Imaging lens

Abstract

The application relates to an imaging lens, comprising a lens barrel, a lens set and a plurality of spacer elements assembled in the lens barrel, the lens set comprising a first lens, a second lens, a third lens and a fourth lens, the plurality of spacer elements comprising a first spacer element arranged between the first lens and the second lens and abutting an image-side surface of the first lens, a second spacer element arranged between the second lens and the third lens and abutting an image-side surface of the second lens, and a third spacer element arranged between the third lens and the fourth lens and abutting an image-side surface of the third lens, the second lens being a super lens and the image-side surface of the second lens being a super surface, and the imaging lens further satisfying 2.35 < f2 / (D2s-d2s) < 4.95 and 0.85 < CT2 / (EP12+CP2) < 1.25.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and in particular to an imaging lens suitable for mobile devices. Background Technology

[0002] With the rapid development and market penetration of foldable phones, smartphone imaging systems are facing unprecedented technological innovation. In this emerging field, the design philosophy of traditional lens modules is undergoing fundamental changes. Due to the unique mechanical structure and space constraints of foldable phones, more stringent requirements are placed on optical lenses: they must not only maintain excellent image quality but also achieve extreme miniaturization and thinness. It is worth noting that while pursuing thinness and lightness, consumers' demand for high image quality has not diminished, which brings even greater challenges to optical design.

[0003] One of the challenges in miniaturizing lenses is maintaining stability during lens assembly. Miniaturization means reducing the thickness of the lens, especially at the edges, which leads to a decrease in the structural strength of the lens and a risk of breakage. Excessive edge deformation of the lens can also alter its shape and affect the lens's optical performance. Summary of the Invention

[0004] Given the problem of insufficient assembly stability in the miniaturization process of existing lenses, which affects their optical performance, it is necessary to provide an imaging lens.

[0005] This application provides an imaging lens, which includes a lens barrel and a lens group and a plurality of spacer elements assembled inside the lens barrel;

[0006] The lens group, from the object side to the image side, includes, in sequence: a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with negative optical power.

[0007] The plurality of spacers include: a first spacer, a second spacer, and a third spacer, wherein the first spacer is located between the first lens and the second lens and abuts against the image side of the first lens, the second spacer is located between the second lens and the third lens and abuts against the image side of the second lens, and the third spacer is located between the third lens and the fourth lens and abuts against the image side of the third lens.

[0008] The second lens is a superlens, and the image-side surface of the second lens is a metasurface; and

[0009] The imaging lens satisfies: 2.35 < f2 / (D2s-d2s) < 4.95, 0.85 < CT2 / (EP12+CP2) < 1.25, wherein f2 is an effective focal length of the second lens, D2s is an outer diameter of the second spacer element object side surface, d2s is an inner diameter of the second spacer element object side surface, CT2 is a central thickness of the second lens on the optical axis, EP12 is a distance along the optical axis direction from the first spacer element image side surface to the second spacer element object side surface, and CP2 is a maximum thickness of the second spacer element along the optical axis direction.

[0010] In some embodiments of the application, the metasurface comprises a substrate and a microstructure formed on the substrate, a surface of the substrate is a plane, and the substrate is a glass piece.

[0011] In some embodiments of the application, the imaging lens satisfies: 1.35 < L / MD < 1.60; wherein L is a maximum height from the lens barrel object side surface to the lens barrel image side surface, and MD is an on-axis distance from the second lens image side surface to the fourth lens image side surface.

[0012] In some embodiments of the application, the imaging lens satisfies: 1.50 < (D0m-d0s) / f < 2.05; wherein D0m is an outer diameter of the lens barrel image side surface, d0s is an inner diameter of the lens barrel object side surface, and f is a system focal length of the imaging lens.

[0013] In some embodiments of the application, the imaging lens satisfies: 1.20 < (EP23+CP3) / T23 < 1.65; wherein EP23 is a distance along the optical axis direction from the second spacer element image side surface to the third spacer element object side surface, CP3 is a maximum thickness of the third spacer element along the optical axis direction, and T23 is an air gap of the second lens and the third lens on the optical axis.

[0014] In some embodiments of the application, the imaging lens satisfies: 5.50 ≤ d1s / T12 ≤ 7.81; wherein d1s is an inner diameter of the first spacer element object side surface, and T12 is an air gap of the first lens and the second lens on the optical axis.

[0015] In some embodiments of the application, the imaging lens satisfies: 1.55 < R1 / EP01 < 2.0; wherein R1 is a radius of curvature of the first lens object side surface, and EP01 is a distance along the optical axis direction from the lens barrel object side surface to the first spacer element object side surface.

[0016] In some embodiments of the application, the imaging lens satisfies: 3.1 < R3 / d1m < 3.75; where R3 is the radius of curvature of the object side surface of the second lens, and d1m is the inner diameter of the image side surface of the first spacer element.

[0017] In some embodiments of the application, the imaging lens satisfies: -3.55 < f4 / d0m < -2.05; where f4 is the effective focal length of the fourth lens, and d0m is the inner diameter of the image side surface of the lens barrel.

[0018] In some embodiments of the application, the imaging lens satisfies: 1.1 < (D1s+D1m) / f1 < 1.4; where D1s is the outer diameter of the object side surface of the first spacer element, D1m is the outer diameter of the image side surface of the first spacer element, and f1 is the effective focal length of the first lens.

[0019] In some embodiments of the application, the imaging lens satisfies: 4.21 ≤ d3m / (CT3+T34) ≤ 5.20; where d3m is the inner diameter of the image side surface of the third spacer element, CT3 is the central thickness of the third lens on the optical axis, and T34 is the air separation of the third lens and the fourth lens on the optical axis.

[0020] In some embodiments of the application, the imaging lens satisfies: 1.65 < (D1m+D3m) / D2m < 2.2; where D1m is the outer diameter of the image side surface of the first spacer element, D2m is the outer diameter of the image side surface of the second spacer element, and D3m is the outer diameter of the image side surface of the third spacer element.

[0021] In some embodiments of the application, the imaging lens satisfies: -7.15 < f3 / (d3s+D3s) < -3.6; where f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side surface of the third spacer element, and D3s is the outer diameter of the object side surface of the third spacer element.

[0022] In some embodiments of the application, the imaging lens satisfies: 2.05 < D0s / ∑CT < 2.65; where D0s is the outer diameter of the object side surface of the lens barrel, and ∑CT is the sum of the central thicknesses of the first lens, the second lens, the third lens, and the fourth lens on the optical axis.

