An optical imaging lens

Abstract

This application discloses an optical imaging lens, whose lens group consists of seven lenses, with a fourth spacer element provided between the fourth and fifth lenses. The radius of curvature R7 of the object-side surface of the fourth lens, the radius of curvature R8 of the image-side surface of the fourth lens, the center thickness CT4 of the fourth lens, and the inner diameter d4s of the object-side surface of the fourth spacer element satisfy the following conditions: -44.15 < (R7 + R8) / CT4 ≤ -37.65, -4.65 ≤ R8 / d4s ≤ -3.95. The optical imaging lens of this application can effectively suppress aberrations, improve light convergence accuracy, and ensure image clarity and color accuracy.

Description

Technical Field

[0001] This application relates to the field of optical equipment technology. More specifically, this application relates to an optical imaging lens. Background Technology

[0002] As consumers continue to demand higher image quality, multi-lens optical imaging lenses have become standard equipment in mid-to-high-end smart devices. High-performance camera modules not only require lenses with high resolution, but also must be able to deliver clear and realistic images even in complex lighting conditions.

[0003] In the pursuit of high-precision imaging, traditional optimization methods often rely on post-processing algorithms to improve image quality. However, aberrations such as distortion and chromatic aberration are inherent aberrations of optical systems, stemming from the physical characteristics of light passing through lens groups. Simply relying on algorithms for post-processing compensation cannot fundamentally eliminate these aberrations, especially under conditions of large apertures or high-pixel sensors, where the limitations of algorithmic correction become increasingly apparent and cannot fully meet the ever-demanding requirements of high-precision shooting.

[0004] In view of this, there is an urgent need to provide an optical imaging lens that can effectively suppress aberrations, improve light convergence accuracy, and ensure image clarity and color accuracy. Summary of the Invention

[0005] In order to at least solve one or more of the technical problems mentioned above, this application proposes an optical imaging lens that aims to achieve coordinated control of optical and mechanical dimensions by coupling the axial and radial dimensions of the middle section of the lens. This ensures assembly stability while meeting the light deflection requirements, thereby effectively suppressing aberrations, improving light convergence accuracy, and ensuring image clarity and color accuracy.

[0006] The optical imaging lens provided in this application includes a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel;

[0007] The lens group consists of seven lenses, which are arranged in the following order along the optical axis from the object side to the image side: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with optical power, and a seventh lens with negative optical power. Each lens has an object-side surface facing the object side and an image-side surface facing the image side. The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave. The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave. The object-side surface of the third lens is convex, and the image-side surface of the third lens is concave. The object-side surface of the fourth lens is concave, and the image-side surface of the fourth lens is convex. The image-side surface of the fifth lens is convex. The object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave. The object-side surface and the image-side surface of the seventh lens are both concave. The plurality of spacers includes a fourth spacer element, which is positioned between the fourth lens and the fifth lens, and the object side of the fourth spacer element is in contact with the image side of the fourth lens. The radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the center thickness CT4 of the fourth lens, and the inner diameter d4s of the object side of the fourth spacer element satisfy the following: -44.15<(R7+R8) / CT4≤-37.65, -4.65≤R8 / d4s≤-3.95.

[0008] In some embodiments, the plurality of spacers further includes a first spacer element located between the first lens and the second lens, wherein the object side of the first spacer element is in contact with the image side of the first lens. The following conditions must be met: the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the center thickness CT1 of the first lens, the distance EP01 from the object side of the lens barrel to the object side of the first spacer element along the optical axis, and the axial displacement SAG11 from the intersection of the object side of the first lens and the optical axis to the vertex of the optical effective radius of the object side of the first lens: 7.20 < (R1 + R2) / CT1 < 8.10, 0.95 ≤ EP01 / SAG11 < 1.40.

[0009] In some embodiments, the outer diameter D1s of the object side of the first spacer element and the center thickness CT1 of the first lens satisfy the following condition: 4.55 < D1s / CT1 < 6.20.

[0010] In some embodiments, the plurality of spacers further includes a second spacer located between the second lens and the third lens, wherein the object-side surface of the second spacer is in contact with the image-side surface of the second lens. The effective focal length f2 of the second lens, the outer diameter D2s of the object side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element satisfy the following condition: -5.25≤f2 / (D2s-d2s)≤-2.74.

[0011] In some embodiments, the plurality of spacers includes a third spacer located between the third lens and the fourth lens, and the object side of the third spacer is in contact with the image side of the third lens. The effective focal length f3 of the third lens, the outer diameter D3s of the object side of the third spacer element, and the inner diameter d3s of the object side of the third spacer element satisfy the following condition: 1.80 < f3 / (D3s-d3s) < 3.90.

[0012] In some embodiments, the outer diameter D3s of the object side of the third spacer element and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 8.30 < D3s / T34 ≤ 11.66.

[0013] In some embodiments, the inner diameter d3s of the object side of the third spacer element and the distance EP34 from the image side of the third spacer element to the object side of the fourth spacer element along the optical axis satisfy the following: 4.05≤d3s / EP34≤5.00.

[0014] In some embodiments, the maximum thickness CP4 of the fourth spacer element along the optical axis, the outer diameter D4s of the object side of the fourth spacer element, and the outer diameter D4m of the image side of the fourth spacer element satisfy the following condition: 0.35 < CP4 / (D4m-D4s) < 2.40.

[0015] In some embodiments, the plurality of spacers further includes a fourth auxiliary spacer located between the fourth spacer and the fifth lens, wherein the object side of the fourth auxiliary spacer is in contact with the image side of the fourth spacer. The central thickness CT4 of the fourth lens, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the maximum thickness CP4b of the fourth auxiliary spacer element along the optical axis satisfy the following condition: 1.75 < (CT4 + T45) / (CP4 + CP4b) ≤ 2.50.

