Security surveillance cameras and security surveillance camera modules

Abstract

The present invention discloses a security monitoring lens and a security monitoring lens module, belonging to the technical field of optical imaging. Along the optical axis, from the object side to the image side in sequence, it includes: a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a positive optical power. The security monitoring lens satisfies the following conditional expressions: 11.80 < (TTL / f) × Tan(Semi-Fov) < 14.20; -17.99 < f34 / f12 < -13.99. Constraining 11.8 < (TTL / f) × Tan(Semi-Fov) < 14.2 can take into account the wide-angle characteristics on the basis of meeting the requirements of shorter size and high imaging quality; satisfying -18 < f34 / f12 < -14 is beneficial to reducing the spherical aberration of the security monitoring lens and further improving the imaging quality of the security monitoring lens.

Description

Technical Field

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

[0002] In recent years, with the advancement of digital imaging technology, lenses have been widely used in the field of surveillance. As demand for surveillance lenses grows, so too do the requirements for imaging quality and production yield. Currently, wide-angle security surveillance lenses are large in size and have low imaging quality, making it difficult to achieve both. Therefore, it is necessary to design a security surveillance lens that meets these requirements. Summary of the Invention

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide a security monitoring lens and a security monitoring lens module that meet the requirements of shorter size, wide angle characteristics, and high imaging quality.

[0004] In a first aspect, a security surveillance lens includes:

[0005] The first lens has a negative optical power and its image-side surface is concave near the optical axis;

[0006] a second lens having positive refractive power and a concave object-side surface near the optical axis;

[0007] The third lens has positive refractive power and its image-side surface is convex near the optical axis;

[0008] a fourth lens element having negative refractive power, the image-side surface of which is concave near the optical axis;

[0009] a fifth lens element having positive refractive power, the object-side surface of which is convex near the optical axis;

[0010] The security monitoring lens meets the following conditions:

[0011] 11.80<(TTL / f)×Tan(Semi-Fov)<14.20;

[0012] -17.99 <f34 / f12<-13.99;

[0013] Wherein, TTL is the distance from the object side 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 of view of the security monitoring lens; f34 is the combined focal length of the third lens and the fourth lens; f12 is the combined focal length of the first lens and the second lens.

[0014] Optionally, the security monitoring lens satisfies the following conditional formula:

[0015] 0.78 <f / CT3<1.08;

[0016] Wherein, f is the total effective focal length of the security monitoring lens; CT3 is the center thickness of the third lens on the optical axis.

[0017] Optionally, the security monitoring lens satisfies the following conditional formula:

[0018] 3.59<(T12+CT2) / (T45+CT4)<9.29;

[0019] Among them, T12 is the air distance between the first lens and the second lens on the optical axis; CT2 is the center thickness of the second lens on the optical axis; CT4 is the center thickness of the fourth lens on the optical axis; T45 is the air distance between the fourth lens and the fifth lens on the optical axis.

[0020] Optionally, the security monitoring lens satisfies the following conditional formula:

[0021] 1.20 <EPD / CT1<2.68;

[0022] Among them, EPD is the entrance pupil diameter of the security monitoring lens; CT1 is the center thickness of the first lens on the optical axis.

[0023] Optionally, the security monitoring lens satisfies the following conditional formula:

[0024] 0.85 <ET3 / CT3<0.89;

[0025] Wherein, ET3 is the edge thickness of the third lens; CT3 is the center thickness of the third lens on the optical axis.

[0026] Optionally, the security monitoring lens satisfies the following conditional formula:

[0027] 61.98<|R42×f4| / CT4<168.00;

[0028] Among them, R42 is the curvature radius of the image side surface of the fourth lens; f4 is the effective focal length of the fourth lens, and CT4 is the center thickness of the fourth lens on the optical axis.

[0029] Optionally, the security monitoring lens satisfies the following conditional formula:

[0030] 1.47 <CT4 / (SAG42-SAG41)<3.81;

[0031] Where, CT4 is the central thickness of the fourth lens on the optical axis; SAG42 is the distance from the intersection of the image side of the fourth lens and the optical axis to the vertex of the effective radius of the image side of the fourth lens on the optical axis, and SAG41 is the distance from the intersection of the object side of the fourth lens and the optical axis to the vertex of the effective radius of the object side of the fourth lens on the optical axis.

[0032] Optionally, the security monitoring lens satisfies the following conditional formula:

[0033] 1.54 < ET3 / ET4 < 3.75;

[0034] Where, ET3 is the edge thickness of the third lens; ET4 is the edge thickness of the fourth lens.

[0035] Optionally, the security monitoring lens satisfies the following conditional formula:

[0036] {1.71 < CT3 / ET3 + CT4 / ET4 < 1.93}

[0037] Where, ET3 is the edge thickness of the third lens; CT3 is the central thickness of the third lens on the optical axis; ET4 is the edge thickness of the fourth lens; CT4 is the central thickness of the fourth lens on the optical axis.

[0038] In a second aspect, a security monitoring lens module is provided, including the security monitoring lens in any possible implementation manner in the first aspect.

