Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing element group, the lens group and the spacing element group are arranged in the lens barrel, the lens group is composed of eight lenses, and the eight lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object side to the image side; eP12 / CT2 is greater than or equal to 2.82 and less than or equal to 3.75; r3 / D2s is greater than or equal to 1.73 and less than or equal to 2.51. The optical imaging lens solves the problem that in the prior art, an eight-piece optical imaging lens restrains the size of the front-end lens to meet the assembling precision, and consequently light passes through the front-end lens to generate serious stray light.

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] With the continuous development of portable electronic devices, major manufacturers have higher and higher requirements for the imaging of optical imaging lenses used in them. Eight-element optical imaging lenses are used in various electronic devices because they can meet users' imaging needs, such as in the photography systems of mobile devices such as smartphones and tablets. In order to reduce the difficulty of assembly, ensure assembly accuracy, and meet imaging requirements, the design of eight-element optical imaging lenses faces many challenges.

[0003] At present, in order to ensure assembly accuracy and reduce assembly difficulty, eight-element optical imaging lenses usually need to constrain the size of the front lens, especially the thickness of the front lens, so as to reduce assembly errors and reduce assembly difficulty. However, in this case, it is easy to make the shape of the front lens unreasonable, resulting in serious stray light when light passes through the front lens. This stray light not only reduces the clarity and color accuracy of the image, but also easily forms ghost images under certain conditions, seriously interfering with the imaging effect and affecting the final imaging quality of the optical imaging lens.

[0004] That is to say, the eight-piece optical imaging lens in the prior art has the problem of constraining the size of the front lens to meet the assembly accuracy, which leads to the problem of serious stray light generated when light passes through the front lens. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the size of the front lens is constrained in the prior art to meet the assembly accuracy, thereby causing serious stray light to be generated when light passes through the front lens.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group consists of eight lenses, and the eight 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, a seventh lens and an eighth lens in order; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens; wherein a spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship with a center thickness CT2 of the second lens on the optical axis: 2.82≤EP12 / CT2≤3.75; and a curvature radius R3 of the object side surface of the second lens and an outer diameter D2s of the object side surface of the second spacer element satisfy the following relationship: 1.73≤R3 / D2s≤2.51.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, wherein the lens group is composed of eight lenses, and the eight 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, a seventh lens and an eighth lens in order; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens; wherein a spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship with a center thickness CT2 of the second lens on the optical axis: 2.82≤EP12 / CT2≤3.75; and a curvature radius R4 of the image side surface of the second lens, an outer diameter D2s of the object side surface of the second spacer element and an outer diameter D1s of the object side surface of the first spacer element satisfy the following relationship: -0.07≤R4×(D2s-D1s)≤1.27.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group and a spacer element group arranged in the lens barrel, wherein the lens group is composed of eight lenses, and the eight 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, a seventh lens and an eighth lens in order from the object side to the image side; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens; wherein a spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy the following: 2.82≤EP12 / CT2≤3.75; a spacing distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacer element on the optical axis, an air spacing T12 between the first lens and the second lens on the optical axis and a maximum axial thickness CP2 of the second spacer element satisfy the following: 3.64≤EP01 / (T12+CP2)≤4.91.

[0009] Furthermore, a curvature radius R2 of the image side surface of the first lens, an outer diameter D1s of the object side surface of the first spacing element, and an inner diameter d1s of the object side surface of the first spacing element satisfy: 6.07≤R2 / (D1s-d1s)≤12.11.

[0010] Further, the central thickness CT3 of the third lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacing element satisfy: 6.86≤CT3 / (T23+CP2)≤7.63.

[0011] Furthermore, the spacer element group also includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum axial thickness CP3 of the third spacer element, and the spacing distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis satisfy: 0.84≤(T34+CP3) / EP23≤1.76.

[0012] Furthermore, the spacer element group also includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacer element and the inner diameter d3s of the object side surface of the third spacer element satisfy: 4.49≤R6 / (D3s-d3s)≤13.31.

[0013] Furthermore, the spacer element group also includes a third spacer element 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 element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. The spacing distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the following: 1.52≤EP34 / CT4≤3.94.

[0014] Furthermore, the spacer element group also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and the air gap T45 between the fourth lens and the fifth lens on the optical axis and the maximum axial thickness CP4 of the fourth spacer element satisfy: 1.96≤T45 / CP4≤2.82.

[0015] Furthermore, the spacer element group also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer element and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -3.34≤R8 / (D4s-d4s)≤-2.81.

[0016] Furthermore, the spacer element group also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis and the maximum axial thickness CP5 of the fifth spacer element satisfy: 2.29≤T56 / CP5≤2.85.

[0017] Furthermore, the spacer element group also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens. The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the spacing distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element on the optical axis satisfy: 11.06≤f5 / (CT5+EP45)≤12.63.

[0018] Furthermore, the spacer element group also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and the curvature radius R10 of the image side surface of the fifth lens and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 5.48≤R10 / d5s≤5.76.

[0019] Further, the spacer element group also includes a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens. The center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the spacing distance EP56 from the image side surface of the fifth spacer element to the object side surface of the sixth spacer element on the optical axis satisfy: 1.67≤(CT6+T67) / EP56≤2.69.

[0020] Furthermore, the spacer element group also includes a sixth spacer element 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 element placed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens. The center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, and the spacing distance EP67 from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element on the optical axis satisfy the following: 0.94≤(CT7+CT8) / EP67≤1.45.

[0021] Furthermore, the spacer element group also includes a sixth spacer element 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 R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer element and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 1.28≤R13 / (D6m-d6m)≤1.63.

[0022] Furthermore, the spacer element group also includes a seventh spacer element placed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens, and the inner diameter d7s of the object side surface of the seventh spacer element and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1.36≤d7s / R14≤1.71.

[0023] Furthermore, the spacing distance EP01 on the optical axis from the object side end face of the lens barrel to the object side face of the first spacing element, the air spacing T12 on the optical axis between the first lens and the second lens and the maximum axial thickness CP1 of the first spacing element satisfy: 3.64≤EP01 / (T12+CP1)≤4.91.

[0024] Furthermore, the first lens has positive focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has negative focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the seventh lens has positive focal power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; the eighth lens has negative focal power, the object side surface of the eighth lens is convex, and the image side surface of the eighth lens is concave.

[0025] Furthermore, the third lens has positive focal power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the fourth lens has negative focal power, the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex; the fifth lens has positive focal power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; the sixth lens has positive focal power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave.

