Optical imaging lens

Abstract

The utility model provides an optical imaging lens, the number of the optical imaging lens is seven, the optical imaging lens comprises a lens group, a spacing element group and a lens barrel, the curvature radius R12 of the image side surface of a sixth lens and the outer diameter D6s of the object side surface of a sixth spacing element satisfy the following conditions:-2.72 < = R12 / D6s < =-1.15; and the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacing element and the inner diameter d6m of the image side surface of the sixth spacing element meet the condition that R13 / (D6m-d6m) is more than or equal to 10.25 and less than or equal to 11.08. The problem that the rear end of an optical imaging lens in the prior art generates serious aberration is solved.

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 development of smartphones, the optical imaging lenses of mobile phone cameras need to maintain image quality while achieving miniaturization and thinness. The number of lenses in an optical imaging lens has a critical impact on image quality, but increasing the number of lenses in a limited space reduces design freedom, especially for seven-element optical imaging lenses where the shape of the rear lens needs to balance manufacturability and structural stability, further increasing design difficulty. However, in controlling the shape of the rear lens, the sixth and seventh lenses can easily result in poor light constraint, leading to significant field curvature and stray light in the final image. Therefore, controlling the shape of the rear lens and the inner and outer diameters of the spacer elements to improve image quality while ensuring the manufacturability and structural stability of the rear lens is a crucial issue. Utility Model Content

[0003] The main objective of this invention is to provide an optical imaging lens to solve the problem of severe aberrations at the rear end of existing optical imaging lenses.

[0004] To achieve the above objectives, this utility model provides an optical imaging lens. The optical imaging lens has seven lenses with optical power. The optical imaging lens includes: a lens group, from the object side to the image side of the optical imaging lens, including a first lens to a seventh lens arranged sequentially at intervals; a spacer element group, which includes at least a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image side of the sixth lens; and a lens barrel, in which the lens group and the spacer element group are housed. The radius of curvature R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacer element satisfy the following: -2.72≤R12 / D6s≤-1.15; the radius of curvature R13 of the object side of the seventh lens, the outer diameter D6m of the image side of the sixth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy the following: 10.25≤R13 / (D6m-d6m)≤11.08.

[0005] According to another aspect of the present invention, an optical imaging lens is provided, the optical imaging lens having seven lenses of optical power, the optical imaging lens comprising: a lens group, the lens group comprising a first lens to a seventh lens arranged sequentially at intervals from the object side to the image side of the optical imaging lens; a spacer element group, the spacer element group including at least a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; a lens barrel, the lens group and the spacer element group being housed within the lens barrel; wherein the spacer element group further includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, and a spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. The second spacer element, the air gap T12 between the first and second lenses on the optical axis of the optical imaging lens, the air gap T23 between the second and third lenses on the optical axis, and the gap EP12 between the first and second spacer elements along the optical axis satisfy: 1.21≤(T12+T23) / EP12≤1.96; the spacer element group also includes a second spacer element located between the second and third lenses and in at least partial contact with the image side of the second lens, the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy: -104.78≤f2 / (CT2+CP2)≤-68.8.

[0006] Furthermore, the spacer group also includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the spacing EP34 between the third spacer element and the fourth spacer element along the optical axis of the optical imaging lens satisfy the following: 11.97≤f4 / EP34≤36.67.

[0007] Furthermore, the spacer group also includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens. The air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens and the maximum thickness CP3 of the third spacer element satisfy the following: 2.54≤T34 / CP3≤4.63.

[0008] Furthermore, the spacer element group also includes a first spacer element located between the first lens and the second lens and in at least partial contact with the image side of the first lens. The effective focal length f1 of the first lens, the distance EP01 between the object side end face of the lens barrel and the first spacer element along the optical axis of the optical imaging lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 3.08≤f1 / (EP01+CT1)≤3.7.

[0009] Furthermore, the spacer element group also includes a first spacer element located between the first lens and the second lens and in at least partial contact with the image side of the first lens, and a second spacer element located between the second lens and the third lens and in at least partial contact with the image side of the second lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the gap EP12 between the first spacer element and the second spacer element along the optical axis satisfy the following: 1.21≤(T12+T23) / EP12≤1.96.

[0010] Furthermore, the spacer element group also includes a second spacer element located between the second lens and the third lens and in at least partial contact with the image side of the second lens. The effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy the following: -104.78≤f2 / (CT2+CP2)≤-68.8.

[0011] Furthermore, the spacer group also includes a second spacer element located between the second lens and the third lens and in at least partial contact with the image side of the second lens, and a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens. The effective focal length f3 of the third lens and the spacing EP23 between the second spacer element and the third spacer element along the optical axis of the optical imaging lens satisfy the following: -44.2≤f3 / EP23≤-27.5.

[0012] Furthermore, the spacer group also includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens. The radius of curvature R6 of the image side of the third lens and the inner diameter d3s of the object side of the third spacer element satisfy the following: 1.69≤R6 / d3s≤4.31.

[0013] Furthermore, the spacer group also includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens. The outer diameter D3m of the image side of the third spacer element and the radius of curvature R7 of the object side of the fourth lens satisfy the following condition: 2.84≤R7 / D3m≤4.92.

[0014] Furthermore, the spacer group also includes a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side of the fourth lens. The radius of curvature R8 of the image side of the fourth lens and the outer diameter D4s of the object side of the fourth spacer element satisfy the following: -2.1≤R8 / D4s≤-0.71.

[0015] Furthermore, the spacer group also includes a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image side of the fifth lens. The outer diameter D5m of the image side of the fifth spacer element, the inner diameter d5m of the image side of the fifth spacer element, and the radius of curvature R11 of the object side of the sixth lens satisfy the following: 1.54≤(D5m-d5m) / R11≤1.76.

[0016] Furthermore, the spacer group also includes a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image side of the fifth lens. The air gap T56 between the fifth lens and the sixth lens on the optical axis of the optical imaging lens and the gap EP56 between the fifth spacer element and the sixth spacer element along the optical axis satisfy the following: 2.57≤EP56 / T56≤4.92.

[0017] Furthermore, the first lens has positive optical power, its object-side surface is convex, and its image-side surface is concave; the second lens has negative optical power, its object-side surface is convex, and its image-side surface is concave; the third lens has negative optical power, and its image-side surface is concave; the fourth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; the fifth lens has negative optical power, and its image-side surface is concave; the sixth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; and the seventh lens has negative optical power, its object-side surface is convex, and its image-side surface is concave.

[0018] Applying the technical solution of this utility model, the optical imaging lens has seven lenses with optical power. The optical imaging lens includes a lens group, a spacer element group, and a lens barrel. The lens group from the object side to the image side of the optical imaging lens includes a first lens to a seventh lens arranged in sequence at intervals. The spacer element group includes at least a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image side of the sixth lens. The lens group and the spacer element group are housed in the lens barrel. The radius of curvature R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacer element satisfy the following: -2.72≤R12 / D6s≤-1.15. The radius of curvature R13 of the object side of the seventh lens, the outer diameter D6m of the image side of the sixth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy the following: 10.25≤R13 / (D6m-d6m)≤11.08.