[0016] In some embodiments, the plurality of spacers further includes a fifth spacer and a sixth spacer; the fifth spacer is located between the fifth lens and the sixth lens, and the object-side surface of the fifth spacer is in contact with the image-side surface of the fifth lens; the sixth spacer is located between the sixth lens and the seventh lens, and the object-side surface of the sixth spacer is in contact with the image-side surface of the sixth lens. The effective focal length f5 of the fifth lens and the distance EP56 from the image side of the fifth spacer element to the object side of the sixth spacer element along the optical axis satisfy the following condition: 9.00 < f5 / EP56 ≤ 13.10.

[0017] In some embodiments, the radius of curvature R12 of the image side of the sixth lens, the outer diameter D6s of the object side of the sixth spacer element, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following: 1.74≤R12 / (D6s-d6s)≤3.08.

[0018] In some embodiments, the inner diameter d6s of the object side of the sixth spacer element and the vertical distance Yc62 from the critical point of the image side of the sixth lens to the optical axis satisfy the following condition: 3.80 < d6s / Yc62 < 4.85.

[0019] In some embodiments, the plurality of spacers further includes a seventh spacer, which is located on the image side of the seventh lens, and the object side of the seventh spacer is in contact with the image side of the seventh lens. The radius of curvature R14 of the image side of the seventh lens, the effective focal length f7 of the seventh lens, the distance EP67 from the image side of the sixth spacer to the object side of the seventh spacer along the optical axis, and the center thickness CT7 of the seventh lens satisfy the following conditions: -1.90 < R14 / f7 < -1.35, 1.55 < EP67 / CT7 ≤ 2.05.

[0020] In some embodiments, the maximum height L of the lens barrel, the outer diameter D0s of the object side of the lens barrel, and the outer diameter D0m of the image side of the lens barrel satisfy the following condition: 1.99≤L / (D0m-D0s)≤5.06.

[0021] In some embodiments, the effective focal length f of the optical imaging lens, the inner diameter d0s of the object side of the lens barrel, and the inner diameter d1s of the object side of the first spacer element satisfy the following condition: 3.10 < f / (d0s-d1s) < 4.95.

[0022] By controlling the radius of curvature, center thickness, and inner diameter of the object side of the fourth lens, this application regulates the refractive power of the fourth lens, ensuring the optical performance and mechanical stability of the lens in the middle section of the lens, effectively reducing optical axis offset caused by assembly problems, reducing astigmatism, and improving imaging clarity, thereby achieving the goal of suppressing inherent aberrations and ensuring high-resolution optical performance from a physical perspective. Attached Figure Description

[0023] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 A cross-sectional structural dimension annotation diagram of the optical imaging lens according to an embodiment of this application is shown; Figure 2 The defocus curves of Embodiment 3-3 of this application are shown, which satisfy (R7+R8) / CT4=-37.68 and R8 / d4s=-4.01. Figure 3 The defocus curves of Embodiment 2-2 of this application are shown, which satisfy (R7+R8) / CT4=-43.33 and R8 / d4s=-4.48. Figure 4 The defocus curve of Comparative Example 1 of this application is shown, which satisfies (R7+R8) / CT4=-45.05 and R8 / d4s=-5.02; Figure 5 The defocus curve of Comparative Example 2 of this application is shown, which satisfies (R7+R8) / CT4=-36.55 and R8 / d4s=-3.63; Figure 6 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 1-1 of this application is shown; Figure 7 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiments 1-2 of this application is shown; Figure 8 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiments 1-3 of this application is shown; Figure 9 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 10 The astigmatism curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 11 The distortion curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 12The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of this application is shown; Figure 13 A cross-sectional view of the optical imaging lens of Embodiment 2-1 of this application is shown. Figure 14 A cross-sectional view of the optical imaging lens of Embodiment 2-2 of this application is shown; Figure 15 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiments 2-3 of this application is shown; Figure 16 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 17 The astigmatism curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 18 The distortion curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 19 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of this application is shown; Figure 20 A cross-sectional view of the optical imaging lens of Embodiment 3-1 of this application is shown. Figure 21 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 3-2 of this application is shown; Figure 22 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 3-3 of this application is shown; Figure 23 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 of this application is shown; Figure 24 The astigmatism curve of the optical imaging lens of Embodiment 3 of this application is shown; Figure 25 The distortion curve of the optical imaging lens of Embodiment 3 of this application is shown; Figure 26 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of this application is shown. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0027] 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.

[0028] In this application, 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 intended to limit this application.

[0029] 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 feature.

[0030] In the accompanying drawings, for ease of illustration, the thickness, size, and shape of the lenses (hereinafter referred to as lens elements) have been slightly exaggerated. 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.

[0031] In this specification, 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.

[0032] The surface shape of a lens in the paraxial region can be determined by the R value (R refers to the radius of curvature in the paraxial region, usually the R value in the lens data database of optical software). For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface. For the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0033] In this application, the object side refers to the side of the optical imaging lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging plane. In the following text, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane.

[0034] To facilitate understanding, let's first combine... Figure 1 The dimensions of some parts of the optical imaging lens of this application are described in detail to provide a clear and intuitive understanding of what these dimensions refer to. For ease of description, the surface shapes of each lens in the optical imaging lens will be described later in specific embodiments, and these parameters will not be shown here.

[0035] Figure 1 A cross-sectional structural dimension diagram of an optical imaging lens according to an embodiment of this application is shown.

