Imaging Lenses

Abstract

The present invention provides an imaging lens. The imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the spacer element group includes a first spacer element and a second spacer element; it satisfies: 0.8 < f1 / f < 1.3; it satisfies: ; it satisfies: 1.05 < D1m / d1s < 1.4. The present invention solves the problem that the imaging lens in the prior art has a high sensitivity of the front-end lens due to meeting the focusing requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an imaging lens. Background Art

[0002] With the continuous development of smart phones, the pixels and image quality of the imaging lenses mounted thereon have been significantly improved, and the performance of the imaging lenses of some flagship models has approached the level of professional cameras. In order to meet the shooting requirements of focusing, magnifying local details, and high imaging clarity, the imaging lens is usually equipped with a telephoto characteristic. However, at present, the front lens of the imaging lens that meets the telephoto characteristic has a high sensitivity, which affects the imaging quality of the imaging lens.

[0003] That is to say, the imaging lens in the prior art has the problem that the front lens has a high sensitivity due to meeting the focusing requirement. Summary of the Invention

[0004] The main object of the present invention is to provide an imaging lens to solve the problem that the front lens of the imaging lens in the prior art has a high sensitivity due to meeting the focusing requirement.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided an imaging lens, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses, and the five lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially contacting the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and at least partially contacting the image side surface of the second lens; the effective focal length f1 of the first lens and the effective focal length f of the imaging lens satisfy: 0.8 < f1 / f < 1.3; the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy: ; the outer diameter D1m of the image side of the first spacer element and the inner diameter d1s of the object side of the first spacer element satisfy: 1.05 < D1m / d1s < 1.4.

[0006] According to another aspect of the present invention, there is provided an imaging lens, comprising a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of five lenses. The five lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power. The spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens. The following relationships are satisfied between the effective focal length f1 of the first lens and the effective focal length f of the imaging lens: 0.8 < f1 / f < 1.3; between the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens: -1.2 < R3 / R4 < -0.5; between the inner diameter d2m of the image side of the second spacer element and the outer diameter D2m of the image side of the second spacer element: 0.5 < d2m / D2m < 0.9.

[0007] According to another aspect of the present invention, there is provided an imaging lens, comprising a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of five lenses. The five lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power. The spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The following relationship is satisfied between the entrance pupil diameter EPD of the imaging lens and the inner diameter d1s of the object side of the first spacer element: 0.87 < EPD / d1s < 1.1; between the radius of curvature R9 of the object side surface of the fifth lens, the outer diameter D4s of the object side of the fourth spacer element, and the inner diameter d4s of the object side of the fourth spacer element: -10.8 < R9 / (D4s - d4s) < 2.1.

[0008] Further, the spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The following relationship is satisfied between the axial spacing distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element, the axial spacing distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element, and the refractive index N3 of the third lens: .

[0009] Furthermore, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The following condition is satisfied between the central thickness CT5 of the fifth lens and the image-side outer diameter D4m of the fourth spacer element: 0 < CT5 / D4m < 0.2.

[0010] Furthermore, the following condition is satisfied between the object-side outer diameter D1s of the first spacer element and the central thickness CT1 of the first lens: 0.1 < CT1 / D1s < 0.3.

[0011] Furthermore, the spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The following condition is satisfied between the entrance pupil diameter EPD of the imaging lens and the image-side inner diameter d3m of the third spacer element: 0.8 < EPD / d3m < 1.4.

[0012] Furthermore, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The following conditions are satisfied among the effective focal length f4 of the fourth lens, the object-side outer diameter D4s of the fourth spacer element, and the object-side inner diameter d4s of the fourth spacer element: 。

[0013] Furthermore, the following condition is satisfied between the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens: -1.2 < R3 / R4 < -0.5; the following condition is satisfied between the image-side inner diameter d2m and the image-side outer diameter D2m of the second spacer element: 0.5 < d2m / D2m < 0.9.

[0014] Furthermore, the following condition is satisfied between the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens: -0.8 < f4 / f5 < -0.4; the following condition is satisfied between the object-side outer diameter D0s of the lens barrel and the maximum axial height L of the lens barrel: 0.8 < D0s / L < 1.1.