[0026] By applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel, eight lenses arranged in the lens barrel, and a plurality of spacer elements. By reasonably arranging the positions of the eight lenses, the first spacer element, and the second spacer element, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that during the assembly process, the relative positions between the first spacer element, the second spacer element, and the second lens are kept within a reasonable range, and at the same time, the center thickness of the second lens at the front end on the optical axis and the edge thickness of the second lens are controlled, which helps to reduce assembly errors, avoids the assembly difficulties caused by excessive crowding between the second lens, the first spacer element, and the second spacer element, reduces the assembly difficulty of the optical imaging lens, and improves the assembly stability. However, in this case, it is easy to make the shape of the second lens at the front end of the optical imaging lens unreasonable, thereby causing serious stray light to be generated when the light passes through the second lens. The stray light not only reduces the clarity and color accuracy of the imaging, but also easily forms ghost images under certain conditions, seriously interfering with the imaging effect and affecting the final imaging quality of the optical imaging lens. Therefore, the present application can control the curvature shape of the object side surface of the second lens by constraining 1.73≤R3 / D2s≤2.51, thereby controlling the degree of deflection of light by the second lens, thereby ensuring the transmission path of the light when passing through the second lens, and at the same time constraining the outer diameter of the object side surface of the second spacer element, so that the second spacer element can intercept and absorb stray light, reduce the reflection of stray light inside the optical imaging lens, thereby achieving the purpose of reducing stray light, and then improving the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

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

[0030] Figure 3A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0031] Figures 4 to 7 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens according to the first embodiment of the present invention are respectively shown;

[0032] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 2-1 of the present invention is shown;

[0033] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0034] Figures 10 to 13 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the second embodiment of the present invention are respectively shown;

[0035] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0036] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0037] Figures 16 to 19 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the third embodiment of the present invention are respectively shown;

[0038] Fig. 20 A schematic structural diagram of an optical imaging lens according to Embodiment 4-1 of the present invention is shown;

[0039] Fig.21 A schematic structural diagram of an optical imaging lens according to Embodiment 4-2 of the present invention is shown;

[0040] Figure 22 to Figure 25 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the optical imaging lens of the fourth embodiment of the present invention are respectively shown;

[0041] Fig.26 The stray light energy distribution diagram is shown when the optical imaging lens of solution 1 of the present invention satisfies EP12 / CT2=3.14 and R3 / D2s=2.37;

[0042] Fig. 27 The stray light energy distribution diagram of the optical imaging lens of Comparative Example 1 when EP12 / CT2=3.14 and R3 / D2s=1.65 is shown;

[0043] Fig.28The stray light energy distribution diagram of the optical imaging lens of Comparative Example 2 is shown when EP12 / CT2=3.14 and R3 / D2s=2.57.

[0044] The above drawings include the following reference numerals:

[0045] P0, lens barrel; E1, first lens; S1, object side surface of first lens; S2, image side surface of first lens; E2, second lens; S3, object side surface of second lens; S4, image side surface of second lens; E3, third lens; S5, object side surface of third lens; S6, image side surface of third lens; E4, fourth lens; S7, object side surface of fourth lens; S8, image side surface of fourth lens; E5, fifth lens; S9, object side surface of fifth lens; S10, image side surface of fifth lens; E6, sixth lens; S 11, 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; E8, eighth lens; S15, object-side surface of the eighth lens; S16, image-side surface of the eighth lens; P1, first spacer; P2, second spacer; P3, third spacer; P3b, third auxiliary spacer; P4, fourth spacer; P5, fifth spacer; P6, sixth spacer; P7, seventh spacer. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0047] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0048] 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 directions; 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-mentioned directional words are not used to limit the present invention.

[0049] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0050] In the 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 shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0051] 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 type in the paraxial area can be based on the judgment method of the general 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 concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In the present application, the left side is the object side and the right side is the image side.

[0052] In order to solve the problem that the size of the front lens of the eight-piece optical imaging lens in the prior art is constrained to meet the assembly accuracy, thereby causing serious stray light to be generated when the light passes through the front lens, the present invention provides an optical imaging lens.

[0053] like Figures 1 to 26 As shown, in an optional embodiment of the present application, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens group consisting of eight lenses, and the eight 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, a seventh lens and an eighth lens; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens; wherein, a spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship with a center thickness CT2 of the second lens on the optical axis: 2.82≤EP12 / CT2≤3.75; a curvature radius R3 of the object side surface of the second lens and an outer diameter D2s of the object side surface of the second spacer element satisfy the following relationship: 1.73≤R3 / D2s≤2.51.

[0054] The optical imaging lens of the present application is composed of a lens barrel, eight lenses arranged in the lens barrel, and a plurality of spacer elements. By reasonably arranging the positions of the eight lenses, the first spacer element, and the second spacer element, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that during the assembly process, the relative positions between the first spacer element, the second spacer element, and the second lens are kept within a reasonable range, and at the same time, the center thickness of the second lens at the front end on the optical axis and the edge thickness of the second lens are controlled, which helps to reduce assembly errors, avoids the assembly difficulties caused by the overcrowding between the second lens, the first spacer element, and the second spacer element, reduces the assembly difficulty of the optical imaging lens, and improves the assembly stability. However, in this case, it is easy to make the shape of the second lens at the front end of the optical imaging lens unreasonable, thereby causing serious stray light when the light passes through the second lens. The stray light not only reduces the clarity and color accuracy of the imaging, but also easily forms ghost images under certain conditions, seriously interfering with the imaging effect and affecting the final imaging quality of the optical imaging lens. Therefore, the present application can control the curvature shape of the object side surface of the second lens by constraining 1.73≤R3 / D2s≤2.51, thereby controlling the degree of deflection of light by the second lens, thereby ensuring the transmission path of the light when passing through the second lens, and at the same time constraining the outer diameter of the object side surface of the second spacer element, so that the second spacer element can intercept and absorb stray light, reduce the reflection of stray light inside the optical imaging lens, thereby achieving the purpose of reducing stray light, and then improving the imaging quality of the optical imaging lens.

[0055] In addition, refer to the following table 1, Figure 26 to Figure 28 As shown, under the premise that the optical imaging lens satisfies 2.82≤EP12 / CT2≤3.75, for example, EP12 / CT2=3.14, Fig.26 The stray light energy distribution diagram when the optical imaging lens of solution 1 of the present invention satisfies R3 / D2s=2.37 is shown; Fig. 27 The stray light energy distribution diagram when the optical imaging lens of Comparative Example 1 satisfies R3 / D2s=1.65 is shown; Fig.28 The stray light energy distribution diagram when the optical imaging lens of Comparative Example 2 satisfies R3 / D2s=2.57 is shown.