[0039] The beneficial effects of the invention are as follows:

[0040] Constraining TTL / f within a reasonable range is beneficial to controlling the length of the security monitoring lens within a reasonable range; in addition, if the TTL / f ratio is too small, it will cause the lens length to be too small and the internal space of the lens to be too small, making it difficult to adjust the aberration and sensitivity of the optical system, resulting in low imaging quality. However, the security monitoring lens of the present application constrains TTL / f within a relatively large range, which is beneficial to avoiding the above defects and ensuring high-quality imaging of the security monitoring lens; on this basis, constraining Fov within a reasonable range is beneficial to taking into account the wide-angle characteristics while meeting the short-size characteristics and imaging quality; in summary, constraining {11.8 < (TTL / f) × Tan(Semi-Fov) < 14.2} takes into account the wide-angle characteristics while meeting the short size and high imaging quality;

[0041] Satisfying {- {18 < f34 / f12 < - 14}} reasonably distributes the combined focal lengths of the first lens and the second lens and the combined focal lengths of the fourth lens and the fourth lens, which is beneficial to reducing the spherical aberration of the security monitoring lens, further improving the imaging quality of the security monitoring lens, and also beneficial to reducing the sensitivity of the production process of the security monitoring lens and improving the yield of the production of the security monitoring lens;

[0042] Controlling the combined focal lengths of the first and second lenses, as well as the third and fourth lenses, within a reasonable range is also beneficial for correcting the variation in high and low temperature resolution, thereby ensuring the reliability and stability of the security monitoring lens performance under different temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 1 is a schematic structural diagram of a security monitoring lens according to the first embodiment of the present application;

[0044] Figures 2 to 5 The following are, in order, the spherical aberration curve diagram, astigmatism curve diagram, distortion diagram, and magnification chromatic aberration diagram of the security surveillance lens of Example 1 of the present application;

[0045] Figure 6 2 is a schematic structural diagram of a security monitoring lens according to the second embodiment of the present application;

[0046] Figures 7 to 10 The following are, in order, the spherical aberration curve diagram, astigmatism curve diagram, distortion diagram, and magnification chromatic aberration diagram of the security surveillance lens of Example 2 of the present application;

[0047] Figure 11 2 is a schematic structural diagram of a security monitoring lens according to the third embodiment of the present application;

[0048] Figures 12 to 15 The following are the spherical aberration curve, astigmatism curve, distortion diagram, and magnification chromatic aberration diagram of the security surveillance lens in Example 3 of the present application;

[0049] Figure 16 1 is a schematic structural diagram of a security monitoring lens according to a fourth embodiment of the present application;

[0050] Figures 17 to 20 The following are, in order, the spherical aberration curve diagram, astigmatism curve diagram, distortion diagram, and magnification chromatic aberration diagram of the security surveillance lens of Example 4 of the present application;

[0051] Figure 21 1 is a schematic structural diagram of a security monitoring lens according to a fifth embodiment of the present application;

[0052] Figures 22 to 25 The following are the spherical aberration curve diagram, astigmatism curve diagram, distortion diagram and magnification chromatic aberration diagram of the security monitoring lens of Example 5 of the present application.

[0053] In the figure: 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 DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0055] It should be noted that, for ease of understanding and description, the embodiments of the present application define the representation form of relevant parameters of the security monitoring lens. For example, TTL is used to represent the distance from the object side of the first lens to the imaging surface of the security monitoring lens on the optical axis; ImgH represents the maximum image height of the security monitoring lens. Similar defined letter representations are merely schematic and can of course be represented in other forms. This application does not impose any limitations.

[0056] It should also be noted that the units of the parameters involved in the ratio in the following relationship formula remain consistent. For example, the unit of the numerator is millimeter (mm), and the unit of the denominator is also millimeter (mm).

[0057] It should also be noted that the positive or negative value of the radius of curvature indicates whether the optical surface is convex toward the object side or convex toward the image side. When the optical surface (including the object side surface or the image side surface) is convex toward the object side, the radius of curvature of the optical surface is positive; when the optical surface (including the object side surface or the image side surface) is convex toward the image side, it is equivalent to the optical surface being concave toward the object side, and the radius of curvature of the optical surface is negative.

[0058] 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 surfaces in the accompanying drawings are merely illustrative and do not limit the embodiments of the present application. In the present application, the material of the lens can be resin, plastic, or glass. The lens includes spherical lenses and aspherical lenses. The lens can be a fixed focal length lens, a zoom lens, a standard lens, a short-focus lens, or a telephoto lens.

[0059] like Figure 1 As shown, the security surveillance lens 100 of the present embodiment comprises five lenses. For ease of description, the left side of the security surveillance lens 100 is defined as the object side (hereinafter referred to as the object side). The surface of the lens facing the object side is referred to as the object side surface, which can also be understood as the surface of the lens closest to the object side. The right side of the security surveillance lens 100 is defined as the image side (hereinafter referred to as the image side). The surface of the lens facing the image side is referred to as the image side surface, which can also be understood as the surface of the lens closest to the image side. From the object side to the image side, the security surveillance lens 100 of the present embodiment comprises, in order: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15. An aperture may be provided adjacent to the object side surface of the third lens 13. An image sensor 17, such as a CCD or CMOS, may be provided behind the fifth lens 15. A filter 16, such as a flat infrared cutoff filter, may also be provided between the fifth lens 15 and the image sensor 17. The security surveillance lens 100 is described in detail below.

[0060] refer to Figure 1 , Figure 1 The middle dashed line is used to represent the optical axis of the lens.

[0061] The security surveillance lens 100 of the embodiment of the present application includes, from the object side to the image side, the following components:

[0062] a first lens 11 , a second lens 12 , a third lens 13 , a fourth lens 14 , and a fifth lens 15 .

[0063] It should be understood that the above-mentioned “lenses of the security monitoring lens” refer to the lenses that make up the security monitoring lens, which in the embodiment of the present application are the first lens, the second lens, the third lens, the fourth lens, and the fifth lens.

[0064] Optionally, in the embodiment of the present application,

[0065] The first lens 11 may have negative optical power, and the object-side surface S1 of the first lens 11 is convex near the optical axis; the image-side surface S2 of the first lens 11 is concave near the optical axis;

[0066] The second lens 12 may have positive refractive power, the object-side surface S3 of the second lens 12 may be concave near the optical axis, and the image-side surface S4 of the second lens 12 may be convex near the optical axis;

[0067] The third lens 13 may have positive refractive power, the object-side surface S5 of the third lens 13 is convex near the optical axis, and the image-side surface S6 of the third lens 13 is convex near the optical axis;

[0068] The fourth lens element 14 may have negative optical power, the object-side surface S7 of the fourth lens element 14 is concave near the optical axis, and the image-side surface S8 of the fourth lens element 14 is concave near the optical axis.