[0019] This application's optical imaging lens uses seven lenses with optical power, arranged sequentially from the first to the seventh lens at intervals. In this application's optical imaging lens, by limiting R12 / D6s within a reasonable range, the curvature of the image-side surface of the sixth lens can be controlled, while simultaneously constraining the outer diameter of the object-side surface of the sixth spacer element, improving the manufacturability of the sixth lens and the bearing stability of the rear end of the optical imaging lens. However, at this point, the smaller curvature of the image-side surface of the sixth lens results in a wider beam aperture emanating from the sixth lens and poorer constraint on edge rays, causing severe field curvature and strong stray light energy in the image. By limiting R13 / (D6m-d6m) within a reasonable range, the curvature of the object side of the seventh lens is constrained. The cooperation between the sixth and seventh lenses adjusts the optical path difference between the central and peripheral rays, which can adjust the field curvature and reduce aberrations. At the same time, the inner diameter of the sixth spacer element effectively blocks stray light from outside the field of view, ensuring clear imaging when light is transmitted from the sixth lens to the seventh lens. It also facilitates a smoother transition between the structural part and the effective diameter part of the seventh lens, improving the manufacturability of the seventh lens. Combined with the reasonable ring width of the sixth spacer element, the bearing stability of the sixth spacer element and the seventh lens is improved. Attached Figure Description

[0020] 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:

[0021] Figure 1 A schematic diagram showing partial parameters of an optical imaging lens according to any alternative embodiment of the present invention is provided.

[0022] Figure 2 A schematic diagram of the structure of the optical imaging lens according to Embodiment 1 of this utility model is shown;

[0023] Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiment 2 of this utility model is shown;

[0024] Figures 4 to 6 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Embodiment 1 are shown respectively.

[0025] Figure 7 A schematic diagram of the structure of the optical imaging lens of Embodiment 3 of this utility model is shown;

[0026] Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiment 4 of this utility model is shown;

[0027] Figures 9 to 11The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Embodiment 3 are shown respectively.

[0028] Figure 12 A schematic diagram of the structure of the optical imaging lens of Embodiment 5 of this utility model is shown;

[0029] Figure 13 A schematic diagram of the structure of the optical imaging lens of Embodiment Six of this utility model is shown;

[0030] Figures 14 to 16 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Embodiment 5 are shown respectively.

[0031] Figure 17 A schematic diagram of the structure of the optical imaging lens of Embodiment Seven of this utility model is shown;

[0032] Figure 18 A schematic diagram of the structure of the optical imaging lens of Embodiment 8 of this utility model is shown;

[0033] Figures 19 to 21 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Embodiment 7 are shown respectively.

[0034] Figures 22 to 23 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of R12 / D6s=2.58 and R13 / (D6m-d6m)=11.04 are shown respectively in an optional embodiment of the present invention.

[0035] Figures 24 to 25 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of R12 / D6s=2.58 and R13 / (D6m-d6m)=12 are shown respectively.

[0036] Figures 26 to 27 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of R12 / D6s=2.58 and R13 / (D6m-d6m)=10 are shown respectively.

[0037] The above figures include the following reference numerals:

[0038] E1, First lens; P1, First spacer element; E2, Second lens; P2, Second spacer element; E3, Third lens; P3, Third spacer element; E4, Fourth lens; P4, Fourth spacer element; P4b, Fourth auxiliary spacer element; E5, Fifth lens; P5, Fifth spacer element; E6, Sixth lens; P6, Sixth spacer element; P6b, Sixth auxiliary spacer element; E7, Seventh lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; S6, Object-side surface of the third lens; S7, Image-side surface of the third lens; S8, Object-side surface of the fourth lens; S9, Image-side surface of the fourth lens; S10, Object-side surface of the fifth lens; S11, Image-side surface of the fifth lens; S12, Object-side surface of the sixth lens; S13, Image-side surface of the sixth lens; S14, Object-side surface of the seventh lens; S15, Image-side surface of the seventh lens. Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that 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 that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, 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 convexity or concavity. For the eye-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the display-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0045] To address the problem of severe aberrations at the rear end of existing optical imaging lenses, this invention provides an optical imaging lens.

[0046] First Implementation Method

[0047] like Figures 1 to 23 As shown, the optical imaging lens has seven lenses with optical power. The optical imaging lens includes a lens group, a spacer element group, and a lens barrel. The lens group from the object side to the image side of the optical imaging lens includes a first lens to a seventh lens arranged in sequence at intervals. The spacer element group includes at least a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image side of the sixth lens. The lens group and the spacer element group are housed in the lens barrel. The radius of curvature R12 of the image side of the sixth lens and the outer diameter D6s of the object side of the sixth spacer element satisfy the following: -2.72≤R12 / D6s≤-1.15. The radius of curvature R13 of the object side of the seventh lens, the outer diameter D6m of the image side of the sixth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy the following: 10.25≤R13 / (D6m-d6m)≤11.08.

[0048] This application's optical imaging lens uses seven lenses with optical power, arranged sequentially from the first to the seventh lens at intervals. In this application's optical imaging lens, by limiting R12 / D6s within a reasonable range, the curvature of the image-side surface of the sixth lens can be controlled, while simultaneously constraining the outer diameter of the object-side surface of the sixth spacer element, improving the manufacturability of the sixth lens and the bearing stability of the rear end of the optical imaging lens. However, at this point, the smaller curvature of the image-side surface of the sixth lens results in a wider beam aperture emanating from the sixth lens and poorer constraint on edge rays, causing severe field curvature and strong stray light energy in the image. By limiting R13 / (D6m-d6m) within a reasonable range, the curvature of the object side of the seventh lens is constrained. The cooperation between the sixth and seventh lenses adjusts the optical path difference between the central and peripheral rays, which can adjust the field curvature and reduce aberrations. At the same time, the inner diameter of the sixth spacer element effectively blocks stray light from outside the field of view, ensuring clear imaging when light is transmitted from the sixth lens to the seventh lens. It also facilitates a smoother transition between the structural part and the effective diameter part of the seventh lens, improving the manufacturability of the seventh lens. Combined with the reasonable ring width of the sixth spacer element, the bearing stability of the sixth spacer element and the seventh lens is improved.

[0049] Table 1 below shows the stray light distribution of the optical imaging lenses of Option 1 of this application and Options 2 and 3 in the prior art under the condition of R12 / D6s = 2.58, with different values ​​of R13 / (D6m-d6m). In the stray light energy intensity distribution diagram, the X and Y axes represent the spatial position of the imaging surface, showing the peak position of the energy distribution of stray light on the imaging surface. The color intensity represents the strength of stray light energy, that is, the luminous flux of stray light per square millimeter on the imaging surface (unit: FLUX / sq-MM).