[0023] In some embodiments of the application, the imaging lens satisfies: 4.00 mm ≤ d2m × (V2 / V3) ≤ 4.98 mm; where d2m is the inner diameter of the image side surface of the second spacer element, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.

[0024] In summary, this application sets the image-side surface of the second lens as a metasurface. While reducing the overall height of the imaging lens and effectively improving overall performance and chromatic aberration, the strength of the second lens itself and the surface shape changes during assembly have a significant impact on performance. When the conditional expressions f2 / (D2s-d2s) and CT2 / (EP12+CP2) are small, a larger actual bearing misalignment and a larger step difference will occur between the second and third lenses, resulting in a greater change in the surface shape of the second lens and thus a deterioration in performance. When the conditional expressions f2 / (D2s-d2s) and CT2 / (EP12+CP2) are large, the actual bearing area of ​​the second and third lenses decreases, thus reducing the force-bearing surface. The change in the surface shape of the second lens will also increase, and the structural strength of the second lens will decrease accordingly. The deformation after assembly will increase, which will have a significant impact on the performance of the imaging lens. Therefore, by ensuring that the imaging lens satisfies 2.35 < f2 / (D2s-d2s) < 4.95 and 0.85 < CT2 / (EP12+CP2) < 1.25, this application can effectively guarantee the reasonable bearing length between the second lens and the first and second spacers, and ensure the variation, strength and performance stability of the second lens. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structural parameters of an imaging lens according to one embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the imaging lens according to Embodiment 1 of this application;

[0027] Figure 3 This is a schematic diagram of the imaging lens according to Embodiment 2 of this application;

[0028] Figure 4 This is a schematic diagram of the imaging lens according to Embodiment 3 of this application;

[0029] Figure 5A A schematic diagram of the on-axis chromatic aberration curves of the imaging lenses according to the above-described Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0030] Figure 5B A schematic diagram of the astigmatism curves of the imaging lenses according to the above-described Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown.

[0031] Figure 5C The diagram shows the distortion curves of the imaging lenses according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application.

[0032] Figure 6 This is a schematic diagram of the imaging lens according to Embodiment 4 of this application;

[0033] Figure 7 is a structural diagram of an imaging lens according to Embodiment Five of the present application;

[0034] Figure 8 is a structural diagram of an imaging lens according to Embodiment Six of the present application;

[0035] Figure 9A shows an on-axis chromatic aberration curve diagram of the imaging lens according to the above-mentioned Embodiment Four, the above-mentioned Embodiment Five and the above-mentioned Embodiment Six of the present application;

[0036] Figure 9B shows an astigmatism curve diagram of the imaging lens according to the above-mentioned Embodiment Four, the above-mentioned Embodiment Five and the above-mentioned Embodiment Six of the present application;

[0037] Figure 9C shows a distortion curve diagram of the imaging lens according to the above-mentioned Embodiment Four, the above-mentioned Embodiment Five and the above-mentioned Embodiment Six of the present application;

[0038] Figure 10 is a structural diagram of an imaging lens according to Embodiment Seven of the present application;

[0039] Figure 11 is a structural diagram of an imaging lens according to Embodiment Eight of the present application;

[0040] Figure 12 is a structural diagram of an imaging lens according to Embodiment Nine of the present application;

[0041] Figure 13A shows an on-axis chromatic aberration curve diagram of the imaging lens according to the above-mentioned Embodiment Seven, the above-mentioned Embodiment Eight and the above-mentioned Embodiment Nine of the present application;

[0042] Figure 13B shows an astigmatism curve diagram of the imaging lens according to the above-mentioned Embodiment Seven, the above-mentioned Embodiment Eight and the above-mentioned Embodiment Nine of the present application;

[0043] Figure 13C shows a distortion curve diagram of the imaging lens according to the above-mentioned Embodiment Seven, the above-mentioned Embodiment Eight and the above-mentioned Embodiment Nine of the present application;

[0044] Figure 14 shows an edge deformation cloud diagram of the second lens in the imaging lens when the imaging lens satisfies f2 / (D2s-d2s)=3.86 and CT2 / (EP12+CP2)=1.02;

[0045] Figure 15 shows an edge deformation cloud diagram of the second lens in the imaging lens when the imaging lens satisfies f2 / (D2s-d2s)=2.03 and CT2 / (EP12+CP2)=0.65;

[0046] Figure 16 An edge distortion map of the second lens in the imaging lens is shown when the imaging lens satisfies f2 / (D2s-d2s)=5.21 and CT2 / (EP12+CP2)=1.93.

[0047] Reference Signs:

[0048] E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, filter; P0, lens barrel; P1, first spacer element; P2, second spacer element; P3, third spacer element. DETAILED DESCRIPTION

[0049] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed description are only examples of illustrative embodiments of the present application and are not intended to limit the scope of the present application in any way. Identical reference numerals in the entire description denote the same elements throughout. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] It is to be noted that the expressions first, second, third and the like in the present specification merely distinguish one feature from another but do not denote any limitation on the features. Thus, 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.

[0051] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. 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 to scale.

[0052] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be made in accordance with the general method in the art, for example, judging convexity or concavity by the sign of R value (R refers to the radius of curvature in the paraxial region). In the present specification, the surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens. In terms of the object side surface, 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. In terms of the image side surface, 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.

[0053] It should also be understood that the use of the terms "including", "including having", "having", "containing", and / or "containing having" when used in this specification, specifies the presence of stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when expressions such as "at least one of" appear after a list of items, it modifies the entire list of items and not the individual items in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0054] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0055] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The following embodiments only express several embodiments of the present application, which are described in detail and specifically, but can not be interpreted as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0056] Please refer to Figure 1 , Figure 1 A parameter diagram of an imaging lens provided by the present application is provided.

[0057] As Figure 1 shown, the present application provides an imaging lens, which comprises a lens barrel P0 and a lens group and a plurality of spacing elements assembled in the lens barrel P0;

[0058] The lens group comprises, in order from the object side to the image side: a first lens E1 with positive refractive power, a second lens E2 with positive refractive power, a third lens E3 with negative refractive power, and a fourth lens E4 with negative refractive power;

[0059] The plurality of spacer elements comprises a first spacer element P1, a second spacer element P2 and a third spacer element P3, wherein the first spacer element P1 is located between the first lens E1 and the second lens E2 and abuts the image side surface of the first lens E1, the second spacer element P2 is located between the second lens E2 and the third lens E3 and abuts the image side surface of the second lens E2, and the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and abuts the image side surface of the third lens E3;

[0060] The second lens E2 is a super lens, and the image side surface of the second lens E2 is a super surface.

