A surveillance lens with low distortion, large target area and high resolution

Abstract

The present invention discloses a low-distortion, large-target-surface, high-resolution surveillance lens, which comprises, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture C, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, and an eleventh lens L11, wherein the second lens L2 and the third lens L3 are closely connected to form a first cemented lens group; the fourth lens L4 and the fifth lens L5 are closely connected to form a second cemented lens group; the first lens L1 to the third lens L3 form a front lens group; the fourth lens L4 to the eleventh lens L11 form a rear lens group. The surveillance lens of the present invention has the performance of low distortion, large target surface, high resolution, and miniaturization.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a monitoring lens with low distortion, large target surface and high resolution. Background Art

[0002] Surveillance lenses are important components of intelligent transportation systems, responsible for obtaining information and determining the accuracy of information. Due to the particularity of the application environment, some performance of surveillance lenses needs to be better than that of ordinary lenses, such as smaller size, lower imaging distortion, larger imaging target area, and higher resolution.

[0003] Existing surveillance lenses are difficult to fully meet the above requirements. The market needs a surveillance lens with small size, low distortion, large target surface and high resolution. Therefore, it has become an urgent need to invent a surveillance lens that meets the above requirements. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a surveillance lens with low distortion, large target surface and high resolution, which has the performance of miniaturization, low distortion, large target surface and high resolution.

[0005] To achieve the above object, the present invention provides the following technical solution: a low-distortion, large-target-area, high-resolution surveillance lens, comprising, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture C, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, and an eleventh lens L11,

[0006] The first lens L1 is a positive meniscus lens with its convex surface facing the object;

[0007] The second lens L2 is a biconvex positive lens;

[0008] The third lens L3 is a double concave negative lens;

[0009] The fourth lens L4 is a meniscus negative lens or a double concave negative lens with a convex surface facing the image side;

[0010] The fifth lens L5 is a meniscus positive lens or a biconvex positive lens with a convex surface facing the image side;

[0011] The sixth lens L6 is a biconvex positive lens;

[0012] The seventh lens L7 is a meniscus positive lens or a biconvex positive lens with a convex surface facing the object;

[0013] The eighth lens L8 is a double concave negative lens;

[0014] The ninth lens L9 is a biconvex positive lens;

[0015] The tenth lens L10 is a double concave negative lens;

[0016] The eleventh lens L11 is a biconvex positive lens or a meniscus positive lens with the convex surface facing the image side;

[0017] The second lens L2 and the third lens L3 are closely connected to form a first cemented lens group; the fourth lens L4 and the fifth lens L5 are closely connected to form a second cemented lens group;

[0018] The first lens L1 to the third lens L3 constitute a front lens group; the fourth lens L4 to the eleventh lens L11 constitute a rear lens group;

[0019] The surveillance camera meets the following conditions: 7.4≤(f G1 ×f / f G2 )×tan(FOV / 4)≤9.1, where f G1 is the effective focal length of the first cemented lens group, f G2 is the effective focal length of the second cemented lens group, and FOV is the maximum field of view of the monitoring lens.

[0020] As a specific implementation, the monitoring lens satisfies the following condition: (FOV×f) / IH≤118.7, where FOV is the maximum field of view of the monitoring lens, f is the effective focal length of the monitoring lens, and IH is the maximum image plane height of the monitoring lens.

[0021] As a specific implementation method, the monitoring camera satisfies the following condition: u1 / f|≤31.5,|f u2 / f|≥0.75, 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, and f is the effective focal length of the monitoring lens.

[0022] As a specific implementation method, the monitoring lens satisfies the following condition: SD max / TTL≤0.31, where SD max is the clear aperture of the largest lens in the monitoring lens, and TTL is the total optical length of the monitoring lens, that is, the distance from the center of the object side of the first lens L1 to the imaging surface.

