Optical imaging lens

Abstract

The invention provides an optical imaging lens, the optical imaging lens has eight lenses with focal power, and the optical imaging lens comprises a lens group, a spacing element group and a lens barrel group, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element in the direction of the optical axis of the optical imaging lens meet the following condition: f7 / EP67 is more than or equal to-8.25 and less than or equal to-6.82; the curvature radius R15 of the object side face of the eighth lens and the inner diameter d7m of the image side face of the seventh spacing element meet the condition that R15 / d7m is larger than or equal to 1.31 and smaller than or equal to 2.28. The multi-group optical imaging lens solves the problems that in the prior art, the rear end forming yield of the multi-group optical imaging lens is low, and stray light is serious.

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] The periscope telephoto lens has changed the placement of conventional telephoto lenses and broken through the bottleneck of size limiting the multiple. As terminal portable devices develop towards thinness and miniaturization, the optical imaging lens of the periscope telephoto has further weakened the size limitation. However, in the multi-group optical imaging lens, the seventh lens and the spacing elements before and after the seventh lens need to be reasonably arranged in space to make the seventh lens well formed. In addition, the light of the multi-group optical imaging lens will be reflected and extended after passing through the image side of the eighth lens, and the bidirectional stray light path from the front and rear of the rear group greatly affects the imaging quality. Therefore, how to control the shape of the seventh lens and the size of the spacing elements near it, while ensuring the reasonable spatial layout of the rear group and the molding yield of the seventh lens, blocking stray light and improving the imaging quality is a very important issue. Summary of the invention

[0003] The main purpose of the present invention is to provide an optical imaging lens to solve the problems of low rear-end molding yield and severe stray light in the prior art of multi-group optical imaging lenses.

[0004] In order to achieve the above-mentioned object, according to one aspect of the present invention, an optical imaging lens is provided, wherein the number of lenses having optical power of the optical imaging lens is eight, and the optical imaging lens comprises: a lens group, wherein the lens group comprises a first lens to an eighth lens arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group comprises at least a sixth spacer element located between a sixth lens and a seventh lens and at least partially in contact with the image side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; and a lens barrel group, wherein the lens group and the spacer element group are accommodated in the lens barrel group, and the lens barrel group is provided with a plurality of lens elements disposed in the lens barrel group, and the plurality of lens elements disposed in the lens barrel group are ... The object side to image side lens barrel group includes the first lens barrel to the fourth lens barrel which are arranged in sequence, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel; wherein, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element along the direction of the optical axis of the optical imaging lens satisfy: -8.25≤f7 / EP67≤-6.82; the curvature radius R15 of the object side surface of the eighth lens and the inner diameter d7m of the image side surface of the seventh spacing element satisfy: 1.31≤R15 / d7m≤2.28.

[0005] According to another aspect of the present invention, an optical imaging lens is provided, wherein the number of lenses having optical power of the optical imaging lens is eight, and the optical imaging lens comprises: a lens group, wherein the lens group comprises a first lens to an eighth lens arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group comprises at least a sixth spacer element located between a sixth lens and a seventh lens and at least partially in contact with the image side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; and a lens barrel group, wherein the lens group and the spacer element group are accommodated in the lens barrel group, and wherein the lens barrel group comprises a first lens to an eighth lens arranged in sequence from the object side to the image side of the optical imaging lens; The first lens barrel to the fourth lens barrel of the cloth, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel; wherein, the curvature radius R12 of the image side surface of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side surface of the sixth spacing element satisfy: -1.89≤R12×N6 / d6s≤-1.55; the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacing element along the optical axis satisfy: 9.95≤f6 / (CP6+CT6)≤13.98.

[0006] Further, the curvature radius R16 of the image side surface of the eighth lens, the outer diameter D40m of the image side end surface of the fourth lens barrel, and the inner diameter d40m of the image side end surface of the fourth lens barrel satisfy: 7.99≤R16 / (D40m-d40m)≤12.98.

[0007] Further, a curvature radius R14 of the image side surface of the seventh lens, a refractive index N7 of the seventh lens, an outer diameter D7m of the image side surface of the seventh spacing element, and an inner diameter d7m of the image side surface of the seventh spacing element satisfy: 31.57≤R14×N7×(D7m-d7m)≤47.64.

[0008] Further, a curvature radius R13 of the object side surface of the seventh lens, an outer diameter D7s of the object side surface of the seventh spacing element, and an inner diameter d7s of the object side surface of the seventh spacing element satisfy: -5.22≤R13 / (D7s-d7s)≤-3.22.

[0009] Furthermore, a curvature radius R12 of the image-side surface of the sixth lens, a refractive index N6 of the sixth lens, and an inner diameter d6s of the object-side surface of the sixth spacer element satisfy: -1.89≤R12×N6 / d6s≤-1.55.

[0010] Further, an effective focal length f6 of the sixth lens, a center thickness CT6 of the sixth lens on the optical axis, and a maximum thickness CP6 of the sixth spacing element along the optical axis satisfy: 9.95≤f6 / (CP6+CT6)≤13.98.

