Optical imaging lens

Abstract

The utility model provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of four lenses, and the four lenses are a first lens, a second lens, a third lens and a fourth lens; the at least one spacer comprises a first spacer, a second spacer and a third spacer; cT1 / EP01 is more than or equal to 0.96 and less than or equal to 1.26; r3 / (D1m-d1m) is greater than or equal to-1.69 and less than or equal to-1.11. The four-piece optical imaging lens solves the problem that stray light is increased due to the fact that a four-piece optical imaging lens in the prior art meets imaging definition.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging lens. Background Technology

[0002] With the continuous upgrading and iteration of mobile electronic devices, related industries have also ushered in a wave of optimization and upgrading. Among them, the mobile phone industry, as the most representative industry, has not only driven the continuous progress of optical imaging lenses used in them, but also promoted the iterative upgrading of related technologies.

[0003] As users increasingly demand higher quality mobile phone photography, high definition and image clarity have become key requirements. Existing technology offers a four-element optical imaging lens. To achieve high image clarity, the front-end size typically needs to be increased. However, this can easily lead to an inappropriate match between the lens barrel size and the lens size, resulting in increased stray light and affecting image quality and clarity.

[0004] In other words, existing four-element optical imaging lenses suffer from increased stray light due to the need to achieve image sharpness. Utility Model Content

[0005] The main objective of this invention is to provide an optical imaging lens to solve the problem of increased stray light in existing four-element optical imaging lenses when trying to achieve image sharpness.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and at least one spacer disposed within the lens barrel. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The at least one spacer includes a first spacer disposed between the first and second lenses and in contact with the image-side surface of the first lens, a second spacer disposed between the second and third lenses and in contact with the image-side surface of the second lens, and a third spacer disposed between the third and fourth lenses and in contact with the image-side surface of the third lens. The central thickness CT1 of the first lens on the optical axis and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy the following: 0.96≤CT1 / EP01≤1.26. The outer diameter D1m of the image-side surface of the first spacer, the inner diameter d1m of the image-side surface of the first spacer, and the radius of curvature R3 of the object-side surface of the second lens satisfy the following: -1.69≤R3 / (D1m-d1m)≤-1.11.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group disposed within the lens barrel, and at least one spacer. The lens group consists of four lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power. The object side and image side of the first lens are convex; the object side and image side of the second lens are concave; the object side and image side of the third lens are concave; and the object side and image side of the fourth lens are convex. The at least one spacer includes a lens disposed within the first lens barrel. The first spacer between the first and second lenses and in contact with the image-side surface of the first lens, the second spacer between the second and third lenses and in contact with the image-side surface of the second lens, and the third spacer between the third and fourth lenses and in contact with the image-side surface of the third lens; the central thickness CT1 of the first lens on the optical axis and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy: 0.96≤CT1 / EP01≤1.26; the radius of curvature R6 of the image-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer and the refractive index of the third lens satisfy: 2.30≤d3s / R6×N3≤2.54.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group disposed within the lens barrel, and at least one spacer. The lens group consists of four lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power. The object side and image side of the first lens are convex; the object side and image side of the second lens are concave; and the object side and image side of the third lens are both concave. The object-side surface of the fourth lens is convex, and the image-side surface is concave. At least one spacer includes a first spacer placed between the first and second lenses and in contact with the image-side surface of the first lens, a second spacer placed between the second and third lenses and in contact with the image-side surface of the second lens, and a third spacer placed between the third and fourth lenses and in contact with the image-side surface of the third lens. The inner diameter d0s of the object-side end face of the lens barrel and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy the following: 3.43≤d0s / EP01≤4.76.

[0009] Furthermore, the radius of curvature R4 of the image side of the second lens and the outer diameter D2s of the object side of the second spacer satisfy the following condition: 2.68≤R4 / D2s≤14.75.

[0010] Furthermore, the outer diameter D2m of the image side of the second spacer, the inner diameter d2m of the image side of the second spacer, and the radius of curvature R5 of the object side of the third lens satisfy the following relationship: -3.51≤R5 / (D2m-d2m)≤-2.32.

[0011] Furthermore, the radius of curvature R6 of the image side of the third lens, the inner diameter d3s of the object side of the third spacer, and the refractive index of the third lens satisfy the following condition: 2.30≤d3s / R6×N3≤2.54.

[0012] Furthermore, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy the following condition: 4.53≤(CT1+CP1) / CT2≤6.35.

[0013] Furthermore, the axial spacing EP12 between the first spacer and the second spacer satisfies the following condition with respect to the center thickness CT2 of the second lens on the optical axis: 2.71≤EP12 / CT2≤3.68.

[0014] Furthermore, the axial spacing EP23 between the second and third spacers satisfies the following condition with respect to the center thickness CT3 of the third lens on the optical axis: 2.67≤EP23 / CT3≤3.27.

[0015] Furthermore, the maximum axial height L of the lens barrel, the air gap T12 between the first and second lenses on the optical axis, the air gap T23 between the second and third lenses on the optical axis, and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following condition: 6.57≤L / (T12+T23+T34)≤7.21.

[0016] Furthermore, the effective focal length f1 of the first lens and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy the following condition: 2.38≤f1 / EP01≤3.00.

[0017] Furthermore, the outer diameter D0s of the object-side end face of the lens barrel, the inner diameter d0s of the object-side end face of the lens barrel, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 0.27≤(D0s-d0s) / CT1≤1.52.