[0023] As a specific implementation, the monitoring lens satisfies the following condition: FOV / (D×TTL)≥0.03, where FOV is the maximum field of view of the monitoring lens, D is the aperture size of the monitoring lens head, and TTL is the total optical length of the monitoring lens.

[0024] As a specific implementation manner, the monitoring lens satisfies the following conditional formula: IH / FNO≥1.9, wherein IH is the maximum image plane height of the monitoring lens, and FNO is the aperture value of the monitoring lens.

[0025] As a specific implementation method, the monitoring lens satisfies the following condition: 79≤(f u1 +f u2 ) / IH≤148, 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.

[0026] As a specific implementation, the eleventh lens L11 satisfies the following conditions: N d11 ≤1.9;V D11 ≥42, where N d11 is the refractive index of the eleventh lens L11, V D11 is the Abbe number of the eleventh lens L11.

[0027] Compared with the prior art, the present invention provides a surveillance lens with low distortion, large target surface and high resolution, which has the following beneficial effects:

[0028] 1) The present invention achieves the requirement of low distortion by reasonably allocating the optical power of the cemented lens group;

[0029] 2) The present invention achieves the requirement of high resolution of the system by reasonably allocating the proportion of the focal power of the front and rear lens groups to the focal power of the entire lens;

[0030] 3) The present invention reasonably controls the focal length of the third lens L3 and the fourth lens L4 so that TTL is ≤ 52.7 mm to meet the demand for miniaturization;

[0031] 4) The eleventh lens L11 uses glass that is friendly to thermal drift, which effectively improves the stability of the lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the optical path diagram of the surveillance lens with low distortion, large target surface and high resolution in Example 1;

[0033] Figure 2 The MTF curve of the low-distortion, large-target, high-resolution surveillance lens in the visible light band in Example 1;

[0034] Figure 3 This is a field curvature distortion diagram of the low-distortion, large-target-area, high-resolution surveillance lens in Example 1;

[0035] Figure 4 This is the optical path diagram of the surveillance lens with low distortion, large target surface and high resolution in Example 2;

[0036] Figure 5 The MTF curve of the low-distortion, large-target, high-resolution surveillance lens in the visible light band in Example 2;

[0037] Figure 6 This is a field curvature distortion diagram of the low-distortion, large-target-area, high-resolution surveillance lens in Example 2;

[0038] Figure 7 This is the optical path diagram of the surveillance lens with low distortion, large target surface and high resolution in Example 3;

[0039] Figure 8 The MTF curve of the low-distortion, large-target, high-resolution surveillance lens in the visible light band in Example 3;

[0040] Fig. 9 This is a field curvature distortion diagram of the low-distortion, large-target-area, high-resolution surveillance lens in Example 3. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0042] The present invention provides a surveillance lens with low distortion, large target surface and high resolution, which comprises, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture C, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10 and an eleventh lens L11.

[0043] Here, the first lens L1 is a positive meniscus lens with a convex surface facing the object; the second lens L2 is a double convex positive lens; the third lens L3 is a double concave negative lens; the fourth lens L4 is a negative meniscus lens or a double concave negative lens with a convex surface facing the image; the fifth lens L5 is a positive meniscus lens or a double convex positive lens with a convex surface facing the image; the sixth lens L6 is a double convex positive lens; the seventh lens L7 is a positive meniscus lens or a double convex positive lens with a convex surface facing the object; the eighth lens L8 is a double concave negative lens; the ninth lens L9 is a double convex positive lens; the tenth lens L10 is a double concave negative lens; and the eleventh lens L11 is a double convex positive lens or a positive meniscus lens with a convex surface facing the image.

[0044] The second lens L2 and the third lens L3 are closely connected to form a first cemented lens group; the fourth lens L4 and the fifth lens L5 are closely connected to form a second cemented lens group. The first lens L1 to the third lens L3 form a front lens group; the fourth lens L4 to the eleventh lens L11 form a rear lens group.

