Optical imaging lens

Abstract

The application provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens set arranged in the lens barrel and a plurality of spacers, the lens set is composed of seven lenses, the seven lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side; and the following conditions are met: 5.63 <= EP01 / CT1 <= 7.25; and the following condition is met: 1.30 <= (D1s-d1s) / R2 <= 2.50. The application solves the problem that the seven-piece optical imaging lens in the prior art has an unreasonable front-end lens shape, which causes the lens to easily deform or even break due to stress concentration during assembly, thereby affecting the assembly stability of the optical imaging lens.

Description

Technical Field

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

[0002] In the current field of optical imaging technology, especially in the design of optical imaging lenses for smartphones and portable electronic devices, seven-element optical imaging lenses are favored by major manufacturers due to their high performance and excellent image quality. However, to meet various requirements, the design of seven-element optical imaging lenses faces numerous challenges.

[0003] Currently, to meet the requirement of compact structure, seven-element optical imaging lenses typically require constraints on the dimensions of the front-end structure of the lens barrel, the front-end lens, and the front-end spacer to compress the front-end size of the optical imaging lens and achieve a reasonable spatial layout. However, restricting the thickness of the object-side structure of the lens barrel, as well as the center and edge thickness of the first lens, can easily lead to unreasonable surface shape and design of the first lens. Consequently, during assembly, the first lens may experience excessive local stress, making it prone to deformation or even breakage, thus affecting the final assembly accuracy and stability of the optical imaging lens.

[0004] In other words, the existing seven-element optical imaging lens has the problem that the shape of the front lens is unreasonable, which makes the lens prone to deformation or even breakage due to stress concentration during the assembly process, thus affecting the assembly stability of the optical imaging lens. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging lens that solves the problem in existing seven-element optical imaging lenses where the shape of the front lens is unreasonable, causing the lens to deform or even break due to stress concentration during assembly, thus affecting the assembly stability of the optical imaging lens.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel. The lens group consists of seven lenses, which are sequentially arranged from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The plurality of spacers includes a first spacer disposed between the first lens and the second lens and in contact with the image side surface of the first lens. The distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer on the optical axis of the optical imaging lens satisfies the following relationship between the center thickness CT1 of the first lens on the optical axis: 5.63 ≤ EP01 / CT1 ≤ 7.25. The outer diameter D1s of the object side surface of the first spacer, the inner diameter d1s of the object side surface of the first spacer, and the radius of curvature R2 of the image side surface of the first lens satisfy the following relationship: 1.30 ≤ (D1s - d1s) / R2 ≤ 2.50.

[0007] According to another aspect of the present invention, an optical imaging lens is also provided, comprising a lens barrel and a lens group and a plurality of spacers disposed in the lens barrel. The lens group consists of seven lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The plurality of spacers includes a first spacer disposed between the first lens and the second lens and in contact with the image side of the first lens. The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer on the optical axis of the optical imaging lens satisfies the following condition: 5.63≤EP01 / CT1≤7.25. The air gap T12 between the first lens and the second lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the distance EP12 between the image side face of the first spacer and the object side face of the second spacer on the optical axis satisfy the following condition: 1.21≤(T12+CT2) / EP12≤1.64.

[0008] According to another aspect of the present invention, an optical imaging lens is also provided, comprising a lens barrel and a lens group and a plurality of spacers disposed in the lens barrel. The lens group consists of seven lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The plurality of spacers includes a first spacer disposed between the first lens and the second lens and in contact with the image side surface of the first lens. The distance EP01 between the object side end face of the lens barrel and the object side surface of the first spacer on the optical axis of the optical imaging lens satisfies the following relationship between the center thickness CT1 of the first lens on the optical axis and the following relationship between 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, and the inner diameter d1s of the object side surface of the first spacer satisfying the following relationship between the following relationship: -2.99 ≤ (R1 + R2) / d1s ≤ -0.85.

[0009] Furthermore, the center thickness CT2 of the second lens on the optical axis and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 3.93≤CT2 / CT1≤6.28.

[0010] Furthermore, the plurality of spacers also includes a second spacer placed between the second lens and the third lens and in 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, the center thickness CT2 of the second lens on the optical axis, and the distance EP12 between the image side of the first spacer and the object side of the second spacer on the optical axis satisfy the following: 1.21≤(T12+CT2) / EP12≤1.64.

[0011] Furthermore, the plurality of spacers also includes a second spacer placed between the second lens and the third lens and in contact with the image side of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side of the third lens. The spacing distance EP23 between the image side of the second spacer and the object side of the third spacer on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 1.15≤EP23 / (T23+T34)≤3.20.

[0012] Furthermore, the plurality of spacers also includes a fifth spacer placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, and a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens. The spacing distance EP56 between the image side of the fifth spacer and the object side of the sixth spacer on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy the following: 2.81≤EP56 / CT6≤3.53.

[0013] Furthermore, the plurality of spacers also includes a second spacer placed between the second lens and the third lens and in contact with the image side of the second lens, wherein the radius of curvature R5 of the object side of the third lens and the outer diameter D2m of the image side of the second spacer satisfy the following condition: 0.58≤R5 / D2m≤1.42.

[0014] Furthermore, the plurality of spacers also includes a third spacer placed between the third lens and the fourth lens and in contact with the image side of the third lens. The outer diameter D3s of the object side of the third spacer, the inner diameter d3s of the object side of the third spacer, and the radius of curvature R6 of the image side of the third lens satisfy the following: -2.48≤(D3s-d3s) / R6≤-1.26.

[0015] Furthermore, the plurality of spacers also includes a third spacer placed between the third lens and the fourth lens and in contact with the image side of the third lens, and a fourth spacer placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The inner diameter d3m of the image side of the third spacer, the inner diameter d4s of the object side of the fourth spacer, and the radius of curvature R7 of the object side of the fourth lens satisfy the following: 1.04≤(d3m+d4s) / R7≤1.72.

