Infrared wide-angle lens and infrared wide-angle lens module

Abstract

The invention discloses an infrared wide-angle lens and an infrared wide-angle lens module, and belongs to the technical field of optical imaging, and the infrared wide-angle lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, the second lens has positive focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has positive focal power; the infrared wide-angle lens satisfies the following conditional expressions: 1.010 < = Tan (Semi-FOV) / (DT11 + DT12) < = 3.917; and ET3 / (SAG31-SAG32) is more than or equal to 0.737 and less than or equal to 0.826. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are combined and configured, so that more light rays can enter the infrared lens, the imaging surface of the infrared lens is ensured to have enough illumination, the field angle of the infrared lens is increased, and the large wide angle characteristic of the infrared lens is realized.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an infrared wide-angle lens and an infrared wide-angle lens module. Background Art

[0002] With the advancement of lens technology, the application scope of lenses is becoming wider and wider, and the types of lenses are also increasing. For example, in the fields of aerial photography, monitoring, vehicle-mounted, sweeping robots, etc., the application of infrared lenses has gradually become the mainstream of the market. Therefore, people have higher requirements for the imaging effect of infrared lenses, requiring a larger viewing angle range and higher imaging quality.

[0003] Based on this, the present invention proposes an infrared wide-angle lens that has a large image surface, a large field of view, and high imaging quality, so as to improve the user's new experience. Summary of the invention

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose an infrared wide-angle lens and a camera module that meet the requirements of a large image surface, a large field of view, and high imaging quality.

[0005] In a first aspect, an infrared wide-angle lens comprises:

[0006] A first lens having negative optical power; the image side surface of the first lens is concave near the optical axis;

[0007] A second lens having positive refractive power; its object side surface is convex near the optical axis; and its image side surface is concave near the optical axis;

[0008] The third lens has positive refractive power and its object side surface is convex near the optical axis;

[0009] a fourth lens element having positive refractive power, whose object-side surface is convex near the optical axis; and

[0010] A fifth lens having positive refractive power; its object side surface is concave near the optical axis; and its image side surface is convex near the optical axis;

[0011] The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical lenses;

[0012] The infrared wide-angle lens satisfies the following conditional formula:

[0013] 1.010≤Tan(Semi-FOV) / (DT11+DT12)≤3.917;

[0014] 0.737≤ET3 / (SAG31-SAG32)≤0.826;

[0015] Among them, Semi-Fov is half of the maximum field of view of the infrared lens; DT11 is the maximum effective radius of the object side of the first lens; DT12 is the maximum effective radius of the image side of the first lens; ET3 is the edge thickness of the third lens; SAG31 is the sag SG value of the object side of the third lens corresponding to the maximum field of view of the infrared lens; SAG32 is the sag SG value of the image side of the third lens corresponding to the maximum field of view of the infrared lens.

[0016] Optionally, the infrared wide-angle lens satisfies the following conditional formula:

[0017] 1.509≤∑CT / f≤2.120;

[0018] Wherein, ΣCT is the sum of the center thicknesses of all lenses in the optical imaging system; and f is the total effective focal length of the infrared lens.

[0019] Optionally, the infrared wide-angle lens satisfies the following conditional formula:

[0020] 0.791≤DT51 / DT52≤0.846;

[0021] Wherein, DT51 is the maximum effective radius of the object side surface of the fifth lens; DT52 is the maximum effective radius of the image side surface of the fifth lens.

[0022] Optionally, the infrared wide-angle lens satisfies the following conditional formula:

[0023] 10.001≤|f5 / (R51+R52)|≤40.000;

[0024] Among them, f5 is the effective focal length of the fifth lens; R51 is the curvature radius of the object side of the fifth lens; R52 is the curvature radius of the image side of the fifth lens.

[0025] Optionally, the infrared wide-angle lens satisfies the following conditional formula:

[0026] 0.455≤(ET1-ET5) / CT1≤1.999;

[0027] Wherein, ET1 is the edge thickness of the first lens; ET5 is the edge thickness of the fifth lens; and CT1 is the center thickness of the first lens on the optical axis.

[0028] Optionally, the infrared wide-angle lens satisfies the following conditional formula:

[0029] 100.001≤(f2+f3) / T23≤180.000;

[0030] Wherein, f2 is the effective focal length of the second lens; f3 is the effective focal length of the third lens; T23 is the air spacing distance between the second lens and the third lens on the optical axis.

[0031] Optionally, the infrared wide-angle lens satisfies the following conditional formula:

[0032] 4.998≤(R11+R12) / (SAG11+SAG12)≤29.998;

[0033] Among them, R11 is the curvature radius of the object side of the first lens; R12 is the curvature radius of the image side of the first lens; SAG11 is the vector height SG value of the object side of the first lens corresponding to the maximum field of view angle of the infrared lens; SAG12 is the vector height SG value of the image side of the first lens corresponding to the maximum field of view angle of the infrared lens.

[0034] Optionally, the infrared wide-angle lens satisfies the following conditional formula:

[0035] In a second aspect, an infrared wide-angle lens module is characterized by comprising an infrared wide-angle lens that has a large image surface, a large field of view, and high imaging quality.