[0015] Furthermore, the spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The following condition is satisfied among the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the maximum thickness CP3 of the third spacer element: 0.4 ≤ (CT3 + CT4) / (T34 + CP3) < 2.1.

[0016] Furthermore, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The following condition is satisfied between the curvature radius R7 of the object side surface of the fourth lens and the object-side inner diameter d4s of the fourth spacer element: -15 < R7 / d4s < 6.1.

[0017] Further, the first lens has a positive optical power, and its object side is convex; the second lens has a positive optical power, its object side is convex, and its image side is convex; the third lens has a negative optical power, and its image side is concave; the fourth lens has a positive optical power, and its image side is convex; the fifth lens has a negative optical power, and its image side is concave.

[0018] Applying the technical solution of the present invention, the imaging lens of the present application is composed of a lens barrel and five lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably arranging the positions of the five lenses and the first and second spacer elements and setting the imaging lens to satisfy 0.8 < f1 / f < 1.3 and When it is, it is beneficial to improve the light-gathering ability of the optical system while adjusting the field curvature, improve the imaging clarity, and can also improve the matching degree between the peripheral field CRA of the imaging lens and the chip CRA, reducing the risk of color cast. However, in this case, the sensitivities of the first lens and the second lens are relatively high, affecting the imaging quality. Therefore, in the present application, by restricting 1.05 < D1m / d1s < 1.4, the ratio range of the image-side outer diameter of the first spacer element to the object-side inner diameter of the first spacer element is reasonably restricted, which is beneficial to reducing the surface sensitivity of the lenses adjacent to the first spacer element, and can effectively eliminate the chromatic aberration problem caused by the air gap between the first lens and the second lens, thereby weakening the influence of the front-end lens sensitivity on the imaging quality and ensuring the imaging quality of the imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 Shows the dimension marking diagram of the imaging lens of an optional embodiment of the present invention;

[0021] Figure 2 Shows the schematic structural diagram of the imaging lens of Embodiment 1-1 of the present invention;

[0022] Figure 3 Shows the schematic structural diagram of the imaging lens of Embodiment 1-2 of the present invention;

[0023] Figure 4 Shows the schematic structural diagram of the imaging lens of Embodiment 1-3 of the present invention;

[0024] Figures 5 to 7 Respectively show the axial chromatic aberration curve, astigmatism curve and distortion curve of the imaging lens of Embodiment 1 of the present invention;

[0025] Figure 8 Shows the schematic structural diagram of the imaging lens of Embodiment 2-1 of the present invention;

[0026] Fig. 9 A schematic structural diagram of an imaging lens according to Embodiment 2-2 of the present invention is shown;

[0027] Fig.10 A schematic structural diagram of an imaging lens according to Embodiment 2-3 of the present invention is shown;

[0028] Figures 11 to 13 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens of the second embodiment of the present invention are respectively shown;

[0029] Fig.14 A schematic structural diagram of an imaging lens according to Embodiment 3-1 of the present invention is shown;

[0030] Fig.15 A schematic structural diagram of an imaging lens according to Embodiment 3-2 of the present invention is shown;

[0031] Fig.16 A schematic structural diagram of an imaging lens according to Embodiment 3-3 of the present invention is shown;

[0032] Figures 17 to 19 The axial chromatic aberration curve, astigmatism curve and distortion curve of the imaging lens of the third embodiment of the present invention are respectively shown;

[0033] Fig. 20 It shows that the imaging lens of an optional embodiment of the present invention satisfies f1 / f=0.86, MTF defocus curve when =0.49 and D1m / d1s=1.24;

[0034] Fig.21 It shows that the imaging lens of an optional embodiment of the present invention satisfies f1 / f=0.86, MTF defocus curve when =0.49 and D1m / d1s=1.02;

[0035] Fig. 22 It shows that the imaging lens of an optional embodiment of the present invention satisfies f1 / f=0.86, MTF defocus curve when =0.49 and D1m / d1s=1.7.