[0050] Table 1

[0051] Scheme Number 1 2 3 R12 / D6s 2.58 2.58 2.58 R13 / (D6m-d6m) 11.04 12 10 stray light path diagram Appendix Figure 22 Appendix Figure 24 Appendix Figure 26 stray light energy intensity distribution map Appendix Figure 23 Appendix Figure 25 Appendix Figure 27

[0052] Optical imaging lenses as shown in Scheme 2 and Scheme 3 are existing technologies. In Scheme 2, when R12 / D6s = 2.58 and R13 / (D6m-d6m) = 12, the light distribution is as follows: Figure 24 and Figure 25 As shown, when R13 / (D6m-d6m) is too large, the highest energy intensity of stray light on the imaging plane of the optical imaging lens can reach 9.69e-6 (FLUX / sq-MM), which results in high stray light energy and low image sharpness. In Scheme 3, with R12 / D6s = 2.58 and R13 / (D6m-d6m) = 10, the light distribution is as follows... Figure 26 and Figure 27As shown, when R13 / (D6m-d6m) is too small, the highest energy intensity of stray light on the imaging surface of the optical imaging lens is as high as 1.19e-5 (FLUX / sq-MM), which seriously affects the imaging quality.

[0053] The optical imaging lens shown in Scheme 1 is an embodiment of this application. In Scheme 1, when R12 / D6s = 2.58 and R13 / (D6m-d6m) = 11.04, the stray light distribution is as follows: Figure 22 and Figure 23 As shown, the optical imaging lens of this application produces clear images, reduces aberrations, and significantly lowers stray light energy.

[0054] In this embodiment, the spacer element group further includes a third spacer element located between the third and fourth lenses and in at least partial contact with the image-side surface of the third lens, and a fourth spacer element located between the fourth and fifth lenses and in at least partial contact with the image-side surface of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 between the third and fourth spacer elements along the optical axis of the optical imaging lens satisfy the following: 11.97 ≤ f4 / EP34 ≤ 36.67. If the value of f4 / EP34 is too large, the effective focal length of the fourth lens will be too long relative to the distance between the third and fourth spacer elements, causing unnecessary refraction of light during transmission from the third lens to the fourth lens, introducing aberrations, and thus affecting the sharpness and contrast of the image. If the value of f4 / EP34 is too small, under the condition that the effective focal length of the fourth lens is too short or the distance between the third and fourth spacer elements along the optical axis of the optical imaging lens is too large, the light focusing ability of the lens group will be weakened, affecting the brightness and detail of the image, while increasing the physical size of the lens group, which is not conducive to the miniaturization of the optical imaging lens. By limiting the f4 / EP34 ratio within a reasonable range, the physical dimensions and optical performance of the imaging lens can be balanced, avoiding aberration problems caused by improper settings of the focal length of the fourth lens and the spacing of the spacers before and after the fourth lens. Properly controlling the f4 / EP34 ratio significantly enhances the stability of the imaging lens and reduces the impact of temperature changes or vibrations on image quality.

[0055] In this embodiment, the spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image-side surface of the third lens. The air gap T34 between the third and fourth lenses on the optical axis of the optical imaging lens and the maximum thickness CP3 of the third spacer element satisfy the following condition: 2.54 ≤ T34 / CP3 ≤ 4.63. If the value of T34 / CP3 is too large, the air gap between the third and fourth lenses on the optical axis of the optical imaging lens will be much larger than the maximum thickness of the third spacer element, which may lead to insufficient strength of the third spacer element, making it prone to deformation during assembly, affecting the precise spacing between the third and fourth lenses, and thus reducing image quality. If the value of T34 / CP3 is too small, the thickness of the third spacer element will be too large, increasing the overall thickness of the lens group, which is not conducive to the miniaturization and thinning design of the optical imaging lens, and will also increase useless light refraction, reducing image sharpness. By limiting T34 / CP3 within a reasonable range, the strength of the third spacer element can be ensured, and deformation caused by excessive pressure during assembly can be avoided. Meanwhile, by adjusting the thickness of the third spacer element, the field curvature can be adjusted, the resolution can be improved, and the imaging quality of the optical imaging lens can be enhanced.

[0056] In this embodiment, the spacer element group further includes a first spacer element located between the first lens and the second lens and in at least partial contact with the image-side surface of the first lens. The effective focal length f1 of the first lens, the distance EP01 between the object-side end face of the lens barrel and the first spacer element along the optical axis of the optical imaging lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 3.08 ≤ f1 / (EP01+CT1) ≤ 3.7. If the value of f1 / (EP01+CT1) is too large, it will reduce the field curvature sensitivity of the first lens. However, since an excessively large effective focal length of the first lens can easily lead to an increase in the refraction angle of edge rays, it will increase the aberration of the optical imaging lens. If the value of f1 / (EP01+CT1) is too small, the effective focal length of the first lens will be too small, resulting in an excessively small refraction angle of light on the first lens, affecting the focusing effect of light, increasing field curvature, and similarly reducing image quality. By limiting f1 / (EP01+CT1) to a reasonable range, the field curvature sensitivity of the first lens can be effectively reduced, while the thickness of the first spacer element can be controlled, improving assembly stability, reducing stray light, and thus improving image quality.

[0057] In this embodiment, the spacer element group further includes a first spacer element located between the first lens and the second lens and in at least partial contact with the image-side surface of the first lens, and a second spacer element located between the second lens and the third lens and in at least partial contact with the image-side surface of the second lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the gap EP12 between the first spacer element and the second spacer element along the optical axis satisfy the following: 1.21 ≤ (T12 + T23) / EP12 ≤ 1.96. If the value of (T12 + T23) / EP12 is too large, it indicates that the total air gap between the first lens, the second lens, and the third lens is too large relative to the gap between the first spacer element and the second spacer element, resulting in insufficient edge thickness of the second lens, increasing light scattering at the edge of the second lens, and reducing image quality. If the value of (T12+T23) / EP12 is too small, and the total air gap between the first, second, and third lenses is too small relative to the gap between the first and second spacers, or if the air gap between the first and second lenses on the optical axis of the imaging lens is too large, the assembly accuracy of the lens group will decrease, and the assembly difficulty will increase. Simultaneously, an excessively small air gap between the front lenses will cause the light propagation space between the lenses to be too compact, introducing more aberrations and stray light, affecting image sharpness. By limiting (T12+T23) / EP12 to a reasonable range, the edge thickness of the second lens can be constrained by limiting the distance between the first and second spacers, and the center thickness of the second lens can be constrained by the on-axis air gap between the first, second, and third lenses. This effectively constrains the edge-to-thickness ratio of the second lens, ensuring that the edge thickness of the second lens is conducive to improving the forming stability of the second lens. At the same time, by reasonably controlling the air gap between the front lenses, assembly stability and smooth light transmission between the lenses are improved, stray light is reduced, and thus image quality is enhanced.