[0061] The imaging lens satisfies 2.35 < f2 / (D2s-d2s) < 4.95 and 0.85 < CT2 / (EP12+CP2) < 1.25, wherein f2 is the effective focal length of the second lens E2, D2s is the outer diameter of the object side surface of the second spacer element P2, d2s is the inner diameter of the object side surface of the second spacer element P2, CT2 is the central thickness of the second lens E2 on the optical axis, EP12 is the distance between the image side surface of the first spacer element P1 and the object side surface of the second spacer element P2 along the optical axis, and CP2 is the maximum thickness of the second spacer element P2 along the optical axis.

[0062] It is worth noting that in the present application, the image side surface of the second lens E2 is set as a super surface. In the case of reducing the overall height of the imaging lens and effectively improving the overall performance and color edge, the strength of the second lens E2 itself and the surface profile change in the assembly process have a greater impact on the performance. When the condition f2 / (D2s-d2s) and CT2 / (EP12+CP2) are small, a larger actual supporting misalignment and a larger step difference between the second lens E2 and the third lens E3 will occur, the surface profile change of the second lens E2 will be larger, resulting in poor performance. When the condition f2 / (D2s-d2s) and CT2 / (EP12+CP2) are large, the actual supporting area of the second lens E2 and the third lens E3 is reduced, so the stress surface is reduced, the surface profile change of the second lens E2 will also be larger, and the structural strength of the second lens E2 will also be smaller accordingly, and the deformation amount after assembly will be larger, which has a greater impact on the performance of the imaging lens. Therefore, by making the imaging lens satisfy 2.35 < f2 / (D2s-d2s) < 4.95 and 0.85 < CT2 / (EP12+CP2) < 1.25, the reasonable supporting length of the second lens E2 and the first spacer element P1 and the second spacer element P2 can be effectively guaranteed, and the change amount, strength and performance stability of the second lens E2 can be guaranteed.

[0063] For example, as shown in Figure 14 , Figure 15 and Figure 16 ,Figure 14 An edge distortion cloud chart of the second lens E2 in the imaging lens is shown when the imaging lens satisfies f2 / (D2s-d2s)=3.86 and CT2 / (EP12+CP2)=1.02, Figure 15 An edge distortion cloud chart of the second lens E2 in the imaging lens is shown when the imaging lens satisfies f2 / (D2s-d2s)=2.03 and CT2 / (EP12+CP2)=0.65, Figure 16 An edge distortion cloud chart of the second lens E2 in the imaging lens is shown when the imaging lens satisfies f2 / (D2s-d2s)=5.21 and CT2 / (EP12+CP2)=1.93. Figure 14 The distortion range of the second lens E2 in the imaging lens is -0.0010573mm~0.00012613mm, Figure 15 The distortion range of the second lens E2 in the imaging lens is -0.0040906mm~0.0002418mm, Figure 16 The distortion range of the second lens E2 in the imaging lens is -0.021712mm~0.034806mm, and it can be seen that when the imaging lens satisfies 2.35

[0064] In some embodiments of the present application, the metasurface comprises a substrate and a microstructure formed on the substrate, the surface of the substrate is a plane, and the substrate is a glass piece.

[0065] In this way, since the imaging lens provided by the present application adopts a metasurface, compared with a conventional 4-piece lens, the height can be further reduced on the basis of ensuring equivalent performance, so that the lens is thinned and miniaturized.

[0066] According to some embodiments of the present application, the imaging lens satisfies: 1.35

[0067] In this way, the conditional expression range is reasonably controlled, the thickness and air gap of the third lens E3 and the fourth lens E4 are reasonably distributed, and the strength and stability of the lens performance of the second lens E2 are ensured.

[0068] According to some embodiments of the application, the imaging lens satisfies: 1.50 < (D0m-d0s) / f < 2.05; wherein D0m is the outer diameter of the image side of the lens barrel P0, d0s is the inner diameter of the object side of the lens barrel P0, and f is the system focal length of the imaging lens.

[0069] In this way, the conditional expression range is reasonably controlled, the thickness and air gap of the third lens E3 and the fourth lens E4 are reasonably distributed, and the strength and stability of the lens performance of the second lens E2 are ensured.

[0070] According to some embodiments of the application, the imaging lens satisfies: 1.20 < (EP23+CP3) / T23 < 1.65; wherein EP23 is the distance along the optical axis from the image side of the second spacer element P2 to the object side of the third spacer element P3, CP3 is the maximum thickness of the third spacer element P3 along the optical axis, and T23 is the air gap of the second lens E2 and the third lens E3 along the optical axis.

[0071] In this way, the conditional expression range is reasonably controlled, the strength of the third lens E3 and the third spacer element P3 is high, and the change in the air gap of the second lens E2 and the third lens E3 during assembly can be effectively ensured, and the stability of the performance is ensured.

[0072] According to some embodiments of the application, the imaging lens satisfies: 5.50 ≤ d1s / T12 ≤ 7.81; wherein d1s is the inner diameter of the object side of the first spacer element P1, and T12 is the air gap of the first lens E1 and the second lens E2 along the optical axis.

[0073] In this way, the conditional expression range is reasonably controlled, the strength of the third lens E3 and the third spacer element P3 is high, and the change in the air gap of the second lens E2 and the third lens E3 during assembly can be effectively ensured, and the stability of the performance is ensured.

[0074] According to some embodiments of the application, the imaging lens satisfies: 1.55 < R1 / EP01 < 2.0; wherein R1 is the curvature radius of the object side of the first lens E1, and EP01 is the distance along the optical axis from the object side of the lens barrel P0 to the object side of the first spacer element P1.

[0075] In this way, due to the thickness of the head of the lens barrel P0 and the thickness of the first lens E1 guaranteed by EP01, by controlling the ratio of R1 / EP01, on the one hand, the thickness of the front end of the lens barrel P0 is controlled to guarantee stability in the assembly process, and on the other hand, the machinability and strength of the first lens E1 are guaranteed, and the performance of the lens is stable.

[0076] According to some embodiments of the present application, the imaging lens satisfies: 3.1 < R3 / d1m < 3.75; wherein R3 is the curvature radius of the object side surface of the second lens E2, and d1m is the inner diameter of the image side surface of the first spacer element P1.