[0056] Depend on Figure 26 to Figure 28 As shown in FIG. 1 , when the optical imaging lens satisfies R3 / D2s=2.37, the peak intensity of the stray light energy on the imaging surface of the optical imaging lens is 8.9E-7lm / mm 2 , the stray light energy is low, and the overall performance is better. When the optical imaging lens meets R3 / D2s=1.65, D2s is small, the curvature radius of the object side of the second lens is small, the deflection angle of the light is reduced, and stray light is easily generated. The peak intensity of the stray light energy on the imaging surface of the optical imaging lens is 1.2E-6lm / mm2 , the stray light energy is strong and the overall performance is poor. When the optical imaging lens meets R3 / D2s=2.57, R3 is reduced, and D2s is large. The stray light path is easily reflected to the edge of the image plane, which easily leads to high stray light energy. The peak intensity of the stray light energy on the imaging surface of the optical imaging lens is 1.4E-6lm / mm 2 , the stray light energy is high, and the overall performance is poor. It can be seen that when 2.82≤EP12 / CT2≤3.75 is satisfied and R3 / D2s is in the range of 1.73 to 2.51, the sizes of R3 and D2s are more reasonable, the stray light energy is lower, and the overall performance is optimal. Therefore, by constraining 2.82≤EP12 / CT2≤3.75 and 1.73≤R3 / D2s≤2.51, the present application can control the curvature shape of the object side of the second lens, thereby controlling the degree of deflection of the light by the second lens, thereby ensuring the transmission path of the light when passing through the second lens, and at the same time constraining the outer diameter of the object side of the second spacer element, so that the second spacer element can intercept and absorb stray light, reduce the reflection of stray light inside the optical imaging lens, and achieve the purpose of reducing stray light, thereby improving the imaging quality of the optical imaging lens.

[0057] Table 1

[0058] Solution 1 of the present invention Comparative Example 1 Comparative Example 2 EP12 / CT2 3.14 3.14 3.14 R3 / D2s 2.37 1.65 2.57

[0059] In this embodiment, the spacer element group also includes a third spacer element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, a sixth spacer element 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 element placed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens.

[0060] In this embodiment, the curvature radius R2 of the image side surface of the first lens, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1s of the object side surface of the first spacer element satisfy: 6.07≤R2 / (D1s-d1s)≤12.11. By controlling this conditional expression, the proportional relationship between the curvature radius of the image side surface of the first lens and the inner and outer diameter difference of the object side surface of the first spacer element can be controlled, which helps the light to pass through the first lens more smoothly, reduces the stray light caused by the refraction and reflection of the light, and thus improves the purity of the imaging of the optical imaging lens. If R2 / (D1s-d1s) is less than 6.07, R2 is too small, the first lens has insufficient ability to deflect light, which will cause the effective focal length of the optical imaging lens to become larger, which is not conducive to the miniaturization of the optical imaging lens; if R2 / (D1s-d1s) is greater than 12.11, the inner and outer diameter difference of the object side surface of the first spacer element is too small, resulting in the first spacer element's ability to block stray light becoming weak, affecting the imaging quality of the optical imaging lens.

[0061] In this embodiment, the relationship between the center thickness CT3 of the third lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the maximum axial thickness CP2 of the second spacing element satisfies: 6.86≤CT3 / (T23+CP2)≤7.63. By controlling this conditional expression, the relationship between the center thickness of the third lens on the optical axis, the air interval between the second lens and the third lens on the optical axis, and the maximum axial thickness of the second spacing element can be adjusted, which helps to enhance the structural stability of the optical imaging lens, simplify the manufacturing and assembly process of the optical imaging lens, and also helps to reduce production costs, ensure production efficiency, and improve the consistency and reliability of the optical imaging lens.

[0062] In this embodiment, the air gap T34 between the third lens and the fourth lens on the optical axis, the maximum axial thickness CP3 of the third spacer element, and the spacing distance EP23 from the image side of the second spacer element to the object side of the third spacer element on the optical axis satisfy the following conditions: 0.84≤(T34+CP3) / EP23≤1.76. By controlling this conditional expression, the air gap between the third lens and the fourth lens on the optical axis, the maximum axial thickness of the third spacer element, and the spacing distance from the image side of the second spacer element to the object side of the third spacer element on the optical axis can be adjusted, which helps to control the relative position between the third lens, the second spacer element and the third spacer element during the assembly process, avoid assembly errors caused by improper spacing between the third lens, the second spacer element and the third spacer element, and make the assembly process more orderly and controllable. In addition, the assembler can more accurately adjust the spacing distance between the third lens and the fourth lens on the optical axis, reduce unnecessary adjustment and inspection steps for the assembler, thereby simplifying the assembly process and improving the production efficiency of the optical imaging lens.

[0063] In this embodiment, the curvature radius R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacing element, and the inner diameter d3s of the object side surface of the third spacing element satisfy: 4.49≤R6 / (D3s-d3s)≤13.31. By controlling this conditional expression, the ratio of the curvature radius of the image side surface of the third lens to the inner and outer diameter difference of the object side surface of the third spacing element can be adjusted to reduce the stray light generated inside the optical imaging lens, thereby reducing the formation of the ghost image light path and weakening the propagation of the ghost image light path, enriching the details and layering of the imaging, and thus improving the imaging quality of the optical imaging lens. If R6 / (D3s-d3s) is less than 4.49, the inner diameter of the third spacer is too small, and the third spacer will hinder the normal passage of effective light, resulting in lower illumination of the optical imaging lens; if R6 / (D3s-d3s) is greater than 13.29, the difference between the inner and outer diameters of the object side of the third spacer is too small, which weakens the control ability of the third spacer on stray light, resulting in more stray light in the optical imaging lens and reduced imaging quality.

[0064] In this embodiment, the spacing distance EP34 on the optical axis from the image side surface of the third spacing element to the object side surface of the fourth spacing element and the center thickness CT4 of the fourth lens on the optical axis satisfy: 1.52≤EP34 / CT4≤3.94. By controlling this conditional expression, the ratio between the spacing distance on the optical axis from the image side surface of the third spacing element to the object side surface of the fourth spacing element and the center thickness of the fourth lens on the optical axis can be controlled, so that the size matching of the third spacing element, the fourth spacing element and the fourth lens is more reasonable, thereby reducing the axial length and volume of the optical imaging lens, which helps to achieve a compact design of the optical imaging lens. In addition, the constraint above can also maximize the use of the internal space of the optical imaging lens, avoid space waste, and make the volume of the optical imaging lens more compact and lightweight while maintaining high performance, and the assembly is more stable.

