Optical imaging lens

Abstract

The application provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group 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: 4.36<=f4 / EP34<=10.94; and 0.61<=R7 / (D4s-d4s)<=1.11. The application solves the problem that the focal length and the edge size of the middle lens in the seven-piece optical imaging lens in the prior art are difficult to control, the size of the spacer in contact with the middle lens is difficult to consider the effects of passing the edge imaging light and intercepting stray light, and the increase of stray light is caused.

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 modern optical design, seven-element optical imaging lenses are widely used in mobile devices, surveillance cameras, automotive driver assistance systems, drone photography, and various portable electronic devices due to their high optical performance and compact design. However, despite the good image quality they offer, this lens structure faces numerous technical challenges.

[0003] Currently, existing seven-element optical imaging lenses control the lens's shape, appearance, and assembly by controlling the edge size and focal length of the intermediate lens. However, this approach also introduces a series of problems. First, the small edge size of the intermediate lens limits the size of the spacers it contacts, thus restricting the path of edge imaging light rays and affecting the overall field of view and angular resolution of the optical imaging lens. Second, the longer focal length makes the beam path inside the optical imaging lens more complex. If the size of the spacers is not appropriate, it will be difficult to intercept stray light, increasing the probability of stray light generation. This means that non-imaging light rays are reflected or refracted inside the optical imaging lens before reaching the imaging surface, causing glare, ghosting, and other phenomena in the image, thus reducing image quality.

[0004] In other words, the existing seven-element optical imaging lens has the limitation of controlling the focal length and edge size of the central lens. This makes it difficult for the size of the spacer that contacts it to simultaneously accommodate the passage of edge imaging light and the interception of stray light, thus leading to an increase in stray light. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging lens that addresses the problem in existing seven-element optical imaging lenses where controlling the focal length and edge size of the central lens makes it difficult for the size of the spacer in contact with it to simultaneously accommodate the passage of edge imaging light and the interception of stray light, thus leading to an increase in stray light.

[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 disposed within the lens barrel, and at least one spacer. 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 fourth lens has positive optical power, and the object side of the fourth lens is convex. The at least one spacer includes a third spacer disposed between the third and fourth lenses and in contact with the image side of the third lens, and a fourth spacer disposed between the fourth and fifth lenses and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer on the optical axis of the optical imaging lens satisfy the following: 4.36 ≤ f4 / EP34 ≤ 10.94. The radius of curvature R7 of the object side of the fourth lens, the outer diameter D4s of the object side of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following: 0.61 ≤ R7 / (D4s-d4s) ≤ 1.11.

[0007] According to another aspect of the present invention, an optical imaging lens is also provided, comprising a lens barrel and a lens group disposed in the lens barrel, and at least one spacer. 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 at least one spacer includes a third spacer disposed between the third and fourth lenses and in contact with the image side of the third lens, and a fourth spacer disposed between the fourth and fifth lenses and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer on the optical axis of the optical imaging lens satisfy the following condition: 4.36 ≤ f4 / EP34 ≤ 10.94. The radius of curvature R8 of 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 condition: 4.28 ≤ |R8+R9| / d4m ≤ 5.52.

[0008] According to another aspect of the present invention, an optical imaging lens is also provided, comprising a lens barrel and a lens group disposed in the lens barrel, and at least one spacer. 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 at least one spacer includes a third spacer disposed between the third and fourth lenses and in contact with the image side of the third lens, and a fourth spacer disposed between the fourth and fifth lenses and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer on the optical axis of the optical imaging lens satisfy the following condition: 4.36≤f4 / EP34≤10.94. The radius of curvature R8 of the image side of the fourth lens, the maximum axial thickness CP4 of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following condition: -0.22mm≤R8×CP4 / d4s≤0.06mm.

[0009] Furthermore, the effective focal length f1 of the first lens, the outer diameter D0s of the object side of the lens barrel, and the inner diameter d0s of the object side of the lens barrel satisfy the following relationship: -2.36≤f1 / (D0s-d0s)≤-0.74.

[0010] Furthermore, at least one spacer also includes a second spacer disposed between the second lens and the third lens and in contact with the image side of the second lens, wherein the combined focal length f23 of the second lens and the third lens and the distance EP23 between the image side of the second spacer and the object side of the third spacer on the optical axis satisfy the following: 5.08≤f23 / EP23≤7.99.

[0011] Furthermore, the radius of curvature R1 of the object side surface of the first lens and the inner diameter d0s of the object side surface of the lens barrel satisfy the following condition: -1.77≤R1 / d0s≤-0.68.

[0012] Furthermore, the center thickness CT2 of the second lens on the optical axis and the air gap T23 between the second and third lenses on the optical axis satisfy the following condition: 3.72≤CT2 / T23≤12.16.

[0013] Furthermore, at least one spacer 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 center thickness CT2 of the second lens on the optical axis, the outer diameter D2s of the object side of the second spacer, and the radius of curvature R3 of the object side of the second lens satisfy the following: 0.60mm≤R3×CT2 / D2s≤2.59mm.

[0014] Furthermore, at least one spacer 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 radius of curvature R4 of the image side of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object side of the second spacer satisfy the following: 2.12mm≤R4×N2 / d2s≤7.08mm.

[0015] Furthermore, the radius of curvature R8 of 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 condition: 4.28≤|R8+R9| / d4m≤5.52.

[0016] Furthermore, the effective focal length f6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy the following condition: -19.76≤f6 / CT6≤-16.10.

[0017] Furthermore, at least one spacer also includes a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image side of the sixth lens, wherein the radius of curvature R12 of the image side of the sixth lens and the inner diameter d6s of the object side of the sixth spacer satisfy the following: 0.62≤R12 / d6s≤1.38.

[0018] Furthermore, the air gap T67 between the sixth and seventh lenses on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy the following condition: 2.13≤T67 / CT6≤3.45.

[0019] Furthermore, at least one spacer also includes a first spacer placed between the first lens and the second lens and in contact with the image side of the first lens. The maximum axial thickness CP1 of the first spacer, the distance EP01 between the object side of the lens barrel and the object side of the first spacer on the optical axis and the center thickness CT1 of the first lens on the optical axis satisfy the following: 4.01≤(EP01+CP1) / CT1≤7.38.