[0018] Furthermore, the inner diameter d0s of the object-side end face of the lens barrel and the radius of curvature R1 of the object-side surface of the first lens satisfy the following condition: 1.37≤d0s / R1≤1.77.

[0019] Furthermore, the radius of curvature R7 of the object side of the fourth lens, the outer diameter D3m of the image side of the third spacer, and the inner diameter d3m of the image side of the third spacer satisfy the following: 1.14≤(D3m-d3m) / R7≤1.83.

[0020] Furthermore, the axial spacing EP12 between the first spacer and the second spacer, the axial spacing EP23 between the second spacer and the third spacer, and the effective focal length f2 of the second lens satisfy the following condition: -2.25≤f2 / (EP12+EP23)≤-2.01.

[0021] Furthermore, the first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power.

[0022] Furthermore, the object-side surface of the first lens is convex, and the image-side surface is convex; the object-side surface of the second lens is concave, and the image-side surface is concave; the object-side surface of the third lens is concave, and the image-side surface is concave; and the object-side surface of the fourth lens is convex, and the image-side surface is concave.

[0023] Applying the technical solution of this utility model, the optical imaging lens of this application consists of a lens barrel, four lenses disposed within the lens barrel, and at least one spacer. By rationally arranging the positions of the four lenses, the first to third spacers, and setting the optical imaging lens to satisfy 0.96≤CT1 / EP01≤1.26, the field curvature can be adjusted while improving the system's ability to converge light, thus improving image clarity. It can also improve the matching degree between the edge field of view (CRA) of the optical imaging lens and the chip CRA, reducing the risk of color cast. However, under these conditions, the design dimensions of the lens barrel front end and the dimensions of the first lens become difficult to match, leading to an increase in stray light. Therefore, this application, by constraining -1.69≤R3 / (D1m-d1m)≤-1.11, can effectively eliminate problems such as defocus, chromatic aberration, and distortion caused by air gaps. Simultaneously, it intercepts the ineffective light path reflected by the first lens and its object-side components, which is beneficial for intercepting stray light, improving optical performance, reducing stray light spots, and improving image quality. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0025] Figure 1 A dimensioned diagram of an optical imaging lens according to an alternative embodiment of the present invention is shown;

[0026] Figure 2 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of this utility model is shown;

[0027] Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiments 1-2 of this utility model is shown;

[0028] Figures 4 to 7 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of this utility model are shown respectively.

[0029] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-1 of this utility model is shown;

[0030] Figure 9 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of this utility model is shown;

[0031] Figures 10 to 13 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of this utility model are shown respectively.

[0032] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of this utility model is shown;

[0033] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of this utility model is shown;

[0034] Figures 16 to 19 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of this utility model are shown respectively.

[0035] Figure 20 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-1 of this utility model is shown;

[0036] Figure 21 A schematic diagram of the structure of the optical imaging lens of Embodiment 4-2 of this utility model is shown;

[0037] Figures 22 to 25 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 of this utility model are shown respectively.

[0038] Figure 26 and Figure 27 Stray light path diagram and stray light energy diagram are shown for an optional example optical imaging lens when CT1 / EP01 = 0.96 and R3 / (D1m-d1m) = -1.72, respectively.

[0039] Figure 28 and Figure 29 Stray light path diagram and stray light energy diagram are shown for an optional example optical imaging lens when CT1 / EP01 = 0.96 and R3 / (D1m-d1m) = -0.96, respectively.

[0040] Figure 30 The diagram shows the stray light energy of an optical imaging lens according to an optional embodiment of the present invention when CT1 / EP01 = 0.96 and R3 / (D1m-d1m) = -1.11.

[0041] The above figures include the following reference numerals:

[0042] P0, Lens tube; 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; P1, First spacer; P2, Second spacer; P3, Third spacer. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0045] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0046] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0048] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In this application, the left side is the object side, and the right side is the image side.

[0049] To address the problem of increased stray light in existing four-element optical imaging lenses that fail to achieve the desired image sharpness, this invention provides an optical imaging lens.

[0050] like Figures 1 to 30 As shown, in an optional embodiment of this application, the optical imaging lens includes a lens barrel and a lens group and at least one spacer disposed in the lens barrel. The lens group consists of four lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The at least one spacer includes a first spacer placed between the first and second lenses and in contact with the image side of the first lens, a second spacer placed between the second and third lenses and in contact with the image side of the second lens, and a third spacer placed between the third and fourth lenses and in contact with the image side of the third lens. The center thickness CT1 of the first lens on the optical axis and the axial distance EP01 between the object side end face of the lens barrel and the first spacer satisfy the following: 0.96≤CT1 / EP01≤1.26. The outer diameter D1m of the image side of the first spacer, the inner diameter d1m of the image side of the first spacer, and the radius of curvature R3 of the object side of the second lens satisfy the following: -1.69≤R3 / (D1m-d1m)≤-1.11.

[0051] The optical imaging lens of this application consists of a lens barrel, four lenses disposed within the lens barrel, and at least one spacer. By rationally arranging the positions of the four lenses and the first to third spacers, and ensuring that the optical imaging lens satisfies 0.96≤CT1 / EP01≤1.26, the field curvature can be adjusted while improving the system's ability to converge light, thus enhancing image clarity. Furthermore, the matching degree between the edge field of view (CRA) of the optical imaging lens and the chip's CRA can be improved, reducing the risk of color cast. However, under these conditions, the design dimensions of the lens barrel's front end and the dimensions of the first lens become difficult to match, leading to an increase in stray light. Therefore, this application, by constraining -1.69≤R3 / (D1m-d1m)≤-1.11, can effectively eliminate problems such as defocus, chromatic aberration, and distortion caused by air gaps. Simultaneously, it intercepts the ineffective light path reflected from the first lens and its object-side components, which is beneficial for intercepting stray light, improving optical performance, reducing stray light spots, and enhancing image quality.