[0011] Further, the spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 5.18≤f5 / (CP4+T45)≤5.97.

[0012] Further, the curvature radius R10 of the image side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d30m of the image side end surface of the third lens barrel satisfy: -2.78≤R10×N5 / d30m≤-2.19.

[0013] Furthermore, the spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the inner diameter d4m of the image side surface of the fourth spacer element satisfy: 4.78≤R9 / (D4m-d4m)≤6.52.

[0014] Furthermore, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and the curvature radius R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacer element satisfy: 1.12≤R7 / d3m≤1.58.

[0015] Furthermore, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -4.84≤f2 / f1≤-2.37.

[0016] Further, 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 concave, and the image side surface of the second lens is convex, 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 convex, and the image side surface of the fourth lens is concave, 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 convex, the sixth lens has positive focal power, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex, the seventh lens has negative focal power, the object side surface of the seventh lens is concave, 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.

[0017] According to the technical solution of the present invention, the optical imaging lens has eight lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel group. The lens group includes a first lens to an eighth lens arranged in sequence from the object side to the image side of the optical imaging lens; the spacer element group includes at least a sixth spacer element located between a sixth lens and a seventh lens and at least partially in contact with the image side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; the lens group and the spacer element group are accommodated in the lens barrel group, and the lens barrel group includes The first to fourth lens barrels are arranged in sequence, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third to fifth lenses are accommodated in the third lens barrel, and the sixth to eighth lenses are accommodated in the fourth lens barrel; wherein, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element along the direction of the optical axis of the optical imaging lens satisfy: -8.25≤f7 / EP67≤-6.82; the curvature radius R15 of the object side surface of the eighth lens and the inner diameter d7m of the image side surface of the seventh spacing element satisfy: 1.31≤R15 / d7m≤2.28.

[0018] The optical imaging lens of the present application uses eight lenses with optical power, and the first lens to the eighth lens are arranged in sequence and spaced apart. In particular, the multi-group optical imaging lens of the present application is provided with four lens barrels to divide it into four groups, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel, so as to achieve a significant improvement in the magnification of the optical imaging lens. In the optical imaging lens, by limiting f7 / EP67 within a reasonable range, the interval between the sixth spacing element and the seventh spacing element along the direction of the optical axis of the optical imaging lens and the effective focal length of the seventh lens are constrained, the effect of optimizing the spatial structure can be achieved, the shape and thickness of the effective diameter part and the structural part of the seventh lens are adjusted, and the feasibility of the molding of the seventh lens is improved. However, at the same time, the light of the multi-group optical imaging lens will be reflected and extended after passing through the image side of the eighth lens, and the risk of the bidirectional stray light path from the front and rear ends of the seventh lens passing through the effective diameter of the seventh lens is high, which greatly affects the imaging quality. By limiting R15 / d7m within a reasonable range, the ratio of the inner diameter of the image-side surface of the seventh spacer element to the radius of curvature of the object-side surface of the eighth lens can be controlled, so that the light is diffused according to the planned light path, effectively blocking the bidirectional stray light from the front and rear ends of the seventh lens, and improving the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 A schematic diagram showing some parameters of an optical imaging lens according to any optional embodiment of the present invention is shown;

[0021] Figure 2 A schematic structural diagram of an optical imaging lens according to a first embodiment of the present invention is shown;

[0022] Figure 3 A schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention is shown;

[0023] Figures 4 to 7 The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of the first embodiment are respectively shown;

[0024] Figure 8 A schematic structural diagram of an optical imaging lens according to a third embodiment of the present invention is shown;

[0025] Fig. 9 A schematic structural diagram of an optical imaging lens according to a fourth embodiment of the present invention is shown;

[0026] 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 third embodiment are respectively shown;

[0027] Fig.14 A schematic structural diagram of an optical imaging lens according to a fifth embodiment of the present invention is shown;

[0028] Fig.15 A schematic structural diagram of an optical imaging lens according to a sixth embodiment of the present invention is shown;

[0029] Figures 16 to 19 The axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens of Example 5 are respectively shown;

[0030] Fig. 20 A schematic structural diagram of an optical imaging lens according to a seventh embodiment of the present invention is shown;

[0031] Fig.21 A schematic structural diagram of an optical imaging lens according to an eighth embodiment of the present invention is shown;

[0032] 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 Example 7 are respectively shown;

[0033] Figure 26 to Figure 27 The stray light path diagram and the stray light energy intensity distribution diagram of an optical imaging lens of an optional embodiment of the present invention under the conditions of f7 / EP67=-11.28 and R15 / d7m=1.33 are respectively shown;

[0034] Figure 28 to Figure 29 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of f7 / EP67=-11.28 and R15 / d7m=2.5 in the prior art are shown respectively;

[0035] Figure 30 to Figure 31 The stray light path diagram and the stray light energy intensity distribution diagram of the optical imaging lens under the conditions of f7 / EP67=-11.28 and R15 / d7m=1.15 in the prior art are respectively shown.