[0020] Furthermore, the radius of curvature R5 of the object side of the third lens, the outer diameter D2m of the image side of the second spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following: 1.09≤R5 / (D2m-d2m)≤3.72.

[0021] Furthermore, the air gap T34 between the third and fourth lenses on the optical axis, the maximum axial thickness CP4 of the fourth spacer, and the air gap T56 between the fifth and sixth lenses on the optical axis satisfy the following condition: 0.38≤(T34+CP4) / T56≤3.10.

[0022] Furthermore, the first lens has negative optical power, and its object-side surface is concave, as is its image-side surface; the second lens has positive optical power, and its object-side surface is convex, as is its image-side surface; the fourth lens has positive optical power, and its object-side surface is convex; the sixth lens has negative optical power, and its object-side surface is convex, as is its image-side surface; the seventh lens has negative optical power, and its object-side surface is convex, as is its image-side surface.

[0023] Furthermore, the third lens has positive optical power, and both its object-side and image-side surfaces are convex; the fifth lens has positive optical power, and its image-side surface is convex.

[0024] Applying the technical solution of this invention, the optical imaging lens of this application consists of a lens barrel and seven lenses disposed within the lens barrel, and at least one spacer. By reasonably arranging the positions of the seven lenses and the third and fourth spacers, and setting 4.36≤f4 / EP34≤10.94, it can be seen that the distance between the third and fourth spacers is smaller than the effective focal length of the fourth lens. In other words, the edge thickness of the fourth lens is smaller than its effective focal length. This can easily lead to an unreasonable design of the radial dimension of the fourth spacer in contact with it. If the radial dimension of the fourth spacer is too large, it will restrict the passage path of edge imaging light. If the radial dimension of the fourth spacer is too small, it will be difficult to intercept stray light from the edge, increasing stray light. Therefore, by constraining 0.61≤R7 / (D4s-d4s)≤1.11, this application controls the range of the ratio between the radius of curvature of the object side surface of the fourth lens and the difference between the outer and inner diameters of the object side surface of the fourth spacer. This effectively controls the radial dimension of the fourth spacer within a reasonable range, avoiding situations where an excessively large radial dimension affects the imaging of the main optical path and an excessively small radial dimension leads to an increase in stray light. This ensures imaging stability, avoids the increase of stray light, and improves the imaging quality of the optical imaging lens. Attached Figure Description

[0025] 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:

[0026] Figure 1 A dimensioned diagram of an optical imaging lens according to an alternative embodiment of the present invention is shown;

[0027] Figure 2 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of the present invention is shown;

[0028] Figure 3 The diagram shows a schematic representation of the optical imaging lens of Embodiments 1-2 of the present invention.

[0029] Figure 4 The diagram shows the structural schematics of the optical imaging lenses of embodiments 1-3 of the present invention;

[0030] 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.

[0031] Figure 8 A schematic diagram of the optical imaging lens of Embodiment 2-1 of the present invention is shown;

[0032] Figure 9 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of the present invention is shown;

[0033] Figure 10 The diagram shows the structural schematics of the optical imaging lenses of embodiments 2-3 of the present invention;

[0034] 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.

[0035] Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of the present invention is shown;

[0036] Figure 15 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of the present invention is shown;

[0037] Figure 16 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-3 of the present invention is shown;

[0038] 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.

[0039] Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 and Figure 25 The following diagrams are shown in sequence: a weld line diagram, a molding and encapsulation diagram, a stress diagram, a stray light simulation diagram, an optical path diagram, and a stray light diagram of the optical imaging lens of Scheme 1 of this application when f4 / EP34=8.95 and R7 / (D4s-d4s)=0.80.

[0040] Figure 26 , Figure 27 , Figure 28The following diagrams are shown in sequence: a molding encapsulation diagram, a stress diagram, and a stray light simulation diagram for the optical imaging lens of Comparative Example 1 when f4 / EP34 = 4.00 and R7 / (D4s-d4s) = 0.58.

[0041] Figure 29 and Figure 30 A schematic diagram of the weld line and a stray light simulation diagram are shown for the optical imaging lens of Comparative Example 2 when f4 / EP34 = 11.50 and R7 / (D4s-d4s) = 1.20, respectively.

[0042] The above figures include the following reference numerals:

[0043] P0, Lens tube; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; 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; P1b, First auxiliary spacer; P2, Second spacer; P3, Third spacer; P4, Fourth spacer; P5, Fifth spacer; P6, Sixth spacer; P6b, Sixth auxiliary spacer; P7, Seventh spacer. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 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.

[0050] In this application, the object side refers to the side of the optical imaging lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging plane. In the following text, the object side of the lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of the lens refers to the surface of the lens facing the imaging plane. In the structural schematic diagram shown in this application, the left side is the object side, and the right side is the image side.

[0051] To address the issue that existing seven-element optical imaging lenses often suffer from problems where controlling the focal length and edge dimensions of the central lens makes it difficult for the spacers in contact with it to simultaneously accommodate the passage of edge imaging light and the interception of stray light, thus leading to an increase in stray light, this invention provides an optical imaging lens.

[0052] like Figures 1 to 30As shown, in an optional embodiment of this application, the optical imaging lens includes a lens barrel, a lens group disposed in the lens barrel, and at least one spacer. 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 fourth lens has positive optical power, and the object side of the fourth lens is convex. The at least one spacer includes a third spacer placed between the third and fourth lenses and in contact with the image side of the third lens, and a fourth spacer placed between the fourth and fifth lenses and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer on the optical axis of the optical imaging lens satisfy the following: 4.36≤f4 / EP34≤10.94. The radius of curvature R7 of the object side of the fourth lens, the outer diameter D4s of the object side of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following: 0.61≤R7 / (D4s-d4s)≤1.11.

