aberration of imaging by introducing a cemented lens into the imaging system;

[0035] 3) The present invention achieves a wider field of view while ensuring image clarity by rationally allocating the positions of lenses with different optical powers;

[0036] 4) The present invention rationally distributes the optical power of the front group and the rear group, 0.3≤|f u1 / f u2 |≤0.4, to meet the requirement of clear imaging on a large target surface;

[0037] 5) The present invention helps improve the imaging quality of the lens while taking into account the requirement of a large field of view by reasonably setting the maximum field of view angle and focal length of the lens, that is, requiring 104≤(FOV×f) / IH≤105;

[0038] 6) The present invention satisfies the need for high light transmission by rationally adjusting the distance between the aperture and the adjacent lens behind it, i.e., 0.01≤D / TTL≤0.04;

[0039] 7) By reasonably setting the curvature of the twelfth lens L12, that is, -1.2≤(R 121 -R 122 ) / (R 121 +R 122)≤-0.9, reducing the aberration of the lens and controlling the back focus of the lens.

[0040] 8) By rationally selecting the Abbe number of the two lenses that make up the cemented lens, that is, 42≤|V d4 -V d5 |≤43, effectively reducing the chromatic aberration of the optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is the optical path diagram of the intelligent traffic lens with large target area, large light throughput and high resolution in Example 1;

[0042] Figure 2 This is the MTF curve of the visible light band of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 1;

[0043] Figure 3 This is a diagram of field curvature and distortion of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 1;

[0044] Figure 4 This is a relative illumination curve diagram of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 1;

[0045] Figure 5 This is a graph showing the axial aberration of the intelligent traffic lens with large target area, large light throughput and high resolution in the visible light band in Example 1;

[0046] Figure 6 This is a vertical axis chromatic aberration curve in the visible light band of the intelligent traffic lens with large target area, large light transmission and high resolution in Example 1;

[0047] Figure 7 This is the optical path diagram of the intelligent traffic lens with large target area, large light throughput and high resolution in Example 2;

[0048] Figure 8 This is the MTF curve of the visible light band of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 2;

[0049] Figure 9 This is a diagram of field curvature and distortion of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 2;

[0050] Figure 10 This is a relative illumination curve diagram of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 2;

[0051] Figure 11 This is a graph showing the axial aberration of the intelligent traffic lens with large target area, high light transmission and high resolution in the visible light band in Example 2;

[0052] Figure 12This is a vertical axis chromatic aberration curve in the visible light band of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 2;

[0053] Figure 13 This is the optical path diagram of the intelligent traffic lens with large target area, large light throughput and high resolution in Example 3;

[0054] Figure 14 This is the MTF curve of the visible light band of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 3;

[0055] Figure 15 This is a diagram of field curvature and distortion of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 3;

[0056] Figure 16 This is a relative illumination curve diagram of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 3;

[0057] Figure 17 This is a graph showing the axial aberration of the intelligent traffic lens with large target area, high light transmission and high resolution in the visible light band in Example 3;

[0058] Figure 18 This is a vertical axis chromatic aberration curve of the visible light band of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 3. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] The invention discloses an intelligent traffic lens with a large target area, large light transmission rate and high resolution. The optical system of the intelligent traffic lens comprises 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 seventh lens L7, an eighth lens L8, an aperture C, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12 and an image plane IMG, which are arranged in sequence along the incident light path.

[0061] Among them, the first lens L1, the fourth lens L4, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the eleventh lens L11, and the twelfth lens L12 have positive focal power; the second lens L2, the third lens L3, the fifth lens L5, and the tenth lens L10 have negative focal power; the fourth lens L4 and the fifth lens L5 form a first cemented lens group; the ninth lens L9 and the tenth lens L10 form a second cemented lens group; the first lens L1 to the eighth lens L8 form the front lens group; and the ninth lens L9 to the twelfth lens L12 form the rear lens group.

[0062] Here, the curved shape of the first lens L1 helps the lens to capture light at a large angle.

[0063] The second lens L2 can diverge the light collected by the first lens L1, allowing the light to smoothly transition to the rear optical system and reasonably controlling the optical focal length.

[0064] The third lens L3 can diverge the light collected by the second lens L2, control the focal length of the lens, and correct the astigmatism and spherical aberration of the lens, thereby improving the overall performance of the optical system.

[0065] The fourth lens L4 and the fifth lens L5 are cemented together to form a first cemented lens group, which can converge light while balancing the spherical aberration and axial chromatic aberration of the optical system. In addition, the design of the cemented lens helps to shorten the total optical length.