[0036] like Figure 1As shown, d0s is the inner diameter of the object-side surface of the lens barrel, D0s is the outer diameter of the object-side surface of the lens barrel, d1s is the inner diameter of the object-side surface of the first spacer element, D1s is the outer diameter of the object-side surface of the first spacer element, d2s is the inner diameter of the object-side surface of the second spacer element, D2s is the outer diameter of the object-side surface of the second spacer element, d3s is the inner diameter of the object-side surface of the third spacer element, D3s is the outer diameter of the object-side surface of the third spacer element, d4s is the inner diameter of the object-side surface of the fourth spacer element, D4s is the outer diameter of the object-side surface of the fourth spacer element, D4m is the outer diameter of the image-side surface of the fourth spacer element, d6s is the inner diameter of the object-side surface of the sixth spacer element, D6s is the outer diameter of the object-side surface of the sixth spacer element, D0m is the outer diameter of the image-side surface of the lens barrel, and SAG11 is the first The axial displacement from the intersection of the object-side surface of the lens and the optical axis to the vertex of the optical effective radius of the object-side surface of the first lens; Yc62 is the vertical distance from the critical point of the image-side surface of the sixth lens to the optical axis; L is the maximum height of the lens barrel; CP4b is the maximum thickness of the fourth auxiliary spacer along the optical axis; CP4 is the maximum thickness of the fourth spacer along the optical axis; EP01 is the distance from the object-side surface of the lens barrel to the object-side surface of the first spacer along the optical axis; EP34 is the distance from the image-side surface of the third spacer to the object-side surface of the fourth spacer along the optical axis; EP56 is the distance from the image-side surface of the fifth spacer to the object-side surface of the sixth spacer along the optical axis; EP67 is the distance from the image-side surface of the sixth spacer to the object-side surface of the seventh spacer along the optical axis.

[0037] It should be noted that embodiments of this application may also include those without bonding. Figure 1 Other dimensions described will not be elaborated here.

[0038] Furthermore, the optical axis mentioned above and below specifically refers to the central axis of symmetry of the optical imaging lens, around which all lenses are arranged coaxially. The distance along the optical axis mentioned above and below refers to the optical axis direction of the optical imaging lens, the straight-line distance between two optical surfaces (or structural features).

[0039] Next, the optical imaging lens provided in this application will be described in detail. The optical imaging lens includes a lens barrel and a lens group and a plurality of spacer elements disposed in the lens barrel.

[0040] The lens group consists of seven lenses, which are arranged sequentially from the object side to the image side along the optical axis as follows: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with optical power, and a seventh lens with negative optical power. Each lens has an object-side surface facing the object side and an image-side surface facing the image side. The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave. The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave. The object-side surface of the third lens is convex, and the image-side surface of the third lens is concave. The object-side surface of the fourth lens is concave, and the image-side surface of the fourth lens is convex. The image-side surface of the fifth lens is convex. The object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave. The object-side surface and the image-side surface of the seventh lens are both concave. The multiple spacer elements include a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fourth auxiliary spacer element, a fifth spacer element, a sixth spacer element, and a seventh spacer element.

[0041] The first spacer element is located between the first lens and the second lens, and the object-side surface of the first spacer element is in contact with the image-side surface of the first lens; the second spacer element is located between the second lens and the third lens, and the object-side surface of the second spacer element is in contact with the image-side surface of the second lens; the third spacer element is located between the third lens and the fourth lens, and the object-side surface of the third spacer element is in contact with the image-side surface of the third lens; the fourth spacer element is located between the fourth lens and the fifth lens, and the object-side surface of the fourth spacer element is in contact with the image-side surface of the fourth spacer element; the fifth spacer element is located between the fifth lens and the sixth lens, and the object-side surface of the fifth spacer element is in contact with the image-side surface of the fifth lens; the sixth spacer element is located between the sixth lens and the seventh lens, and the object-side surface of the sixth spacer element is in contact with the image-side surface of the sixth lens; the seventh spacer element is located on the image side of the seventh lens, and the object-side surface of the seventh spacer element is in contact with the image-side surface of the seventh lens.

[0042] The radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the center thickness CT4 of the fourth lens, and the inner diameter d4s of the object side of the fourth spacer element satisfy the conditions -44.15<(R7+R8) / CT4≤-37.65 and -4.65≤R8 / d4s≤-3.95.

[0043] To clearly demonstrate the specific impact of the above parameter constraints on aberration suppression, an analysis is now conducted in conjunction with the accompanying figures.

[0044] Figure 2The diagram illustrates the defocus curve of the optical imaging lens in Embodiment 3-3 of this application when (R7+R8) / CT4 is -37.68 and R8 / d4s is -4.01, i.e., simultaneously satisfying the conditions -44.15 < (R7+R8) / CT4 ≤ -37.65 and -4.65 ≤ R8 / d4s ≤ -3.95. The vertical axis represents the modulation transfer function (reflecting image sharpness), and the horizontal axis represents the defocus position (unit: mm). The curves in the figure correspond to the tangential defocus curves for 0.0 field of view (on-axis field of view), 0.4 field of view, 0.8 field of view, and 1.0 field of view (maximum field of view), and also include a diffraction-limited curve. Figure 2 As can be seen, the modulation transfer function curves corresponding to each field of view are relatively concentrated, which indicates that the lens can make the imaging sharpness of the on-axis field of view and the off-axis field of view consistent, and has good depth of focus characteristics across the entire field of view, effectively correcting off-axis aberrations, thereby achieving high resolution and good imaging performance.

