Imaging lens

Abstract

The present application discloses an imaging lens, which includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens and the fifth lens each have negative optical power; the second lens has positive or negative optical power; the fourth lens, the sixth lens, and the seventh lens each have positive optical power; and the third lens has positive optical power. The imaging lens has a maximum half field of view (HFOV) that satisfies 1.7 < tan(HFOV) < 2.5; and the number of lenses having optical power in the imaging lens is seven.

Description

[0001] Divisional application statement

[0002] This application is a divisional application of the Chinese invention patent application with the invention name “IMAGING LENS” and application number 201710353145.3 filed on May 18, 2017. Technical Field

[0003] The present invention relates to an imaging lens, and more particularly, to an imaging lens including seven lenses. Background Art

[0004] In recent years, with the advancement of science and technology, portable electronic products have gradually emerged, and portable electronic products with camera functions have become increasingly popular. Imaging lenses used in sports equipment such as automotive cameras, surveillance cameras, and drones are also trending towards higher pixels and wider angles. Furthermore, higher requirements are placed on lenses that can maintain stable performance under different temperature conditions.

[0005] Because glass lenses have a low coefficient of expansion and are less affected by temperature, all-glass lenses can be used to maintain stable performance under varying temperatures. However, all-glass lenses are expensive and difficult to miniaturize. Furthermore, the use of spherical lenses results in poor resolution, making them uneconomical.

[0006] Therefore, there is a need for a wide-angle and miniaturized imaging lens that can achieve high imaging quality within a large temperature range. Summary of the Invention

[0007] The technical solution provided in this application at least partially solves the technical problems mentioned above.

[0008] According to one aspect of the present application, an optical lens is provided, which has a maximum half field of view (HFOV) and includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens and the fifth lens both have negative optical power; the second lens has positive optical power or negative optical power; the fourth lens, the sixth lens, and the seventh lens all have positive optical power; the third lens has positive optical power; and the maximum half field of view (HFOV) satisfies 1.7 < tan(HFOV) < 2.5.

[0009] In one embodiment, the image-side surface of the second lens element may be a convex surface, and the object-side surface of the seventh lens element may be a convex surface.

[0010] In one embodiment, the third lens is a lens made of glass.

[0011] In one embodiment, the fourth lens and the fifth lens are cemented together to form a cemented lens.

[0012] In one embodiment, the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens may satisfy 1<f3 / f<1.5.

[0013] In one embodiment, the distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis and the total effective focal length f may satisfy 4.2<TTL / f<5.5.

[0014] In one embodiment, the effective focal length f4 of the fourth lens and the total effective focal length f may satisfy 1<f4 / f<1.7.

[0015] In one embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens may satisfy -1.15<f5 / f<0.

[0016] In one embodiment, a curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens may satisfy 0.6<R3 / R4≤1.4.

[0017] In one embodiment, a curvature radius R2 of the image-side surface of the first lens and an effective focal length f1 of the first lens may satisfy -0.6<R2 / f1<-0.2.

[0018] In the exemplary embodiments of the present application, by properly matching the optical powers of each lens, it is beneficial to effectively correct aberrations, etc. Furthermore, the maximum half field of view (HFOV) of the imaging lens is set to satisfy 1.7 < tan(HFOV) < 2.5, which can maximize the field of view of the lens while ensuring the lens's imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0020] Figure 1 1 shows a schematic structural diagram of an imaging lens according to Example 1 of the present application;

[0021] Figures 2A to 2D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 1 are shown respectively;

[0022] Figure 3 1 shows a schematic structural diagram of an imaging lens according to Example 2 of the present application;

[0023] Figures 4A to 4DThe axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 2 are shown respectively;

[0024] Figure 5 1 shows a schematic structural diagram of an imaging lens according to Example 3 of the present application;

[0025] 6A to 6D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 3 are shown respectively;

[0026] Figure 7 1 shows a schematic structural diagram of an imaging lens according to Example 4 of the present application;

[0027] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 4 are shown respectively;

[0028] Figure 9 1 shows a schematic structural diagram of an imaging lens according to Example 5 of the present application;

[0029] 10A to 10D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 5 are shown respectively;

[0030] Figure 11 1 shows a schematic structural diagram of an imaging lens according to Example 6 of the present application;

[0031] 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 6 are shown respectively;

[0032] Figure 13 1 shows a schematic structural diagram of an imaging lens according to Example 7 of the present application;

[0033] 14A to 14D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the imaging lens of Example 7 are shown respectively. DETAILED DESCRIPTION

[0034] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0036] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0037] In addition, the paraxial region refers to the region near the optical axis. In this article, the surface of each lens closest to the object is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface.

[0038] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, integers, steps, operations, elements, and / or parts, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0039] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] The features, principles and other aspects of the present application are described in detail below.

