Security surveillance cameras and security surveillance camera modules

Abstract

The present invention discloses a security monitoring lens, which includes, in order from the object side to the image side along the optical axis: a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, the image side surface of which is convex near the optical axis; a fourth lens with a negative optical power, a fifth lens with a positive optical power. The security monitoring lens satisfies the following conditional expressions: 3.114 < TTL / f - tan(Semi-Fov) < 4.193; 12.799 < f2 / EPD < 14.2; 0.485 < F.No / ImgH < 0.505. Meeting the above three conditional expressions is conducive to meeting the requirements of a large viewing angle, small size, large aperture, large image surface, and high imaging quality.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a security monitoring lens and a security monitoring lens module. Background Technology

[0002] In recent years, with the continuous advancement of digital imaging technology, lenses have been widely used in the field of surveillance cameras. As the demand for surveillance lenses increases, the requirements for image quality and production yield also rise. Currently, wide-angle security surveillance lenses are large in size, have low image quality, and insufficient image plane and field of view. Therefore, it is necessary to design a security surveillance lens that simultaneously meets all of these requirements. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to propose a security monitoring lens and a security monitoring lens module that meets the requirements of wide field of view, small size, large aperture, large image area and high imaging quality.

[0004] Firstly, a security monitoring lens includes components arranged sequentially along the optical axis from the object side to the image side:

[0005] The first lens with negative optical power has an image-side surface that is concave near the optical axis.

[0006] A second lens with positive optical power has an object-side surface that is concave near the optical axis.

[0007] The third lens with positive optical power has a convex image-side surface near the optical axis;

[0008] The fourth lens with negative optical power has an image-side surface that is concave near the optical axis.

[0009] The fifth lens with positive optical power has a convex object-side surface near the optical axis;

[0010] The security monitoring camera satisfies the following condition:

[0011] 3.114 <TTL / f-tan(Semi-Fov)<4.193;

[0012] 12.799 <f2 / EPD<14.2;

[0013] 0.485 <F.No / ImgH<0.505;

[0014] Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the security monitoring lens; f is the total effective focal length of the security monitoring lens; Semi-Fov is half of the maximum field of view of the security monitoring lens; F.No is the aperture F-number of the security monitoring lens; ImgH is half the diagonal length of the effective pixel area on the imaging surface of the security monitoring lens; f2 is the effective focal length of the second lens; and EPD is the entrance pupil diameter of the security monitoring lens.

[0015] Optionally, the security monitoring camera satisfies the following condition:

[0016] 3.604 <f234 / (CT2+CT3+CT4)<5.201;

[0017] Wherein, f234 is the combined focal length of the second lens, the third lens, and the fourth lens; CT2 is the center thickness of the second lens on the optical axis; CT3 is the center thickness of the third lens on the optical axis; and CT4 is the center thickness of the fourth lens on the optical axis.

[0018] Optionally, the security monitoring camera satisfies the following condition:

[0019] -5.2 < (f-f1) / (f+f1) < -2.66;

[0020] Where f is the total effective focal length of the security monitoring lens; f1 is the effective focal length of the first lens.

[0021] Optionally, the security monitoring camera satisfies the following condition:

[0022] 4.311 < (R41 - R52) / f5 < 8.999;

[0023] Wherein, R41 is the radius of curvature of the object side of the fourth lens; R52 is the radius of curvature of the image side of the fifth lens; and f5 is the effective focal length of the fifth lens.

[0024] Optionally, the security monitoring camera satisfies the following condition:

[0025] 0.599 <EPD / (R11-R12)<1.213;

[0026] Wherein, EPD is the entrance pupil diameter of the security monitoring lens; R11 is the radius of curvature of the object side of the first lens; and R12 is the radius of curvature of the image side of the first lens.

[0027] Optionally, the security monitoring camera satisfies the following condition:

[0028] -119.971 <f34 / (ET3+ET4)<-17.274;

[0029] Wherein, f34 is the combined focal length of the third lens and the fourth lens; ET3 is the edge thickness of the third lens; and ET4 is the edge thickness of the fourth lens.

[0030] Optionally, the security monitoring camera satisfies the following condition:

[0031] 3.502 <TTL / (DT31+DT32)<4.764;

[0032] Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the security monitoring lens; DT31 is the maximum effective half-aperture of the object side of the third lens; and DT32 is the maximum effective half-aperture of the image side of the third lens.

[0033] Optionally, the security monitoring camera satisfies the following condition:

[0034] 0.591<(R51 / R52)×(SAG51 / SAG52)<0.912;

[0035] Wherein, R51 is the radius of curvature of the object-side surface of the fifth lens; R52 is the radius of curvature of the image-side surface of the fifth lens; SAG51 is the distance on the optical axis from the intersection of the object-side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object-side surface of the fifth lens; and SAG52 is the distance on the optical axis from the intersection of the image-side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image-side surface of the fifth lens.

[0036] Optionally, the security monitoring camera satisfies the following condition:

[0037] 1.034 <ET1 / CT1<1.616;

[0038] Wherein, ET1 is the edge thickness of the first lens; CT1 is the center thickness of the first lens on the optical axis.

[0039] Secondly, a security monitoring camera module is provided, including the security monitoring camera in any possible implementation of the first aspect.

[0040] The beneficial effects of the invention are:

[0041] Constraint 3.114 < TTL / f - tan(Semi - Fov) < 4.193. Constraining tan(Semi - Fov) within a reasonable range is beneficial for achieving a sufficiently large field of view angle for the security monitoring lens. On this premise, further constraining the TTL / f ratio within a reasonable range can also make the security monitoring lens have a smaller total length, which is beneficial for meeting the requirements of a large field of view angle and miniaturization of the security monitoring lens.

[0042] Constraint 0.485 < F.No / ImgH < 0.505; Constraining the F.No / ImgH ratio within a reasonable range is beneficial for achieving the characteristics of a large aperture and a large image plane.

[0043] Constraint 12.799 < f2 / EPD < 14.2. Constraining EPD within a reasonable range can, on the basis of meeting a large aperture and a large diameter, further constrain f2 within a reasonable range, which is beneficial for reasonably distributing the optical power of the second lens, reducing the spherical aberration of the security monitoring lens, improving the sine aberration of the security monitoring lens, and then reducing the aberration of the security monitoring lens, enabling the security monitoring lens to achieve better imaging quality.