[0053] The optical imaging lens of this application consists of a lens barrel, seven lenses disposed within the lens barrel, and at least one spacer. By reasonably arranging the positions of the seven lenses and the third and fourth spacers, and setting 4.36≤f4 / EP34≤10.94, it can be seen that the distance between the third and fourth spacers is relatively small compared to the effective focal length of the fourth lens. In other words, the edge thickness of the fourth lens is relatively small compared to its effective focal length. This can easily lead to an unreasonable design of the radial dimension of the fourth spacer in contact with it. If the radial dimension of the fourth spacer is too large, it will restrict the passage path of edge imaging light. If the radial dimension of the fourth spacer is too small, it will be difficult to intercept edge stray light, increasing stray light. Therefore, by constraining 0.61≤R7 / (D4s-d4s)≤1.11, this application controls the range of the ratio between the radius of curvature of the object side surface of the fourth lens and the difference between the outer and inner diameters of the object side surface of the fourth spacer. This effectively controls the radial dimension of the fourth spacer within a reasonable range, avoiding situations where an excessively large radial dimension affects the imaging of the main optical path and an excessively small radial dimension leads to an increase in stray light. This ensures imaging stability, avoids the increase of stray light, and improves the imaging quality of the optical imaging lens.

[0054] In addition, please refer to Table 1 below and Figures 20 to 30 As shown, Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 and Figure 25The following diagrams are shown in sequence: a weld line diagram, a molding and encapsulation diagram, a stress diagram, a stray light simulation diagram, an optical path diagram, and a stray light diagram of the optical imaging lens of Scheme 1 of this application when f4 / EP34=8.95 and R7 / (D4s-d4s)=0.80. Figure 26 , Figure 27 , Figure 28 The diagrams shown in sequence are the forming and encapsulation schematic, stress diagram, and stray light simulation diagram of the optical imaging lens of Comparative Example 1 when f4 / EP34 = 4.00 and R7 / (D4s-d4s) = 0.58. Figure 29 and Figure 30 A schematic diagram of the weld line and a stray light simulation diagram are shown for the optical imaging lens of Comparative Example 2 when f4 / EP34 = 11.50 and R7 / (D4s-d4s) = 1.20, respectively.

[0055] like Figures 20 to 30 As shown, when the optical imaging lens satisfies f4 / EP34 = 8.95 and R7 / (D4s-d4s) = 0.80, the edge thickness of the fourth lens is relatively small compared to its effective focal length, resulting in a more reasonable edge thickness and fewer appearance issues such as encapsulation. Furthermore, by constraining R7, D4s, and d4s, the radial dimension of the fourth spacer is kept within a reasonable range, reducing additional stray light and exhibiting better performance. However, when the optical imaging lens satisfies f4 / EP34 = 4.00 and R7 / (D4s-d4s) = 0.58, the excessive edge thickness of the fourth lens can easily lead to difficulties in molding and filling, thus resulting in… Figure 26 The encapsulation and other appearance abnormalities shown in the diagram, along with the unreasonable radial dimensions of the fourth spacer, have led to an increase in stray light. Figure 28 Compared to Figure 23 The addition of stray light results in poor performance. When the optical imaging lens meets f4 / EP34 = 11.50 and R7 / (D4s-d4s) = 1.20, the edge thickness of the fourth lens is too thin and the center thickness is too thick, which easily leads to... Figure 29 The weld line shown is abnormal in appearance. At the same time, the unreasonable radial dimensions of the fourth spacer have led to an increase in stray light, resulting in poor performance.

[0056] In summary, when the optical imaging lens satisfies f4 / EP34 = 8.95 and R7 / (D4s-d4s) = 0.80, the edge thickness of the fourth lens and the radial dimension of the fourth spacer are both reasonable, resulting in less stray light. Therefore, by constraining 4.36 ≤ f4 / EP34 ≤ 10.94 and 0.61 ≤ R7 / (D4s-d4s) ≤ 1.11, and while ensuring that the distance between the third and fourth spacers is relatively small compared to the effective focal length of the fourth lens, this application controls the ratio range of the curvature radius of the object-side surface of the fourth lens to the difference between the outer and inner diameters of the object-side surface of the fourth spacer. This effectively manages the radial dimension of the fourth spacer within a reasonable range, avoiding situations where an excessively large radial dimension affects the imaging of the main optical path, or where an excessively small radial dimension leads to an increase in stray light. This ensures imaging stability, prevents the increase of stray light, and improves the imaging quality of the optical imaging lens.

[0057] Table 1

[0058] f4 / EP34 8.95 4.00 11.50 R7 / (D4s-d4s) 0.80 0.58 1.20

[0059] In this embodiment, at least one spacer further includes a first spacer selectively positioned between the first lens and the second lens and in contact with the image side of the first lens, a second spacer positioned between the second lens and the third lens and in contact with the image side of the second lens, a fifth spacer selectively positioned between the fifth lens and the sixth lens and in contact with the image side of the fifth lens, a sixth spacer selectively positioned between the sixth lens and the seventh lens and in contact with the image side of the sixth lens, and a seventh spacer positioned on the image side of the seventh lens and in contact with the image side of the seventh lens.

[0060] In this embodiment, the effective focal length f1 of the first lens, the outer diameter D0s of the object side of the lens barrel, and the inner diameter d0s of the object side of the lens barrel satisfy the following condition: -2.36 ≤ f1 / (D0s-d0s) ≤ -0.74. By controlling the difference between the outer and inner diameters of the object side of the lens barrel, the wall thickness at the entrance aperture of the lens barrel is avoided from being too thin, which helps to increase the assembly strength of the optical imaging lens head and avoids the risk of assembly deformation. By controlling the effective focal length of the first lens, the field of view and edge structure position of the first lens are controlled. This reduces the increase in stray light sensitivity caused by the shrinkage of the entrance aperture of the lens barrel. Through this condition, the assembly accuracy of the optical imaging lens is effectively improved, the forming stability is guaranteed, and the stray light sensitivity is improved.