[0069] The fifth lens element 15 may have positive refractive power. The object-side surface S9 of the fifth lens element 15 is convex near the optical axis, and the image-side surface S10 of the fifth lens element 15 is convex near the optical axis.

[0070] The security monitoring lens 100 satisfies the following relationship:

[0071] 11.80<(TTL / f)×Tan(Semi-Fov)<14.20;

[0072] -17.99 <f34 / f12<-13.99。

[0073] (TTL / f)×Tan(Semi-Fov) can be 11.852, 12.879, 11.807, 12.841, 14.202; Constraining TTL / f within a reasonable range is beneficial to controlling the length of the security monitoring lens within a reasonable range; In addition, if the TTL / f ratio is too small, the lens length will be too small and the internal space of the lens will be too small, making it difficult to adjust the aberration and sensitivity of the optical system, resulting in low imaging quality. However, the security monitoring lens of the present application constrains TTL / f within a relatively large range, which is beneficial to avoiding the above defects and ensuring high-quality imaging of the security monitoring lens; On this basis, constraining Fov within a reasonable range is beneficial to taking into account the wide-angle characteristics while meeting the short-size characteristics and imaging quality; In summary, constraining 11.8 < (TTL / f)×Tan(Semi-Fov) < 14.2 takes into account the wide-angle characteristics while meeting the short size and high imaging quality.

[0074] f34 / f12 can be -16.601, -16.779, -13.997, -17.991, -17.947. Satisfying -18 < f34 / f12 < -14 and reasonably distributing the combined focal lengths of the first lens and the second lens and the combined focal lengths of the third lens and the fourth lens is beneficial to reducing the spherical aberration of the security monitoring lens, further improving the imaging quality of the security monitoring lens, and is also beneficial to reducing the sensitivity of the production process of the security monitoring lens and improving the yield of the production of the security monitoring lens; Controlling the combined focal lengths of the first lens and the second lens and the combined focal lengths of the third lens and the fourth lens within a reasonable range is also beneficial to correcting the change amount of the high and low temperature resolution and meeting the reliability and stability of the performance of the security monitoring lens under different temperature conditions.

[0075] In some implementation manners of the first aspect, the security monitoring lens satisfies: 0.78 < f / CT3 < 1.08; f / CT3 can be 0.905, 0.937, 1.076, 0.974, 0.788; When the focal length is fixed, constraining the central thickness of the third lens within a reasonable range is beneficial to the reasonable distribution of the optical power of the third lens in space, beneficial to reducing the aberration of the security monitoring lens group, and also beneficial to improving the lateral chromatic aberration of the security monitoring lens and the resolution ability of the security monitoring lens, thereby improving the imaging quality of the security monitoring lens.

[0076] In certain implementations of the first aspect, the security monitoring lens satisfies: 3.59 < (T12 + CT2) / (T45 + CT4) < 9.29; (T12 + CT2) / (T45 + CT4) can be 7.912, 8.885, 8.558, 3.592, 9.285; reasonably controlling the spacing between the first lens and the second lens, the spacing between the fourth lens and the fifth lens, and the central thickness of the second lens and the fourth lens is beneficial to correcting system aberration, improving imaging resolution, and thus improving the imaging quality of the security monitoring lens; in addition, it can also make the spacing between the first lens and the second lens and between the fourth lens and the fifth lens of the security monitoring lens more reasonable, improving the convenience during the assembly of the security monitoring lens.

[0077] In certain implementations of the first aspect, the security monitoring lens satisfies: 1.20 < EPD / CT1 < 2.68; EPD / CT1 can be 2.675, 1.208, 1.383, 1.328, 1.552; when the above relationship is satisfied, it is beneficial to increase the entrance pupil diameter of the security monitoring lens, increase the light entering the security monitoring lens, improve the illuminance, and thus improve the imaging quality of the security monitoring lens; it is beneficial to achieve the wide-angle characteristic; in addition, it is also beneficial to avoid total internal reflection inside the first lens to generate stray light, reducing the possibility of generating stray light; it is also beneficial to improve the processing performance of the first lens.

[0078] In certain implementations of the first aspect, the security monitoring lens satisfies: 0.85 < ET3 / CT3 < 0.89; ET3 / CT3 can be 0.878, 0.877, 0.857, 0.873, 0.892; when the above relationship is satisfied, controlling the central thickness and edge thickness of the third lens within a reasonable range is beneficial to improving the processing performance of the third lens; in addition, it can avoid total internal reflection inside the third lens to generate stray light, reducing the possibility of generating stray light, and improving the imaging quality of the security monitoring lens.

[0079] In certain implementations of the first aspect, the security monitoring lens satisfies: 61.98 < |R42 × f4| / CT4 < 168.00; |R42 × f4| / CT4 can be 159.693, 168.00, 167.547, 61.983, 168.004; when the above relationship is satisfied, restricting |R42 × f4| within a reasonable range enables the light on the image side of the fourth lens to enter the object side of the fifth lens more effectively, which is beneficial to controlling the spherical aberration and astigmatism of the fourth lens and improving the imaging quality of the security monitoring lens; restricting |R42 × f4| / CT4 within a reasonable range, on the premise of ensuring the imaging quality, makes the central thickness of the fourth lens within a reasonable range, improving the processing performance and assembly convenience of the fourth lens, and improving the production efficiency of the security monitoring lens.