[0036] The beneficial effects of the invention are:

[0037] By reasonably allocating the sum of the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens, and on this basis constraining the ratio of the tangent value of half of the maximum field angle of the infrared wide-angle lens to it to be controlled within a reasonable range, it is beneficial for more light to enter the infrared lens, ensuring that the imaging surface of the infrared lens has sufficient illumination, and meeting the imaging requirements of the large image surface of the infrared lens; at the same time, effectively controlling the curvature of the object side and the image side of the first lens is beneficial to increasing the field angle of the infrared lens and realizing the wide-angle characteristic of the infrared lens;

[0038] By reasonably allocating the difference between the sagittal SG value of the object side surface of the third lens corresponding to the maximum field of view angle of the infrared lens and the sagittal SG value of the image side surface of the third lens corresponding to the maximum field of view angle of the infrared lens, and on this basis constraining the ratio of the edge thickness of the third lens to the sagittal SG value to be within a reasonable range, it is beneficial to improve the stray light at both ends of the third lens, make the light smoother after being refracted by the first lens, and effectively reduce the stray light and ghosting generated by the system, thereby improving the imaging quality of the infrared lens.

[0039] Therefore, satisfying the above two conditions is conducive to achieving at least one of a large image surface, a large field of view, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1is a schematic structural diagram of an infrared wide-angle lens according to Embodiment 1 of the present application;

[0041] Figures 2 to 5 The following are, in order, a spherical aberration curve diagram, an astigmatism curve diagram, a distortion diagram, and a magnification chromatic aberration diagram of the infrared wide-angle lens of Example 1 of the present application;

[0042] Figure 6 is a schematic structural diagram of an infrared wide-angle lens according to Embodiment 2 of the present application;

[0043] Figures 7 to 10 The following are, in order, the spherical aberration curve diagram, the astigmatism curve diagram, the distortion diagram, and the magnification chromatic aberration diagram of the infrared wide-angle lens of the second embodiment of the present application;

[0044] Fig.11 is a schematic structural diagram of an infrared wide-angle lens according to Embodiment 3 of the present application;

[0045] Figures 12 to 15 The following are, in order, the spherical aberration curve diagram, the astigmatism curve diagram, the distortion diagram, and the magnification chromatic aberration diagram of the infrared wide-angle lens of the third embodiment of the present application;

[0046] Fig.16 is a schematic structural diagram of an infrared wide-angle lens according to a fourth embodiment of the present application;

[0047] Figures 17 to 20 The following are, in order, the spherical aberration curve diagram, the astigmatism curve diagram, the distortion diagram, and the magnification chromatic aberration diagram of the infrared wide-angle lens of the fourth embodiment of the present application;

[0048] Fig.21 is a schematic structural diagram of an infrared wide-angle lens according to Embodiment 5 of the present application;

[0049] Figure 22 to Figure 25 The following are, in order, the spherical aberration curve diagram, the astigmatism curve diagram, the distortion diagram and the magnification chromatic aberration diagram of the infrared wide-angle lens of Example 5 of the present application.

[0050] In the figure: 100, infrared wide-angle lens; 11, first lens; 12, second lens; 13, third lens; 14, fourth lens; 15, fifth lens; 16, filter; 17, image sensor. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0052] It should be noted that, for the convenience of understanding and description, the embodiments of the present application define the representation form of the relevant parameters of the infrared wide-angle lens. For example, TTL is used to represent the distance from the object side of the first lens to the imaging surface of the infrared wide-angle lens on the optical axis; ImgH represents the maximum image height of the infrared wide-angle lens. Similar defined letter representations are merely schematic and can certainly be represented in other forms. The present application does not impose any limitation thereto.

[0053] It should also be noted that the units of the parameters involving the ratio in the following relationship equations remain consistent. For example, the unit of the numerator is millimeter (mm), and the unit of the denominator is also millimeter (mm).

[0054] It should also be noted that the positive or negative value of the radius of curvature indicates that 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 a positive value; 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 a negative value.

[0055] It should also be noted that the shape of the lens, the degree of concave-convexity of the object side and the image side in the accompanying drawings are only schematic and do not impose any limitation on the embodiments of the present application. In the present application, the material of the lens can be resin, plastic, or glass. The lens includes a spherical lens and an aspherical lens. The lens can be a fixed focal length lens, a zoom lens, a standard lens, a short focus lens, or a telephoto lens.

[0056] like Figure 1 As shown, the infrared wide-angle lens 100 of the embodiment of the present application includes 5 lenses. For the convenience of description, the left side of the infrared wide-angle lens 100 is defined as the scene side (hereinafter also referred to as the object side), the surface of the lens facing the object side can be called the object side, and the object side can also be understood as the surface of the lens close to the object side, and the right side of the infrared wide-angle lens 100 is the image side (hereinafter also referred to as the image side), the surface of the lens facing the image side can be called the image side, and the image side can also be understood as the surface of the lens close to the image side. From the object side to the image side, the infrared wide-angle lens 100 of the embodiment of the present application includes: a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 from the object side to the image side; an aperture Stop can also be set on the first lens 11. An image sensor 17 such as CCD, CMOS, etc. can also be set behind the fifth lens 15. A filter 16, such as a flat infrared cut-off filter, can also be set between the fifth lens 15 and the image sensor 17. The infrared wide-angle lens 100 is described in detail below.