[0061] In this embodiment, the combined focal length f23 of the second and third lenses and 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 satisfy the following ratio: 5.08 ≤ f23 / EP23 ≤ 7.99. Controlling this ratio controls the range of the third lens's sag dimension, preventing difficulties in mold release due to excessively large or small sag dimensions, which could lead to unsatisfactory molded surfaces and compromised performance. By controlling this ratio, the molding and demolding difficulties of the third lens can be reduced, improving its molding stability.

[0062] In this embodiment, the radius of curvature R1 of the object-side surface of the first lens and the inner diameter d0s of the object-side surface of the lens barrel satisfy the following ratio: -1.77 ≤ R1 / d0s ≤ -0.68. Controlling the range of this ratio allows control over the wall thickness range of the lens barrel head, thereby controlling the assembly strength of the lens barrel head. This avoids the risk of lens barrel head deformation due to excessively thin wall thickness, which could lead to tilting during assembly. Conversely, excessively thick wall thickness can cause shrinkage and poor roundness in the inner diameter of the lens barrel, potentially resulting in loose assembly of the first lens. Controlling this ratio improves the assembly stability of the first lens.

[0063] In this embodiment, the central thickness CT2 of the second lens on the optical axis and the air gap T23 between the second and third lenses on the optical axis satisfy the following ratio: 3.72 ≤ CT2 / T23 ≤ 12.16. Controlling the ratio of the central thickness of the second lens on the optical axis to the air gap between the second and third lenses on the optical axis avoids excessive central thickness of the second lens and helps control the curvature of the image-side surface of the second lens. This improves the forming problems caused by excessive central thickness and significant surface curvature of the second lens, specifically the surface deviation from the design due to release vacuum, thus avoiding impacts on imaging performance and quality. Simultaneously, it also improves the appearance problems of the mechanism mapping caused by excessive curvature of the image-side surface of the second lens.

[0064] In this embodiment, the central thickness CT2 of the second lens on the optical axis, the outer diameter D2s of the object-side surface of the second spacer, and the radius of curvature R3 of the object-side surface of the second lens satisfy the following condition: 0.60mm ≤ R3×CT2 / D2s ≤ 2.59mm. Controlling this condition helps to avoid the second lens having an excessively thick edge structure, which can improve the problem of stray light becoming more pronounced due to the large reflective area caused by the excessively thick edge structure of the second lens. Simultaneously, it reduces the overall molding difficulty of the second lens, thereby increasing the optimization space for the surface shape of the second lens and improving imaging quality and functional stability.

[0065] In this embodiment, the radius of curvature R4 of the image-side surface of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object-side surface of the second spacer satisfy the condition: 2.12mm ≤ R4 × N2 / d2s ≤ 7.08mm. Controlling this condition helps to control the overall wall thickness of the second lens and the inner diameter of the second spacer; it avoids the increase in wall thickness caused by excessive refractive index or curvature of the second lens, further avoiding affecting molding filling and optical transmittance; it also avoids the risk of molding and debugging difficulties caused by excessive refractive index of the second lens, reduces the difficulty of process optimization, and is conducive to improving overall performance and quality.

[0066] In this embodiment, the radius of curvature R8 of the image-side surface of the fourth lens, 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 condition: 4.28 ≤ |R8 + R9| / d4m ≤ 5.52. By controlling the ratio of the absolute value of the sum of the radii of curvature of the image-side surface of the fourth lens and the radii 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 uniformity of the edge and center thickness of the fifth lens is controlled. This avoids the risk of weld lines appearing during the molding of the fifth lens due to excessively thin center thickness, which could lead to increased stray light from the weld lines. It also avoids the risk of assembly breakage due to excessive edge thickness of the fifth lens. By controlling this condition, the risk of stray light from weld lines and assembly abnormalities in the fifth lens can be effectively reduced, while ensuring the matching degree between the dimensions of the fourth spacer and the fifth lens, thus reducing the possibility of stray light generation.

[0067] In this embodiment, the effective focal length f6 of the sixth lens and its center thickness CT6 on the optical axis satisfy the following condition: -19.76 ≤ f6 / CT6 ≤ -16.10. By controlling the ratio of the effective focal length to the center thickness of the sixth lens, it is beneficial to control the range of the sixth lens's height and curvature. This avoids difficulties in mold release and abnormal appearances such as bonding lines during molding due to excessively large height or insufficient center thickness of the sixth lens. It also prevents increased difficulty in surface profile adjustment, ensuring that the molded surface profile of the sixth lens meets requirements and guaranteeing the overall stability of the optical imaging lens's performance. By controlling this condition, the risk of mold release difficulties for the sixth lens can be effectively reduced, and the molding stability of the sixth lens can be improved.

[0068] In this embodiment, the radius of curvature R12 of the image-side surface of the sixth lens and the inner diameter d6s of the object-side surface of the sixth spacer satisfy the following ratio: 0.62 ≤ R12 / d6s ≤ 1.38. By controlling the range of the ratio between the radius of curvature of the image-side surface of the sixth lens and the inner diameter of the object-side surface of the sixth spacer, the possibility of new stray light generated by the main rays outside the field of view hitting the edge structure of the seventh lens and the module position outside the image plane through the sixth lens can be reduced. At the same time, the amount of edge rays reflected from the object-side surface of the module's color filter to the image-side surface of the seventh lens and entering the sixth lens can also be reduced, avoiding the situation where the amount of light is too large and the energy is too strong, which would lead to an increase in stray light. This can effectively reduce the risk of stray light caused by light leakage reflection from the edge structure of the sixth lens and edge rays reflected from the object-side surface of the module's color filter to the image-side surface of the sixth lens.

[0069] In this embodiment, the air gap T67 between the sixth and seventh lenses on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy the following condition: 2.13 ≤ T67 / CT6 ≤ 3.45. By controlling the range of the ratio between the air gap between the sixth and seventh lenses on the optical axis and the center thickness of the sixth lens on the optical axis, it is beneficial to control the range of the center thickness of the sixth lens, avoid appearance abnormalities such as "air entrapment" and "bonding lines" caused by the sixth lens being too thin in the center, avoid the risk of reducing the molding and adjustment space, effectively reduce the difficulty of molding and adjustment, facilitate the optimization of the surface shape of the sixth lens, and thus ensure the improvement of the quality and performance of the optical imaging lens. Controlling this condition can effectively avoid the risk of molding and adjustment difficulties caused by the center thickness of the sixth lens being too thin, which is of great help to improve performance and stability.