[0044] Therefore, meeting the above three conditional expressions is beneficial for meeting the requirements of a large field of view angle, small size, large aperture, large image plane, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic structural diagram of the security monitoring lens of Embodiment 1 of the present application;

[0046] Figures 2 to 5 are successively the spherical aberration curve diagram, astigmatism curve diagram, distortion diagram, and longitudinal chromatic aberration diagram of the security monitoring lens of Embodiment 1 of the present application;

[0047] Figure 6 is a schematic structural diagram of the security monitoring lens of Embodiment 2 of the present application;

[0048] Figures 7 to 10 are successively the spherical aberration curve diagram, astigmatism curve diagram, distortion diagram, and longitudinal chromatic aberration diagram of the security monitoring lens of Embodiment 2 of the present application;

[0049] Figure 11 is a schematic structural diagram of the security monitoring lens of Embodiment 3 of the present application;

[0050] Figures 12 to 15 are successively the spherical aberration curve diagram, astigmatism curve diagram, distortion diagram, and longitudinal chromatic aberration diagram of the security monitoring lens of Embodiment 3 of the present application;

[0051] Figure 16 is a schematic structural diagram of the security monitoring lens of Embodiment 4 of the present application;

[0052] Figures 17 to 20The images shown in sequence are the spherical aberration curve, astigmatism curve, distortion diagram, and magnification chromatic aberration diagram of the security monitoring lens in Embodiment 4 of this application.

[0053] Figure 21 This is a schematic structural diagram of the security monitoring lens according to Embodiment 5 of this application;

[0054] Figures 22 to 25 The images shown are, in order, the spherical aberration curve, astigmatism curve, distortion diagram, and magnification chromatic aberration diagram of the security monitoring lens in Embodiment 5 of this application.

[0055] In the diagram: 100, security monitoring lens; 11, first lens; 12, second lens; 13, third lens; 14, fourth lens; 15, fifth lens; 16, filter; 17, image sensor. Detailed Implementation

[0056] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0057] It should be noted that, for ease of understanding and description, the embodiments of this application define the representation of relevant parameters of the security monitoring lens. For example, TTL represents the distance on the optical axis from the object side of the first lens to the imaging surface of the security monitoring lens; ImgH represents the maximum image height of the security monitoring lens. The letter representations in similar definitions are merely illustrative, and other forms can also be used. This application does not impose any limitations.

[0058] It should also be noted that the units of the parameters involving ratios in the following formulas are consistent. For example, the unit of the numerator is millimeters (mm), and the unit of the denominator is also millimeters (mm).

[0059] It should also be noted that the sign of the radius of curvature indicates whether the optical surface is convex to the object side or the image side. When the optical surface (including the object side or the image side) is convex to the object side, the radius of curvature of the optical surface is positive; when the optical surface (including the object side or the image side) is convex to the image side, it is equivalent to the optical surface being concave to the object side, and the radius of curvature of the optical surface is negative.

[0060] It should also be noted that the shape of the lens and the degree of concavity and convexity of the object side and image side in the accompanying drawings are merely schematic and do not limit the embodiments of this application. In this application, the lens material can be resin, plastic, or glass. Lenses include spherical lenses and aspherical lenses. The lens can be a fixed focal length lens, a zoom lens, a standard lens, a short focal length lens, or a long focal length lens.

[0061] like Figure 1As shown, the security monitoring lens 100 of this embodiment includes five lenses. For ease of description, the left side of the security monitoring lens 100 is defined as the object side (hereinafter also referred to as the object side), and the surface of the lens facing the object side can be called the object side surface, which can also be understood as the surface of the lens close to the object side. The right side of the security monitoring lens 100 is defined as the image side (hereinafter also referred to as the image side), and the surface of the lens facing the image side can be called the image side surface, which can also be understood as the surface of the lens close to the image side. From the object side to the image side, the security monitoring lens 100 of this embodiment includes, in sequence, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15; an aperture can also be provided near the object side surface of the third lens 13. An image sensor 17, such as a CCD or CMOS, can also be provided after the fifth lens 15. A filter 16, such as a flat infrared cut-off filter, can also be provided between the fifth lens 15 and the image sensor 17. The security monitoring lens 100 will be described in detail below.

[0062] refer to Figure 1 , Figure 1 The dashed line is used to indicate the optical axis of the lens.

[0063] The security monitoring lens 100 of this application embodiment includes, from the object side to the image side, the following in sequence:

[0064] First lens 11, second lens 12, third lens 13, fourth lens 14, and fifth lens 15.

[0065] It should be understood that the "various lenses of the security monitoring lens" mentioned above refer to the lenses that make up the security monitoring lens, which in this application embodiment are the first lens, the second lens, the third lens, the fourth lens, and the fifth lens.

[0066] Optionally, in the embodiments of this application,

[0067] The first lens 11 can have negative optical power. The object side S1 of the first lens 11 is convex near the optical axis, and the image side S2 of the first lens 11 is concave near the optical axis.

[0068] The second lens 12 can have positive optical power. The object side S3 of the second lens 12 is concave near the optical axis, and the image side S4 of the second lens 12 can be convex near the optical axis.

[0069] The third lens 13 can have positive optical power. The object side S5 of the third lens 13 is convex near the optical axis, and the image side S6 of the third lens 13 is convex near the optical axis.

[0070] The fourth lens 14 may have a negative optical power. The object side surface S7 of the fourth lens 14 is convex near the optical axis, and the image side surface S8 of the fourth lens 14 is concave near the optical axis;

[0071] The fifth lens 15 may have a positive optical power. The object side surface S9 of the fifth lens 15 is convex near the optical axis, and the image side surface S10 of the fifth lens 15 is convex near the optical axis.

[0072] The security monitoring lens 100 satisfies the following relationships:

[0073] 3.114 < TTL / f - tan(Semi-Fov) < 4.193;

[0074] 12.799 < f2 / EPD < 14.2;

[0075] 0.485 < F.No / ImgH < 0.505.

[0076] TTL / f - tan(Semi-Fov) can be 3.784, 3.114, 3.624, 4.108, 4.193; The constraint 3.114 < TTL / f - tan(Semi-Fov) < 4.193 is conducive to achieving a security monitoring lens with a sufficiently large field angle, and at the same time, it can also make the security monitoring lens have a smaller total length, which is conducive to meeting the requirements of a large field angle and miniaturization of the security monitoring lens.

