Imaging lens

Abstract

The application provides an imaging lens. The imaging lens comprises a lens barrel and a lens group. The lens barrel comprises an object side end surface, an image side end surface, an outer annular surface and an inner annular surface. The aperture diameter of the inner annular surface gradually increases from the object side to the image side. The lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. At least three lenses among the first lens to the sixth lens are crescent-shaped at a near optical axis. The sixth lens has a negative focal power. The image side surface of the sixth lens is concave at the near optical axis and changes from the concave surface to a convex surface along a direction away from the optical axis. The lens group further comprises a fourth spacer element. The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter d4s of the object side surface of the fourth spacer element and the inner diameter d0m of the image side end surface of the lens barrel satisfy: 1.5<|f5-f6| / (d0m-d4s)<4.0. The application solves the problem that the stability and miniaturization of the imaging lens in the prior art are difficult to be simultaneously considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging device, in particular to an imaging lens. BACKGROUND

[0002] With the continuous development of the optical field and the increasing demand of users, the optical imaging device is developed towards high imaging quality. For example, the imaging quality of the imaging lens is the key to the selection of users. Generally speaking, how to match the lenses and the spacing elements in the imaging lens is the main factor to determine the imaging quality.

[0003] For a six-piece imaging lens, the diameters of the two lenses close to the image side are usually much larger than the diameters of the lenses close to the object side, which leads to the rationality of the setting of the spacing elements between the lenses being easily ignored in the design process in order to realize miniaturization, thereby making the assembly stability of the imaging lens poor and affecting the imaging performance of the imaging lens.

[0004] That is, the imaging lens in the prior art has the problem that stability and miniaturization are difficult to be considered simultaneously. SUMMARY

[0005] The main purpose of the present application is to provide an imaging lens to solve the problem that the imaging lens in the prior art has the problem that stability and miniaturization are difficult to be considered simultaneously.

[0006] In order to achieve the above-mentioned purpose, the present application provides an imaging lens, which comprises a lens barrel and a lens group arranged in the lens barrel. The lens barrel comprises an object side end face, an image side end face, an outer annular face and an inner annular face. The outer annular face and the inner annular face are connected with the object side end face and the image side end face. The outer annular face is arranged away from the optical axis of the lens barrel relative to the inner annular face, and the opening diameter of the inner annular face gradually increases from the object side to the image side. The lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side. At least three lenses among the first lens to the sixth lens are crescent-shaped at the near optical axis. The sixth lens has a negative focal length. The image side face of the sixth lens is concave at the near optical axis and changes from concave to convex along the direction away from the optical axis. The lens group further comprises a fourth spacing element, which at least partially abuts with the image side face of the fourth lens. The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter d4s of the object side face of the fourth spacing element and the inner diameter d0m of the image side end face of the lens barrel satisfy: 1.5<|f5-f6| / (d0m-d4s)<4.0.

[0007] Further, the lens set further comprises a first spacer element, the first spacer element at least partially abutting the image side surface of the first lens; an outer diameter D4s of the object side surface of the fourth spacer element, an outer diameter D1s of the object side surface of the first spacer element, an air interval T45 on the optical axis between the fourth lens and the fifth lens, and a refractive index N4 of the fourth lens satisfy: 3.5<(D4s-D1s) / (T45*(N4-1))<12.

[0008] Further, the lens set further comprises a fifth spacer element and a sixth spacer element, the fifth spacer element at least partially abutting the image side surface of the fifth lens, and the sixth spacer element at least partially abutting the image side surface of the sixth lens; a distance Td on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, an interval EP45 along the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element, and an interval EP56 along the optical axis from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element satisfy: 2.5<Td / (EP45+EP56)≤5.0.

[0009] Further, the lens set further comprises a first spacer element and a third spacer element, the first spacer element at least partially abutting the image side surface of the first lens, and the third spacer element at least partially abutting the image side surface of the third lens; an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, and an interval EP13 along the optical axis from the image side surface of the first spacer element to the object side surface of the third spacer element satisfy: 1.5≤(f2+f3) / EP13<6.5.

[0010] Further, the lens set further comprises a third spacer element, the third spacer element at least partially abutting the image side surface of the third lens; an effective focal length f3 of the third lens, a central thickness CT3 of the third lens, and a maximum thickness CP3 of the third spacer element satisfy: 18<f3 / (CT3+CP3)<45.

[0011] Further, the lens set further comprises a fifth spacer element, the fifth spacer element at least partially abutting the image side surface of the fifth lens; a radius of curvature R8 of the image side surface of the fourth lens, a radius of curvature R9 of the object side surface of the fifth lens, a central thickness CT5 of the fifth lens, and an interval EP45 along the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element satisfy: -160<(R8+R9) / (EP45-CT5)<-35.

[0012] Further, the lens set further comprises a first spacer element, the first spacer element at least partially abutting the image side surface of the first lens; a radius of curvature R1 of the object side surface of the first lens, a radius of curvature R2 of the image side surface of the first lens, an outer diameter D1m of the image side surface of the first spacer element, and an inner diameter d1s of the object side surface of the first spacer element satisfy: 1.0<(R2-R1) / (D1m-d1s)<3.5.

[0013] Further, an outer diameter D4s of the object side surface of the fourth spacer element, an inner diameter d4s of the object side surface of the fourth spacer element, and an entrance pupil diameter EPD of the imaging lens satisfy: 3.0 < (D4s + d4s) / EPD < 8.0. 2 - d4s 2 2 <8.0.

[0014] Further, the lens set further comprises a sixth spacer element, the sixth spacer element at least partially abutting against the image side surface of the sixth lens; an effective focal length f6 of the sixth lens, an inner diameter d0m of the image side end surface of the lens barrel, and a minimum inner diameter d6 of the sixth spacer element satisfy: -8.5 < f6 / (d0m - d6) < -1.4.

[0015] Further, the lens set further comprises a first spacer element and a third spacer element, the first spacer element at least partially abutting against the image side surface of the first lens, the third spacer element at least partially abutting against the image side surface of the third lens; an effective focal length f2 of the second lens, an effective focal length f3 of the third lens, a distance EP13 along the optical axis from the image side surface of the first spacer element to the object side surface of the third spacer element, and an air separation T23 on the optical axis between the second lens and the third lens satisfy: 1.5 < (f2 + f3) / (EP13 - T23) < 8.5.

[0016] Further, the lens set further comprises a third spacer element, the third spacer element at least partially abutting against the image side surface of the third lens; a curvature radius R5 of the object side surface of the third lens, a curvature radius R6 of the image side surface of the third lens, an outer diameter D3s of the object side surface of the third spacer element, and an inner diameter d3s of the object side surface of the third spacer element satisfy: 2.0 < |R5 + R6| / (D3s + d3s) < 25.

[0017] Further, the lens set further comprises a first spacer element, the first spacer element at least partially abutting against the image side surface of the first lens; an inner diameter d0m of the image side end surface of the lens barrel, an outer diameter D1s of the object side surface of the first spacer element, and a maximum half field of view Semi-FOV of the imaging lens satisfy: 0.5 < TAN(Semi-FOV) / ((d0m - D1s) / Td) < 1.6.