[0070] In this embodiment, the maximum axial thickness CP1 of the first spacer, the distance EP01 between the object side of the lens barrel and the object side of the first spacer on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: 4.01 ≤ (EP01 + CP1) / CT1 ≤ 7.38. Controlling this condition allows for control over the thickness of the edge structure of the first lens and the object side structure of the lens barrel in contact with the first lens; avoiding the risk of obstructing the principal ray due to excessive lens barrel thickness, ensuring the stability of optical imaging and optical quality, and preventing significant structural mapping appearance problems and stray light problems caused by excessive edge thickness of the first lens. By controlling the center thickness of the first lens, the thickness-to-thickness ratio of the first lens is ensured, thereby balancing the overall structure of the first lens and preventing appearance abnormalities such as air entrapment during molding and filling due to an excessively large thickness-to-thickness ratio. Constraining this condition effectively constrains the thickness balance of the object side structure of the lens barrel and the edge structure of the first lens, which is beneficial for meeting the feasibility of appearance molding, improving the final image quality, and meeting the need for stray light reduction.

[0071] In this embodiment, the radius of curvature R5 of the object-side surface of the third lens, the outer diameter D2m of the image-side surface of the second spacer, and the inner diameter d2m of the image-side surface of the second spacer satisfy the following relationship: 1.09 ≤ R5 / (D2m-d2m) ≤ 3.72. By controlling the radius of curvature of the object-side surface of the third lens, it is beneficial to limit the curvature of the object-side surface of the third lens and to ensure the smoothness of the surface shape; at the same time, by constraining the ratio range of this radius of curvature to the difference between the outer diameter and the inner diameter of the image-side surface of the second spacer, it is beneficial to ensure that the radial width of the second spacer is within a reasonable range. On the one hand, this ensures that the contact area between the second spacer and the third lens is large enough to ensure stable assembly of the two in the lens barrel; on the other hand, it also avoids the problem of the second spacer blocking the imaging light.

[0072] In this embodiment, the air gap T34 between the third and fourth lenses on the optical axis, the maximum axial thickness CP4 of the fourth spacer, and the air gap T56 between the fifth and sixth lenses on the optical axis satisfy the following ratio: 0.38 ≤ (T34 + CP4) / T56 ≤ 3.10. By controlling the ratio range of the sum of the air gaps between the third and fourth lenses on the optical axis and the maximum axial thickness of the fourth spacer to the air gaps between the fifth and sixth lenses on the optical axis, it is beneficial to control the center and edge gaps between the third and fourth lenses within a reasonable range. Simultaneously, it can constrain the air gaps between the fifth and sixth lenses within a reasonable range, ensuring a smooth transition of light between the third, fourth, fifth, and sixth lenses, guaranteeing stable light transmission, and ensuring the reasonable size of the fourth spacer, avoiding the risk of reflection and scattering stray light due to excessive size.

[0073] In this embodiment, the first lens has negative optical power, and both its object-side and image-side surfaces are concave; the second lens has positive optical power, and both its object-side and image-side surfaces are convex; the fourth lens has positive optical power, and both its object-side and image-side surfaces are convex; the sixth lens has negative 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. 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 guarantee image quality.

[0074] In this embodiment, the third lens has positive optical power, and both its object-side and image-side surfaces are convex; the fifth lens also 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 guarantee image quality.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] In another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel, a lens group disposed in the lens barrel, and at least one spacer. The lens group consists of 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 at least one spacer includes a third spacer placed between the third and fourth lenses and in contact with the image side of the third lens, and a fourth spacer placed between the fourth and fifth lenses and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer on the optical axis of the optical imaging lens satisfy the following: 4.36≤f4 / EP34≤10.94. The radius of curvature R8 of 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: 4.28≤|R8+R9| / d4m≤5.52.

[0079] The optical imaging lens of this application consists of a lens barrel, seven lenses disposed within the lens barrel, and at least one spacer. By reasonably arranging the positions of the seven lenses and the third and fourth spacers, and setting 4.36≤f4 / EP34≤10.94, it can be seen that the distance between the third and fourth spacers is relatively small compared to the effective focal length of the fourth lens. In other words, the edge thickness of the fourth lens is relatively small compared to its effective focal length. This can easily lead to an unreasonable design of the radial dimension of the fourth spacer in contact with it. If the radial dimension of the fourth spacer is too large, it will restrict the passage path of edge imaging light. If the radial dimension of the fourth spacer is too small, it will be difficult to intercept edge stray light, increasing the generation of stray light. Therefore, this application constrains 4.28≤|R8+R9| / d4m≤5.52 to control the uniformity of the edge and center thickness of the fifth lens, avoiding the risk of weld lines appearing during the molding of the fifth lens due to excessively thin center thickness, which in turn increases the risk of stray light from the weld lines. At the same time, it also avoids the risk of assembly breakage caused by excessive edge thickness of the fifth lens. By controlling this condition, the risk of stray light from weld lines and assembly abnormalities of the fifth lens can be effectively reduced. On the other hand, it can also ensure the matching degree between the size of the fourth spacer and the fifth lens, reducing the possibility of stray light generation.

[0080] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0081] In another optional embodiment of this application, an optical imaging lens is also provided, including a lens barrel, a lens group disposed in the lens barrel, and at least one spacer. The lens group consists of 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 at least one spacer includes a third spacer placed between the third and fourth lenses and in contact with the image side of the third lens, and a fourth spacer placed between the fourth and fifth lenses and in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens and the distance EP34 between the image side of the third spacer and the object side of the fourth spacer on the optical axis of the optical imaging lens satisfy the following: 4.36≤f4 / EP34≤10.94. The radius of curvature R8 of the image side of the fourth lens, the maximum axial thickness CP4 of the fourth spacer, and the inner diameter d4s of the object side of the fourth spacer satisfy the following: -0.22mm≤R8×CP4 / d4s≤0.06mm.