[0045] Figure 3 The diagram illustrates the defocus curve of the optical imaging lens in Embodiment 2-2 of this application when (R7+R8) / CT4 is -43.33 and R8 / d4s is -4.48, i.e., simultaneously satisfying the conditions -44.15 < (R7+R8) / CT4 ≤ -37.65 and -4.65 ≤ R8 / d4s ≤ -3.95. Figure 3 As can be seen, the modulation transfer function curves corresponding to each field of view are relatively concentrated, which indicates that the lens can make the imaging sharpness of the on-axis field of view and the off-axis field of view consistent, and has good depth of focus characteristics across the entire field of view, effectively correcting off-axis aberrations, thereby achieving high resolution and good imaging performance.

[0046] Figure 4 The diagram shows the defocus curve of the optical imaging lens in Comparative Example 1 of this application when (R7+R8) / CT4 is -45.05 and R8 / d4s is -5.02, exceeding the lower limits of the conditions -44.15 < (R7+R8) / CT4 ≤ -37.65 and -4.65 ≤ R8 / d4s ≤ -3.95. Figure 4 As can be seen, the modulation transfer function curves corresponding to each field of view are relatively dispersed, with larger deviations in the edge field of view curves and a significant drop in their peak values. This indicates that the fourth lens of the lens, due to its excessively gentle curvature of the double concave surface or its excessively thin center thickness and small aperture, suffers from excessive aberration correction and vignetting. The field curves of each field of view are excessively shifted in the positive direction, affecting the final image quality.

[0047] Figure 5The diagram shows the defocus curve of the optical imaging lens in Comparative Example 2 of this application when (R7+R8) / CT4 is -36.55 and R8 / d4s is -3.63, exceeding the upper limits of the conditions -44.15 < (R7+R8) / CT4 ≤ -37.65 and -4.65 ≤ R8 / d4s ≤ -3.95. Figure 5 As can be seen, the modulation transfer function curves corresponding to each field of view are relatively dispersed, with a large offset in the edge field of view curves. This indicates that the fourth lens of this lens has insufficient aberration correction capability and cannot effectively block edge stray light due to its excessively steep curvature of the double concave surface or excessively thick center thickness and excessively large aperture. The peak value difference within each field of view is large, affecting the uniformity of the overall image quality.

[0048] Based on the above comparative analysis, it can be seen that the embodiments of this application comprehensively regulate the refractive power of the fourth lens by controlling the radius of curvature, center thickness, and inner diameter of the object side of the fourth spacer element, thereby ensuring its optical performance and mechanical stability, effectively reducing optical axis offset caused by assembly problems, reducing astigmatism, and improving imaging clarity, thus achieving the goal of suppressing inherent aberrations and ensuring high-resolution optical performance from a physical perspective.

[0049] In some embodiments of this application, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the center thickness CT1 of the first lens, the distance EP01 from the object-side surface of the lens barrel to the object-side surface of the first spacer element along the optical axis, and the axial displacement SAG11 from the intersection of the object-side surface of the first lens and the optical axis to the vertex of the optical effective radius of the object-side surface of the first lens satisfy the conditions 7.20 < (R1 + R2) / CT1 < 8.10 and 0.95 ≤ EP01 / SAG11 < 1.40. By constraining these two conditions, the deflection angle of the incident light rays passing through the first lens can be controlled, and the structural relationship between the lens barrel and the first spacer element can be optimized, thereby effectively reducing the optical axis offset or image quality degradation caused by assembly deviations, improving the transmission accuracy of the incident light rays, and ultimately improving the overall imaging quality of the lens.

[0050] In some embodiments of the application, the outer diameter D1s of the object side of the first spacer element and the center thickness CT1 of the first lens satisfy the condition 4.55 < D1s / CT1 < 6.20. By limiting the ratio D1s / CT1, it can be ensured that the size of the first spacer element matches the thickness of the first lens. A reasonable ratio range can effectively reduce stress concentration or assembly deviation caused by mismatch in spacer element size, thereby ensuring the assembly stability of the optical imaging lens and improving the final image quality.

[0051] In some embodiments of the application, the effective focal length f2 of the second lens, the outer diameter D2s of the object-side surface of the second spacer element, and the inner diameter d2s of the object-side surface of the second spacer element satisfy the condition -5.25 ≤ f2 / (D2s-d2s) ≤ -2.74. By limiting this range, it can be ensured that the channel width of light passing through the second spacer element matches the optical path of the second lens, thereby effectively blocking stray light from the edges that may enter the imaging area, reducing stray light interference with imaging, and improving the overall imaging quality of the lens.

[0052] In some embodiments of the application, the effective focal length f3 of the third lens, the outer diameter D3s of the object-side surface of the third spacer element, and the inner diameter d3s of the object-side surface of the third spacer element satisfy the condition 1.80 < f3 / (D3s-d3s) < 3.90. By limiting this range, the channel width of light passing through the third spacer element can be matched with the optical path of the third lens, thereby blocking stray light from the edges that may enter the imaging area, reducing stray light interference with imaging, and improving the overall imaging quality of the lens.

[0053] In some embodiments of the application, the outer diameter D3s of the object side of the third spacer element and the air gap T34 between the third and fourth lenses on the optical axis satisfy the condition 8.30 < D3s / T34 ≤ 11.66. Through the coordination of optics and structure, excessive divergence of the light beam when passing through the air gap between the third and fourth lenses, which leads to residual aberrations, can be greatly reduced. Simultaneously, the reduction in the field of view due to insufficient beam divergence can also be reduced. Furthermore, this structural proportion helps to effectively block stray light from the edges, allowing for reasonable control of the light propagation path within the air gap, thereby improving the overall image quality of the lens.