[0052] In addition, please refer to Table 1 below and Figures 26 to 30 As shown, under the premise that the optical imaging lens satisfies CT1 / EP01 = 0.96, Figure 26 and Figure 27 The stray light path diagram and stray light energy diagram are shown respectively when the optical imaging lens satisfies R3 / (D1m-d1m)=-1.72. Figure 28 and Figure 29 The stray light path diagram and stray light energy diagram are shown respectively when the optical imaging lens satisfies R3 / (D1m-d1m)=-0.96. Figure 30 The stray light energy diagram is shown when the optical imaging lens satisfies R3 / (D1m-d1m)=-1.11.

[0053] Depend on Figures 26 to 30It can be seen that when R3 / (D1m-d1m) = -1.72, a significant amount of stray light is not intercepted after multiple reflections, entering the imaging plane and forming stray spots, with relatively significant stray light energy, resulting in poor performance. When R3 / (D1m-d1m) = -0.96, some stray light is still not intercepted after multiple reflections, entering the imaging plane and forming stray spots, with relatively poor stray light energy. When R3 / (D1m-d1m) = -1.11, the first spacer effectively intercepts stray light generated at the front end, blocking the ineffective light paths reflected by the lens and its object-side components, reducing stray light spots, resulting in better performance. Therefore, when R3 / (D1m-d1m) is in the range of -1.69 to -1.11, the stray light improvement effect of the optical imaging lens is optimal. Therefore, by constraining -1.69≤R3 / (D1m-d1m)≤-1.11, this application reasonably constrains the outer diameter of the image side of the first spacer, the inner diameter of the image side of the first spacer, and the radius of curvature of the object side of the second lens. This effectively eliminates problems such as defocus, chromatic aberration, and distortion caused by air gaps. At the same time, it intercepts the invalid light path reflected by the first lens and its object side components, effectively intercepts stray light, improves optical performance, reduces stray light spots, and enhances imaging quality.

[0054] Table 1

[0055] Conditional expression R3 / (D1m-d1m)=-1.72 R3 / (D1m-d1m)=-0.96 R3 / (D1m-d1m)=-1.11 Evaluation chart Figure 26 and Figure 27 Figure 28 and Figure 29 Figure 30

[0056] In this embodiment, the radius of curvature R4 of the image-side surface of the second lens and the outer diameter D2s of the object-side surface of the second spacer satisfy the condition: 2.68 ≤ R4 / D2s ≤ 14.75. By controlling the above condition, it is beneficial to reduce the processing angle of the radius of curvature of the image-side surface of the second lens, which is beneficial to the processing and shaping of the second lens. Furthermore, by controlling the outer diameter of the object-side surface of the second spacer, a stable step difference can be obtained, which also ensures that the optical imaging lens has the characteristics of small size and maintains high image quality.

[0057] In this embodiment, the outer diameter D2m of the image-side surface of the second spacer, the inner diameter d2m of the image-side surface of the second spacer, and the radius of curvature R5 of the object-side surface of the third lens satisfy the following condition: -3.51 ≤ R5 / (D2m-d2m) ≤ -2.32. By controlling this condition, the smoothness and formability of the effective optical surface of the third lens, that is, the aspherical surface used by the third lens to transmit effective light, can be improved, ensuring that the third lens does not have a surface shape with large curvature, thus improving the image quality. At the same time, controlling the inner and outer diameters of the image-side surface of the second spacer is beneficial to improving the light-blocking efficiency of the second spacer and reducing the risk of stray light.

[0058] In this embodiment, the radius of curvature R6 of the image-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer, and the refractive index of the third lens satisfy the following condition: 2.30 ≤ d3s / R6 × N3 ≤ 2.54. By controlling this condition, the MTF performance of the assembled lens group can be significantly improved, while the distortion and aberrations of aspherical lenses can be reduced, thus improving the imaging effect. In addition, by controlling the inner diameter of the object-side surface of the third spacer, stray light paths can be effectively blocked, reducing the risk of stray light.

[0059] In this embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy the following condition: 4.53 ≤ (CT1 + CP1) / CT2 ≤ 6.35. By controlling this condition, the center thicknesses of the first and second lenses are ensured to be within a relatively reasonable range. In addition, the maximum center thickness of the lens and the maximum thickness of the spacer in contact with the lens are also controlled to avoid assembly interference and facilitate subsequent field curvature adjustment.

[0060] In this embodiment, the axial spacing EP12 between the first spacer and the second spacer satisfies the following relationship with the center thickness CT2 of the second lens on the optical axis: 2.71 ≤ EP12 / CT2 ≤ 3.68. By controlling the above formula, it is beneficial to ensure that the center thickness and edge thickness of the second lens are within a relatively reasonable range, reducing the risk of weld lines during the molding of the second lens, thereby reducing the risk of stray light caused by weld lines, improving the cleanliness of the imaging lens, reducing the demolding force when demolding the plastic lens, reducing the risk of the surface shape deviating from the design curve due to lens demolding deformation, and improving the MTF quality of the optical imaging lens.