[0066] The sixth lens L6 can focus the light collected by the first cemented lens group and correct the aberrations to optimize the imaging performance of the lens group.

[0067] The seventh lens L7 can further focus the light collected by the sixth lens L6, while correcting the chromatic aberration and distortion of the lens, thereby improving the clarity and accuracy of the image.

[0068] The eighth lens L8 can focus the light collected by the seventh lens L7, and work together with the aperture to optimize the depth of field and imaging range of the lens.

[0069] The aperture C is placed between the eighth lens L8 and the cemented lens, and controls the imaging quality and performance of the optical system by limiting the propagation range and direction of the light beam.

[0070] The ninth lens L9 and the tenth lens L10 are cemented together to form a second cemented lens group. By using a combination of high and low refractive index lenses, it is beneficial to the rapid transition of the front light and compensates for chromatic aberration.

[0071] The eleventh lens L11 can focus the light collected by the second cemented lens group, correct the field curvature of the lens, and fine-tune the focal length of the lens to improve the imaging clarity of the lens.

[0072] The twelfth lens L12 can focus the light collected by the eleventh lens L11, thereby controlling the focal length and imaging field of view of the entire lens group and improving the overall stability of the optical system.

[0073] The lenses in the following embodiments are all made of glass with a normal refractive index.

[0074] Example 1

[0075] In the optical system of this example, the first lens L1 is a positive meniscus lens with its convex surface facing the object side; the second lens L2 is a negative meniscus lens with its concave surface facing the image side; the third lens L3 is a double-concave negative lens; the fourth lens L4 is a double-convex positive 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 double-convex positive lens; the ninth lens L9 is a double-convex positive lens; the tenth lens L10 is a double-concave negative lens; the eleventh lens L11 is a double-convex positive lens; and the twelfth lens L12 is a double-convex positive lens. The fourth lens L4 and the fifth lens L5, and the ninth lens L9 and the tenth lens L10 are cemented together. The optical path diagram of this traffic lens is shown in FIG. Figure 1 shown.

[0076] See Table 1, which lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number:

[0077] Table 1

[0078]

[0079] Infinity means infinity.

[0080] In this example, the air distance between the first lens L1 and the second lens L2 is 0.1200 mm; the air distance between the second lens L2 and the third lens L3 is 9.3910 mm; the air distance between the third lens L3 and the fourth lens L4 is 5.5456 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 1.6425 mm; the air distance between the sixth lens L6 and the seventh lens L7 is 0.1400 mm; the air distance between the seventh lens L7 and the eighth lens L8 is 7.1470 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 7.3315 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.2748 mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 4.6174 mm; and the air distance between the twelfth lens L12 and the image plane IMG is 16.2753 mm.

[0081] The technical indicators achieved by the optical system in this example are as follows:

[0082] 1) Maximum field of view of traffic camera: FOV = 70°;

[0083] 2) Effective focal length of the front lens group: f u1 =21.5494mm;

[0084] 3) Effective focal length of the rear lens group: f u2 =65.7912mm;

[0085] 4) Effective focal length of traffic lens: f = 16.3392mm;

[0086] 5) Maximum image height of traffic lens: IH = 10.949 mm;

[0087] 6) Distance between aperture C and ninth lens element L9: D = 1.8378 mm;

[0088] 7) Radius of curvature of the object side of the twelfth lens L12: R 121 =38.0698mm;

[0089] 8) Radius of curvature of the image-side surface of the twelfth lens L12: R 122 =-734.9608mm;

[0090] 9) Abbe number of the fourth lens L4: V d4 =17.94;

[0091] 10) Abbe number of the fifth lens L5: V d5 =60.79;

[0092] 11) Total optical length of traffic lens: TTL = 115.5950mm.

[0093] Then we get: |f u1 / f u2 |=0.3275; (FOV×f) / IH=104.4610; D / TTL=0.0159; (R 121 -R 122 ) / (R 121 +R 122 )=-1.1093;|V d4 -V d5 |=42.85.

[0094] Here, by reasonably allocating the optical power of the front and rear groups, that is, requiring 0.3≤|f u1 / f u2 |≤0.4, meeting the requirement of clear imaging on a large target surface of traffic lenses.

[0095] By properly setting the maximum field of view and focal length of the lens, that is, requiring 104≤(FOV×f) / IH≤105, it helps to improve the imaging quality of the lens while taking into account the requirements of a large field of view.

[0096] By properly adjusting the distance between the aperture and the adjacent lens behind it, that is, requiring 0.01≤D / TTL≤0.04, the demand for large light transmission is met.