[0080] In some implementations of the first aspect, the security monitoring lens satisfies: 1.47 < CT4 / (SAG42 - SAG41) < 3.81; CT4 / (SAG42 - SAG41) can be 1.649, 1.560, 1.576, 3.811, 1.472; restricting the curvature radii of the object side and the image side of the fourth lens, and the central thickness of the fourth lens within a reasonable range is beneficial to improving the ghost images generated by the reflection of light between the fourth lens and the fifth lens.

[0081] In some implementations of the first aspect, the security monitoring lens satisfies: 1.54 < ET3 / ET4 < 3.75; ET3 / ET4 can be 3.038, 3.182, 2.709, 1.541, 3.746; when the above relational expression is satisfied, the edge thicknesses of the third lens and the fourth lens can be reasonably allocated, making it easy to injection mold these two lenses; in addition, the distortion contribution of each field of view of the security monitoring lens can be controlled within a reasonable range, which is beneficial to ensuring better imaging quality.

[0082] In some implementations of the first aspect, the security monitoring lens satisfies: 1.71 < CT3 / ET3 + CT4 / ET4 < 1.93; CT3 / ET3 + CT4 / ET4 can be 1.761, 1.749, 1.779, 1.937, 1.716; when the above relational expression is satisfied, the processing and assembly process performance of the third lens and the fourth lens can be improved, avoiding the problem of easy deformation during the processing and assembly due to the center and edges of the third lens and the fourth lens being too thin, and the resulting low imaging quality and low production yield of the lens group.

[0083] In the second aspect, a security monitoring lens module is provided, including 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.

[0084] Next, some specific but non-limiting examples of the embodiments of the present application will be described in Figures 1 to 25 more detail.

[0085] It should be noted that the embodiments of the present application do not specifically limit the materials of each lens of the security monitoring lens 100.

[0086] Embodiment 1

[0087] The security monitoring lens 100 of an embodiment of the present application sequentially includes from the object side to the image side: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15, as Figure 1 shown.

[0088] For convenience of description, in the following embodiments, Sto represents the surface of the aperture, 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 focal power, and the object-side surface S1 of the first lens 11 is convex near the optical axis; the image-side surface S2 of the first lens 11 is concave near the optical axis; the second lens 12 has positive focal power, the object-side surface S3 of the second lens 12 is concave near the optical axis, and the image-side surface S4 of the second lens 12 may be convex near the optical axis; the third lens 13 has positive focal power, the object-side surface S5 of the third lens 13 is convex near the optical axis, and the image-side surface S6 of the third lens 13 is convex near the optical axis; the fourth lens 14 has negative focal power, the object-side surface S7 of the fourth lens 14 is concave near the optical axis, and the image-side surface S8 of the fourth lens 14 is concave near the optical axis; the fifth lens 15 has positive focal 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.

[0089] TTL represents the total optical length of the security surveillance lens 100, ImgH represents the maximum image height of the security surveillance lens 100, and EFL represents the effective focal length of the security surveillance lens 100. αi represents the i-th order aspheric coefficient, where i = 4, 6, 8, 10, 12, 14, or 16, and K represents the cone coefficient.

[0090] Based on the above relationship, Table 1 shows the effective focal length EFL, maximum field of view Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and conic coefficient of the security surveillance lens 100 in Example 1, where the units of curvature radius and thickness are both millimeters (mm), as shown in Table 1:

[0091] Table 1

[0092]

[0093] Table 2 shows the aspheric coefficients of the security monitoring lens 100 according to the first embodiment of the present application, as shown in Table 2:

[0094] Table 2

[0095] Face number A4 A6 A8 A10 A12 A14 A16 S1 -5.296E-03 2.322E-04 1.847E-06 -4.790E-07 1.001E-08 3.134E-10 -1.099E-11 S2 -1.005E-02 6.240E-04 -1.904E-04 2.879E-05 -5.218E-06 5.467E-07 -4.171E-08 S3 9.925E-04 -2.958E-04 5.306E-06 -7.141E-07 -6.002E-08 -4.703E-08 -1.924E-10 S4 4.765E-04 1.371E-04 -9.105E-05 1.413E-05 5.322E-08 -1.794E-07 9.154E-09 S5 0.000E+00 0.000E+00 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 0.000E+00 0.000E+00 S7 -1.614E-03 5.212E-06 -3.764E-04 4.001E-05 5.658E-06 -1.480E-06 3.696E-08 S8 1.383E-03 -6.421E-05 -5.219E-05 -2.718E-05 1.270E-05 -1.616E-06 3.000E-08 S9 -1.337E-04 3.525E-04 2.907E-05 1.397E-05 -6.339E-07 -1.752E-07 1.307E-08 S10 -1.502E-02 2.586E-03 -3.389E-04 1.471E-05 7.524E-06 -1.179E-06 8.870E-08

[0096] The non-curved surfaces of the lenses of the camera optical lens 100 satisfy the following requirements:

[0097]

[0098] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the curvature radius r in Table 1 above); k is the conic constant (given in Table 1 above); Ai is the correction coefficient of the i-th order of the aspheric surface, and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are shown in Table 2.

[0099] It should be understood that the aspheric surface of each lens in the security monitoring lens 100 can use the aspheric surface shown in the above aspheric surface formula, or can use other aspheric surface formulas, which is not limited in this application.

[0100] The above gives the design data of the security surveillance lens 100 of the first embodiment of the present application, the effective focal length EFL is 3.183 mm, the maximum field of view Fov is 121.175 degrees, the total optical length TTL is 21.641 mm, and the aperture F value F.No is 2.065.

[0101] In one embodiment provided in the present application, (TTL / f)×Tan(Semi-Fov)=11.852.

[0102] In one embodiment provided in this application, f34 / f12=-16.601.

[0103] In one embodiment provided in this application, f / CT3=0.905.