[0077] In this way, due to the green arc stray light of the second lens E2 which is more likely to generate internal reflection, by controlling the ratio of R3 / d1m, part of the light is blocked by the first spacer element P1, so that the stray light is weakened, and the imaging quality of the lens is improved.

[0078] According to some embodiments of the present application, the imaging lens satisfies: -3.55 < f4 / d0m < -2.05; wherein f4 is the effective focal length of the fourth lens E4, and d0m is the inner diameter of the image side surface of the lens barrel P0.

[0079] In this way, by controlling the ratio of f4 / d0m, the maximum range of light after passing through the fourth lens E4 can be effectively guaranteed, so that the risk of invalid light hitting the rear end of the lens barrel P0 is reduced, and the haze treatment of the rear end of the lens barrel P0 effectively improves such stray light, and guarantees the clarity of the imaging picture.

[0080] According to some embodiments of the present application, the imaging lens satisfies: 1.1 < (D1s+D1m) / f1 < 1.4; wherein D1s is the outer diameter of the object side surface of the first spacer element P1, D1m is the outer diameter of the image side surface of the first spacer element P1, and f1 is the effective focal length of the first lens E1.

[0081] In this way, by controlling the ratio of (D1s+D1m) / f1, the outer diameter and the medium thickness of the first lens E1 are guaranteed, and when the ratio of the outer diameter and the medium thickness meets the specification, it is beneficial to the molding and processing of the first lens E1, and is also a key to improving the performance of the lens.

[0082] According to some embodiments of the present application, the imaging lens satisfies: 4.21 ≤ d3m / (CT3+T34) ≤ 5.20; wherein d3m is the inner diameter of the image side surface of the third spacer element P3, CT3 is the center thickness of the third lens E3 on the optical axis, and T34 is the air gap between the third lens E3 and the fourth lens E4 on the optical axis.

[0083] In this way, since the gap between the third lens E3 and the fourth lens E4 is large, a metal spacer is added therebetween, and on the basis of sufficient bearing length, the stability of the gap can be effectively ensured, and the performance field curvature is stable.

[0084] According to some embodiments of the present application, the imaging lens satisfies: 1.65 < (D1m+D3m) / D2m < 2.2; wherein D1m is the outer diameter of the image side surface of the first spacer element P1, D2m is the outer diameter of the image side surface of the second spacer element P2, and D3m is the outer diameter of the image side surface of the third spacer element P3.

[0085] In this way, on the basis of ensuring the lens shape and the barrel thickness P0, the step difference of the second lens E2, the third lens E3 and the fourth lens E4 is significantly increased, and by controlling the ratio of (D1m+D3m) / D2m, the step difference during lens assembly can be effectively ensured, and the lens face shape change is small, which obviously improves the lens performance.

[0086] According to some embodiments of the present application, the imaging lens satisfies: -7.15 < f3 / (d3s+D3s) < -3.6; wherein f3 is the effective focal length of the third lens E3, d3s is the inner diameter of the object side surface of the third spacer element P3, and D3s is the outer diameter of the object side surface of the third spacer element P3.

[0087] In this way, in order to ensure the assembly stability, a metal spacer is usually added between the third lens E3 and the fourth lens E4, but when the gap is too small and the metal spacer is too thin, the processability and deformation cannot be controlled, so the third lens E3 is used for auxiliary bearing to ensure the assembly, but the stray light at the third lens E3 is relatively serious, so by reasonably restricting the ratio of f3 / (d3s+D3s), the related light rays directly shooting to the image plane after passing through the third lens E3 are blocked, the stray light is reduced, and the imaging quality is ensured.

[0088] According to some embodiments of the present application, the imaging lens satisfies: 2.05 < D0s / ∑CT < 2.65; wherein D0s is the outer diameter of the object side surface of the barrel P0, and ∑CT is the sum of the center thicknesses of the first lens E1, the second lens E2, the third lens E3 and the fourth lens E4 on the optical axis.

[0089] In this way, by controlling the ratio of D0s / ∑CT, the outer diameter of the lens can be controlled, the medium thickness of the first lens E1 to the fourth lens E4 is reasonably distributed, and the processability of each lens is ensured.

[0090] According to some embodiments of the present application, the imaging lens satisfies: 4.00mm≤d2m×(V2 / V3)≤4.98mm, where d2m is the inner diameter of the image side surface of the second spacer element P2, V2 is the Abbe number of the second lens E2, and V3 is the Abbe number of the third lens E3.

[0091] In this way, since the second lens E2 and the third lens E3 are more likely to generate stray light, the inner diameter of the second spacer element P2 is controlled by the ratio of d2m×(V2 / V3) to block the stray light.

[0092] According to another aspect of the present application, the present application provides an imaging lens, comprising a lens barrel P0 and a lens group and a plurality of spacer elements assembled in the lens barrel P0.

[0093] The lens group sequentially comprises, from the object side to the image side: a first lens E1 with positive refractive power, a second lens E2 with positive refractive power, a third lens E3 with negative refractive power, and a fourth lens E4 with negative refractive power.

[0094] The plurality of spacer elements comprises: a first spacer element P1, a second spacer element P2, and a third spacer element P3, wherein the first spacer element P1 is located between the first lens E1 and the second lens E2 and abuts against the image side surface of the first lens E1, the second spacer element P2 is located between the second lens E2 and the third lens E3 and abuts against the image side surface of the second lens E2, and the third spacer element P3 is located between the third lens E3 and the fourth lens E4 and abuts against the image side surface of the third lens E3.

[0095] The second lens E2 is a super lens, and the image side surface of the second lens E2 is a super surface; and

[0096] The imaging lens satisfies: -7.15

[0097] In summary, to ensure assembly stability, a metal spacer is usually added between the third lens E3 and the fourth lens E4. However, when the gap is too small and the metal spacer is too thin, the manufacturability and deformation cannot be controlled. Therefore, the third lens E3 is used for auxiliary support. By constraining the imaging lens with -7.15 < f3 / (d3s+D3s) < -3.6 and 0.85 < CT2 / (EP12+CP2) < 1.25, the overall length of the lens can be further reduced while ensuring assembly stability. This allows the front lens to meet the shooting requirements while having a smaller lens size and thinner thickness in the optical axis direction. At the same time, it also leaves enough space for the motor, reduces the motor load, and helps to improve product competitiveness and ensure image quality.