[0058] In this embodiment, the spacer element group further includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image-side surface of the second lens. The effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy the following condition: -104.78 ≤ f2 / (CT2+CP2) ≤ -68.8. If the value of f2 / (CT2+CP2) is too large, the effective focal length of the second lens is much smaller than the sum of the center thickness of the second lens and the maximum thickness of the second spacer element, resulting in a weakened contribution of the second lens to the optical imaging lens, reducing the focusing ability of the optical imaging lens, and increasing the light refraction angle, introducing more aberrations. If the value of f2 / (CT2+CP2) is too small, it will result in an excessively long effective focal length of the second lens, increasing the light refraction angle between the second lens and the third lens, or the sum of the center thickness of the second lens and the maximum thickness of the second spacer element will be too small, resulting in unclear imaging. By limiting f2 / (CT2+CP2) within a reasonable range, the refraction angle of light between the second and third lenses can be set appropriately, avoiding problems such as unclear imaging and increased aberrations, thus improving imaging quality. The layout of the central lens and spacer elements of the optical imaging lens is also reasonably allocated, ensuring the stability of the assembly of the second and third lenses.

[0059] In this embodiment, the spacer element group further includes a second spacer element located between the second and third lenses and in at least partial contact with the image-side surface of the second lens, and a third spacer element located between the third and fourth lenses and in at least partial contact with the image-side surface of the third lens. The effective focal length f3 of the third lens and the spacing EP23 between the second and third spacers along the optical axis of the optical imaging lens satisfy the following condition: -44.2 ≤ f3 / EP23 ≤ -27.5. If the value of f3 / EP23 is too large, the effective focal length of the third lens is too short, causing the light to focus too early, affecting the image quality and increasing aberrations. If the value of f3 / EP23 is too small, the effective focal length of the third lens is too long, increasing the refraction angle of light from the third lens to the fourth lens, thereby increasing aberrations and stray light. By limiting f3 / EP23 within a reasonable range, the physical size and optical performance of the optical imaging lens can be balanced, avoiding aberration problems caused by an excessively long effective focal length of the third lens or an excessively small spacing between the second and third spacers, enhancing the stability of the optical imaging lens, and reducing the impact of temperature changes or vibrations on image quality.

[0060] In this embodiment, the spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image-side surface of the third lens. The radius of curvature R6 of the image-side surface of the third lens and the inner diameter d3s of the object-side surface of the third spacer element satisfy the following relationship: 1.69 ≤ R6 / d3s ≤ 4.31. If the value of R6 / d3s is too large, it will result in an excessively large light angle in the third lens, increasing the sensitivity of the optical imaging lens and reducing image quality. If the value of R6 / d3s is too small, it will result in an excessively small light angle in the third lens, reducing the light utilization efficiency of the optical imaging lens and generating more invalid light, thus reducing image quality. By limiting R6 / d3s to a reasonable range, the radius of curvature of the image-side surface of the third lens can be controlled to be appropriate, keeping the light angle within a reasonable range and reducing the sensitivity of the optical imaging lens. At the same time, by constraining the inner diameter of the object-side surface of the third spacer element by R6 / d3s, invalid light reflected from the third lens can be effectively blocked, reducing the risk of stray light generation and improving image quality.

[0061] In this embodiment, the spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image-side surface of the third lens. The outer diameter D3m of the image-side surface of the third spacer element and the radius of curvature R7 of the object-side surface of the fourth lens satisfy the following condition: 2.84 ≤ R7 / D3m ≤ 4.92. If the value of R7 / D3m is too large, it will result in an excessively large light angle at the fourth lens, reducing the stability of the optical imaging lens and increasing aberrations. If the value of R7 / D3m is too small, it will result in improper light focusing, increasing field curvature and aberrations. At the same time, due to the excessively small outer diameter design, it will affect the assembly stability. By limiting R7 / D3m to a reasonable range, the radius of curvature of the object-side surface of the fourth lens can be controlled, thereby keeping the light angle within a reasonable range and enhancing the stability of the optical imaging lens. Simultaneously, by constraining the outer diameter of the image-side surface of the third spacer element through the range of R7 / D3m, assembly stability is ensured and imaging quality is improved.

[0062] In this embodiment, the spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image-side surface of the fourth lens. The radius of curvature R8 of the image-side surface of the fourth lens and the outer diameter D4s of the object-side surface of the fourth spacer element satisfy the following relationship: -2.1 ≤ R8 / D4s ≤ -0.71. If the value of R8 / D4s is too large, it will cause large aberrations during the transmission of light between the fourth and fifth lenses, increasing stray light and affecting image sharpness. If the value of R8 / D4s is too small, it will cause the light angle to be too small, affecting the focusing effect of light, increasing field curvature, and thus affecting image quality. By limiting R8 / D4s to a reasonable range, the radius of curvature of the image-side surface of the fourth lens can be controlled, thereby keeping the light angle within a reasonable range. At the same time, by constraining the outer diameter of the object-side surface of the fourth spacer element by the range of R8 / D4s, assembly stability can be ensured and image quality improved.

[0063] In this embodiment, the spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image-side surface of the fifth lens. The outer diameter D5m of the image-side surface of the fifth spacer element, the inner diameter d5m of the image-side surface of the fifth spacer element, and the radius of curvature R11 of the object-side surface of the sixth lens satisfy the following: 1.54 ≤ (D5m - d5m) / R11 ≤ 1.76. If the value of (D5m - d5m) / R11 is too large, the radius of curvature of the object-side surface of the sixth lens will be too small, which will increase the field curvature of the optical imaging lens. An unreasonable design of the inner and outer diameters of the image-side surface of the fifth spacer element can easily lead to an increase in stray light, affecting the image sharpness. If the value of (D5m - d5m) / R11 is too small, the radius of curvature of the object-side surface of the sixth lens will be too large, resulting in improper light focusing and increased aberrations. At the same time, if the thickness of the fifth spacer element is too small, the structural strength will be greatly weakened, reducing the assembly stability. By limiting (D5m-d5m) / R11 within a reasonable range, the curvature of the object side of the sixth lens can be constrained, while the difference between the inner and outer diameters of the image side of the fifth spacer element can be constrained. This adjusts the field curvature, reduces aberrations, effectively blocks stray light outside the field of view, ensures clear imaging when light is transmitted from the fifth lens to the sixth lens, and guarantees assembly stability.

