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 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 aperture C, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and an image plane IMG, which are sequentially arranged along the incident light path. The first lens L1 to the seventh lens L7 form a front lens group; the eighth lens L8 to the eleventh lens L11 form a rear lens group; the sixth lens L6 and the seventh lens L7 form a first cemented lens group; and the ninth lens L9 and the tenth lens L10 form a second cemented lens group. The traffic lens of the present invention has the characteristics of a 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 accuracy of information acquisition directly depends on the ability of the front-end camera and its equipped lens to accurately collect image data.

[0003] Given the specific requirements of this system, the lens must exhibit performance characteristics beyond the ordinary, specifically a large target area, large light transmission and high definition.

[0004] However, the current intelligent traffic lenses on the market still have shortcomings in fully meeting the requirements of large target area, large light transmission and high definition. At the same time, 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 aperture C, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and an image plane IMG, which are arranged in sequence along the incident light path.

[0008] The first lens L1 is a biconvex positive lens;

[0009] The second lens L2 is a negative meniscus lens with its concave surface facing the image side;

[0010] The third lens L3 is a biconcave negative lens;

[0011] The fourth lens L4 is a biconvex positive lens or a meniscus positive lens with the convex surface facing the image side;

[0012] The fifth lens L5 is a biconvex positive lens;

[0013] The sixth lens L6 is a biconvex positive lens;

[0014] The seventh lens L7 is a biconcave negative lens;

[0015] The eighth lens L8 is a biconvex positive lens;

[0016] The ninth lens L9 is a biconvex positive lens;

[0017] The tenth lens L10 is a biconcave negative lens;

[0018] The eleventh lens L11 is a biconvex positive lens or a meniscus positive lens with the convex surface facing the object.

[0019] The first lens L1 to the seventh lens L7 form a front lens group; the eighth lens L8 to the eleventh lens L11 form a rear lens group;

[0020] The sixth lens L6 and the seventh lens L7 form a first cemented lens group; the ninth lens L9 and the tenth lens L10 form a second cemented lens group;

[0021] The traffic lens satisfies the following condition: 2.7≤|f u1 / f u2 |≤7.0, where f u1 Indicates the effective focal length of the front lens group; f u2 represents the effective focal length of the rear lens group; at the same time, the traffic lens also satisfies the following conditional formula: 107≤(FOV×f) / IH≤111, wherein FOV represents the maximum field of view of the traffic lens; IH represents the maximum image plane height of the traffic lens, and f represents the effective focal length of the traffic lens.

[0022] As a specific implementation, the traffic lens also satisfies the following condition: 0.07≤D / TTL≤0.09, wherein D represents the distance between the two lenses before and after the aperture C; TTL represents the total optical length of the traffic lens.

[0023] As a specific implementation, the eleventh lens L11 satisfies the following conditions: -1.1≤(R 111 -R 112 ) / (R 111 +R 112 )≤-0.5, where R 111 R represents the curvature radius of the object side of the eleventh lens L11; 112 It represents the curvature radius of the image-side surface of the eleventh lens L11.

[0024] As a specific implementation, the traffic lens also satisfies the following condition: 46≤|V d6 -V d7 |≤47;V d6 V represents the Abbe number of the sixth lens L6; d7 represents the Abbe number of seventh lens L7.

[0025] As a specific embodiment, in the optical system of the traffic lens, when the fourth lens L4 is a biconvex positive lens and the eleventh lens L11 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 0.1000 mm; the air distance between the second lens L2 and the third lens L3 is 8.3000 mm; the air distance between the third lens L3 and the fourth lens L4 is 6.5282 mm; the air distance between the fourth lens L4 and the fifth lens L5 is 16.2807 mm. The air distance between the fifth lens L5 and the sixth lens L6 is 0.2000 mm; the air distance between the seventh lens L7 and the aperture C is 8.8527 mm; the air distance between the aperture C and the eighth lens L8 is 0.2000 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.0000 mm; and the air distance between the eleventh lens L11 and the image plane IMG is 14.0848 mm.

