Optical imaging lens

Abstract

The invention 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, and 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 the object side to the image side; f4 / EP34 is more than or equal to 4.36 and less than or equal to 10.94; r7 / (D4s-d4s) is greater than or equal to 0.61 and less than or equal to 1.11. The optical imaging lens solves the problem that stray light is increased due to the fact that the focal length and the edge size of a middle lens are controlled by a seven-piece optical imaging lens in the prior art, and the size of a spacer in contact with the seven-piece optical imaging lens is difficult to give consideration to the effects of edge imaging light passing and stray light interception.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging equipment, and in particular to an optical imaging lens. Background Art

[0002] In modern optical design, seven-element optical imaging lenses are widely used in mobile devices, surveillance cameras, automotive assisted driving, drone photography, and various portable electronic devices due to their high optical performance and compact design. However, while this lens structure provides excellent image quality, it faces many technical challenges.

[0003] Currently, the seven-element optical imaging lens in the existing technology controls the edge size and focal length of the middle lens to control the lens molding, appearance and assembly. However, this approach also brings a series of problems. First, the small edge size of the middle lens will limit the size of the spacer in contact with it, and thus limit the path of the edge imaging light, thereby affecting the overall field of view and angular resolution of the optical imaging lens. Secondly, the longer focal length makes the light beam path inside the optical imaging lens more complicated. If the size of the spacer in contact with it is unreasonable, it will be difficult to intercept stray light, which increases the probability of stray light generation. That is, non-imaging light reaches the imaging surface after reflection or refraction inside the optical imaging lens, causing glare, ghosting and other phenomena in the image, reducing image quality.

[0004] That is to say, the seven-element optical imaging lens in the prior art has the problem of controlling the focal length and edge size of the middle lens, which makes it difficult for the size of the spacer in contact with it to take into account both the passage of edge imaging light and the interception of stray light, thereby leading to an increase in stray light. Summary of the Invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem of the existing seven-element optical imaging lens in the art. The control of the focal length and edge size of the central lens makes it difficult to size the spacer in contact with it to take into account the functions of both passing the edge imaging light and intercepting stray light, thereby increasing 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, a lens group disposed in the lens barrel, and at least one spacer, wherein the lens group comprises seven lenses, which are, from object side to image side, 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 surface of the fourth lens is convex; the at least one spacer comprises a third spacer disposed between the third and fourth lenses and in contact with the image-side surface of the third lens, and a fourth spacer disposed between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens; an effective focal length f4 of the fourth lens and a 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 relationship: 4.36≤f4 / EP34≤10.94; and a curvature radius R7 of the object-side surface of the fourth lens, an outer diameter D4s of the object-side surface of the fourth spacer, and an inner diameter d4s of the object-side surface of the fourth spacer satisfy the following relationship: 0.61≤R7 / (D4s-d4s)≤1.11.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group arranged in the lens barrel, and at least one spacer, wherein the lens group consists of seven lenses, which are, from the object side to the image side, 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 comprises 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 effective focal length f4 of the fourth lens and the spacing distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer on the optical axis of the optical imaging lens satisfy the following relationship: 4.36≤f4 / EP34≤10.94; the curvature radius R8 of the image side surface of the fourth lens, the curvature radius 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 relationship: 4.28≤|R8+R9| / d4m≤5.52.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group arranged in the lens barrel, and at least one spacer, wherein the lens group consists of seven lenses, which are, from the object side to the image side, 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 comprises 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 effective focal length f4 of the fourth lens and the spacing distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer on the optical axis of the optical imaging lens satisfy the following relationship: 4.36≤f4 / EP34≤10.94; the curvature radius R8 of the image side surface of the fourth lens, the maximum axial thickness CP4 of the fourth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy the following relationship: -0.22 mm≤R8×CP4 / d4s≤0.06 mm.

[0009] Furthermore, the effective focal length f1 of the first lens, the outer diameter D0s of the object-side surface of the lens barrel, and the inner diameter d0s of the object-side surface 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 placed between the second lens and the third lens and in contact with the image side surface of the second lens, and the combined focal length f23 of the second lens and the third lens and the spacing distance EP23 from the image side surface of the second spacer to the object side surface of the third spacer on the optical axis satisfy: 5.08≤f23 / EP23≤7.99.

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

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

[0013] Furthermore, the 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 surface of the second lens, and the center 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 curvature radius R3 of the object side surface of the second lens satisfy: 0.60mm≤R3×CT2 / D2s≤2.59mm.

[0014] Furthermore, the 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 surface of the second lens, and the curvature radius 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: 2.12mm≤R4×N2 / d2s≤7.08mm.

[0015] Furthermore, a curvature radius R8 of the image-side surface of the fourth lens, a curvature radius R9 of the object-side surface of the fifth lens, and an inner diameter d4m of the image-side surface of the fourth spacer satisfy: 4.28≤|R8+R9| / d4m≤5.52.