[0077] f2 / EPD can be 12.799, 13.401, 12.8, 14.2. The constraint 12.799 < f2 / EPD < 14.2; can reasonably distribute the optical power of the second lens on the basis of meeting a large aperture and large diameter, reduce the spherical aberration of the security monitoring lens, improve the sine aberration of the security monitoring lens, and thus is conducive to reducing the aberration of the security monitoring lens and achieving better imaging quality.

[0078] F.No / ImgH can be 0.486, 0.485, 0.487, 0.505, 0.488; The constraint 0.485 < F.No / ImgH < 0.505; is conducive to achieving the characteristics of a large aperture and a large image plane.

[0079] In some implementation manners of the first aspect, the security monitoring lens satisfies: 3.604 < f234 / (CT2 + CT3 + CT4) < 5.201; f234 / (CT2 + CT3 + CT4) can be 3.604, 5.203, 5.154, 5.201, 4.168;

[0080] Constraint 3.604 < f234 / (CT2 + CT3 + CT4) < 5.201; It is beneficial to reasonably control the spherical aberration contribution rates of the second lens, the third lens, and the fourth lens, improve the imaging quality of the security monitoring lens; it can also effectively correct the system chromatic aberration of the security monitoring lens, and improve distortion and coma, improve the resolution of the security monitoring lens, and further improve the imaging quality.

[0081] In some implementations of the first aspect, the security monitoring lens satisfies: -5.2 < (f - f1) / (f + f1) < -2.66; (f - f1) / (f + f1) can be -5.2, -4.452, -2.660, -3.692, -3.286; Constraint -5.2 < (f - f1) / (f + f1) < -2.66; It can effectively control the shape of the first lens, improve the forming and processing performance of the first lens; it can also reasonably distribute the optical power of the first lens, which is beneficial to balancing the lateral chromatic aberration of the security monitoring lens and improving the imaging quality of the security monitoring lens.

[0082] In some implementations of the first aspect, the security monitoring lens satisfies: 4.311 < (R41 - R52) / f5 < 8.999; (R41 - R52) / f5 can be 4.373, 8.999, 4.311, 4.810, 4.296; Constraint 4.311 < (R41 - R52) / f5 < 8.999; It makes the curvature radius of the object side of the fourth lens and the curvature radius of the image side of the fifth lens have a higher matching degree with the focal length of the fifth lens, which is beneficial to controlling the contribution amount of the fourth lens and the fifth lens to the spherical aberration of the security monitoring lens, and then compensating for the spherical aberration generated by the fourth lens and the fifth lens to obtain better imaging quality.

[0083] In some implementations of the first aspect, the security monitoring lens satisfies: 0.599 < EPD / (R11 - R12) < 1.213; EPD / (R11 - R12) can be 0.599, 0.811, 1.213, 0.782, 0.829; Constraint 0.599 < EPD / (R11 - R12) < 1.213; It can constrain the incident angle of light, ensure sufficient light enters the security monitoring lens, improve the illuminance during imaging, and then improve the imaging quality of the security monitoring lens. In addition, it can also constrain the bending shape of the first lens, improve the processing performance and processing yield of the first lens, which is beneficial to the mass production requirements of the first lens.

[0084] In some implementations of the first aspect, the security monitoring lens satisfies: -119.971 < f34 / (ET3 + ET4) < -17.274; f34 / (ET3 + ET4) can be -83.503, -119.971, -64.066, -17.274, -112.486;

[0085] Constraint - 119.971 < f34 / (ET3 + ET4) < -17.274 can limit the shapes of the third lens and the fourth lens, which is beneficial to correcting the Petzval field curvature of the security monitoring lens and is beneficial to ensuring the processing characteristics of the lens.

[0086] In some implementations of the first aspect, the security monitoring lens satisfies: 3.502 < TTL / (DT31 + DT32) < 4.764; TTL / (DT31 + DT32) can be 4.192, 3.502, 4.337, 4.598, 4.764; controlling the maximum effective radius of the image side of the third lens within a reasonable range, thereby controlling the difference in the vertical direction of the image side of the third lens within a reasonable range, which is beneficial to the miniaturization of the security monitoring lens in the vertical direction; in addition, controlling TTL within a reasonable range is beneficial to the miniaturization of the security monitoring lens in the horizontal direction, thus being beneficial to the overall miniaturization of the security monitoring lens; in addition, controlling the maximum effective radius of the image side of the third lens within a reasonable range is also beneficial to the assembly of the security monitoring lens, is beneficial to increasing the number of light rays entering the image side of the third lens, improving the relative illumination of the security monitoring lens, and further improving the imaging quality of the security monitoring lens.

[0087] In some implementations of the first aspect, the security monitoring lens satisfies: 0.591 < (R51 / R52)×(SAG51 / SAG52) < 0.912; 0.59 < (R51 / R52)×(SAG51 / SAG52) can be 0.685, 0.912, 0.682, 0.591, 0.723; restricting 0.591 < (R51 / R52)×(SAG51 / SAG52) < 0.912 can restrict the curved surface shape of the fifth lens and improve the processing performance of the fifth lens; furthermore, it can also effectively reduce the spherical aberration, coma, and astigmatism generated by the system and improve the imaging quality.

[0088] In some implementations of the first aspect, the security monitoring lens satisfies: 1.034 < ET1 / CT1 < 1.616; ET1 / CT1 can be 1.616, 1.610, 1.034, 1.423, 1.203; restricting 1.034 < ET1 / CT1 < 1.616; controlling the edge thickness and the center thickness of the first lens within a reasonable range is beneficial to improving the processing characteristics of the first lens and is also beneficial to the stability of the lens group structure.

[0089] In the second aspect, a security monitoring lens module is provided, which includes the security monitoring lens in any possible implementation of the first aspect, and may also include an image sensor, an analog-to-digital converter, an image processor, a memory, etc., to implement the imaging function of the monitoring lens.

[0090] The following will combine Figures 1 to 25 Some specific, but not limiting, examples of embodiments of this application are described in more detail.

[0091] It should be noted that the embodiments of this application do not specifically limit the material of each lens of the security monitoring camera 100.

[0092] Example 1

[0093] One embodiment of this application's security monitoring lens 100 includes, from the object side to the image side, the following elements in sequence: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, as follows: Figure 1 As shown.