[0057] refer to Figure 1 , Figure 1 The dashed line is used to represent the optical axis of the lens.

[0058] The infrared wide-angle lens 100 of the embodiment of the present application includes, from the object side to the image side, the following components:

[0059] a first lens 11 , a second lens 12 , a third lens 13 , a fourth lens 14 , and a fifth lens 15 .

[0060] It should be understood that the above-mentioned “lenses of the infrared wide-angle lens” refer to the lenses that make up the infrared wide-angle 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.

[0061] Optionally, in the embodiments of the present application,

[0062] 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;

[0063] The second lens 12 may have positive refractive power, the object side surface S3 of the second lens 12 may be convex near the optical axis, and the image side surface S4 of the second lens 12 may be concave near the optical axis;

[0064] The third lens 13 may have positive refractive power, an object-side surface S5 of the third lens 13 is a convex surface near the optical axis, and an image-side surface S6 of the third lens 13 is a convex surface near the optical axis;

[0065] The fourth lens 14 may have positive refractive power, an object-side surface S7 of the fourth lens 14 is a convex surface near the optical axis, and an image-side surface S8 of the fourth lens 14 is a convex surface near the optical axis;

[0066] The fifth lens element 15 may have positive refractive power, the object-side surface S9 of the fifth lens element 15 is a concave surface near the optical axis, and the image-side surface S10 of the fifth lens element 15 is a convex surface near the optical axis.

[0067] The infrared wide-angle lens 100 satisfies the following relationship:

[0068] 1.010≤Tan(Semi-FOV) / (DT11+DT12)≤3.917;

[0069] 0.737≤ET3 / (SAG31-SAG32)≤0.826;

[0070] Tan(Semi-FOV) / (DT11+DT12) can be 1.010, 2.167, 2.399, 2.557, 3.917; by reasonably allocating the sum of the maximum effective radius of the object side of the first lens and the maximum effective radius of the image side of the first lens, on this basis, constraining the ratio of the tangent value of half of the maximum field of view of the infrared wide-angle lens to it to be controlled within a reasonable range, it is beneficial for more light to enter the infrared lens, ensuring that the imaging surface of the infrared lens has sufficient illumination to meet the imaging requirements of the large image surface of the infrared lens; at the same time, effectively controlling the curvature of the object side and the image side of the first lens is beneficial to increasing the field of view of the infrared lens and realizing the wide-angle characteristics of the infrared lens.

[0071] ET3 / (SAG31-SAG32) can be 0.737, 0.759, 0.785, 0.787, 0.826; by reasonably allocating the difference between the vector height SG value of the object side surface of the third lens corresponding to the maximum field of view angle of the infrared lens and the vector height SG value of the image side surface of the third lens corresponding to the maximum field of view angle of the infrared lens, and on this basis, constraining the ratio of the edge thickness of the third lens thereto within a reasonable range, it is beneficial to improve the stray light at both ends of the third lens, making the light smoother after being refracted through the first lens, which can effectively reduce the stray light and ghosting generated by the system, thereby improving the imaging quality of the infrared lens.

[0072] Therefore, satisfying the above two conditions is conducive to achieving at least one of a large image surface, a large field of view, and high imaging quality.

[0073] In certain implementations of the first aspect, the infrared wide-angle lens satisfies: 1.509≤∑CT / f≤2.120; ∑CT / f can be 1.509, 1.526, 1.926, 2.020, or 2.120; by reasonably allocating the ratio of the sum of the center thicknesses of all lenses in the optical imaging system to the total effective focal length of the infrared lens within a reasonable range, the system chromatic aberration of the infrared lens can be effectively corrected, and distortion and coma can be improved, which is beneficial to improving the resolution of the infrared lens and further improving the imaging quality.

[0074] In certain implementations of the first aspect, the infrared wide-angle lens satisfies: 0.791≤DT51 / DT52≤0.846; DT51 / DT52 can be 0.791, 0.797, 0.798, 0.836, 0.846; by reasonably allocating the ratio of the maximum effective radius of the object side surface of the fifth lens to the maximum effective radius of the image side surface of the fifth lens within a reasonable range, the optical effective range of the fifth lens can be effectively expanded, which is beneficial to increasing the field of view angle of the optical lens and meeting the large wide-angle characteristics of the optical lens.

[0075] In certain implementations of the first aspect, the infrared wide-angle lens satisfies: 10.001≤|f5 / (R51+R52)|≤40.000;

[0076] |f5 / (R51+R52)| can be 10.001, 13.430, 39.997, 40.000, 40.000; by reasonably allocating the sum of the radius of curvature of the object side surface of the fifth lens and the radius of curvature of the image side surface of the fifth lens, on this basis, constraining the absolute value of the ratio of the effective focal length of the fifth lens to the effective focal length of the fifth lens to be within a reasonable range, it is beneficial to control the contribution of the spherical aberration and astigmatism of the third lens and the fourth lens, and improve the imaging quality of the infrared lens; at the same time, the distortion of the infrared lens can be reduced, which is beneficial to improving the aberration and improving the resolution of the infrared lens.