[0054] In some embodiments of this application, the inner diameter d3s of the object-side surface of the third spacer element and the distance EP34 from the image-side surface of the third spacer element to the object-side surface of the fourth spacer element along the optical axis satisfy the condition 4.05≤d3s / EP34≤5.00. By reasonably controlling this ratio range, the beam converged by the third lens can pass through the third spacer element at an appropriate angle, preventing light loss and image brightness reduction due to beam obstruction caused by an excessively small aperture, and also preventing the introduction of ambient stray light due to an excessively large aperture exceeding the beam width. This ensures that the beam does not diverge excessively during transmission between the third and fourth lenses, allowing the light to enter the fourth spacer element in a complete and stable form, providing a good beam foundation for the fourth lens to achieve depth aberration correction.

[0055] In some embodiments of this application, the maximum thickness CP4 of the fourth spacer element along the optical axis, the outer diameter D4s of the object side of the fourth spacer element, and the outer diameter D4m of the image side of the fourth spacer element satisfy the condition 0.35 < CP4 / (D4m - D4s) < 2.40. By limiting this ratio range, the fourth spacer element has sufficient thickness to ensure structural rigidity and reduce deformation caused by stress or temperature changes. At the same time, the overall size is controlled by a reasonable diameter difference, which helps to avoid excessive thickness leading to crowded assembly space. Thus, the fourth spacer element can fix the fourth lens with a stable structural form, effectively suppressing eccentric aberration caused by lens optical axis offset, and ensuring that the beam can be stably incident on the fifth lens along a preset path.

[0056] In some embodiments of this application, the center thickness CT4 of the fourth lens, the air gap T45 between the fourth and fifth lenses on the optical axis, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the maximum thickness CP4b of the fourth auxiliary spacer element along the optical axis satisfy the condition 1.75 < (CT4 + T45) / (CP4 + CP4b) ≤ 2.50. By limiting this ratio range, the fourth spacer element and the fourth auxiliary spacer element can provide sufficient support for the edge structure of the fourth and fifth lenses during assembly, effectively suppressing optical axis offset caused by lens installation tilt, and providing a reasonable optical path for light divergence between the fourth and fifth lenses, thus balancing the propagation path of light along the optical axis. This effectively reduces astigmatism and improves imaging quality while ensuring structural stability.

[0057] In the embodiments of this application, the effective focal length f5 of the fifth lens and the distance EP56 from the image side of the fifth spacer element to the object side of the sixth spacer element along the optical axis satisfy the condition 9.00 < f5 / EP56 ≤ 13.10. By limiting this ratio range, the optical path space and effective focusing position of light rays at the edge of the fifth lens can be constrained, allowing light rays passing through the fifth lens to enter subsequent lenses along a reasonable propagation path, thereby effectively suppressing aberrations and improving the image sharpness of the lens.

[0058] In some embodiments of this application, the radius of curvature R12 of the image side of the sixth lens, the outer diameter D6s of the object side of the sixth spacer element, and the inner diameter d6s of the object side of the sixth spacer element satisfy the condition 1.74≤R12 / (D6s-d6s)≤3.08. By limiting this ratio range, the propagation path of light through the sixth lens and the sixth spacer element can be controlled, allowing the sixth lens to make subtle corrections to the beam converged by the fifth lens, effectively correcting aberrations such as spherical aberration and coma, and improving the overall image sharpness of the lens.

[0059] In some embodiments of this application, the inner diameter d6s of the object side of the sixth spacer element and the vertical distance Yc62 from the critical point of the image side of the sixth lens to the optical axis satisfy the condition 3.80 < d6s / Yc62 < 4.85. By reasonably controlling this ratio range, the aperture of the sixth spacer element is matched with the effective emitted beam of the image side of the sixth lens, avoiding the reduction of the image-side field of view caused by the aperture being too small and blocking the effective emitted beam of the image side of the sixth lens, and also avoiding the introduction of ambient stray light due to the aperture being too large, thereby ensuring image quality.

[0060] In some embodiments of this application, the radius of curvature R14 of the image-side surface of the seventh lens, the effective focal length f7 of the seventh lens, the distance EP67 from the image-side surface of the sixth spacer element to the object-side surface of the seventh spacer element along the optical axis, and the center thickness CT7 of the seventh lens satisfy the conditional expressions -1.90 < R14 / f7 < -1.35, 1.55 < EP67 / CT7 ≤ 2.05. Through reasonable control, the ratio of the center thickness to the edge thickness of the seventh lens can be kept within a suitable range, ensuring good molding feasibility for the seventh lens. Simultaneously, the core function of the negative optical power of the biconcave surface of the seventh lens is fully utilized to ultimately compensate for residual distortion and chromatic aberration accumulated after light passes through the entire optical path, thereby achieving high imaging quality while ensuring the assembly stability of the optical imaging lens.

[0061] In some embodiments of this application, the maximum height L of the lens barrel, the outer diameter D0s of the object side of the lens barrel, and the outer diameter D0m of the image side of the lens barrel satisfy the condition 1.99≤L / (D0m-D0s)≤5.06. By limiting this range, the lens barrel has sufficient thickness to resist assembly stress and external impacts, effectively reducing optical axis misalignment of the lenses and spacers inside due to lens barrel deformation, thereby ensuring consistent sharpness across the entire field of view.