[0094] For ease of description, in the following embodiments, Stop represents the surface of the aperture stop, S1 represents the object-side surface of the first lens 11, S2 represents the image-side surface of the first lens 11, S3 represents the object-side surface of the second lens 12, S4 represents the image-side surface of the second lens 12, S5 represents the object-side surface of the third lens 13, S6 represents the image-side surface of the third lens 13, S7 represents the object-side surface of the fourth lens 14, S8 represents the image-side surface of the fourth lens 14, S9 represents the object-side surface of the fifth lens 15, S10 represents the image-side surface of the fifth lens 15, S11 represents the object-side surface of the filter, S12 represents the image-side surface of the filter, and S13 represents the imaging surface. The first lens 11 has negative optical power, and its object-side surface S1 is convex near the optical axis; its image-side surface S2 is concave near the optical axis. The second lens 12 has positive optical power, and its object-side surface S3 is concave near the optical axis; its image-side surface S4 is convex near the optical axis. The third lens 13 has positive optical power, and its object-side surface S5 is convex near the optical axis; its image-side surface S6 is convex near the optical axis. The fourth lens 14 has negative optical power, and its object-side surface S7 is convex near the optical axis; its image-side surface S8 is concave near the optical axis. The fifth lens 15 has positive optical power, and its object-side surface S9 is convex near the optical axis; its image-side surface S10 is convex near the optical axis.

[0095] Let TTL represent the total optical length of the security monitoring lens 100, ImgH represent the maximum image height of the security monitoring lens 100, and EFL represent the effective focal length of the security monitoring lens 100. Let αi represent the i-th order aspherical coefficient, i = 4, 6, 8, 10, 12, and K represent the conic coefficient.

[0096] Based on the above relationships, Table 1 shows the effective focal length (EFL), maximum field of view (Fov), total optical length (TTL), aperture (F.No.), surface type, radius of curvature, thickness, material refractive index, and conic coefficient of the security monitoring lens 100 in Embodiment 1. The units for radius of curvature and thickness are millimeters (mm), as shown in Table 1.

[0097] Table 1

[0098]

[0099] Table 2 shows the aspherical coefficients of the security monitoring lens 100 in Embodiment 1 of this application, as shown in Table 2:

[0100] Table 2

[0101] Face number A4 A6 A8 A10 A12 S1 -3.339E-03 1.992E-05 1.113E-05 -6.441E-07 1.207E-08 S2 -5.756E-03 1.557E-03 -3.851E-04 6.638E-05 -4.438E-06 S3 -1.571E-03 -7.261E-04 1.989E-04 -3.435E-05 1.736E-06 S4 -1.218E-04 1.419E-04 -4.319E-05 5.967E-06 -3.081E-07 S5 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S6 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S7 -9.016E-03 1.356E-03 -1.844E-04 1.447E-05 -5.135E-07 S8 3.985E-04 4.155E-04 -7.651E-05 2.942E-08 4.192E-07 S9 -1.845E-03 -1.116E-04 5.674E-06 -6.994E-06 6.777E-07 S10 -6.004E-04 -1.015E-04 2.646E-05 -3.513E-06 1.643E-07

[0102] Among them, the non-curved surfaces of each lens of the security monitoring camera 100 satisfy the following:

[0103]

[0104] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the radius of curvature r in Table 1 above); k is the conic constant (given in Table 1 above); Ai is the in-th order correction coefficient of the aspherical surface, and the higher-order coefficients A4, A6, A8, A10, and A12 of each lens surface S1-S10 are shown in Table 2.

[0105] It should be understood that the aspherical surfaces of each lens in the security monitoring camera 100 can use the aspherical surface shown in the above aspherical surface formula, or other aspherical surface formulas, and this application does not limit them.

[0106] The above provides design data for the security monitoring lens 100 of Embodiment 1 of this application, which has an effective focal length (EFL) of 4.332 mm, a maximum field of view (Fov) of 105.494 degrees, a total optical length (TTL) of 22.21 mm, and an aperture (F.No.) of 1.607.

[0107] In one embodiment provided in this application, TTL / f-tan(Semi-Fov)=3.784.

[0108] In one embodiment provided in this application, f2 / EPD = 12.799.

[0109] In one embodiment provided in this application, F.No / ImgH = 0.486.

[0110] In one embodiment provided in this application, f234 / (CT2+CT3+CT4)=3.604.

[0111] In one embodiment provided in this application, (f-f1) / (f+f1)=-5.200.

[0112] In one embodiment provided in this application, (R41-R52) / f5 = 4.373.

[0113] In one embodiment provided in this application, EPD / (R11-R12) = 0.599.

[0114] In one embodiment provided in this application, f34 / (ET3+ET4)=-83.503.

[0115] In one embodiment provided in this application, TTL / (DT31+DT32) = 4.192.

[0116] In one embodiment provided in this application, (R51 / R52)×(SAG51 / SAG52)=0.685.

[0117] In one embodiment provided in this application, ET1 / CT1 = 1.616.

[0118] Figures 2 to 5 The optical performance of the security monitoring lens 100 designed with the lens combination method of Embodiment 1 is described.

[0119] In Example 1, the security monitoring lens meets the requirements of a wide field of view, small size, large aperture, large image area, and high imaging quality.

[0120] Example 2

[0121] One embodiment of this application's security monitoring lens 100 includes, from the object side to the image side, the following elements in sequence: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, as follows: Figure 6 As shown.

[0122] For ease of description, in the following embodiments, Stop represents the surface of the aperture stop, S1 represents the object-side surface of the first lens 11, S2 represents the image-side surface of the first lens 11, S3 represents the object-side surface of the second lens 12, S4 represents the image-side surface of the second lens 12, S5 represents the object-side surface of the third lens 13, S6 represents the image-side surface of the third lens 13, S7 represents the object-side surface of the fourth lens 14, S8 represents the image-side surface of the fourth lens 14, S9 represents the object-side surface of the fifth lens 15, S10 represents the image-side surface of the fifth lens 15, S11 represents the object-side surface of the filter, S12 represents the image-side surface of the filter, and S13 represents the imaging surface. The first lens 11 has negative optical power, and its object-side surface S1 is convex near the optical axis; its image-side surface S2 is concave near the optical axis. The second lens 12 has positive optical power, and its object-side surface S3 is concave near the optical axis; its image-side surface S4 is convex near the optical axis. The third lens 13 has positive optical power, and its object-side surface S5 is convex near the optical axis; its image-side surface S6 is convex near the optical axis. The fourth lens 14 has negative optical power, and its object-side surface S7 is convex near the optical axis; its image-side surface S8 is concave near the optical axis. The fifth lens 15 has positive optical power, and its object-side surface S9 is convex near the optical axis; its image-side surface S10 is convex near the optical axis.