[0016] Furthermore, the plurality of spacers also includes a fourth spacer placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. The radius of curvature R9 of the object side of the fifth lens and the inner diameter d4m of the image side of the fourth spacer satisfy the following: -2.44≤R9 / d4m≤2.87.

[0017] Furthermore, the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R10 of the image side of the fifth lens satisfy the following condition: -4.45≤R11 / R10≤-2.47.

[0018] Furthermore, the plurality of spacers also includes a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens. The outer diameter D6s of the object side of the sixth spacer, the inner diameter d6s of the object side of the sixth spacer, and the radius of curvature R12 of the image side of the sixth lens satisfy the following: 1.85≤(D6s-d6s) / R12≤2.86.

[0019] Furthermore, the plurality of spacers also includes a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens. The radius of curvature R13 of the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer satisfy the following: 3.80≤R13 / d6m≤4.89.

[0020] Furthermore, the first lens has positive optical power, the object side of the first lens is concave, 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 concave; 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.

[0021] Furthermore, the second lens has positive 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, the object side of the third lens is convex, and the image side of the third lens is convex; the fourth lens has optical power, the object side of the fourth lens is convex; and the fifth lens has positive optical power, the image side of the fifth lens is convex.

[0022] Applying the technical solution of this invention, the optical imaging lens of this application comprises a lens barrel and seven lenses and multiple spacers disposed within the lens barrel. By reasonably arranging the positions of the seven lenses and the first spacer, and setting 5.63≤EP01 / CT1≤7.25, it can be seen that the center thickness of the first lens is thinner than the thickness of the edge portion of the first lens. This can easily lead to unreasonable surface shape and design of the first lens, and consequently, excessive local stress on the first lens during assembly, making it prone to deformation or even breakage, thus affecting the final assembly accuracy and stability of the optical imaging lens. Therefore, by constraining 1.30≤(D1s-d1s) / R2≤2.50, this application controls the ratio of the difference between the outer and inner diameters of the object side of the first spacer to the radius of curvature of the image side of the first lens. This helps to constrain the contact area between the first spacer and the first lens, thereby precisely controlling the fit between the first lens and the second lens. At the same time, it can effectively adjust the overall shape of the first lens, avoiding improper assembly and stress concentration during the assembly process due to the shape of the first lens and the first spacer, which could lead to deformation or breakage of the first lens. This ensures the assembly accuracy and stability between the lens barrel, the first lens, the first spacer, and the second lens, thereby improving the assembly stability of the optical imaging lens. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A dimensioned diagram of an optical imaging lens according to an alternative embodiment of the present invention is shown;

[0025] Figure 2 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of the present invention is shown;

[0026] Figure 3 The diagram shows a schematic representation of the optical imaging lens of Embodiments 1-2 of the present invention.

[0027] Figure 4 The diagram shows the structural schematics of the optical imaging lenses of embodiments 1-3 of the present invention;

[0028] Figures 5 to 7 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 of the present invention are shown respectively.

[0029] Figure 8 A schematic diagram of the optical imaging lens of Embodiment 2-1 of the present invention is shown;

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

[0031] Figure 10 The diagram shows the structural schematics of the optical imaging lenses of embodiments 2-3 of the present invention;

[0032] Figures 11 to 13 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 of the present invention are shown respectively.

[0033] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of the present invention is shown;

[0034] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of the present invention is shown;

[0035] Figure 16 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-3 of the present invention is shown;

[0036] Figures 17 to 19 The on-axis chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 of the present invention are shown respectively.

[0037] Figure 20 The diagram shows the assembly stress analysis contour plot of the optical imaging lens of Scheme 1 of the present invention when EP01 / CT1 = 6.00 and (D1s-d1s) / R2 = 2.03.

[0038] Figure 21 The assembly stress analysis contour plot of the optical imaging lens of Comparative Example 1 is shown when EP01 / CT1 = 6.00 and (D1s-d1s) / R2 = 1.00 is satisfied;

[0039] Figure 22 The assembly stress analysis contour plot of the optical imaging lens of Comparative Example 2 is shown when EP01 / CT1 = 6.00 and (D1s-d1s) / R2 = 2.80 is satisfied.

[0040] The above figures include the following reference numerals:

[0041] P0, Lens barrel; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; E5, Fifth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; E6, Sixth lens; S11, Object-side surface of the sixth lens; S12, Image-side surface of the sixth lens; E7, Seventh lens; S13, Object-side surface of the seventh lens; S14, Image-side surface of the seventh lens; P1, First spacer; P2, Second spacer; P3, Third spacer; P4, Fourth spacer; P5, Fifth spacer; P6, Sixth spacer; P7, Pressure ring. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] In this invention, 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 invention.

[0045] 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.

[0046] 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.

[0047] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In this application, the left side is the object side, and the right side is the image side.

[0048] To address the problem that existing seven-element optical imaging lenses have an unreasonable front lens shape, which makes the lens prone to deformation or even breakage due to stress concentration during assembly, thus affecting the assembly stability of the optical imaging lens, this invention provides an optical imaging lens.

[0049] like Figures 1 to 20 As shown, in an optional embodiment of this application, an optical imaging lens is provided, including a lens barrel and a lens group and a plurality of spacers disposed in the lens barrel. The lens group consists of seven lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The plurality of spacers includes a first spacer disposed between the first lens and the second lens and in contact with the image side of the first lens. The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer on the optical axis of the optical imaging lens satisfies the following relationship between the center thickness CT1 of the first lens on the optical axis: 5.63≤EP01 / CT1≤7.25. The outer diameter D1s of the object side face of the first spacer, the inner diameter d1s of the object side face of the first spacer, and the radius of curvature R2 of the image side face of the first lens satisfy the following relationship: 1.30≤(D1s-d1s) / R2≤2.50.