[0098] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the imaging lens can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, as needed, the imaging lens may also include other numbers of spacers than those described in the above embodiments.

[0099] The following describes in more detail some specific, non-limiting embodiments of the above-described embodiments of this application with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane of the imaging lens, STO represents the surface of the aperture stop, S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, S9 represents the object-side plane of the filter E5, S10 represents the image-side plane of the filter E5, and S11 represents the image plane.

[0100] Example 1

[0101] like Figure 2 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacers mounted within the lens barrel P0. The lens group includes, in sequence from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The plurality of spacers include: a first spacer P1 positioned between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1; a second spacer P2 positioned between the second lens E2 and the third lens E3 and abutting against the image side of the second lens E2; and a third spacer P3 positioned between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3.

[0102] In this embodiment, the first lens E1 has positive refractive power, the object side surface of the first lens E1 is convex, and the image side surface of the first lens E1 is concave; the second lens E2 has positive refractive power, the object side surface of the second lens E2 is convex, and the image side surface of the second lens E2 is planar and is a super surface; the third lens E3 has negative refractive power, the object side surface of the third lens E3 is concave, and the image side surface of the third lens E3 is convex; and the fourth lens E4 has negative refractive power, the object side surface of the fourth lens E4 is convex, and the image side surface of the fourth lens E4 is concave.

[0103] In addition, Table 1 shows the basic optical parameters of the imaging lens of Embodiment One, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0104] Table 1: Optical parameter table of the imaging lens in Embodiment One

[0105]

[0106] In this embodiment, the object side surface and the image side surface of any one of the first lens E1, the third lens E3, and the fourth lens E4 are aspherical surfaces, and the object side surface of the second lens E2 is an aspherical surface. The surface type x of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0107] ;

[0108] wherein x is the sag of the aspherical surface at a height h along the optical axis, c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the 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. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical surfaces S1 to S3 and S5 to S8 in Embodiment One are given in Table 2-1 and Table 2-2 below.

[0109] Table 2-1: Aspherical surface coefficient table of the imaging lens in Embodiment One

[0110]

[0111] Table 2-2: Aspherical surface coefficient table of the imaging lens in Embodiment One

[0112]

[0113] In this embodiment, the image side surface of the second lens E2 is a super surface, which can be defined by, but is not limited to, the following super surface phase equation:

[0114] ;

[0115] wherein φ(r) is a phase profile, d is a diffraction order, λ0is a reference wavelength, r is a radial coordinate, Ciis a metasurface phase equation coefficient, i = 1, 2, 3, 4, 5.

[0116] The following Table 3 gives the coefficient values of the metasurface phase equation applicable to S4 in this embodiment.

[0117] Table 3: Metasurface phase equation coefficient table of the imaging lens in Embodiment One

[0118]

[0119] Embodiment Two

[0120] As Figure 3 shown in this embodiment, the imaging lens comprises a lens barrel P0and a plurality of lens groups and a plurality of spacer elements assembled in the lens barrel P0, the lens groups sequentially comprise, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4; the plurality of spacer elements comprise: a first spacer element P1disposed between the first lens E1and the second lens E2and abutting against the image side of the first lens E1, a second spacer element P2disposed between the second lens E2and the third lens E3and abutting against the image side of the second lens E2, and a third spacer element P3disposed between the third lens E3and the fourth lens E4and abutting against the image side of the third lens E3.

[0121] It is worth noting that, compared with the above-mentioned Embodiment One, the imaging lens of this embodiment has the same optical parameters, i.e., the basic optical parameter table of the imaging lens of this embodiment is the same as Table 1, the aspherical coefficient table is the same as Table 2-1 and Table 2-2, and the phase equation coefficient is the same as Table 3. However, the imaging lens of this embodiment and the imaging lens of the above-mentioned Embodiment One have different structural parameters, i.e., the difference between this embodiment and the above-mentioned Embodiment One lies in that the size values of some structural parameters of the lens barrel P0and the spacer elements in the imaging lens are different.

[0122] Specifically, the values of each relevant structural parameter in this embodiment and the above-mentioned Embodiment One are shown in the following Table 11, and it can be understood that the units of the values of each parameter shown in Table 11 are millimeters (mm), and the schematic of each parameter in the structural diagram of the imaging lens is shown in Figure 1 .

[0123] Embodiment Three

[0124] As Figure 4As shown in the embodiment, the imaging lens comprises a lens barrel P0 and a plurality of lens groups and a plurality of spacer elements assembled in the lens barrel P0, the lens groups comprise, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprise: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting against the image side of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3.

[0125] It is worth noting that, compared with the above-mentioned embodiment one, the imaging lens of the embodiment three has the same optical parameters, i.e., the basic optical parameter table of the imaging lens of the embodiment three is the same as Table 1, the aspherical surface coefficient table is the same as Table 2-1 and Table 2-2, and the phase equation coefficient is the same as Table 3. However, the imaging lens of the embodiment three and the imaging lens of the above-mentioned embodiment one have different structural parameters, i.e., the embodiment three and the above-mentioned embodiment one are different in that the size values of some structural parameters of the lens barrel P0 and the spacer elements in the imaging lens are different.

[0126] Specifically, the values of each related structural parameter in the embodiment three and the above-mentioned embodiment one are shown in Table 11 below, and it can be understood that the units of the values of each parameter shown in Table 11 are millimeters (mm), and the schematic representation of each parameter in the structural diagram of the imaging lens is shown in Figure 1 .

[0127] The on-axis chromatic aberration curves of the imaging lenses in the embodiment one, the embodiment two and the embodiment three are shown in Figure 5A , which represent the convergence focus deviation of light rays of different wavelengths after passing through the imaging lens; the astigmatism curves of the imaging lenses in the embodiment one, the embodiment two and the embodiment three are shown in Figure 5B , which represent the meridional image surface curvature and sagittal image surface curvature, and the distortion curves of the imaging lenses in the embodiment one, the embodiment two and the embodiment three are shown in Figure 5C , which represent the relative deviation degree of the actual image of the imaging lens and the ideal image. According to Figure 5A , Figure 5B and Figure 5C , it can be known that the imaging lenses in the embodiment one, the embodiment two and the embodiment three can all achieve good imaging quality.