[0062] In some embodiments of this application, the effective focal length f of the optical imaging lens, the inner diameter d0s of the object-side surface of the lens barrel, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the condition 3.10 < f / (d0s-d1s) < 4.95. By limiting this ratio, the beam width entering the first lens can be constrained, achieving a reasonable balance between the light-gathering characteristics and the edge occlusion area, thereby optimizing the optical path layout, effectively reducing aberrations, and improving image sharpness.

[0063] 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.

[0064] It should be noted that in the following Embodiment 1, there are three examples: Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in Embodiment 2, there are three examples: Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3.

[0065] The optical parameters of the imaging lenses in the three examples within the same embodiment are the same, but their structural parameters differ. Therefore, the values ​​of the conditional expressions also differ in different examples within the same embodiment, and in different examples within different embodiments, but all remain within the range of values ​​satisfied by the aforementioned conditional expressions.

[0066] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to all implementations of this application.

[0067] Example 1 Figure 6 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 7 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiments 1-2 is shown. Figure 8 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiments 1-3 is shown.

[0068] like Figures 6 to 8 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, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, and a seventh spacer P7 arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0.

[0069] In Embodiment 1, the first lens E1 has positive optical power, S1 and S2 are the object-side and image-side surfaces of the first lens E1, respectively, with S1 being a convex surface and S2 a concave surface. The second lens E2 has negative optical power, S3 and S4 are the object-side and image-side surfaces of the second lens E2, respectively, with S3 being a convex surface and S4 a concave surface. The third lens E3 has positive optical power, S5 and S6 are the object-side and image-side surfaces of the third lens E3, respectively, with S5 being a convex surface and S6 a concave surface. The fourth lens E4 has negative optical power, S7 and S8 are the object-side and image-side surfaces of the fourth lens E3, respectively. The object-side and image-side surfaces of lens E4 are: S7 is concave and S8 is convex. The fifth lens E5 has positive optical power, with S9 and S10 being the object-side and image-side surfaces of lens E5, respectively, and both S9 and S10 are convex. The sixth lens E6 has negative optical power, with S11 and S12 being the object-side and image-side surfaces of lens E6, respectively, with S11 being convex and S12 being concave. The seventh lens E7 has negative optical power, with S13 and S14 being the object-side and image-side surfaces of lens E7, respectively, and both S13 and S14 are concave.

[0070] Table 1 below shows the basic optical parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3.

[0071] In Table 1 below, the units for radius of curvature and center thickness / spacing are millimeters (mm). OBJ (not shown in the figure) is the object plane, STO (not shown in the figure) is the aperture, and the aperture is set in front of the first lens E1. S15 is the object-side surface of the filter or protective glass, S16 can be the image-side surface of the filter or protective glass, and S17 is the imaging plane (S15, S16, S17 are as follows). Figure 6 As shown in the attached figures, the rest are omitted.

[0072] Table 1

[0073] As can be seen from Table 1, in Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are all aspherical.

[0074] The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula (1): Formula (1) Where h is the radial height from any point on the aspherical surface to the optical axis; x is the distance from the aspherical surface at a radial height of h along the optical axis to the vertex of the aspherical surface, i.e., the sag; 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; i is a positive integer representing the order of the aspherical term; It is the coefficient of the higher-order term of the i-th order aspherical surface (also called the aspherical correction coefficient). In the embodiments of this application, the order i takes the value of an even number from 4 to 20.

[0075] Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6...A20 that can be used for each aspherical mirror S1-S14 in Example 1.

[0076] Table 2-1

[0077] Table 2-2

[0078] The optical parameters of the optical imaging lens in Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 7 below, the structural parameters are shown in Table 8 below, and the values ​​of each conditional expression are shown in Table 9 below.

[0079] Figure 9 , Figure 10 , Figure 11 and Figure 12 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 are shown respectively.

[0080] Among them, the on-axis chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens; the astigmatism curve represents the bending distortion of the meridional and sagittal image planes; the astigmatism curve represents the distortion magnitude corresponding to different image heights; and the magnification chromatic aberration curve represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens. Figures 9 to 12 As can be seen, the optical imaging lens of Example 1 has good control over on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration, and the optical imaging lens given in Example 1 can achieve good imaging quality.

[0081] Example 2 Figure 13 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 14 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 2-2 is shown. Figure 15 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiments 2-3 is shown.

[0082] like Figures 13 to 15As 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, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, and a seventh spacer P7 arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0.

[0083] In Embodiment 2, the first lens E1 has positive optical power, S1 and S2 are the object-side and image-side surfaces of the first lens E1, respectively, with S1 being a convex surface and S2 being a concave surface. The second lens E2 has negative optical power, S3 and S4 are the object-side and image-side surfaces of the second lens E2, respectively, with S3 being a convex surface and S4 being a concave surface. The third lens E3 has positive optical power, S5 and S6 are the object-side and image-side surfaces of the third lens E3, respectively, with S5 being a convex surface and S6 being a concave surface. The fourth lens E4 has negative optical power, S7 and S8 are the object-side and image-side surfaces of the third lens E3, respectively, with S7 being a convex surface and S8 being a concave surface. The fourth lens E4 has an object-side surface and an image-side surface, with S7 being concave and S8 being convex. The fifth lens E5 has positive optical power, with S9 and S10 being the object-side surface and image-side surface of the fifth lens E5, respectively, and S9 and S10 being convex surfaces. The sixth lens E6 has positive optical power, with S11 and S12 being the object-side surface and image-side surface of the sixth lens E6, respectively, with S11 being convex and S12 being concave surfaces. The seventh lens E7 has negative optical power, with S13 and S14 being the object-side surface and image-side surface of the seventh lens E7, respectively, and S13 and S14 being concave surfaces.