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

[0017] Furthermore, the at least one spacer also includes a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and the curvature radius 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 relationship: 0.62≤R12 / d6s≤1.38.

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

[0019] Furthermore, the 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 surface of the first lens, and the maximum axial thickness CP1 of the first spacer, the spacing distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer on the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy: 4.01≤(EP01+CP1) / CT1≤7.38.

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

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

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

[0023] Furthermore, the third lens has positive refractive power, the object-side surface of the third lens is convex, and the image-side surface is convex; the fifth lens has positive refractive power, and the image-side surface of the fifth lens is convex.

[0024] Applying the technical solution of the present invention, the optical imaging lens of the present application comprises a lens barrel, seven lenses disposed in the lens barrel, and at least one spacer. By rationally 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 unreasonable design of the radial dimensions of the fourth spacer in contact with the fourth spacer. If the radial dimensions of the fourth spacer are too large, it will restrict the path of the edge imaging light. If the radial dimensions of the fourth spacer are too small, it will be difficult to intercept edge stray light, thereby increasing stray light. Therefore, the present application controls the ratio range of the radius of curvature of the object side surface of the fourth lens and the difference between the outer diameter and the inner diameter of the object side surface of the fourth spacer by constraining 0.61≤R7 / (D4s-d4s)≤1.11. This can effectively control the radial size of the fourth spacer within a reasonable range, avoiding the situation where the radial size is too large and affects the imaging of the main light path, and the radial size is too small and causes an increase in stray light, thereby ensuring imaging stability, avoiding the increase of stray light, and improving the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

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

[0027] Figure 2 A schematic structural diagram of an optical imaging lens according to embodiment 1-1 of the present invention is shown;

[0028] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0029] Figure 4 Schematic diagrams showing the structures of optical imaging lenses according to embodiments 1-3 of the present invention are shown;

[0030] Figures 5 to 7 axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging lens according to the first embodiment of the present invention are respectively shown;

[0031] Figure 8 2. A schematic structural diagram of an optical imaging lens according to embodiment 2-1 of the present invention is shown;

[0032] Figure 9 2. A schematic structural diagram of an optical imaging lens according to embodiment 2-2 of the present invention is shown;

[0033] Figure 10 A schematic structural diagram of an optical imaging lens according to Embodiment 2-3 of the present invention is shown;

[0034] Figures 11 to 13 axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging lens according to the second embodiment of the present invention are respectively shown;

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

[0036] Figure 15 Schematic diagram showing the structure of the optical imaging lens of Example 3-2 of the present invention;

[0037] Figure 16 Schematic diagram of the structure of the optical imaging lens of Example 3-3 of the present invention is shown;

[0038] Figures 17 to 19 axial chromatic aberration curve, astigmatism curve, and magnification chromatic aberration curve of the optical imaging lens according to the third embodiment of the present invention are respectively shown;

[0039] Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 、 Figure 24 and Figure 25 The following diagrams sequentially illustrate 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 for the optical imaging lens of Solution 1 of the present application when f4 / EP34=8.95 and R7 / (D4s-d4s)=0.80 are shown.

[0040] Figure 26 、 Figure 27 、 Figure 28The following diagrams illustrate the molding and packaging 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, respectively.

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

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

[0043] 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; 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 DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the 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 ordinary technicians in the technical field to which this application belongs.

[0046] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0047] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0048] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0049] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; for the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged 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. Hereinafter, the object-side surface of the lens refers to the side of the lens facing the object being photographed (not shown in the figure), and the image-side surface of the lens refers to the side of the lens facing the imaging plane. In the structural diagrams shown in this application, the left side is the object side, and the right side is the image side.

[0051] To address the problem in the prior art of seven-element optical imaging lenses that controlling the focal length and edge size of the central lens makes it difficult for the size of the spacer in contact with the central lens to balance the functions of passing edge imaging light and intercepting stray light, thereby leading to an increase in stray light, the present invention provides an optical imaging lens.

[0052] like Figures 1 to 30As shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group disposed in the lens barrel and at least one spacer, the lens group consisting of seven lenses, which are, from the object side to the image side, 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 surface of the fourth lens is convex; the at least one spacer 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 effective focal length f4 of the fourth lens and the spacing distance EP34 from the image-side surface of the third spacer to 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 curvature radius 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.

[0053] The optical imaging lens of the present application comprises a lens barrel, seven lenses disposed therein, and at least one spacer. By rationally 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 the fourth lens. If the radial dimension of the fourth spacer is too large, it will restrict the path of the edge imaging light. If the radial dimension of the fourth spacer is too small, it will be difficult to intercept the edge stray light, thereby increasing the stray light. Therefore, the present application controls the ratio range of the radius of curvature of the object side surface of the fourth lens and the difference between the outer diameter and the inner diameter of the object side surface of the fourth spacer by constraining 0.61≤R7 / (D4s-d4s)≤1.11. This can effectively control the radial size of the fourth spacer within a reasonable range, avoiding the situation where the radial size is too large and affects the imaging of the main light path, and the radial size is too small and causes an increase in stray light, thereby ensuring imaging stability, avoiding the increase of stray light, and improving the imaging quality of the optical imaging lens.