[0026] As a specific embodiment, in the optical system of the traffic lens, when the fourth lens L4 is a positive meniscus lens with its convex surface facing the image side, and the eleventh lens L11 is a positive meniscus lens with its convex surface facing the object side, the air distance between the first lens L1 and the second lens L2 is 0.1000 mm; the air distance between the second lens L2 and the third lens L3 is 9.1646 mm; the air distance between the third lens L3 and the fourth lens L4 is 8.0495 mm; and the air distance between the fourth lens L4 and the fifth lens L5 is 16. The air distance between the fifth lens L5 and the sixth lens L6 is 3355mm; the air distance between the seventh lens L7 and the aperture C is 7.9974mm; the air distance between the aperture C and the eighth lens L8 is 0.2000mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.0000mm; and the air distance between the eleventh lens L11 and the image plane IMG is 12.9052mm.

[0027] As a specific embodiment, in the optical system of the traffic lens, when the fourth lens L4 is a biconvex positive lens and the eleventh lens L11 is a biconvex positive lens, the air distance between the first lens L1 and the second lens L2 is 0.1000 mm; the air distance between the second lens L2 and the third lens L3 is 8.5914 mm; the air distance between the third lens L3 and the fourth lens L4 is 5.9351 mm; and the air distance between the fourth lens L4 and the fifth lens L5 is 13.1259 mm. The air distance between the fifth lens L5 and the sixth lens L6 is 0.2000mm; the air distance between the seventh lens L7 and the aperture C is 8.8884mm; the air distance between the aperture C and the eighth lens L8 is 0.2000mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.4420mm; and the air distance between the eleventh lens L11 and the image plane IMG is 15.2816mm.

[0028] 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:

[0029] 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;

[0030] 2) The present invention optimizes optical performance and reduces chromatic aberration of imaging by introducing a cemented lens into the imaging system;

[0031] 3) The present invention ensures image clarity by rationally allocating the positions of lenses with different optical powers;

[0032] 4) Improve the imaging quality of the lens by reasonably setting the maximum field of view and focal length of the lens;

[0033] 5) By properly adjusting the distance between the aperture and the adjacent lenses, the light transmission requirement can be maximized;

[0034] 6) By reasonably allocating the optical power of the front and rear groups, that is, requiring 2.7≤|f u1 / f u2 |≤7.0, to meet the demand for clear imaging on large target surfaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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;

[0036] 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;

[0037] Figure 3 This is a field curvature distortion diagram of the intelligent traffic lens with large target area, large light transmission and high resolution in Example 1;

[0038] 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;

[0039] 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;

[0040] 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;

[0041] 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;

[0042] 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;

[0043] Figure 9 This is a field curvature distortion diagram of the intelligent traffic lens with large target area, large light transmission and high resolution in Example 2;

[0044] 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;

[0045] 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;

[0046] Figure 12 This 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;

[0047] 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;

[0048] 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;

[0049] Figure 15 This is a field curvature distortion diagram of the intelligent traffic lens with large target area, high light transmission and high resolution in Example 3;

[0050] 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;

[0051] 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;

[0052] 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

[0053] 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.

[0054] Disclosed is an intelligent traffic lens with a large target area, large light throughput, and high resolution. 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 aperture C, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and an image plane IMG, which are sequentially arranged along an incident light path. The first lens L1 is a biconvex positive lens; 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 or a positive meniscus lens with its convex surface facing the image side; the fifth lens L5 is a biconvex positive lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconcave negative lens; 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; and the eleventh lens L11 is a biconvex positive lens or a positive meniscus lens with its convex surface facing the object side.

[0055] The first lens L1 to the seventh lens L7 form the front lens group; the eighth lens L8 to the eleventh lens L11 form the rear lens group; the sixth lens L6 and the seventh lens L7 form the first cemented lens group; the ninth lens L9 and the tenth lens L10 form the second cemented lens group.