[0018] Further, the fifth lens has positive refractive power, the lens set further comprises a third spacer element, the third spacer element at least partially abutting against the image side surface of the third lens; an effective focal length f5 of the fifth lens, a center thickness CT4 of the fourth lens, an air separation T45 on the optical axis between the fourth lens and the fifth lens, and a distance EP34 along the optical axis from the image side surface of the third spacer element to the object side surface of the fourth spacer element satisfy: 10 < f5 / (CT4 + T45 - EP34) < 20. ​

[0019] By applying the technical solution of the present application, the imaging lens comprises a lens barrel and a lens group arranged in the lens barrel. The lens barrel comprises an object side end face, an image side end face, an outer annular face and an inner annular face, the outer annular face and the inner annular face are connected with the object side end face and the image side end face, the outer annular face is arranged away from the optical axis of the lens barrel relative to the inner annular face, and the opening diameter of the inner annular face gradually increases from the object side to the image side. The lens group comprises, in sequence from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, at least three lenses among the first lens to the sixth lens are crescent-shaped at the near optical axis, the sixth lens has a negative focal length, and the image side face of the sixth lens is concave at the near optical axis and changes from concave to convex in the direction away from the optical axis. The lens group further comprises a fourth spacing element, the fourth spacing element at least partially abuts against the image side face of the fourth lens. The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter d4s of the object side face of the fourth spacing element and the inner diameter d0m of the image side end face of the lens barrel satisfy: 1.5 < |f5-f6| / (d0m-d4s) < 4.0.

[0020] By adjusting the effective focal lengths of the fifth lens and the sixth lens and matching the lens face shape, the inner diameter of the fourth spacing element can be set in a relatively small and reasonable range, so as to effectively control the exiting light of the fourth lens, reduce the inner diameter of the image side end face of the lens barrel, make the structure part of the imaging lens more compact, realize miniaturization and improve the assembly stability of the imaging lens. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0022] Figure 1 A structure schematic view of the lens group of the imaging lens of example one of the present application is shown;

[0023] Figure 1-1 A structure schematic view of the imaging lens of example one of the present application in a first state is shown;

[0024] Figure 1-2 A structure schematic view of the imaging lens of example one of the present application in a second state is shown;

[0025] Figure 1-3 A structure schematic view of the imaging lens of example one of the present application in a third state is shown;

[0026] Figures 2 to 5 An on-axis chromatic aberration curve, a distortion curve, a stigmation curve and a magnification chromatic aberration curve of example one of the present application are respectively shown;

[0027] Figure 6 A structure diagram of the lens set of the imaging lens of the second example of the present application is shown;

[0028] Figure 6-1 A structure diagram of the imaging lens of the second example of the present application in a first state is shown;

[0029] Figure 6-2 A structure diagram of the imaging lens of the second example of the present application in a second state is shown;

[0030] Figure 6-3 A structure diagram of the imaging lens of the second example of the present application in a third state is shown;

[0031] Figures 7 to 10 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a lateral chromatic aberration curve of the second example of the present application are shown respectively;

[0032] Figure 11 A structure diagram of the lens set of the imaging lens of the third example of the present application is shown;

[0033] Figure 11-1 A structure diagram of the imaging lens of the third example of the present application in a first state is shown;

[0034] Figure 11-2 A structure diagram of the imaging lens of the third example of the present application in a second state is shown;

[0035] Figure 11-3 A structure diagram of the imaging lens of the third example of the present application in a third state is shown;

[0036] Figures 12 to 15 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a lateral chromatic aberration curve of the third example of the present application are shown respectively;

[0037] Figure 16 A structure diagram of the lens set of the imaging lens of the fourth example of the present application is shown;

[0038] Figure 16-1 A structure diagram of the imaging lens of the fourth example of the present application in a first state is shown;

[0039] Figure 16-2 A structure diagram of the imaging lens of the fourth example of the present application in a second state is shown;

[0040] Figure 16-3 A structure diagram of the imaging lens of the fourth example of the present application in a third state is shown;

[0041] Figures 17 to 20 An on-axis chromatic aberration curve, an astigmatism curve, a distortion curve and a lateral chromatic aberration curve of the fourth example of the present application are shown respectively.

[0042] Wherein, the above figures include the following reference signs:

[0043] P0, lens barrel; STO, stop; E1, first lens; S1, object side surface of the first lens; S2, image side surface of the first lens; E2, second lens; S3, object side surface of the second lens; S4, image side surface of the second lens; E3, third lens; S5, object side surface of the third lens; S6, image side surface of the third lens; E4, fourth lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; E5, fifth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; E6, sixth lens; S11, object side surface of the sixth lens; S12, image side surface of the sixth lens; E7, filter; S13, object side surface of the filter; S14, image side surface of the filter; S15, imaging surface; P1, first spacer element; P2, second spacer element; P3, third spacer element; P4, fourth spacer element; P5, fifth spacer element; P5b, fifth auxiliary spacer element; P6, sixth spacer element. DETAILED DESCRIPTION

[0044] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0045] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0046] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0047] It should be noted that, in the present specification, the expressions first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0048] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for the convenience of illustration. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0049] In the present disclosure, the near-axis region refers to a region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the near-axis region. If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the near-axis region. The judgment of the surface shape in the near-axis region can be made according to the judgment method of those skilled in the art. The convexity or concavity can be judged by the sign of R value (R refers to the radius of curvature of the near-axis region, usually refers to the R value on the lens data in the optical software). For the incident light side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave. For the light exit side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0050] In order to solve the problem that the stability and miniaturization of the imaging lens in the prior art cannot be considered simultaneously, the present application provides an imaging lens.

[0051] As shown in Figures 1 to 20 The imaging lens comprises a lens barrel and a lens group arranged in the lens barrel. The lens barrel comprises an object side end surface, an image side end surface, an outer annular surface and an inner annular surface. The outer annular surface and the inner annular surface are connected with the object side end surface and the image side end surface. The outer annular surface is arranged away from the optical axis of the lens barrel relative to the inner annular surface. The opening diameter of the inner annular surface gradually increases from the object side to the image side. The lens group comprises first to sixth lenses arranged in sequence from the object side to the image side. At least three lenses among the first to sixth lenses are meniscus-shaped at the near optical axis. The sixth lens has a negative focal power. The image side surface of the sixth lens is concave at the near optical axis and changes from concave to convex in the direction away from the optical axis. The lens group further comprises a fourth spacer element. The fourth spacer element at least partially abuts with the image side surface of the fourth lens. The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter d4s of the object side surface of the fourth spacer element and the inner diameter d0m of the image side end surface of the lens barrel satisfy the following relationship: 1.5<|f5-f6| / (d0m-d4s)<4.0.

[0052] By adjusting the effective focal lengths of the fifth lens and the sixth lens and matching the lens surface shape, the inner diameter of the fourth spacer element can be set in a small and reasonable range, thereby effectively controlling the exiting light of the fourth lens, reducing the inner diameter of the image side end surface of the lens barrel, making the structure part of the imaging lens more compact, and realizing miniaturization while improving the assembly stability of the imaging lens.