[0042] The imaging lens according to an exemplary embodiment of the present application includes, for example, seven lenses, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, arranged in order from the object side to the image side along the optical axis.

[0043] In an exemplary embodiment, the first lens may have negative optical power; the second lens may have positive optical power or negative optical power, and its image-side surface may be convex; the third lens may have positive optical power; the fourth lens may have positive optical power or negative optical power; the fifth lens may have negative optical power; the sixth lens may have positive optical power or negative optical power; and the seventh lens may have positive optical power or negative optical power, and its object-side surface may be convex.

[0044] The third lens can be a glass lens. Compared with plastic lenses, glass lenses have a smaller thermal expansion coefficient and are less affected by temperature. The third lens is made of glass, which can reduce the impact of temperature changes on imaging quality, thereby helping to improve the performance stability of the lens at different temperatures. The mixed use of glass lenses and plastic lenses is to correct the impact of temperature changes on the imaging quality of the lens. This requires that the effective focal length f3 of the third glass lens, which is mainly used for temperature correction, be equivalent to the total effective focal length f of the imaging lens. For example, the effective focal length f3 of the third lens and the total effective focal length f of the imaging lens can satisfy 1<f3 / f<1.5. More specifically, f3 and f can further satisfy 1.27≤f3 / f≤1.49.

[0045] The fourth lens and the fifth lens can be cemented together to form a cemented lens. As known to those skilled in the art, cemented lenses are used to minimize or eliminate chromatic aberration. The use of cemented lenses can improve image quality and reduce reflection loss of light energy, thereby enhancing image clarity. In this application, by introducing a cemented lens composed of the fourth lens and the fifth lens, the chromatic aberration of the system can be corrected, the tolerance sensitivity of the system can be reduced, and the imaging quality of the imaging lens can be improved. In addition, the use of a cemented lens composed of the fourth lens and the fifth lens can also simplify the assembly process during the lens manufacturing process, facilitating the mass production of lenses.

[0046] In practice, the optical power of each lens can be optimized. For example, the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens can satisfy -1.15<f5 / f<0. More specifically, f5 and f can further satisfy -1.07≤f5 / f≤-0.75.

[0047] In some embodiments, the fourth lens element may have positive refractive power. The effective focal length f4 of the fourth lens element and the total effective focal length f of the imaging lens may satisfy 1 < f4 / f < 1.7. More specifically, f4 and f may further satisfy 1.17 ≤ f4 / f ≤ 1.60. When f4 and f satisfy 1 < f4 / f < 1.7, the fourth lens element can provide a relatively short positive focal length while ensuring that the fourth lens element meets process performance requirements, thereby facilitating chromatic aberration correction.

[0048] The distance TTL (the distance between the object side of the first lens and the imaging plane of the imaging lens on the optical axis) and the total effective focal length f of the imaging lens can satisfy 4.2 < TTL / f < 5.5. More specifically, TTL and f can further satisfy 4.45 ≤ TTL / f ≤ 4.57. This helps ensure lens miniaturization while expanding the field of view, effectively correcting various aberrations, and improving imaging quality.

[0049] The maximum half field of view (HFOV) of the imaging lens can satisfy 1.7 < tan(HFOV) < 2.5. More specifically, the HFOV can further satisfy 1.85 ≤ tan(HFOV) ≤ 2.12. When the maximum half field of view (HFOV) of the imaging lens satisfies 1.7 < tan(HFOV) < 2.5, the lens can have the largest possible field of view while ensuring imaging quality.

[0050] Furthermore, the radii of curvature of the object-side and image-side surfaces of the second lens can be optimized. For example, the curvature radius R3 of the object-side surface of the second lens and the curvature radius R4 of the image-side surface of the second lens can satisfy 0.6<R3 / R4≤1.4. More specifically, R3 and R4 can further satisfy 0.62≤R3 / R4≤1.40. When the curvature radius R3 of the object-side surface of the second lens and the curvature radius R4 of the image-side surface of the second lens are similar in size, the imaging lens can have a longer focal length; at the same time, such a configuration is conducive to correcting aberrations.

[0051] To reduce the tolerance sensitivity of the first lens element and facilitate lens assembly, the curvature radius R2 of the image-side surface of the first lens element and the effective focal length f1 of the first lens element need to be properly configured. For example, the curvature radius R2 of the image-side surface of the first lens element and the effective focal length f1 of the first lens element can satisfy -0.6<R2 / f1<-0.2. More specifically, R2 and f1 can further satisfy -0.52≤R2 / f1≤-0.39.

[0052] As known to those skilled in the art, aspheric lenses have a preferred radius of curvature, thereby reducing distortion and astigmatism, thereby improving image quality. During use, for example, at least one of the object-side and image-side surfaces of the second, sixth, and / or seventh lens elements can be configured as an aspheric surface to further enhance the imaging quality of the lens.