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

[0055] like Figures 20 to 30 As shown in the figure, when the optical imaging lens meets f4 / EP34=8.95 and R7 / (D4s-d4s)=0.80, the edge thickness of the fourth lens is smaller than its effective focal length, the edge thickness is more reasonable, and the appearance problems such as encapsulation are less. Moreover, by constraining R7, D4s, and d4s, the radial size of the fourth spacer is within a reasonable range, reducing the added stray light and performing better. When the optical imaging lens meets f4 / EP34=4.00 and R7 / (D4s-d4s)=0.58, the edge thickness of the fourth lens is too thick, which is prone to molding and filling difficulties, thus leading to Figure 26 The appearance of the package shown in the figure is abnormal. At the same time, the unreasonable radial size of the fourth spacer leads to an increase in stray light. Figure 28 Compared to Figure 23 When the optical imaging lens meets the requirements of 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 thick, which is prone to Figure 29 The weld line shown has an abnormal appearance. At the same time, the unreasonable radial dimension of the fourth spacer leads 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 is relatively reasonable and the radial size of the fourth spacer is relatively reasonable, and the stray light is small. Therefore, the present application, by constraining 4.36≤f4 / EP34≤10.94 and 0.61≤R7 / (D4s-d4s)≤1.11, on the basis of constraining the spacing distance from the third spacer to the fourth spacer to be smaller than the effective focal length of the fourth lens, controls the ratio range of the radius of curvature of the object side surface of the fourth lens to the difference between the outer diameter and the inner diameter of the object side surface of the fourth spacer, and can effectively control the radial size of the fourth spacer within a reasonable range, avoid the radial size being too large to affect the imaging of the main light path and the radial size being too small to cause an increase in stray light, thereby ensuring imaging stability, avoiding the increase of stray light, and improving the imaging quality of the optical imaging lens.

[0057] Table 1

[0058] Solution 1 of this application Comparative Example 1 Comparative Example 2 f4 / EP34 8.95 4.00 11.50 R7 / (D4s-d4s) 0.80 0.58 1.20

[0059] In this embodiment, the at least one spacer also includes a first spacer selectively placed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer placed between the second lens and the third lens and in contact with the image side surface of the second lens, a fifth spacer selectively placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, a sixth spacer selectively placed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer placed on the image side of the seventh lens and in contact with the image side surface 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 relationship: -2.36≤f1 / (D0s-d0s)≤-0.74. By controlling the difference between the outer diameter and the inner diameter of the object side of the lens barrel, the wall thickness of the lens barrel at the light entrance position is avoided from being too thin, which helps to increase the assembly strength of the head of the optical imaging lens and avoid the risk of assembly deformation. By controlling the effective focal length of the first lens, the field of view angle and edge structure position of the first lens are controlled. In turn, the increased stray light sensitivity caused by fill shrinkage at the light entrance position of the lens barrel is reduced. Through this conditional expression, the assembly accuracy of the optical imaging lens is effectively improved, the molding stability is ensured, 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 on the optical axis between the image side surface of the second spacer and the object side surface of the third spacer satisfy the following relationship: 5.08≤f23 / EP23≤7.99. Controlling the ratio of the combined focal length of the second and third lenses to the distance on the optical axis between the image side surface of the second spacer and the object side surface of the third spacer is used to control the sagittal height range of the third lens. This avoids the risk of difficulty in releasing the third lens from the mold due to an excessively large or small sagittal height, which could result in the molded surface of the third lens failing to meet requirements and thus affecting performance. Controlling this ratio can reduce the difficulty in releasing the third lens from the mold and improve the molding stability of the third lens.

[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 relationship: -1.77≤R1 / d0s≤-0.68. Controlling the ratio range of the radius of curvature of the object side surface of the first lens to the inner diameter of the object side surface of the lens barrel can control the thickness range of the lens barrel head, thereby controlling the assembly strength of the lens barrel head. This avoids the risk of deformation of the lens barrel head when the first lens is assembled to the lens barrel due to excessive thickness of the lens barrel head, thereby causing the first lens to tilt when assembled. It can also avoid the risk of poor roundness of the inner diameter of the lens barrel due to excessive thickness of the lens barrel head, thereby causing the first lens to loosen during assembly. By controlling this ratio, the assembly stability of the first lens can be improved.