[0104] In one embodiment provided herein, (T12+CT2) / (T45+CT4)=7.912.

[0105] In one embodiment provided in this application, EPD / CT1=2.675.

[0106] In one embodiment provided in this application, ET3 / CT3=0.878.

[0107] In one embodiment provided in the present application, |R42×f4| / CT4=159.693.

[0108] In one embodiment provided herein, CT4 / (SAG42-SAG41)=1.649.

[0109] In one embodiment provided in this application, ET3 / ET4=3.038.

[0110] In one embodiment provided in the present application, CT3 / ET3+CT4 / ET4=1.761.

[0111] Figures 2 to 5 The optical performance of the security monitoring lens 100 designed with the lens combination method of the first embodiment is described.

[0112] In the first embodiment, the security monitoring lens meets the requirements of short size, wide angle characteristics, and high imaging quality.

[0113] Example 2

[0114] The security monitoring lens 100 of one embodiment of the present application includes, from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15. Figure 6 shown.

[0115] For convenience of description, in the following embodiments, Sto represents the surface of the aperture, 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 focal power, and the object-side surface S1 of the first lens 11 is convex near the optical axis; the image-side surface S2 of the first lens 11 is concave near the optical axis; the second lens 12 has positive focal power, the object-side surface S3 of the second lens 12 is concave near the optical axis, and the image-side surface S4 of the second lens 12 may be convex near the optical axis; the third lens 13 has positive focal power, the object-side surface S5 of the third lens 13 is convex near the optical axis, and the image-side surface S6 of the third lens 13 is convex near the optical axis; the fourth lens 14 has negative focal power, the object-side surface S7 of the fourth lens 14 is concave near the optical axis, and the image-side surface S8 of the fourth lens 14 is concave near the optical axis; the fifth lens 15 has positive focal 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.

[0116] TTL represents the total optical length of the security surveillance lens 100, ImgH represents the maximum image height of the security surveillance lens 100, and EFL represents the effective focal length of the security surveillance lens 100. αi represents the i-th order aspheric coefficient, where i = 4, 6, 8, 10, 12, 14, or 16, and K represents the cone coefficient.

[0117] Based on the above relationship, Table 3 shows the effective focal length EFL, maximum field of view Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and conic coefficient of the security surveillance lens 100 in Example 2. The units of curvature radius and thickness are both millimeters (mm), as shown in Table 3:

[0118] Table 3

[0119]

[0120] Table 4 shows the aspheric coefficients of the security monitoring lens 100 according to the second embodiment of the present application, as shown in Table 4:

[0121] Table 4

[0122] Face number A4 A6 A8 A10 A12 A14 A16 S1 -5.212E-03 2.295E-04 1.782E-06 -4.806E-07 1.001E-08 3.133E-10 -1.129E-11 S2 -1.020E-02 1.846E-04 -1.545E-04 3.360E-05 -4.598E-06 5.847E-07 -4.037E-08 S3 9.755E-04 -3.093E-04 3.775E-06 -2.165E-07 1.016E-07 -2.432E-08 2.691E-09 S4 4.826E-04 1.433E-04 -9.195E-05 1.329E-05 -3.506E-08 -1.790E-07 1.472E-08 S5 0.000E+00 0.000E+00 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 0.000E+00 0.000E+00 S7 -1.625E-03 7.149E-06 -3.756E-04 4.038E-05 6.414E-06 -1.375E-06 -1.494E-07 S8 1.388E-03 -6.219E-05 -5.215E-05 -2.776E-05 1.228E-05 -1.714E-06 3.009E-08 S9 -1.407E-04 3.513E-04 2.991E-05 1.427E-05 -4.451E-07 -1.992E-07 -1.386E-09 S10 -1.501E-02 2.585E-03 -3.382E-04 1.443E-05 7.569E-06 -1.164E-06 8.734E-08

[0123] The non-curved surfaces of the lenses of the camera optical lens 100 satisfy the following requirements:

[0124]

[0125] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the curvature radius r in Table 3 above); k is the conic constant (given in Table 3 above); Ai is the correction coefficient of the i-th order of the aspheric surface, and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are shown in Table 4.

[0126] It should be understood that the aspheric surface of each lens in the security monitoring lens 100 can use the aspheric surface shown in the above aspheric surface formula, or can use other aspheric surface formulas, which is not limited in this application.

[0127] The above gives the design data of the security surveillance lens 100 of the second embodiment of the present application, the effective focal length EFL is 3.330 mm, the maximum field of view Fov is 125.554 degrees, the total optical length TTL is 22.432 mm, and the aperture F value F.No is 2.051.

[0128] In one embodiment provided in the present application, (TTL / f)×Tan(Semi-Fov)=12.879.

[0129] In one embodiment provided in this application, f34 / f12=-16.779.

[0130] In one embodiment provided in this application, f / CT3=0.937.

[0131] In one embodiment provided herein, (T12+CT2) / (T45+CT4)=8.885.

[0132] In one embodiment provided in this application, EPD / CT1=1.208.

[0133] In one embodiment provided in the present application, ET3 / CT3=0.877.

[0134] In one embodiment provided herein, |R42×f4| / CT4=168.00.

[0135] In one embodiment provided herein, CT4 / (SAG42-SAG41)=1.560.

[0136] In one embodiment provided in this application, ET3 / ET4=3.182.

[0137] In one embodiment provided in the present application, CT3 / ET3+CT4 / ET4=1.749.

[0138] Figures 7 to 10 The optical performance of the security monitoring lens 100 designed with the lens combination of the second embodiment is described.

[0139] In the second embodiment, the security monitoring lens meets the requirements of short size, wide angle characteristics, and high imaging quality.

[0140] Example 3

[0141] The security monitoring lens 100 of one embodiment of the present application includes, from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15. Figure 11 shown.