[0050] The optical imaging lens of this application consists of a lens barrel, seven lenses disposed within the lens barrel, and multiple spacers. By reasonably arranging the positions of the seven lenses and the first spacer, and setting 5.63≤EP01 / CT1≤7.25, it can be seen that the center thickness of the first lens is thinner than the thickness of the edge portion of the first lens. This can easily lead to unreasonable surface shape and design of the first lens, which in turn can cause excessive local stress on the first lens during assembly, making it prone to deformation or even breakage, thus affecting the final assembly accuracy and stability of the optical imaging lens. Therefore, by constraining 1.30≤(D1s-d1s) / R2≤2.50, this application controls the ratio of the difference between the outer and inner diameters of the object side of the first spacer to the radius of curvature of the image side of the first lens. This helps to constrain the contact area between the first spacer and the first lens, thereby precisely controlling the fit between the first lens and the second lens. At the same time, it can effectively adjust the overall shape of the first lens, avoiding improper assembly and stress concentration during the assembly process due to the shape of the first lens and the first spacer, which could lead to deformation or breakage of the first lens. This ensures the assembly accuracy and stability between the lens barrel, the first lens, the first spacer, and the second lens, thereby improving the assembly stability of the optical imaging lens.

[0051] In addition, please refer to Table 1 below. Figures 20 to 22 As shown, under the premise that the optical imaging lens satisfies 5.63≤EP01 / CT1≤7.25, for example, EP01 / CT1=6.00, Figure 20 The diagram shows the assembly stress analysis contour plot when the optical imaging lens of Scheme 1 of the present invention satisfies (D1s-d1s) / R2=2.03; Figure 21 The assembly stress analysis contour plot of the optical imaging lens in Comparative Example 1 is shown when (D1s-d1s) / R2=1.00; Figure 22 The assembly stress analysis contour plot of the optical imaging lens in Comparative Example 2 is shown when (D1s-d1s) / R2=2.80.

[0052] Depend on Figures 20 to 22As shown, when the optical imaging lens satisfies (D1s-d1s) / R2 = 2.03, the maximum stress of the first lens is 2.1903 MPa, and the minimum stress is 0.010005 MPa. Furthermore, with a fit of 0.005 mm, the maximum stress on the first lens is less than 3 MPa. Therefore, the first lens experiences relatively low stress during assembly, resulting in a lower risk of deformation and better assembly stability. Conversely, when the optical imaging lens satisfies (D1s-d1s) / R2 = 1.00, the maximum stress of the first lens is 3.3090 MPa, and the minimum stress is 0.030586 MPa. Furthermore, with a fit of 0.005 mm, the maximum stress on the first lens exceeds 3 MPa. This indicates that the first lens experiences higher stress during assembly, leading to a greater risk of deformation and breakage, and poorer assembly stability. When the optical imaging lens satisfies (D1s-d1s) / R2 = 2.80, the maximum stress of the first lens is 3.9415 MPa, and the minimum stress is 0.0057862 MPa. Furthermore, with a fit of 0.005 mm, the maximum stress on the first lens exceeds 3 MPa. This indicates that the first lens experiences significant stress during assembly, leading to a higher risk of deformation and breakage, and poor assembly stability. Therefore, when 5.63 ≤ EP01 / CT1 ≤ 7.25 and (D1s-d1s) / R2 is controlled between 1.30 and 2.50, the shape of the first lens is more reasonable, resulting in the lowest stress during assembly, the lowest risk of deformation, and the best assembly stability.

[0053] Therefore, this application, by constraining 5.63≤EP01 / CT1≤7.25 and 1.30≤(D1s-d1s) / R2≤2.50, compresses the thickness of the object-side structure of the lens barrel, the center thickness and edge thickness of the first lens, and the axial dimension of the front-end structure, to ensure the structural compactness of the optical imaging lens, achieve a reasonable spatial layout of the optical imaging lens, and simultaneously meet the optical performance requirements of the optical imaging lens. While ensuring the compactness of the front-end structure, it controls the ratio of the difference between the outer and inner diameters of the object-side surface of the first spacer to the radius of curvature of the image-side surface of the first lens. This helps to constrain the contact area between the first spacer and the first lens, thereby precisely controlling the fit between the first lens and the second lens. Simultaneously, it can effectively adjust the overall shape of the first lens, avoiding improper assembly and stress concentration during assembly due to the shape of the first lens and the first spacer, which could lead to deformation or breakage of the first lens. This ensures the assembly accuracy and stability between the lens barrel, the first lens, the first spacer, and the second lens, thereby improving the assembly stability of the optical imaging lens.

[0054] Table 1

[0055] EP01 / CT1 6.00 6.00 6.00 (D1s-d1s) / R2 2.03 1.10 2.80

[0056] In this embodiment, the plurality of spacers further includes a second spacer placed between the second lens and the third lens and in contact with the image side of the second lens, a third spacer placed between the third lens and the fourth lens and in contact with the image side of the third lens, a fourth spacer placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, a fifth spacer placed between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, and a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens.

[0057] In this embodiment, the center thickness CT2 of the second lens on the optical axis and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 3.93 ≤ CT2 / CT1 ≤ 6.28. By controlling this condition, the ratio of the center thicknesses of the second and first lenses on the optical axis can be effectively controlled, which helps to ensure the reasonable thickness of the first and second lenses, balances the optical performance, assembly stability, and manufacturing feasibility of the first and second lenses, and ensures that the optical imaging lens achieves the expected results in practical applications.