[0097] By reasonably setting the curvature of the twelfth lens L12, that is, -1.2≤(R 121 -R 122 ) / (R 121 +R 122 )≤-0.9, reducing the aberration of the lens and controlling the back focus of the lens.

[0098] By reasonably selecting the Abbe number of the two lenses that make up the cemented lens, that is, 42≤|V d4 -V d5 |≤43, effectively reducing the chromatic aberration of the optical system.

[0099] The final imaging effect of the lens in this example is achieved through Figure 2 The MTF graph is used to evaluate the lens. The MTF curves under each field of view all decrease smoothly and have good consistency. As can be seen from the graph, the MTF value is not less than 0.4 at the spatial frequency of 60pl / mm in the edge field of view, which means that the lens has good imaging effect and resolution within the entire field of view. Figure 3 This is the field curvature distortion diagram of the lens of this embodiment. It can be seen that the distortion of this lens does not exceed 4.5%. Figure 4 It can be seen from the relative illumination curve of the lens of this embodiment that, under the maximum field of view, the relative illumination value of the lens is greater than 0.45; Figure 5 This is the axial aberration diagram of the lens of this embodiment. It can be seen that the maximum axial aberration does not exceed 0.14mm, and the image quality is good; Figure 6 This is a vertical axis chromatic aberration curve. It can be seen that the vertical axis chromatic aberration is less than 10μm.

[0100] Example 2

[0101] In the optical system of this example, the first lens L1 is a positive meniscus lens with its convex surface facing the object; the second lens L2 is a negative meniscus lens with its concave surface facing the image; the third lens L3 is a double-concave negative lens; the fourth lens L4 is a double-convex positive 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 double-convex positive lens; the ninth lens L9 is a double-convex positive lens; the tenth lens L10 is a double-concave negative lens; the eleventh lens L11 is a double-convex positive lens; and the twelfth lens L12 is a positive meniscus lens with its convex surface facing the object. The optical path diagram of this traffic lens is shown in FIG. Figure 7 shown.

[0102] See Table 2, which lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number:

[0103] Table 2

[0104]

[0105] Infinity means infinity.

[0106] In this example, the air distance between the first lens L1 and the second lens L2 is 0.1200 mm; the air distance between the second lens L2 and the third lens L3 is 9.6136 mm; the air distance between the third lens L3 and the fourth lens L4 is 4.6807 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 1.4715 mm; the air distance between the sixth lens L6 and the seventh lens L7 is 0.1400 mm; the air distance between the seventh lens L7 and the eighth lens L8 is 7.8039 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 7.8404 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.1827 mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 4.3715 mm; and the air distance between the twelfth lens L12 and the image plane IMG is 16.2780 mm.

[0107] The technical indicators achieved by the optical system in this example are as follows:

[0108] 1) Maximum field of view of traffic camera: FOV = 70°;

[0109] 2) Effective focal length of the front lens group: f u1 =22.1488mm;

[0110] 3) Effective focal length of the rear lens group: f u2 =66.4432mm;

[0111] 4) Effective focal length of traffic lens: f = 16.3319 mm;

[0112] 5) Maximum image height of traffic lens: IH = 10.949 mm;

[0113] 6) Distance between aperture C and ninth lens element L9: D = 4.4715 mm;

[0114] 7) Radius of curvature of the object side of the twelfth lens L12: R 121 =36.5460mm;

[0115] 8) Radius of curvature of the image-side surface of the twelfth lens L12: R 122=801.5858mm;

[0116] 9) Abbe number of the fourth lens L4: V d4 =17.94;

[0117] 10) Abbe number of the fifth lens L5: V d5 =60.79;

[0118] 11) Total optical length of traffic lens: TTL = 115.6120mm.

[0119] Then we get: |f u1 / f u2 |=0.3333; (FOV×f) / IH=104.4144; D / TTL=0.0387; (R 121 -R 122 ) / (R 121 +R 122 )=-0.9128;|V d4 -V d5 |=42.85.

[0120] The final imaging effect of the lens in this example is achieved through Figure 8-12 To evaluate, from Figure 8 As can be seen from the figure, the MTF curves under each field of view all decrease smoothly and have good consistency. It can be seen from the figure that the MTF value is greater than 0.5 at the spatial frequency of 60pl / mm in the edge field of view, which means that the lens has good imaging effect and resolution in the entire field of view. Figure 9 As can be seen from the field curvature distortion diagram, the distortion of this lens does not exceed 4.5%; Figure 10 It can be seen from the relative illumination curve of the lens of this embodiment that, under the maximum field of view, the relative illumination value of the lens is greater than 0.45; Figure 11 This is the axial aberration diagram of the lens of this embodiment. It can be seen that the maximum axial aberration does not exceed 0.08mm, and the image quality is good; Figure 12 This is a vertical axis chromatic aberration curve. It can be seen that the vertical axis chromatic aberration is less than 6μm.