[0084] Table 3 below shows the basic optical parameters of the optical imaging lens of Example 2 under Examples 2-1, 2-2, and 2-3.

[0085] In Table 3 below, the units for radius of curvature and center thickness / spacing are millimeters (mm), OBJ (not shown in the figure) is the object plane, STO (not shown in the figure) is the aperture, and the aperture is set in front of the first lens E1. S15 is the object-side surface of the filter or protective glass, S16 can be the image-side surface of the filter or protective glass, and S17 is the imaging plane.

[0086] Table 3

[0087] As shown in Table 3, in Embodiment 2, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the aforementioned formula (1). Tables 4-1 and 4-2 below give the higher-order coefficients A4, A6...A20 that can be used for each aspherical mirror S1-S14 in Embodiment 2.

[0088] Table 4-1

[0089] Table 4-2

[0090] Figure 16 , Figure 17 , Figure 18 and Figure 19 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 are shown respectively.

[0091] Among them, the on-axis chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens; the astigmatism curve represents the curvature of the meridional and sagittal image planes; the distortion curve represents the magnitude of distortion corresponding to different image heights; and the magnification chromatic aberration curve represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens. Figures 16 to 19 As can be seen, the optical imaging lens of Embodiment 2 has good control over on-axis chromatic aberration, astigmatism, distortion and magnification chromatic aberration, and the optical imaging lens given in Embodiment 2 can achieve good imaging quality.

[0092] Example 3 Figure 20 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 21 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 3-2 is shown. Figure 22 A cross-sectional structural schematic diagram of the optical imaging lens of Embodiment 3-3 is shown.

[0093] like Figures 20 to 22 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, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, and a seventh spacer P7 arranged sequentially along the optical axis from the object side to the image side in the lens barrel P0.

[0094] In Embodiment 3, the first lens E1 has positive optical power, S1 and S2 are the object-side and image-side surfaces of the first lens E1, respectively, with S1 being a convex surface and S2 a concave surface. The second lens E2 has negative optical power, S3 and S4 are the object-side and image-side surfaces of the second lens E2, respectively, with S3 being a convex surface and S4 a concave surface. The third lens E3 has positive optical power, S5 and S6 are the object-side and image-side surfaces of the third lens E3, respectively, with S5 being a convex surface and S6 a concave surface. The fourth lens E4 has negative optical power, S7 and S8 are the object-side and image-side surfaces of the fourth lens E4, respectively, with S7 being a concave surface and S8 a convex surface. The fifth lens E5 has positive optical power. S9 and S10 are the object-side and image-side surfaces of the fifth lens E5, respectively. S9 is concave and S10 is convex. The sixth lens E6 has positive optical power. S11 and S12 are the object-side and image-side surfaces of the sixth lens E6, respectively. S11 is convex and S12 is concave. The seventh lens E7 has negative optical power. S13 and S14 are the object-side and image-side surfaces of the seventh lens E7, respectively. S13 and S14 are both concave. S15 is the object-side surface of the filter or protective glass. S16 can be the image-side surface of the filter or protective glass. S17 is the imaging surface.

[0095] Table 5 below shows the basic structural parameters of the optical imaging lens of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3. The units for radius of curvature and center thickness / spacing are millimeters (mm). In Table 5, OBJ (not shown in the figure) is the object plane, and STO (not shown in the figure) is the aperture, which is set in front of the first lens E1.

[0096] Table 5

[0097] As shown in Table 5, in Embodiment 3, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the aforementioned formula (1). Tables 6-1 and 6-2 below give the higher-order coefficients A4, A6...A20 that can be used for each aspherical mirror S1-S14 in Embodiment 3.

[0098] Table 6-1

[0099] Table 6-2

[0100] Figure 23 , Figure 24 , Figure 25 and Figure 26The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens in Embodiment 3 are shown respectively. The on-axis chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens; the astigmatism curve represents the curvature of the meridional and sagittal image planes; the distortion curve represents the magnitude of distortion corresponding to different image heights; and the magnification chromatic aberration curve represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens. Figures 23 to 26 As can be seen, the optical imaging lens of Embodiment 3 has good control over on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration, and the optical imaging lens given in Embodiment 3 can achieve good imaging quality.

[0101] In summary, the optical parameters of the optical imaging lenses of Examples 1-1 to 3-3 are shown in Table 7 below, with the unit of each parameter being millimeters (mm).

[0102] Table 7

[0103] Some structural parameters of the optical imaging lenses in Examples 1-1 to 3-3 are shown in Table 8 below, in millimeters (mm).

[0104] Table 8

[0105] Furthermore, the conditions satisfied by the optical imaging lenses of Examples 1-1 to 3-3 are shown in Table 9 below.

[0106] Table 9

[0107] It should be understood that the structure or architecture described above is merely exemplary, and the implementation methods and entities of this application are not limited thereto, but can be modified without departing from the spirit of this application. It is understood that the descriptions of the various embodiments in this application emphasize the differences between the various embodiments, while their similarities or corresponding parts can be referred to mutually. For the sake of brevity, this application will not elaborate on each one.