[0063] In this embodiment, 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 relationship: 3.72≤CT2 / T23≤12.16. Controlling the ratio of the center thickness of the second lens on the optical axis to the air gap between the second and third lenses on the optical axis prevents excessive center thickness of the second lens and helps control the curvature of the image-side surface of the second lens. This improves molding issues caused by excessive center thickness of the second lens and significant surface inflection, specifically surface deviation from the design due to vacuum release, thereby preventing degradation in imaging performance and quality. Furthermore, it also improves the appearance of mechanical 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 equation: 0.60 mm ≤ R3 × CT2 / D2s ≤ 2.59 mm. Controlling this condition helps prevent excessively thick edge structures of the second lens, thereby alleviating the problem of significant stray light due to the large reflection area caused by such a thick edge structure. This also reduces the overall molding difficulty of the second lens, thereby increasing the scope for surface shape optimization 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 following equation: 2.12mm ≤ R4 × N2 / d2s ≤ 7.08mm. Controlling this conditional expression helps control the overall thickness of the second lens and the inner diameter of the second spacer. This avoids increased thickness due to an excessively high refractive index or curvature of the second lens, further minimizing the impact on molding, filling, and optical transmittance. It also avoids the risk of molding and debugging difficulties caused by an excessively high refractive index of the second lens, reducing the difficulty of process optimization and improving overall performance.

[0066] In this embodiment, the curvature radius R8 of the image-side surface of the fourth lens, the curvature radius 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 relationship: 4.28≤|R8+R9| / d4m≤5.52. By controlling the ratio of the absolute value of the sum of the curvature radii of the image-side surface of the fourth lens and the curvature radii of the object-side surface of the fifth lens to the inner diameter of the image-side surface of the fourth spacer, the thickness uniformity of the edge and center thickness of the fifth lens is controlled. This avoids the risk of weld marks during molding of the fifth lens due to excessively thin center thickness, which in turn increases the risk of weld mark stray light in the fifth lens. It also avoids the risk of assembly failure of the fifth lens due to excessive edge thickness. By controlling this conditional expression, the risk of weld mark stray light and assembly anomalies of the fifth lens can be effectively reduced, while ensuring the matching of the dimensions of the fourth spacer with the fifth lens, reducing the possibility of stray light.

[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 relationship: -19.76 ≤ f6 / CT6 ≤ -16.10. Controlling the ratio of the effective focal length of the sixth lens to its center thickness on the optical axis facilitates controlling the sagittal height range and curvature range of the sixth lens. This prevents mold release difficulties and appearance anomalies such as weld lines during molding and filling of the sixth lens due to excessive sagittal height and insufficient center thickness. This also reduces the difficulty of surface shaping, ensures that the molded surface of the sixth lens meets requirements, and ensures the overall performance stability of the optical imaging lens. By controlling this conditional expression, 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 relationship: 0.62 ≤ R12 / d6s ≤ 1.38. By controlling the ratio of the radius of curvature of the image-side surface of the sixth lens to the inner diameter of the object-side surface of the sixth spacer, the possibility of principal light outside the field of view passing through the sixth lens and striking the edge structure of the seventh lens and module positions outside the image plane, generating new stray light, can be reduced. This also reduces the amount of marginal light reflected from the object-side surface of the module's color filter onto the image-side surface of the seventh lens and entering the sixth lens, thus preventing the increase in stray light caused by excessive light and high energy. This effectively reduces the risk of stray light caused by light leakage reflection from the edge structure of the sixth lens and marginal light reflected from the object-side surface of the module's color filter onto the image side of the sixth lens.

[0069] In this embodiment, the air spacing 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 ratio of the air spacing between the sixth and seventh lenses on the optical axis to the center thickness of the sixth lens on the optical axis, the center thickness of the sixth lens can be controlled within a certain range. This avoids appearance anomalies such as "air entrapment" and "weld lines" caused by an excessively thin center thickness of the sixth lens during molding and filling, and reduces the risk of reduced molding and debugging space. This effectively reduces the difficulty of molding and debugging, facilitates optimization of the surface shape of the sixth lens, and thereby ensures improved quality and performance of the optical imaging lens. Controlling this condition effectively avoids the risk of difficulty in molding and debugging due to an excessively thin center thickness of the sixth lens, significantly contributing to improved performance and stability.

[0070] In this embodiment, the maximum axial thickness CP1 of the first spacer, the spacing distance EP01 from the object side of the lens barrel to 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 conditions: 4.01≤(EP01+CP1) / CT1≤7.38. By controlling this conditional expression, 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 can be controlled; the risk of blocking the edge principal light due to the excessive thickness of the lens barrel is avoided, the stability of optical imaging and optical quality is ensured, and at the same time, obvious structural mapping appearance problems and stray light problems caused by the excessive thickness of the edge of the first lens are avoided. By controlling the center thickness of the first lens, the thickness ratio of the first lens is ensured, and the overall structure of the first lens is balanced, avoiding the appearance abnormalities such as trapped air caused by the molding filling of the first lens due to the excessive thickness ratio. Constraining this conditional expression can effectively constrain the balance of the thickness of the object side structure of the lens barrel and the edge structure of the first lens, which is conducive to meeting the feasibility of appearance molding, improving the final imaging quality, and meeting the demand for stray light improvement.