[0058] In this embodiment, the air gap T12 between the first and second lenses on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the distance EP12 between the image side of the first spacer and the object side of the second spacer on the optical axis satisfy the following condition: 1.21 ≤ (T12 + CT2) / EP12 ≤ 1.64. By controlling the relationship between the air gap between the first and second lenses on the optical axis, the center thickness of the second lens on the optical axis, and the distance between the image side of the first spacer and the object side of the second spacer on the optical axis, it is beneficial to compress the size and spacing of the front-end structural components, optimize the fit between the spacer and the lens, and improve the assembly stability of the first lens, first spacer, second lens, and second spacer in the lens barrel. This ensures that the optical imaging lens can perform well in practical applications and guarantees the reliability of the optical imaging lens.

[0059] In this embodiment, the distance EP23 between the image-side surface of the second spacer and the object-side surface of the third spacer on the optical axis, the air gap T23 between the second and third lenses on the optical axis, and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following: 1.15 ≤ EP23 / (T23+T34) ≤ 3.20. By constraining the proportional relationship between the distance EP23 between the image-side surface of the second spacer and the object-side surface of the third spacer on the optical axis and the sum of the air gaps between the second and third lenses on the optical axis and the air gaps between the third and fourth lenses on the optical axis, the assembly process of the second lens, third lens, fourth lens, second spacer, and third spacer can be simplified, the assembly difficulty and assembly error can be reduced, and the production efficiency can be improved. At the same time, the aberration correction of the optical imaging lens can be optimized, and the imaging quality of the optical imaging lens can be improved.

[0060] In this embodiment, the distance EP56 between the image-side surface of the fifth spacer and the object-side surface of the sixth spacer on the optical axis satisfies the following ratio: 2.81 ≤ EP56 / CT6 ≤ 3.53. By limiting the ratio of the distance between the image-side surface of the fifth spacer and the object-side surface of the sixth spacer on the optical axis to the center thickness of the sixth lens on the optical axis, it is ensured that the distance design of the fifth and sixth spacers matches the thickness of the sixth lens on the optical axis. This avoids interference between the sixth lens and adjacent structures or excessive gaps between the sixth lens and adjacent lenses during assembly. It also ensures that the fifth and sixth spacers can stably support the sixth lens, reducing deformation of the optical imaging lens under vibration or temperature changes and improving the assembly stability of the optical imaging lens.

[0061] In this embodiment, the radius of curvature R5 of the object-side surface of the third lens and the outer diameter D2m of the image-side surface of the second spacer satisfy the following ratio: 0.58 ≤ R5 / D2m ≤ 1.42. By constraining the ratio of the radius of curvature of the object-side surface of the third lens to the outer diameter of the image-side surface of the second spacer, the curvature design of the third lens can be optimized, ensuring the rationality of the surface shape of the third lens. This corrects aberrations such as spherical aberration and coma, improving the imaging quality of the optical imaging lens. Simultaneously, it also helps optimize the matching relationship between the shape of the third lens and the outer diameter of the image-side surface of the second spacer, ensuring the optical performance of the optical imaging lens.

[0062] In this embodiment, the outer diameter D3s of the object-side surface of the third spacer, the inner diameter d3s of the object-side surface of the third spacer, and the radius of curvature R6 of the image-side surface of the third lens satisfy the following relationship: -2.48 ≤ (D3s - d3s) / R6 ≤ -1.26. By controlling the ratio of the difference between the outer and inner diameters of the object-side surface of the third spacer to the radius of curvature of the image-side surface of the third lens, it can be ensured that the third spacer acts as an aperture stop in the optical imaging lens, thereby effectively blocking stray light and reducing the impact of stray light on image quality. Simultaneously, it helps to ensure that the mating surfaces of the third spacer and the third lens meet the assembly stability requirements during assembly, thus ensuring the optical performance of the optical imaging lens.

[0063] In this embodiment, the inner diameter d3m of the image-side surface of the third spacer, the inner diameter d4s of the object-side surface of the fourth spacer, and the radius of curvature R7 of the object-side surface of the fourth lens satisfy the following condition: 1.04 ≤ (d3m + d4s) / R7 ≤ 1.72. By controlling the relationship between the inner diameters of the image-side surface of the third spacer, the inner diameters of the object-side surface of the fourth spacer, and the radius of curvature of the object-side surface of the fourth lens, the optical performance of the fourth lens can be optimized, thereby reducing imaging aberrations and improving imaging resolution. Furthermore, if there are minor dimensional deviations during actual manufacturing, controlling the above conditional expression within a reasonable range helps to reduce the impact of manufacturing deviations of the fourth lens, the third spacer, and the fourth spacer on overall performance, ensuring that the optical performance of the optical imaging lens meets the expected requirements.

[0064] In this embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the inner diameter d4m of the image-side surface of the fourth spacer satisfy the following ratio: -2.44 ≤ R9 / d4m ≤ 2.87. By controlling the ratio of the radius of curvature of the object-side surface of the fifth lens to the inner diameter of the image-side surface of the fourth spacer, the surface shape of the fifth lens can be effectively controlled, which helps to optimize aberrations such as spherical aberration, coma, and astigmatism, thereby improving the imaging quality of the optical imaging lens. At the same time, it can also avoid the situation where the shape of the fifth lens is too complex or the fifth lens is difficult to manufacture, which is beneficial to improving the matching degree between the fifth lens and the fourth spacer and reducing the production cost and processing difficulty of the optical imaging lens.

[0065] In this embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy the following relationship: -4.45 ≤ R11 / R10 ≤ -2.47. By controlling the ratio of the radius of curvature of the object-side surface of the sixth lens to that of the image-side surface of the fifth lens, the contribution of the effective focal lengths of the fifth and sixth lenses to the effective focal length of the optical imaging lens can be precisely controlled, thereby meeting the imaging requirements of the optical imaging lens. Furthermore, a reasonable radius of curvature design helps optimize the light transmission path in the fifth and sixth lenses, reducing light loss and improving imaging efficiency, thereby correcting various aberrations such as spherical aberration and coma, and improving the imaging quality of the optical imaging lens.