[0064] In this embodiment, the spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image-side surface of the fifth lens. The air gap T56 between the fifth and sixth lenses on the optical axis of the optical imaging lens and the gap EP56 between the fifth and sixth spacer elements along the optical axis satisfy the following: 2.57 ≤ EP56 / T56 ≤ 4.92. If the value of EP56 / T56 is too large, the gap between the fifth and sixth spacer elements is too large relative to the air gap between the fifth and sixth lenses on the optical axis, resulting in insufficient edge thickness of the sixth lens, affecting the forming stability and optical performance of the sixth lens. If the value of EP56 / T56 is too small, the gap between the fifth and sixth spacer elements is too small relative to the air gap between the fifth and sixth lenses on the optical axis, reducing the light transmission efficiency between the lenses, increasing stray light, and at the same time, the small air gap will lead to assembly difficulties, increase the risk of unnecessary contact between the fifth and sixth lenses, and affect the reliability of the optical imaging lens. By limiting EP56 / T56 within a reasonable range, the thickness ratio of the sixth lens can be effectively constrained, ensuring that the edge thickness of the sixth lens is conducive to the stability of the sixth lens forming, thereby improving the structural stability and imaging quality of the optical imaging lens, while ensuring assembly stability.

[0065] In this embodiment, the first lens has positive optical power, its object-side surface is convex, and its image-side surface is concave. The second lens has negative optical power, its object-side surface is convex, and its image-side surface is concave. The third lens has negative optical power, and its image-side surface is concave. The fourth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex. The fifth lens has negative optical power, and its image-side surface is concave. The sixth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex. The seventh lens has negative optical power, its object-side surface is convex, and its image-side surface is concave.

[0066] The optical imaging lens's power and surface shape optimize light path, ensuring a smooth transition of light and achieving efficient focusing and appropriate divergence. Specifically, the first lens has a positive power and a convex-concave surface. Its convex object-side surface collects light, while its concave image-side surface helps control initial light convergence, facilitating light management in subsequent lens groups. The second lens has a negative power and also a convex-concave surface. Its convex object-side surface further converges light, while its concave image-side surface promotes light divergence. The third lens maintains negative power, and its concave image-side surface further diverges light, balancing the focusing effects of the first and second lenses and reducing aberrations. The fourth lens has a positive power, with both its object-side and image-side surfaces being convex. This significantly enhances focusing ability, re-converging divergent light and ensuring optimal focusing when passing through the intermediate lens section. The fifth lens has negative optical power. The image side of the fifth lens is concave, which can appropriately diverge the light to balance the strong focusing effect of the fourth lens and prevent the light from being too concentrated, which could cause overheating or damage.

[0067] Meanwhile, the sixth lens has positive optical power, and both its object-side and image-side surfaces are convex, further enhancing light focusing and preparing for the final focusing stage in the imaging process. This concentrates the light, improving image sharpness and clarity. Finally, the seventh lens, with its negative optical power and concave-convex shape, serves as the terminal lens of the optical imaging lens, ensuring that light rays converge smoothly onto the image plane after passing through the front lens group, achieving clear, low-distortion image output. The entire lens group ensures a smooth transition of light rays from the front to the back, maintaining good focus and divergence balance even after multiple refractions. This optical imaging lens not only considers the natural trajectory of light but also balances structural compactness and optical performance, achieving large aperture, wide field of view, and high-resolution imaging effects while effectively controlling aberrations and stray light, thus improving image sharpness and stability.

[0068] Optionally, the optical imaging lens in the embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. Alternatively, the optical imaging lens can be simulated using CODEV software. During the simulation process using software and / or tools as described above, the surface profile of each lens can be appropriately adjusted based on the surface profile of the software and / or tools used.

[0069] In this embodiment, each lens can be optionally configured as a tangent lens. The outer diameter surface of the tangent lens has a tangent structure and a non-tangent structure, with the outer diameter of the tangent structure being smaller than the outer diameter of the non-tangent structure. The outer diameter of the tangent lens typically refers to the outer diameter of the non-tangent structure.

[0070] In this embodiment, each spacer element can be optionally configured as a truncated spacer element. The outer ring surface of the truncated spacer element has a truncated portion and a non-truncated portion, with the outer diameter of the truncated portion being smaller than the outer diameter of the non-truncated portion. The outer diameter of the truncated spacer element typically refers to the maximum outer diameter of the non-truncated portion.

[0071] Second Implementation Method

[0072] like Figures 1 to 23 As shown, the optical imaging lens has seven lenses with optical power. The optical imaging lens includes a lens group, a spacer element group, and a lens barrel. The lens group, from the object side to the image side of the optical imaging lens, includes a first lens to a seventh lens arranged sequentially at intervals. The spacer element group includes at least a sixth spacer element located between the sixth and seventh lenses and at least partially in contact with the image-side surface of the sixth lens. The lens group and the spacer element group are housed within the lens barrel. The spacer element group also includes a first spacer element located between the first and second lenses and at least partially in contact with the image-side surface of the first lens, and a second spacer element located between the second and third lenses and at least partially in contact with the image-side surface of the second lens. The first lens... The air gap T12 between the second and third lenses on the optical axis of the optical imaging lens, the air gap T23 between the second and third lenses on the optical axis, and the gap EP12 between the first and second spacer elements along the optical axis satisfy the following: 1.21≤(T12+T23) / EP12≤1.96; the spacer element group also includes a second spacer element located between the second and third lenses and in at least partial contact with the image side of the second lens, and the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy the following: -104.78≤f2 / (CT2+CP2)≤-68.8.

[0073] This application's optical imaging lens uses seven lenses with optical power, arranged sequentially from the first to the seventh lens at intervals. In this optical imaging lens, by limiting (T12+T23) / EP12 within a reasonable range, and by constraining the distance between the first and second spacer elements, the edge thickness of the second lens can be constrained. The center thickness of the second lens can be constrained by the on-axis air gap between the first, second, and third lenses, thereby effectively constraining the edge-to-thickness ratio of the second lens. Ensuring the edge thickness of the second lens is beneficial to improving its forming stability. Simultaneously, by reasonably controlling the air gap between the front lenses, assembly stability and smooth light transmission between lenses are improved, stray light is reduced, and thus image quality is enhanced. However, under the condition of ensuring the structural stability of the optical imaging lens, improper setting of the second lens's radius of curvature and center thickness results in poor light control by the second lens, leading to problems such as unclear final imaging and increased aberrations, indicating poor aberration control. By limiting f2 / (CT2+CP2) within a reasonable range, setting the refraction angle of light between the second and third lenses, and rationally allocating the layout of the central lens and spacer elements of the optical imaging lens, the stability of the assembly of the second and third lenses is ensured.

[0074] It should be noted that this embodiment also includes other conditional expressions from the above embodiments, which will not be elaborated here.

[0075] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0076] The optical imaging lens in this application may employ multiple lenses, such as the seven 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.

[0077] 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 seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0078] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1The parameters d3s, D4s, EP34, etc., are indicated to clearly and intuitively explain 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.

[0079] 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.

[0080] It should be noted that any one of the examples in Embodiments 1 to 8 described below is applicable to all embodiments of this application.

[0081] Example 1

[0082] like Figure 2 As shown, an optical imaging lens according to Embodiment 1 of this application is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1 is shown.