[0053] In the embodiments of the present application, an aperture STO may be provided, for example, between the second lens and the third lens, to effectively constrict light entering the imaging lens, thereby improving the imaging quality of the lens. Those skilled in the art will appreciate that the aperture STO may be provided at other locations as needed, i.e., the placement of the aperture STO is not limited to the positions shown in the accompanying drawings.

[0054] The imaging lens according to the above-described embodiment of the present application can utilize multiple lenses, such as the seven lenses described above. By rationally allocating the focal power, surface shape, center thickness of each lens, and on-axis spacing between lenses, the imaging lens's field of view can be effectively expanded, the effects of temperature on the optical system can be reduced, lens miniaturization can be ensured, relative illumination can be increased, and imaging quality can be enhanced. The imaging lens described above is suitable for portable electronic products and can also be installed in sports equipment such as vehicle-mounted cameras, surveillance cameras, and drones.

[0055] However, those skilled in the art will appreciate that the number of lenses comprising the lens may be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments describe an imaging lens using seven lenses as an example, the imaging lens is not limited to including seven lenses. If desired, the imaging lens may also include other numbers of lenses.

[0056] Specific embodiments of imaging lenses applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0057] Example 1

[0058] The following reference Figures 1 to 2D An imaging lens according to Embodiment 1 of the present application will be described. Figure 1 A schematic structural diagram of an imaging lens according to Example 1 of the present application is shown.

[0059] like Figure 1 As shown, the imaging lens includes seven lenses L1-L7 arranged in sequence from the object side to the image side along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S8 and an image-side surface S9; the sixth lens L6 has an object-side surface S10 and an image-side surface S11; and the seventh lens L7 has an object-side surface S12 and an image-side surface S13. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. Optionally, the imaging lens may also include a filter L8 having an object-side surface S14 and an image-side surface S15. The imaging lens of this embodiment may also be provided with an aperture STO for light beam restriction to improve imaging quality. Light from the object sequentially passes through each surface S1 to S15 and is ultimately imaged on the imaging surface S16.

[0060] Table 1 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens of Example 1.

[0061]

[0062]

[0063] Table 1

[0064] As can be seen from Table 1, the curvature radius R3 of the object-side surface S3 of the second lens L2 and the curvature radius R4 of the image-side surface S4 of the second lens L2 satisfy R3 / R4=1.14.

[0065] This embodiment uses seven lenses as an example. By rationally allocating the focal length and surface shape of each lens, the field of view of the lens is effectively expanded, the total length of the lens is shortened, and the impact of temperature changes on imaging quality is corrected. At the same time, various aberrations are corrected to improve the resolution and imaging quality of the lens.

[0066] The aspheric surface shape x is defined by the following formula:

[0067]

[0068] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface 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 cone coefficient (given in Table 1 above); Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A76, A8 10 、A 12 、A 14 and A 16 .

[0069] Face number A4 A6 A8 A10 A12 A14 A16 S3 -7.2185E-03 1.2809E-04 3.2896E-06 -2.4476E-07 5.3992E-09 -5.2934E-11 1.9592E-13 S4 7.0105E-04 -3.3937E-04 1.2965E-03 -1.1875E-03 6.2973E-04 -1.7163E-04 1.8836E-05 S11 -2.1039E-02 5.1825E-03 -9.2174E-04 1.1284E-04 -8.6741E-06 3.7296E-07 -6.8288E-09 S12 -1.8843E-03 -6.8724E-04 7.1636E-05 -2.6597E-06 4.7938E-08 -4.2361E-10 1.4682E-12 S13 -1.1709E-03 -1.2110E-03 1.5168E-04 -9.3184E-06 3.3024E-07 -6.1337E-09 4.5550E-11

[0070] Table 2

[0071] Table 3 shown below shows the effective focal lengths f1 to f7 of each lens in Example 1, the total effective focal length f of the imaging lens, half the diagonal length ImgH of the effective pixel area on the imaging surface S16, the maximum half field of view HFOV of the imaging lens, and the distance TTL on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens.

[0072] parameter f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm) Numerical -4.89 34.82 4.82 4.90 -2.70 18.02 11.48 parameter f(mm) ImgH(mm) HFOV(°) TTL(mm) Numerical 3.50 4.08 64.75 16.01

[0073] Table 3

[0074] According to Table 3, the effective focal length f3 of the third lens L3 satisfies f3 / f = 1.37 relative to the total effective focal length f of the imaging lens; the effective focal length f4 of the fourth lens L4 satisfies f4 / f = 1.40 relative to the total effective focal length f of the imaging lens; the effective focal length f5 of the fifth lens L5 satisfies f5 / f = -0.77 relative to the total effective focal length f of the imaging lens; the distance TTL on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens satisfies TTL / f = 4.57 relative to the total effective focal length f of the imaging lens; and the maximum half field of view HFOV of the imaging lens satisfies tan(HFOV) = 2.12. Combining Tables 1 and 3, it can be seen that the radius of curvature R2 of the image-side surface S2 of the first lens L1 satisfies R2 / f1 = -0.52 relative to the effective focal length f1 of the first lens L1.