[0066] In this embodiment, the outer diameter D6s of the object-side surface of the sixth spacer, the inner diameter d6s of the object-side surface of the sixth spacer, and the radius of curvature R12 of the image-side surface of the sixth lens satisfy the following relationship: 1.85 ≤ (D6s - d6s) / R12 ≤ 2.86. By controlling the ratio of the difference between the outer and inner diameters of the object-side surface of the sixth spacer to the radius of curvature of the image-side surface of the sixth lens, the effective focal length and optical path design of the optical imaging lens are ensured to be within a reasonable range. This avoids the problem of unstable lens group structure caused by excessively large or small radius of curvature of the image-side surface of the sixth lens. At the same time, it also ensures the structural strength and durability of the optical imaging lens, avoiding situations where the shape of the sixth lens is too complex or the sixth lens is difficult to manufacture, thereby reducing the production cost and processing difficulty of the optical imaging lens.

[0067] In this embodiment, the radius of curvature R13 of the object-side surface of the seventh lens and the inner diameter d6m of the image-side surface of the sixth spacer satisfy the following ratio: 3.80 ≤ R13 / d6m ≤ 4.89. By controlling the ratio of the radius of curvature of the object-side surface of the seventh lens to the inner diameter of the image-side surface of the sixth spacer, the surface shape and size of the seventh lens can be controlled to a certain extent, thereby controlling the overall size of the lens group. Simultaneously, it ensures that light can pass smoothly through the seventh lens, guarantees that the sixth spacer can effectively intercept stray light, reduce unnecessary reflections and scattering, and further more effectively correct aberrations such as spherical aberration and coma, thereby improving the imaging quality of the optical imaging lens.

[0068] In this embodiment, the first lens has positive optical power, and both its object-side and image-side surfaces are concave; the sixth lens has positive optical power, and both its object-side and image-side surfaces are convex; the seventh lens has negative optical power, and both its object-side and image-side surfaces are convex; the second lens has positive optical power, and both its object-side and image-side surfaces are convex; the third lens has negative optical power, and both its object-side and image-side surfaces are convex; the fourth lens has optical power, and its object-side surface is convex; the fifth lens has positive optical power, and its image-side surface is convex. By rationally planning the optical power and surface shape of each lens, it is beneficial to control the light path, ensure the stability of light transmission, eliminate aberrations, and ensure image quality.

[0069] Optionally, the optical imaging lens in the embodiments of this application can be simulated using software and / or tools such as ZEMAX and CODEV. During the simulation process using such software and / or tools, the surface profile of each lens can be appropriately adjusted according to the surface profile simulation provided by the software and / or tools used.

[0070] 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.

[0071] In this embodiment, each spacer can be optionally configured as a chamfered spacer. The outer circumferential surface of the chamfered spacer has a chamfered portion and a non-chamfered portion, and the outer diameter of the chamfered portion is smaller than the outer diameter of the non-chamfered portion. The outer diameter of the chamfered spacer typically refers to the maximum outer diameter of the non-chamfered portion.

[0072] In another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel and a lens group and a plurality of spacers disposed in the lens barrel. The lens group consists of seven lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The plurality of spacers includes a first spacer disposed between the first lens and the second lens and in contact with the image side of the first lens. The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer on the optical axis of the optical imaging lens satisfies the following condition: 5.63≤EP01 / CT1≤7.25. The air gap T12 between the first lens and the second lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the distance EP12 between the image side face of the first spacer and the object side face of the second spacer on the optical axis satisfy the following condition: 1.21≤(T12+CT2) / EP12≤1.64.

[0073] The optical imaging lens of this application consists of a lens barrel, seven lenses disposed within the lens barrel, and multiple spacers. By reasonably arranging the positions of the seven lenses and the first spacer, and setting 5.63≤EP01 / CT1≤7.25, it can be seen that the center thickness of the first lens is thinner than the thickness of the edge portion of the first lens. This can easily lead to unreasonable surface shape and design of the first lens, which in turn can cause excessive local stress on the first lens during assembly, making it prone to deformation or even breakage, thus affecting the final assembly accuracy and stability of the optical imaging lens. Therefore, this application controls the relationship between the air gap between the first lens and the second lens on the optical axis, the center thickness of the second lens on the optical axis, and the distance between the image side of the first spacer and the object side of the second spacer on the optical axis by constraining 1.21≤(T12+CT2) / EP12≤1.64. This is beneficial for compressing the size and spacing of the front-end structural components, optimizing the fit between the spacer and the lens, and improving the assembly stability of the first lens, the first spacer, the second lens, and the second spacer in the lens barrel. This ensures that the optical imaging lens can perform well in practical applications and guarantees the reliability of the optical imaging lens.

[0074] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0075] In another optional embodiment of this application, an optical imaging lens is provided, including a lens barrel and a lens group and a plurality of spacers disposed in the lens barrel. The lens group consists of seven lenses, which are arranged sequentially from the object side to the image side as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The plurality of spacers includes a first spacer disposed between the first lens and the second lens and in contact with the image side of the first lens. The distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer on the optical axis of the optical imaging lens and the center thickness CT1 of the first lens on the optical axis satisfy the following: 5.63≤EP01 / CT1≤7.25. The radius of curvature R1 of the object side face of the first lens, the radius of curvature R2 of the image side face of the first lens and the inner diameter d1s of the object side face of the first spacer satisfy the following: -2.99≤(R1+R2) / d1s≤-0.85.