[0123] Let TTL represent the total optical length of the security monitoring lens 100, ImgH represent the maximum image height of the security monitoring lens 100, and EFL represent the effective focal length of the security monitoring lens 100. Let αi represent the i-th order aspherical coefficient, i = 4, 6, 8, 10, 12, and K represent the conic coefficient.

[0124] Based on the above relationships, Table 3 shows the effective focal length (EFL), maximum field of view (Fov), total optical length (TTL), aperture (F.No.), surface type, radius of curvature, thickness, material refractive index, and conic coefficient of the security monitoring lens 100 in Embodiment 2. The units for radius of curvature and thickness are millimeters (mm), as shown in Table 3.

[0125] Table 3

[0126]

[0127]

[0128] Table 4 shows the aspherical coefficients of the security monitoring lens 100 in Embodiment 2 of this application, as shown in Table 4:

[0129] Table 4

[0130] Face number A4 A6 A8 A10 A12 S1 -2.613E-03 -7.152E-05 1.171E-05 -3.772E-07 3.091E-09 S2 -3.675E-03 1.214E-03 -3.557E-04 6.600E-05 -4.447E-06 S3 -2.411E-03 -7.610E-04 1.871E-04 -3.684E-05 2.318E-06 S4 -8.657E-05 1.559E-04 -4.276E-05 6.229E-06 -2.835E-07 S5 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S6 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S7 -9.174E-03 1.352E-03 -1.826E-04 1.483E-05 -5.201E-07 S8 3.213E-04 3.536E-04 -7.951E-05 9.637E-07 5.524E-07 S9 -2.274E-03 -8.733E-05 6.272E-06 -6.614E-06 8.201E-07 S10 -3.415E-04 -7.463E-05 2.947E-05 -2.901E-06 1.230E-07

[0131] Among them, the non-curved surfaces of each lens of the security monitoring camera 100 satisfy the following:

[0132]

[0133] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the radius of curvature r in Table 3 above); k is the conic constant (given in Table 3 above); Ai is the in-th order correction coefficient of the aspherical surface, and the higher-order coefficients A4, A6, A8, A10, and A12 of each lens surface S1-S10 are shown in Table 4.

[0134] It should be understood that the aspherical surfaces of each lens in the security monitoring camera 100 can use the aspherical surface shown in the above aspherical surface formula, or other aspherical surface formulas, and this application does not limit them.

[0135] The above provides design data for the security monitoring lens 100 in Embodiment 2 of this application: effective focal length (EFL) is 4.328 mm, maximum field of view (Fov) is 104.874 degrees, total optical length (TTL) is 22.21 mm, and aperture (F.No.) is 1.602.

[0136] In one embodiment provided in this application, TTL / f-tan(Semi-Fov)=3.114.

[0137] In one embodiment provided in this application, f2 / EPD = 12.799.

[0138] In one embodiment provided in this application, F.No / ImgH = 0.485.

[0139] In one embodiment provided in this application, f234 / (CT2+CT3+CT4)=5.203.

[0140] In one embodiment provided in this application, (f-f1) / (f+f1)=-4.452.

[0141] In one embodiment provided in this application, (R41-R52) / f5 = 8.999.

[0142] In one embodiment provided in this application, EPD / (R11-R12) = 0.811.

[0143] In one embodiment provided in this application, f34 / (ET3+ET4)=-119.971.

[0144] In one embodiment provided in this application, TTL / (DT31+DT32) = 3.502.

[0145] In one embodiment provided in this application, (R51 / R52)×(SAG51 / SAG52)=0.912.

[0146] In one embodiment provided in this application, ET1 / CT1 = 1.610.

[0147] Figures 7 to 10 The optical performance of the security monitoring lens 100 designed with the lens combination method of Embodiment 2 is described.

[0148] In Example 2, the security monitoring lens meets the requirements of a wide field of view, small size, large aperture, large image area, and high imaging quality.

[0149] Example 3

[0150] One embodiment of this application's security monitoring lens 100 includes, from the object side to the image side, the following elements in sequence: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, as follows: Figure 11 As shown.

[0151] For ease of description, in the following embodiments, Stop represents the surface of the aperture stop, S1 represents the object-side surface of the first lens 11, S2 represents the image-side surface of the first lens 11, S3 represents the object-side surface of the second lens 12, S4 represents the image-side surface of the second lens 12, S5 represents the object-side surface of the third lens 13, S6 represents the image-side surface of the third lens 13, S7 represents the object-side surface of the fourth lens 14, S8 represents the image-side surface of the fourth lens 14, S9 represents the object-side surface of the fifth lens 15, S10 represents the image-side surface of the fifth lens 15, S11 represents the object-side surface of the filter, S12 represents the image-side surface of the filter, and S13 represents the imaging surface. The first lens 11 has negative optical power, and its object-side surface S1 is convex near the optical axis; its image-side surface S2 is concave near the optical axis. The second lens 12 has positive optical power, and its object-side surface S3 is concave near the optical axis; its image-side surface S4 is convex near the optical axis. The third lens 13 has positive optical power, and its object-side surface S5 is convex near the optical axis; its image-side surface S6 is convex near the optical axis. The fourth lens 14 has negative optical power, and its object-side surface S7 is convex near the optical axis; its image-side surface S8 is concave near the optical axis. The fifth lens 15 has positive optical power, and its object-side surface S9 is convex near the optical axis; its image-side surface S10 is convex near the optical axis.

[0152] Let TTL represent the total optical length of the security monitoring lens 100, ImgH represent the maximum image height of the security monitoring lens 100, and EFL represent the effective focal length of the security monitoring lens 100. Let αi represent the i-th order aspherical coefficient, i = 4, 6, 8, 10, 12, and K represent the conic coefficient.

[0153] Based on the above relationships, Table 5 shows the effective focal length (EFL), maximum field of view (Fov), total optical length (TTL), aperture (F.No.), surface type, radius of curvature, thickness, material refractive index, and conic coefficient of the security monitoring lens 100 in Embodiment 3. The units for radius of curvature and thickness are millimeters (mm), as shown in Table 5.