[0045] Here, the first lens L1 is a meniscus lens, which focuses the light entering the lens, which is beneficial for obtaining more light.

[0046] The second lens L2 and the third lens L3 are glued together as a glued part to eliminate or balance the distortion produced by the lens and reduce the tolerance sensitivity. In addition, the second lens L2 and the third lens L3 are both glass lenses, which can effectively improve the stability and durability of the lens group.

[0047] The aperture C is placed between the third lens L3 and the fourth lens L4 to control the imaging quality and the performance of the optical system by limiting the propagation range and direction of the light beam.

[0048] The fourth lens L4 and the fifth lens L5 are glued together as a glued part to perform secondary correction on the light collected by the sixth lens L6 to balance the distortion produced by the lens. At the same time, the fourth lens L4 and the fifth lens L5 use glass lenses to further enhance the stability of the lens group.

[0049] The sixth lens L6 can compress the light corrected by the cemented component of the fourth lens L4 and the fifth lens L5, and transfer the light to the rear optical system.

[0050] The seventh lens L7 can collect and compress the light transmitted by the sixth lens L6.

[0051] The eighth lens L8 can correct the aberration of the light compressed by the seventh lens L7 again, thereby optimizing the imaging performance of the lens group.

[0052] The ninth lens L9 can transfer the light optimized by the eighth lens L8 to the rear optical system.

[0053] The tenth lens L10 can diverge the light compressed by the ninth lens L9, achieve aberration correction, and optimize the imaging performance of the lens group.

[0054] The eleventh lens L11 can focus the light and finally hit the imaging surface. Example 1

[0055] In the optical system of this example, the first lens L1 is a positive meniscus lens with the convex surface facing the object; the second lens L2 is a double convex positive lens; the third lens L3 is a double concave negative lens; the fourth lens L4 is a negative meniscus lens with the convex surface facing the image; the fifth lens L5 is a positive meniscus lens with the convex surface facing the image; the sixth lens L6 is a double convex positive lens; the seventh lens L7 is a positive meniscus lens with the convex surface facing the object; the eighth lens L8 is a double concave negative lens; the ninth lens L9 is a double convex positive lens; the tenth lens L10 is a double concave negative lens; and the eleventh lens L11 is a double convex positive lens. The optical path diagram of the monitoring lens is shown in Figure 1 shown.

[0056] 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:

[0057] Table 1

[0058]

[0059] Infinity means infinity.

[0060] In this example, the air distance from the first lens L1 to the second lens L2 is 0.1071 mm; the air distance from the third lens L3 to the aperture C is 4.7299 mm; the air distance from the aperture C to the fourth lens L4 is 2.1429 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.1290 mm; the air distance from the sixth lens L6 to the seventh lens L7 is 0.2000 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.4976 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 1.9260 mm; the air distance from the ninth lens L9 to the tenth lens L10 is 1.7062 mm; the air distance from the tenth lens L10 to the eleventh lens L11 is 1.4590 mm; and the air distance from the eleventh lens L11 to the image plane IMG is 4.9509 mm.

[0061] The technical indicators achieved by the optical system in this example are as follows:

[0062] 1) Maximum field of view of the surveillance camera: FOV = 26.000°;

[0063] 2) Effective focal length of the front lens: f u1 =615.8688mm;

[0064] 3) Effective focal length of the rear lens: f u2 =19.3787mm;

[0065] 4) Effective focal length of the first cemented lens group: f G1 =37.28 mm;

[0066] 5) Effective focal length of the second lens group: f G2 =-23.08mm;

[0067] 6) Effective focal length of surveillance lens: f=25.0617mm;

[0068] 7) Chief ray angle of the optical system: CRA = 3.1115°;

[0069] 8) Maximum image height of the monitoring lens: IH = 5.5000mm;

[0070] 9) Aperture value of monitoring lens: FNO = 2.8215;

[0071] 10) Monitoring lens head aperture size: D = 14.6002 mm;

[0072] 11) The aperture of the largest lens in the surveillance lens: SD max =14.6002mm;

[0073] 12) Total optical length of the monitoring lens: TTL = 52.6485 mm.