[0053] Preferably, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter d4s of the object side surface of the fourth spacer element and the inner diameter d0m of the image side end surface of the lens barrel satisfy the following relationship: 1.53≤|f5-f6| / (d0m-d4s)≤3.63.

[0054] In the embodiment, the lens set further comprises a first spacer element, the first spacer element at least partially abutting the image-side surface of the first lens; the outer diameter D4s of the object-side surface of the fourth spacer element, the outer diameter D1s of the object-side surface of the first spacer element, the air gap T45 on the optical axis between the fourth lens and the fifth lens, and the refractive index N4 of the fourth lens satisfy: 3.5<(D4s-D1s) / (T45*(N4-1))<12. By adjusting the refractive index of the fourth lens, the air gap on the optical axis between the fourth lens and the fifth lens can be expanded or reduced, which is convenient for assembling in the structure, there is space to put the spacer element, the stray light generated by the blocking mechanism light refraction is blocked, and the direction of the light can be changed by the refractive index of the fourth lens. The optical effective diameter of the front end lens and the spacer element is adjusted, so that the outer diameter of the first spacer element reaches a reasonable value, and the rear end lens structure is compact. Preferably, 3.87≤(D4s-D1s) / (T45*(N4-1))≤11.74.

[0055] In the embodiment, the lens set further comprises a fifth spacer element and a sixth spacer element, the fifth spacer element at least partially abutting the image-side surface of the fifth lens, and the sixth spacer element at least partially abutting the image-side surface of the sixth lens; the distance Td on the optical axis from the object-side surface of the first lens to the image-side surface of the sixth lens, the interval EP45 on the optical axis from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element, and the interval EP56 on the optical axis from the image-side surface of the fifth spacer element to the object-side surface of the sixth spacer element satisfy: 2.5<Td / (EP45+EP56)≤5.0. By adjusting the distance on the optical axis from the first lens to the sixth lens to meet the requirements, the interval on the optical axis from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element can be adjusted, so that the interval between the fifth spacer element and the sixth spacer element can be expanded within a certain range under the premise of meeting the optical system, so that it has good stability in production. Preferably, 2.72≤Td / (EP45+EP56)≤4.87.

[0056] In the embodiment, the lens set further comprises a first spacer element and a third spacer element, the first spacer element at least partially abutting the image-side surface of the first lens, and the third spacer element at least partially abutting the image-side surface of the third lens; the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the distance EP13 along the optical axis from the image-side surface of the first spacer element to the object-side surface of the third spacer element satisfy: 1.5≤(f2+f3) / EP13<6.5. The focal length can control the quality of imaging, and by adjusting the effective focal lengths of the second lens and the third lens, the imaging system can have sufficient light passing through the first three spacer elements, meet the light amount of the imaging system, and improve the relative luminance of the outer field of view, which is conducive to correcting the off-axis aberration and improving the overall imaging quality of the system. Preferably, 1.5≤(f2+f3) / EP13≤6.30.

[0057] In the embodiment, the effective focal length f3 of the third lens, the central thickness CT3 of the third lens, and the maximum thickness CP3 of the third spacer element satisfy: 18<f3 / (CT3+CP3)<45. By controlling the effective focal length of the third lens, the air gap along the optical axis between the rear-end lens and the third lens is adjusted, and the central thickness of the third lens is controlled; within a certain range that meets the optical performance, the thickness of the third spacer element can be reduced to meet the requirement of compact barrel in the design of the imaging lens. Preferably, 18.16≤f3 / (CT3+CP3)≤41.95.

[0058] In the embodiment, the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, the central thickness CT5 of the fifth lens, and the distance EP45 along the optical axis from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element satisfy: -160<(R8+R9) / (EP45-CT5)<-35. By controlling the radius of curvature of the image-side surface of the fourth lens and the radius of curvature of the object-side surface of the fifth lens, the central thickness of the fifth lens can reach a reasonable value under the premise of meeting the system, which is convenient for molding. Adjusting the distance along the optical axis from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element can control the edge thickness of the lens within a certain range, and ensure the molding strength and assembly stability of the lens. Preferably, -156.95≤(R8+R9) / (EP45-CT5)≤-38.38.

[0059] In the embodiment, the lens set further comprises a first spacer element, the first spacer element at least partially abuts the image-side surface of the first lens; the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the outer diameter D1m of the image-side surface of the first spacer element and the inner diameter d1s of the object-side surface of the first spacer element satisfy: 1.0 < (R2-R1) / (D1m-d1s) < 3.5. Controlling the radius of curvature of the object-side surface of the first lens is more conducive to the imaging quality of the light rays passing through the first lens. Reasonably controlling the radius of curvature of the lens can make the light ray angle of the edge field within a reasonable range, and effectively reduce the sensitivity of the system. Controlling the outer diameter of the image-side surface of the first spacer element and the inner diameter of the object-side surface of the first spacer element can control the off-axis aberration and improve the overall imaging quality of the system. Preferably, 1.39 ≤ (R2-R1) / (D1m-d1s) ≤ 3.34.

[0060] In the embodiment, the outer diameter D4s of the object-side surface of the fourth spacer element, the inner diameter d4s of the object-side surface of the fourth spacer element and the entrance pupil diameter EPD of the imaging lens satisfy: 3.0 < (D4s 2 -d4s 2 ) / EPD 2 < 8.0. By controlling the entrance pupil diameter of the imaging lens, sufficient aperture size is ensured to meet the depth of field and illumination required by optical design. The outer diameter of the object-side surface of the fourth spacer element is controlled, and the inner diameter of the object-side surface of the fourth spacer element can correct aberration and improve imaging quality. Preferably, 3.27 ≤ (D4s 2 -d4s 2 ) / EPD 2 ≤ 7.82.

[0061] In the embodiment, the lens set further comprises a sixth spacer element, the sixth spacer element at least partially abuts the image-side surface of the sixth lens; the effective focal length f6 of the sixth lens, the inner diameter d0m of the image-side end surface of the lens barrel and the minimum inner diameter d6 of the sixth spacer element satisfy: -8.5 < f6 / (d0m-d6) < -1.4. The effective focal length of the sixth lens is constrained, which can control the contribution of the sixth lens to the spherical aberration in the system and compensate for the fifth-order spherical aberration generated by the lens. The minimum inner diameter of the sixth spacer element cooperates with the inner diameter of the image-side end surface of the lens barrel to achieve the stability of the surface shape in production, thereby improving the assembly stability in production. Preferably, -8.06 ≤ f6 / (d0m-d6) ≤ -1.48.

[0062] In the embodiment, the third interval element at least partially abuts against the image-side surface of the third lens; the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the interval EP13 of the image-side surface of the first interval element to the object-side surface of the third interval element along the optical axis, and the air interval T23 on the optical axis between the second lens and the third lens satisfy: 1.5 < (f2+f3) / (EP13-T23) < 8.5. By controlling the effective focal length of the second lens and the effective focal length of the third lens, the chromatic aberration is corrected, the imaging quality is improved, and the interval of the first interval element and the third interval element along the optical axis is controlled, so that the lateral chromatic aberration of the edge field of view of the imaging lens is improved, and at the same time, the air interval on the optical axis between the second lens and the third lens is adjusted, so that the change of the partial field curvature is adjusted, and the imaging quality is improved. Preferably, 1.83≤(f2+f3) / (EP13-T23)≤8.27.