[0075] Figure 2A The axial chromatic aberration curve of the imaging lens of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 2B The astigmatism curve of the imaging lens of Example 1 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 2C The distortion curve of the imaging lens of Example 1 is shown, which represents the distortion magnitude value under different viewing angles. Figure 2D The chromatic aberration curve of the imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens. Figures 2A to 2D It can be seen that the imaging lens provided in Example 1 can achieve good imaging quality.

[0076] Example 2

[0077] The following reference Figures 3 to 4D The imaging lens according to Example 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted. Figure 3 A schematic structural diagram of an imaging lens according to embodiment 2 of the present application is shown.

[0078] like Figure 3As shown, the imaging lens includes seven lenses L1-L7 arranged in sequence from the object side to the image side along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S8 and an image-side surface S9; the sixth lens L6 has an object-side surface S10 and an image-side surface S11; and the seventh lens L7 has an object-side surface S12 and an image-side surface S13. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. Optionally, the imaging lens may also include a filter L8 having an object-side surface S14 and an image-side surface S15. The imaging lens of this embodiment may also be provided with an aperture STO for light beam restriction to improve imaging quality. Light from the object sequentially passes through each surface S1 to S15 and is ultimately imaged on the imaging surface S16.

[0079] Table 4 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens of Example 2. Table 5 shows the higher-order coefficients of each aspherical mirror surface in Example 2. Table 6 shows the effective focal lengths f1 to f7 of each lens of Example 2, the total effective focal length f of the imaging lens, half the diagonal length of the effective pixel area on the imaging surface S16 ImgH, the maximum half field of view HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0080] Face number Surface type Radius of curvature thickness Material Cone coefficient OBJ spherical surface endless endless S1 spherical surface 6.7778 0.7000 1.732 / 54.68 S2 spherical surface 2.2000 1.9923 S3 Aspheric -2.9506 0.9873 1.645 / 23.53 0.8231 S4 Aspheric -3.9251 0.0500 -0.5472 STO spherical surface endless 0.0500 S5 spherical surface 8.1043 1.3948 1.807 / 56.57 S6 spherical surface -8.1846 1.5763 S7 spherical surface 9.1370 2.5459 1.591 / 64.14 S8 spherical surface -3.0000 0.6000 1.853 / 23.78 S9 spherical surface -50.0000 0.1033 S10 Aspheric -27.6440 1.5467 1.546 / 56.11 0.0000 S11 Aspheric -5.2695 0.0500 0.0000 S12 Aspheric 3.7768 1.7966 1.546 / 56.11 0.0000 S13 Aspheric 4.1169 0.9363 0.0000 S14 spherical surface endless 0.8000 1.517 / 64.17 S15 spherical surface endless 0.8705 S16 spherical surface endless

[0081] Table 4

[0082] Face number A4 A6 A8 A10 A12 A14 A16 S3 4.8540E-03 1.6463E-03 -1.1453E-03 7.2924E-04 -1.8882E-04 7.3343E-06 3.8579E-06 S4 -8.1765E-05 -3.9458E-03 6.2793E-03 -5.6195E-03 2.7510E-03 -6.9738E-04 7.1459E-05 S10 8.2159E-03 -1.9622E-03 2.3361E-04 4.2219E-06 -4.7012E-06 5.0415E-07 -1.6583E-08 S11 4.3118E-03 -2.9069E-03 9.5921E-04 -1.7117E-04 1.8493E-05 -1.1614E-06 3.3243E-08 S12 -8.7381E-03 -2.1927E-03 5.6086E-04 -7.0974E-05 4.6112E-06 -1.4372E-07 9.9722E-10 S13 -7.1778E-03 -1.8328E-03 3.8218E-04 -3.9732E-05 2.1778E-06 -5.8846E-08 4.7272E-10

[0083] Table 5

[0084] parameter f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm) Numerical -4.76 -30.58 5.25 4.15 -3.76 11.64 29.22 parameter f(mm) ImgH(mm) HFOV(°) TTL(mm) Numerical 3.53 3.93 62.13 16.00

[0085] Table 6

[0086] Figure 4A The axial chromatic aberration curve of the imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 4B The astigmatism curve of the imaging lens of Example 2 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 4C The distortion curve of the imaging lens of Example 2 is shown, which represents the distortion magnitude value under different viewing angles. Figure 4D The chromatic aberration curve of the imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens. Figures 4A to 4D It can be seen that the imaging lens provided in Example 2 can achieve good imaging quality.

[0087] Example 3

[0088] The following reference Figures 5 to 6D An imaging lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an imaging lens according to Example 3 of the present application is shown.