[0074] Then we get: (f G1 ×f / f G2 )×tan(FOV / 4) =8.9179; (FOV×f) / IH=118.4735; |f u1 / f|=24.5741;|f u2 / f|=0.7732; SD max / TTL=0.28;FOV / (D×TTL)=0.0338;IH / FNO=1.9493;(f u1 +f u2 ) / IH=115.4995.

[0075] Here, by properly distributing the focal power of the glued lens, that is, 7.4≤(f G1 ×f / f G2 )×tan(FOV / 4)≤9.1, achieving the requirement of low distortion.

[0076] By rationally combining lenses with different optical powers, that is, requiring (FOV×f) / IH≤118.7, the propagation light in the optical system is continuously corrected to achieve the low distortion requirement.

[0077] By reasonably allocating the proportion of the front and rear group focal lengths to the focal length of the entire lens, the system's high resolution requirements are met. By limiting the eleventh lens L11, that is, N d11 ≤1.9;V D11 ≥42, using glass that is friendly to thermal drift, effectively improving the stability of the lens group.

[0078] By limited SD max / TTL≤0.31, FOV / (D×TTL)≥0.03, miniaturization of the lens is achieved. By limiting IH / FNO≥1.9, 79≤(f u1 +f u2 ) / IH≤148, meeting the demand for large target area.

[0079] The final imaging effect of the lens in this example is achieved through Figure 2The MTF graph of the lens shows that the MTF curves in each field of view all drop gently and have good consistency. As can be seen from the graph, the MTF value of the edge field of view at the spatial frequency of 80pl / mm is greater than 0.6, which means that the lens has good imaging effect and resolution in the full 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 the lens does not exceed 4%. Example 2

[0080] In this example, in the optical system, the first lens L1 is a positive meniscus lens with the convex surface facing the object; the second lens L2 is a double convex positive lens; the third lens L3 is a double concave negative lens; the fourth lens L4 is a double concave negative lens; the fifth lens L5 is a double convex positive lens; the sixth lens L6 is a double convex positive lens; the seventh lens L7 is a positive meniscus lens with the convex surface facing the object; the eighth lens L8 is a double concave negative lens; the ninth lens L9 is a double convex positive lens; the tenth lens L10 is a double concave negative lens; and the eleventh lens L11 is a positive meniscus lens with the convex surface facing the image. The optical path diagram of the monitoring lens is shown in Figure 4 shown.

[0081] 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:

[0082] Table 2

[0083]

[0084] Infinity means infinity.

[0085] In this example, the air distance from the first lens L1 to the second lens L2 is 0.3500 mm; the air distance from the third lens L3 to the aperture C is 4.6538 mm; the air distance from the aperture C to the fourth lens L4 is 2.1813 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.2677 mm; the air distance from the sixth lens L6 to the seventh lens L7 is 0.1022 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.4974 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 1.4794 mm; the air distance from the ninth lens L9 to the tenth lens L10 is 1.1919 mm; the air distance from the tenth lens L10 to the eleventh lens L11 is 1.1919 mm; and the air distance from the eleventh lens L11 to the image plane IMG is 4.9751 mm.

[0086] The technical indicators achieved by the optical system in this example are as follows:

[0087] 1) Maximum field of view of the surveillance camera: FOV = 26.000°;

[0088] 2) Effective focal length of the front lens: f u1 =410.1126mm;

[0089] 3) Effective focal length of the rear lens: f u2 =25.0226 mm;

[0090] 4) Effective focal length of the first cemented lens group: f G1 =34.47mm;

[0091] 5) Effective focal length of the second lens group: f G2 =-25.53mm;

[0092] 6) Effective focal length of surveillance lens: f=25.0226mm;

[0093] 7) Chief ray angle of the optical system: CRA = 7.8505°;

[0094] 8) Maximum image height of the monitoring lens: IH = 5.5000mm;

[0095] 9) Aperture value of monitoring lens: FNO = 2.8163;

[0096] 10) Monitoring lens head aperture size: D = 15.7532mm;

[0097] 11) The aperture of the largest lens in the surveillance lens: SD max =15.7532mm;

[0098] 12) Total optical length of the monitoring lens: TTL = 52.6651mm.