[0056] The curved shape of the first lens L1 helps the lens capture light at a large angle.

[0057] The second lens L2 is used to diverge the light collected by the first lens L1, so that the light smoothly transitions to the rear optical system and reasonably controls the optical focal length.

[0058] The third lens L3 is used to 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 to improve the overall performance of the optical system.

[0059] The fourth lens L4 is used to focus the light collected by the third lens L3 and correct the aberrations to optimize the imaging performance of the lens group.

[0060] The fifth lens L5 is used to further focus the light collected by the fourth lens L4, while correcting the chromatic aberration and distortion of the lens to improve the clarity and accuracy of the image.

[0061] The sixth lens L6 and the seventh lens L7 are cemented together to diverge light while balancing the spherical aberration and axial chromatic aberration of the optical system.

[0062] The aperture C is placed between the cemented lens and the eighth lens L8 to control the imaging quality and the performance of the optical system by limiting the propagation range and direction of the light beam.

[0063] The eighth lens L8 can focus the light collected by the cemented lens and work together with the aperture C to optimize the depth of field and imaging range of the lens.

[0064] The ninth lens L9 and the tenth lens L10 are glued together. By using a combination of high and low refractive index lenses, it is beneficial to the rapid transition of the front light and compensate for chromatic aberration.

[0065] The eleventh lens L11 can focus the light collected by the cemented lens, thereby controlling the overall focal length and imaging field of view of the lens group and improving the overall stability of the optical system.

[0066] The lenses in the following embodiments are all made of glass with a normal refractive index.

[0067] Example 1

[0068] In the optical system of this example, the first lens L1 is a biconvex positive lens; the second lens L2 is a meniscus negative 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 biconvex positive lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconcave negative lens; 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 meniscus positive lens with its convex surface facing the object side; the sixth lens L6 and the seventh lens L7 form the first cemented lens group; the ninth lens L9 and the tenth lens L10 form the second cemented lens group. The optical path diagram of this traffic lens is shown in FIG. Figure 1 shown.

[0069] 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:

[0070] Table 1

[0071]

[0072] Infinity means infinity.

[0073] In this example, the air distance between the first lens L1 and the second lens L2 is 0.1000mm; the air distance between the second lens L2 and the third lens L3 is 8.3000mm; the air distance between the third lens L3 and the fourth lens L4 is 6.5282mm; the air distance between the fourth lens L4 and the fifth lens L5 is 16.2807mm; the air distance between the fifth lens L5 and the sixth lens L6 is 0.2000mm; the air distance between the seventh lens L7 and the aperture C is 8.8527mm; the air distance between the aperture C and the eighth lens L8 is 0.2000mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.0000mm; and the air distance between the eleventh lens L11 and the image plane IMG is 14.0848mm.

[0074] The technical indicators achieved by the optical system in this example are as follows:

[0075] 1) Maximum field of view of traffic lens: FOV = 54°;

[0076] 2) Effective focal length of the front lens group: f u1 =-111.7419mm;

[0077] 3) Effective focal length of the rear lens group: f u2 =22.9371mm;

[0078] 4) Effective focal length of traffic lens: f = 16.3176mm;

[0079] 5) Maximum image height of traffic lens: IH = 8mm;

[0080] 6) The radius of curvature of the object side of the eleventh lens L11: R 111 =21.0430mm;

[0081] 7) Radius of curvature of the image-side surface of the eleventh lens L11: R 112 =77.7000mm;

[0082] 8) Abbe number of the sixth lens element L6: V d6 =81.56;

[0083] 9) Abbe number of lens L7: V d7 =35.01;

[0084] 10) The distance between the two lenses before and after the aperture C: D = 9.0527mm;

[0085] 11) Total optical length of traffic lens: TTL = 106.3160mm.

[0086] Then we get: |f u1 / f u2 |=4.8717; (FOV×f) / IH=110.1438; D / TTL=0.0851; (R 111 -R 112 ) / (R 111 +R 112 )=-0.5738;|V d6 -V d7 |=46.55.