[0089] like Figure 3 As shown, the imaging lens includes seven lenses L1-L7 arranged in sequence from the object side to the image side along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S8 and an image-side surface S9; the sixth lens L6 has an object-side surface S10 and an image-side surface S11; and the seventh lens L7 has an object-side surface S12 and an image-side surface S13. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. Optionally, the imaging lens may also include a filter L8 having an object-side surface S14 and an image-side surface S15. The imaging lens of this embodiment may also be provided with an aperture STO for light beam restriction to improve imaging quality. Light from the object sequentially passes through each surface S1 to S15 and is ultimately imaged on the imaging surface S16.

[0090] Table 7 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens of Example 3. Table 8 shows the higher-order coefficients of each aspherical mirror surface in Example 3. Table 9 shows the effective focal lengths f1 to f7 of each lens of Example 3, the total effective focal length f of the imaging lens, half the diagonal length of the effective pixel area on the imaging surface S16 ImgH, the maximum half field of view HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0091] Face number Surface type Radius of curvature thickness Material Cone coefficient OBJ spherical surface endless endless S1 spherical surface 7.1471 0.7000 1.732 / 54.68 S2 spherical surface 2.2000 1.8943 S3 Aspheric -6.0282 1.0277 1.645 / 23.53 4.9309 S4 Aspheric -5.7792 0.0500 -16.5598 STO spherical surface endless 0.5175 S5 spherical surface -100.0000 2.0872 1.807 / 56.57 S6 spherical surface -3.6456 0.6796 S7 spherical surface 11.3064 1.7840 1.591 / 64.14 S8 spherical surface -4.3122 0.6000 1.853 / 23.78 S9 spherical surface 8.6497 0.4447 S10 Aspheric -140.4317 1.4279 1.546 / 56.11 0.0000 S11 Aspheric -4.5269 0.6600 0.0000 S12 Aspheric 4.1120 1.0499 1.546 / 56.11 0.0000 S13 Aspheric 4.1918 1.1036 0.0000 S14 spherical surface endless 0.8000 1.517 / 64.17 S15 spherical surface endless 1.1734 S16 spherical surface endless

[0092] Table 7

[0093] Face number A4 A6 A8 A10 A12 A14 A16 S3 -5.0561E-04 9.7638E-04 1.5370E-05 8.8931E-05 -5.6889E-05 9.2825E-06 5.5438E-08 S4 -3.6858E-03 -6.6265E-03 1.8358E-02 -1.8972E-02 1.0668E-02 -3.1006E-03 3.6459E-04 S10 -7.5309E-04 -8.0633E-04 4.2678E-04 -1.0040E-04 1.6905E-05 -1.5260E-06 5.5919E-08 S11 -7.5478E-03 1.6779E-03 3.4018E-05 -7.1729E-05 1.5885E-05 -1.4080E-06 4.9413E-08 S12 -2.0693E-02 2.5172E-03 -2.0894E-04 1.0596E-05 -4.0189E-07 1.5042E-08 -4.7628E-10 S13 -1.6790E-02 8.1195E-04 7.2357E-05 -1.9613E-05 1.6479E-06 -6.4074E-08 8.6098E-10

[0094] Table 8

[0095] parameter f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm) Numerical -4.62 82.92 4.64 5.52 -3.30 8.54 70.07 parameter f(mm) ImgH(mm) HFOV(°) TTL(mm) Numerical 3.58 3.93 63.39 16.00

[0096] Table 9

[0097] Figure 6A The axial chromatic aberration curve of the imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 6B The astigmatism curve of the imaging lens of Example 3 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 6C The distortion curve of the imaging lens of Example 3 is shown, which represents the distortion magnitude value under different viewing angles. Figure 6D The chromatic aberration curve of the imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens. 6A to 6D It can be seen that the imaging lens provided in Example 3 can achieve good imaging quality.

[0098] Example 4

[0099] The following reference Figures 7 to 8D An imaging lens according to Embodiment 4 of the present application is described. Figure 7 A schematic structural diagram of an imaging lens according to Example 4 of the present application is shown.

[0100] like Figure 7 As shown, the imaging lens includes seven lenses L1-L7 arranged in sequence from the object side to the image side along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S8 and an image-side surface S9; the sixth lens L6 has an object-side surface S10 and an image-side surface S11; and the seventh lens L7 has an object-side surface S12 and an image-side surface S13. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. Optionally, the imaging lens may also include a filter L8 having an object-side surface S14 and an image-side surface S15. The imaging lens of this embodiment may also be provided with an aperture STO for light beam restriction to improve imaging quality. Light from the object sequentially passes through each surface S1 to S15 and is ultimately imaged on the imaging surface S16.