[0099] Then we get: (f G1 ×f / f G2 )×tan(FOV / 4) =7.4420; (FOV×f) / IH=118.2887; |f u1 / f|=16.3897;|f u2 / f|=1.0000;SD max / TTL=0.30;FOV / (D×TTL)=0.0313;IH / FNO=1.9530;(f u1 +f u2 ) / IH=79.1155.

[0100] The final imaging effect of the lens in this example is achieved through Figure 5The MTF graph of the lens shows that the MTF curves in each field of view all drop gently and have good consistency. From the graph, we can see that the MTF value is greater than 0.65 at the spatial frequency of 80pl / mm in the edge field of view, which means that the lens has good imaging effect and resolution in the full field of view. Figure 6 This is the field curvature distortion diagram of the lens of this embodiment. It can be seen that the distortion of the lens does not exceed 4%. Example 3

[0101] In this example, the first lens L1 is a positive meniscus lens with the convex surface facing the object side; the second lens L2 is a double convex positive lens; the third lens L3 is a double concave negative lens; the fourth lens L4 is a double concave negative lens; the fifth lens L5 is a double convex positive 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 concave negative lens; the ninth lens L9 is a double convex positive lens; the tenth lens L10 is a double concave negative lens; and the eleventh lens L11 is a positive meniscus lens with the convex surface facing the image side. The optical path diagram of this monitoring lens is shown in Figure 7 shown.

[0102] 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:

[0103] Table 3

[0104]

[0105] Infinity means infinity.

[0106] In this example, the air distance from the first lens L1 to the second lens L2 is 0.5000 mm; the air distance from the third lens L3 to the aperture C is 4.5600 mm; the air distance from the aperture C to the fourth lens L4 is 2.1624 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.2802 mm; the air distance from the sixth lens L6 to the seventh lens L7 is 0.1072 mm; the air distance from the seventh lens L7 to the eighth lens L8 is 0.5923 mm; the air distance from the eighth lens L8 to the ninth lens L9 is 1.9571 mm; the air distance from the ninth lens L9 to the tenth lens L10 is 1.6937 mm; the air distance from the tenth lens L10 to the eleventh lens L11 is 1.5439 mm; and the air distance from the eleventh lens L11 to the image plane IMG is 4.9557 mm.

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

[0108] 1) Maximum field of view of the surveillance camera: FOV = 26.000°;

[0109] 2) Effective focal length of the front lens: fu1 =790.1161mm;

[0110] 3) Effective focal length of the rear lens: f u2 =18.9787mm;

[0111] 4) Effective focal length of the first cemented lens group: f G1 =40.56mm;

[0112] 5) Effective focal length of the second lens group: f G2 =-24.78mm;

[0113] 6) Effective focal length of surveillance lens: f=25.0947mm;

[0114] 7) Chief ray angle of the optical system: CRA = 4.2941°;

[0115] 8) Maximum image height of the monitoring lens: IH = 5.5000mm;

[0116] 9) Aperture value of monitoring lens: FNO = 2.8187;

[0117] 10) Monitoring lens head aperture size: D = 14.2796mm;

[0118] 11) The aperture of the largest lens in the surveillance lens: SD max =14.2796mm;

[0119] 12) Total optical length of the monitoring lens: TTL = 52.6525mm.