[0065] In this embodiment, the air gap T45 between the fourth lens and the fifth lens on the optical axis and the maximum axial thickness CP4 of the fourth spacing element satisfy: 1.96≤T45 / CP4≤2.82. By controlling this conditional expression, the ratio between the air gap between the fourth lens and the fifth lens on the optical axis and the maximum axial thickness of the fourth spacing element can be constrained, which helps to more accurately control the relative positions of the fourth lens, the fifth lens and the fourth spacing element during the assembly process of the optical imaging lens, ensuring that the optical imaging lens can be assembled with high precision. In addition, constraining the above expression also makes it easier for operators to calibrate and adjust the optical imaging lens after assembly, making it easier to realize the automated assembly of the optical imaging lens, which helps to improve the production efficiency and consistency of the optical imaging lens.

[0066] In this embodiment, the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -3.34≤R8 / (D4s-d4s)≤-2.81. By controlling this conditional expression, the ratio between the curvature radius of the image side surface of the fourth lens and the difference between the inner and outer diameters of the object side surface of the fourth spacer element can be controlled, which not only ensures that the effective light can pass through the fourth lens normally, but also allows the fourth spacer element to block the stray light path caused by refraction or reflection of light. If R8 / (D4s-d4s) is greater than -2.81, the fourth spacer element is likely to block the imaging light, thereby affecting the amount of light passing; if R8 / (D4s-d4s) is less than -3.34, the effect of the fourth spacer element in blocking stray light is weakened, the imaging quality is deteriorated, and the assembly stability of the optical imaging lens is also affected.

[0067] In this embodiment, the air spacing T56 between the fifth lens and the sixth lens on the optical axis and the maximum axial thickness CP5 of the fifth spacing element, which weakens the effect of the fourth spacing element on blocking stray light and deteriorates the imaging quality, satisfy the following: 2.29≤T56 / CP5≤2.85. By controlling this conditional expression, the ratio of the air spacing between the fifth lens and the sixth lens on the optical axis to the maximum axial thickness of the fifth spacing element can be constrained to be reasonable, which helps the assembler to more quickly determine and adjust the on-axis spacing between the fifth lens and the sixth lens, avoids the assembler from performing too much trial and error and fine-tuning, and reduces the risk of collision or scratching of the fifth lens and the sixth lens due to improper on-axis spacing between the fifth lens and the sixth lens. The above constraint not only reduces the time consumption during the assembly process, but also improves the work efficiency of the assembler, so that the optical imaging lens can enter the subsequent testing and quality control stage more quickly.

[0068] In this embodiment, the effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the spacing distance EP45 between the image side surface of the fourth spacing element and the object side surface of the fifth spacing element on the optical axis satisfy: 11.06≤f5 / (CT5+EP45)≤12.63. By controlling this conditional expression, the relationship between the effective focal length of the fifth lens, the center thickness of the fifth lens on the optical axis, and the spacing distance between the image side surface of the fourth spacing element and the object side surface of the fifth spacing element on the optical axis can be accurately controlled, so that the thickness distribution of the fifth lens is more uniform, effectively reducing the stress concentration problem caused by the uneven thickness of the fifth lens, thereby facilitating the improvement of the stability of the fifth lens. In addition, by reasonably constraining the above expression, the relative positions of the fifth lens, the fourth spacing element, and the fifth spacing element of the optical imaging lens are optimized, thereby significantly improving the assembly stability and imaging performance of the optical imaging lens.

[0069] In this embodiment, the curvature radius R10 of the image side surface of the fifth lens and the inner diameter d5s of the object side surface of the fifth spacing element satisfy: 5.48≤R10 / d5s≤5.76. By controlling this conditional expression, the ratio between the curvature radius of the image side surface of the fifth lens and the inner diameter of the object side surface of the fifth spacing element can be controlled, thereby optimizing the transmission path of light in the optical imaging lens, reducing unnecessary stray light reflection and scattering, thereby reducing the impact of stray light and ghost images on imaging quality, and enhancing the adaptability of the optical imaging lens to complex imaging environments.

[0070] In this embodiment, the center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the spacing distance EP56 from the image side surface of the fifth spacing element to the object side surface of the sixth spacing element on the optical axis satisfy the following relationship: 1.67≤(CT6+T67) / EP56≤2.69. By controlling this conditional expression, the relationship between the center thickness of the sixth lens on the optical axis, the air gap between the sixth lens and the seventh lens on the optical axis, and the spacing distance from the image side surface of the fifth spacing element to the object side surface of the sixth spacing element on the optical axis can be constrained, which can ensure the compactness of the internal structure of the optical imaging lens, help reduce the axial length of the optical imaging lens, improve the portability of the optical imaging lens, and avoid the problem of reduced imaging quality due to excessive compression of the internal structure of the optical imaging lens.

[0071] In this embodiment, the center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, and the spacing distance EP67 from the image side surface of the sixth spacing element to the object side surface of the seventh spacing element on the optical axis satisfy the following relationship: 0.94≤(CT7+CT8) / EP67≤1.45. By controlling this conditional expression, the relationship between the center thickness of the seventh lens on the optical axis, the center thickness of the eighth lens on the optical axis, and the spacing distance from the image side surface of the sixth spacing element to the object side surface of the seventh spacing element on the optical axis can be constrained, and the edge thickness of the seventh lens and the center thickness of the seventh lens and the eighth lens can be controlled within a reasonable range, which is convenient for the assembly work of the assembler, and ensures that the seventh lens, the eighth lens, the sixth spacing element, and the seventh spacing element of the optical imaging lens can be closely matched during the assembly process, thereby reducing the assembly error caused by size mismatch.

[0072] In this embodiment, the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 1.28≤R13 / (D6m-d6m)≤1.63. By controlling this conditional expression, the ratio of the curvature radius of the object side surface of the seventh lens to the inner and outer diameter difference of the image side surface of the sixth spacer element can be controlled, and the size of the sixth spacer element can be accurately controlled. While ensuring the normal passage of light, the sixth spacer element can also block the stray light path caused by refraction or reflection of light. If R13 / (D6m-d6m) is less than 1.28, (D6m-d6m) is too large, and the sixth spacer element will block the normal passage of effective light, thereby reducing the illumination of the optical imaging lens; if R13 / (D6m-d6m) is greater than 1.63, R8 is too large, and the central light and the edge light cannot converge together on the imaging surface, resulting in blurred imaging.