[0061] In this embodiment, the axial spacing EP23 between the second and third spacers satisfies the following condition with respect to the center thickness CT3 of the third lens on the optical axis: 2.67 ≤ EP23 / CT3 ≤ 3.27. By controlling this condition, the center thickness and edge thickness of the third lens are kept within a relatively reasonable range, reducing the risk of weld lines during the forming of the third lens, thereby reducing the risk of stray light caused by weld lines and improving the cleanliness of the image.

[0062] In this embodiment, the maximum axial height L of the lens barrel, the air gap T12 between the first and second lenses on the optical axis, the air gap T23 between the second and third lenses on the optical axis, and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following condition: 6.57 ≤ L / (T12+T23+T34) ≤ 7.21. Specifically, the maximum axial height L of the lens barrel is the axial distance from the object-side end face to the image-side end face of the lens barrel. Controlling this condition helps maintain the stability of the air gaps between the lenses and their adjacent lenses on the optical axis, ensuring they are within a reasonable range. This improves assembly stability and consistency, facilitates field curvature adjustment, and enhances performance. Furthermore, controlling the maximum axial height of the lens barrel further aids in the overall design of the optical imaging lens, better balancing the characteristics of a small size.

[0063] In this embodiment, the effective focal length f1 of the first lens and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy the condition: 2.38 ≤ f1 / EP01 ≤ 3.00. By controlling this condition, the chromatic aberration of the first lens can be reduced, and the pixel density can be improved. At the same time, this condition can control the edge thickness and effective focal length of the first lens, which is beneficial for controlling the size of the front-end structure and avoiding excessive front-end structure size. It also helps to balance the rear focal length of the optical imaging lens, ensuring that the rear focal length can reach a relatively stable imaging focal plane position, thus ensuring better stability of the optical imaging lens during use.

[0064] In this embodiment, the outer diameter D0s of the object-side end face of the lens barrel, the inner diameter d0s of the object-side end face of the lens barrel, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 0.27≤(D0s-d0s) / CT1≤1.52. Controlling this condition facilitates the overall head design of the optical imaging lens, allowing it to accommodate the characteristics of a small head, while effectively controlling incident light and reducing stray light risks. Furthermore, controlling the center thickness of the first lens helps reduce the risk of fusion lines and improves image quality.

[0065] In this embodiment, the inner diameter d0s of the object-side end face of the lens barrel and the radius of curvature R1 of the object-side surface of the first lens satisfy the following relationship: 1.37 ≤ d0s / R1 ≤ 1.77. By controlling the above relationship, the amount of light entering the optical imaging lens can be significantly improved, while ensuring the rationality of the surface shape of the object-side surface of the first lens, avoiding interference between the first lens and the lens barrel, which is beneficial to improving the relative illumination of the optical imaging lens and improving the field of view.

[0066] In this embodiment, the radius of curvature R7 of the object-side surface of the fourth lens, the outer diameter D3m of the image-side surface of the third spacer, and the inner diameter d3m of the image-side surface of the third spacer satisfy the following condition: 1.14 ≤ (D3m - d3m) / R7 ≤ 1.83. By controlling this condition, the light-blocking efficiency of the third spacer can be effectively improved. Furthermore, when the apertures of the object-side and image-side surfaces of the third spacer are within this range, the risks of baking deformation and assembly misalignment of the third spacer can be significantly reduced, thereby reducing the generation of light leakage and stray light caused by spacer deformation and assembly misalignment. In addition, this condition can improve the smoothness and formability of the optically effective surface of the fourth lens, as well as improve the imaging quality.

[0067] In this embodiment, the axial spacing EP12 between the first and second spacers, the axial spacing EP23 between the second and third spacers, and the effective focal length f2 of the second lens satisfy the following condition: -2.25 ≤ f2 / (EP12+EP23) ≤ -2.01. Controlling this condition helps reduce the processing angle of the curvature radius of the second and third lenses, which is beneficial for processing and shaping; it also helps control the effective focal length of the second lens, which is beneficial for the design of the field of view; and controlling EP12 and EP23 to satisfy the above relationship helps control the edge thickness of the second and third lenses.

[0068] In this embodiment, the first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power. By reasonably constraining the optical power of each lens, it is beneficial to reasonably constrain the light path, ensure a smooth light transition, balance aberrations, and ensure image quality.

[0069] In this embodiment, the object-side surface of the first lens is convex, and the image-side surface is also convex; the object-side surface of the second lens is concave, and the image-side surface is also concave; the object-side surface of the third lens is concave, and the image-side surface is also concave; and the object-side surface of the fourth lens is convex, and the image-side surface is concave. By reasonably constraining the surface shape of each lens, it is beneficial to reasonably constrain the light refraction angle, ensure a smooth light transition, correct aberrations, improve distortion, and ensure image quality.

[0070] Optionally, the optical imaging lens in the embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. During the simulation process using such software and / or tools, the surface profile of each lens can be appropriately adjusted according to the surface profile simulation provided by the software and / or tools used.

[0071] In another optional embodiment of this application, an optical imaging lens is provided, including a lens barrel, a lens group disposed in the lens barrel, and at least one spacer. The lens group consists of four lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power. The object side and image side of the first lens are convex. The object side and image side of the second lens are concave. The object side and image side of the third lens are concave. The object side and image side of the fourth lens are convex. The at least one spacer includes a spacer disposed in a... A first spacer between the first and second lenses and in contact with the image-side surface of the first lens; a second spacer between the second and third lenses and in contact with the image-side surface of the second lens; and a third spacer between the third and fourth lenses and in contact with the image-side surface of the third lens; the center thickness CT1 of the first lens on the optical axis and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy: 0.96≤CT1 / EP01≤1.26; the radius of curvature R6 of the image-side surface of the third lens, the inner diameter d3s of the object-side surface of the third spacer, and the refractive index of the third lens satisfy: 2.30≤d3s / R6×N3≤2.54.