[0154] Table 5

[0155]

[0156]

[0157] Table 6 shows the aspherical coefficients of the security monitoring lens 100 in Embodiment 3 of this application, as shown in Table 6:

[0158] Table 6

[0159] Face number A4 A6 A8 A10 A12 S1 -2.411E-03 -1.907E-04 1.320E-05 -2.606E-07 9.778E-10 S2 -4.304E-03 2.920E-04 -3.136E-04 6.665E-05 -4.892E-06 S3 -2.408E-03 -7.490E-04 1.864E-04 -3.214E-05 2.244E-06 S4 1.494E-04 1.303E-04 -3.345E-05 5.802E-06 -2.924E-07 S5 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S6 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S7 -8.728E-03 1.302E-03 -1.805E-04 1.409E-05 -4.538E-07 S8 4.072E-04 3.298E-04 -7.348E-05 1.654E-06 2.013E-07 S9 -1.986E-03 -1.230E-04 1.745E-05 -6.594E-06 5.063E-07 S10 -6.833E-04 -9.879E-05 2.656E-05 -2.592E-06 1.122E-07

[0160] Among them, the non-curved surfaces of each lens of the security monitoring camera 100 satisfy the following:

[0161]

[0162] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the radius of curvature r in Table 5 above); k is the conic constant (given in Table 5 above); Ai is the in-th order correction coefficient of the aspherical surface, and the higher-order coefficients A4, A6, A8, A10, and A12 of each lens surface S1-S10 are shown in Table 6.

[0163] It should be understood that the aspherical surfaces of each lens in the security monitoring camera 100 can use the aspherical surface shown in the above aspherical surface formula, or other aspherical surface formulas, and this application does not limit them.

[0164] The above provides design data for the security monitoring lens 100 of Embodiment 3 of this application, which has an effective focal length (EFL) of 4.515mm, a maximum field of view (Fov) of 104.108 degrees, a total optical length (TTL) of 22.21mm, and an aperture (F.No.) of 1.611.

[0165] In one embodiment provided in this application, TTL / f-tan(Semi-Fov)=3.624.

[0166] In one embodiment provided in this application, f2 / EPD = 13.401.

[0167] In one embodiment provided in this application, F.No / ImgH = 0.487.

[0168] In one embodiment provided in this application, f234 / (CT2+CT3+CT4)=5.154.

[0169] In one embodiment provided in this application, (f-f1) / (f+f1)=-2.660.

[0170] In one embodiment provided in this application, (R41-R52) / f5 = 4.311.

[0171] In one embodiment provided in this application, EPD / (R11-R12) = 1.213.

[0172] In one embodiment provided in this application, f34 / (ET3+ET4)=-64.066.

[0173] In one embodiment provided in this application, TTL / (DT31+DT32) = 4.337.

[0174] In one embodiment provided in this application, (R51 / R52)×(SAG51 / SAG52)=0.682.

[0175] In one embodiment provided in this application, ET1 / CT1 = 1.034.

[0176] Figures 12 to 15 The optical performance of the security monitoring lens 100 designed with the lens combination method of Embodiment 3 is described.

[0177] In Example 3, the security monitoring lens meets the requirements of a wide field of view, small size, large aperture, large image area, and high imaging quality.

[0178] Example 4

[0179] One embodiment of this application's security monitoring lens 100 includes, from the object side to the image side, the following elements in sequence: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, as follows: Figure 16 As shown.

[0180] For ease of description, in the following embodiments, Stop represents the surface of the aperture stop, S1 represents the object-side surface of the first lens 11, S2 represents the image-side surface of the first lens 11, S3 represents the object-side surface of the second lens 12, S4 represents the image-side surface of the second lens 12, S5 represents the object-side surface of the third lens 13, S6 represents the image-side surface of the third lens 13, S7 represents the object-side surface of the fourth lens 14, S8 represents the image-side surface of the fourth lens 14, S9 represents the object-side surface of the fifth lens 15, S10 represents the image-side surface of the fifth lens 15, S11 represents the object-side surface of the filter, S12 represents the image-side surface of the filter, and S13 represents the imaging surface. The first lens 11 has negative optical power, and its object-side surface S1 is convex near the optical axis; its image-side surface S2 is concave near the optical axis. The second lens 12 has positive optical power, and its object-side surface S3 is concave near the optical axis; its image-side surface S4 is convex near the optical axis. The third lens 13 has positive optical power, and its object-side surface S5 is convex near the optical axis; its image-side surface S6 is convex near the optical axis. The fourth lens 14 has negative optical power, and its object-side surface S7 is convex near the optical axis; its image-side surface S8 is concave near the optical axis. The fifth lens 15 has positive optical power, and its object-side surface S9 is convex near the optical axis; its image-side surface S10 is convex near the optical axis.

[0181] Let TTL represent the total optical length of the security monitoring lens 100, ImgH represent the maximum image height of the security monitoring lens 100, and EFL represent the effective focal length of the security monitoring lens 100. Let αi represent the i-th order aspherical coefficient, i = 4, 6, 8, 10, 12, and K represent the conic coefficient.

[0182] Based on the above relationships, Table 7 shows the effective focal length (EFL), maximum field of view (Fov), total optical length (TTL), aperture (F.No.), surface type, radius of curvature, thickness, material refractive index, and conic coefficient of the security monitoring lens 100 in Embodiment 4. The units for radius of curvature and thickness are millimeters (mm), as shown in Table 7.

[0183] Table 7

[0184]

[0185]

[0186] Table 8 shows the aspherical coefficients of the security monitoring lens 100 in Embodiment 4 of this application, as shown in Table 8:

[0187] Table 8

[0188]

[0189] Among them, the non-curved surfaces of each lens of the security monitoring camera 100 satisfy the following:

[0190]

[0191] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the radius of curvature r in Table 7 above); k is the conic constant (given in Table 7 above); Ai is the in-th order correction coefficient of the aspherical surface, and the higher-order coefficients A4, A6, A8, A10, and A12 of each lens surface S1-S10 are shown in Table 8.

[0192] It should be understood that the aspherical surfaces of each lens in the security monitoring camera 100 can use the aspherical surface shown in the above aspherical surface formula, or other aspherical surface formulas, and this application does not limit them.