[0076] The optical imaging lens of this application consists of a lens barrel, seven lenses disposed within the lens barrel, and multiple spacers. By rationally arranging the positions of the seven lenses and the first spacer, and setting 5.63≤EP01 / CT1≤7.25, it is evident that the center thickness of the first lens is thinner than the thickness of its edge portion. This can easily lead to unreasonable surface shape and design of the first lens, resulting in excessive local stress on the first lens during assembly, potentially causing deformation or even breakage, thus affecting the final assembly accuracy and stability of the optical imaging lens. Therefore, this application constrains the curvature of the object-side and image-side of the first lens to a reasonable range by setting -2.99≤(R1+R2) / d1s≤-0.85, avoiding the risk of excessive assembly stress due to an unreasonable first lens shape. Simultaneously, it ensures stable assembly of the first lens and the first spacer within the lens barrel, guaranteeing assembly stability.

[0077] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0078] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0079] 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.

[0080] Figure 1 A schematic diagram showing the dimensions of an optical imaging lens according to this application is provided. Figure 1 The figures indicate parameters such as EP01, EP12, EP23, EP56, d1s, D1s, D2m, D3s, d3s, d3m, d4s, d4m, d6s, d6m, and D6s to provide a clear and intuitive understanding of their meaning. To facilitate the description of optical imaging lenses and specific lens shapes, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0081] 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.

[0082] 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. In the three examples within the same embodiment, the curvature radius, center thickness, and other parameters of the optical imaging lens from the first to the seventh lens, as well as the spacing distance between the lenses and the higher-order coefficients, are the same. However, the thickness, inner diameter, and outer diameter of the lens barrel, the first to sixth spacers, and the pressure ring are different.

[0083] 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.

[0084] Example 1

[0085] like Figures 2 to 7 As shown, the optical imaging lens of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 3 The diagram shows the structure of the optical imaging lens in Embodiments 1-2. Figure 4 A schematic diagram of the optical imaging lens of Embodiments 1-3 is shown.

[0086] like Figures 2 to 4 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 fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, and a seventh lens E7, which are sequentially arranged along the optical axis from the object side to the image side. In this embodiment, a retaining ring P7 is also provided on the image side of the seventh lens E7.

[0087] like Figure 2 The diagram shows a schematic of the optical imaging lens in Embodiment 1-1. In this example, the object-side and image-side of the first spacer P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer P4 are in contact with the image-side S8 of the fourth lens and the object-side S9 of the fifth lens, respectively. The object-side and image-side of the fifth spacer P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The object-side and image-side of the sixth spacer P6 are in contact with the image-side S12 of the sixth lens and the object-side S13 of the seventh lens, respectively. The object-side of the retaining ring P7 is in contact with the image-side S14 of the seventh lens.

[0088] like Figure 3 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 1-2. The bearing and contact methods of each spacer are the same as in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0089] like Figure 4 The diagram shown is a structural schematic of the optical imaging lens of Embodiments 1-3. The bearing and contact methods of each spacer are the same as in Embodiment 1-1, and can be referred to the relevant description in Embodiment 1-1, which will not be repeated here.

[0090] In summary, the structural parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 2.

[0091] Table 2

[0092] EP01(mm) 2.528 2.539 2.583 EP12(mm) 1.773 1.769 1.693 EP23(mm) 0.677 0.677 0.727 EP56(mm) 1.262 1.262 1.111 d1s(mm) 3.146 3.081 3.036 D1s(mm) 7.981 9.978 9.135 D2m(mm) 8.401 10.221 9.379 D3s(mm) 8.552 10.408 9.565 d3s(mm) 2.682 2.682 2.688 d3m(mm) 2.682 2.682 2.688 d4s(mm) 2.728 2.737 2.654 d4m(mm) 2.728 2.737 2.654 d6s(mm) 3.618 3.618 3.381 d6m (mm) 3.618 3.618 3.381 D6s(mm) 9.043 11.022 10.179

[0093] In Embodiment 1, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave.

[0094] In Example 1, the effective focal length f1 of the first lens is 11.93 mm, the effective focal length f2 of the second lens is 6.67 mm, the effective focal length f3 of the third lens is -11.11 mm, the effective focal length f4 of the fourth lens is -46.89 mm, the effective focal length f5 of the fifth lens is 178.52 mm, the effective focal length f6 of the sixth lens is 6.45 mm, and the effective focal length f7 of the seventh lens is -5.95 mm.

[0095] Table 3 shows the basic structural parameters of the optical imaging lens in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the second lens E2 and the third lens E3. S15 and S16 (not shown in the figure) can be the object-side and image-side of the filter or the object-side and image-side of the protective glass. S17 (not shown in the figure) is the imaging plane.

[0096] Table 3

[0097]

[0098]

[0099] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the seventh lens E7 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0100]

[0101] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S1-S14 in Example 1.

[0102] Table 4

[0103]

[0104]

[0105] Figure 5 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 6 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 7 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0106] according to Figures 5 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0107] Example 2

[0108] like Figures 8 to 13 As shown, the optical imaging lens of Embodiment 2 is described. Figure 8 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown. Figure 10 A schematic diagram of the optical imaging lens of Embodiments 2-3 is shown.

[0109] like Figures 8 to 10 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 fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, and a seventh lens E7, which are sequentially arranged along the optical axis from the object side to the image side. In this embodiment, a retaining ring P7 is also provided on the image side of the seventh lens E7.

[0110] like Figure 8The diagram shows a schematic of the optical imaging lens in Embodiment 2-1. In this example, the object-side and image-side of the first spacer P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer P4 are in contact with the image-side S8 of the fourth lens and the object-side S9 of the fifth lens, respectively. The object-side and image-side of the fifth spacer P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The object-side and image-side of the sixth spacer P6 are in contact with the image-side S12 of the sixth lens and the object-side S13 of the seventh lens, respectively. The object-side of the retaining ring P7 is in contact with the image-side S14 of the seventh lens.