[0083] like Figure 2 As shown, the optical imaging lens, from the object side to the image side, includes, in sequence: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a sixth lens E6, a sixth spacer element P6, a sixth auxiliary spacer element P6b, and a seventh lens E7. The sixth auxiliary spacer element P6b is located on the image side of the sixth spacer element and is at least partially in contact with the image side surface of the sixth spacer element.

[0084] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has negative optical power, its object-side surface S6 is convex, and its image-side surface S7 is concave. The fourth lens E4 has positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens E5 has negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The sixth lens E6 has positive optical power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The seventh lens E7 has negative optical power, its object-side surface S14 is convex, and its image-side surface S15 is concave. The optical imaging lens also has a light-blocking aperture and a filter (not shown in the attached diagram), where S5 represents the light-blocking aperture, and the filter has an object-side surface S16 and an image-side surface S17. Light rays from the object pass through S1 to S17 of the optical imaging lens to reach the imaging plane IMG.

[0085] Table 2 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature, thickness / distance, effective radius, and focal length are all millimeters (mm).

[0086] Table 2

[0087]

[0088]

[0089] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0090]

[0091] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; 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 2 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 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 in Example 1.

[0092] Table 3 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side surface and image-side surface of the first to seventh lenses are both aspherical.

[0093] Table 3

[0094]

[0095]

[0096] Figure 4 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical 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.

[0097] according to Figures 4 to 6 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0098] Example 2

[0099] like Figure 3 The image shows an optical imaging lens according to Embodiment 2 of this application. The difference between this lens and Embodiment 1 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0100] Figure 3 A schematic diagram of the optical imaging lens of Embodiment 2 is shown. For simplicity, descriptions similar to those in Embodiment 1 are omitted. In this embodiment, a fourth auxiliary spacer element P4b is further provided between the fourth lens and the fifth lens. The fourth auxiliary spacer element is located on the image side of the fourth spacer element and is at least partially in contact with the image side side of the fourth spacer element. This arrangement allows the large step difference between the fourth lens and the fifth lens to be stably supported by the two spacer elements, reducing the molding difficulty of the fourth lens structure, improving assembly stability, and also contributing to a more compact optical imaging lens structure, achieving miniaturization.

[0101] Example 3

[0102] like Figure 7 As shown, an optical imaging lens according to Embodiment 3 of this application is described. Figure 7 A schematic diagram of the optical imaging lens of Embodiment 3 is shown.

[0103] like Figure 7 As shown, the optical imaging lens includes, in sequence from the object side to the image side: first lens E1, first spacer element P1, second lens E2, second spacer element P2, third lens E3, third spacer element P3, fourth lens E4, fourth spacer element P4, fifth lens E5, fifth spacer element P5, sixth lens E6, sixth spacer element P6, sixth auxiliary spacer element P6b, and seventh lens E7.

[0104] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has negative optical power, its object-side surface S6 is convex, and its image-side surface S7 is concave. The fourth lens E4 has positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens E5 has negative optical power, its object-side surface S10 is concave, and its image-side surface S11 is concave. The sixth lens E6 has positive optical power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The seventh lens E7 has negative optical power, its object-side surface S14 is convex, and its image-side surface S15 is concave. The optical imaging lens also has a light-blocking aperture and a filter (not shown in the attached diagram), where S5 represents the light-blocking aperture, and the filter has an object-side surface S16 and an image-side surface S17. Light rays from the object pass through S1 to S17 of the optical imaging lens to reach the imaging plane IMG.

[0105] Table 4 shows the basic structural parameters of the optical imaging lens of Embodiment 3, where the units for radius of curvature, thickness / distance, effective radius and focal length are all millimeters (mm).

[0106] Table 4

[0107] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.2300 S1 aspherical 3.1052 1.0287 1.55 55.9 0.1734 S2 aspherical 13.5409 0.2830 -0.1130 S3 aspherical 21.3493 0.3101 1.68 19.2 31.5065 S4 aspherical 8.9166 0.3538 14.0582 S5 spherical endless 0.3393 S6 aspherical -70.0000 0.4637 1.68 19.2 74.9920 S7 aspherical 17.6652 0.0558 2.5790 S8 aspherical 29.5169 0.7976 1.55 55.9 -3.9903 S9 aspherical -7.1769 0.6828 -1.3090 S10 aspherical -70.0000 0.4394 1.57 37.4 -80.0000 S11 aspherical 4.5921 0.1791 0.086 S12 aspherical 2.6001 0.9090 1.55 55.9 -1.0477 S13 aspherical -22.6075 1.0587 -78.6471 S14 aspherical 8.9727 0.4411 1.54 55.7 0.2788 S15 aspherical 2.0313 0.6445 -1.0000 S16 spherical endless 0.2100 S17 spherical endless 0.3761 IMG spherical endless

[0108] Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side surface and image-side surface of the first to seventh lenses are both aspherical.

[0109] Table 5

[0110]

[0111]

[0112] Figure 9 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 optical imaging lens. Figure 10 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 11 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.

[0113] according to Figures 9 to 11It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0114] Example 4

[0115] like Figure 8 As shown, an optical imaging lens according to Embodiment 4 of this application is described. The difference between this lens and Embodiment 3 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0116] Figure 8 A schematic diagram of the optical imaging lens of Embodiment 4 is shown. For simplicity, descriptions similar to those in Embodiment 3 are omitted. In this embodiment, a fourth auxiliary spacer element P4b is also provided between the fourth lens and the fifth lens. This arrangement allows the large step difference between the fourth and fifth lenses to be stably supported by the two spacer elements, reducing the molding difficulty of the fourth lens structure, improving assembly stability, and also contributing to a more compact optical imaging lens structure, achieving miniaturization.

[0117] Example 5

[0118] like Figure 12 As shown, an optical imaging lens according to Embodiment 5 of this application is described. Figure 12 A schematic diagram of the optical imaging lens of Embodiment 5 is shown.

[0119] like Figure 12 As shown, the optical imaging lens includes, in sequence from the object side to the image side: first lens E1, first spacer element P1, second lens E2, second spacer element P2, third lens E3, third spacer element P3, fourth lens E4, fourth spacer element P4, fifth lens E5, fifth spacer element P5, sixth lens E6, sixth spacer element P6, sixth auxiliary spacer element P6b, and seventh lens E7.

[0120] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has negative optical power, its object-side surface S6 is convex, and its image-side surface S7 is concave. The fourth lens E4 has positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens E5 has negative optical power, its object-side surface S10 is concave, and its image-side surface S11 is concave. The sixth lens E6 has positive optical power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The seventh lens E7 has negative optical power, its object-side surface S14 is convex, and its image-side surface S15 is concave. The optical imaging lens also has a light-blocking aperture and a filter (not shown in the attached diagram), where S5 represents the light-blocking aperture, and the filter has an object-side surface S16 and an image-side surface S17. Light rays from the object pass through S1 to S17 of the optical imaging lens to reach the imaging plane IMG.