[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. Controlling the radius of curvature of the object-side surface of the third lens helps limit the degree of curvature of the object-side surface of the third lens and ensures the flatness of the surface shape. Simultaneously, constraining the ratio of this radius of curvature to the difference between the outer and inner diameters of the image-side surface of the second spacer helps ensure that the radial width of the second spacer is within a reasonable range. This ensures that the contact area between the second spacer and the third lens is sufficiently large, ensuring their stable assembly in the lens barrel. It also prevents the second spacer from blocking imaging light.

[0072] In this embodiment, the air spacing T34 between the third and fourth lenses on the optical axis, the maximum axial thickness CP4 of the fourth spacer, and the air spacing T56 between the fifth and sixth lenses on the optical axis satisfy the following relationship: 0.38≤(T34+CP4) / T56≤3.10. By controlling the ratio of the sum of the air spacing between the third and fourth lenses on the optical axis and the maximum axial thickness of the fourth spacer to the air spacing between the fifth and sixth lenses on the optical axis, it is advantageous to control the center and edge spacing between the third and fourth lenses within a reasonable range, while also constraining the air spacing between the fifth and sixth lenses within a reasonable range. This ensures smooth transition of light between the third, fourth, fifth, and sixth lenses, ensuring smooth light transmission. Furthermore, the size of the fourth spacer can be appropriately dimensioned to avoid the risk of reflection or scattered stray light caused by oversizing.

[0073] In this embodiment, the first lens has negative power, with its object-side surface concave and its image-side surface concave; the second lens has positive power, with its object-side surface convex and its image-side surface concave; the fourth lens has positive power, with its object-side surface convex; the sixth lens has negative power, with its object-side surface convex and its image-side surface concave; and the seventh lens has negative power, with its object-side surface convex and its image-side surface concave. By rationally planning the power and surface shape of each lens, it is beneficial to regulate light flow, ensure smooth light transmission, eliminate aberrations, and guarantee image quality.

[0074] In this embodiment, the third lens has positive optical power, with both its object-side and image-side surfaces being convex. The fifth lens also has positive optical power, with its image-side surface being convex. By rationally planning the optical power and surface shape of each lens, light distribution can be regulated, ensuring smooth light transmission, eliminating aberrations, and guaranteeing image quality.

[0075] Optionally, the optical imaging lens in the embodiments of the present application can be simulated using software and / or tools such as ZEMAX and CODEV. During the simulation using such software and / or tools, the surface profile of each lens can be appropriately adjusted based on the surface profiles inherent in the software and / or tools used.

[0076] In this embodiment, each lens can be configured as a trimmed lens. The outer diameter surface of the trimmed lens has a trimmed structure and a non-trimmed structure, and the outer diameter of the trimmed structure is smaller than the outer diameter of the non-trimmed structure. The outer diameter of the trimmed lens generally refers to the outer diameter of the non-trimmed structure.

[0077] In this embodiment, each spacer can be configured as a trimming spacer. The outer annular surface of the trimming spacer has a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion is smaller than the outer diameter of the non-trimming portion. The outer diameter of the trimming spacer generally refers to the maximum outer diameter of the non-trimming portion.

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

[0079] The optical imaging lens of the present application comprises a lens barrel, seven lenses disposed therein, and at least one spacer. By rationally 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 the fourth lens. If the radial dimension of the fourth spacer is too large, it will restrict the path of the edge imaging light. If the radial dimension of the fourth spacer is too small, it will be difficult to intercept edge stray light, thereby increasing the generation of stray light. Therefore, by constraining 4.28≤|R8+R9| / d4m≤5.52, the present application achieves the purpose of controlling the uniformity of the edge thickness and center thickness of the fifth lens, thereby avoiding the risk of a weld mark appearing during the molding of the fifth lens due to an excessively thin center thickness of the fifth lens, which in turn increases the risk of stray light from the weld mark of the fifth lens. It also avoids the risk of assembly rupture of the fifth lens due to excessive edge thickness. By controlling this conditional expression, the risk of stray light from the weld mark of the fifth lens and assembly abnormalities can be effectively reduced. Furthermore, the size of the fourth spacer can be ensured to match the fifth lens, thereby reducing the possibility of stray light.