[0121] Example 3

[0122] In the optical system of this example, the first lens L1 is a positive meniscus lens with its convex surface facing the object; the second lens L2 is a negative meniscus lens with its concave surface facing the image; the third lens L3 is a double-concave negative lens; the fourth lens L4 is a double-convex positive 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 positive meniscus lens with its convex surface facing the object; the eighth lens L8 is a double-convex positive lens; the ninth lens L9 is a double-convex positive lens; the tenth lens L10 is a double-concave negative lens; the eleventh lens L11 is a double-convex positive lens; and the twelfth lens L12 is a double-convex positive lens. The optical path diagram of this traffic lens is shown in FIG. Figure 13 shown.

[0123] See Table 3, which lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number:

[0124] Table 3

[0125]

[0126] Infinity means infinity.

[0127] In this example, the air distance between the first lens L1 and the second lens L2 is 0.1300 mm; the air distance between the second lens L2 and the third lens L3 is 5.5342 mm; the air distance between the third lens L3 and the fourth lens L4 is 3.0832 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 5.8000 mm; the air distance between the sixth lens L6 and the seventh lens L7 is 0.1300 mm; the air distance between the seventh lens L7 and the eighth lens L8 is 9.9731 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 3.2308 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 2.7700 mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 0.4500 mm; and the air distance between the twelfth lens L12 and the image plane IMG is 8.4000 mm.

[0128] The technical indicators achieved by the optical system in this example are as follows:

[0129] 1) Maximum field of view of traffic camera: FOV = 70°;

[0130] 2) Effective focal length of the front lens group: f u1 =22.7151mm;

[0131] 3) Effective focal length of the rear lens group: f u2 =63.2839mm;

[0132] 4) Effective focal length of traffic lens: f = 16.3336mm;

[0133] 5) Maximum image height of traffic lens: IH = 10.949mm;

[0134] 6) Distance between aperture C and ninth lens element L9: D = 2.0000 mm;

[0135] 7) Radius of curvature of the object side of the twelfth lens L12: R 121 =40.2992mm;

[0136] 8) Radius of curvature of the image-side surface of the twelfth lens L12: R 122 =-510.4861mm;

[0137] 9) Abbe number of the fourth lens L4: V d4 =17.94;

[0138] 10) Abbe number of the fifth lens L5: V d5 =60.79;

[0139] 11) Total optical length of traffic lens: TTL = 115.6640 mm.

[0140] Then we get: |f u1 / f u2 |=0.3589; (FOV×f) / IH=104.4252; D / TTL=0.0173; (R 121 -R 122 ) / (R 121 +R 122 )=-1.1714;|V d4 -V d5 |=42.85.

[0141] The final imaging effect of the lens in this example is achieved through Figure 14 To evaluate, from Figure 14 As can be seen from the figure, the MTF curves under each field of view all decrease smoothly and have good consistency. It can be seen from the figure that the MTF value is greater than 0.5 at the spatial frequency of 60pl / mm in the edge field of view, which means that the lens has good imaging effect and resolution in the entire field of view. Figure 15 As can be seen from the field curvature distortion diagram, the distortion of this lens does not exceed 4.5%; Figure 16 It can be seen from the relative illumination curve of the lens of this embodiment that, under the maximum field of view, the relative illumination value of the lens is greater than 0.45; Figure 17 This is the axial aberration diagram of the lens of this embodiment. It can be seen that the maximum axial aberration does not exceed 0.09mm, and the image quality is good; Figure 18 This is a vertical axis chromatic aberration curve. It can be seen that the vertical axis chromatic aberration is less than 5μm.