[0063] In the embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, the outer diameter D3s of the object-side surface of the third interval element, and the inner diameter d3s of the object-side surface of the third interval element satisfy: 2.0<|R5+R6| / (D3s+d3s)<25. By controlling the radius of curvature of the object-side surface of the third lens and the radius of curvature of the image-side surface of the third lens, the lens can be better controlled in molding, and when the outer diameter of the object-side surface of the third interval element and the inner diameter of the object-side surface of the third interval element meet the requirements, the structure is better adjusted in the imaging system, which is beneficial to avoid stray light caused by internal total reflection. Preferably, 2.48≤|R5+R6| / (D3s+d3s)≤23.42.

[0064] In the embodiment, the inner diameter d0m of the image-side end surface of the lens barrel, the outer diameter D1s of the object-side surface of the first interval element, and the maximum half field of view Semi-FOV of the imaging lens satisfy: 0.5<TAN(Semi-FOV) / ((d0m-D1s) / Td)<1.6. By controlling the condition, the outer diameter of the first interval element and the inner diameter of the image-side end surface of the lens barrel can be effectively controlled, the field of view of the imaging lens is ensured, the size of the imaging lens is effectively reduced, the optical performance of the imaging lens is ensured, and the light quantity can meet the premise, which is easier to process and stably assemble. Preferably, 0.85≤TAN(Semi-FOV) / ((d0m-D1s) / Td)≤1.55.

[0065] In the embodiment, the fifth lens has positive refractive power; the effective focal length f5 of the fifth lens, the center thickness CT4 of the fourth lens, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the distance EP34 along the optical axis from the image side surface of the third spacer element to the object side surface of the fourth spacer element satisfy: 10 < f5 / (CT4+T45-EP34) < 20. The effective focal length of the fifth lens and the center thickness of the fourth lens can control the depth of field, meet the requirements of optical performance, the air gap between the fourth lens and the fifth lens on the optical axis can adjust the curvature of field of the outer field of view, improve the stability of assembly and imaging quality, and the distance along the optical axis from the image side surface of the third spacer element to the object side surface of the fourth spacer element can correct the on-axis aberration, and improve the system imaging quality. Preferably, 10.94 ≤ f5 / (CT4+T45-EP34) ≤ 18.81.

[0066] Optionally, the imaging lens described above can further include a protective glass or a filter for protecting the photosensitive element located on the imaging surface.

[0067] The imaging lens in the present application can adopt multiple lenses, for example, six lenses as described above. In the present application, at least one of the lens surfaces of each lens is an aspherical lens surface. The aspherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens surface which has constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics, has the advantages of improving distortion aberration and improving astigmatism aberration. After using the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0068] However, those skilled in the art should understand that the number of lenses constituting the imaging lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification. For example, although six lenses are described as an example in the embodiments, the imaging lens is not limited to including six lenses. If necessary, the imaging lens can also include other numbers of lenses.

[0069] It should be noted that in the following examples, there are first, second and third states, and the curvature radius, center thickness and other parameters of the first to sixth lenses of the imaging lens in the first, second and third states in the same example are the same, but the thickness, inner diameter and outer diameter of the lens barrel, the first to sixth spacer elements and the shape of part of the lenses are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

[0070] It should be noted that any one of the following examples 1 to 4 applies to all embodiments of the present application.

[0071] Example 1

[0072] As shown in Figures 1 to 5 , an imaging lens of example 1 is described. Figure 1 The structural diagram of the lens group in the imaging lens is shown. Figure 1-1 The structural diagram of the imaging lens of example 1 in the first state is shown, Figure 1-2 The structural diagram of the imaging lens of example 1 in the second state is shown, Figure 1-3 The structural diagram of the imaging lens of example 1 in the third state is shown.

[0073] As shown in Figure 1 , the lens group includes, in order from the object side to the image side, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

[0074] As shown in Figures 1-1 to 1-3 , the lens group further includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6, each of which cooperates with the lenses in the lens barrel P0.

[0075] As shown in Figure 1-1As shown, in the first state, the imaging lens, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 are in abutment with the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, and the outer periphery of the first spacer element P1 is in abutment with the inner wall surface of the lens barrel P0. The second spacer element P2 is located between the second lens E2 and the third lens E3, the object side surface and the image side surface of the second spacer element P2 are in abutment with the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively, and the outer periphery of the second spacer element P2 is in abutment with the inner wall surface of the lens barrel P0. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 are in abutment with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 is in abutment with the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 are in abutment with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 is in abutment with the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 are in abutment with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 is in abutment with the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 is in abutment with the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0 simultaneously.

[0076] As Figure 1-2As shown, in the second state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 at least partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, the first lens E1 and the second lens E2 are snap-fitted, and the outer periphery of the first spacer element P1 abuts the first lens E1. The second spacer element P2 is located between the second lens E2 and the third lens E3, the object side surface and the image side surface of the second spacer element P2 at least partially abut the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively, and the outer periphery of the second spacer element P2 abuts the inner wall surface of the lens barrel P0. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 at least partially abut the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 abuts the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 at least partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 abuts the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 at least partially abut the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 abuts the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 simultaneously abuts the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0077] As Figure 1-3As shown, in the third state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 at least partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, the first lens E1 and the second lens E2 are snap-fit arranged, and the outer periphery of the first spacer element P1 abuts the first lens E1. The second spacer element P2 is located between the second lens E2 and the third lens E3, the object side surface and the image side surface of the second spacer element P2 at least partially abut the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively, the second lens E2 and the third lens E3 are snap-fit arranged, and the outer periphery of the second spacer element P2 abuts the second lens E2. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 at least partially abut the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 abuts the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 at least partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 abuts the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 at least partially abut the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 abuts the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 simultaneously abuts the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0078] In summary, the parameters of the imaging lens of Example One in the first state 1-1, the second state 1-2, and the third state 1-3 are shown in Table 1. (Unit: millimeter)

[0079] Parameter / state 1-1 1-2 1-3 d1s 1.6878 1.6878 1.6878 D1s 3.1850 2.7917 2.7917 D1m 3.1850 2.7917 2.7917 d3s 1.6414 1.7292 1.7292 D3s 4.3509 4.3509 4.4979 d4s 2.2492 2.2492 2.2492 D4s 5.1890 4.9526 4.9526 d6 4.6557 4.6557 4.6557 d0m 6.1158 6.1158 6.1158 CP3 0.0220 0.0220 0.0220 EP34 0.3979 0.3325 0.3325 EP45 0.3506 0.3506 0.3506 EP56 0.3044 0.3044 0.3044 EP13 0.6364 0.7019 0.7019

[0080] Table 1

[0081] In Example One, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 includes the object side surface S13 of the filter and the image side surface S14 of the filter. Light from an object sequentially passes through each surface S1 to S14 and is finally imaged on the imaging surface S15.