[0036] The above drawings include the following reference numerals:

[0037] P10, first lens barrel; P20, second lens barrel; P30, third lens barrel; P40, fourth lens barrel; E1, first lens; E2, second lens; E3, third lens; P3, third spacer; E4, fourth lens; P4, fourth spacer; E5, fifth lens; E6, sixth lens; P6, sixth spacer; E7, seventh lens; P7, seventh spacer; E8, eighth lens; S1, object side of first lens; S2, image side of first lens; S5, image side of second lens object side surface of the second lens; S6, image side surface of the third lens; S12, object side surface of the third lens; S13, image side surface of the third lens; S14, object side surface of the fourth lens; S15, image side surface of the fourth lens; S16, object side surface of the fifth lens; S17, image side surface of the fifth lens; S19, object side surface of the sixth lens; S20, image side surface of the sixth lens; S21, object side surface of the seventh lens; S22, image side surface of the seventh lens; S23, object side surface of the eighth lens; S24, image side surface of the eighth lens. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the eye-side surface, 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 display-side surface, 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.

[0044] In order to solve the problems of low rear-end molding yield and severe stray light of multi-group optical imaging lenses in the prior art, the present invention provides an optical imaging lens.

[0045] First embodiment

[0046] like Figures 1 to 27 As shown, the optical imaging lens has eight lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel group. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to an eighth lens arranged in sequence and spaced apart; the spacer element group includes at least a sixth spacer element located between a sixth lens and a seventh lens and at least partially in contact with the image side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; the lens group and the spacer element group are accommodated in the lens barrel group, and from the object side to the image side of the optical imaging lens, the lens barrel group includes a first lens to an eighth lens arranged in sequence and spaced apart. The first lens barrel to the fourth lens barrel are arranged, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel; wherein, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element along the direction of the optical axis of the optical imaging lens satisfy: -8.25≤f7 / EP67≤-6.82; the curvature radius R15 of the object side surface of the eighth lens and the inner diameter d7m of the image side surface of the seventh spacing element satisfy: 1.31≤R15 / d7m≤2.28.

[0047] The optical imaging lens of the present application uses eight lenses with optical power, and the first lens to the eighth lens are arranged in sequence and spaced apart. In particular, the multi-group optical imaging lens of the present application is provided with four lens barrels to divide it into four groups, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel, so as to achieve a significant improvement in the magnification of the optical imaging lens. In the optical imaging lens, by limiting f7 / EP67 within a reasonable range, the interval between the sixth spacing element and the seventh spacing element along the direction of the optical axis of the optical imaging lens and the effective focal length of the seventh lens are constrained, the effect of optimizing the spatial structure can be achieved, the shape and thickness of the effective diameter part and the structural part of the seventh lens are adjusted, and the feasibility of the molding of the seventh lens is improved. However, at the same time, the light of the multi-group optical imaging lens will be reflected and extended after passing through the image side of the eighth lens, and the risk of the bidirectional stray light path from the front and rear ends of the seventh lens passing through the effective diameter of the seventh lens is high, which greatly affects the imaging quality. By limiting R15 / d7m within a reasonable range, the ratio of the inner diameter of the image-side surface of the seventh spacer element to the radius of curvature of the object-side surface of the eighth lens can be controlled, so that the light is diffused according to the planned light path, effectively blocking the bidirectional stray light from the front and rear ends of the seventh lens, and improving the imaging quality of the optical imaging lens.

[0048] Table 1 below shows the stray light distribution of the optical imaging lens of the optional embodiment scheme 1 of the present application and schemes 2 and 3 in the prior art under the condition of f7 / EP67=-11.28 with different R15 / d7m values. In the stray light energy intensity distribution diagram, the X and Y axes represent the spatial position of the imaging surface, showing the energy distribution peak position of the stray light corresponding to the imaging surface, and the color depth represents the intensity of the stray light energy, that is, the luminous flux of the stray light per square millimeter on the imaging surface (unit: FLUX / sq-MM).

[0049] Table 1

[0050] Program No. 1 2 3 f7 / EP67 -11.28 -11.28 -11.28 R15 / d7m 1.33 4.0 0.5 Stray light path diagram Attached Fig.26 Attached Fig.28 Attached Fig.30 Stray light energy intensity distribution Attached Fig. 27 Attached Fig.29 Attached Fig.31

[0051] The optical imaging lenses shown in Scheme 2 and Scheme 3 belong to the prior art. When Scheme 2 is f7 / EP67=-11.28 and R15 / d7m=2.5, the light distribution is as follows: Fig.28 and Fig.29 As shown in Figure 1, when the value of R15 / d7m is too large, the stray light energy is high and the image clarity is low. When scheme 3 is f7 / EP67=-11.28 and R15 / d7m=1.15, the light distribution is as follows: Fig.30 and Fig.31 As shown in FIG. 1 , when the value of R15 / d7m is too small, the light spot on the imaging surface of the optical imaging lens is obvious, which seriously affects the imaging quality.

[0052] The optical imaging lens shown in Scheme 1 belongs to an embodiment of the present application. When Scheme 1 is f7 / EP67=-11.28 and R15 / d7m=1.33, the distribution of stray light is as follows: Fig.26 and Fig. 27 As shown, the optical imaging lens of the present application has clear imaging, reduced aberration, and significantly reduced stray light energy.