[0073] In this embodiment, the inner diameter d7s of the object side surface of the seventh spacer element and the curvature radius R14 of the image side surface of the seventh lens satisfy: 1.36≤d7s / R14≤1.71. By controlling this conditional expression, the ratio of the inner diameter of the object side surface of the seventh spacer element to the curvature radius of the image side surface of the seventh lens can be controlled, which helps to reduce multiple reflections of light inside the optical imaging lens, thereby reducing the generation of stray light and ghost images and improving the purity of imaging. In addition, under the premise of ensuring the performance of the optical imaging lens, the constraint of the above formula provides a certain flexibility for the dimensional tolerance in the manufacturing process, reducing the demand for processing accuracy of the optical imaging lens.

[0074] In this embodiment, the spacing distance EP01 on the optical axis from the object side end face of the lens barrel to the object side face of the first spacing element, the air spacing T12 on the optical axis between the first lens and the second lens, and the maximum axial thickness CP1 of the first spacing element satisfy: 3.64≤EP01 / (T12+CP1)≤4.91. By controlling this conditional expression, the relationship between the spacing distance on the optical axis from the object side end face of the lens barrel to the object side face of the first spacing element, the air spacing on the optical axis between the first lens and the second lens, and the maximum axial thickness of the first spacing element can be controlled, thereby optimizing the assembly gap between the object side end face of the lens barrel, the first lens, and the first spacing element, helping to reduce the degradation of imaging quality caused by assembly errors, avoiding excessive interference and loss of light during the transmission process between the first lens and the second lens, thereby maintaining a high imaging quality and improving the overall quality and reliability of the optical imaging lens.

[0075] In this embodiment, the first lens has positive focal power, the object side of the first lens is convex, and the image side of the first lens is concave; the second lens has negative focal power, the object side of the second lens is convex, and the image side of the second lens is concave; the seventh lens has positive focal power, the object side of the seventh lens is convex, and the image side of the seventh lens is concave; the eighth lens has negative focal power, the object side of the eighth lens is convex, and the image side of the eighth lens is concave; the third lens has positive focal power, the object side of the third lens is convex, and the image side of the third lens is concave; the fourth lens has negative focal power, the object side of the fourth lens is concave, and the image side of the fourth lens is convex; the fifth lens has positive focal power, the object side of the fifth lens is convex, and the image side of the fifth lens is concave; the sixth lens has positive focal power, the object side of the sixth lens is convex, and the image side of the sixth lens is concave. By rationally planning the focal power and surface shape of each lens, it is beneficial to regulate the light trend, ensure the stability of light transmission, eliminate aberrations, and ensure imaging quality.

[0076] Optionally, the optical imaging lens in the embodiments of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. In the process of simulation using the above software and / or tools, the surface profile of each lens can be simulated and appropriately adjusted according to the surface profile provided by the software and / or tool used.

[0077] In this embodiment, each lens can be selected 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 usually refers to the outer diameter of the non-trimmed structure.

[0078] In this embodiment, each spacer element can be selected as a trimming spacer element. The outer annular surface of the trimming spacer element 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 element usually refers to the maximum outer diameter of the non-trimming portion.

[0079] In addition, in another optional embodiment of the present application, an optical imaging lens is provided, comprising a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens group consisting of eight lenses, and the eight lenses are, from the object side to the image side, in order: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the spacer element group comprises a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens; wherein a spacing distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis of the optical imaging lens satisfies the following relationship with a center thickness CT2 of the second lens on the optical axis: 2.82≤EP12 / CT2≤3.75; a curvature radius R4 of the image side surface of the second lens, an outer diameter D2s of the object side surface of the second spacer element and an outer diameter D1s of the object side surface of the first spacer element satisfy the following relationship: -0.07≤R4×(D2s-D1s)≤1.27.

[0080] The optical imaging lens of the present application is composed of a lens barrel, eight lenses arranged in the lens barrel, and a plurality of spacer elements. By reasonably arranging the positions of the eight lenses, the first spacer element, and the second spacer element, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that during the assembly process, the relative positions between the first spacer element, the second spacer element, and the second lens are kept within a reasonable range, and at the same time, the center thickness of the second lens at the front end on the optical axis and the edge thickness of the second lens are controlled, which helps to reduce assembly errors, avoids the assembly difficulties caused by the overcrowding between the second lens, the first spacer element, and the second spacer element, reduces the assembly difficulty of the optical imaging lens, and improves the assembly stability. However, in this case, it is easy to make the shape of the second lens at the front end of the optical imaging lens unreasonable, thereby causing serious stray light when the light passes through the second lens. The stray light not only reduces the clarity and color accuracy of the imaging, but also easily forms ghost images under certain conditions, seriously interfering with the imaging effect and affecting the final imaging quality of the optical imaging lens. Therefore, the present application can control the curvature of the image side surface of the second lens by constraining -0.07≤R4×(D2s-D1s)≤1.27, thereby controlling the degree of deflection of the light by the second lens, ensuring that the transmission path of the light is appropriate when passing through the second lens, and at the same time constraining the outer diameter of the object side surface of the first spacer element and the second spacer element, so that the first spacer element and the second spacer element intercept and absorb stray light, reduce the scattering or reflection of stray light inside the optical imaging lens, thereby achieving the purpose of reducing stray light and improving the imaging quality of the optical imaging lens.

[0081] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0082] 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 and a spacer element group arranged in the lens barrel, the lens group is composed of eight lenses, and the eight 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, a seventh lens and an eighth lens in order from the object side to the image side; the spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface of the first lens and a spacer element placed between the second lens and the third lens and in contact with the image side surface of the second lens a second spacing element; wherein, a spacing distance EP12 from the image side surface of the first spacing element to the object side surface of the second spacing element on the optical axis of the optical imaging lens and a center thickness CT2 of the second lens on the optical axis satisfy: 2.82≤EP12 / CT2≤3.75; a spacing distance EP01 from the object side end surface of the lens barrel to the object side surface of the first spacing element on the optical axis, an air spacing T12 between the first lens and the second lens on the optical axis and a maximum axial thickness CP2 of the second spacing element satisfy: 3.64≤EP01 / (T12+CP2)≤4.91.