[0082] In example one, the effective focal length f1 of the first lens is 2.91 mm, the effective focal length f2 of the second lens is -5.27 mm, the effective focal length f3 of the third lens is 6.33 mm, the effective focal length f4 of the fourth lens is -30.65 mm, the effective focal length f5 of the fifth lens is -25.82 mm, the effective focal length f6 of the sixth lens is -11.77 mm, the effective focal length f of the imaging lens is 3.28 mm, the maximum field of view FOV of the imaging lens is 82.8°, and the aperture value Fno of the imaging lens is 1.85.

[0083] Table 2 shows the basic structure parameter table of the imaging lens of example one, wherein the units of the radius of curvature and the thickness / distance are millimeters (mm).

[0084]

[0085] Table 2

[0086] In example one, the object side and the image side of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0087]

[0088] wherein x is the distance sag of the aspherical surface at a height h along the optical axis from the vertex of the aspherical surface, c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above, k is the conic coefficient, and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 below shows the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for each aspherical surface S1-S12 in example one.

[0089]

[0090]

[0091] Table 3

[0092] Figure 2 The on-axis chromatic aberration curve of the imaging lens of example one is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging lens. Figure 3 The astigmatism curve of the imaging lens of example one is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 4 The distortion curve of the imaging lens of example one is shown, which represents the distortion size value corresponding to different field angles. Figure 5 The rate of change of magnification curve of the imaging lens of example one is shown, which represents the deviation of light rays on the imaging surface after passing through the imaging lens.

[0093] According to Figures 2 to 5 It can be seen that the imaging lens provided in Example One can achieve good imaging quality.

[0094] Example Two

[0095] As Figures 6 to 10 shown, the imaging lens of Example Two is described. Figure 6 The structural schematic diagram of the lens group in the imaging lens is shown. Figure 6-1 The structural schematic diagram of the imaging lens of Example Two in the first state is shown, Figure 6-2 The structural schematic diagram of the imaging lens of Example Two in the second state is shown, Figure 6-3 The structural schematic diagram of the imaging lens of Example Two in the third state is shown.

[0096] As Figure 6 shown, the lens group comprises, in order from the object side to the image side, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

[0097] As Figures 6-1 to 6-3 shown, the lens group further comprises a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6, each of which cooperates with the lenses in the lens barrel P0.

[0098] As Figure 6-1As shown, in the first state, the imaging lens, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 are in abutment with the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, and the outer periphery of the first spacer element P1 is in abutment with the inner wall surface of the lens barrel P0. The second spacer element P2 is located between the second lens E2 and the third lens E3, the object side surface and the image side surface of the second spacer element P2 are in abutment with the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively, and the outer periphery of the second spacer element P2 is in abutment with the inner wall surface of the lens barrel P0. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 are in abutment with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 is in abutment with the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 are in abutment with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 is in abutment with the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 are in abutment with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 is in abutment with the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 is in abutment with the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0 simultaneously.

[0099] As Figure 6-2As shown, in the second state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 are in at least partial abutment with the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, and the outer periphery of the first spacer element P1 is in abutment with the inner wall surface of the lens barrel P0. The second spacer element P2 is located between the second lens E2 and the third lens E3, the object side surface and the image side surface of the second spacer element P2 are in at least partial abutment with the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively, and the outer periphery of the second spacer element P2 is in abutment with the inner wall surface of the lens barrel P0. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 are in at least partial abutment with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 is in abutment with the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 are in at least partial abutment with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 is in abutment with the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 are in at least partial abutment with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 is in abutment with the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 is in abutment with the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0 simultaneously.

[0100] As Figure 6-3As shown, in the third state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 at least partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, the first lens E1 and the second lens E2 are snap-fitted, and the outer periphery of the first spacer element P1 abuts the first lens E1. The second spacer element P2 is located between the second lens E2 and the third lens E3, the object side surface and the image side surface of the second spacer element P2 at least partially abut the image side surface S4 of the second lens and the object side surface S5 of the third lens respectively, and the outer periphery of the second spacer element P2 abuts the inner wall surface of the lens barrel P0. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 at least partially abut the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 abuts the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 at least partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 abuts the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 at least partially abut the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 abuts the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and simultaneously abuts the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0101] In summary, the parameters of the imaging lens of Example Two in the first state 2-1, the second state 2-2, and the third state 2-3 are shown in Table 4. (Unit: millimeter)

[0102]

[0103]

[0104] Table 4

[0105] In Example Two, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The object side S3 of the second lens is concave, and the image side S4 of the second lens is concave. The object side S5 of the third lens is convex, and the image side S6 of the third lens is convex. The object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is concave, and the image side S10 of the fifth lens is convex. The object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is concave. The filter E7 includes the object side S13 of the filter and the image side S14 of the filter. The light from the object sequentially passes through the surfaces S1-S14 and is finally imaged on the imaging surface S15.

[0106] In Example Two, the effective focal length f1 of the first lens is 2.87 mm, the effective focal length f2 of the second lens is -6.90 mm, the effective focal length f3 of the third lens is 10.32 mm, the effective focal length f4 of the fourth lens is -2560.37 mm, the effective focal length f5 of the fifth lens is 5.22 mm, the effective focal length f6 of the sixth lens is -2.29 mm, the effective focal length f of the imaging lens is 3.37 mm, the maximum field of view FOV of the imaging lens is 84.5°, and the aperture value Fno of the imaging lens is 2.01.

[0107] Table 5 shows the basic structure parameter table of the imaging lens of Example Two, wherein the units of the radius of curvature and the thickness / distance are millimeters (mm).

[0108]

[0109] Table 5

[0110] Table 6 shows the high-order term coefficients of the aspherical surfaces in Example Two, wherein each aspherical surface can be defined by the formula (1) given in Example One.

[0111] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 0.0184 -0.0095 0.2543 -1.4301 5.1733 -11.5782 15.2541 -10.7502 2.8945 S2 -0.0499 0.0285 -0.6210 4.4341 -19.9936 54.0653 -87.0484 76.9159 -28.6258 S3 -0.0695 0.2646 -0.7871 4.8925 -21.3950 58.0735 -94.3424 84.8587 -32.1996 S4 -0.0319 0.4208 -1.7384 11.6318 -51.3414 144.1536 -243.9505 227.2427 -87.0841 S5 -0.1153 -0.1968 2.4739 -19.9163 87.7655 -235.1989 378.5106 -338.3379 129.9343 S6 -0.1240 0.1366 -1.9650 10.6822 -37.4453 79.4608 -99.7789 67.7755 -18.8449 S7 -0.2665 0.1890 -1.4187 6.0591 -15.0747 20.8080 -13.8690 2.9287 0.4603 S8 -0.2710 0.2512 -1.5322 6.1789 -14.4738 20.6020 -17.1927 7.7756 -1.4810 S9 -0.0077 -0.0740 -0.4923 1.6289 -2.6852 2.6245 -1.5252 0.4825 -0.0632 S10 0.1242 -0.2221 0.1649 -0.0651 0.0152 -0.0022 0.0002 0.0000 0.0000 S11 -0.2901 0.1522 -0.0451 0.0152 -0.0055 0.0013 -0.0002 0.0000 0.0000 S12 -0.1837 0.1192 -0.0629 0.0252 -0.0076 0.0016 -0.0002 0.0000 0.0000

[0112] Table 6

[0113] Figure 7 The axial chromatic aberration curve of the imaging lens of Example Two is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging lens. Figure 8 The astigmatism curve of the imaging lens of Example Two is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 9 The distortion curve of the imaging lens of Example Two is shown, which represents the distortion size values corresponding to different field angles. Figure 10 The magnification chromatic aberration curve of the imaging lens of Example Two is shown, which represents the deviation of light rays on the imaging surface after passing through the imaging lens.