[0108] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An optical imaging lens, characterized in that, Includes a lens barrel and a lens group and multiple spacer elements disposed in the lens barrel; The lens group consists of seven lenses, which are arranged in the following order along the optical axis from the object side to the image side: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with optical power, and a seventh lens with negative optical power. Each lens has an object-side surface facing the object side and an image-side surface facing the image side. The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave. The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave. The object-side surface of the third lens is convex, and the image-side surface of the third lens is concave. The object-side surface of the fourth lens is concave, and the image-side surface of the fourth lens is convex. The image-side surface of the fifth lens is convex. The object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is concave. The object-side surface and the image-side surface of the seventh lens are both concave. The plurality of spacers includes a fourth spacer element, which is positioned between the fourth lens and the fifth lens, and the object side of the fourth spacer element is in contact with the image side of the fourth lens. The radius of curvature R7 of the object side of the fourth lens, the radius of curvature R8 of the image side of the fourth lens, the center thickness CT4 of the fourth lens, and the inner diameter d4s of the object side of the fourth spacer element satisfy the following: -44.15<(R7+R8) / CT4≤-37.65, -4.65≤R8 / d4s≤-3.

95.

2. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a first spacer, which is located between the first lens and the second lens, and the object side of the first spacer is in contact with the image side of the first lens. The following conditions must be met: the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the center thickness CT1 of the first lens, the distance EP01 from the object side of the lens barrel to the object side of the first spacer element along the optical axis, and the axial displacement SAG11 from the intersection of the object side of the first lens and the optical axis to the vertex of the optical effective radius of the object side of the first lens: 7.20 < (R1 + R2) / CT1 < 8.10, 0.95 ≤ EP01 / SAG11 < 1.

40.

3. The optical imaging lens according to claim 2, characterized in that, The outer diameter D1s of the object side of the first spacer element and the center thickness CT1 of the first lens satisfy the following condition: 4.55 < D1s / CT1 < 6.

20.

4. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a second spacer, which is located between the second lens and the third lens, and the object side of the second spacer is in contact with the image side of the second lens. The effective focal length f2 of the second lens, the outer diameter D2s of the object side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element satisfy the following condition: -5.25≤f2 / (D2s-d2s)≤-2.

74.

5. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers includes a third spacer, which is located between the third lens and the fourth lens, and the object side of the third spacer is in contact with the image side of the third lens. The effective focal length f3 of the third lens, the outer diameter D3s of the object side of the third spacer element, and the inner diameter d3s of the object side of the third spacer element satisfy the following condition: 1.80 < f3 / (D3s-d3s) < 3.

90.

6. The optical imaging lens according to claim 5, characterized in that, The outer diameter D3s of the object side of the third spacer element and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 8.30 < D3s / T34 ≤ 11.

66.

7. The optical imaging lens according to claim 5, characterized in that, The inner diameter d3s of the object side of the third spacer element and the distance EP34 from the image side of the third spacer element to the object side of the fourth spacer element along the optical axis satisfy the following condition: 4.05≤d3s / EP34≤5.

00.

8. The optical imaging lens according to claim 1, characterized in that, The maximum thickness CP4 of the fourth spacer along the optical axis, the outer diameter D4s of the object side of the fourth spacer, and the outer diameter D4m of the image side of the fourth spacer satisfy the following condition: 0.35 < CP4 / (D4m-D4s) < 2.

40.

9. The optical imaging lens according to claim 8, characterized in that, The plurality of spacers also includes a fourth auxiliary spacer, which is located between the fourth spacer and the fifth lens, and the object side of the fourth auxiliary spacer is in contact with the image side of the fourth spacer. The central thickness CT4 of the fourth lens, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the maximum thickness CP4b of the fourth auxiliary spacer element along the optical axis satisfy the following condition: 1.75 < (CT4 + T45) / (CP4 + CP4b) ≤ 2.

50.

10. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers further includes a fifth spacer and a sixth spacer; the fifth spacer is located between the fifth lens and the sixth lens, and the object side of the fifth spacer is in contact with the image side of the fifth lens; the sixth spacer is located between the sixth lens and the seventh lens, and the object side of the sixth spacer is in contact with the image side of the sixth lens. The effective focal length f5 of the fifth lens and the distance EP56 from the image side of the fifth spacer element to the object side of the sixth spacer element along the optical axis satisfy the following condition: 9.00 < f5 / EP56 ≤ 13.

10.

11. The optical imaging lens according to claim 10, characterized in that, The radius of curvature R12 of the image side of the sixth lens, the outer diameter D6s of the object side of the sixth spacer element, and the inner diameter d6s of the object side of the sixth spacer element satisfy the following condition: 1.74≤R12 / (D6s-d6s)≤3.

08.

12. The optical imaging lens according to claim 11, characterized in that, The inner diameter d6s of the object side of the sixth spacer element and the vertical distance Yc62 from the critical point of the image side of the sixth lens to the optical axis satisfy the following condition: 3.80 < d6s / Yc62 < 4.

85.

13. The optical imaging lens according to claim 10, characterized in that, The plurality of spacers also includes a seventh spacer, which is located on the image side of the seventh lens, and the object side of the seventh spacer is in contact with the image side of the seventh lens. The radius of curvature R14 of the image side of the seventh lens, the effective focal length f7 of the seventh lens, the distance EP67 from the image side of the sixth spacer to the object side of the seventh spacer along the optical axis, and the center thickness CT7 of the seventh lens satisfy the following conditions: -1.90 < R14 / f7 < -1.35, 1.55 < EP67 / CT7 ≤ 2.

05.

14. The optical imaging lens according to claim 1, characterized in that, The maximum height L of the lens tube, the outer diameter D0s of the object side of the lens tube, and the outer diameter D0m of the image side of the lens tube satisfy the following condition: 1.99≤L / (D0m-D0s)≤5.

06.

15. The optical imaging lens according to claim 2, characterized in that, The effective focal length f of the optical imaging lens, the inner diameter d0s of the object side of the lens barrel, and the inner diameter d1s of the object side of the first spacer element satisfy the following condition: 3.10 < f / (d0s-d1s) < 4.95.

Images