[0083] The optical imaging lens of the present application is composed of a lens barrel, eight lenses arranged in the lens barrel, and a plurality of spacer elements. By reasonably arranging the positions of the eight lenses, the first spacer element, and the second spacer element, and setting 2.82≤EP12 / CT2≤3.75, it can be ensured that during the assembly process, the relative positions between the first spacer element, the second spacer element, and the second lens are kept within a reasonable range, and at the same time, the center thickness of the second lens at the front end on the optical axis and the edge thickness of the second lens are controlled, which helps to reduce assembly errors, avoids the assembly difficulties caused by the overcrowding between the second lens, the first spacer element, and the second spacer element, reduces the assembly difficulty of the optical imaging lens, and improves the assembly stability. However, in this case, it is easy to make the shape of the second lens at the front end of the optical imaging lens unreasonable, thereby causing serious stray light when the light passes through the second lens. The stray light not only reduces the clarity and color accuracy of the imaging, but also easily forms ghost images under certain conditions, seriously interfering with the imaging effect and affecting the final imaging quality of the optical imaging lens. Therefore, the present application can limit the spacing distance between the object side end face of the lens barrel and the object side face of the first spacing element on the optical axis, the relationship between the air spacing between the first lens and the second lens on the optical axis and the maximum axial thickness of the second spacing element by constraining 3.64≤EP01 / (T12+CP2)≤4.91, optimize the structure and position of the second lens, ensure the rationality of the layout of the front-end structure, ensure that the second lens can effectively control the deflection and transmission path of light, and then help reduce the stray light formed at the second lens, avoid the generation of excessive stray light and ghost images, thereby improving the clarity and color accuracy of the imaging.

[0084] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0085] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0086] The optical imaging lens in the present application may use multiple lenses, such as the eight lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0087] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0088] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d1s, D1s, D2s, d3s, D3s, d4s, D4s, d5s, d6m, D6m, d7s, CP1, CP2, CP3, CP4, CP5, EP01, EP12, EP23, EP34, EP45, EP56 and EP67 are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0089] 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.

[0090] It should be noted that in the following embodiment 1, there are two examples of embodiment 1-1 and embodiment 1-2, in embodiment 2, there are two examples of embodiment 2-1 and embodiment 2-2, in embodiment 3, there are two examples of embodiment 3-1 and embodiment 3-2, and in embodiment 4, there are two examples of embodiment 4-1 and embodiment 4-2. In the two examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distance between lenses of the optical imaging lens are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel and the first to seventh spacing elements are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0091] It should be noted that any one of the following embodiments 1 to 4 is applicable to all implementation methods of the present application.

[0092] Embodiment 1

[0093] like Figures 2 to 7 As shown, the optical imaging lens of the first embodiment is described. Figure 2 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 3 A schematic structural diagram of the optical imaging lens of Embodiment 1-2 is shown.

[0094] like Figures 2 to 3 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, a seventh spacing element P7, and an eighth lens E8 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis. In this embodiment, a pressure ring is further arranged on the image side of the eighth lens E8.

[0095] like Figure 2, which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the object side surface and image side surface of the first spacer element 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 element 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 element 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 element 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 fifth spacer element 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 surface and image side surface of the sixth spacer element 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 and image side surface of the seventh spacer element P7 are in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The object side surface of the pressure ring contacts the image side surface S16 of the eighth lens.

[0096] like Figure 3 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-2. In this example, a third auxiliary spacer element P3b is further provided on the image side of the third spacer element P3. At this time, the image side surface of the third spacer element P3 contacts the object side surface of the third auxiliary spacer element P3b, and the image side surface of the third auxiliary spacer element P3b contacts the object side surface S7 of the fourth lens. In addition, the abutment manner of the remaining spacer elements is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and no further description is given here.

[0097] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1 and Example 1-2 are shown in Table 2.

[0098] Table 2

[0099] Parameters / Examples 1-1 1-2 d1s(mm) 2.993 2.993 D1s(mm) 4.234 5.195 D2s(mm) 4.230 5.543 d3s(mm) 3.570 3.568 D3s(mm) 4.439 5.991 d4s(mm) 3.725 3.725 D4s(mm) 6.690 6.750 d5s(mm) 4.540 4.540 d6m(mm) 5.387 5.387 D6m(mm) 7.687 7.747 d7s(mm) 6.014 6.014 CP1(mm) 0.022 0.022 CP2(mm) 0.022 0.022 CP3(mm) 0.022 0.409 CP4(mm) 0.022 0.022 CP5(mm) 0.022 0.022 EP01(mm) 1.177 1.275 EP12(mm) 0.665 0.567 EP23(mm) 0.602 0.608 EP34(mm) 0.891 0.409 EP45(mm) 0.621 0.498 EP56(mm) 0.550 0.620 EP67(mm) 0.840 0.550

[0100] In Embodiment 1, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The object side surface S15 of the eighth lens is a convex surface, and the image side surface S16 of the eighth lens is a concave surface.

[0101] In Example 1, the effective focal length f1 of the first lens is 7.76 mm, the effective focal length f2 of the second lens is -8.31 mm, the effective focal length f3 of the third lens is 6.67 mm, the effective focal length f4 of the fourth lens is -22.96 mm, the effective focal length f5 of the fifth lens is 11.63 mm, the effective focal length f6 of the sixth lens is 18.77 mm, the effective focal length f7 of the seventh lens is 12.05 mm, and the effective focal length f8 of the eighth lens is -4.60 mm.

[0102] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0103] Table 3

[0104]

[0105] In the first embodiment, the object-side surface and the image-side surface of the first lens E1 to the eighth lens E8 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0106]

[0107] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 3; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S16 in Example 1.

[0108] Table 4

[0109]

[0110]

[0111] Figure 4 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 5 The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 6 The distortion curve of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 7 The magnification chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0112] according to Figures 4 to 7 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0113] Embodiment 2

[0114] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-1. Fig. 9 A schematic structural diagram of the optical imaging lens of Example 2-2 is shown.

[0115] like Figures 8 to 9 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, a seventh spacing element P7, and an eighth lens E8 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis. In this embodiment, a pressure ring is further arranged on the image side of the eighth lens E8.

[0116] like Figure 8 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, the object side surface and image side surface of the first spacer element 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 element 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 element 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 element 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 fifth spacer element 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 surface and image side surface of the sixth spacer element 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 and image side surface of the seventh spacer element P7 are in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The object side surface of the pressure ring contacts the image side surface S16 of the eighth lens.