[0111] like Figure 9 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-2. The bearing and contact methods of each spacer are the same as in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0112] like Figure 10 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-3. The bearing and contact methods of each spacer are the same as in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0113] In summary, the structural parameters of the optical imaging lens of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 5.

[0114] Table 5

[0115] EP01(mm) 1.972 1.972 1.972 EP12(mm) 2.173 2.177 2.208 EP23(mm) 0.721 0.721 0.386 EP56(mm) 1.047 1.047 1.047 d1s(mm) 3.402 3.402 3.429 D1s(mm) 6.587 9.225 7.699 D2m(mm) 7.164 9.431 8.276 D3s(mm) 7.325 9.609 8.437 d3s(mm) 2.635 2.635 2.567 d3m(mm) 2.635 2.635 2.567 d4s(mm) 2.702 2.702 2.656 d4m(mm) 2.702 2.702 2.656 d6s(mm) 3.124 3.124 3.124 d6m (mm) 3.124 3.124 3.124 D6s(mm) 8.299 10.649 11.015

[0116] In Embodiment 2, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave.

[0117] In Example 2, the effective focal length f1 of the first lens is 9.41 mm, the effective focal length f2 of the second lens is 10.45 mm, the effective focal length f3 of the third lens is -13.39 mm, the effective focal length f4 of the fourth lens is 63.33 mm, the effective focal length f5 of the fifth lens is 76.61 mm, the effective focal length f6 of the sixth lens is 11.04 mm, and the effective focal length f7 of the seventh lens is -5.59 mm.

[0118] Table 6 shows the basic structural parameters of the optical imaging lens in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the second lens E2 and the third lens E3. S15 and S16 (not shown in the figure) can be the object-side and image-side surfaces of the filter or the object-side and image-side surfaces of the protective glass. S17 (not shown in the figure) is the imaging plane.

[0119] Table 6

[0120]

[0121]

[0122] Table 7 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical lens S1-S14 in Example 2. The surface shape of each aspherical lens is defined according to formula (1) in Example 1.

[0123] Table 7

[0124]

[0125]

[0126] Figure 11 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 12 The astigmatism curve of the optical imaging lens of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0127] according to Figures 11 to 13 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0128] Example 3

[0129] like Figures 14 to 19 As shown, the optical imaging lens of Embodiment 3 is described. Figure 14 A schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical imaging lens of Embodiment 3-2 is shown. Figure 16 A schematic diagram of the optical imaging lens of Embodiment 3-3 is shown.

[0130] like Figures 14 to 16 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 fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, and a seventh lens E7, which are sequentially arranged along the optical axis from the object side to the image side. In this embodiment, a retaining ring P7 is also provided on the image side of the seventh lens E7.

[0131] like Figure 14 The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. In this example, the object-side and image-side of the first spacer P1 are in contact with the image-side S2 of the first lens and the object-side S3 of the second lens, respectively. The object-side and image-side of the second spacer P2 are in contact with the image-side S4 of the second lens and the object-side S5 of the third lens, respectively. The object-side and image-side of the third spacer P3 are in contact with the image-side S6 of the third lens and the object-side S7 of the fourth lens, respectively. The object-side and image-side of the fourth spacer P4 are in contact with the image-side S8 of the fourth lens and the object-side S9 of the fifth lens, respectively. The object-side and image-side of the fifth spacer P5 are in contact with the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. The object-side and image-side of the sixth spacer P6 are in contact with the image-side S12 of the sixth lens and the object-side S13 of the seventh lens, respectively. The object-side of the retaining ring P7 is in contact with the image-side S14 of the seventh lens.

[0132] like Figure 15 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-2. The bearing and contact methods of each spacer are the same as in Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0133] like Figure 16 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-3. The bearing and contact methods of each spacer are the same as in Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0134] In summary, the structural parameters of the optical imaging lens of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 8.

[0135] Table 8

[0136]

[0137]

[0138] In Embodiment 3, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is concave. The object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is concave. The object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is convex. The object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is convex. The object-side surface S9 of the fifth lens is convex, and the image-side surface S10 of the fifth lens is convex. The object-side surface S11 of the sixth lens is convex, and the image-side surface S12 of the sixth lens is concave. The object-side surface S13 of the seventh lens is convex, and the image-side surface S14 of the seventh lens is concave.

[0139] In Embodiment 3, the effective focal length f1 of the first lens is 7.40 mm, the effective focal length f2 of the second lens is 11.51 mm, the effective focal length f3 of the third lens is -11.11 mm, the effective focal length f4 of the fourth lens is -44.99 mm, the effective focal length f5 of the fifth lens is 53.56 mm, the effective focal length f6 of the sixth lens is 7.13 mm, and the effective focal length f7 of the seventh lens is -5.86 mm.

[0140] Table 9 shows the basic structural parameters of the optical imaging lens in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, located between the second lens E2 and the third lens E3. S15 and S16 (not shown in the figure) can be the object-side and image-side of the filter or the object-side and image-side of the protective glass. S17 (not shown in the figure) is the imaging plane.

[0141] Table 9

[0142]

[0143]

[0144] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical lens S1-S14 in Example 3. The surface shape of each aspherical lens is defined according to formula (1) in Example 1.

[0145] Table 10

[0146]

[0147] Figure 17 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 18 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 19 The magnification chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical imaging lens.

[0148] according to Figures 17 to 19 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0149] In summary, Examples 1 to 3 satisfy the relationships shown in Table 11.