[0036] The above drawings include the following reference numerals:

[0037] P0, lens barrel; 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; P1, first spacing element; P2, second spacing element; P3, third spacing element; P4, fourth spacing element. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0040] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0041] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0042] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0043] In this text, the paraxial region refers to the 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 paraxial 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 paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in this field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side surface as an example, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; taking the image side surface as an example, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In this application, the left side is the object side and the right side is the image side.

[0044] In order to solve the problem that the existing imaging lens has a high sensitivity of the front lens due to meeting the focusing requirements, the present invention provides an imaging lens.

[0045] As Figures 1 to 22 shown, in an optional embodiment of the present application, the imaging lens includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens; the spacer element group includes a first spacer element placed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, and a second spacer element placed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; the effective focal length f1 of the first lens and the effective focal length f of the imaging lens satisfy: 0.8 < f1 / f < 1.3; the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens satisfy: ; the outer diameter D1m of the image side of the first spacer element and the inner diameter d1s of the object side of the first spacer element satisfy: 1.05 < D1m / d1s < 1.4.

[0046] The imaging lens of the present application is composed of a lens barrel and five lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the positions of the five lenses, the first and second spacer elements and setting the imaging lens to satisfy 0.8 < f1 / f < 1.3 and When this occurs, it is beneficial to improve the light-gathering ability of the optical system while adjusting the field curvature, enhance the imaging clarity, and also improve the matching degree between the edge field CRA of the imaging lens and the chip CRA, reducing the risk of color cast. However, in this case, the sensitivities of the first lens and the second lens are relatively high, affecting the imaging quality. Therefore, in this application, by restricting 1.05 < D1m / d1s < 1.4, the ratio range of the image-side outer diameter to the object-side inner diameter of the first spacer element is reasonably restricted, which is beneficial to reducing the surface sensitivity of the lenses adjacent to the first spacer element and can effectively eliminate the chromatic aberration problem caused by the air gap between the first lens and the second lens, thereby weakening the influence of the front-end lens sensitivity on the imaging quality and ensuring the imaging quality of the imaging lens.

[0047] In this application, there is an air gap between any two adjacent lenses among the first lens to the fifth lens. The spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image-side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image-side surface of the fourth lens.

[0048] In addition, referring to Table 1 below and Figure 20 to Figure 22 as shown, on the premise that the imaging lens satisfies f1 / f = 0.86 and = 0.49, Fig. 20 shows the MTF defocus curve graph when the imaging lens satisfies D1m / d1s = 1.24, Fig.21 shows the MTF defocus curve graph when the imaging lens satisfies D1m / d1s = 1.02, Fig. 22 shows the MTF defocus curve graph when the imaging lens satisfies D1m / d1s = 1.7.

[0049] From Figure 20 to Figure 22 it can be seen that when D1m / d1s = 1.24, the energy of the MTF defocus curve is relatively concentrated and the performance is better. When D1m / d1s = 1.02, the surface of the first lens is more sensitive, and the extra light is not intercepted, resulting in a drop in both the central and outer field performances and a poor performance. When D1m / d1s = 1.7, the light entering the second lens is overly blocked, causing a drop in the outer field performance and a poor performance. Thus, it can be seen that when D1m / d1s is within the range of 1.05 to 1.4, the surface sensitivities of the first lens and the second lens of the imaging lens are reduced, and the chromatic aberration problem caused by the air gap between the first lens and the second lens is effectively eliminated, thereby reducing the influence of the front-end lens sensitivity on the imaging quality and improving the imaging quality of the imaging lens.

[0050] Table 1

[0051]

[0052] In this embodiment, the distance EP23 along the optical axis direction from the image side surface of the second spacer element to the object side surface of the third spacer element, the distance EP34 along the optical axis direction from the image side surface of the third spacer element to the object side surface of the fourth spacer element, and the refractive index N3 of the third lens satisfy: By restricting this conditional expression, the edge thickness of the third lens can be controlled within a suitable range to ensure the molding stability of the lens. At the same time, the edge thickness of the fourth lens can be indirectly controlled to ensure that light can pass through the fourth lens smoothly, ensuring the processability and thickness ratio of the third lens and the fourth lens, which is beneficial to the surface shape stability of the third lens and the fourth lens after molding, and ultimately contributes to the improvement of the quality of the imaging lens.