[0117] like Fig. 9, which is a schematic diagram of the structure of the optical imaging lens of Example 2-2. In this example, a third auxiliary spacer element P3b is also provided on the image side of the third spacer element P3. At this time, the image side surface of the third spacer element P3 contacts the object side surface of the third auxiliary spacer element P3b, and the image side surface of the third auxiliary spacer element P3b contacts the object side surface S7 of the fourth lens. In addition, the abutment method of the remaining spacer elements is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and no further description is given here.

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

[0119] Table 5

[0120]

[0121]

[0122] In the second embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The object side surface S15 of the eighth lens is a convex surface, and the image side surface S16 of the eighth lens is a concave surface.

[0123] In Example 2, the effective focal length f1 of the first lens is 7.86 mm, the effective focal length f2 of the second lens is -8.32 mm, the effective focal length f3 of the third lens is 6.65 mm, the effective focal length f4 of the fourth lens is -21.85 mm, the effective focal length f5 of the fifth lens is 11.99 mm, the effective focal length f6 of the sixth lens is 21.25 mm, the effective focal length f7 of the seventh lens is 15.36 mm, and the effective focal length f8 of the eighth lens is -4.73 mm.

[0124] Table 6 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0125] Table 6

[0126]

[0127] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S16 in Example 2. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0128] Table 7

[0129]

[0130] Fig.10 The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.11 The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.12 The distortion curve of the optical imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.13 The magnification chromatic aberration curve of the optical imaging lens of the second embodiment 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 10 to 13 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0132] Embodiment 3

[0133] like Figures 14 to 19 As shown, the optical imaging lens of embodiment 3 is described. Fig.14 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.15 A schematic structural diagram of the optical imaging lens of Example 3-2 is shown.

[0134] like Figure 14 to Figure 15 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, a seventh spacing element P7, and an eighth lens E8 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis. In this embodiment, a pressure ring is further arranged on the image side of the eighth lens E8.

[0135] like Fig.14, which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, the object side surface and image side surface of the first spacer element 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 element 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 element 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 element 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 fifth spacer element 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 surface and image side surface of the sixth spacer element 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 and image side surface of the seventh spacer element P7 are in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The object side surface of the pressure ring contacts the image side surface S16 of the eighth lens.

[0136] like Fig.15 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0137] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1 and Example 3-2 are shown in Table 8.

[0138] Table 8

[0139]

[0140]

[0141] In the third embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The object side surface S15 of the eighth lens is a convex surface, and the image side surface S16 of the eighth lens is a concave surface.

[0142] In Example 3, the effective focal length f1 of the first lens is 7.91 mm, the effective focal length f2 of the second lens is -8.40 mm, the effective focal length f3 of the third lens is 6.61 mm, the effective focal length f4 of the fourth lens is -20.90 mm, the effective focal length f5 of the fifth lens is 12.34 mm, the effective focal length f6 of the sixth lens is 22.12 mm, the effective focal length f7 of the seventh lens is 21.13 mm, and the effective focal length f8 of the eighth lens is -5.09 mm.

[0143] Table 9 shows a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters.

[0144] Table 9

[0145]

[0146]

[0147] Table 10 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S16 in Example 3. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0148] Table 10

[0149]

[0150] Fig.16 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.17 The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.18 The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.19 The magnification 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.

[0151] according to Figures 16 to 19 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0152] Embodiment 4

[0153] like Figure 20 to Figure 25 As shown, the optical imaging lens of Example 4 is described. Fig. 20 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Example 4-1. Fig.21A schematic structural diagram of the optical imaging lens of Example 4-2 is shown.

[0154] like Figure 20 to Figure 21 As shown, the optical imaging lens comprises a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, a seventh spacing element P7, and an eighth lens E8 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis. In this embodiment, a pressure ring is further arranged on the image side of the eighth lens E8.

[0155] like Fig. 20 , which is a schematic diagram of the structure of the optical imaging lens of Example 4-1. In this example, the object side surface and image side surface of the first spacer element 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 element 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 element 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 element 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 fifth spacer element 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 surface and image side surface of the sixth spacer element 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 and image side surface of the seventh spacer element P7 are in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens, respectively. The object side surface of the pressure ring contacts the image side surface S16 of the eighth lens.

[0156] like Fig.21 FIG. 4 is a schematic diagram of the structure of the optical imaging lens of Example 4-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 4-1, and the relevant description in Example 4-1 may be referred to, and will not be repeated here.

[0157] In summary, the structural parameters of the optical imaging lens of Example 4 in Example 4-1 and Example 4-2 are shown in Table 11.

[0158] Table 11

[0159]

[0160]

[0161] In Embodiment 4, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a concave surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface. The object side surface S15 of the eighth lens is a convex surface, and the image side surface S16 of the eighth lens is a concave surface.

[0162] In Example 4, the effective focal length f1 of the first lens is 7.95 mm, the effective focal length f2 of the second lens is -8.68 mm, the effective focal length f3 of the third lens is 6.54 mm, the effective focal length f4 of the fourth lens is -19.82 mm, the effective focal length f5 of the fifth lens is 13.07 mm, the effective focal length f6 of the sixth lens is 21.06 mm, the effective focal length f7 of the seventh lens is 51.30 mm, and the effective focal length f8 of the eighth lens is -5.67 mm.

[0163] Table 12 shows a basic structural parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0164] Table 12

[0165]

[0166]

[0167] Table 13 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S16 in Example 4. The surface shape of each aspheric lens is defined according to formula (1) in Example 1.

[0168] Table 13

[0169]

[0170]

[0171] Fig. 22 The axial chromatic aberration curve of the optical imaging lens of the fourth embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.23 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.24The distortion curve of the optical imaging lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.25 The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0172] according to Figure 22 to Figure 25 It can be seen that the optical imaging lens provided in the fourth embodiment can achieve good imaging quality.

[0173] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 14.