[0142] For convenience of description, in the following embodiments, Sto represents the surface of the aperture, 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 focal power, and the object-side surface S1 of the first lens 11 is convex near the optical axis; the image-side surface S2 of the first lens 11 is concave near the optical axis; the second lens 12 has positive focal power, the object-side surface S3 of the second lens 12 is concave near the optical axis, and the image-side surface S4 of the second lens 12 may be convex near the optical axis; the third lens 13 has positive focal power, the object-side surface S5 of the third lens 13 is convex near the optical axis, and the image-side surface S6 of the third lens 13 is convex near the optical axis; the fourth lens 14 has negative focal power, the object-side surface S7 of the fourth lens 14 is concave near the optical axis, and the image-side surface S8 of the fourth lens 14 is concave near the optical axis; the fifth lens 15 has positive focal 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.

[0143] TTL represents the total optical length of the security surveillance lens 100, ImgH represents the maximum image height of the security surveillance lens 100, and EFL represents the effective focal length of the security surveillance lens 100. αi represents the i-th order aspheric coefficient, where i = 4, 6, 8, 10, 12, 14, or 16, and K represents the cone coefficient.

[0144] Based on the above relationship, Table 5 shows the effective focal length EFL, maximum field of view Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and conic coefficient of the security surveillance lens 100 in Example 3, where the units of curvature radius and thickness are both millimeters (mm), as shown in Table 5:

[0145] Table 5

[0146]

[0147] Table 6 shows the aspheric coefficients of the security monitoring lens 100 according to the third embodiment of the present application, as shown in Table 6:

[0148] Table 6

[0149] Face number A4 A6 A8 A10 A12 A14 A16 S1 -5.171E-03 2.308E-04 1.744E-06 -4.840E-07 1.005E-08 3.114E-10 -1.111E-11 S2 -9.780E-03 3.953E-04 -1.794E-04 3.225E-05 -4.501E-06 6.013E-07 -3.611E-08 S3 8.756E-04 -3.271E-04 4.533E-06 1.247E-07 8.422E-08 -2.929E-08 2.053E-09 S4 4.877E-04 1.348E-04 -9.312E-05 1.383E-05 -6.346E-08 -1.727E-07 1.312E-08 S5 0.000E+00 0.000E+00 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 0.000E+00 0.000E+00 S7 -1.627E-03 1.116E-05 -3.634E-04 3.677E-05 6.960E-06 -1.146E-06 -8.298E-08 S8 1.392E-03 -5.614E-05 -5.266E-05 -2.818E-05 1.288E-05 -1.487E-06 -2.133E-08 S9 -1.645E-04 3.464E-04 3.062E-05 1.437E-05 -4.659E-07 -1.965E-07 9.209E-09 S10 -1.501E-02 2.590E-03 -3.358E-04 1.544E-05 7.508E-06 -1.144E-06 9.387E-08

[0150] The non-curved surfaces of the lenses of the camera optical lens 100 satisfy the following requirements:

[0151]

[0152] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the curvature radius r in Table 5 above); k is the conic constant (given in Table 5 above); Ai is the correction coefficient of the i-th order of the aspheric surface, and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are shown in Table 6.

[0153] It should be understood that the aspheric surface of each lens in the security monitoring lens 100 can use the aspheric surface shown in the above aspheric surface formula, or can use other aspheric surface formulas, which is not limited in this application.

[0154] The above gives the design data of the security monitoring lens 100 of the third embodiment of the present application, the effective focal length EFL is 3.350 mm, the maximum field of view Fov is 123.440 degrees, the total optical length TTL is 21.650 mm, and the aperture F value F.No is 2.053.

[0155] In one embodiment provided in the present application, (TTL / f)×Tan(Semi-Fov)=11.807.

[0156] In one embodiment provided in this application, f34 / f12=-13.997.

[0157] In one embodiment provided in this application, f / CT3=1.076.

[0158] In one embodiment provided herein, (T12+CT2) / (T45+CT4)=8.558.

[0159] In one embodiment provided in this application, EPD / CT1=1.383.

[0160] In one embodiment provided in this application, ET3 / CT3=0.857.

[0161] In one embodiment provided in the present application, |R42×f4| / CT4=167.547.

[0162] In one embodiment provided herein, CT4 / (SAG42-SAG41)=1.576.

[0163] In one embodiment provided in this application, ET3 / ET4=2.709.

[0164] In one embodiment provided herein, CT3 / ET3+CT4 / ET4=1.779.

[0165] Figures 12 to 15 The optical performance of the security monitoring lens 100 designed with the lens combination of the third embodiment is described.

[0166] In the third embodiment, the security monitoring lens meets the requirements of short size, wide angle characteristics, and high imaging quality.

[0167] Example 4

[0168] The security monitoring lens 100 of one embodiment of the present application includes, from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15. Figure 16 shown.

[0169] For convenience of description, in the following embodiments, Sto represents the surface of the aperture, 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 focal power, and the object-side surface S1 of the first lens 11 is convex near the optical axis; the image-side surface S2 of the first lens 11 is concave near the optical axis; the second lens 12 has positive focal power, the object-side surface S3 of the second lens 12 is concave near the optical axis, and the image-side surface S4 of the second lens 12 may be convex near the optical axis; the third lens 13 has positive focal power, the object-side surface S5 of the third lens 13 is convex near the optical axis, and the image-side surface S6 of the third lens 13 is convex near the optical axis; the fourth lens 14 has negative focal power, the object-side surface S7 of the fourth lens 14 is concave near the optical axis, and the image-side surface S8 of the fourth lens 14 is concave near the optical axis; the fifth lens 15 has positive focal 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.