[0072] The optical imaging lens of this application consists of a lens barrel, four lenses disposed within the lens barrel, and at least one spacer. By rationally arranging the positions of the four lenses, the first to the third spacers, and ensuring the optical imaging lens satisfies 0.96≤CT1 / EP01≤1.26, the field curvature can be adjusted while enhancing the system's light-gathering ability, improving image clarity, and also improving the matching degree between the edge field-of-view (CRA) of the optical imaging lens and the chip CRA, reducing the risk of color cast. However, under this condition, the design dimensions of the lens barrel front end and the dimensions of the first lens become difficult to match, leading to an increase in stray light. Therefore, this application, by constraining 2.30≤d3s / R6×N3≤2.54, can significantly improve the MTF performance of the assembled lens group, while reducing distortion and aberrations of aspherical lenses, thus improving the imaging effect; in addition, by controlling the inner diameter of the object side of the third spacer, stray light paths can be effectively blocked, reducing the risk of stray light.

[0073] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0074] In another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel, a lens group disposed in the lens barrel, and at least one spacer. The lens group consists of four lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, and a fourth lens. The first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power. The object side and image side of the first lens are convex. The object side and image side of the second lens are concave. The object side and image side of the third lens are concave. The object side of the fourth lens is concave; the object side of the fourth lens is convex and the image side is concave; at least one spacer includes a first spacer placed between the first and second lenses and in contact with the image side of the first lens, a second spacer placed between the second and third lenses and in contact with the image side of the second lens, and a third spacer placed between the third and fourth lenses and in contact with the image side of the third lens; the inner diameter d0s of the object side end face of the lens barrel and the axial distance EP01 between the object side end face of the lens barrel and the first spacer satisfy: 3.43≤d0s / EP01≤4.76.

[0075] The optical imaging lens of this application consists of a lens barrel, four lenses disposed in the lens barrel, and at least one spacer. By reasonably arranging the positions of the four lenses, the first spacer to the third spacer, and setting the optical imaging lens to satisfy 3.43≤d0s / EP01≤4.76, sufficient light can be ensured to enter the lens barrel, which is beneficial to ensuring image clarity. At the same time, it can constrain the thickness of the front-end structure, avoid the situation where the front-end structure is too large and causes physical interference during assembly, and help to avoid the occurrence of new stray light in the front-end structure, thus ensuring image quality.

[0076] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0077] The optical imaging lens in this application may employ multiple lenses, such as the four lenses described above. In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0078] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although four lenses have been described as an example in the embodiments, the optical imaging lens is not limited to including four lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0079] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The parameters D0s, D2s, d0s, d3s, d3m, d2m, d1m, D1m, D3m, EP01, EP12, EP23, CP1, and L are clearly and intuitively indicated to provide a clear understanding of their meaning. To facilitate the description of the optical imaging lens and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0080] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lenses applicable to the above embodiments.

[0081] It should be noted that in the following Embodiment 1, there are two examples: Embodiment 1-1 and Embodiment 1-2; in Embodiment 2, there are two examples: Embodiment 2-1 and Embodiment 2-2; in Embodiment 3, there are two examples: Embodiment 3-1 and Embodiment 3-2; and in Embodiment 4, there are two examples: Embodiment 4-1 and Embodiment 4-2. In the two examples within the same embodiment, the curvature radius, center thickness, and other parameters of the optical imaging lens from the first to the fourth lens, as well as the spacing distance between the lenses and the higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first spacer, and the third spacer are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0082] It should be noted that any one of the examples in Embodiments 1 to 4 described below is applicable to all implementations of this application.

[0083] Example 1

[0084] like Figures 2 to 7 As shown, the optical imaging lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical imaging lens of Embodiments 1-2 is shown.

[0085] like Figure 2 and Figure 3As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, and a fourth lens E4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0086] like Figure 2 The diagram shows a schematic of the optical imaging lens in Embodiment 1-1. In this example, the object-side and image-side of the first spacer P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively.

[0087] like Figure 3 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 1-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0088] In summary, the structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1 and 1-2 are shown in Table 2.

[0089] Table 2

[0090]

[0091]

[0092] In Embodiment 1, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, 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 concave.

[0093] In Example 1, the effective focal length f1 of the first lens is 3.99 mm, the effective focal length f2 of the second lens is -3.91 mm, the effective focal length f3 of the third lens is -2.63 mm, and the effective focal length f4 of the fourth lens is 2.57 mm.

[0094] Table 3 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0095] Table 3

[0096]

[0097] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the fourth lens E4 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0098]

[0099] Where x is the distance vector from the vertex of the aspherical surface at a height of 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 reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 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 S1-S8 in Example 1.

[0100] Table 4

[0101]

[0102]

[0103] Figure 4 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 5 The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6 The distortion curve of the optical imaging lens of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 7 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0104] according to Figures 4 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0105] Example 2

[0106] like Figures 8 to 13 As shown, the optical imaging lens of Embodiment 2 is described. Figure 8 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown.

[0107] like Figure 8 and Figure 9As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, and a fourth lens E4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0108] like Figure 8 The diagram shows a schematic of the optical imaging lens in Embodiment 2-1. In this example, the object-side and image-side of the first spacer P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively.