[0077] In certain implementations of the first aspect, the infrared wide-angle lens satisfies: 0.455≤(ET1-ET5) / CT1≤1.999;

[0078] (ET1-ET5) / CT1 can be 0.455, 0.673, 0.921, 0.983, 1.999; by reasonably allocating the difference between the edge thickness of the first lens and the edge thickness of the fifth lens, and on this basis constraining the ratio of the edge thickness of the first lens to the center thickness of the first lens on the optical axis within a reasonable range, the processing difficulty of the first lens and the fifth lens can be reduced, and the difficulty of structural assembly of the fourth lens during production can be reduced, which is beneficial to improving the stability of the lens group structure, thereby improving the production yield of the infrared lens.

[0079] In certain implementations of the first aspect, the infrared wide-angle lens satisfies: 100.001≤(f2+f3) / T23≤180.000;

[0080] (f2+f3) / T23 can be 100.001, 134.311, 163.878, 164.600, 180.000; by reasonably allocating the sum of the effective focal length of the second lens and the effective focal length of the third lens, on this basis, constraining the ratio of the air spacing distance between the second lens and the third lens on the optical axis to be within a reasonable range, and reasonably controlling the distance between the lenses before and after the aperture, so that the light transition is smoother, it is beneficial to reduce the distortion of the infrared lens, reduce the stray light and ghost images of the infrared lens, and improve the imaging quality of the infrared lens.

[0081] In certain implementations of the first aspect, the infrared wide-angle lens satisfies: 4.998≤(R11+R12) / (SAG11+SAG12)≤29.998; (R11+R12) / (SAG11+SAG12) can be 4.998, 9.306, 11.263, 11.776, 29.998; by reasonably allocating the sum of the radius of curvature of the object side of the first lens and the radius of curvature of the image side of the first lens, and at the same time limiting the sum of the vector height SG value of the object side of the first lens corresponding to the maximum field of view of the infrared lens and the vector height SG value of the image side of the first lens corresponding to the maximum field of view of the infrared lens, on this basis, constraining the ratio of the two within a reasonable range, it is beneficial to better optimize the distortion of the infrared lens, correct the system chromatic aberration of the infrared lens, and improve the resolution of the infrared lens, thereby improving the imaging quality.

[0082] In a second aspect, an infrared wide-angle lens module is provided, comprising an infrared wide-angle 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 realize the camera function of the infrared wide-angle lens.

[0083] The following will be combined Figures 1 to 25 Some specific but non-limiting examples of the embodiments of the present application are described in more detail.

[0084] It should be noted that the embodiment of the present application does not specifically limit the material of each lens of the infrared wide-angle lens 100 .

[0085] Embodiment 1

[0086] The infrared wide-angle 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 1 shown.

[0087] For the convenience of description, in the following embodiments, Stop 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 convex near the optical axis, and the image side surface S4 of the second lens 12 may be concave 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 positive focal 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 convex near the optical axis; the fifth lens 15 has positive focal power, the object side surface S9 of the fifth lens 15 is concave near the optical axis, and the image side surface S10 of the fifth lens 15 is convex near the optical axis.

[0088] TTL represents the total optical length of the infrared wide-angle lens 100, ImgH represents the maximum image height of the infrared wide-angle lens 100, and EFL represents the effective focal length of the infrared wide-angle lens 100. Ai represents the correction coefficient of the in-th order of the aspheric surface, i=4, 6, 8, 10, 12, 14, 16, and k represents the cone coefficient.

[0089] According to the above relationship, Table 1 shows the effective focal length EFL, maximum field angle Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and cone coefficient of the infrared wide-angle lens 100 in Example 1, wherein the units of the curvature radius and thickness are both millimeters (mm), as shown in Table 1:

[0090] Table 1

[0091]

[0092] Table 2 shows the aspheric coefficients of the infrared wide-angle lens 100 according to the first embodiment of the present application, as shown in Table 2:

[0093] Table 2

[0094]

[0095] The non-curved surfaces of each lens of the infrared wide-angle camera lens 100 satisfy:

[0096]

[0097] 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 (that is, the paraxial curvature c is the reciprocal of the curvature radius r in Table 1 above); k is the cone coefficient (given in Table 1 above); Ai is the correction coefficient of the in-th order of the aspheric surface, and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are as shown in Table 2.

[0098] It should be understood that the aspheric surface of each lens in the infrared wide-angle lens 100 may use the aspheric surface shown in the above aspheric surface formula, or may use other aspheric surface formulas, which is not limited in the present application.

[0099] The design data of the infrared wide-angle lens 100 of the first embodiment of the present application are given above, the effective focal length EFL is 0.796 mm, the maximum field of view Fov is 126.015 degrees, the total optical length TTL is 3.621 mm, and the aperture F value F.No is 2.451.

[0100] In one embodiment provided in the present application, Tan(Semi-FOV) / (DT11+DT12)=1.010.

[0101] In one embodiment provided in the present application, ET3 / (SAG31-SAG32)=0.826.

[0102] In one embodiment provided in the present application, ΣCT / f=2.020.

[0103] In one embodiment provided in the present application, DT51 / DT52=0.846.

[0104] In one embodiment provided in the present application, |f5 / (R51+R52)|=40.000.

[0105] In one embodiment provided in the present application, (ET1-ET5) / CT1=0.673.