[0082] The optical imaging lens of this application consists of a lens barrel, seven lenses disposed within the lens barrel, and at least one spacer. By reasonably arranging the positions of the seven lenses and the third and fourth spacers, and setting 4.36≤f4 / EP34≤10.94, it can be seen that the distance between the third and fourth spacers is relatively small compared to the effective focal length of the fourth lens. In other words, the edge thickness of the fourth lens is relatively small compared to its effective focal length. This can easily lead to an unreasonable design of the radial dimension of the fourth spacer in contact with it. If the radial dimension of the fourth spacer is too large, it will restrict the passage path of edge imaging light. If the radial dimension of the fourth spacer is too small, it will be difficult to intercept edge stray light, increasing the generation of stray light. Therefore, by constraining -0.22mm≤R8×CP4 / d4s≤0.06mm, this application can avoid the situation where the edge structure of the fourth lens is too thick, which can improve the problem that stray light becomes more obvious due to the large reflection area caused by the excessively thick edge structure of the fourth lens. At the same time, it reduces the overall molding difficulty of the fourth lens, thereby increasing the optimization space of the surface shape of the fourth lens and improving the imaging quality and functional stability.

[0083] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0084] Optionally, the aforementioned optical imaging lens may also include protective glass for protecting the photosensitive element located on the imaging surface.

[0085] 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.

[0086] 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, EP23, EP34, d2s, d4s, d6s, D2s, D4s, d2m, d4m, D2m, CP1, and CP4 to provide a clear and intuitive understanding of their meaning. To facilitate the description of the optical imaging lens and the specific lens shape, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0087] 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.

[0088] 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 radii of curvature, 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 spacer, and the seventh spacer are different.

[0089] 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.

[0090] Example 1

[0091] 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.

[0092] like Figures 2 to 4As 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 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 within the lens barrel P0. In this embodiment, a seventh spacer P7 is also provided on the image side of the seventh lens E7.

[0093] 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 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 seventh spacer P7 is in contact with the image-side S14 of the seventh lens.

[0094] 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.

[0095] like Figure 4 The diagram shows the structure of the optical imaging lens in Embodiments 1-3. The difference between this example and Embodiment 1-1 is that a fifth spacer P5 is provided between the fifth lens E5 and the sixth lens E6. In this case, the object-side and image-side of the fifth spacer P5 contact the image-side S10 of the fifth lens and the object-side S11 of the sixth lens, respectively. A sixth auxiliary spacer P6b is also provided on the image-side of the sixth spacer P6. In this case, the image-side of the sixth spacer P6 contacts the object-side of the sixth auxiliary spacer P6b, and the image-side of the sixth auxiliary spacer P6b contacts the object-side S13 of the seventh lens. The contact and abutment methods of the remaining spacers are the same as in Embodiment 1-1, and can be referred to the relevant descriptions in Embodiment 1-1, which will not be repeated here.

[0096] 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.

[0097] Table 2

[0098]

[0099]

[0100] 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.

[0101] In Embodiment 1, the effective focal length f1 of the first lens is -3.55mm, the effective focal length f2 of the second lens is 37.09mm, the effective focal length f3 of the third lens is 4.70mm, the effective focal length f4 of the fourth lens is 8.30mm, the effective focal length f5 of the fifth lens is 5.23mm, the effective focal length f6 of the sixth lens is -5.82mm, and the effective focal length f7 of the seventh lens is -12.86mm.

[0102] 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 side and image-side side of the filter, or the object-side side and image-side side of the protective glass. S17 (not shown in the figure) is the imaging plane.

[0103] Table 3

[0104]

[0105] 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:

[0106]

[0107] 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.

[0108] Table 4

[0109] S1 3.6615E-01 -4.8609E-02 5.7215E-03 -5.9646E-04 4.9941E-05 -2.4394E-06 4.7745E-08 0.0000E+00 0.0000E+00 S2 1.8576E-01 1.6649E-02 9.1075E-04 -2.1606E-05 -2.8499E-05 -2.6293E-05 3.3218E-06 0.0000E+00 0.0000E+00 S3 -9.7043E-02 5.3774E-03 -3.3567E-04 2.1822E-05 -9.1117E-07 1.9279E-08 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.1360E-04 -2.0839E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 4.7976E-02 -2.4943E-03 8.7526E-05 -1.7335E-06 1.8869E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 3.0327E-02 -1.6571E-03 1.5514E-04 -8.1663E-06 2.2176E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -2.1433E-02 6.0711E-05 -1.3405E-05 -3.7432E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -5.1984E-02 4.4869E-03 -3.1591E-04 4.6800E-05 -6.9841E-06 4.7907E-07 -1.1505E-08 0.0000E+00 0.0000E+00 S9 -5.7965E-04 -2.0097E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 2.2065E-03 4.7538E-04 4.6711E-05 4.2298E-06 3.7361E-07 3.4460E-08 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.2853E-01 1.5383E-02 -8.3092E-04 2.8198E-05 -5.3876E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 -1.7607E-01 2.1381E-02 -2.4278E-03 1.1473E-04 -5.3416E-06 -8.2127E-08 0.0000E+00 0.0000E+00 0.0000E+00 S13 -3.9526E-01 1.5756E-03 -5.7131E-03 -5.0641E-05 -1.1935E-04 7.0775E-05 -4.3167E-06 -1.5324E-07 -1.1565E-08 S14 -1.0617E+00 6.1956E-02 -2.2454E-02 2.7014E-03 -1.2368E-03 2.2919E-04 -1.7154E-04 -1.7373E-06 -2.6576E-08

[0110] 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.

[0111] according to Figures 5 to 7 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0112] Example 2

[0113] 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.

[0114] 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 seventh spacer P7 is also provided on the image side of the seventh lens E7.

[0115] 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 seventh spacer P7 is in contact with the image-side S14 of the seventh lens.

[0116] 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.