[0109] like Figure 9 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0110] In summary, the structural parameters of the optical imaging lens in Embodiment 2 under Embodiments 2-1 and 2-2 are shown in Table 5.

[0111] Table 5

[0112]

[0113]

[0114] In Embodiment 2, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, 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 concave.

[0115] In Example 2, the effective focal length f1 of the first lens is 3.84 mm, the effective focal length f2 of the second lens is -4.12 mm, the effective focal length f3 of the third lens is -2.66 mm, and the effective focal length f4 of the fourth lens is 2.72 mm.

[0116] Table 6 shows the basic structural parameters of the optical imaging lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0117] Table 6

[0118]

[0119] Table 7 below shows 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 S1-S8 in Example 2.

[0120] Table 7

[0121] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.98E-02 -1.61E-02 -3.80E-03 -4.98E-04 -4.44E-05 8.51E-05 3.24E-05 S2 2.49E-01 -2.99E-02 2.82E-03 1.33E-03 -4.83E-04 6.99E-04 -3.43E-04 S3 4.55E-01 -1.90E-02 9.61E-04 3.85E-03 -1.98E-03 1.64E-03 -1.09E-03 S4 -7.89E-02 1.74E-02 -1.54E-02 7.39E-03 -3.16E-03 2.31E-03 -1.42E-03 S5 3.31E-01 7.26E-04 -1.26E-02 8.65E-03 -4.76E-03 3.02E-03 -1.42E-03 S6 -3.62E-01 9.00E-02 -3.05E-02 1.33E-02 -5.62E-03 2.32E-03 -8.63E-04 S7 -5.38E-01 8.57E-02 -2.45E-02 8.26E-03 -2.65E-03 9.78E-04 -2.93E-04 S8 2.93E-02 -5.82E-03 -1.05E-03 7.58E-05 1.65E-04 -5.23E-05 4.95E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.68E-05 5.21E-06 6.64E-06 7.17E-06 4.23E-06 2.09E-06 1.92E-06 S2 2.67E-04 -1.25E-04 8.77E-05 -5.18E-05 1.80E-06 -1.78E-06 -3.94E-06 S3 8.11E-04 -5.87E-04 3.77E-04 -2.77E-04 1.28E-04 -4.71E-05 1.66E-05 S4 7.23E-04 -1.10E-03 7.37E-04 -4.84E-04 1.40E-04 8.34E-05 -4.67E-06 S5 5.98E-04 -8.84E-04 5.18E-04 -3.48E-04 6.33E-05 6.31E-05 1.52E-05 S6 3.84E-04 -2.20E-04 9.39E-05 -6.09E-05 1.27E-05 -1.27E-05 1.21E-06 S7 1.25E-04 -4.51E-05 1.87E-05 -1.11E-05 2.32E-06 -1.47E-06 -2.01E-07 S8 -8.52E-06 8.76E-06 -1.58E-06 2.15E-07 -2.59E-07 1.09E-07 -9.25E-07

[0122] Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12 The distortion curve of the optical imaging lens of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0123] according to Figures 10 to 13 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0124] Example 3

[0125] like Figures 14 to 19 As shown, the optical imaging lens of Embodiment 3 is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown.

[0126] like Figure 14 and Figure 15 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, and a fourth lens E4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0127] like Figure 14 The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. In this example, the object-side and image-side of the first spacer P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively.

[0128] like Figure 15 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0129] In summary, the structural parameters of the optical imaging lens in Embodiment 3 under Embodiments 3-1 and 3-2 are shown in Table 8.

[0130] Table 8

[0131] Parameters / Examples 3-1 3-2 d1m(mm) 4.265 4.246 D1m(mm) 6.440 5.890 d2m(mm) 3.906 3.857 D2s(mm) 6.540 5.790 D2m(mm) 6.540 5.790 d3s(mm) 3.566 3.592 d3m(mm) 3.566 3.592 D3m(mm) 6.640 5.690 d0s(mm) 5.543 6.485 D0s(mm) 7.559 7.693 CP1(mm) 0.016 0.014 EP01(mm) 1.590 1.407 EP12(mm) 0.934 0.925 EP23(mm) 0.951 1.035 L(mm) 4.385 4.129

[0132] In Embodiment 3, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, 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 concave.

[0133] In Example 3, the effective focal length f1 of the first lens is 3.80 mm, the effective focal length f2 of the second lens is -4.06 mm, the effective focal length f3 of the third lens is -2.68 mm, and the effective focal length f4 of the fourth lens is 2.74 mm.

[0134] Table 9 shows the basic structural parameters of the optical imaging lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0135] Table 9

[0136]

[0137] Table 10 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1-S8 in Example 3.