[0150] Table 11

[0151] EP01 / CT1 7.09 7.12 7.25 5.63 5.63 5.63 5.98 6.00 6.00 CT2 / CT1 4.61 4.61 4.61 3.93 3.93 3.93 6.28 6.28 6.28 (T12+CT2) / EP12 1.37 1.37 1.43 1.23 1.22 1.21 1.56 1.64 1.52 EP23 / (T23+T34) 1.19 1.19 1.27 2.15 2.15 1.15 2.81 3.20 2.88 EP56 / CT6 3.53 3.53 3.10 2.99 2.99 2.99 2.81 2.95 3.01 (D1s-d1s) / R2 1.75 2.50 2.21 1.30 2.38 1.75 1.74 2.03 1.31 R5 / D2m 1.10 0.91 0.99 1.42 1.08 1.23 0.64 0.58 0.75 (D3s-d3s) / R6 -1.88 -2.48 -2.20 -1.26 -1.88 -1.58 -1.82 -2.05 -1.36 (d3m+d4s) / R7 1.06 1.06 1.04 1.72 1.72 1.68 1.43 1.43 1.43 R9 / d4m 1.78 1.78 1.83 -2.39 -2.39 -2.44 2.82 2.82 2.87 R11 / R10 -2.47 -2.47 -2.47 -2.96 -2.96 -2.96 -4.45 -4.45 -4.45 (D6s-d6s) / R12 1.88 2.57 2.36 1.88 2.73 2.86 1.85 2.05 1.96 R13 / d6m 4.57 4.57 4.89 3.80 3.80 3.80 3.92 3.92 3.92 (R1+R2) / d1s -2.37 -2.42 -2.46 -2.99 -2.99 -2.97 -0.85 -0.85 -0.85

[0152] Table 12 shows the effective focal lengths of each lens in the optical imaging lenses of Embodiments 1 to 3.

[0153] Table 12

[0154] f1(mm) 11.93 9.41 7.40 f2 (mm) 6.67 10.45 11.51 f3 (mm) -11.11 -13.39 -11.11 f4 (mm) -46.89 63.33 -44.99 f5 (mm) 178.52 76.61 53.56 f6 (mm) 6.45 11.04 7.13 f7 (mm) -5.95 -5.59 -5.86

[0155] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0156] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0157] 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.

[0158] 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.

[0159] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that, Includes a lens barrel and a lens assembly and multiple spacers disposed within the lens barrel. The lens group consists of seven lenses, which are arranged in the following order from the object side to the image side: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens. The first lens has positive optical power, and its object-side surface and image-side surface are both concave. The second lens has positive optical power, and its object-side surface and image-side surface are both convex. The third lens has negative optical power, and its object-side surface and image-side surface are both convex. The fourth lens has optical power, and its object-side surface is convex. The fifth lens has positive optical power, and its image-side surface is convex. The sixth lens has positive optical power, and its object-side surface and image-side surface are both convex. The seventh lens has negative optical power, and its object-side surface and image-side surface are both convex. The plurality of spacers includes a first spacer disposed between the first lens and the second lens and in contact with the image side of the first lens; The distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer on the optical axis of the optical imaging lens satisfies the following relationship between the center thickness CT1 of the first lens on the optical axis: 5.63≤EP01 / CT1≤7.25; the outer diameter D1s of the object-side surface of the first spacer, the inner diameter d1s of the object-side surface of the first spacer, and the radius of curvature R2 of the image-side surface of the first lens satisfies the following relationship between: 1.30≤(D1s-d1s) / R2≤2.50; and the center thickness CT2 of the second lens on the optical axis satisfies the following relationship between the center thickness CT1 of the first lens on the optical axis: 3.93≤CT2 / CT1≤6.

28.

2. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a second spacer disposed between the second lens and the third lens and in 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, the center thickness CT2 of the second lens on the optical axis, and the distance EP12 between the image side of the first spacer and the object side of the second spacer on the optical axis satisfy the following: 1.21≤(T12+CT2) / EP12≤1.

64.

3. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a second spacer disposed between the second lens and the third lens and in contact with the image-side surface of the second lens, and a third spacer disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The distance EP23 between the image side of the second spacer and the object side of the third spacer on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 1.15≤EP23 / (T23+T34)≤3.

20.

4. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image-side surface of the fifth lens, and a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The distance EP56 between the image side of the fifth spacer and the object side of the sixth spacer on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy the following condition: 2.81≤EP56 / CT6≤3.

53.

5. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a second spacer disposed between the second lens and the third lens and in contact with the image-side surface of the second lens. The radius of curvature R5 of the object side of the third lens and the outer diameter D2m of the image side of the second spacer satisfy the following condition: 0.58≤R5 / D2m≤1.

42.

6. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a third spacer disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens. The outer diameter D3s of the object side of the third spacer, the inner diameter d3s of the object side of the third spacer, and the radius of curvature R6 of the image side of the third lens satisfy the following condition: -2.48≤(D3s-d3s) / R6≤-1.

26.

7. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a third spacer disposed between the third lens and the fourth lens and in contact with the image-side surface of the third lens, and a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. The inner diameter d3m of the image side of the third spacer, the inner diameter d4s of the object side of the fourth spacer, and the radius of curvature R7 of the object side of the fourth lens satisfy the following condition: 1.04≤(d3m+d4s) / R7≤1.

72.

8. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens. The radius of curvature R9 of the object side of the fifth lens and the inner diameter d4m of the image side of the fourth spacer satisfy the following condition: -2.44≤R9 / d4m≤2.

87.

9. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R11 of the object side of the sixth lens and the radius of curvature R10 of the image side of the fifth lens satisfy the following condition: -4.45≤R11 / R10≤-2.

47.

10. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The outer diameter D6s of the object side of the sixth spacer, the inner diameter d6s of the object side of the sixth spacer, and the radius of curvature R12 of the image side of the sixth lens satisfy the following condition: 1.85≤(D6s-d6s) / R12≤2.

86.

11. The optical imaging lens according to claim 1, characterized in that, The plurality of spacers also includes a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image-side surface of the sixth lens. The radius of curvature R13 of the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer satisfy the following condition: 3.80≤R13 / d6m≤4.89.

Images