[0170] TTL represents the total optical length of the security surveillance lens 100, ImgH represents the maximum image height of the security surveillance lens 100, and EFL represents the effective focal length of the security surveillance lens 100. αi represents the i-th order aspheric coefficient, where i = 4, 6, 8, 10, 12, 14, or 16, and K represents the cone coefficient.

[0171] Based on the above relationship, Table 7 shows the effective focal length EFL, maximum field of view Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index, and conic coefficient of the security surveillance lens 100 in Example 4. The units of curvature radius and thickness are both millimeters (mm), as shown in Table 7:

[0172] Table 7

[0173]

[0174] Table 8 shows the aspheric coefficients of the security monitoring lens 100 according to the fourth embodiment of the present application, as shown in Table 8:

[0175] Table 8

[0176]

[0177]

[0178] The non-curved surfaces of the lenses of the camera optical lens 100 satisfy the following requirements:

[0179]

[0180] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the curvature radius r in Table 7 above); k is the conic constant (given in Table 7 above); Ai is the correction coefficient of the i-th order of the aspheric surface, and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are shown in Table 8.

[0181] It should be understood that the aspheric surface of each lens in the security monitoring lens 100 can use the aspheric surface shown in the above aspheric surface formula, or can use other aspheric surface formulas, which is not limited in this application.

[0182] The above gives the design data of the security surveillance lens 100 of the fourth embodiment of the present application, the effective focal length EFL is 3.276mm, the maximum field of view Fov is 123.474 degrees, the total optical length TTL is 22.987mm, and the aperture F value F.No is 2.045.

[0183] In one embodiment provided in the present application, (TTL / f)×Tan(Semi-Fov)=12.841.

[0184] In one embodiment provided in this application, f34 / f12=-17.991.

[0185] In one embodiment provided in this application, f / CT3=0.974.

[0186] In one embodiment provided herein, (T12+CT2) / (T45+CT4)=3.592.

[0187] In one embodiment provided in this application, EPD / CT1=1.328.

[0188] In one embodiment provided in the present application, ET3 / CT3=0.873.

[0189] In one embodiment provided in the present application, |R42×f4| / CT4=61.983.

[0190] In one embodiment provided herein, CT4 / (SAG42-SAG41)=3.811.

[0191] In one embodiment provided in this application, ET3 / ET4=1.541.

[0192] In one embodiment provided in the present application, CT3 / ET3+CT4 / ET4=1.937.

[0193] Figures 17 to 20 The optical performance of the security monitoring lens 100 designed with the lens combination of the fourth embodiment is described.

[0194] In the fourth embodiment, the security monitoring lens meets the requirements of shorter size, wider angle characteristics, and higher imaging quality.

[0195] Example 5

[0196] The security monitoring lens 100 of one embodiment of the present application includes, from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15. Figure 21 shown.

[0197] For convenience of description, in the following embodiments, Sto represents the surface of the aperture, 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 focal power, and the object-side surface S1 of the first lens 11 is convex near the optical axis; the image-side surface S2 of the first lens 11 is concave near the optical axis; the second lens 12 has positive focal power, the object-side surface S3 of the second lens 12 is concave near the optical axis, and the image-side surface S4 of the second lens 12 may be convex near the optical axis; the third lens 13 has positive focal power, the object-side surface S5 of the third lens 13 is convex near the optical axis, and the image-side surface S6 of the third lens 13 is convex near the optical axis; the fourth lens 14 has negative focal power, the object-side surface S7 of the fourth lens 14 is concave near the optical axis, and the image-side surface S8 of the fourth lens 14 is concave near the optical axis; the fifth lens 15 has positive focal 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.

[0198] TTL represents the total optical length of the security surveillance lens 100, ImgH represents the maximum image height of the security surveillance lens 100, and EFL represents the effective focal length of the security surveillance lens 100. αi represents the i-th order aspheric coefficient, where i = 4, 6, 8, 10, 12, 14, or 16, and K represents the cone coefficient.

[0199] Based on the above relationship, Table 9 shows the effective focal length EFL, maximum field of view Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index, and conic coefficient of the security surveillance lens 100 in Example 5. The units of curvature radius and thickness are both millimeters (mm), as shown in Table 9:

[0200] Table 9

[0201]

[0202] Table 10 shows the aspheric coefficients of the security monitoring lens 100 according to the fifth embodiment of the present application, as shown in Table 10:

[0203] Table 10

[0204]

[0205]

[0206] The non-curved surfaces of the lenses of the camera optical lens 100 satisfy the following requirements:

[0207]

[0208] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / r (i.e., the paraxial curvature c is the reciprocal of the curvature radius r in Table 9 above); k is the conic constant (given in Table 9 above); Ai is the correction coefficient of the i-th order of the aspheric surface, and the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are shown in Table 10.

[0209] It should be understood that the aspheric surface of each lens in the security monitoring lens 100 can use the aspheric surface shown in the above aspheric surface formula, or can use other aspheric surface formulas, which is not limited in this application.

[0210] The design data of the security surveillance lens 100 according to the fifth embodiment of the present application are given above, including an effective focal length EFL of 3.195 mm, a maximum field of view Fov of 127.205 degrees, a total optical length TTL of 22.890 mm, and an aperture F value F.No of 2.052.

[0211] In one embodiment provided in the present application, (TTL / f)×Tan(Semi-Fov)=14.202.

[0212] In one embodiment provided in this application, f34 / f12=-17.947.

[0213] In one embodiment provided in this application, f / CT3=0.788.

[0214] In one embodiment provided herein, (T12+CT2) / (T45+CT4)=9.285.

[0215] In one embodiment provided in this application, EPD / CT1=1.552.

[0216] In one embodiment provided in this application, ET3 / CT3=0.892.

[0217] In one embodiment provided in the present application, |R42×f4| / CT4=168.004.