[0121] Table 6 shows the basic structural parameters of the optical imaging lens of Embodiment 5, where the units for radius of curvature, thickness / distance, effective radius, and focal length are all millimeters (mm).

[0122] Table 6

[0123] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.2300 S1 aspherical 3.1258 1.0287 1.55 55.9 0.1734 S2 aspherical 12.6082 02830 -0.1130 S3 aspherical 21.4584 0.3101 1.68 19.2 31.5065 S4 aspherical 9.6893 0.3538 14.0582 S5 spherical endless 0.3393 S6 aspherical -69.9994 0.4637 1.68 19.2 74.9920 S7 aspherical 15.0201 0.0558 2.5790 S8 aspherical 21.9636 0.7976 1.55 55.9 -3.9903 S9 aspherical -10.4560 0.6828 -1.3090 S10 aspherical 17.8245 0.4394 1.57 37.4 -80.0000 S11 aspherical 4.1774 0.1791 0.0863 S12 aspherical 2.5543 0.9090 1.55 55.9 -1.0477 S13 aspherical -29.4832 1.0587 -78.6471 S14 aspherical 8.7193 0.4411 1.54 55.7 0.2788 S15 aspherical 2.0383 0.6445 -1.0000 S16 spherical endless 0.2100 S17 spherical endless 0.3761 IMG spherical endless

[0124] Table 7 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side surface and image-side surface of the first to seventh lenses are both aspherical.

[0125] Table 7

[0126]

[0127]

[0128] Figure 14 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 15 The astigmatism curve of the optical imaging lens of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16 The distortion curve of the optical imaging lens of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0129] according to Figures 9 to 11It can be seen that the optical imaging lens given in Example 5 can achieve good imaging quality.

[0130] Example 6

[0131] like Figure 13 As shown, an optical imaging lens according to Embodiment Six of this application is described. The difference between Embodiment Five and Embodiment Six is ​​that the distance and thickness between the various spacer elements, lenses, lens barrels, etc. are different.

[0132] Figure 13 A schematic diagram of the optical imaging lens of Embodiment Six is ​​shown. For simplicity, descriptions similar to those in Embodiment Five are omitted. In this embodiment, a fourth auxiliary spacer element P4b is also provided between the fourth lens and the fifth lens. This arrangement allows the large step difference between the fourth and fifth lenses to be stably supported by the two spacer elements, reducing the molding difficulty of the fourth lens structure, improving assembly stability, and also contributing to a more compact optical imaging lens structure, achieving miniaturization.

[0133] Example 7

[0134] like Figure 17 The image shows an optical imaging lens according to Embodiment Seven of this application. Figure 17 A schematic diagram of the optical imaging lens of Embodiment 7 is shown.

[0135] like Figure 17 As shown, the optical imaging lens includes, in sequence from the object side to the image side: first lens E1, first spacer element P1, second lens E2, second spacer element P2, third lens E3, third spacer element P3, fourth lens E4, fourth spacer element P4, fifth lens E5, fifth spacer element P5, sixth lens E6, sixth spacer element P6, sixth auxiliary spacer element P6b, and seventh lens E7.

[0136] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has negative optical power, its object-side surface S6 is convex, and its image-side surface S7 is concave. The fourth lens E4 has positive optical power, its object-side surface S8 is convex, and its image-side surface S9 is convex. The fifth lens E5 has negative optical power, its object-side surface S10 is convex, and its image-side surface S11 is concave. The sixth lens E6 has positive optical power, its object-side surface S12 is convex, and its image-side surface S13 is convex. The seventh lens E7 has negative optical power, its object-side surface S14 is convex, and its image-side surface S15 is concave. The optical imaging lens also has a light-blocking aperture and a filter (not shown in the attached diagram), where S5 represents the light-blocking aperture, and the filter has an object-side surface S16 and an image-side surface S17. Light rays from the object pass through S1 to S17 of the optical imaging lens to reach the imaging plane IMG.

[0137] Table 8 shows the basic structural parameters of the optical imaging lens of Embodiment 7, wherein the units of radius of curvature, thickness / distance, effective radius and focal length are all millimeters (mm).

[0138] Table 8

[0139] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.2300 S1 aspherical 3.1713 0.8662 1.55 55.9 0.0264 S2 aspherical 10.6565 0.3966 1.1039 S3 aspherical 16.0227 0.3075 1.68 19.2 15.4565 S4 aspherical 8.1200 0.2259 -0.2383 S5 spherical endless 0.1944 S6 aspherical 13.3893 0.3639 1.68 19.2 0.2559 S7 aspherical 7.5563 0.1018 -0.1439 S8 aspherical 19.4782 0.8973 1.55 55.9 1.9476 S9 aspherical -8.9113 0.6370 1.1650 S10 aspherical -79.9999 0.5122 1.57 37.4 -80.0000 S11 aspherical 4.6683 0.2179 0.1809 S12 aspherical 2.6465 0.9020 1.55 55.9 -0.9805 S13 aspherical -12.4415 1.0163 -53.4395 S14 aspherical 9.4288 0.4714 1.54 55.7 0.6881 S15 aspherical 2.0774 0.7506 -1.0081 S16 spherical endless 0.2100 S17 spherical endless 0.4859 IMG spherical endless

[0140] Table 9 shows the higher-order coefficients that can be used for each aspherical mirror in the embodiments, wherein the surface shape of each aspherical surface can be defined by formula (1) given in Embodiment 1 above. In this embodiment, the object-side and image-side surfaces of the first to seventh lenses are all aspherical.

[0141] Table 9

[0142]

[0143]

[0144] Figure 19 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 20 The astigmatism curve of the optical imaging lens of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 21 The distortion curve of the optical imaging lens of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles.

[0145] according to Figures 19 to 21It can be seen that the optical imaging lens given in Example 7 can achieve good imaging quality.

[0146] Example 8

[0147] like Figure 18 As shown, an optical imaging lens of Embodiment 8 of this application is described. The difference between this lens and Embodiment 7 is that the distances and thicknesses between the various spacer elements, lenses, lens barrels, etc., are different.

[0148] Figure 18 A schematic diagram of the optical imaging lens of Embodiment 8 is shown. For simplicity, descriptions similar to those in Embodiment 5 are omitted. In this embodiment, a fourth auxiliary spacer element P4b is also provided between the fourth lens and the fifth lens. This arrangement allows the large step difference between the fourth and fifth lenses to be stably supported by the two spacer elements, reducing the molding difficulty of the fourth lens structure, improving assembly stability, and also contributing to a more compact optical imaging lens structure, achieving miniaturization.

[0149] In summary, Embodiments 1 to 8 of the optical imaging lens respectively satisfy the relationships shown in Table 10.