[0053] In this embodiment, the curvature radius R16 of the image side surface of the eighth lens, the outer diameter D40m of the image side end surface of the fourth lens barrel, and the inner diameter d40m of the image side end surface of the fourth lens barrel satisfy the following conditions: 7.99≤R16 / (D40m-d40m)≤12.98. If the value of R16 / (D40m-d40m) is too small, the inner and outer diameters of the image side end surface of the fourth lens barrel are relatively large, which may easily lead to the instability of the assembly of the eighth lens, affect the stability of the optical imaging lens during the assembly process, reduce the yield rate, and fail to effectively control the stray light reflected back by the light emitted from the image side surface of the eighth lens after being incident on the image side end of the fourth lens barrel, resulting in impaired imaging quality. If the value of R16 / (D40m-d40m) is too large, it may be impossible to fully block the stray light passing through the image side end between the eighth lens and the fourth lens barrel, reduce the degree of invalid light path shielding, and reduce imaging quality. By limiting R16 / (D40m-d40m) within a reasonable range, the stability of the optical imaging lens during the assembly process can be improved. At the same time, the mutual restriction between the light and the image-side end surface of the fourth lens barrel can be effectively controlled, the risk of stray light generation can be reduced and the degree of stray light shielding can be increased, thereby improving the imaging quality of the optical imaging lens.

[0054] In this embodiment, the curvature radius R14 of the image side surface of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D7m of the image side surface of the seventh spacer element, and the inner diameter d7m of the image side surface of the seventh spacer element satisfy the following: 31.57≤R14×N7×(D7m-d7m)≤47.64. If the value of R14×N7×(D7m-d7m) is too large, the processability of the edge of the effective diameter of the seventh lens and the structural part of the seventh lens will be weakened, affecting the stability of the assembly process. At the same time, the annular band of the image side surface of the seventh spacer element is too large to block the light from the effective diameter of the seventh lens, reducing the clarity of the imaging edge. If the value of R14×N7×(D7m-d7m) is too small, the light refraction angle of the seventh lens cannot be effectively controlled, resulting in uneven light refraction and reduced imaging quality. At the same time, the annular band of the image side surface of the seventh spacer element is too small, which will cause the seventh lens and the eighth lens to be unstable, greatly reducing the effect of intercepting stray light. By controlling R14×N7×(D7m-d7m) within a reasonable range, the edge of the effective diameter of the seventh lens and the molding yield of the structural part of the seventh lens can be enhanced, ensuring that the light refraction angle is within a reasonable range. At the same time, the annular band width of the image side surface of the seventh spacer element is reasonably set, thereby improving the stability of the assembly process and the imaging quality.

[0055] In this embodiment, the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D7s of the object side surface of the seventh spacer element, and the inner diameter d7s of the object side surface of the seventh spacer element satisfy: -5.22≤R13 / (D7s-d7s)≤-3.22. If the value of R13 / (D7s-d7s) is too large, that is, the annular band width of the object side surface of the seventh spacer element is too large, the edge light transmittance from the effective diameter of the front lens is reduced, thereby reducing the clarity of the imaging edge. At the same time, the curvature degree of the object side surface of the seventh lens is too small, which is not conducive to the effective propagation of light. If the value of R13 / (D7s-d7s) is too small, the curvature degree of the light passing through the object side surface of the seventh lens is too large, resulting in an unreasonable light refraction angle, increasing aberrations and affecting imaging quality. At the same time, the annular band width of the object side surface of the seventh spacer element is too small, resulting in insufficient support with the structural part of the seventh lens, affecting assembly stability. By controlling R13 / (D7s-d7s) within a reasonable range, it is possible to ensure that the structural portion of the seventh lens is sufficiently supported by the object side of the seventh spacing element, while controlling the light refraction angle within a reasonable range, and the light propagation path through the seventh lens is reasonable, thereby improving assembly stability and imaging quality.

[0056] In this embodiment, the curvature radius R12 of the image side surface of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side surface of the sixth spacer element satisfy: -1.89≤R12×N6 / d6s≤-1.55. If the value of R12×N6 / d6s is too large, the curvature radius and refractive index of the sixth lens cannot be effectively controlled, which affects the effective diameter of light passing through. At the same time, the inner diameter of the sixth spacer element is too large and cannot effectively block the stray light between the sixth lens and the seventh lens. If the value of R12×N6 / d6s is too small, the inner diameter of the object side surface of the sixth spacer element is too small, which is not conducive to the transmission of edge light and affects the imaging quality. By limiting R12×N6 / d6s within a reasonable range, the curvature radius and refractive index of the image side surface of the sixth lens can be reasonably constrained, and the inner diameter of the sixth spacer element is properly controlled, which effectively blocks the edge stray light from propagating between the sixth lens and the seventh lens, thereby improving the imaging quality.