[0128] Embodiment Four

[0129] As shown in Figure 6 , the imaging lens comprises a lens barrel P0 and a plurality of lens groups and a plurality of spacer elements assembled in the lens barrel P0, the lens groups comprise, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprise: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting against the image side of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3.As shown, in this embodiment, the imaging lens comprises a lens barrel P0 and a plurality of lens groups and a plurality of spacer elements assembled in the lens barrel P0, the lens groups comprise, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprise: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting the image side of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting the image side of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting the image side of the third lens E3.

[0130] In this embodiment, the first lens E1 has positive refractive power, the object side of the first lens E1 is convex, and the image side of the first lens E1 is concave; the second lens E2 has positive refractive power, the object side of the second lens E2 is convex, and the image side of the second lens E2 is planar and is a super surface; the third lens E3 has negative refractive power, the object side of the third lens E3 is concave, and the image side of the third lens E3 is convex; and the fourth lens E4 has negative refractive power, the object side of the fourth lens E4 is convex, and the image side of the fourth lens E4 is concave.

[0131] In addition, Table 4 shows the basic optical parameters of the imaging lens of Embodiment Four, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0132] Table 4: Optical parameter table of the imaging lens of Embodiment Four

[0133]

[0134] In this embodiment, the object side and the image side of any one of the first lens E1, the third lens E3 and the fourth lens E4 are aspherical surfaces, and the object side of the second lens E2 is an aspherical surface, and the surface type x of each aspherical lens can be defined by, but not limited to, the aspherical formula in Embodiment One.

[0135] The following Tables 5-1 and 5-2 give the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for the aspherical surfaces S1 to S3, S5 to S8 in Embodiment Four.

[0136] Table 5-1: Aspherical coefficient table of the imaging lens in Embodiment Four

[0137]

[0138] Table 5-2: Aspherical coefficient table of the imaging lens in Embodiment Four

[0139]

[0140] In this embodiment, the image side surface of the second lens E2 is a metasurface, which can be defined by the metasurface phase equation in Embodiment One, but is not limited thereto.

[0141] The following Table 6 gives the coefficient values of the metasurface phase equation applicable to S4 in this embodiment.

[0142] Table 6: Metasurface phase equation coefficient table of the imaging lens in Embodiment Four

[0143]

[0144] Embodiment Five

[0145] As Figure 7 shown in the figure, in this embodiment, the imaging lens comprises a lens barrel P0 and a lens group and a plurality of spacer elements assembled in the lens barrel P0, the lens group comprises, in order from the object side surface to the image side surface: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprises: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side surface of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting against the image side surface of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side surface of the third lens E3.

[0146] It is worth noting that, compared with the above-mentioned Embodiment Four, the imaging lens of this embodiment has the same optical parameters, i.e., the basic optical parameter table of the imaging lens of this embodiment is the same as Table 4, the aspherical coefficient table is the same as Table 5-1 and Table 5-2, and the phase equation coefficient is the same as Table 6. While the imaging lens of this embodiment and the imaging lens of the above-mentioned Embodiment Four have different structural parameters, i.e., the difference between this embodiment and the above-mentioned Embodiment Four lies in that the size values of some structural parameters of the lens barrel P0 and the spacer elements in the imaging lens are different.

[0147] Specifically, the values of each relevant structural parameter in this embodiment and the above-mentioned Embodiment Four are shown in Table 11 below, and it can be understood that the units of the values of each parameter shown in Table 11 are millimeters (mm), and the schematic of each parameter in the structural diagram of the imaging lens is shown in Figure 1 .

[0148] Embodiment Six

[0149] As Figure 8As shown in the embodiment, the imaging lens comprises a lens barrel P0 and a plurality of lens groups and a plurality of spacer elements assembled in the lens barrel P0, the lens groups comprise, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprise: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting against the image side of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3.

[0150] It is worth noting that, compared with the above-mentioned embodiment four, the imaging lens of the embodiment six has the same optical parameters, i.e., the basic optical parameter table of the imaging lens of the embodiment six is the same as Table 4, the aspherical surface coefficient table is the same as Table 5-1 and Table 5-2, and the phase equation coefficient is the same as Table 6. While the imaging lens of the embodiment six and the imaging lens of the above-mentioned embodiment four have different structural parameters, i.e., the embodiment six and the above-mentioned embodiment four are different in that the size values of some structural parameters of the lens barrel P0 and the spacer elements in the imaging lens are different.

[0151] Specifically, the values of each related structural parameter in the embodiment six and the above-mentioned embodiment four are shown in Table 11 below, respectively. It can be understood that the units of the values of each parameter shown in Table 11 are millimeters (mm), and the schematic representation of each parameter in the structural diagram of the imaging lens is shown in Figure 1 .

[0152] The on-axis chromatic aberration curves of the imaging lenses in the embodiment four, the embodiment five and the embodiment six are shown in Figure 9A , which represent the degree of deflection of the converging focus points of light rays of different wavelengths after passing through the imaging lens; the astigmatism curves of the imaging lenses in the embodiment four, the embodiment five and the embodiment six are shown in Figure 9B , which represent the meridional image surface curvature degree and the sagittal image surface curvature degree; the distortion curves of the imaging lenses in the embodiment four, the embodiment five and the embodiment six are shown in Figure 9C , which represent the relative deviation degree of the actual image of the imaging lens and the ideal image. According to Figure 9A , Figure 9B and Figure 9C , it can be known that the imaging lenses in the embodiment four, the embodiment five and the embodiment six can all achieve good imaging quality.

[0153] Embodiment Seven

[0154] As shown in Figure 10As shown, in this embodiment, the imaging lens comprises a lens barrel P0 and a plurality of lens groups and a plurality of spacer elements assembled in the lens barrel P0, the lens groups comprise, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprise: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting the image side of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting the image side of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting the image side of the third lens E3.

[0155] In this embodiment, the first lens E1 has positive refractive power, the object side of the first lens E1 is convex, and the image side of the first lens E1 is concave; the second lens E2 has positive refractive power, the object side of the second lens E2 is convex, and the image side of the second lens E2 is planar and is a super surface; the third lens E3 has negative refractive power, the object side of the third lens E3 is concave, and the image side of the third lens E3 is convex; and the fourth lens E4 has negative refractive power, the object side of the fourth lens E4 is convex, and the image side of the fourth lens E4 is concave.