[0106] In one embodiment provided in the present application, (f2+f3) / T23=134.311.

[0107] In one embodiment provided in the present application, (R11+R12) / (SAG11+SAG12)=11.263.

[0108] Figures 2 to 5The optical performance of the infrared wide-angle lens 100 designed in the lens combination mode of the first embodiment is described.

[0109] In the first embodiment, the infrared wide-angle lens meets the requirements of large image surface, large field of view, and high imaging quality.

[0110] Embodiment 2

[0111] The infrared wide-angle 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.

[0112] For the convenience of description, in the following embodiments, Stop 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 convex near the optical axis, and the image side surface S4 of the second lens 12 may be concave 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 positive focal 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 convex near the optical axis; the fifth lens 15 has positive focal power, the object side surface S9 of the fifth lens 15 is concave near the optical axis, and the image side surface S10 of the fifth lens 15 is convex near the optical axis.

[0113] TTL represents the total optical length of the infrared wide-angle lens 100, ImgH represents the maximum image height of the infrared wide-angle lens 100, and EFL represents the effective focal length of the infrared wide-angle lens 100. Ai represents the correction coefficient of the in-th order of the aspheric surface, i=4, 6, 8, 10, 12, 14, 16, and k represents the cone coefficient.

[0114] According to the above relationship, Table 3 shows the effective focal length EFL, maximum field angle Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and cone coefficient of the infrared wide-angle lens 100 in Example 2, wherein the units of the curvature radius and thickness are both millimeters (mm), as shown in Table 3:

[0115] Table 3

[0116]

[0117] Table 4 shows the aspheric coefficients of the infrared wide-angle lens 100 of the second embodiment of the present application, as shown in Table 4:

[0118] Table 4

[0119]

[0120] The non-curved surfaces of each lens of the infrared wide-angle camera lens 100 satisfy:

[0121]

[0122] 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 (that is, the paraxial curvature c is the reciprocal of the curvature radius r in Table 3 above); k is the cone coefficient (given in Table 3 above); Ai is the correction coefficient of the in-th order of the aspheric surface, and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are as shown in Table 4.

[0123] It should be understood that the aspheric surface of each lens in the infrared wide-angle lens 100 may use the aspheric surface shown in the above aspheric surface formula, or may use other aspheric surface formulas, which is not limited in the present application.

[0124] The design data of the infrared wide-angle lens 100 of the second embodiment of the present application are given above, the effective focal length EFL is 0.821 mm, the maximum field angle Fov is 156.816 degrees, the total optical length TTL is 3.236 mm, and the aperture F value F.No is 2.500.

[0125] In one embodiment provided in the present application, Tan(Semi-FOV) / (DT11+DT12)=3.917.

[0126] In one embodiment provided in the present application, ET3 / (SAG31-SAG32)=0.787.

[0127] In one embodiment provided in the present application, ΣCT / f=1.509.

[0128] In one embodiment provided in the present application, DT51 / DT52=0.836.

[0129] In one embodiment provided in the present application, |f5 / (R51+R52)|=40.000.

[0130] In one embodiment provided in the present application, (ET1-ET5) / CT1=0.455.

[0131] In one embodiment provided in the present application, (f2+f3) / T23=164.600.

[0132] In one embodiment provided in the present application, (R11+R12) / (SAG11+SAG12)=4.998.

[0133] Figures 7 to 10 The optical performance of the infrared wide-angle lens 100 designed in the lens combination mode of the second embodiment is described.

[0134] In the second embodiment, the infrared wide-angle lens meets the requirements of large image plane, large field of view, and high imaging quality.

[0135] Embodiment 3

[0136] The infrared wide-angle 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. Fig.11 shown.

[0137] For the convenience of description, in the following embodiments, Stop 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 convex near the optical axis, and the image side surface S4 of the second lens 12 may be concave 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 positive focal 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 convex near the optical axis; the fifth lens 15 has positive focal power, the object side surface S9 of the fifth lens 15 is concave near the optical axis, and the image side surface S10 of the fifth lens 15 is convex near the optical axis.

[0138] TTL represents the total optical length of the infrared wide-angle lens 100, ImgH represents the maximum image height of the infrared wide-angle lens 100, and EFL represents the effective focal length of the infrared wide-angle lens 100. Ai represents the correction coefficient of the in-th order of the aspheric surface, i=4, 6, 8, 10, 12, 14, 16, and k represents the cone coefficient.

[0139] According to the above relationship, Table 5 shows the effective focal length EFL, maximum field angle Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and cone coefficient of the infrared wide-angle lens 100 in Example 3, wherein the units of the curvature radius and thickness are both millimeters (mm), as shown in Table 5:

[0140] Table 5

[0141]

[0142] Table 6 shows the aspheric coefficients of the infrared wide-angle lens 100 of the third embodiment of the present application, as shown in Table 6:

[0143] Table 6

[0144]

[0145]

[0146] The non-curved surfaces of each lens of the infrared wide-angle camera lens 100 satisfy:

[0147]

[0148] 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 (that is, the paraxial curvature c is the reciprocal of the curvature radius r in Table 5 above); k is the cone coefficient (given in Table 5 above); Ai is the correction coefficient of the in-th order of the aspheric surface, and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are as shown in Table 6.