[0053] In this embodiment, the center thickness CT5 of the fifth lens and the image side outer diameter D4m of the fourth spacer element satisfy: 0 < CT5 / D4m < 0.2. By restricting this ratio range, the height of the light passing through the fifth lens is restricted, avoiding the problem of internal reflection stray light in the lens caused by excessive off-axis field light.

[0054] In this embodiment, the object side outer diameter D1s of the first spacer element and the center thickness CT1 of the first lens satisfy: 0.1 < CT1 / D1s < 0.3. By this conditional expression, the center thickness of the first lens is restricted, making it more conducive to molding, reducing eccentricity and making its surface shape more stable, and being more conducive to assembly.

[0055] In this embodiment, the entrance pupil diameter EPD of the imaging lens and the image side inner diameter d3m of the third spacer element satisfy: 0.8 < EPD / d3m < 1.4. By this conditional expression, the light input amount of the system can be made larger without causing the problem of stronger stray light, enabling the imaging lens of the present application to meet the characteristics of long focal length and obtaining good shooting clarity even at night.

[0056] In this embodiment, the effective focal length f4 of the fourth lens, the object side outer diameter D4s of the fourth spacer element, and the object side inner diameter d4s of the fourth spacer element satisfy: By designing the focal length of the fourth lens and the inner and outer diameters of its adjacent spacer elements, the outer diameter size of the fourth lens is restricted, ensuring its bearing thickness with the lens barrel and reducing the molding processing difficulty of a single component.

[0057] In this embodiment, the following conditions are satisfied between the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens: -1.2 < R3 / R4 < -0.5; the following condition is satisfied between the inner diameter d2m of the image side of the second spacer element and the outer diameter D2m of the image side of the second spacer element: 0.5 < d2m / D2m < 0.9. By reasonably restricting the ratio range of the radii of curvature of the two side surfaces of the second lens, it is beneficial to ensure that light can pass through the lens smoothly and meet the performance requirements. By controlling the inner and outer diameters of the image side of the second spacer element, the stray light rays generated by the second lens and the third lens can be effectively blocked, avoiding the generation of stray light and preventing stray light from entering the rear to affect the imaging quality, thus ensuring the imaging quality.

[0058] In this embodiment, the following condition is satisfied between the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens: -0.8 < f4 / f5 < -0.4; the following condition is satisfied between the outer diameter D0s of the object side of the lens barrel and the maximum axial height L of the lens barrel: 0.8 < D0s / L < 1.1. By restricting the ratio of the effective focal lengths of the fourth lens and the fifth lens with this conditional formula, it is beneficial to control the surface shapes of the two lenses, enable light to be transmitted along the required path, avoid performance differences caused by different molding batches, and at the same time, by controlling the ratio of the outer diameter of the object side of the lens barrel to the maximum axial height of the lens barrel, the total weight of the imaging lens is reduced, which is more conducive to the load capacity of the motor.

[0059] In this embodiment, the following condition is satisfied between the central thickness CT3 of the third lens, the central thickness CT4 of the fourth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the maximum thickness CP3 of the third spacer element: 0.4 ≤ (CT3 + CT4) / (T34 + CP3) < 2.1. When the maximum thickness of the third spacer element and the air gap at its position are controlled within the above range, it can be ensured that the third spacer element will not show obvious deformation after assembly, and will not show obvious deformation during the manufacturing process of high-temperature baking, improving the light-blocking efficiency of the third spacer element and reducing the risk of stray light.

[0060] In this embodiment, the following condition is satisfied between the radius of curvature R7 of the object side surface of the fourth lens and the inner diameter d4s of the object side of the fourth spacer element: -15 < R7 / d4s < 6.1. This conditional formula avoids the situation where the tolerance sensitivity of a single component at the position of this lens and its vicinity is too large due to the excessive curvature of the fourth lens by controlling the radius of curvature of the fourth lens. Controlling the inner diameter of the object side of the fourth spacer element within a certain range can not only intercept the off-axis light rays and improve the off-axis field performance, but also ensure that the relative illumination is not too low, so that the picture brightness is relatively uniform.