[0057] In this embodiment, the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacer element along the optical axis satisfy the following relationship: 9.95≤f6 / (CP6+CT6)≤13.98. If the value of f6 / (CP6+CT6) is too large, the sum of the maximum thickness of the sixth spacer element along the optical axis and the center thickness of the sixth lens is too small, that is, the air gap between the sixth lens and the seventh lens is too small, which is not conducive to the reasonable propagation of light. At the same time, it also causes the light transmittance at the edge of the sixth lens to decrease, and the edge light becomes invalid light, increasing the risk of stray light and affecting the imaging quality. If the value of f6 / (CP6+CT6) is too small, the air gap between the sixth lens and the seventh lens is too large, resulting in uneven scattering and refraction of light between the sixth lens and the seventh lens, which also affects the imaging clarity and stability. By limiting f6 / (CP6+CT6) within a reasonable range, it is possible to ensure that the air gap formed by the sixth lens and the sixth spacing element is reasonable, optimize the light passing rate within the effective diameter of the sixth lens, reduce edge invalid light, and reduce stray light risk, thereby improving the imaging quality and stability of the optical imaging lens. At the same time, by constraining the thickness of the sixth lens and the sixth spacing element, the edge thickness ratio of the sixth lens is controlled, and the molding yield and assembly stability of the sixth lens are improved.

[0058] In this embodiment, the spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 5.18≤f5 / (CP4+T45)≤5.97. If the value of f5 / (CP4+T45) is too large, the maximum thickness of the fourth spacer element along the optical axis and the air gap between the fourth lens and the fifth lens are too small, which is not conducive to controlling the air gap between the fourth lens and the fifth lens, affecting the assembly stability and reliability of the optical imaging lens. If the value of f5 / (CP4+T45) is too small, the maximum thickness of the fourth spacer element along the optical axis and the air gap between the fourth lens and the fifth lens are too large, which may cause light scattering and reduced imaging performance. By controlling f5 / (CP4+T45) within a reasonable range, the step difference between the fourth lens and the fifth lens can be optimized to improve the assembly stability and reliability of the lens. At the same time, the thickness of the fourth spacer element and the air gap between the fourth lens and the fifth lens on the optical axis are controlled to maintain an appropriate air gap to ensure smooth passage of light and optimize imaging quality.

[0059] In this embodiment, the radius of curvature R10 of the image side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d30m of the image side end surface of the third lens barrel satisfy: -2.78≤R10×N5 / d30m≤-2.19. If the value of R10×N5 / d30m is too large, excessive deflection of light is not conducive to transmission to the rear lens group, resulting in a decrease in imaging quality and also affecting the assembly stability of the fifth lens. If the value of R10×N5 / d30m is too small, the degree of convergence of light is insufficient and it is also easily blocked by the image side end of the third lens barrel, which is not conducive to the transition of light to the rear. By limiting R10×N5 / d30m within a reasonable range, the refraction degree of the fifth lens and the size of the image side surface of the third lens barrel can be effectively controlled, and the degree of blocking of the invalid light path is improved, thereby significantly improving the imaging quality of the optical imaging lens, ensuring that the light propagates according to the planned light path, and reducing the influence of stray light.

[0060] In this embodiment, the spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The curvature radius R9 of the object side surface of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the inner diameter d4m of the image side surface of the fourth spacer element satisfy the following: 4.78≤R9 / (D4m-d4m)≤6.52. If the value of R9 / (D4m-d4m) is too large, the annular band width of the fourth spacer element is small, which is not enough to block the small amount of light reflected back from the structural part of the fifth lens, resulting in an increase in stray light and affecting the imaging quality. At the same time, the curvature radius of the object side surface of the fifth lens is too large, resulting in a large refraction angle of the light, which affects the smooth passage of the light through the effective diameter and reduces the imaging clarity. If the value of R9 / (D4m-d4m) is too small, that is, the annular band width of the image side surface of the fourth spacer element is too large, the edge light transmittance from the effective diameter of the front lens is reduced, thereby reducing the clarity of the imaging edge. At the same time, the curvature radius of the object side surface of the fifth lens is too small, which is not conducive to the effective propagation of light. By controlling R9 / (D4m-d4m) within a reasonable range and by controlling the ratio of the radius of curvature of the object side surface of the fifth lens element to the width of the annular zone on the image side surface of the fourth spacing element, stray light can be effectively blocked, ensuring that the refraction angle of light is moderate, and improving the smoothness of the effective path of light passing through the fifth lens element, thereby improving the imaging quality and stability during the assembly process, reducing the scattering of edge light, and optimizing the imaging performance of the optical imaging lens.

[0061] In this embodiment, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and the curvature radius R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacer element satisfy: 1.12≤R7 / d3m≤1.58. If the value of R7 / d3m is too small, the object side surface of the fourth lens and the image side surface of the third spacer element cannot fully support each other, resulting in a decrease in stability during the assembly process, affecting the positioning of the fourth lens. If the value of R7 / d3m is too large, the effective diameter portion of the object side surface of the fourth lens will be too close to the inner diameter of the third spacer element, resulting in the path of the effective diameter of the light passing through the fourth lens being limited, affecting the imaging effect. By limiting R7 / d3m within a reasonable range, it is possible to ensure that the object side surface of the fourth lens and the image side surface of the third spacer element are stable, optimize the stability during the assembly process, and at the same time, the curvature radius of the object side surface of the fourth lens is suitable, ensuring that the light smoothly transitions from the third lens to the fourth lens, reducing the angle deviation of light refraction, and improving the imaging quality and the positioning accuracy of the fourth lens.