[0114] According toFigures 7 to 10 It can be seen that the imaging lens of Example Two can achieve good imaging quality.

[0115] Example Three

[0116] As shown in Figures 11 to 15 , the imaging lens of Example Three is described. Figure 11 The structural diagram of the lens group in the imaging lens is shown. Figure 11-1 The structural diagram of the imaging lens of Example Three in the first state is shown, Figure 11-2 The structural diagram of the imaging lens of Example Three in the second state is shown, Figure 11-3 The structural diagram of the imaging lens of Example Three in the third state is shown.

[0117] As shown in Figure 11 , the lens group comprises, in order from the object side to the image side, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7.

[0118] As shown in Figures 11-1 to 11-3 , the lens group further comprises a first spacer element P1, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a fifth auxiliary spacer element P5b, and a sixth spacer element P6, each of which cooperates with the lenses in the lens barrel P0. In this example, no second spacer element is provided.

[0119] As shown in Figure 11-1As shown, in the first state, the imaging lens has the following configuration: First spacer element P1 is located between first lens E1 and second lens E2. The object-side and image-side of first spacer element P1 are at least partially in contact with the image-side S2 of first lens and the object-side S3 of second lens, respectively. The outer periphery of first spacer element P1 is in contact with the inner wall of lens barrel P0. Second lens E2 and third lens E3 are engaged. Third spacer element P3 is located between third lens E3 and fourth lens E4. The object-side and image-side of third spacer element P3 are at least partially in contact with the image-side S6 of third lens and the object-side S7 of fourth lens, respectively. The outer periphery of third spacer element P3 is in contact with the inner wall of lens barrel P0. Fourth spacer element P4 is located between fourth lens E4 and fifth lens E5. The object-side and image-side of fourth spacer element P4 are at least partially in contact with the image-side S8 of fourth lens and the object-side S9 of fifth lens, respectively. The outer periphery of fourth spacer element P4 is in contact with the inner wall of lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6. The object-side and image-side surfaces of the fifth spacer element P5 at least partially abut against the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The outer periphery of the fifth spacer element P5 abuts against the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image-side of the sixth lens E6. The sixth spacer element P6 abuts against both the image-side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0120] like Figure 11-2As shown, in the second state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 at least partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, and the outer periphery of the first spacer element P1 abuts the inner wall surface of the lens barrel P0. The second lens E2 and the third lens E3 are snap-fitted. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 at least partially abut the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 abuts the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 at least partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 abuts the inner wall surface of the lens barrel P0. The fifth spacer element P5 and the fifth auxiliary spacer element P5b are located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 at least partially abut the image side surface S10 of the fifth lens and the object side surface of the fifth auxiliary spacer element P5b respectively, the image side surface of the fifth auxiliary spacer element P5b at least partially abuts the object side surface S11 of the sixth lens, and the outer peripheries of the fifth spacer element P5 and the fifth auxiliary spacer element P5b both abut the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 simultaneously abuts the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0121] As Figure 11-3As shown, in the third state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 at least partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, and the outer periphery of the first spacer element P1 abuts the inner wall surface of the lens barrel P0. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 at least partially abut the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 abuts the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 at least partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 abuts the inner wall surface of the lens barrel P0. The fifth spacer element P5 and the fifth auxiliary spacer element P5b are located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 at least partially abut the image side surface S10 of the fifth lens and the object side surface of the fifth auxiliary spacer element P5b respectively, the image side surface of the fifth auxiliary spacer element P5b at least partially abuts the object side surface S11 of the sixth lens, and the outer peripheries of the fifth spacer element P5 and the fifth auxiliary spacer element P5b both abut the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and at the same time abuts the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0122] In summary, the parameters of the imaging lens of Example Three in the first state 3-1, the second state 3-2, and the third state 3-3 are shown in Table 7. (Unit: millimeter)

[0123]

[0124]

[0125] Table 7

[0126] In Example Three, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a concave surface. The object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 includes the object side surface S13 of the filter and the image side surface S14 of the filter. The light from the object sequentially passes through each surface S1 to S14 and is finally imaged on the imaging surface S15.

[0127] In Example 3, the effective focal length of the first lens element is f1, which is 3.13mm; the effective focal length of the second lens element is f2, which is -8.65mm; the effective focal length of the third lens element is f3, which is 12.33mm; the effective focal length of the fourth lens element is f4, which is -27.64mm; the effective focal length of the fifth lens element is f5, which is 3.77mm; the effective focal length of the sixth lens element is f6, which is -2.28mm; the effective focal length of the imaging lens is f, which is 3.12mm; the maximum field of view (FOV) of the imaging lens is 82.7°; and the aperture value (Fno) of the imaging lens is 1.90.

[0128] Table 8 shows the basic structural parameters of the imaging lens in Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0129]

[0130]

[0131] Table 8

[0132] Table 9 shows the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0133] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.0006 0.2030 -1.3960 5.5254 -12.6138 16.3072 -11.0992 2.9819 0.0000 S2 -0.0663 0.2291 -1.6764 7.4871 -20.3423 31.4516 -25.9094 8.8535 0.0000 S3 -0.1272 0.4325 -1.5425 6.5465 -18.3475 29.7012 -25.1584 8.7592 0.0000 S4 -0.0784 0.3657 -0.4085 1.0619 -2.1892 2.0234 0.0000 0.0000 0.0000 S5 -0.2180 1.3451 -11.9991 66.8438 -243.9361 568.4112 -814.6379 650.1038 -219.5043 S6 -0.1877 0.3946 -2.1667 7.2969 -18.3885 31.4385 -34.9166 22.8158 -6.4519 S7 -0.3165 0.1532 0.9926 -6.7827 20.8618 -37.0266 38.6661 -21.7103 4.9748 S8 -0.2686 -0.0709 1.4147 -4.9728 9.8487 -11.8923 8.8272 -3.7000 0.6649 S9 -0.0863 0.1217 -0.4833 0.8867 -1.0464 0.7256 -0.2847 0.0582 -0.0052 S10 -0.0801 0.1376 -0.1972 0.2283 -0.2070 0.1165 -0.0374 0.0063 -0.0004 S11 -0.7482 0.8606 -0.5661 0.2364 -0.0644 0.0114 -0.0013 0.0001 0.0000 S12 -0.2515 0.2125 -0.1063 0.0331 -0.0065 0.0008 -0.0001 0.0000 0.0000

[0134] Table 9

[0135] Figure 12 The on-axis chromatic aberration curve of the imaging lens in Example 3 is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the imaging lens. Figure 13 The astigmatism curve of the imaging lens in Example 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 14 The distortion curve of the imaging lens in Example 3 is shown, which represents the distortion magnitude corresponding to different field of view angles. Figure 15 The magnification chromatic aberration curve of the imaging lens in Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the imaging lens.