[0087] Here, by reasonably allocating the optical power of the front and rear groups, that is, requiring 2.7≤|f u1 / f u2 |≤7.0, to meet the demand for clear imaging on large target surfaces.

[0088] By reasonably allocating the optical power of the front and rear groups, that is, requiring 2.7≤|f u1 / f u2 |≤7.0, to meet the demand for clear imaging on large target surfaces.

[0089] By reasonably setting the maximum field of view angle and focal length of the lens, that is, requiring 107≤(FOV×f) / IH≤111, the imaging quality of the lens can be improved.

[0090] By properly adjusting the distance between the aperture and the adjacent lenses, that is, requiring 0.07≤D / TTL≤0.09, the demand for large light transmission can be met.

[0091] By properly setting the curvature radius of the eleventh lens L11, -1.1≤(R 111 -R 112 ) / (R 111 +R 112 )≤-0.5, thereby reducing the aberration of the lens and controlling the back focus of the lens.

[0092] By reasonably selecting the Abbe number of the two lenses that make up the cemented lens, that is, 46≤|V d6 -V d7 |≤47, effectively reducing the chromatic aberration of the optical system.

[0093] The final imaging effect of the lens in this example is achieved through Figure 2 The MTF graph shows that 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 greater than 0.7 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 3 As can be seen from the field curvature distortion diagram, the distortion of this lens does not exceed 3.5%; Figure 4 It can be seen from the relative illumination curve that at 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 of this embodiment. It can be seen that the maximum axial aberration does not exceed 0.06mm, and the imaging 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 2.5μm.

[0094] Example 2

[0095] In the optical system of this example, the first lens L1 is a biconvex positive lens; the second lens L2 is a meniscus negative lens with its concave side facing the image side; the third lens L3 is a biconcave negative lens; the fourth lens L4 is a meniscus positive lens with its convex side facing the image side; the fifth lens L5 is a biconvex positive lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconcave negative lens; 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; and the eleventh lens L11 is a meniscus positive lens with its convex side facing the object side. The optical path diagram of this traffic lens is shown in FIG. Figure 7 shown.

[0096] 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:

[0097] Table 2

[0098]

[0099] Infinity means infinity.

[0100] In this example, the air distance between the first lens L1 and the second lens L2 is 0.1000mm; the air distance between the second lens L2 and the third lens L3 is 9.1646mm; the air distance between the third lens L3 and the fourth lens L4 is 8.0495mm; the air distance between the fourth lens L4 and the fifth lens L5 is 16.3355mm; the air distance between the fifth lens L5 and the sixth lens L6 is 0.2000mm; the air distance between the seventh lens L7 and the aperture C is 7.9974mm; the air distance between the aperture C and the eighth lens L8 is 0.2000mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.0000mm; and the air distance between the eleventh lens L11 and the image plane IMG is 12.9052mm.

[0101] The technical indicators achieved by the optical system in this example are as follows:

[0102] 1) Maximum field of view of traffic lens: FOV = 54°;

[0103] 2) Effective focal length of the front lens group: f u1 =-158.3948mm;

[0104] 3) Effective focal length of the rear lens group: f u2 =22.9157mm;

[0105] 4) Effective focal length of traffic lens: f = 16.0955mm;

[0106] 5) Maximum image height of traffic lens: IH = 8mm;

[0107] 6) The radius of curvature of the object side of the eleventh lens L11: R 111 =20.5426mm;

[0108] 7) Radius of curvature of the image-side surface of the eleventh lens L11: R 112 =66.9471mm;

[0109] 8) Abbe number of the sixth lens element L6: V d6 =81.56;

[0110] 9) Abbe number of lens L7: V d7 =35.01;

[0111] 10) The distance between the two lenses before and after the aperture C: D = 8.1974mm;

[0112] 11) Total optical length of traffic lens: TTL = 106.6160 mm.