[0150] Table 10

[0151] Conditional / Example 1 2 3 4 5 6 7 8 f4 / EP34 15.63 33.49 11.97 21.67 15.64 36.67 13.54 32.19 T34 / CP3 3.86 3.86 2.54 2.54 2.54 2.54 4.63 4.63 f1 / (EP01+CT1) 3.55 3.55 3.08 3.08 3.17 3.17 3.70 3.70 (T12+T23) / EP12 1.70 1.70 1.96 1.96 1.46 1.46 1.21 1.21 f2 / (CT2+CP2) -104.78 -104.78 -68.80 -68.80 -79.36 -79.36 -74.97 -74.97 f3 / EP23 -44.20 -44.20 -39.99 -39.99 -27.50 -27.50 -40.25 -40.25 R6 / d3s 1.69 1.69 4.31 4.31 3.58 3.58 1.76 1.76 R7 / D3m 2.84 2.93 4.47 4.92 3.33 3.54 2.95 2.95 R8 / D4s -1.38 -2.10 -0.71 -1.09 -1.04 -1.59 -0.89 -1.32 (D5m-d5m) / R11 1.57 1.57 1.76 1.76 1.71 1.71 1.54 1.54 R12 / D6s -2.58 -2.58 -2.09 -2.09 -2.72 -2.72 -1.15 -1.15 R13 / (D6m-d6m) 11.04 11.04 10.54 10.54 10.25 10.25 11.08 11.08 EP56 / T56 2.57 2.57 4.92 4.92 4.08 4.08 2.92 2.92

[0152] Table 11 shows the effective focal lengths f1 to f7 of each lens in the optical imaging lenses of Examples 1 to 8, in mm.

[0153] Table 11

[0154] Parameters / Examples 1 2 3 4 5 6 7 8 f 6.54 6.54 6.59 6.59 6.45 6.45 6.54 6.54 f1 8.38 8.38 7.14 7.14 7.34 7.34 7.95 7.95 f2 -34.79 -34.79 -22.85 -22.85 -26.36 -26.36 -24.71 -24.71 f3 -22.59 -22.59 -20.79 -20.79 -18.23 -18.23 -26.28 -26.28 f4 14.74 14.74 10.66 10.66 13.09 13.09 11.33 11.33 f5 -10.40 -10.40 -7.55 -7.55 -9.71 -9.71 -7.72 -7.72 f6 4.37 4.37 4.33 4.33 4.35 4.35 4.09 4.09 f7 -5.25 -5.25 -5.00 -5.00 -5.09 -5.09 -5.08 -5.08

[0155] Table 12 shows some structural parameters of the optical imaging lenses of Examples 1 to 8, in mm.

[0156] Table 12

[0157]

[0158]

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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, The optical imaging lens has seven lenses with optical power, and the optical imaging lens includes: The lens group, from the object side to the image side of the optical imaging lens, includes a first lens to a seventh lens arranged at intervals in sequence; A group of spacers, the group of spacers including at least a sixth spacer located between the sixth lens and the seventh lens and in at least partial contact with the image side surface of the sixth lens; The lens barrel, wherein the lens group and the spacer element group are housed within the lens barrel; Among them, the radius of curvature R12 of the image side of the sixth lens and the outer diameter of the object side of the sixth spacer element are... The following condition must be met between D6s: -2.72 ≤ R12 / D6s ≤ -1.15; The radius of curvature R13 of the object side of the seventh lens, the outer diameter D6m of the image side of the sixth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy the following condition: 10.25≤R13 / (D6m-d6m)≤11.

08.

2. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens and the spacing EP34 between the third spacer element and the fourth spacer element along the optical axis of the optical imaging lens satisfy the following: 11.97≤f4 / EP34≤36.

67.

3. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side of the third lens. The air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens and the maximum thickness CP3 of the third spacer element satisfy the following: 2.54≤T34 / CP3≤4.

63.

4. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element located between the first lens and the second lens and in at least partial contact with the image side of the first lens. The effective focal length f1 of the first lens, the distance EP01 between the object side end face of the lens barrel and the first spacer element along the optical axis of the optical imaging lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 3.08≤f1 / (EP01+CT1)≤3.

7.

5. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element located between the first lens and the second lens and in at least partial contact with the image side of the first lens, and a second spacer element located between the second lens and the third lens and in at least partial contact with the image side of the second lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the gap EP12 between the first spacer element and the second spacer element along the direction of the optical axis satisfy the following: 1.21≤(T12+T23) / EP12≤1.

96.

6. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element located between the second lens and the third lens and in at least partial contact with the image side of the second lens. The effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy the following: -104.78≤f2 / (CT2+CP2)≤-68.

8.

7. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a second spacer element located between the second lens and the third lens and in at least partial contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side surface of the third lens. The effective focal length f3 of the third lens and the distance EP23 between the second spacer element and the third spacer element along the optical axis of the optical imaging lens satisfy the following condition: -44.2≤f3 / EP23≤-27.

5.

8. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side surface of the third lens, wherein the radius of curvature R6 of the image side surface of the third lens and the inner diameter d3s of the object side surface of the third spacer element satisfy the following: 1.69≤R6 / d3s≤4.

31.

9. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a third spacer element located between the third lens and the fourth lens and in at least partial contact with the image side surface of the third lens. The outer diameter D3m of the image side surface of the third spacer element and the radius of curvature R7 of the object side surface of the fourth lens satisfy the following condition: 2.84≤R7 / D3m≤4.

92.

10. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and in at least partial contact with the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens and the outer diameter D4s of the object side surface of the fourth spacer element satisfy the following: -2.1≤R8 / D4s≤-0.

71.

11. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image-side surface of the fifth lens. The outer diameter D5m of the image-side surface of the fifth spacer element, the inner diameter d5m of the image-side surface of the fifth spacer element, and the radius of curvature R11 of the object-side surface of the sixth lens satisfy the following: 1.54≤(D5m-d5m) / R11≤1.

76.

12. The optical imaging lens according to claim 1, characterized in that, The spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and in at least partial contact with the image side of the fifth lens. The air gap T56 between the fifth lens and the sixth lens on the optical axis of the optical imaging lens and the gap EP56 between the fifth spacer element and the sixth spacer element along the optical axis satisfy the following: 2.57≤EP56 / T56≤4.

92.

13. The optical imaging lens according to claim 1, characterized in that, The first lens has positive optical power, the object side of the first lens is convex, and the image side of the first lens is concave. The sixth lens has positive optical power, the object side of the sixth lens is convex, and the image side of the sixth lens is convex. The seventh lens has negative optical power, the object side of the seventh lens is convex, and the image side of the seventh lens is concave.

14. The optical imaging lens according to claim 1, characterized in that, The second lens has negative optical power, the object side of the second lens is convex, and the image side of the second lens is concave. The third lens has negative optical power, and the image side of the third lens is concave. The fourth lens has positive optical power, the object side of the fourth lens is convex, and the image side of the fourth lens is convex. The fifth lens has negative optical power, and the image side of the fifth lens is concave.

Images