[0061] In this embodiment, the first lens has a positive focal power, and its object side is convex; the second lens has a positive focal power, its object side is convex, and its image side is convex; the third lens has a negative focal power, and its image side is concave; the fourth lens has a positive focal power, and its image side is convex; the fifth lens has a negative focal power, and its image side is concave. By reasonably planning the focal powers and surface profiles of the lenses, it is beneficial to ensure that light can be transmitted along the designed path, facilitating the smooth transition of light, reducing distortion, optimizing field curvature, reducing aberration, and ensuring imaging quality.

[0062] Optionally, the imaging lens in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. During the simulation using the above-mentioned software and / or tools, the surface profiles of the lenses can be appropriately adjusted according to the built-in surface profiles of the software and / or tools used.

[0063] In addition, in another alternative embodiment of the present application, as Figures 1 to 22 shown, an imaging lens is further provided. The imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens with a positive focal power, a second lens with a positive focal power, a third lens with a negative focal power, a fourth lens with a positive focal power, and a fifth lens with a negative focal power; the spacer element group includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side of the first lens, and a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side of the second lens; the effective focal length f1 of the first lens and the effective focal length f of the imaging lens satisfy: 0.8 < f1 / f < 1.3; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: -1.2 < R3 / R4 < -0.5; the inner diameter d2m of the image side of the second spacer element and the outer diameter D2m of the image side of the second spacer element satisfy: 0.5 < d2m / D2m < 0.9.

[0064] The imaging lens of the present application is composed of a lens barrel and five lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the optical powers of the five lenses, the positions of the first and second spacer elements, and setting the imaging lens to satisfy 0.8 < f1 / f < 1.3, -1.2 < R3 / R4 < -0.5, and 0.5 < d2m / D2m < 0.9, it is beneficial to improve the light-gathering ability of the optical system while adjusting the field curvature, improve the imaging clarity, and also improve the matching degree between the peripheral field CRA of the imaging lens and the chip CRA, reducing the risk of color cast. By reasonably restricting the ratio range of the curvature radii of the two surfaces on both sides of the second lens, it is beneficial to ensure that light can pass through the lens smoothly and meet the performance requirements. By controlling the inner and outer diameters of the image side of the second spacer element, it can effectively block the stray light rays generated by the second lens and the third lens, avoid the generation of stray light, and prevent stray light from entering the rear to affect the imaging quality, ensuring the imaging quality.

[0065] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0066] In addition, in another alternative embodiment of the present application, as Figures 1 to 22 shown, an imaging lens is further provided, which includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power. The spacer element group includes a first spacer element placed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, and a fourth spacer element placed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The entrance pupil diameter EPD of the imaging lens and the inner diameter d1s of the object side of the first spacer element satisfy: 0.87 < EPD / d1s < 1.1. The curvature radius R9 of the object side surface of the fifth lens, the outer diameter D4s of the object side of the fourth spacer element, and the inner diameter d4s of the object side of the fourth spacer element satisfy: -10.8 < R9 / (D4s - d4s) < 2.1.

[0067] The imaging lens of the present application is composed of a lens barrel and five lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the optical powers of the five lenses, the positions of the first and fourth spacer elements, and setting the imaging lens to satisfy 0.87 < EPD / d1s < 1.1, -10.8 < R9 / (D4s - d4s) < 2.1, it is beneficial to control the first spacer element to intercept stray light while ensuring the light input of the system, avoid stray light from entering the rear to affect the imaging quality, and ensure the imaging quality. At the same time, it can ensure the rationality of the structural dimensions of the fourth lens and ensure the bearing stability.

[0068] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0069] Optionally, the imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0070] The imaging lens in the present application may use multiple lenses, such as the five lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0071] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiments, the imaging lens is not limited to including five lenses. If necessary, the imaging lens may also include other numbers of lenses.