[0136] according to Figures 12 to 15 As can be seen, the imaging lens given in Example 3 can achieve good image quality.

[0137] Example 4

[0138] like Figures 16 to 20 As shown, the imaging lens of Example 4 is described. Figure 16 A schematic diagram of the lens assembly in the imaging lens is shown. Figure 16-1 A schematic diagram of the imaging lens in Example 4 in its first state is shown. Figure 16-2 A schematic diagram of the imaging lens in Example 4 in the second state is shown.Figure 16-3 FIG. 4 shows a structure diagram of the imaging lens of Example Four in the third state.

[0139] As shown in FIG. 4, the lens group comprises, in order from the object side to the image side, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7. Figure 16

[0140] As shown in FIG. 4, the lens group further comprises a first spacer element P1, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, and a sixth spacer element P6, each of which cooperates with a lens in the lens barrel P0. In this example, no second spacer element is provided. Figures 16-1 to 11-3

[0141] As shown in FIG. 4, in the first state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 abut at least partially with the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, and the outer periphery of the first spacer element P1 abuts with the inner wall surface of the lens barrel P0. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 abut at least partially with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 abuts with the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 abut at least partially with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 abuts with the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 abut at least partially with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 abuts with the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and abuts with the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0 simultaneously. Figure 16-1

[0142] Figure 16-2 ​​​​As shown, in the second state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 at least partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, the first lens E1 and the second lens E2 are snap-fitted, and the outer periphery of the first spacer element P1 abuts the first lens E1. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 at least partially abut the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, and the outer periphery of the third spacer element P3 abuts the inner wall surface of the lens barrel P0. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 at least partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, and the outer periphery of the fourth spacer element P4 abuts the inner wall surface of the lens barrel P0. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 at least partially abut the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 abuts the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 simultaneously abuts the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0143] As Figure 16-3As shown, in the third state, the first spacer element P1 is located between the first lens E1 and the second lens E2, the object side surface and the image side surface of the first spacer element P1 at least partially abut the image side surface S2 of the first lens and the object side surface S3 of the second lens respectively, the first lens E1 and the second lens E2 are snap-fit arranged, and the outer periphery of the first spacer element P1 abuts the first lens E1. The third spacer element P3 is located between the third lens E3 and the fourth lens E4, the object side surface and the image side surface of the third spacer element P3 at least partially abut the image side surface S6 of the third lens and the object side surface S7 of the fourth lens respectively, the third lens E3 and the fourth lens E4 are snap-fit arranged, and the outer periphery of the third spacer element P3 abuts the third lens E3. The fourth spacer element P4 is located between the fourth lens E4 and the fifth lens E5, the object side surface and the image side surface of the fourth spacer element P4 at least partially abut the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens respectively, the fourth lens E4 and the fifth lens E5 are snap-fit arranged, and the outer periphery of the fourth spacer element P4 abuts the fourth lens E4. The fifth spacer element P5 is located between the fifth lens E5 and the sixth lens E6, the object side surface and the image side surface of the fifth spacer element P5 at least partially abut the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens respectively, and the outer periphery of the fifth spacer element P5 abuts the inner wall surface of the lens barrel P0. The sixth spacer element P6 is located on the image side of the sixth lens E6, and the sixth spacer element P6 simultaneously abuts the image side surface S12 of the sixth lens and the inner wall surface of the lens barrel P0.

[0144] In summary, the parameters of the imaging lens of Example Four in the first state 4-1, the second state 4-2, and the third state 4-3 are shown in Table 10. (Unit: millimeter)

[0145] Parameter / state 4-1 4-2 4-3 d1s 1.6761 1.6761 1.6761 D1s 3.2016 2.7208 3.0777 D1m 3.2016 2.7208 3.0777 d3s 1.8301 1.8301 1.8301 D3s 4.3675 2.7620 3.1189 d4s 2.3127 2.3127 2.3127 D4s 5.2057 5.2057 5.2057 d6 4.9539 4.9539 4.9539 d0m 5.7473 6.1862 6.1862 CP3 0.0220 0.0220 0.0220 EP34 0.3912 0.3912 0.3912 EP45 0.4177 0.4177 0.3773 EP56 0.6945 0.6945 0.7343 EP13 0.6379 0.6379 0.6379

[0146] Table 10

[0147] In Example Four, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface. The filter E7 includes the object side surface S13 of the filter and the image side surface S14 of the filter. The light from the object sequentially passes through each surface S1 to S14 and is finally imaged on the imaging surface S15.

[0148] In Example Four, the effective focal length f1 of the first lens is 3.12 mm, the effective focal length f2 of the second lens is -7.95 mm, the effective focal length f3 of the third lens is 10.21 mm, the effective focal length f4 of the fourth lens is -17.54 mm, the effective focal length f5 of the fifth lens is 3.62 mm, the effective focal length f6 of the sixth lens is -2.32 mm, the effective focal length f of the imaging lens is 3.07 mm, the maximum field of view FOV of the imaging lens is 83.8°, and the aperture value Fno of the imaging lens is 1.83.

[0149] Table 11 shows the basic structure parameter table of the imaging lens of Example Four, wherein the units of the radius of curvature, thickness / distance are millimeters mm.

[0150]

[0151]

[0152] Table 11

[0153] Table 12 shows the high-order term coefficients of the aspherical surfaces that can be used in Example Four, wherein each aspherical surface type can be defined by the formula (1) given in Example One.

[0154]

[0155] Table 12

[0156] Figure 17 The axial chromatic aberration curve of the imaging lens of Example Four is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging lens. Figure 18 The astigmatism curve of the imaging lens of Example Four is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 19 The distortion curve of the imaging lens of Example Four is shown, which represents the distortion size values corresponding to different field angles. Figure 20 The rate of change of the imaging lens of Example Four is shown, which represents the deviation of light rays on the imaging surface after passing through the imaging lens.

[0157] According to Figures 17 to 20 It can be seen that the imaging lens given in Example Four can achieve good imaging quality.

[0158] In summary, Examples One to Four respectively satisfy the relationships shown in Table 13.

[0159]

[0160]

[0161] Table 13

[0162] It should be noted that 1-1 in Table 13 represents the imaging lens in Example One in the first state, 1-2 represents the imaging lens in Example One in the second state, 1-3 represents the imaging lens in Example One in the third state, 2-1 represents the imaging lens in Example Two in the first state, 2-2 represents the imaging lens in Example Two in the second state, 2-3 represents the imaging lens in Example Two in the third state, 3-1 represents the imaging lens in Example Three in the first state, 3-2 represents the imaging lens in Example Three in the second state, 3-3 represents the imaging lens in Example Three in the third state, 4-1 represents the imaging lens in Example Four in the first state, 4-2 represents the imaging lens in Example Four in the second state, and 4-3 represents the imaging lens in Example Four in the third state.