[0062] In this embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -4.84≤f2 / f1≤-2.37. If the value of f2 / f1 is too large, the difference between the effective focal lengths of the first lens and the second lens is too small, and the convergence and divergence of light cannot be effectively controlled, which may cause imaging distortion and reduced imaging quality. If the value of f2 / f1 is too small, the difference between the effective focal length of the first lens and the effective focal length of the second lens is too large, making the optical imaging lens too sensitive, making it difficult to fine-tune the positions of the first lens and the second lens during assembly, affecting the production quality and imaging performance of the optical imaging lens. By controlling f2 / f1 within a reasonable range, the sensitivity of the first lens and the second lens can be effectively reduced, making the assembly and adjustment process of the front-end lens easier, while ensuring that the convergence and divergence of light are reasonably controlled, reducing image distortion, and improving the production quality and imaging stability of the optical imaging lens, thereby improving the imaging performance and scope of application of the optical imaging lens.

[0063] In this embodiment, 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 concave, and the image side surface of the second lens is convex, 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 convex, and the image side surface of the fourth lens is concave, 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 convex, the sixth lens has positive focal power, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex, the seventh lens has negative focal power, the object side surface of the seventh lens is concave, 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.

[0064] In order to optimize the transition and focusing of light between lens groups, the optical imaging lens is equipped with eight lenses. First, the first lens and the third lens are positive focal lenses at the front end. The object side of the first lens and the object side of the third lens are convex surfaces, which can effectively converge the light entering the front end of the optical imaging lens. At the same time, the image side of the first lens and the image side of the third lens are concave surfaces, which can control the smoothness of light convergence, avoid excessive divergence angles of light during the convergence process, and ensure that the light smoothly transitions to the rear lens group. The second lens and the fourth lens are negative focal lenses. The object side of the second lens and the object side of the fourth lens are concave surfaces, which can diverge the light after convergence by the first lens and the third lens, avoiding excessive concentration of light at the front end, causing overexposure of the imaging center area or light loss at the edge of the lens. At the same time, the image side of the second lens and the image side of the fourth lens are convex surfaces, which can re-converge the light to a certain extent, ensuring that the light can still remain within the effective diameter of the optical imaging lens after divergence, creating conditions for the focusing of the rear lens group.

[0065] At the same time, the fifth lens and the sixth lens have positive focal power, and the object side of the fifth lens and the image side of the fifth lens are both convex, which strengthens the focusing effect of light, further concentrates the light passing through the front lens group, and forms a clearer intermediate image. At the same time, the object side of the sixth lens is concave, and the image side of the sixth lens is convex, which can slightly focus the light after divergence, providing a larger field of view for the final imaging. The seventh lens and the eighth lens, as the rear end of the optical imaging lens, have negative focal power and positive focal power respectively. The object side of the seventh lens and the image side of the seventh lens are both concave, and the light is appropriately diverged after being gathered by the fifth lens and the sixth lens to avoid excessive focusing of the light. The eighth lens, as the last lens in the lens group, is designed as a convex-concave type, that is, the object side is convex and the image side is concave. The object side of the eighth lens is convex, which can effectively focus the incoming light, and the image side of the eighth lens is concave, which can optimize the focusing process, avoid the loss of edge light, and ensure the consistency and clarity of the imaging of the optical imaging lens.

[0066] 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. Optionally, the optical imaging lens can be simulated by CODEV software. In the process of simulation using the above software and / or tools, the surface shape of each lens can be appropriately adjusted according to the surface shape of the software and / or tool used.

[0067] 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.

[0068] 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.

[0069] Second embodiment

[0070] like Figures 1 to 27 As shown, the optical imaging lens has eight lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel group. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to an eighth lens arranged in sequence and spaced apart; the spacer element group includes at least a sixth spacer element located between a sixth lens and a seventh lens and at least partially in contact with the image side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; the lens group and the spacer element group are accommodated in the lens barrel group, and from the object side to the image side of the optical imaging lens, the lens barrel group includes a first lens barrel to a fourth lens barrel arranged in sequence and spaced apart. , the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel; wherein, the curvature radius R12 of the image side surface of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side surface of the sixth spacing element satisfy: -1.89≤R12×N6 / d6s≤-1.55; the effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacing element along the optical axis satisfy: 9.95≤f6 / (CP6+CT6)≤13.98.