[0149] It should be understood that the aspheric surface of each lens in the infrared wide-angle lens 100 may use the aspheric surface shown in the above aspheric surface formula, or may use other aspheric surface formulas, which is not limited in the present application.

[0150] The design data of the infrared wide-angle lens 100 of the third embodiment of the present application are given above, the effective focal length EFL is 0.774 mm, the maximum field of view Fov is 153.300 degrees, the total optical length TTL is 3.645 mm, and the aperture F value F.No is 2.405.

[0151] In one embodiment provided in the present application, Tan(Semi-FOV) / (DT11+DT12)=2.167.

[0152] In one embodiment provided in the present application, ET3 / (SAG31-SAG32)=0.759.

[0153] In one embodiment provided in the present application, ΣCT / f=2.120.

[0154] In one embodiment provided in the present application, DT51 / DT52=0.798.

[0155] In one embodiment provided in the present application, |f5 / (R51+R52)|=10.001.

[0156] In one embodiment provided in the present application, (ET1-ET5) / CT1=0.921.

[0157] In one embodiment provided in the present application, (f2+f3) / T23=163.878.

[0158] In one embodiment provided in the present application, (R11+R12) / (SAG11+SAG12)=11.776.

[0159] Figures 12 to 15 The optical performance of the infrared wide-angle lens 100 designed in the lens combination mode of the third embodiment is described.

[0160] In the third embodiment, the infrared wide-angle lens meets the requirements of large image surface, large field of view, and high imaging quality.

[0161] Embodiment 4

[0162] The infrared wide-angle 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. Fig.16 shown.

[0163] For the convenience of description, in the following embodiments, Stop 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 convex near the optical axis, and the image side surface S4 of the second lens 12 may be concave 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 positive focal 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 convex near the optical axis; the fifth lens 15 has positive focal power, the object side surface S9 of the fifth lens 15 is concave near the optical axis, and the image side surface S10 of the fifth lens 15 is convex near the optical axis.

[0164] TTL represents the total optical length of the infrared wide-angle lens 100, ImgH represents the maximum image height of the infrared wide-angle lens 100, and EFL represents the effective focal length of the infrared wide-angle lens 100. Ai represents the correction coefficient of the in-th order of the aspheric surface, i=4, 6, 8, 10, 12, 14, 16, and k represents the cone coefficient.

[0165] According to the above relationship, Table 7 shows the effective focal length EFL, maximum field angle Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and cone coefficient of the infrared wide-angle lens 100 in Example 4, wherein the units of the curvature radius and thickness are both millimeters (mm), as shown in Table 7:

[0166] Table 7

[0167]

[0168] Table 8 shows the aspheric coefficients of the infrared wide-angle lens 100 according to the fourth embodiment of the present application, as shown in Table 8:

[0169] Table 8

[0170] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.616E-02 -2.017E-02 -7.840E-03 -1.778E-04 1.864E-03 5.985E-04 -1.248E-04 S2 2.935E-01 -1.450E+00 1.063E+01 -4.935E+01 5.042E+02 -2.764E+03 3.955E+03 S3 -4.174E-01 -1.144E+00 -1.283E+01 -1.374E+01 2.938E+02 2.482E+02 -3.777E+03 S4 5.517E-01 5.388E+00 -3.570E+01 1.700E+03 -1.867E+04 5.750E+04 3.906E+05 S5 2.140E-01 -3.170E-01 8.542E+00 -5.582E+02 2.874E+03 3.958E+04 -2.325E+05 S6 3.541E-02 -3.145E+00 1.386E+01 5.183E+01 -5.802E+02 -4.686E+03 3.359E+04 S7 -6.709E-01 -1.039E+00 -1.861E+00 8.210E+00 3.490E+01 1.541E+02 -2.110E+02 S8 -7.053E-01 1.186E+00 -1.687E+01 4.860E+01 6.796E+01 -5.067E+02 1.115E+03 S9 -6.185E-01 8.354E-01 -1.072E+01 1.413E+01 2.561E+01 -5.376E+01 -4.126E+02 S10 4.786E-02 2.752E-01 -8.089E-01 -6.489E-01 -3.090E-01 -2.867E+00 -3.000E+00

[0171] The non-curved surfaces of each lens of the infrared wide-angle camera lens 100 satisfy:

[0172]

[0173] 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 (that is, the paraxial curvature c is the reciprocal of the curvature radius r in Table 7 above); k is the cone coefficient (given in Table 7 above); Ai is the correction coefficient of the in-th order of the aspheric surface, and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are as shown in Table 8.

[0174] It should be understood that the aspheric surface of each lens in the infrared wide-angle lens 100 may use the aspheric surface shown in the above aspheric surface formula, or may use other aspheric surface formulas, which is not limited in the present application.

[0175] The design data of the infrared wide-angle lens 100 of the fourth embodiment of the present application are given above, the effective focal length EFL is 0.745 mm, the maximum field of view Fov is 153.300 degrees, the total optical length TTL is 3.341 mm, and the aperture F value F.No is 2.519.

[0176] In one embodiment provided in the present application, Tan(Semi-FOV) / (DT11+DT12)=2.557.

[0177] In one embodiment provided in the present application, ET3 / (SAG31-SAG32)=0.785.