[0101] Table 10 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens of Example 4. Table 11 shows the higher-order coefficients of each aspherical mirror surface in Example 4. Table 12 shows the effective focal lengths f1 to f7 of each lens of Example 4, the total effective focal length f of the imaging lens, half the diagonal length of the effective pixel area on the imaging surface S16 ImgH, the maximum half field of view HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0102]

[0103]

[0104] Table 10

[0105] Face number A4 A6 A8 A10 A12 A14 A16 S3 -3.7359E-03 2.2151E-04 -7.1690E-05 5.3657E-06 -1.7279E-07 2.5998E-09 -1.5041E-11 S4 1.0883E-03 -1.9210E-03 3.3736E-03 -2.8032E-03 1.2696E-03 -2.9341E-04 2.7126E-05 S10 -9.9658E-03 -2.4312E-04 6.1825E-04 -3.0871E-04 6.9944E-05 -6.8443E-06 2.3970E-07 S11 -3.6737E-02 8.9341E-03 -1.9358E-03 3.1641E-04 -3.7066E-05 2.9148E-06 -1.0500E-07 S12 -6.8837E-03 6.3204E-04 -9.1429E-06 -5.0866E-07 1.8551E-08 -2.1768E-10 8.7413E-13 S13 -5.3574E-03 -5.8906E-04 1.6337E-04 -1.8267E-05 1.2421E-06 -4.5893E-08 6.8089E-10

[0106] Table 11

[0107] parameter f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm) Numerical -4.55 27.06 4.70 4.52 -2.65 130.86 8.26 parameter f(mm) ImgH(mm) HFOV(°) TTL(mm) Numerical 3.51 3.93 61.67 16.00

[0108] Table 12

[0109] Figure 8A The axial chromatic aberration curve of the imaging lens of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 8B The astigmatism curve of the imaging lens of Example 4 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 8C The distortion curve of the imaging lens of Example 4 is shown, which represents the distortion magnitude value under different viewing angles. Figure 8D The chromatic aberration curve of the imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens. Figures 8A to 8D It can be seen that the imaging lens provided in Example 4 can achieve good imaging quality.

[0110] Example 5

[0111] The following reference Figures 9 to 10D An imaging lens according to Embodiment 5 of the present application is described. Figure 9 A schematic structural diagram of an imaging lens according to Example 5 of the present application is shown.

[0112] like Figure 9As shown, the imaging lens includes seven lenses L1-L7 arranged in sequence from the object side to the image side along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S8 and an image-side surface S9; the sixth lens L6 has an object-side surface S10 and an image-side surface S11; and the seventh lens L7 has an object-side surface S12 and an image-side surface S13. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. Optionally, the imaging lens may also include a filter L8 having an object-side surface S14 and an image-side surface S15. The imaging lens of this embodiment may also be provided with an aperture STO for light beam restriction to improve imaging quality. Light from the object sequentially passes through each surface S1 to S15 and is ultimately imaged on the imaging surface S16.

[0113] Table 13 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens of Example 5. Table 14 shows the higher-order coefficients of each aspherical mirror surface in Example 5. Table 15 shows the effective focal lengths f1 to f7 of each lens of Example 5, the total effective focal length f of the imaging lens, half the diagonal length of the effective pixel area on the imaging surface S16 ImgH, the maximum half field of view HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0114] Face number Surface type Radius of curvature thickness Material Cone coefficient OBJ spherical surface endless endless S1 spherical surface 7.3301 0.7000 1.732 / 54.68 S2 spherical surface 2.2000 1.7220 S3 Aspheric -5.1829 2.0952 1.645 / 23.53 4.7612 S4 Aspheric -5.1020 0.0500 -1.0810 STO spherical surface endless 0.4614 S5 spherical surface 11.4212 1.6834 1.807 / 56.57 S6 spherical surface -5.0613 0.0500 S7 spherical surface 7.5904 1.7069 1.591 / 64.14 S8 spherical surface -3.7216 0.6000 1.853 / 23.78 S9 spherical surface 6.1133 0.9677 S10 Aspheric -10.4315 0.8871 1.546 / 56.11 0.0000 S11 Aspheric -4.0042 0.4397 0.0000 S12 Aspheric 14.1299 1.9387 1.546 / 56.11 11.2434 S13 Aspheric -300.0000 1.0099 -1.2218E+21 S14 spherical surface endless 0.8000 1.517 / 64.17 S15 spherical surface endless 0.8879 S16 spherical surface endless

[0115] Table 13

[0116]

[0117]

[0118] Table 14

[0119] parameter f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm) Numerical -4.56 45.48 4.55 4.48 -2.64 11.35 24.77 parameter f(mm) ImgH(mm) HFOV(°) TTL(mm) Numerical 3.54 3.93 62.14 16.00

[0120] Table 15

[0121] Figure 10A The axial chromatic aberration curve of the imaging lens of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 10B The astigmatism curve of the imaging lens of Example 5 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 10C The distortion curve of the imaging lens of Example 5 is shown, which represents the distortion magnitude value under different viewing angles. Figure 10DThe chromatic aberration curve of the imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens. 10A to 10D It can be seen that the imaging lens provided in Example 5 can achieve good imaging quality.