[0072] Figure 1 A schematic diagram of the dimensions of an imaging lens of the present application is shown. Figure 1 Parameters such as D0s, D1m, D1s, d1s, D2m, d2m, D4s, d4s, D4m, d3m, CP3, EP23, EP34, and L are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0073] The following further describes examples of specific surface shapes and parameters of the imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0074] It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3; in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3; and in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3. In the three examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distances between lenses of the imaging lens are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first to fourth spacing elements, and the shapes of some lenses are different. In other words, the main structures used for imaging are the same, but the auxiliary structures used for imaging are different.

[0075] It should be noted that any one of the following embodiments 1 to 3 is applicable to all embodiments of the present application.

[0076] Embodiment 1

[0077] like Figures 2 to 7 As shown, the imaging lens of the first embodiment is described. Figure 2 FIG. 1 is a schematic diagram showing the structure of an imaging lens of Embodiment 1-1. Figure 3 FIG. 1 is a schematic diagram showing the structure of the imaging lens of Embodiment 1-2. Figure 4 The schematic diagram of the structure of the imaging lens of Embodiment 1-3 is shown.

[0078] like Figures 2 to 4 As shown, the imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis.

[0079] like Figure 2 , which is a schematic diagram of the structure of the imaging lens of Example 1-1. In this example, the object side surface and the image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer element, and the image side surface of the third auxiliary spacer element is respectively in contact with the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface of the fourth auxiliary spacer element, and the image side surface of the fourth auxiliary spacer element is respectively in contact with the object side surface S9 of the fifth lens.

[0080] like Figure 3The figure is a schematic diagram of the structure of the imaging lens of Example 1-2. The difference between this example and Example 1-1 is that a first auxiliary spacer element is further provided on the image side surface of the first spacer element P1, the object side surface and the image side surface of the first spacer element P1 are respectively abutted against the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer element, and the image side surface of the first auxiliary spacer element is partially abutted against the object side surface S3 of the second lens. The abutting manner of the remaining spacer elements is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and no further description is given here.

[0081] like Figure 4 , which is a schematic diagram of the structure of the imaging lens of Example 1-3. The difference between this example and Example 1-2 is that there are two third auxiliary spacer elements, and the two third auxiliary spacer elements are located between the third spacer element P3 and the fourth lens E4. There are two fourth auxiliary spacer elements, and the two fourth auxiliary spacer elements are located between the fourth spacer element P4 and the fifth lens E5. The supporting and abutting manner of the remaining spacer elements is the same as that of Example 1-2, and the relevant description in Example 1-2 can be referred to, and no further description is given here.

[0082] In summary, the structural parameters of the imaging lens of Example 1 under Example 1-1, Example 1-2, and Example 1-3 are shown in Table 2. (Unit: mm)

[0083] Table 2

[0084]

[0085] In the first embodiment, 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 convex 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 convex surface. The object side surface S5 of the third lens is a concave 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 convex 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 concave surface.

[0086] In Example 1, the aperture value Fno of the imaging lens is 2.00, the effective focal length f of the imaging lens is 14.95 mm, the effective focal length f1 of the first lens is 12.39 mm, the effective focal length f2 of the second lens is 9.09 mm, the effective focal length f3 of the third lens is -4.74 mm, the effective focal length f4 of the fourth lens is 9.17 mm, and the effective focal length f5 of the fifth lens is -12.07 mm.

[0087] Table 3 shows the basic structural parameters of the imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0088] Table 3

[0089]

[0090] In the first embodiment, the object side surface and the image side surface of the first lens E1 to the fifth lens E5 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0091] Formula (1)

[0092] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in the above Table 1; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface s1-s10 in Example 1.

[0093] Table 4

[0094]

[0095] Figure 5 The axial chromatic aberration curve of the imaging lens of the first embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens. Figure 6 The astigmatism curve of the imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0096] according to Figures 5 to 7 It can be seen that the imaging lens provided in the first embodiment can achieve good imaging quality.

[0097] Embodiment 2

[0098] like Figures 8 to 13 As shown, the imaging lens of the second embodiment is described. Figure 8 FIG. 2 shows a schematic structural diagram of an imaging lens of Embodiment 2-1. Fig. 9 FIG. 2 shows a schematic structural diagram of an imaging lens of Embodiment 2-2. Fig.10 A schematic structural diagram of the imaging lens of Embodiment 2-3 is shown.