[0113] Then we get: |f u1 / f u2 |=6.9121; (FOV×f) / IH=108.6446; D / TTL=0.0769; (R 111 -R 112 ) / (R 111 +R 112 )=-0.5304;|V d6 -V d7 |=46.55.

[0114] 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 0.6 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 3.5%; Figure 10 It can be seen from the relative illumination curve that at the maximum field of view, the relative illumination value of the lens is greater than 0.55; 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 0.07mm, 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.

[0115] Example 3

[0116] In the optical system of this example, the first lens L1 is a biconvex positive lens; the second lens L2 is a meniscus negative lens with the concave side 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 biconvex positive lens; the sixth lens L6 is a biconvex positive lens; the seventh lens L7 is a biconcave negative lens; 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; and the eleventh lens L11 is a biconvex positive lens. The optical path diagram of this traffic lens is shown in FIG. Figure 13 shown.

[0117] 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:

[0118] Table 3

[0119]

[0120] Infinity means infinity.

[0121] In this example, the air distance between the first lens L1 and the second lens L2 is 0.1000 mm; the air distance between the second lens L2 and the third lens L3 is 8.5914 mm; the air distance between the third lens L3 and the fourth lens L4 is 5.9351 mm; the air distance between the fourth lens L4 and the fifth lens L5 is 13.1259 mm; the air distance between the fifth lens L5 and the sixth lens L6 is 0.2000 mm; the air distance between the seventh lens L7 and the aperture C is 8.8884 mm; the air distance between the aperture C and the eighth lens L8 is 0.2000 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.4420 mm; and the air distance between the eleventh lens L11 and the image plane IMG is 15.2816 mm.

[0122] The technical indicators achieved by the optical system in this example are as follows:

[0123] 1) Maximum field of view of traffic lens: FOV = 54°;

[0124] 2) Effective focal length of the front lens group: f u1 =-62.2276mm;

[0125] 3) Effective focal length of the rear lens group: f u2 =22.4452mm;

[0126] 4) Effective focal length of traffic lens: f = 16.0249 mm;

[0127] 5) Maximum image height of traffic lens: IH = 8mm;

[0128] 6) The radius of curvature of the object side of the eleventh lens L11: R 111 =27.3211mm;

[0129] 7) Radius of curvature of the image-side surface of the eleventh lens L11: R 112 =-579.4052mm;

[0130] 8) Abbe number of the sixth lens element L6: V d6 =81.56;

[0131] 9) Abbe number of lens L7: V d7 =35.01;

[0132] 10) The distance between the two lenses before and after the aperture C: D = 9.0884mm;

[0133] 11) Total optical length of traffic lens: TTL = 106.4990 mm.

[0134] Then we get: |f u1 / f u2 |=2.7724; (FOV×f) / IH=108.1681; D / TTL=0.0853; (R 111 -R 112 ) / (R 111 +R 112 )=-1.0990;|V d6 -V d7 |=46.55.

[0135] The final imaging effect of the lens in this example is achieved through Figure 14-18 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 0.7 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 15As can be seen from the field curvature distortion diagram, the distortion of this lens does not exceed 3%; Figure 16 It can be seen from the relative illumination curve that at the maximum field of view, the relative illumination value of the lens is greater than 0.5; 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 0.08mm, 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 3μm.