[0174] Table 14

[0175] Conditional / Example 1-1 1-2 2-1 2-2 3-1 3-2 4-1 4-2 R2 / (D1s-d1s) 12.11 6.83 9.91 6.07 11.05 6.20 10.33 6.43 EP01 / (T12+CP1) 4.53 4.91 4.28 4.62 4.24 4.25 3.64 3.92 EP12 / CT2 3.30 2.82 3.14 2.98 3.21 3.20 3.75 3.22 CT3 / (T23+CP2) 7.44 7.44 7.63 7.63 7.51 7.51 6.86 6.86 R3 / D2s 2.51 1.91 2.37 1.82 2.37 1.82 2.25 1.73 (T34+CP3) / EP23 1.14 1.76 0.92 1.01 0.95 0.84 0.95 0.95 R6 / (D3s-d3s) 13.31 4.77 9.85 4.49 10.39 4.64 10.38 4.73 EP34 / CT4 3.94 1.81 2.88 1.52 2.66 2.35 2.51 2.51 T45 / CP4 1.96 1.96 2.12 2.12 2.19 2.19 2.82 2.82 R8 / (D4s-d4s) -2.86 -2.81 -2.96 -2.92 -3.20 -3.15 -3.34 -3.29 T56 / CP5 2.29 2.29 2.59 2.59 2.80 2.80 2.85 2.85 f5 / (CT5+EP45) 11.14 12.63 11.18 11.18 11.06 11.06 11.45 11.45 R10 / d5s 5.70 5.70 5.67 5.62 5.48 5.48 5.76 5.76 (CT6+T67) / EP56 1.88 1.67 2.05 2.05 2.42 2.42 2.69 2.69 (CT7+CT8) / EP67 0.94 1.45 0.99 0.99 1.03 1.03 0.94 0.94 R13 / (D6m-d6m) 1.31 1.28 1.42 1.40 1.63 1.60 1.56 1.53 d7s / R14 1.36 1.36 1.43 1.43 1.55 1.55 1.71 1.71 R4×(D2s-D1s) -0.01 1.27 -0.07 1.21 -0.01 0.57 0.01 1.12 EP01 / (T12+CP2) 4.53 4.91 4.28 4.62 4.24 4.25 3.64 3.92

[0176] Table 15 shows the effective focal lengths of the lenses of the optical imaging lenses of Examples 1 to 4.

[0177] Table 15

[0178]

[0179]

[0180] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0181] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0182] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0183] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0184] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: The invention comprises a lens barrel and a lens group and a spacer element group arranged in the lens barrel, The lens group is composed of eight lenses, and the eight 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, a seventh lens and an eighth lens; The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens, and a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens; Among them, the spacing distance EP12 from the image side surface of the first spacing element to the object side surface of the second spacing element on the optical axis of the optical imaging lens and the center thickness CT2 of the second lens on the optical axis satisfy: 2.82≤EP12 / CT2≤3.75; the curvature radius R3 of the object side surface of the second lens and the outer diameter D2s of the object side surface of the second spacing element satisfy: 1.73≤R3 / D2s≤2.

51.

2. The optical imaging lens according to claim 1, wherein: The curvature radius R2 of the image-side surface of the first lens, the outer diameter D1s of the object-side surface of the first spacer element, and the inner diameter d1s of the object-side surface of the first spacer element satisfy the following: 6.07≤R2 / (D1s-d1s)≤12.

11.

3. The optical imaging lens according to claim 1, wherein: The central thickness CT3 of the third lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis and the maximum axial thickness CP2 of the second spacing element satisfy: 6.86≤CT3 / (T23+CP2)≤7.

63.

4. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens. The air gap T34 between the third lens and the fourth lens on the optical axis, the maximum axial thickness CP3 of the third spacer element, and the spacing distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis satisfy the following: 0.84≤(T34+CP3) / EP23≤1.

76.

5. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens. The curvature radius R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacing element, and the inner diameter d3s of the object side surface of the third spacing element satisfy the following: 4.49≤R6 / (D3s-d3s)≤13.

31.

6. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a third spacer element 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 element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens. A spacing distance EP34 from the image side surface of the third spacing element to the object side surface of the fourth spacing element on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy the following: 1.52≤EP34 / CT4≤3.

94.

7. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, An air interval T45 between the fourth lens and the fifth lens on the optical axis and a maximum axial thickness CP4 of the fourth spacing element satisfy the following: 1.96≤T45 / CP4≤2.

82.

8. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, A curvature radius R8 of the image side surface of the fourth lens, an outer diameter D4s of the object side surface of the fourth spacing element, and an inner diameter d4s of the object side surface of the fourth spacing element satisfy the following: -3.34≤R8 / (D4s-d4s)≤-2.

81.

9. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, An air interval T56 between the fifth lens and the sixth lens on the optical axis and a maximum axial thickness CP5 of the fifth spacing element satisfy the following: 2.29≤T56 / CP5≤2.

85.

10. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens. The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, and the spacing distance EP45 from the image side surface of the fourth spacing element to the object side surface of the fifth spacing element on the optical axis satisfy the following: 11.06≤f5 / (CT5+EP45)≤12.

63.

11. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, A curvature radius R10 of the image-side surface of the fifth lens and an inner diameter d5s of the object-side surface of the fifth spacer element satisfy the following: 5.48≤R10 / d5s≤5.

76.

12. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens. The center thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the spacing distance EP56 from the image side surface of the fifth spacing element to the object side surface of the sixth spacing element on the optical axis satisfy the following: 1.67≤(CT6+T67) / EP56≤2.

69.

13. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer element disposed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens. The center thickness CT7 of the seventh lens on the optical axis, the center thickness CT8 of the eighth lens on the optical axis, and the spacing distance EP67 from the image side surface of the sixth spacing element to the object side surface of the seventh spacing element on the optical axis satisfy the following: 0.94≤(CT7+CT8) / EP67≤1.

45.

14. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, The curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacing element, and the inner diameter d6m of the image side surface of the sixth spacing element satisfy the following: 1.28≤R13 / (D6m-d6m)≤1.

63.

15. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a seventh spacer element disposed between the seventh lens and the eighth lens and in contact with the image side surface of the seventh lens, An inner diameter d7s of the object-side surface of the seventh spacing element and a curvature radius R14 of the image-side surface of the seventh lens satisfy the following relationship: 1.36≤d7s / R14≤1.

71.

16. The optical imaging lens according to claim 1, wherein: The spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacing element on the optical axis, the air spacing T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacing element satisfy the following: 3.64≤EP01 / (T12+CP1)≤4.

91.

17. The optical imaging lens according to any one of claims 1 to 16, characterized in that: The first lens has positive focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has negative focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the seventh lens has positive focal power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; the eighth lens has negative focal power, the object side surface of the eighth lens is convex, and the image side surface of the eighth lens is concave.

18. The optical imaging lens according to any one of claims 1 to 16, characterized in that: The third lens has positive focal power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the fourth lens has negative focal power, the object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex; the fifth lens has positive focal power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave; the sixth lens has positive focal power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave.

Images