[0099] like Figures 8 to 10As shown, the imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis.

[0100] like Figure 8 , which is a schematic diagram of the structure of the imaging lens of Example 2-1. In this example, the object side surface and image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer element, and the image side surface of the first auxiliary spacer element is respectively in contact with the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0101] like Fig. 9 , which is a schematic diagram of the structure of the imaging lens of Example 2-2. The difference between this example and Example 2-1 is that two first auxiliary spacer elements are arranged between the image side surface of the first spacer element P1 and the second lens E2. The supporting and abutting manner of the remaining spacer elements is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0102] like Fig.10 , which is a schematic diagram of the structure of the imaging lens of Example 2-3. The difference between this example and Example 2-1 is that a third auxiliary spacer element is provided on the image side of the third spacer element P3, and the object side surface and image side surface of the third auxiliary spacer element are respectively abutted against the image side surface of the third spacer element P3 and the object side surface S7 of the fourth lens. The abutment manner of the remaining spacer elements is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0103] In summary, the structural parameters of the imaging lens of the second embodiment in Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3 are shown in Table 5. (Unit: mm)

[0104] Table 5

[0105]

[0106] In the second embodiment, 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 convex surface. The object side surface S5 of the third lens is a concave 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.

[0107] In Example 2, the aperture value Fno of the imaging lens is 1.85, the effective focal length f of the imaging lens is 15.05 mm, the effective focal length f1 of the first lens is 12.89 mm, the effective focal length f2 of the second lens is 15.96 mm, the effective focal length f3 of the third lens is -6.72 mm, the effective focal length f4 of the fourth lens is 18.57 mm, and the effective focal length f5 of the fifth lens is -40.14 mm.

[0108] Table 6 shows a basic structural parameter table of the imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0109] Table 6

[0110]

[0111] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface s1-s10 in Example 2.

[0112] Table 7

[0113]

[0114] Fig.11 The axial chromatic aberration curve of the imaging lens of the second embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens. Fig.12 The astigmatism curve of the imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.13 The distortion curve of the imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0115] according to Figures 11 to 13 It can be seen that the imaging lens provided in the second embodiment can achieve good imaging quality.

[0116] Embodiment 3

[0117] like Figures 14 to 19 As shown, the imaging lens of the third embodiment is described. Fig.14FIG. 3 is a schematic diagram showing the structure of an imaging lens of Example 3-1. Fig.15 FIG. 3 is a schematic diagram showing the structure of an imaging lens of Embodiment 3-2. Fig.16 A schematic structural diagram of the imaging lens of Example 3-3 is shown.

[0118] like Figures 14 to 16 As shown, the imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis.

[0119] like Fig.14 , which is a schematic diagram of the structure of the imaging lens of Example 3-1. In this example, the object side surface and image side surface of the first spacer element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0120] like Fig.15 FIG. 3 is a schematic diagram of the structure of the imaging lens of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and reference may be made to the relevant description in Example 3-1, which will not be repeated here.

[0121] like Fig.16 , which is a schematic diagram of the structure of the imaging lens of Example 3-3. The difference between this example and Example 3-1 is that a third auxiliary spacer element is provided on the image side of the third spacer element P3, and the object side surface and image side surface of the third auxiliary spacer element are respectively abutted against the image side surface of the third spacer element P3 and the object side surface S7 of the fourth lens. The abutment manner of the remaining spacer elements is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0122] In summary, the structural parameters of the imaging lens of the third embodiment in the embodiments 3-1, 3-2 and 3-3 are shown in Table 8. (Unit: mm)

[0123] Table 8

[0124]

[0125] In the third embodiment, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is convex. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave.

[0126] In Example 3, the aperture value Fno of the imaging lens is 1.65, the effective focal length f of the imaging lens is 14.95 mm, the effective focal length f1 of the first lens is 19.29 mm, the effective focal length f2 of the second lens is 14.62 mm, the effective focal length f3 of the third lens is -9.30 mm, the effective focal length f4 of the fourth lens is 22.69 mm, and the effective focal length f5 of the fifth lens is -33.67 mm.