[0117] like Figure 10 The diagram shown is a structural schematic of the optical imaging lens of Embodiment 2-3. The difference between this example and Embodiment 2-1 is that a first auxiliary spacer P1b is also provided on the image side of the first spacer P1. In this case, the image side of the first spacer P1 contacts the object side of the first auxiliary spacer P1b, and the image side of the first auxiliary spacer P1b contacts the object side S3 of the second lens. The bearing and contact methods of the remaining spacers 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.

[0118] 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.

[0119] Table 5

[0120] EP01(mm) 2.600 1.791 2.038 EP23(mm) 0.720 0.901 0.913 EP34(mm) 0.823 0.792 0.856 CP1(mm) 0.030 0.811 0.030 CP4 (mm) 0.030 0.030 0.030 d2s(mm) 2.493 2.493 2.540 d2m(mm) 2.433 2.433 2.498 D2s(mm) 7.601 5.813 5.813 D2m(mm) 7.601 5.813 5.813 d4s(mm) 2.700 2.700 2.681 d4m(mm) 2.640 2.640 2.637 D4s(mm) 7.921 7.921 5.973 d6s(mm) 3.333 3.333 3.473 D0s(mm) 10.609 10.609 13.399 d0s(mm) 8.887 6.784 8.871

[0121] 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.

[0122] In Example 2, the effective focal length f1 of the first lens is -3.71mm, the effective focal length f2 of the second lens is 92.17mm, the effective focal length f3 of the third lens is 5.14mm, the effective focal length f4 of the fourth lens is 3.74mm, the effective focal length f5 of the fifth lens is 14.69mm, the effective focal length f6 of the sixth lens is -6.46mm, and the effective focal length f7 of the seventh lens is -10.82mm.

[0123] 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 side and image-side side of the filter, or the object-side side and image-side side of the protective glass. S17 (not shown in the figure) is the imaging plane.

[0124] Table 6

[0125]

[0126] Table 7 below lists 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 lens S1-S14 in Example 2. The surface shape of each aspherical lens is defined according to formula (1) in Example 1.

[0127] Table 7

[0128]

[0129]

[0130] 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 12The 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.

[0131] according to Figures 11 to 13 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0132] Example 3

[0133] 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.

[0134] like Figures 14 to 16 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, 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 within the lens barrel P0. In this embodiment, a seventh spacer P7 is also provided on the image side of the seventh lens E7.

[0135] like Figure 14 The diagram shows a schematic of the optical imaging lens in Embodiment 3-1. In this example, a first spacer P1 is also provided on the image side of the first lens E1. At this time, 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 seventh spacer P7 is in contact with the image-side S14 of the seventh lens.

[0136] like Figure 15The diagram shown is a structural schematic of the optical imaging lens of Embodiment 3-2. The difference between this example and Embodiment 3-1 is that the first spacer P1 is not provided on the image side of the first lens E1. In this case, the edge portion of the image side of the first lens contacts the edge portion of the object side of the second lens. The bearing and contact methods of the remaining spacers 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.

[0137] 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 3-2, and can be referred to the relevant description in Embodiment 3-2, which will not be repeated here.

[0138] 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.

[0139] Table 8

[0140] EP01(mm) 1.387 EP23(mm) 0.651 0.641 0.543 EP34(mm) 0.641 0.829 0.675 CP1(mm) 0.971 CP4 (mm) 0.022 0.030 0.030 d2s(mm) 2.390 2.390 2.464 d2m(mm) 2.330 2.330 2.404 D2s(mm) 6.883 7.347 5.518 D2m(mm) 6.883 7.347 5.518 d4s(mm) 2.506 2.506 2.575 d4m(mm) 2.461 2.461 2.530 D4s(mm) 7.203 5.949 5.949 d6s(mm) 5.610 2.945 3.189 D0s(mm) 8.655 8.310 12.862 d0s(mm) 5.870 6.875 8.310

[0141] 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.

[0142] In Embodiment 3, the effective focal length f1 of the first lens is -3.39mm, the effective focal length f2 of the second lens is 24.91mm, the effective focal length f3 of the third lens is 4.08mm, the effective focal length f4 of the fourth lens is 5.74mm, the effective focal length f5 of the fifth lens is 8.72mm, the effective focal length f6 of the sixth lens is -7.00mm, and the effective focal length f7 of the seventh lens is -9.92mm.

[0143] 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 side and image-side side of the filter, or the object-side side and image-side side of the protective glass. S17 (not shown in the figure) is the imaging plane.

[0144] Table 9

[0145]

[0146] 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.

[0147] Table 10

[0148] S1 4.2796E-02 -9.7867E-03 1.7773E-03 -2.5902E-04 2.3750E-05 -1.1315E-06 2.1283E-08 0.0000E+00 0.0000E+00 S2 2.7844E-02 2.4081E-03 7.2083E-03 -8.1224E-03 5.3752E-03 -2.1395E-03 5.7016E-04 -1.0761E-04 1.0253E-05 S3 -2.9059E-02 5.8130E-03 -6.4859E-04 3.8413E-05 -1.2526E-06 1.9164E-08 0.0000E+00 0.0000E+00 0.0000E+00 S4 -9.6915E-05 -5.0011E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 2.5535E-02 -6.7821E-03 5.0266E-05 1.4590E-04 -1.4838E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.6621E-02 -4.4005E-03 6.9663E-04 -6.1499E-05 2.6428E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -2.2936E-02 1.7035E-03 8.0142E-04 -2.2803E-04 2.4253E-05 -1.0615E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.5525E-02 2.8193E-03 -2.6042E-04 1.1836E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 2.8080E-02 -1.1275E-02 2.0914E-03 -2.0169E-04 9.2012E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 -4.7428E-02 1.5325E-02 -2.8420E-03 2.8276E-04 -1.4343E-05 2.9646E-07 0.0000E+00 0.0000E+00 0.0000E+00 S11 -1.0341E-01 6.6962E-02 -2.3075E-02 3.1264E-03 -5.8766E-04 3.1868E-04 -7.5702E-05 0.0000E+00 0.0000E+00 S12 -4.1563E-02 6.6461E-02 -2.9836E-02 7.3614E-03 -1.7520E-03 3.4540E-04 -2.8131E-05 0.0000E+00 0.0000E+00 S13 -6.3455E-02 1.2690E-02 -5.5400E-03 1.6650E-03 -1.3447E-04 -2.1900E-04 1.0499E-04 -2.1484E-05 1.8505E-06 S14 -5.8125E-02 1.5347E-02 -4.4602E-03 9.9647E-04 -1.5317E-04 1.3347E-05 -4.7613E-07 -3.0822E-09 -6.9133E-11

[0149] 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.