[0138] Table 10

[0139] Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.73E-02 -1.86E-02 -4.94E-03 -8.61E-04 -1.51E-04 9.64E-05 3.93E-05 S2 2.31E-01 -2.85E-02 2.00E-03 2.35E-03 -8.77E-04 1.08E-03 -5.95E-04 S3 4.28E-01 -1.16E-02 -1.16E-03 6.12E-03 -2.99E-03 2.38E-03 -1.57E-03 S4 -7.11E-02 2.04E-02 -1.62E-02 7.73E-03 -3.34E-03 2.43E-03 -1.37E-03 S5 3.22E-01 9.44E-03 -1.57E-02 9.38E-03 -5.12E-03 3.14E-03 -1.30E-03 S6 -3.65E-01 9.85E-02 -3.22E-02 1.39E-02 -5.96E-03 2.37E-03 -7.66E-04 S7 -5.37E-01 8.40E-02 -2.38E-02 8.07E-03 -2.59E-03 8.91E-04 -2.08E-04 S8 2.13E-02 -7.33E-03 -8.23E-04 1.12E-04 1.45E-04 -7.12E-05 6.75E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 2.77E-05 4.63E-06 3.24E-06 4.13E-06 2.34E-06 3.07E-06 4.07E-06 S2 5.09E-04 -2.60E-04 1.94E-04 -9.91E-05 2.45E-05 -3.38E-06 -1.52E-05 S3 1.34E-03 -9.13E-04 6.67E-04 -4.56E-04 2.26E-04 -1.00E-04 1.97E-05 S4 1.20E-03 -8.87E-04 7.29E-04 -5.85E-04 1.01E-04 6.08E-05 -1.01E-05 S5 7.20E-04 -4.07E-04 3.59E-04 -3.17E-04 -1.63E-05 5.66E-05 1.81E-06 S6 2.31E-04 -8.34E-05 4.49E-05 -3.01E-05 9.55E-06 -1.13E-05 -2.31E-06 S7 4.98E-05 -1.01E-05 6.55E-06 -7.65E-06 3.38E-06 -7.14E-07 5.52E-08 S8 -2.34E-05 9.04E-06 -3.93E-08 -1.64E-06 1.17E-06 4.27E-07 -8.37E-07

[0140] Figure 16 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 17 The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 18 The distortion curve of the optical imaging lens of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 19The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0141] according to Figures 16 to 19 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0142] Example 4

[0143] like Figures 20 to 25 As shown, the optical imaging lens of Embodiment 4 is described. Figure 20 A schematic diagram of the optical imaging lens of Embodiment 4-1 is shown. Figure 21 A schematic diagram of the optical imaging lens of Embodiment 4-2 is shown.

[0144] like Figure 20 and Figure 21 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, and a fourth lens E4 arranged sequentially from the object side to the image side in the lens barrel P0.

[0145] like Figure 20 The diagram shows a schematic of the optical imaging lens in Embodiment 4-1. In this example, the object-side and image-side of the first spacer P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively.

[0146] like Figure 21 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 4-2. In this example, the bearing and contact method of each spacer is the same as that of Embodiment 4-1, and can be referred to the relevant description in Embodiment 4-1, which will not be repeated here.

[0147] In summary, the structural parameters of the optical imaging lens of Embodiment 4 under Embodiments 4-1 and 4-2 are shown in Table 11.

[0148] Table 11

[0149] Parameters / Examples 4-1 4-2 d1m(mm) 4.215 4.274 D1m(mm) 6.588 5.870 d2m(mm) 3.996 3.916 D2s(mm) 6.688 5.770 D2m(mm) 6.688 5.770 d3s(mm) 3.580 3.672 d3m(mm) 3.580 3.672 D3m(mm) 6.788 5.670 d0s(mm) 5.517 6.580 D0s(mm) 7.867 7.122 CP1(mm) 0.026 0.028 EP01(mm) 1.607 1.507 EP12(mm) 0.847 0.851 EP23(mm) 1.020 1.099 L(mm) 4.471 4.343

[0150] In Embodiment 4, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is convex. The object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is concave, 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 concave.

[0151] In Example 4, the effective focal length f1 of the first lens is 3.83 mm, the effective focal length f2 of the second lens is -4.20 mm, the effective focal length f3 of the third lens is -2.67 mm, and the effective focal length f4 of the fourth lens is 2.76 mm.

[0152] Table 12 shows the basic structural parameters of the optical imaging lens in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0153] Table 12

[0154]

[0155]

[0156] Table 13 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 S1-S8 in Example 4.

[0157] Table 13

[0158] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.35E-02 -1.19E-02 -1.42E-03 3.49E-04 2.07E-04 1.37E-04 3.86E-05 S2 2.59E-01 -2.85E-02 6.07E-03 1.33E-03 1.14E-04 7.53E-04 -2.21E-04 S3 4.54E-01 -2.76E-02 4.79E-03 1.63E-03 -7.49E-04 1.36E-03 -9.56E-04 S4 -1.12E-01 4.57E-03 -1.22E-02 6.47E-03 -2.20E-03 2.39E-03 -1.61E-03 S5 3.75E-01 -1.12E-02 -1.11E-02 8.33E-03 -4.13E-03 3.13E-03 -1.26E-03 S6 -3.18E-01 8.57E-02 -2.98E-02 1.26E-02 -5.16E-03 2.09E-03 -6.53E-04 S7 -5.31E-01 8.27E-02 -2.34E-02 7.71E-03 -2.47E-03 8.85E-04 -2.42E-04 S8 1.57E-02 -6.79E-03 -9.07E-04 -1.59E-05 1.25E-04 -5.00E-05 4.40E-05 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.29E-05 4.66E-06 5.89E-08 -2.62E-08 -2.51E-06 -3.71E-06 -2.84E-06 S2 2.70E-04 -1.24E-04 4.47E-05 -4.69E-05 -1.24E-05 -1.05E-05 -5.24E-06 S3 8.42E-04 -6.91E-04 3.97E-04 -2.71E-04 1.15E-04 -4.93E-05 2.06E-05 S4 7.59E-04 -1.31E-03 1.03E-03 -5.34E-04 1.08E-04 7.42E-05 -1.34E-05 S5 5.13E-04 -9.60E-04 5.96E-04 -2.48E-04 -1.87E-05 5.62E-05 5.76E-06 S6 2.67E-04 -1.56E-04 4.79E-05 -5.03E-05 9.16E-06 -1.19E-05 -2.28E-06 S7 1.07E-04 -3.40E-05 1.50E-05 -1.21E-05 1.50E-06 -7.21E-07 2.51E-07 S8 -5.76E-06 8.40E-06 -1.00E-06 -6.56E-07 -8.40E-07 8.98E-07 -8.97E-07

[0159] Figure 22 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the imaging lens. Figure 23 The astigmatism curve of the optical imaging lens of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24 The distortion curve of the optical imaging lens of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 25 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0160] according to Figures 22 to 25 It can be seen that the optical imaging lens given in Example 4 can achieve good imaging quality.