[0136] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, 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 aperture C, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and an image plane IMG, which are arranged in sequence along the incident light path. The first lens L1 is a biconvex positive lens; 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 or a meniscus positive lens with the convex surface facing the image side; The fifth lens L5 is a biconvex positive lens; The sixth lens L6 is a biconvex positive lens; The seventh lens L7 is a biconcave negative lens; 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 or a meniscus positive lens with the convex surface facing the object. The first lens L1 to the seventh lens L7 form a front lens group; the eighth lens L8 to the eleventh lens L11 form a rear lens group; The sixth lens L6 and the seventh lens L7 form a first cemented lens group; the ninth lens L9 and the tenth lens L10 form a second cemented lens group; The traffic lens satisfies the following condition: 2.7≤|f u1 / f u2 |≤7.0, where f u1 Indicates the effective focal length of the front lens group; f u2 represents the effective focal length of the rear lens group; and the traffic lens also satisfies the following conditional formula: 107≤(FOV×f) / IH≤111, where FOV represents the maximum field of view of the traffic lens; IH represents the maximum image plane height of the traffic lens, and f represents the effective focal length of the traffic lens; The eleventh lens L11 satisfies the following conditions: -1.1≤(R 111 -R 112 ) / (R 111 +R 112 )≤-0.5, where R 111 R represents the curvature radius of the object side of the eleventh lens L11; 112 It represents the curvature radius of the image-side surface of the eleventh lens L11.

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 also satisfies the following conditional formula: 0.07≤D / TTL≤0.09, wherein D represents the distance between the two lenses before and after the aperture C; and TTL represents the total optical length 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 also satisfies the following condition: 46≤|V d6 -V d7 |≤47;V d6 V represents the Abbe number of the sixth lens L6; d7 represents the Abbe number of seventh lens L7.

4. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: When the fourth lens L4 is a biconvex positive lens in the optical system of the traffic lens, and the eleventh lens L11 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 0.1000mm; the air distance between the second lens L2 and the third lens L3 is 8.3000mm; the air distance between the third lens L3 and the fourth lens L4 is 6.5282mm; the air distance between the fourth lens L4 and the fifth lens L5 is 16.2807mm; and the air distance between the fifth lens L5 and the first lens L6 is 16.2807mm. The air distance from the lens L5 to the sixth lens L6 is 0.2000mm; the air distance from the seventh lens L7 to the aperture C is 8.8527mm; the air distance from the aperture C to the eighth lens L8 is 0.2000mm; the air distance from the eighth lens L8 to the ninth lens L9 is 0.1000mm; the air distance from the tenth lens L10 to the eleventh lens L11 is 1.0000mm; and the air distance from the eleventh lens L11 to the image plane IMG is 14.0848mm.

5. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: When the fourth lens L4 is a positive meniscus lens with its convex surface facing the image side, and the eleventh lens L11 is a positive meniscus lens with its convex surface facing the object side in the optical system of the traffic lens, the air distance between the first lens L1 and the second lens L2 is 0.1000mm; the air distance between the second lens L2 and the third lens L3 is 9.1646mm; the air distance between the third lens L3 and the fourth lens L4 is 8.0495mm; and the air distance between the fourth lens L4 and the fifth lens L5 is 16.3355mm. The air distance between the fifth lens L5 and the sixth lens L6 is 0.2000 mm; the air distance between the seventh lens L7 and the aperture C is 7.9974 mm; the air distance between the aperture C and the eighth lens L8 is 0.2000 mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000 mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.0000 mm; and the air distance between the eleventh lens L11 and the image plane IMG is 12.9052 mm.

6. The intelligent traffic lens with large target area, large light transmission and high resolution according to claim 1, characterized in that: In the optical system of the traffic lens, when the fourth lens L4 is a biconvex positive lens and the eleventh lens L11 is a biconvex positive lens, the air distance between the first lens L1 and the second lens L2 is 0.1000mm; the air distance between the second lens L2 and the third lens L3 is 8.5914mm; the air distance between the third lens L3 and the fourth lens L4 is 5.9351mm; the air distance between the fourth lens L4 and the fifth lens L5 is 13.1259mm; the air distance between the fifth lens L5 and the sixth lens L6 is 0.2000mm; the air distance between the seventh lens L7 and the aperture C is 8.8884mm; the air distance between the aperture C and the eighth lens L8 is 0.2000mm; the air distance between the eighth lens L8 and the ninth lens L9 is 0.1000mm; the air distance between the tenth lens L10 and the eleventh lens L11 is 1.4420mm; and the air distance between the eleventh lens L11 and the image plane IMG is 15.2816mm.

Images