[0080] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0081] In addition, in another optional embodiment of the present application, an optical imaging lens is also provided, including a lens barrel and a lens group arranged in the lens barrel and at least one spacer, the lens group consisting of seven lenses, and the seven lenses are, from the object side to the image side, 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 lens and the fourth lens and in contact with the image side surface of the third lens, and a fourth spacer placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; the effective focal length f4 of the fourth lens and the spacing distance EP34 from the image side surface of the third spacer to 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 curvature radius R8 of the image side surface of the fourth lens, the maximum axial thickness CP4 of the fourth spacer and the inner diameter d4s of the object side surface of the fourth spacer satisfy the following: -0.22mm≤R8×CP4 / d4s≤0.06mm.

[0082] The optical imaging lens of the present application comprises a lens barrel, seven lenses disposed therein, and at least one spacer. By rationally 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 the fourth lens. If the radial dimension of the fourth spacer is too large, it will restrict the path of the edge imaging light. If the radial dimension of the fourth spacer is too small, it will be difficult to intercept edge stray light, thereby increasing the generation of stray light. Therefore, by constraining -0.22mm≤R8×CP4 / d4s≤0.06mm, the present application can avoid the situation where the edge structure of the fourth lens is too thick. This can also improve the problem of stray light becoming more obvious due to the large reflection area caused by the thick edge structure of the fourth lens. It can also simultaneously reduce the overall molding difficulty of the fourth lens, thereby increasing the space for optimizing the surface shape of the fourth lens, and improving imaging quality and functional stability.

[0083] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

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

[0085] The optical imaging lens in this application may utilize multiple lenses, such as the seven lenses described above. In this application, at least one of the lens surfaces is an aspheric surface. Aspheric lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspheric lenses have a better curvature radius characteristic, with the advantages of improving distortion and astigmatism. The use of aspheric lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0086] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as EP01, EP23, EP34, d2s, d4s, d6s, D2s, D4s, d2m, d4m, D2m, CP1, and CP4 are labeled to provide a clear and intuitive understanding of their meaning. To facilitate the description of optical imaging lenses and specific lens surface shapes, these parameters will not be reflected in the accompanying drawings when describing specific embodiments.

[0087] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0088] It should be noted that in the following Example 1, there are three examples: Example 1-1, Example 1-2, and Example 1-3; in Example 2, there are three examples: Example 2-1, Example 2-2, and Example 2-3; and in Example 3, there are three examples: Example 3-1, Example 3-2, and Example 3-3. While the parameters such as the radius of curvature, center thickness, and spacing between lenses, as well as the higher-order coefficients, of the optical imaging lens for the three examples in the same embodiment are the same for the first through seventh lenses, the same parameters as for the thickness, inner diameter, and outer diameter of the lens barrel and the first through seventh spacers, are different.

[0089] It should be noted that any one of the following examples 1 to 3 is applicable to all implementation methods of the present application.

[0090] Example 1

[0091] like Figures 2 to 7 As shown, the optical imaging lens of embodiment 1 is described. Figure 2 1-1 shows a schematic structural diagram of the optical imaging lens of Example 1-1. Figure 3 Schematic diagram of the structure of the optical imaging lens of Example 1-2 is shown. Figure 4 Schematic diagrams of the structures of the optical imaging lenses of Examples 1-3 are shown.

[0092] like Figures 2 to 4As shown, the optical imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis in the lens barrel P0, 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. In this embodiment, a seventh spacer P7 is also provided on the image side of the seventh lens E7.

[0093] like Figure 2 , which is a schematic structural diagram of the optical imaging lens of Example 1-1. In this example, the object-side surface and image-side surface of the first spacer P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side surface and image-side surface of the second spacer P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side surface and image-side surface of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side surface and image-side surface of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side surface and image-side surface of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface of the seventh spacer P7 is in contact with the image-side surface S14 of the seventh lens.

[0094] like Figure 3 FIG2 is a schematic structural diagram of the optical imaging lens of Example 1-2. The supporting and abutting manner of each spacer is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to and will not be repeated here.

[0095] like Figure 4 , which is a schematic structural diagram of the optical imaging lens of Example 1-3. The difference between this example and Example 1-1 is that a fifth spacer P5 is provided between the fifth lens E5 and the sixth lens E6. At this time, the object side surface and image side surface of the fifth spacer P5 are in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively. A sixth auxiliary spacer P6b is also provided on the image side of the sixth spacer P6. At this time, the image side surface of the sixth spacer P6 is in contact with the object side surface of the sixth auxiliary spacer P6b, and the image side surface of the sixth auxiliary spacer P6b is in contact with the object side surface S13 of the seventh lens. The supporting and abutting manner of the remaining spacers is the same as that of Example 1-1. Please refer to the relevant description in Example 1-1 and will not be repeated here.

[0096] In summary, the structural parameters of the optical imaging lens of Example 1 in Examples 1-1, 1-2, and 1-3 are shown in Table 2.