[0193] The above provides design data for the security monitoring lens 100 of Embodiment 4 of this application, with an effective focal length (EFL) of 4.203 mm, a maximum field of view (Fov) of 111.467 degrees, a total optical length (TTL) of 23.435 mm, and an aperture (F.No.) of 1.67.

[0194] In one embodiment provided in this application, TTL / f-tan(Semi-Fov)=4.108.

[0195] In one embodiment provided in this application, f2 / EPD = 12.800.

[0196] In one embodiment provided in this application, F.No / ImgH = 0.505.

[0197] In one embodiment provided in this application, f234 / (CT2+CT3+CT4)=5.201.

[0198] In one embodiment provided in this application, (f-f1) / (f+f1)=-3.692.

[0199] In one embodiment provided in this application, (R41-R52) / f5 = 4.810.

[0200] In one embodiment provided in this application, EPD / (R11-R12) = 0.782.

[0201] In one embodiment provided in this application, f34 / (ET3+ET4)=-17.274.

[0202] In one embodiment provided in this application, TTL / (DT31+DT32) = 4.598.

[0203] In one embodiment provided in this application, (R51 / R52)×(SAG51 / SAG52)=0.591.

[0204] In one embodiment provided in this application, ET1 / CT1 = 1.423.

[0205] Figures 17 to 20 The optical performance of the security monitoring lens 100 designed with the lens combination method of Embodiment 4 is described.

[0206] In Example 4, the security monitoring lens meets the requirements of a wide field of view, small size, large aperture, large image area, and high imaging quality.

[0207] Example 5

[0208] One embodiment of this application's security monitoring lens 100 includes, from the object side to the image side, the following elements in sequence: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, as follows: Figure 21 As shown.

[0209] For ease of description, in the following embodiments, Stop represents the surface of the aperture stop, S1 represents the object-side surface of the first lens 11, S2 represents the image-side surface of the first lens 11, S3 represents the object-side surface of the second lens 12, S4 represents the image-side surface of the second lens 12, S5 represents the object-side surface of the third lens 13, S6 represents the image-side surface of the third lens 13, S7 represents the object-side surface of the fourth lens 14, S8 represents the image-side surface of the fourth lens 14, S9 represents the object-side surface of the fifth lens 15, S10 represents the image-side surface of the fifth lens 15, S11 represents the object-side surface of the filter, S12 represents the image-side surface of the filter, and S13 represents the imaging surface. The first lens 11 has negative optical power, and its object-side surface S1 is convex near the optical axis; its image-side surface S2 is concave near the optical axis. The second lens 12 has positive optical power, and its object-side surface S3 is concave near the optical axis; its image-side surface S4 is convex near the optical axis. The third lens 13 has positive optical power, and its object-side surface S5 is convex near the optical axis; its image-side surface S6 is convex near the optical axis. The fourth lens 14 has negative optical power, and its object-side surface S7 is convex near the optical axis; its image-side surface S8 is concave near the optical axis. The fifth lens 15 has positive optical power, and its object-side surface S9 is convex near the optical axis; its image-side surface S10 is convex near the optical axis.

[0210] Let TTL represent the total optical length of the security monitoring lens 100, ImgH represent the maximum image height of the security monitoring lens 100, and EFL represent the effective focal length of the security monitoring lens 100. Let αi represent the i-th order aspherical coefficient, i = 4, 6, 8, 10, 12, and K represent the conic coefficient.

[0211] Based on the above relationships, Table 9 shows the effective focal length (EFL), maximum field of view (Fov), total optical length (TTL), aperture (F.No.), surface type, radius of curvature, thickness, material refractive index, and conic coefficient of the security monitoring lens 100 in Embodiment 5. The units for radius of curvature and thickness are millimeters (mm), as shown in Table 9.

[0212] Table 9

[0213]

[0214]

[0215] Table 10 shows the aspherical coefficients of the security monitoring lens 100 in Embodiment 5 of this application, as shown in Table 10:

[0216] Table 10

[0217] Face number A4 A6 A8 A10 A12 S1 -2.500E-03 -9.748E-05 1.142E-05 -3.670E-07 4.247E-09 S2 -4.754E-03 1.129E-03 -3.766E-04 7.044E-05 -4.420E-06 S3 -1.888E-03 -7.144E-04 2.154E-04 -3.524E-05 1.823E-06 S4 -8.897E-05 1.664E-04 -4.200E-05 5.890E-06 -3.144E-07 S5 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S6 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 S7 -9.216E-03 1.315E-03 -1.881E-04 1.457E-05 -4.818E-07 S8 4.141E-04 4.097E-04 -8.036E-05 -7.194E-07 4.470E-07 S9 -1.491E-03 -9.836E-05 7.060E-06 -6.823E-06 6.064E-07 S10 -4.367E-04 -1.182E-04 3.066E-05 -2.807E-06 1.353E-07

[0218] Among them, the non-curved surfaces of each lens of the security monitoring camera 100 satisfy the following:

[0219]

[0220] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the radius of curvature r in Table 9 above); k is the conic constant (given in Table 9 above); Ai is the in-th order correction coefficient of the aspherical surface, and the higher-order coefficients A4, A6, A8, A10, and A12 of each lens surface S1-S10 are shown in Table 10.

[0221] It should be understood that the aspherical surfaces of each lens in the security monitoring camera 100 can use the aspherical surface shown in the above aspherical surface formula, or other aspherical surface formulas, and this application does not limit them.

[0222] The above provides design data for the security monitoring lens 100 in Embodiment 5 of this application, with an effective focal length (EFL) of 4.169 mm, a maximum field of view (Fov) of 112.277 degrees, a total optical length (TTL) of 23.693 mm, and an aperture (F.No.) of 1.611.

[0223] In one embodiment provided in this application, TTL / f-tan(Semi-Fov)=4.193.

[0224] In one embodiment provided in this application, f2 / EPD = 14.2.

[0225] In one embodiment provided in this application, F.No / ImgH = 0.488.

[0226] In one embodiment provided in this application, f234 / (CT2+CT3+CT4)=4.168.

[0227] In one embodiment provided in this application, (f-f1) / (f+f1)=-3.286.

[0228] In one embodiment provided in this application, (R41-R52) / f5 = 4.296.

[0229] In one embodiment provided in this application, EPD / (R11-R12) = 0.829.