[0156] In addition, Table 7 shows the basic optical parameters of the imaging lens of Embodiment Seven, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0157] Table 7: Optical parameter table of the imaging lens of Embodiment Seven

[0158]

[0159] In this embodiment, the object side and the image side of any one of the first lens E1, the third lens E3 and the fourth lens E4 are aspherical surfaces, and the object side of the second lens E2 is an aspherical surface, the surface type x of each aspherical lens can be defined by, but not limited to, the aspherical formula in Embodiment One.

[0160] The following Tables 8-1 and 8-2 give the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 that can be used for the aspherical surfaces S1 to S3, S5 to S8 in Embodiment Seven.

[0161] Table 8-1: Aspherical coefficient table of the imaging lens in Embodiment Seven

[0162]

[0163] Table 8-2: Aspherical coefficient table of the imaging lens in Embodiment Seven

[0164]

[0165] In this embodiment, the image side surface of the second lens E2 is a metasurface, which can be defined by the metasurface phase equation in Embodiment One, but is not limited thereto.

[0166] Table 9 below gives the coefficient values of the metasurface phase equation applicable to S4 in this embodiment.

[0167] Table 9: Metasurface phase equation coefficient table of the imaging lens in Embodiment Seven

[0168]

[0169] Embodiment Eight

[0170] As Figure 11 shown in this embodiment, the imaging lens comprises a lens barrel P0 and a lens group and a plurality of spacer elements assembled in the lens barrel P0, the lens group comprises, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprises: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side surface of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting against the image side surface of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side surface of the third lens E3.

[0171] It is worth noting that, compared with the above-mentioned Embodiment Seven, the imaging lens of this embodiment has the same optical parameters, i.e., the basic optical parameter table of the imaging lens of this embodiment is the same as Table 7, the aspherical coefficient table is the same as Table 8-1 and Table 8-2, and the phase equation coefficient is the same as Table 9. While the imaging lens of this embodiment and the imaging lens of the above-mentioned Embodiment Seven have different structural parameters, i.e., the difference between this embodiment and the above-mentioned Embodiment Seven lies in that the size values of some structural parameters of the lens barrel P0 and the spacer elements in the imaging lens are different.

[0172] Specifically, the values of each relevant structural parameter in this embodiment and the above-mentioned Embodiment Seven are shown in Table 11 below, respectively. It can be understood that the units of the values of each parameter shown in Table 11 are millimeters (mm), and the schematic representation of each parameter in the structural diagram of the imaging lens is shown in Figure 1 .

[0173] Embodiment Nine

[0174] As Figure 12As shown in the embodiment, the imaging lens comprises a lens barrel P0 and a plurality of lens groups and a plurality of spacer elements assembled in the lens barrel P0, the lens groups comprise, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3 and a fourth lens E4; the plurality of spacer elements comprise: a first spacer element P1 disposed between the first lens E1 and the second lens E2 and abutting against the image side of the first lens E1, a second spacer element P2 disposed between the second lens E2 and the third lens E3 and abutting against the image side of the second lens E2, and a third spacer element P3 disposed between the third lens E3 and the fourth lens E4 and abutting against the image side of the third lens E3.

[0175] It is worth noting that, compared with the above-mentioned embodiment seven, the imaging lens of the embodiment nine has the same optical parameters, i.e., the basic optical parameter table of the imaging lens of the embodiment nine is the same as Table 7, the aspherical surface coefficient table is the same as Table 8-1 and Table 8-2, and the phase equation coefficient is the same as Table 9. While the imaging lens of the embodiment nine and the imaging lens of the above-mentioned embodiment seven have different structural parameters, i.e., the embodiment nine and the above-mentioned embodiment seven are different in that the size values of some structural parameters of the lens barrel P0 and the spacer elements in the imaging lens are different.

[0176] Specifically, the values of each relevant structural parameter in the embodiment nine and the above-mentioned embodiment seven are shown in Table 11 below, respectively. It can be understood that the units of the values of each parameter shown in Table 11 are millimeters (mm), and the schematic representation of each parameter in the structural diagram of the imaging lens is shown in Figure 1 .

[0177] The on-axis chromatic aberration curves of the imaging lenses in the embodiment seven, the embodiment eight and the embodiment nine are shown in Figure 13A , which represent the degree of deflection of the converging focus points of light rays of different wavelengths after passing through the imaging lens; the astigmatism curves of the imaging lenses in the embodiment seven, the embodiment eight and the embodiment nine are shown in Figure 13B , which represent the meridional image surface curvature and sagittal image surface curvature; the distortion curves of the imaging lenses in the embodiment seven, the embodiment eight and the embodiment nine are shown in Figure 13C , which represent the relative deviation degree of the actual image of the imaging lens and the ideal image. According to Figure 13A , Figure 13B and Figure 13C , it can be known that the imaging lenses in the embodiment seven, the embodiment eight and the embodiment nine can all achieve good imaging quality.

[0178] In summary, in Embodiment 1 to Embodiment 9, the effective focal length f of the imaging lens, the effective focal lengths f1 to f4 of the first lens E1 to the fourth lens E4 in the imaging lens, the effective focal length f of the imaging lens, and the sum ∑CT of the central thicknesses of the first lens E1, the second lens E2, the third lens E3, and the fourth lens E4 on the optical axis in the imaging lens are respectively as shown in Table 10 below.

[0179] Table 10: System optical parameter table of the imaging lens

[0180]

[0181] In addition, the structural parameters of the imaging lens in Embodiment 1 to Embodiment 9 are specifically as shown in Table 11.

[0182] Table 11: Structural parameter data table of the imaging lens

[0183]

[0184] In Table 11 above, each structural parameter is explained as follows: d1s is the inner diameter of the object side of the first spacer element P1, d1m is the inner diameter of the image side of the first spacer element P1, D1s is the outer diameter of the object side of the first spacer element P1, D1m is the outer diameter of the image side of the first spacer element P1, d2s is the inner diameter of the object side of the second spacer element P2, d2m is the inner diameter of the image side of the second spacer element P2, D2s is the outer diameter of the object side of the second spacer element P2, D2m is the outer diameter of the image side of the second spacer element P2, d3s is the inner diameter of the object side of the third spacer element P3, d3m is the inner diameter of the image side of the third spacer element P3, D3s is the outer diameter of the object side of the third spacer element P3, D3m is the outer diameter of the image side of the third spacer element P3, d0s is the inner diameter of the object side of the lens barrel P0, d0m is the inner diameter of the image side of the lens barrel P0, D0s is the outer diameter of the object side of the lens barrel P0, D0m is the outer diameter of the image side of the lens barrel P0, EP01 is the distance along the optical axis direction from the object side of the lens barrel P0 to the object side of the first spacer element P1, EP12 is the distance along the optical axis direction from the image side of the first spacer element P1 to the object side of the second spacer element P2, CP2 is the maximum thickness of the second spacer element P2 along the optical axis direction, EP23 is the distance along the optical axis direction from the image side of the second spacer element P2 to the object side of the third spacer element P3, CP3 is the thickness of the third spacer element P3 along the optical axis direction, and L is the maximum height from the object side of the lens barrel P0 to the image side of the lens barrel P0.