[0178] In one embodiment provided in the present application, ΣCT / f=1.526.

[0179] In one embodiment provided in the present application, DT51 / DT52=0.797.

[0180] In one embodiment provided in the present application, |f5 / (R51+R52)|=13.430.

[0181] In one embodiment provided in the present application, (ET1-ET5) / CT1=1.999.

[0182] In one embodiment provided in the present application, (f2+f3) / T23=180.000.

[0183] In one embodiment provided in the present application, (R11+R12) / (SAG11+SAG12)=9.306.

[0184] Figures 17 to 20 The optical performance of the infrared wide-angle lens 100 designed in the lens combination mode of the fourth embodiment is described.

[0185] In the fourth embodiment, the infrared wide-angle lens meets the requirements of large image plane, large field of view, and high imaging quality.

[0186] Embodiment 5

[0187] The infrared wide-angle 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. Fig.21 shown.

[0188] For the convenience of description, in the following embodiments, Stop 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 convex near the optical axis, and the image side surface S4 of the second lens 12 may be concave 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 positive focal 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 convex near the optical axis; the fifth lens 15 has positive focal power, the object side surface S9 of the fifth lens 15 is concave near the optical axis, and the image side surface S10 of the fifth lens 15 is convex near the optical axis.

[0189] TTL represents the total optical length of the infrared wide-angle lens 100, ImgH represents the maximum image height of the infrared wide-angle lens 100, and EFL represents the effective focal length of the infrared wide-angle lens 100. Ai represents the correction coefficient of the in-th order of the aspheric surface, i=4, 6, 8, 10, 12, 14, 16, and k represents the cone coefficient.

[0190] According to the above relationship, Table 9 shows the effective focal length EFL, maximum field angle Fov, total optical length TTL, aperture F value F.No, surface type, curvature radius, thickness, material refractive index and cone coefficient of the infrared wide-angle lens 100 in Example 5, wherein the units of the curvature radius and thickness are both millimeters (mm), as shown in Table 9:

[0191] Table 9

[0192]

[0193] Table 10 shows the aspheric coefficients of the infrared wide-angle lens 100 of the fifth embodiment of the present application, as shown in Table 10:

[0194] Table 10

[0195] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.451E-02 -1.189E-02 -1.057E-03 1.167E-03 5.401E-04 -4.245E-04 5.764E-05 S2 1.522E-01 -1.464E+00 9.211E+00 -5.790E+01 4.869E+02 -2.743E+03 4.473E+03 S3 -4.444E-01 -1.743E+00 -1.493E+01 5.615E+00 4.877E+02 6.880E+02 -7.396E+03 S4 4.833E-01 4.917E+00 -3.663E+01 1.724E+03 -1.828E+04 5.878E+04 3.635E+05 S5 2.030E-01 -3.579E-01 8.200E+00 -5.546E+02 2.888E+03 3.989E+04 -2.275E+05 S6 4.649E-02 -2.965E+00 1.471E+01 5.537E+01 -5.648E+02 -4.542E+03 3.494E+04 S7 -6.286E-01 -1.153E+00 -4.174E+00 -9.050E+00 -2.186E+01 9.844E+01 4.865E+02 S8 -7.720E-01 8.552E-01 -1.827E+01 4.695E+01 6.651E+01 -5.441E+02 7.886E+02 S9 -7.274E-01 6.612E-01 -1.090E+01 1.231E+01 1.898E+01 -2.952E+01 -4.637E+01 S10 7.070E-02 2.598E-01 -6.721E-01 -2.514E-01 4.966E-01 -1.247E+00 1.223E+00

[0196] The non-curved surfaces of each lens of the infrared wide-angle camera lens 100 satisfy:

[0197]

[0198] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / r (that is, the paraxial curvature c is the reciprocal of the curvature radius r in Table 9 above); k is the cone coefficient (given in Table 9 above); Ai is the correction coefficient of the in-th order of the aspherical surface, and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each lens surface S1-S10 are as shown in Table 10.

[0199] It should be understood that the aspheric surface of each lens in the infrared wide-angle lens 100 may use the aspheric surface shown in the above aspheric surface formula, or may use other aspheric surface formulas, which is not limited in the present application.

[0200] The design data of the infrared wide-angle lens 100 of the fifth embodiment of the present application are given above, the effective focal length EFL is 0.792 mm, the maximum field of view Fov is 153.325 degrees, the total optical length TTL is 3.546 mm, and the aperture F value F.No is 2.485.

[0201] In one embodiment provided in the present application, Tan(Semi-FOV) / (DT11+DT12)=2.399.

[0202] In one embodiment provided in the present application, ET3 / (SAG31-SAG32)=0.737.

[0203] In one embodiment provided in the present application, ΣCT / f=1.926.

[0204] In one embodiment provided in the present application, DT51 / DT52=0.791.

[0205] In one embodiment provided in the present application, |f5 / (R51+R52)|=39.997.

[0206] In one embodiment provided in the present application, (ET1-ET5) / CT1=0.983.

[0207] In one embodiment provided in the present application, (f2+f3) / T23=100.001.

[0208] In one embodiment provided in the present application, (R11+R12) / (SAG11+SAG12)=29.998.