[0218] In one embodiment provided herein, CT4 / (SAG42-SAG41)=1.472.

[0219] In one embodiment provided in this application, ET3 / ET4=3.746.

[0220] In one embodiment provided in the present application, CT3 / ET3+CT4 / ET4=1.716.

[0221] Figures 22 to 25 The optical performance of the security monitoring lens 100 designed with the lens combination of the fifth embodiment is described.

[0222] In the fifth embodiment, the security monitoring lens meets the requirements of short size, wide angle characteristics, and high imaging quality.

[0223] In addition, the (TTL / f)×Tan(Semi-Fov) ratio, f34 / f12 ratio, f / CT3 ratio, (T12+CT2) / (T45+CT4) ratio, EPD / CT1 ratio, ET3 / CT3 ratio, |R42×f4| / CT4 ratio, CT4 / (SAG42-SAG41) ratio, ET3 / ET4 ratio, and |R42×f4| / CT4 ratio corresponding to Examples 1 to 5 are shown in Table 11:

[0224] Table 11

[0225] Conditional expression Example 1 Example 2 Example 3 Example 4 Example 5 (TTL / f)×Tan(Semi-Fov) 11.852 12.879 11.807 12.841 14.202 f34 / f12 -16.601 -16.779 -13.997 -17.991 -17.947 f / CT3 0.905 0.937 1.076 0.974 0.788 (T12+CT2) / (T45+CT4) 7.912 8.885 8.558 3.592 9.285 EPD / CT1 2.675 1.208 1.383 1.328 1.552 ET3 / CT3 0.878 0.877 0.857 0.873 0.892 |R42×f4| / CT4 159.693 168.000 167.547 61.983 168.004 CT4 / (SAG42-SAG41) 1.649 1.560 1.576 3.811 1.472 ET3 / ET4 3.038 3.182 2.709 1.541 3.746 CT3 / ET3+CT4 / ET4 1.761 1.749 1.779 1.937 1.716

[0226] The present invention is described through preferred embodiments. Those skilled in the art will appreciate that various modifications and equivalent substitutions may 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 of this application are intended to be protected by the invention.

Claims

1. A security monitoring lens, characterized in that: Included are arranged in order from the object side to the image side along the optical axis: The first lens has a negative optical power and its image-side surface is concave near the optical axis; a second lens having positive refractive power and a concave object-side surface near the optical axis; The third lens has positive refractive power and its image-side surface is convex near the optical axis; a fourth lens element having negative refractive power, the image-side surface of which is concave near the optical axis; a fifth lens element having positive refractive power, the object-side surface of which is convex near the optical axis; The number of lenses with optical power in the security monitoring lens is five; The security monitoring lens meets the following conditions: 11.80 <(TTL / f)×Tan(Semi-Fov)<14.20; -17.99 <f34 / f12<-13.99; Wherein, TTL is the distance from the object side 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 of view of the security monitoring lens; f34 is the combined focal length of the third lens and the fourth lens; f12 is the combined focal length of the first lens and the second lens.

2. The security monitoring lens according to claim 1, characterized in that: The security monitoring lens meets the following conditions: 0.78 <f / CT3<1.08; Wherein, f is the total effective focal length of the security monitoring lens; CT3 is the center thickness of the third lens on the optical axis.

3. The security monitoring lens according to claim 1 or 2, characterized in that: The security monitoring lens meets the following conditions: 3.59<(T12+CT2) / (T45+CT4)<9.29; Among them, T12 is the air distance between the first lens and the second lens on the optical axis; CT2 is the center thickness of the second lens on the optical axis; CT4 is the center thickness of the fourth lens on the optical axis; T45 is the air distance between the fourth lens and the fifth lens on the optical axis.

4. The security monitoring lens according to claim 3, characterized in that: The security monitoring lens meets the following conditions: 1.20 <EPD / CT1<2.68; Among them, EPD is the entrance pupil diameter of the security monitoring lens; CT1 is the center thickness of the first lens on the optical axis.

5. The security monitoring lens according to claim 4, characterized in that: The security monitoring lens meets the following conditions: 0.85 <ET3 / CT3<0.89; Wherein, ET3 is the edge thickness of the third lens; CT3 is the center thickness of the third lens on the optical axis.

6. The security monitoring lens according to claim 4 or 5, characterized in that: The security monitoring lens meets the following conditions: 61.98<|R42×f4| / CT4<168.00; Among them, R42 is the curvature radius of the image side surface of the fourth lens; f4 is the effective focal length of the fourth lens, and CT4 is the center thickness of the fourth lens on the optical axis.

7. The security monitoring lens according to claim 6, characterized in that: The security monitoring lens meets the following conditions: 1.47 <CT4 / (SAG42-SAG41)<3.81; Among them, CT4 is the center thickness of the fourth lens on the optical axis; SAG42 is the distance from the intersection of the image side surface of the fourth lens and the optical axis to the effective radius vertex of the image side surface of the fourth lens on the optical axis; SAG41 is the distance from the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens on the optical axis.

8. The security monitoring lens according to claim 1, characterized in that: The security monitoring lens meets the following conditions: 1.54 <ET3 / ET4<3.75; Wherein, ET3 is the edge thickness of the third lens; ET4 is the edge thickness of the fourth lens.

9. The security monitoring lens according to claim 8, characterized in that: The security monitoring lens meets the following conditions: 1.71 <CT3 / ET3+CT4 / ET4<1.93 Among them, ET3 is the edge thickness of the third lens; CT3 is the center thickness of the third lens on the optical axis; ET4 is the edge thickness of the fourth lens; CT4 is the center thickness of the fourth lens on the optical axis.

10. A security monitoring lens module, characterized in that: The invention comprises the security monitoring lens according to any one of claims 1 to 9.

Images