[0071] The optical imaging lens of the present application uses eight lenses with optical power, and the first lens to the eighth lens are arranged in sequence and spaced apart. In particular, the multi-group optical imaging lens of the present application is provided with four lens barrels to divide it into four groups, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel, so as to achieve a significant improvement in the magnification of the optical imaging lens. In the optical imaging lens, by limiting R12×N6 / d6s within a reasonable range, the radius of curvature and the refractive index of the image side of the sixth lens can be reasonably constrained, and the inner diameter of the sixth spacer element is properly controlled, while transmitting the edge light, the light is effectively blocked from entering the structural part of the sixth lens, avoiding the generation and propagation of excess stray light, and improving the imaging quality. However, the image side of the sixth lens is more prominent than the structural part, resulting in poor molding and assembly stability of the sixth lens. By limiting f6 / (CP6+CT6) within a reasonable range, controlling the light deflection path, reducing invalid edge light, optimizing the light passing rate within the effective diameter of the sixth lens, reducing the risk of stray light, and at the same time constraining the thickness of the sixth lens and the sixth spacing element to control the edge thickness ratio of the sixth lens, the molding yield and assembly stability of the sixth lens are improved.

[0072] It should be noted that this embodiment also includes other conditional expressions in the above embodiment, which will not be described one by one here.

[0073] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0074] 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.

[0075] 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.

[0076] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d3m, D40m, and EP67 are marked 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.

[0077] 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.

[0078] It should be noted that any one of the following embodiments 1 to 8 is applicable to all embodiments of the present application.

[0079] Embodiment 1

[0080] like Figure 2 As shown, the optical imaging lens of the first embodiment of the present application is described. Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 is shown.

[0081] like Figure 2 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8. The first lens E1 is accommodated in the first lens barrel P10, the second lens E2 is accommodated in the second lens barrel P20, the third lens E3 to the fifth lens E5 are accommodated in the third lens barrel P30, and the sixth lens E6 to the eighth lens E8 are accommodated in the fourth lens barrel P40.

[0082] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S5 of the second lens is concave, and the image side surface S6 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S12 of the third lens is convex, and the image side surface S13 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S14 of the fourth lens is convex, and the image side surface S15 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S16 of the fifth lens is convex, and the image side surface S17 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S19 of the sixth lens is concave, and the image side surface S20 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S21 of the seventh lens is concave, and the image side surface S22 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object-side surface S23 of the eighth lens is a convex surface, and the image-side surface S24 of the eighth lens is a concave surface.

[0083] Table 2 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0084] Table 2

[0085] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Aspheric 15.2291 0.9296 1.55 56.1 0.0000 S2 Aspheric 34.4660 2.3504 0.0000 S3 Spherical endless 4.8000 S4 Spherical endless 2.1626 S5 Aspheric -20.5254 0.6500 1.67 20.4 0.0000 S6 Aspheric -28.2521 1.0525 51.5819 S7 Spherical endless 0.0000 S8 Spherical endless -6.0000 S9 Spherical endless 6.0000 S10 Spherical endless 0.6500 S11 Spherical endless -0.5535 S12 Aspheric 6.3620 1.1588 1.55 56.1 0.5545 S13 Aspheric 50.9982 0.0799 -98.5000 S14 Aspheric 6.6824 0.6677 1.62 25.9 -1.0717 S15 Aspheric 3.1725 1.2769 -0.8678 S16 Aspheric 11.4462 1.2330 1.55 56.1 7.7991 S17 Aspheric -11.4141 1.6200 -7.2612 STO Spherical endless 0.0133 S19 Aspheric -13.5501 1.2100 1.67 20.4 0.0000 S20 Aspheric -5.2786 0.1000 0.8286 S21 Aspheric -9.3889 0.6697 1.57 37.4 4.1279 S22 Aspheric 9.8933 0.8199 4.5739 S23 Aspheric 12.7116 0.9848 1.54 55.7 -98.5000 S24 Aspheric 7.2908 6.0335 -1.1958 S25 Spherical endless -0.0133 S26 Spherical endless 0.2100 1.52 64.2 S27 Spherical endless 1.2742 S28 Spherical endless

[0086] In Embodiment 1, the object side surface and the image side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0087]

[0088] 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 direction of the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 2 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspheric mirror surface in Example 1.

[0089] Table 3 shows the coefficients of the higher order terms that can be used for each aspheric mirror surface in the embodiment, wherein the surface shape of each aspheric surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the eighth lens are all aspheric surfaces.

[0090] Table 3

[0091]

[0092]

[0093] 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 field angles. Figure 7 The chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the degree to which the focusing points of light rays of different wavelengths do not completely overlap.

[0094] 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.

[0095] Embodiment 2

[0096] like Figure 3 As shown, the optical imaging lens of the second embodiment of the present application is described, which is different from the first embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrels, etc. are different.

[0097] Figure 3 The structure diagram of the optical imaging lens of the second embodiment is shown. For the sake of brevity, some descriptions similar to those of the first embodiment are omitted. In this embodiment, in the fourth lens barrel, the inner diameters of the object side surfaces of the sixth spacing element and the seventh spacing element are both reduced, which is beneficial to intercepting stray light at the rear end of the optical imaging lens and is beneficial to improving the imaging quality of the optical imaging lens.

[0098] Embodiment 3

[0099] like Figure 8 As shown, the optical imaging lens of the third embodiment of the present application is described. Figure 8 A schematic structural diagram of an optical imaging lens according to a third embodiment is shown.