[0142] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An intelligent traffic lens with large target area, large light transmission and high resolution, characterized by: 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 seventh lens L7, an eighth lens L8, an aperture C, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12 and an image plane IMG, which are arranged in sequence along the incident light path. The first lens L1, the fourth lens L4, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, the eleventh lens L11, and the twelfth lens L12 have positive refractive power; the second lens L2, the third lens L3, the fifth lens L5, and the tenth lens L10 have negative refractive power; The fourth lens L4 and the fifth lens L5 form a first cemented lens group; the ninth lens L9 and the tenth lens L10 form a second cemented lens group; The first lens L1 to the eighth lens L8 constitute a front lens group; the ninth lens L9 to the twelfth lens L12 constitute a rear lens group. The traffic lens satisfies the following condition: 0.3≤|f u1 / f u2 |≤0.4, where f u1 is the effective focal length of the front lens group; f u2 is the effective focal length of the rear lens group; In the traffic footage, The first lens L1 is a positive meniscus lens with its convex surface facing the object; The second lens L2 is a negative meniscus lens with its concave surface facing the image side; The third lens L3 is a biconcave negative lens; The fourth lens L4 is a biconvex positive lens; The fifth lens L5 is a biconcave negative lens; The sixth lens L6 is a biconvex positive lens; The seventh lens is a biconvex positive lens or a meniscus positive lens with the convex surface facing the object; The eighth lens L8 is a biconvex positive lens; The ninth lens L9 is a biconvex positive lens; The tenth lens L10 is a biconcave negative lens; The eleventh lens L11 is a biconvex positive lens; The twelfth lens L12 is a biconvex positive lens or a meniscus positive lens with the convex surface facing the object; The twelfth lens L12 satisfies the following conditions: -1.2≤(R 121 -R 122 ) / (R 121 +R 122 )≤-0.9, where R 121 is the curvature radius of the object side of the twelfth lens L12; R 122 is the radius of curvature of the image side.

2. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: The traffic lens satisfies the following conditional formula: 104≤(FOV×f) / IH≤105, where FOV is the maximum field of view angle of the traffic lens, f is the effective focal length of the traffic lens, and IH is the maximum image plane height of the traffic lens.

3. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: The traffic lens satisfies the following conditional formula: 0.01≤D / TTL≤0.04, wherein D represents the distance between the aperture and the adjacent lens behind it, and TTL is the total optical length of the traffic lens.

4. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: The traffic lens also satisfies the following condition: 42≤|V d4 -V d5 |≤43, where V d4 is the Abbe number of the fourth lens L4; V d5 is the Abbe number of the fifth lens L5.

5. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: When the seventh lens L7 and the twelfth lens L12 are both biconvex positive lenses, the air distance between the first lens L1 and the second lens L2 is 0.1200 mm; the air distance between the second lens L2 and the third lens L3 is 9.3910 mm; The air distance between the third lens L3 and the fourth lens L4 is 5.5456mm; the air distance between the fifth lens L5 and the sixth lens L6 is 1.6425mm; the air distance between the sixth lens L6 and the seventh lens L7 is 0.1400mm; the air distance between the seventh lens L7 and the eighth lens L8 is 7.1470mm; the air distance between the eighth lens L8 and the ninth lens L9 is 7.3315mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.2748mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 4.6174mm; and the air distance between the twelfth lens L12 and the image plane IMG is 16.2753mm.

6. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: When the seventh lens L7 is a biconvex positive lens and the twelfth lens L12 is a meniscus positive lens with the convex surface facing the object, the air distance between the first lens L1 and the second lens L2 is 0.1200mm; the air distance between the second lens L2 and the third lens L3 is 9.6136mm; the air distance between the third lens L3 and the fourth lens L4 is 4.6807mm; the air distance between the fifth lens L5 and the sixth lens L6 is 1.4715mm; the air distance between the sixth lens L6 and the seventh lens L7 is 1.606mm; the air distance between the fifth lens L5 and the sixth lens L6 is 2 ...06mm; the air distance between the sixth lens L6 and the seventh lens L7 is The air distance is 0.1400mm; the air distance between the seventh lens L7 and the eighth lens L8 is 7.8039mm; the air distance between the eighth lens L8 and the ninth lens L9 is 7.8404mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.1827mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 4.3715mm; and the air distance between the twelfth lens L12 and the image plane IMG is 16.2780mm.

7. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: When the seventh lens L7 is a positive meniscus lens with its convex surface facing the object, and the twelfth lens L12 is a biconvex positive lens, the air distance between the first lens L1 and the second lens L2 is 0.1300 mm; the air distance between the second lens L2 and the third lens L3 is 5.5342 mm; and the air distance between the third lens L3 and the fourth lens L4 is 3.0832 mm. The air distance between the fifth lens L5 and the sixth lens L6 is 5.8000mm; the air distance between the sixth lens L6 and the seventh lens L7 is 0.1300mm; the air distance between the seventh lens L7 and the eighth lens L8 is 9.9731mm; the air distance between the eighth lens L8 and the ninth lens L9 is 3.2308mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 2.7700mm; the air distance between the eleventh lens L11 and the twelfth lens L12 is 0.4500mm; and the air distance between the twelfth lens L12 and the image plane IMG is 8.4000mm.

Images