[0097] Table 2

[0098]

[0099]

[0100] In Example 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 Example 1, the effective focal length f1 of the first lens is -3.55 mm, the effective focal length f2 of the second lens is 37.09 mm, the effective focal length f3 of the third lens is 4.70 mm, the effective focal length f4 of the fourth lens is 8.30 mm, the effective focal length f5 of the fifth lens is 5.23 mm, the effective focal length f6 of the sixth lens is -5.82 mm, and the effective focal length f7 of the seventh lens is -12.86 mm.

[0102] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, where the units for the radius of curvature and thickness / distance are all in millimeters (mm). In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S15 and S16 (not shown) can represent the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S17 (not shown) represents the imaging surface.

[0103] Table 3

[0104]

[0105] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0106]

[0107] Where x is the distance from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric 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; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 4 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-S14 in Example 1.

[0108] Table 4

[0109] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 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 axial chromatic aberration curve of the optical imaging lens of Example 1 is shown, which indicates the deviation 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 Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The chromatic aberration curve of the optical imaging lens of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0111] according to Figures 5 to 7 It can be seen that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0112] Example 2

[0113] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-1. Figure 9 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-2. Figure 10 A schematic structural diagram of the optical imaging lens of Example 2-3 is shown.

[0114] like Figures 8 to 10 As shown, the optical imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis in the lens barrel P0, 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. In this embodiment, a seventh spacer P7 is further provided on the image side of the seventh lens E7.

[0115] like Figure 8, which is a schematic structural diagram of the optical imaging lens of Example 2-1. In this example, the object-side and image-side surfaces of the first spacer P1 are in contact with the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer P2 are in contact with the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer P3 are in contact with the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer P5 are in contact with the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens and the object-side surface S13 of the seventh lens, respectively. The object-side surface of the seventh spacer P7 is in contact with the image-side surface S14 of the seventh lens.

[0116] like Figure 9 FIG2 is a schematic diagram of the structure of the optical imaging lens of Example 2-2. The supporting and abutting manner of each spacer is the same as that of Example 2-1, and the relevant description in Example 2-1 can be referred to and will not be repeated here.

[0117] like Figure 10 FIG2 is a schematic diagram of the structure of the optical imaging lens of Example 2-3. This example differs from Example 2-1 in that a first auxiliary spacer P1b is further provided on the image side of the first spacer P1. In this case, the image side surface of the first spacer P1 contacts the object side surface of the first auxiliary spacer P1b, which in turn contacts the object side surface S3 of the second lens. The abutment and contact arrangement of the remaining spacers is the same as in Example 2-1, and reference may be made to the relevant description in Example 2-1, which will not be repeated here.

[0118] In summary, the structural parameters of the optical imaging lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 5.

[0119] Table 5

[0120] Parameters / Example 2-1 2-2 2-3 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 Example 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 -3.71 mm, the effective focal length f2 of the second lens is 92.17 mm, the effective focal length f3 of the third lens is 5.14 mm, the effective focal length f4 of the fourth lens is 3.74 mm, the effective focal length f5 of the fifth lens is 14.69 mm, the effective focal length f6 of the sixth lens is -6.46 mm, and the effective focal length f7 of the seventh lens is -10.82 mm.

[0123] Table 6 shows the basic structural parameters of the optical imaging lens of Example 2, where the units for the radius of curvature and thickness / distance are all in millimeters (mm). In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S15 and S16 (not shown) can represent the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S17 (not shown) represents the imaging surface.

[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 of the aspheric mirror surfaces S1-S14 in Example 2. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0127] Table 7

[0128]

[0129]

[0130] Figure 11 The axial chromatic aberration curve of the optical imaging lens of Example 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 Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 13 The chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0131] according to Figures 11 to 13 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0132] Example 3

[0133] like Figures 14 to 19 As shown, the optical imaging lens of Example 3 is described. Figure 14 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-1. Figure 15 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-2. Figure 16 A schematic structural diagram of the optical imaging lens of Example 3-3 is shown.

[0134] like Figures 14 to 16 As shown, the optical imaging lens includes a lens barrel P0 and, arranged in order from the object side to the image side along the optical axis in the lens barrel P0, 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. In this embodiment, a seventh spacer P7 is also provided on the image side of the seventh lens E7.

[0135] like Figure 14 , which is a schematic structural diagram of the optical imaging lens system of Example 3-1. In this example, a first spacer P1 is further provided on the image side of the first lens element E1. The object-side and image-side surfaces of the first spacer P1 are in contact with the image-side surface S2 of the first lens element and the object-side surface S3 of the second lens element, respectively. The object-side and image-side surfaces of the second spacer P2 are in contact with the image-side surface S4 of the second lens element and the object-side surface S5 of the third lens element, respectively. The object-side and image-side surfaces of the third spacer P3 are in contact with the image-side surface S6 of the third lens element and the object-side surface S7 of the fourth lens element, respectively. The object-side and image-side surfaces of the fourth spacer P4 are in contact with the image-side surface S8 of the fourth lens element and the object-side surface S9 of the fifth lens element, respectively. The object-side and image-side surfaces of the fifth spacer P5 are in contact with the image-side surface S10 of the fifth lens element and the object-side surface S11 of the sixth lens element, respectively. The object-side and image-side surfaces of the sixth spacer P6 are in contact with the image-side surface S12 of the sixth lens element and the object-side surface S13 of the seventh lens element, respectively. The object-side surface of the seventh spacer P7 is in contact with the image-side surface S14 of the seventh lens element.