[0161] In summary, Examples 1 to 4 satisfy the relationships shown in Table 14.

[0162] Table 14

[0163]

[0164]

[0165] Table 15 shows the effective focal lengths of each lens in the optical imaging lenses of Embodiments 1 to 4.

[0166] Table 15.

[0167] Parameters / Examples one two three Four f1(mm) 3.99 3.84 3.80 3.83 f2 (mm) -3.91 -4.12 -4.06 -4.20 f3 (mm) -2.63 -2.66 -2.68 -2.67 f4 (mm) 2.57 2.72 2.74 2.76

[0168] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0169] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0170] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0171] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0172] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An optical imaging lens, characterized in that, Includes a lens barrel, a lens assembly disposed within the lens barrel, and at least one spacer. The lens group consists of four lenses, which are arranged in the order of first lens, second lens, third lens and fourth lens from object side to image side; The at least one spacer includes a first spacer placed between the first lens and the second lens and in contact with the image-side portion of the first lens, a second spacer placed between the second lens and the third lens and in contact with the image-side portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image-side portion of the third lens. The central thickness CT1 of the first lens on the optical axis and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy: 0.96≤CT1 / EP01≤1.26; the outer diameter D1m of the image-side surface of the first spacer, the inner diameter d1m of the image-side surface of the first spacer and the radius of curvature R3 of the object-side surface of the second lens satisfy: -1.69≤R3 / (D1m-d1m)≤-1.

11.

2. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R4 of the image side of the second lens and the outer diameter D2s of the object side of the second spacer satisfy the following condition: 2.68≤R4 / D2s≤14.

75.

3. The optical imaging lens according to claim 1, characterized in that, The outer diameter D2m of the image-side surface of the second spacer, the inner diameter d2m of the image-side surface of the second spacer, and the radius of curvature R5 of the object-side surface of the third lens satisfy the following relationship: -3.51≤R5 / (D2m-d2m)≤-2.

32.

4. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R6 of the image side of the third lens, the inner diameter d3s of the object side of the third spacer, and the refractive index of the third lens satisfy the following condition: 2.30≤d3s / R6×N3≤2.

54.

5. The optical imaging lens according to claim 1, characterized in that, The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy the following condition: 4.53≤(CT1+CP1) / CT2≤6.

35.

6. The optical imaging lens according to claim 1, characterized in that, The axial spacing EP12 between the first spacer and the second spacer satisfies the following relationship with the center thickness CT2 of the second lens on the optical axis: 2.71≤EP12 / CT2≤3.

68.

7. The optical imaging lens according to claim 1, characterized in that, The axial spacing EP23 between the second spacer and the third spacer satisfies the following relationship with the center thickness CT3 of the third lens on the optical axis: 2.67≤EP23 / CT3≤3.

27.

8. The optical imaging lens according to claim 1, characterized in that, The maximum axial height L of the lens barrel, the air gap T12 between the first lens and the second lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following condition: 6.57≤L / (T12+T23+T34)≤7.

21.

9. The optical imaging lens according to claim 1, characterized in that, The effective focal length f1 of the first lens and the axial distance EP01 between the object-side end face of the lens barrel and the first spacer satisfy the following condition: 2.38≤f1 / EP01≤3.

00.

10. The optical imaging lens according to claim 1, characterized in that, The outer diameter D0s of the object-side end face of the lens barrel, the inner diameter d0s of the object-side end face of the lens barrel, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 0.27≤(D0s-d0s) / CT1≤1.

52.

11. The optical imaging lens according to claim 1, characterized in that, The inner diameter d0s of the object-side end face of the lens barrel and the radius of curvature R1 of the object-side surface of the first lens satisfy the following condition: 1.37≤d0s / R1≤1.

77.

12. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R7 of the object side of the fourth lens, the outer diameter D3m of the image side of the third spacer, and the inner diameter d3m of the image side of the third spacer satisfy the following condition: 1.14≤(D3m-d3m) / R7≤1.

83.

13. The optical imaging lens according to claim 1, characterized in that, The axial spacing EP12 between the first spacer and the second spacer, the axial spacing EP23 between the second spacer and the third spacer, and the effective focal length f2 of the second lens satisfy the following condition: -2.25≤f2 / (EP12+EP23)≤-2.

01.

14. The optical imaging lens according to any one of claims 1 to 13, characterized in that, The first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, and the fourth lens has positive optical power.

15. The optical imaging lens according to any one of claims 1 to 13, characterized in that, The first lens has a convex object-side surface and a convex image-side surface; the second lens has a concave object-side surface and a concave image-side surface; the third lens has a concave object-side surface and a concave image-side surface; and the fourth lens has a convex object-side surface and a concave image-side surface.

Images