[0185] In summary, the imaging lens in Embodiment 1 to Embodiment 9 satisfies the relational expressions shown in Table 12, which are specifically as shown in Table 12.

[0186] Table 12: Relational expression table satisfied by the imaging lens

[0187]

[0188] It is worth mentioning that, according to an aspect of the present application, one embodiment of the present application further provides a camera module which can include the imaging lens and a photosensitive element arranged on the image side of the imaging lens for imaging. It can be understood that the photosensitive element mentioned in the present application can be implemented as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) but is not limited thereto, and the present application will not be repeated here.

[0189] In addition, according to another aspect of the present application, one embodiment of the present application further provides an electronic device which can include the camera module and a processor, the camera module being communicatively connected to the processor for acquiring image data and inputting the image data to the processor for processing. It can be understood that the electronic device mentioned in the present application can be implemented as a device such as a mobile phone equipped with the camera module but is not limited thereto, and the present application will not be repeated here.

[0190] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0191] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent protection of the present application should be subject to the appended claims.

Claims

1. An imaging lens comprising a lens barrel, and a plurality of lens elements and a plurality of spacer elements assembled in the lens barrel, characterized in that: the plurality of lens elements comprises, in order from an object side to an image side, a first lens element having positive refractive power, a second lens element having positive refractive power, a third lens element having negative refractive power, and a fourth lens element having negative refractive power; the plurality of spacer elements comprises a first spacer element, a second spacer element, and a third spacer element, wherein the first spacer element is located between the first lens element and the second lens element and abuts an image side of the first lens element, the second spacer element is located between the second lens element and the third lens element and abuts an image side of the second lens element, and the third spacer element is located between the third lens element and the fourth lens element and abuts an image side of the third lens element; the second lens element is a meta-lens, and an image side of the second lens element is a meta-surface; and the imaging lens satisfies 2.35 < f2 / (D2s-d2s) < 4.95, 0.85 < CT2 / (EP12+CP2) < 1.25, wherein f2 is an effective focal length of the second lens element, D2s is an outer diameter of an object side of the second spacer element, d2s is an inner diameter of the object side of the second spacer element, CT2 is a central thickness of the second lens element on an optical axis, EP12 is a distance along the optical axis from an image side of the first spacer element to an object side of the second spacer element, and CP2 is a maximum thickness of the second spacer element along the optical axis. The meta-surface comprises a substrate and a microstructure formed on the substrate, a surface of the substrate is a plane, and the substrate is a glass piece. The imaging lens satisfies 1.35 < L / MD < 1.60, wherein L is a maximum height from an object side of the lens barrel to an image side of the lens barrel, and MD is an on-axis distance from the image side of the second lens element to the image side of the fourth lens element. The imaging lens satisfies 1.50 < (D0m-d0s) / f < 2.05, wherein D0m is an outer diameter of the image side of the lens barrel, d0s is an inner diameter of the object side of the lens barrel, and f is a system focal length of the imaging lens. The imaging lens satisfies 1.20 < (EP23+CP3) / T23 < 1.65, wherein EP23 is a distance along the optical axis from an image side of the second spacer element to an object side of the third spacer element, CP3 is a maximum thickness of the third spacer element along the optical axis, and T23 is an air gap of the second lens element and the third lens element on the optical axis.

2. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies 5.50 ≤ d1s / T12 ≤ 7.81, wherein d1s is an inner diameter of an object side of the first spacer element, and T12 is an air gap of the first lens element and the second lens element on the optical axis.

3. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies 1.55 < R1 / EP01 < 2.0, wherein R1 is a radius of curvature of an object side of the first lens element, and EP01 is a distance along the optical axis from the object side of the lens barrel to the object side of the first spacer element.

4. The imaging lens according to claim 1, characterized in that, ​ 5. The imaging lens according to claim 1, characterized in that, ​ 6. The imaging lens according to claim 1, characterized in that, ​ 7. The imaging lens according to claim 1, characterized in that, ​ 8. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: 3.1 < R3 / d1m < 3.75; wherein R3 is the curvature radius of the object side surface of the second lens, and d1m is the inner diameter of the image side surface of the first spacer element.

9. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: -3.55 < f4 / d0m < -2.05; wherein f4 is the effective focal length of the fourth lens, and d0m is the inner diameter of the image side surface of the lens barrel.

10. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: 1.1 < (D1s+D1m) / f1 < 1.4; wherein D1s is the outer diameter of the object side surface of the first spacer element, D1m is the outer diameter of the image side surface of the first spacer element, and f1 is the effective focal length of the first lens.

11. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: 4.21 ≤ d3m / (CT3+T34) ≤ 5.20; wherein d3m is the inner diameter of the image side surface of the third spacer element, CT3 is the central thickness of the third lens on the optical axis, and T34 is the air interval of the third lens and the fourth lens on the optical axis.

12. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: 1.65 < (D1m+D3m) / D2m < 2.2; wherein D1m is the outer diameter of the image side surface of the first spacer element, D2m is the outer diameter of the image side surface of the second spacer element, and D3m is the outer diameter of the image side surface of the third spacer element.

13. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: -7.15 < f3 / (d3s+D3s) < -3.6; wherein f3 is the effective focal length of the third lens, d3s is the inner diameter of the object side surface of the third spacer element, and D3s is the outer diameter of the object side surface of the third spacer element.

14. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: 2.05 < D0s / ∑CT < 2.65; wherein D0s is the outer diameter of the object side surface of the lens barrel, and ∑CT is the sum of the central thicknesses of the first lens, the second lens, the third lens and the fourth lens on the optical axis.

15. The imaging lens according to claim 1, characterized in that, The imaging lens satisfies: 4.00 mm ≤ d2m×(V2 / V3) ≤ 4.98 mm; wherein d2m is the inner diameter of the image side surface of the second spacer element, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.

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