[0122] Example 6

[0123] The following reference Figures 11 to 12D An imaging lens according to Embodiment 6 of the present application is described. Figure 11 A schematic structural diagram of an imaging lens according to Example 6 of the present application is shown.

[0124] like Figure 11 As shown, the imaging lens includes seven lenses L1-L7 arranged in sequence from the object side to the image side along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S8 and an image-side surface S9; the sixth lens L6 has an object-side surface S10 and an image-side surface S11; and the seventh lens L7 has an object-side surface S12 and an image-side surface S13. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. Optionally, the imaging lens may also include a filter L8 having an object-side surface S14 and an image-side surface S15. The imaging lens of this embodiment may also be provided with an aperture STO for light beam restriction to improve imaging quality. Light from the object sequentially passes through each surface S1 to S15 and is ultimately imaged on the imaging surface S16.

[0125] Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of Example 6. Table 17 shows the higher-order coefficients of each aspherical mirror surface in Example 6. Table 18 shows the effective focal lengths f1 to f7 of each lens of Example 6, the total effective focal length f of the imaging lens, half the diagonal length of the effective pixel area on the imaging surface S16 ImgH, the maximum half field of view HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0126] Face number Surface type Radius of curvature thickness Material Cone coefficient OBJ spherical surface endless endless S1 spherical surface 8.3266 0.7000 1.546 / 56.11 S2 spherical surface 2.0758 1.8788 S3 Aspheric -3.5060 1.0134 1.645 / 23.53 1.6737 S4 Aspheric -3.9391 0.0500 -0.1677 STO spherical surface endless 0.0500 S5 spherical surface 9.4945 2.3870 1.807 / 56.57 S6 spherical surface -6.6890 0.8526 S7 spherical surface 22.5256 1.7345 1.591 / 64.14 S8 spherical surface -3.2636 0.6000 1.853 / 23.78 S9 spherical surface 33.2668 0.1387 S10 Aspheric -36.3604 1.7408 1.546 / 56.11 0.0000 S11 Aspheric -4.3233 0.0500 0.0000 S12 Aspheric 3.7887 1.9780 1.546 / 56.11 0.0000 S13 Aspheric 4.2481 1.0386 0.0000 S14 spherical surface endless 0.8000 1.517 / 64.17 S15 spherical surface endless 0.9876 S16 spherical surface endless

[0127] Table 16

[0128] Face number A4 A6 A8 A10 A12 A14 A16 S3 3.0495E-03 2.6078E-04 4.6653E-04 -3.5445E-04 2.0235E-04 -6.4637E-05 8.9457E-06 S4 -6.5201E-04 -3.2508E-03 4.9834E-03 -4.3441E-03 2.0560E-03 -5.0503E-04 5.0359E-05 S10 9.2204E-03 -2.5050E-03 5.6156E-04 -6.9412E-05 4.8289E-06 -1.4415E-07 7.8836E-10 S11 -2.7043E-03 1.1147E-03 -1.0369E-04 3.3831E-06 2.5011E-06 -3.8923E-07 1.8548E-08 S12 -1.5367E-02 1.7325E-03 -4.3983E-04 8.3974E-05 -9.6587E-06 5.8582E-07 -1.5030E-08 S13 -9.8408E-03 -5.9885E-04 1.6100E-04 -1.5981E-05 8.1788E-07 -2.3542E-08 2.4306E-10

[0129] Table 17

[0130] parameter f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm) Numerical -5.27 -595.82 5.20 4.95 -3.46 8.82 25.46 parameter f(mm) ImgH(mm) HFOV(°) TTL(mm) Numerical 3.57 3.93 62.32 16.00

[0131] Table 18

[0132] Figure 12A The axial chromatic aberration curve of the imaging lens of Example 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 12B The astigmatism curve of the imaging lens of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 12C The distortion curve of the imaging lens of Example 6 is shown, which represents the distortion magnitude value under different viewing angles. Figure 12D The chromatic aberration curve of the imaging lens of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens. 12A to 12D It can be seen that the imaging lens provided in Example 6 can achieve good imaging quality.

[0133] Example 7

[0134] The following reference Figures 13 to 14D An imaging lens according to Embodiment 7 of the present application is described. Figure 13 A schematic structural diagram of an imaging lens according to Example 7 of the present application is shown.

[0135] like Figure 13 As shown, the imaging lens includes seven lenses L1-L7 arranged in sequence from the object side to the image side along the optical axis. The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S8 and an image-side surface S9; the sixth lens L6 has an object-side surface S10 and an image-side surface S11; and the seventh lens L7 has an object-side surface S12 and an image-side surface S13. The fourth lens L4 and the fifth lens L5 are cemented together to form a cemented lens. Optionally, the imaging lens may also include a filter L8 having an object-side surface S14 and an image-side surface S15. The imaging lens of this embodiment may also be provided with an aperture STO for light beam restriction to improve imaging quality. Light from the object sequentially passes through each surface S1 to S15 and is ultimately imaged on the imaging surface S16.