[0209] Figure 22 to Figure 25The optical performance of the infrared wide-angle lens 100 designed in the lens combination mode of the fifth embodiment is described.

[0210] In the fifth embodiment, the infrared wide-angle lens meets the requirements of large image plane, large field of view, and high imaging quality.

[0211] In addition, the Tan(Semi-FOV) / (DT11+DT12) ratio, ET3 / (SAG31-SAG32) ratio, ∑CT / f ratio, DT51 / DT52 ratio, |f5 / (R51+R52)| ratio, (ET1-ET5) / CT1 ratio, (f2+f3) / T23 ratio, and (R11+R12) / (SAG11+SAG12) ratio corresponding to Embodiments 1 to 5 are shown in Table 11:

[0212] Table 11

[0213] Conditional expression Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Tan(Semi-FOV) / (DT11+DT12) 1.010 3.917 2.167 2.557 2.399 ET3 / (SAG31-SAG32) 0.826 0.787 0.759 0.785 0.737 ∑CT / f 2.020 1.509 2.120 1.526 1.926 DT51 / DT52 0.846 0.836 0.798 0.797 0.791 |f5 / (R51+R52)| 40.000 40.000 10.001 13.430 39.997 (ET1-ET5) / CT1 0.673 0.455 0.921 1.999 0.983 (f2+f3) / T23 134.311 164.600 163.878 180.000 100.001 (R11+R12) / (SAG11+SAG12) 11.263 4.998 11.776 9.306 29.998

[0214] The present invention is described by preferred embodiments. Those skilled in the art will appreciate that various changes or 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, and other embodiments falling within the claims of this application are within the scope of protection of the invention.

Claims

1. An infrared wide-angle lens, characterized in that: Along the optical axis from the object side to the image side, they include: A first lens having negative optical power; the image side surface of the first lens is concave near the optical axis; A second lens having positive refractive power; its object side surface is convex near the optical axis; and its image side surface is concave near the optical axis; The third lens has positive refractive power and its object side surface is convex near the optical axis; a fourth lens element having positive refractive power, whose object-side surface is convex near the optical axis; and A fifth lens having positive refractive power; its object side surface is concave near the optical axis; and its image side surface is convex near the optical axis; The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspherical lenses; The infrared wide-angle lens satisfies the following conditional formula: 1.010≤Tan(Semi-FOV) / (DT11+DT12)≤3.917; 0.737≤ET3 / (SAG31-SAG32)≤0.826; Among them, Semi-Fov is half of the maximum field of view of the infrared lens; DT11 is the maximum effective radius of the object side of the first lens; DT12 is the maximum effective radius of the image side of the first lens; ET3 is the edge thickness of the third lens; SAG31 is the sag SG value of the object side of the third lens corresponding to the maximum field of view of the infrared lens; SAG32 is the sag SG value of the image side of the third lens corresponding to the maximum field of view of the infrared lens.

2. The infrared wide-angle lens according to claim 1, characterized in that: The infrared wide-angle lens satisfies the following conditional formula: 1.509≤∑CT / f≤2.120; Wherein, ΣCT is the sum of the center thicknesses of all lenses in the optical imaging system; and f is the total effective focal length of the infrared lens.

3. The infrared wide-angle lens according to claim 1, characterized in that: The infrared wide-angle lens satisfies the following conditional formula: 0.791≤DT51 / DT52≤0.846; Wherein, DT51 is the maximum effective radius of the object side surface of the fifth lens; DT52 is the maximum effective radius of the image side surface of the fifth lens.

4. The infrared wide-angle lens according to claim 1, characterized in that: The infrared wide-angle lens satisfies the following conditional formula: 10.001≤|f5 / (R51+R52)|≤40.000; Among them, f5 is the effective focal length of the fifth lens; R51 is the curvature radius of the object side of the fifth lens; R52 is the curvature radius of the image side of the fifth lens.

5. The infrared wide-angle lens according to claim 1, characterized in that: The infrared wide-angle lens satisfies the following conditional formula: 0.455≤(ET1-ET5) / CT1≤1.999; Wherein, ET1 is the edge thickness of the first lens; ET5 is the edge thickness of the fifth lens; and CT1 is the center thickness of the first lens on the optical axis.

6. The infrared wide-angle lens according to claim 1, characterized in that: The infrared wide-angle lens satisfies the following conditional formula: 100.001≤(f2+f3) / T23≤180.000; Wherein, f2 is the effective focal length of the second lens; f3 is the effective focal length of the third lens; T23 is the air spacing distance between the second lens and the third lens on the optical axis.

7. The infrared wide-angle lens according to claim 1, characterized in that: The infrared wide-angle lens satisfies the following conditional formula: 4.998≤(R11+R12) / (SAG11+SAG12)≤29.998; Among them, R11 is the curvature radius of the object side of the first lens; R12 is the curvature radius of the image side of the first lens; SAG11 is the vector height SG value of the object side of the first lens corresponding to the maximum field of view angle of the infrared lens; SAG12 is the vector height SG value of the image side of the first lens corresponding to the maximum field of view angle of the infrared lens.

8. An infrared wide-angle lens module, characterized in that: It comprises the infrared wide-angle lens as claimed in any one of claims 1 to 7.

Images