[0120] Then we get: (f G1 ×f / f G2 )×tan(FOV / 4) =9.0481; (FOV×f) / IH=118.6295; |f u1 / f|=31.4854;|f u2 / f|=0.7563; SD max / TTL=0.27;FOV / (D×TTL)=0.0346;IH / FNO=1.9513;(f u1 +f u2 ) / IH=147.1081.

[0121] The final imaging effect of the lens in this example is achieved through Figure 8-9 To evaluate, from Figure 8 It can be seen that the MTF value of the edge field of view is greater than 0.6 at the spatial frequency of 80pl / mm; Fig. 9 : is the field curvature distortion diagram of the lens of this embodiment, from which it can be seen that the distortion of the lens does not exceed 5%.

[0122] 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 protection scope of the present invention.

Claims

1. A surveillance lens with low distortion, large target surface and high resolution, characterized in that: The monitoring lens has 11 lenses in total, which include, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture C, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, and an eleventh lens L11. The first lens L1 is a positive meniscus lens with its convex surface facing the object; The second lens L2 is a biconvex positive lens; The third lens L3 is a double concave negative lens; The fourth lens L4 is a meniscus negative lens or a double concave negative lens with a convex surface facing the image side; The fifth lens L5 is a meniscus positive lens or a biconvex positive lens with a convex surface facing the image side; The sixth lens L6 is a biconvex positive lens; The seventh lens L7 is a meniscus positive lens or a biconvex positive lens with a convex surface facing the object; The eighth lens L8 is a double concave negative lens; The ninth lens L9 is a biconvex positive lens; The tenth lens L10 is a double concave negative lens; The eleventh lens L11 is a biconvex positive lens or a meniscus positive lens with the convex surface facing the image side; The second lens L2 and the third lens L3 are closely connected to form a first cemented lens group; the fourth lens L4 and the fifth lens L5 are closely connected to form a second cemented lens group; The first lens L1 to the third lens L3 constitute a front lens group; the fourth lens L4 to the eleventh lens L11 constitute a rear lens group; The surveillance camera meets the following conditions: 16.3897≤|f u1 / f|≤31.5,0.75≤|f u2 / f|≤1.0000, where f u1 is the effective focal length of the front lens group, f u2 is the effective focal length of the rear lens, f is the effective focal length of the monitoring lens, and the monitoring lens also meets the following condition: 79≤(f u1 +f u2 ) / IH≤148, 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.

2. The low-distortion, large-target-area, high-resolution surveillance lens according to claim 1, characterized in that: The monitoring lens satisfies the following condition: (FOV×f) / IH≤118.7, where FOV is the maximum field of view of the monitoring lens, f is the effective focal length of the monitoring lens, and IH is the maximum image plane height of the monitoring lens.

3. The low-distortion, large-target-area, high-resolution surveillance lens according to claim 1, characterized in that: The surveillance camera meets the following conditions: SD max / TTL≤0.31, where SD max is the clear aperture of the largest lens in the monitoring lens, and TTL is the total optical length of the monitoring lens, that is, the distance from the center of the object side of the first lens L1 to the imaging surface.

4. The low-distortion, large-target-area, high-resolution surveillance lens according to claim 1, characterized in that: The monitoring lens satisfies the following condition: 0.03≤FOV / (D×TTL) ≤0.0346, where FOV is the maximum field of view of the monitoring lens, D is the aperture size of the monitoring lens head, and TTL is the total optical length of the monitoring lens.

5. The low-distortion, large-target-area, high-resolution surveillance lens according to claim 1, characterized in that: The monitoring lens satisfies the following condition: 1.9≤IH / FNO≤1.9530, where IH is the maximum image plane height of the monitoring lens, and FNO is the aperture value of the monitoring lens.

6. The low-distortion, large-target-area, high-resolution surveillance lens according to claim 1, characterized in that: The eleventh lens L11 satisfies the following conditions: N d11 ≤1.9;V D11 ≥42, where N d11 is the refractive index of the eleventh lens L11, V D11 is the Abbe number of the eleventh lens L11.

Images