[0163] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be a standalone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.

[0164] Obviously, the above-described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should belong to the scope of the present application.

[0165] It should be noted that the terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise, and it should be understood that the use of the term "comprise" and / or "include" in the specification indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0166] It should be noted that the terms "first", "second", and the like used in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0167] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An imaging lens, characterized in that, The lens barrel comprises a lens barrel and a lens group arranged in the lens barrel, The lens barrel comprises an object-side end surface, an image-side end surface, an outer annular surface and an inner annular surface, the outer annular surface and the inner annular surface are connected with the object-side end surface and the image-side end surface, the outer annular surface is arranged away from the optical axis of the lens barrel relative to the inner annular surface, and the opening diameter of the inner annular surface gradually increases from the object side to the image side; The total number of lenses of the lens group is six, the lens group comprises, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, at least three lenses among the first lens to the sixth lens are meniscus-shaped at the near optical axis, the sixth lens has a negative optical power, the image-side surface of the sixth lens is concave at the near optical axis and changes from concave to convex in the direction away from the optical axis; The first lens has a positive optical power, the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave; The second lens has a negative optical power, and the image-side surface of the second lens is concave; The third lens has a positive optical power, and the object-side surface of the third lens is convex; The fourth lens has a negative optical power; The lens group further comprises a fourth spacer element, the fourth spacer element at least partially abuts with the image-side surface of the fourth lens; Wherein, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the inner diameter d4s of the object-side surface of the fourth spacer element and the inner diameter d0m of the image-side end surface of the lens barrel satisfy: 1.5<|f5-f6| / (d0m-d4s)≤3.63; An outer diameter D4s of an object side surface of the fourth spacer element, an inner diameter d4s of the object side surface of the fourth spacer element, and an entrance pupil diameter EPD of the imaging lens satisfy: 3.27 ≤ (D4s 2 - d4s 2 ) / EPD 2 ≤ 7.

82.

2. The imaging lens according to claim 1, characterized in that, The lens group further comprises a first spacer element, the first spacer element at least partially abuts with the image-side surface of the first lens; the outer diameter D4s of the object-side surface of the fourth spacer element, the outer diameter D1s of the object-side surface of the first spacer element, the air gap T45 between the fourth lens and the fifth lens on the optical axis and the refractive index N4 of the fourth lens satisfy: 3.87≤(D4s-D1s) / (T45*(N4-1))≤11.

74.

3. The imaging lens according to claim 1, characterized in that, The lens group further comprises a fifth spacer element and a sixth spacer element, the fifth spacer element at least partially abuts with the image-side surface of the fifth lens, and the sixth spacer element at least partially abuts with the image-side surface of the sixth lens; the distance Td of the object-side surface of the first lens to the image-side surface of the sixth lens on the optical axis, the interval EP45 of the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element along the optical axis and the interval EP56 of the image-side surface of the fifth spacer element to the object-side surface of the sixth spacer element along the optical axis satisfy: 2.72≤Td / (EP45+EP56)≤4.

87.

4. The imaging lens according to claim 1, characterized in that, The lens set further comprises a first spacer element and a third spacer element, the first spacer element at least partially abutting the image-side surface of the first lens, and the third spacer element at least partially abutting the image-side surface of the third lens; the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the distance EP13 along the optical axis from the image-side surface of the first spacer element to the object-side surface of the third spacer element satisfy: 1.5≤(f2+f3) / EP13≤6.

30.

5. The imaging lens according to claim 1, characterized in that, The lens set further comprises a third spacer element, the third spacer element at least partially abutting the image-side surface of the third lens; the effective focal length f3 of the third lens, the central thickness CT3 of the third lens, and the maximum thickness CP3 of the third spacer element satisfy: 18.16≤f3 / (CT3+CP3)≤41.

95.

6. The imaging lens according to claim 1, characterized in that, The lens set further comprises a fifth spacer element, the fifth spacer element at least partially abutting the image-side surface of the fifth lens; the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, the central thickness CT5 of the fifth lens, and the distance EP45 along the optical axis from the image-side surface of the fourth spacer element to the object-side surface of the fifth spacer element satisfy: -156.95≤(R8+R9) / (EP45-CT5)≤-38.

38.

7. The imaging lens according to claim 1, characterized in that, The lens set further comprises a first spacer element, the first spacer element at least partially abutting the image-side surface of the first lens; the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the outer diameter D1m of the image-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element satisfy: 1.39≤(R2-R1) / (D1m-d1s)≤3.

34.

8. The imaging lens according to claim 1, characterized in that, The lens set further comprises a sixth spacer element, the sixth spacer element at least partially abutting the image-side surface of the sixth lens; the effective focal length f6 of the sixth lens, the inner diameter d0m of the image-side end surface of the lens barrel, and the minimum inner diameter d6 of the sixth spacer element satisfy: -8.06≤f6 / (d0m-d6)≤-1.

48.

9. The imaging lens according to claim 1, characterized in that, The lens set further comprises a first spacer element and a third spacer element, the first spacer element at least partially abutting the image-side surface of the first lens, and the third spacer element at least partially abutting the image-side surface of the third lens; the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the distance EP13 along the optical axis from the image-side surface of the first spacer element to the object-side surface of the third spacer element, and the air gap T23 on the optical axis between the second lens and the third lens satisfy: 1.83≤(f2+f3) / (EP13-T23)≤8.

27.

10. The imaging lens according to claim 1, characterized in that, The lens set further comprises a third spacer element at least partially abutting the image-side surface of the third lens; a radius of curvature R5 of the object-side surface of the third lens, a radius of curvature R6 of the image-side surface of the third lens, an outer diameter D3s of the object-side surface of the third spacer element, and an inner diameter d3s of the object-side surface of the third spacer element satisfy: 2.48≤|R5+R6| / (D3s+d3s)≤23.

42.

11. The imaging lens according to claim 1, characterized in that, The lens set further comprises a first spacer element at least partially abutting the image-side surface of the first lens; an inner diameter d0m of the image-side end surface of the lens barrel, an outer diameter D1s of the object-side surface of the first spacer element, a maximum half field of view Semi-FOV of the imaging lens, and a distance Td from the object-side surface of the first lens to the image-side of the sixth lens along the optical axis satisfy: 0.85≤TAN(Semi-FOV) / ((d0m-D1s) / Td)≤1.

55.

12. The imaging lens according to claim 1, characterized in that, The fifth lens has positive refractive power, the lens set further comprises a third spacer element at least partially abutting the image-side surface of the third lens; an effective focal length f5 of the fifth lens, a center thickness CT4 of the fourth lens, an air separation T45 between the fourth and fifth lenses along the optical axis, and a distance EP34 from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element along the optical axis satisfy: 10.94≤f5 / (CT4+T45-EP34)≤18.81.

Images