[0230] In one embodiment provided in this application, f34 / (ET3+ET4)=-112.486.

[0231] In one embodiment provided in this application, TTL / (DT31+DT32) = 4.764.

[0232] In one embodiment provided in this application, (R51 / R52)×(SAG51 / SAG52)=0.723.

[0233] In one embodiment provided in this application, ET1 / CT1 = 1.203.

[0234] Figures 22 to 25 The optical performance of the security monitoring lens 100 designed with the lens combination method of Embodiment 5 is described.

[0235] In Example 5, the security monitoring lens meets the requirements of a wide field of view, small size, large aperture, large image area, and high imaging quality.

[0236] In addition, the TTL / f-tan(Semi-Fov) values, f2 / EPD ratio, F.No / ImgH ratio, f234 / (CT2+CT3+CT4) ratio, (f-f1) / (f+f1) ratio, (R41-R52) / f5 ratio, EPD / (R11-R12) ratio, f34 / (ET3+ET4) ratio, TTL / (DT31+DT32) ratio, (R51 / R52)×(SAG51 / SAG52) value, and ET1 / CT1 ratio corresponding to Examples 1 to 5 are shown in Table 11:

[0237] Table 11

[0238] Conditional expression Example 1 Example 2 Example 3 Example 4 Example 5 TTL / f-tan(Semi-Fov) 3.784 3.114 3.624 4.108 4.193 f2 / EPD 12.799 12.799 13.401 12.800 14.200 F.No / ImgH 0.486 0.485 0.487 0.505 0.488 f234 / (CT2+CT3+CT4) 3.604 5.203 5.154 5.201 4.168 (f-f1) / (f+f1) -5.200 -4.452 -2.660 -3.692 -3.286 (R41-R52) / f5 4.373 8.999 4.311 4.810 4.296 EPD / (R11-R12) 0.599 0.811 1.213 0.782 0.829 f34 / (ET3+ET4) -83.503 -119.971 -64.066 -17.274 -112.486 TTL / (DT31+DT32) 4.192 3.502 4.337 4.598 4.764 (R51 / R52)×(SAG51 / SAG52) 0.685 0.912 0.682 0.591 0.723 ET1 / CT1 1.616 1.610 1.034 1.423 1.203

[0239] This invention has been described by way of preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. The invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of the invention.

Claims

1. A security monitoring lens characterized by, comprise, in order from the object side to the image side along the optical axis: a first lens with negative refractive power, whose image side surface is concave near the optical axis; a second lens with positive refractive power, whose object side surface is concave near the optical axis; a third lens with positive refractive power, whose image side surface is convex near the optical axis; a fourth lens with negative refractive power, whose image side surface is concave near the optical axis; a fifth lens with positive refractive power, whose object side surface is convex near the optical axis; the security monitoring lens satisfies the following conditional expressions: 3.114 < TTL / f - tan(Semi-Fov) < 4.193; 12.799 < f2 / EPD < 14.2; 0.485 < F.No / ImgH < 0.505; wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the security monitoring lens on the optical axis, f is the total effective focal length of the security monitoring lens; Semi-Fov is half of the maximum field angle of view of the security monitoring lens; F.No is the aperture F value of the security monitoring lens; ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the security monitoring lens; f2 is the effective focal length of the second lens; and EPD is the entrance pupil diameter of the security monitoring lens.

2. The security surveillance lens of claim 1, wherein, the security monitoring lens satisfies the following conditional expressions: 3.604 < f234 / (CT2+CT3+CT4) < 5.201; wherein f234 is the combined focal length of the second lens, the third lens and the fourth lens; CT2 is the central thickness of the second lens on the optical axis; CT3 is the central thickness of the third lens on the optical axis; and CT4 is the central thickness of the fourth lens on the optical axis.

3. The security surveillance lens of claim 1 or 2, wherein, the security monitoring lens satisfies the following conditional expressions: -5.2 < (f-f1) / (f+f1) < -2.66; wherein f is the total effective focal length of the security monitoring lens; and f1 is the effective focal length of the first lens.

4. The security surveillance lens of claim 3, wherein, the security monitoring lens satisfies the following conditional expressions: 4.311 < (R41-R52) / f5 < 8.999; wherein R41 is the curvature radius of the object side surface of the fourth lens; R52 is the curvature radius of the image side surface of the fifth lens; and f5 is the effective focal length of the fifth lens.

5. The security surveillance lens of claim 4, wherein, the security monitoring lens satisfies the following conditional expressions: 0.599 < EPD / (R11-R12) < 1.213; wherein EPD is the entrance pupil diameter of the security monitoring lens; R11 is the curvature radius of the object side surface of the first lens; and R12 is the curvature radius of the image side surface of the first lens.

6. The security surveillance lens of claim 4 or 5, wherein, the security monitoring lens satisfies the following conditional expressions: -119.971 < f34 / (ET3+ET4) < -17.274; wherein f34 is the combined focal length of the third lens and the fourth lens; ET3 is the edge thickness of the third lens; and ET4 is the edge thickness of the fourth lens.

7. The security surveillance lens of claim 6, wherein, the security monitoring lens satisfies the following conditional expressions: 3.502 < TTL / (DT31+DT32) < 4.764; Wherein, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the security surveillance lens; DT31 is the maximum effective half aperture of the object side surface of the third lens; DT32 is the maximum effective half aperture of the image side surface of the third lens.

8. The security surveillance lens of claim 1, wherein, The security surveillance lens satisfies the following conditional expression: 0.591 < (R51 / R52) x (SAG51 / SAG52) < 0.912; Wherein, R51 is the curvature radius of the object side surface of the fifth lens; R52 is the curvature radius of the image side surface of the fifth lens; SAG51 is the distance on the optical axis from the intersection of the object side surface of the fifth lens and the optical axis to the effective half aperture vertex of the object side surface of the fifth lens, and SAG52 is the distance on the optical axis from the intersection of the image side surface of the fifth lens and the optical axis to the effective half aperture vertex of the image side surface of the fifth lens.

9. The security surveillance lens of claim 8, wherein, The security surveillance lens satisfies the following conditional expression: 1.034 < ET1 / CT1 < 1.616; Wherein, ET1 is the edge thickness of the first lens; CT1 is the central thickness of the first lens on the optical axis.

10. A security monitoring lens module, characterized in that, The security surveillance lens as claimed in any one of claims 1 to 9.

Images