[0136] Table 19 shows the surface type, curvature radius, thickness, material, and conic coefficient of each lens of the imaging lens of Example 7. Table 20 shows the higher-order coefficients of each aspherical mirror surface in Example 7. Table 21 shows the effective focal lengths f1 to f7 of each lens of Example 7, the total effective focal length f of the imaging lens, half the diagonal length of the effective pixel area on the imaging surface S16 ImgH, the maximum half field of view HFOV of the imaging lens, and the distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S16 of the imaging lens. The surface shape of each aspherical surface can be defined by formula (1) given in Example 1 above.

[0137]

[0138]

[0139] Table 19

[0140] Face number A4 A6 A8 A10 A12 A14 A16 S3 -1.4633E-03 3.6635E-03 -4.8602E-03 3.6316E-03 -1.4806E-03 3.1021E-04 -2.6059E-05 S4 -1.7348E-04 -1.8831E-03 3.3958E-03 -3.0964E-03 1.5379E-03 -3.8979E-04 3.9399E-05 S10 6.0460E-03 -1.7363E-03 4.3265E-04 -9.1468E-05 1.1913E-05 -7.9849E-07 2.1898E-08 S11 3.2575E-03 -3.6518E-04 2.8585E-04 -7.7251E-05 9.5967E-06 -5.5950E-07 1.3569E-08 S12 -1.1480E-02 5.1254E-04 6.6478E-05 -2.5333E-05 2.8635E-06 -1.4633E-07 2.7260E-09 S13 -1.3595E-02 6.0390E-04 5.7792E-05 -1.8978E-05 1.8753E-06 -8.6990E-08 1.5361E-09

[0141] Table 20

[0142] parameter f1(mm) f2(mm) f3(mm) f4(mm) f5(mm) f6(mm) f7(mm) Numerical -5.50 -28.48 4.58 5.74 -3.65 7.58 34.70 parameter f(mm) ImgH(mm) HFOV(°) TTL(mm) Numerical 3.60 3.93 63.91 16.00

[0143] Table 21

[0144] Figure 14A The axial chromatic aberration curve of the imaging lens of Example 7 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 14B The astigmatism curve of the imaging lens of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 14C The distortion curve of the imaging lens of Example 7 is shown, which represents the distortion magnitude value under different viewing angles. Figure 14D The chromatic aberration curve of the imaging lens of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging lens. 14A to 14D It can be seen that the imaging lens provided in Example 7 can achieve good imaging quality.

[0145] In summary, Examples 1 to 7 respectively satisfy the relationships shown in Table 22 below.

[0146]

[0147]

[0148] Table 22

[0149] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An imaging lens, comprising, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, characterized in that: The first lens and the fifth lens both have negative optical power, wherein the object-side surface of the first lens is convex and the image-side surface is concave; the object-side surface of the fifth lens is concave; The second lens has positive or negative optical power, an object-side surface thereof is concave, and an image-side surface thereof is convex; The fourth lens, the sixth lens, and the seventh lens all have positive refractive power, wherein the image-side surface of the fourth lens is convex, and the object-side surface of the seventh lens is convex; The third lens has positive refractive power and its image side surface is convex; The maximum half field of view HFOV of the imaging lens satisfies 1.85≤tan(HFOV)≤2.12; The effective focal length f3 of the third lens and the total effective focal length f of the imaging lens satisfy 1.27≤f3 / f<1.5; The effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens satisfy -1.07≤f5 / f≤-0.75; and The number of lenses having optical power of the imaging lens is seven.

2. The imaging lens according to claim 1, wherein: The third lens is a lens made of glass.

3. The imaging lens according to claim 2, wherein: The fourth lens and the fifth lens are cemented together to form a cemented lens.

4. The imaging lens according to claim 1, wherein: The effective focal length f4 of the fourth lens and the total effective focal length f of the imaging lens satisfy 1.17≤f4 / f≤1.

60.

5. The imaging lens according to claim 1, wherein: A distance TTL from the object-side surface of the first lens to the imaging surface of the imaging lens on the optical axis and a total effective focal length f of the imaging lens satisfy 4.45≤TTL / f≤4.

57.

6. The imaging lens according to claim 5, wherein: A curvature radius R3 of the object-side surface of the second lens and a curvature radius R4 of the image-side surface of the second lens satisfy 0.6<R3 / R4≤1.

4.

7. The imaging lens according to claim 6, wherein: A curvature radius R2 of the image-side surface of the first lens and an effective focal length f1 of the first lens satisfy -0.52≤R2 / f1≤-0.39.

Images