[0136] like Figure 15Figure 3-2 is a schematic diagram of the optical imaging lens structure of Example 3-2. This example differs from Example 3-1 in that the first spacer P1 is not provided on the image side of the first lens element E1. Instead, the edge of the image-side surface of the first lens element contacts the edge of the object-side surface of the second lens element. The abutment and contact mechanism of the remaining spacers is the same as that of Example 3-1. Please refer to the relevant description of Example 3-1 and will not be repeated here.

[0137] like Figure 16 FIG3 is a schematic diagram of the structure of the optical imaging lens of Example 3-3. The supporting and abutting manner of each spacer is the same as that of Example 3-2. Please refer to the relevant description of Example 3-2 and will not be repeated here.

[0138] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 8.

[0139] Table 8

[0140] Parameters / Example 3-1 3-2 3-3 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 Example 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 Example 3, the effective focal length f1 of the first lens is -3.39 mm, the effective focal length f2 of the second lens is 24.91 mm, the effective focal length f3 of the third lens is 4.08 mm, the effective focal length f4 of the fourth lens is 5.74 mm, the effective focal length f5 of the fifth lens is 8.72 mm, the effective focal length f6 of the sixth lens is -7.00 mm, and the effective focal length f7 of the seventh lens is -9.92 mm.

[0143] Table 9 shows the basic structural parameters of the optical imaging lens of Example 3, where the units for the radius of curvature and thickness / distance are all in millimeters (mm). In the table below, OBJ (not shown) is the object distance. STO (not shown) is the aperture stop, located between the second lens element E2 and the third lens element E3. S15 and S16 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S17 (not shown) is the imaging surface.

[0144] Table 9

[0145]

[0146] Table 10 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspheric mirror surfaces S1-S14 in Example 3. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0147] Table 10

[0148] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 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 axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates 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 Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 19 The chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0150] according to Figures 17 to 19 It can be seen that the optical imaging lens provided 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] Conditional formula / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 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 parameters such as the effective focal length of each lens of the optical imaging lens of Examples 1 to 3.

[0155] Table 12

[0156]

[0157]

[0158] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone 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 only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0160] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0161] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0162] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An optical imaging lens, characterized in that: comprising a lens barrel, a lens group disposed in the lens barrel, and at least one spacer, The lens group is composed of seven lenses, and the seven lenses are, from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens; the fourth lens has positive refractive power, and the object side surface of the fourth lens is convex; The at least one spacer 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 effective focal length f4 of the fourth lens and the spacing distance EP34 from the image side surface of the third spacer to 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 curvature radius 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.

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

74.

3. The optical imaging lens according to claim 1, wherein: 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 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: 5.08≤f23 / EP23≤7.

99.

4. The optical imaging lens according to claim 1, wherein: The curvature radius 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: -1.77≤R1 / d0s≤-0.

68.

5. The optical imaging lens according to claim 1, wherein: A center thickness CT2 of the second lens on the optical axis and an air interval T23 between the second lens and the third lens on the optical axis satisfy the following: 3.72≤CT2 / T23≤12.

16.

6. The optical imaging lens according to claim 1, wherein: 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 surface of the second spacer, and the curvature radius R3 of the object-side surface of the second lens satisfy the following relationship: 0.60 mm ≤ R3×CT2 / D2s ≤ 2.59 mm.

7. The optical imaging lens according to claim 1, wherein: 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 curvature radius 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 following: 2.12 mm ≤ R4×N2 / d2s ≤ 7.08 mm.

8. The optical imaging lens according to claim 1, wherein: A curvature radius R8 of the image-side surface of the fourth lens, a curvature radius R9 of the object-side surface of the fifth lens, and an inner diameter d4m of the image-side surface of the fourth spacer satisfy the following relationship: 4.28≤|R8+R9| / d4m≤5.

52.

9. The optical imaging lens according to claim 1, wherein: An effective focal length f6 of the sixth lens and a center thickness CT6 of the sixth lens on the optical axis satisfy the following ratio: -19.76≤f6 / CT6≤-16.

10.

10. The optical imaging lens according to claim 1, wherein: 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, A curvature radius R12 of the image-side surface of the sixth lens and an inner diameter d6s of the object-side surface of the sixth spacer satisfy the following: 0.62≤R12 / d6s≤1.38.

Images