[0127] Table 9 shows a basic structural parameter table of the imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters.

[0128] Table 9

[0129]

[0130] Table 10 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface s1-s10 in Example 3.

[0131] Table 10

[0132]

[0133] Fig.17 The axial chromatic aberration curve of the imaging lens of the third embodiment is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens. Fig.18 The astigmatism curve of the imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.19 The distortion curve of the imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0134] according to Figures 17 to 19 It can be seen that the imaging lens provided in the third embodiment can achieve good imaging quality.

[0135] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship shown in Table 11.

[0136] Table 11

[0137]

[0138] Table 12 shows the effective focal length of each lens of the imaging lenses of Examples 1 to 3.

[0139] Table 12

[0140]

[0141] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.

[0142] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0143] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0144] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned 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 numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0145] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An imaging lens, characterized in that: The invention comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens group is composed of five lenses, and the five lenses are, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens; the first lens has positive optical power, the second lens has positive optical power, the third lens has negative optical power, the fourth lens has positive optical power, and the fifth lens has negative optical power; The spacer element group includes a first spacer element disposed on the image side of the first lens and in at least partial contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in at least partial contact with the image side surface of the second lens; the spacer element group also includes a third spacer element disposed on the image side of the third lens and in at least partial contact with the image side surface of the third lens; The effective focal length f1 of the first lens satisfies the following relationship with the effective focal length f of the imaging lens: 0.8 <f1 / f<1.3; The Abbe coefficient V1 of the first lens, the Abbe coefficient V2 of the second lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy: ; The image side outer diameter D1m of the first spacing element and the object side inner diameter d1s of the first spacing element satisfy: 1.05 <D1m / d1s<1.4; The entrance pupil diameter EPD of the imaging lens and the image side inner diameter d3m of the third spacing element satisfy: 0.8 <EPD / d3m<1.4。 2. The imaging lens according to claim 1, characterized in that: The spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The spacing distance EP23 from the image side surface of the second spacing element to the object side surface of the third spacing element along the optical axis, the spacing distance EP34 from the image side surface of the third spacing element to the object side surface of the fourth spacing element along the optical axis direction, and the refractive index N3 of the third lens satisfy: .

3. The imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, The central thickness CT5 of the fifth lens and the image side outer diameter D4m of the fourth spacer element satisfy: <CT5 / D4m<0.2。 4. The imaging lens according to claim 1, wherein: The object side outer diameter D1s of the first spacer element and the center thickness CT1 of the first lens satisfy: 0.1 <CT1 / D1s<0.3。 5. The imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, The effective focal length f4 of the fourth lens, the object side outer diameter D4s of the fourth spacing element, and the object side inner diameter d4s of the fourth spacing element satisfy: .

6. The imaging lens according to claim 1, wherein: The curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -1.2 <R3 / R4<-0.5; The image side inner diameter d2m of the second spacing element and the image side outer diameter D2m of the second spacing element satisfy: 0.5 <d2m / D2m<0.9。 7. The imaging lens according to claim 1, wherein: The effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -0.8 <f4 / f5<-0.4; The object side outer diameter D0s of the lens barrel and the maximum axial height L of the lens barrel satisfy: 0.8 <D0s / L<1.1。 8. The imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, The center thickness CT3 of the third lens, the center thickness CT4 of the fourth lens, the air gap T34 between the third lens and the fourth lens on the optical axis and the maximum thickness CP3 of the third spacing element satisfy: 0.4≤(CT3+CT4) / (T34+CP3)<2.

1.

9. The imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, The curvature radius R7 of the object side surface of the fourth lens and the object side inner diameter d4s of the fourth spacing element satisfy: -15 <R7 / d4s<6.1。 10. The imaging lens according to any one of claims 1 to 9, characterized in that: The object side surface of the first lens is a convex surface; The object side surface of the second lens is convex, and the image side surface is convex; The image side surface of the third lens is a concave surface; The image side surface of the fourth lens is a convex surface; The image side surface of the fifth lens is a concave surface.

Images