[0150] according to Figures 17 to 19 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0151] In summary, Examples 1 to 3 respectively satisfy the relationships shown in Table 11.

[0152] Table 11

[0153] f1 / (D0s-d0s) -0.89 -1.17 -1.51 -2.15 -0.97 -0.82 -1.22 -2.36 -0.74 (T34+CP4) / T56 3.10 3.10 3.10 1.81 1.81 1.81 0.38 0.41 0.41 f4 / EP34 8.74 9.09 10.94 4.54 4.72 4.36 8.95 6.92 8.50 f23 / EP23 5.08 5.37 5.24 7.83 6.26 6.18 6.67 6.77 7.99 R1 / d0s -0.93 -1.09 -1.31 -1.35 -1.77 -1.35 -0.97 -0.82 -0.68 CT2 / T23 12.16 12.16 12.16 3.72 3.72 3.72 9.95 9.95 9.95 R3×CT2 / D2s 2.59 2.59 2.59 0.60 0.78 0.78 1.34 1.26 1.68 R4×N2 / d2s 7.08 7.08 6.89 2.16 2.16 2.12 3.12 3.12 3.03 R5 / (D2m-d2m) 1.68 1.68 1.71 2.38 3.64 3.72 1.21 1.09 1.76 R7 / (D4s-d4s) 0.67 1.11 1.10 0.61 0.61 0.97 0.80 1.09 1.11 |R8+R9| / d4m 5.44 5.48 5.52 4.96 4.96 4.96 4.40 4.40 4.28 f6 / CT6 -16.10 -16.10 -16.10 -18.12 -18.12 -18.12 -19.76 -19.76 -19.76 R12 / d6s 0.62 0.64 0.62 1.22 1.22 1.17 0.72 1.38 1.27 T67 / CT6 3.45 3.45 3.45 2.13 2.13 2.13 2.69 2.69 2.69 (EP01+CP1) / CT1 4.01 4.01 4.02 7.38 7.30 5.80 6.75 R8×CP4 / d4s 0.06 0.06 0.06 -0.06 -0.06 -0.06 -0.16 -0.22 -0.22

[0154] Table 12 shows the effective focal length and other parameters of each lens in the optical imaging lenses of Examples 1 to 3.

[0155] Table 12

[0156]

[0157]

[0158] 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.

[0159] 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.

[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 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, a lens assembly disposed within the lens barrel, and at least one spacer. 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 first lens has negative optical power, and both its object-side and image-side surfaces are concave. The second lens has positive optical power, and both its object-side and image-side surfaces are convex. The third lens has positive optical power, and both its object-side and image-side surfaces are convex. The fourth lens has positive 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 negative 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 at least one spacer 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 effective focal length f4 of the fourth lens and the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer on the optical axis of the optical imaging lens satisfy the following: 4.36≤f4 / EP34≤10.94; the radius of curvature R7 of the object side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy the following: 0.61≤R7 / (D4s-d4s)≤1.11; the center thickness CT2 of the second lens on the optical axis and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following: 3.72≤CT2 / T23≤12.

16.

2. The optical imaging lens according to claim 1, characterized in that, The effective focal length f1 of the first lens, the outer diameter D0s of the object side of the lens barrel, and the inner diameter d0s of the object side of the lens barrel satisfy the following condition: -2.36≤f1 / (D0s-d0s)≤-0.

74.

3. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further 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 combined focal length f23 of the second lens and the third lens satisfies the following relationship between the image side of the second spacer and the object side of the third spacer on the optical axis: 5.08≤f23 / EP23≤7.

99.

4. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R1 of the object side surface of the first lens and the inner diameter d0s of the object side surface of the lens barrel satisfy the following condition: -1.77≤R1 / d0s≤-0.

68.

5. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further 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 central thickness CT2 of the second lens on the optical axis, the outer diameter D2s of the object side of the second spacer, and the radius of curvature R3 of the object side of the second lens satisfy the following: 0.60mm≤R3≤CT2 / D2s≤2.59mm.

6. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further 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 R4 of the image side of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object side of the second spacer satisfy the following: 2.12mm≤R4≤N2 / d2s≤7.08mm.

7. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R8 of 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 condition: 4.28≤|R8+R9| / d4m≤5.

52.

8. The optical imaging lens according to claim 1, characterized in that, The effective focal length f6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy the following condition: -19.76≤f6 / CT6≤-16.

10.

9. The optical imaging lens according to claim 1, characterized in that, The at least one spacer further 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 R12 of the image side of the sixth lens and the inner diameter d6s of the object side of the sixth spacer satisfy the following condition: 0.62≤R12 / d6s≤1.

38.

10. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The air gap T67 between the sixth lens and the seventh lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy the following condition: 2.13≤T67 / CT6≤3.

45.

11. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The at least one spacer further 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 maximum axial thickness CP1 of the first spacer, the distance EP01 between the object side of the lens barrel and the object side of the first spacer on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 4.01≤(EP01+CP1) / CT1≤7.

38.

12. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The at least one spacer further 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, the outer diameter D2m of the image side of the second spacer, and the inner diameter d2m of the image side of the second spacer satisfy the following: 1.09≤R5 / (D2m-d2m)≤3.

72.

13. The optical imaging lens according to any one of claims 1 to 9, characterized in that, The air gap T34 between the third and fourth lenses on the optical axis, the maximum axial thickness CP4 of the fourth spacer, and the air gap T56 between the fifth and sixth lenses on the optical axis satisfy the following condition: 0.38≤(T34+CP4) / T56≤3.10.

Images