[0100] like Figure 8 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8. The first lens E1 is accommodated in the first lens barrel P10, the second lens E2 is accommodated in the second lens barrel P20, the third lens E3 to the fifth lens E5 are accommodated in the third lens barrel P30, and the sixth lens E6 to the eighth lens E8 are accommodated in the fourth lens barrel P40.

[0101] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S5 of the second lens is concave, and the image side surface S6 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S12 of the third lens is convex, and the image side surface S13 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S14 of the fourth lens is convex, and the image side surface S15 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S16 of the fifth lens is convex, and the image side surface S17 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S19 of the sixth lens is concave, and the image side surface S20 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S21 of the seventh lens is concave, and the image side surface S22 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object-side surface S23 of the eighth lens is a convex surface, and the image-side surface S24 of the eighth lens is a concave surface.

[0102] Table 4 shows the basic structural parameters of the optical imaging lens of Example 3, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0103] Table 4

[0104] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Aspheric 13.0723 0.8775 1.55 56.1 0.0000 S2 Aspheric 24.4490 2.4489 0.0000 S3 Spherical endless 4.8000 S4 Spherical endless 2.1568 S5 Aspheric -23.4431 0.7000 1.67 20.4 0.0000 S6 Aspheric -33.6400 1.0255 63.7325 S7 Spherical endless 0.0000 S8 Spherical endless 0.6500 S9 Spherical endless -0.5255 S12 Aspheric 6.1343 1.1567 1.55 56.1 0.1709 S13 Aspheric 69.1088 0.0799 91.0655 S14 Aspheric 7.2470 0.6879 1.62 25.9 -0.7189 S15 Aspheric 3.1626 0.9965 -0.8634 S16 Aspheric 12.3386 1.3440 1.55 56.1 7.9601 S17 Aspheric -10.5087 1.6500 -6.9303 STO Aspheric endless 0.0133 S19 Aspheric -12.9345 1.2000 1.67 20.4 0.0000 S20 Aspheric -6.2814 0.1000 1.4451 S21 Aspheric -9.9697 0.7639 1.55 56.1 5.0413 S22 Aspheric 11.1574 0.8444 7.5901 S23 Aspheric 7.6044 0.9442 1.54 55.7 -76.0098 S24 Aspheric 5.8261 6.0376 -2.0975 S25 Spherical endless -0.0133 S26 Spherical endless 0.2100 1.52 64.2 S24 Spherical endless 1.2780 S25 Spherical endless

[0105] Table 5 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the eighth lens are all aspherical surfaces.

[0106] Table 5

[0107]

[0108]

[0109] Fig.10 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.11 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.12 The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.13 The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the degree to which the focusing points of light rays of different wavelengths do not completely overlap.

[0110] according to Figures 10 to 13It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0111] Embodiment 4

[0112] like Fig. 9 As shown, the optical imaging lens of the fourth embodiment of the present application is described, which is different from the third embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrels, etc. are different.

[0113] Fig. 9 The structure diagram of the optical imaging lens of the fourth embodiment is shown. For the sake of brevity, some descriptions similar to those of the third embodiment are omitted. In this embodiment, in the fourth lens barrel, the inner diameter of the object side of the sixth spacer element is increased, which is conducive to the transmission of the marginal light from the front lens group, thereby improving the clarity of the optical imaging quality.

[0114] Embodiment 5

[0115] like Fig.14 As shown, the optical imaging lens of the fifth embodiment of the present application is described. Fig.14 A schematic structural diagram of an optical imaging lens according to a fifth embodiment is shown.

[0116] like Fig.14 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8. The first lens E1 is accommodated in the first lens barrel P10, the second lens E2 is accommodated in the second lens barrel P20, the third lens E3 to the fifth lens E5 are accommodated in the third lens barrel P30, and the sixth lens E6 to the eighth lens E8 are accommodated in the fourth lens barrel P40.

[0117] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S5 of the second lens is concave, and the image side surface S6 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S12 of the third lens is convex, and the image side surface S13 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S14 of the fourth lens is convex, and the image side surface S15 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S16 of the fifth lens is convex, and the image side surface S17 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S19 of the sixth lens is concave, and the image side surface S20 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S21 of the seventh lens is concave, and the image side surface S22 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object-side surface S23 of the eighth lens is a convex surface, and the image-side surface S24 of the eighth lens is a concave surface.

[0118] Table 6 shows the basic structural parameters of the optical imaging lens of Example 5, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0119] Table 6

[0120]

[0121]

[0122] Table 7 shows the coefficients of the higher order terms that can be used for each aspheric mirror surface in the embodiment, wherein the surface shape of each aspheric surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the eighth lens are all aspheric surfaces.

[0123] Table 7

[0124]

[0125]

[0126] Fig.16 The axial chromatic aberration curve of the optical imaging lens of Example 5 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 Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.18 The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.19 The magnification chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the degree to which the focusing points of light of different wavelengths do not completely overlap.

[0127] according to Figures 16 to 19 It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0128] Embodiment 6

[0129] like Fig.15 As shown, the optical imaging lens of the sixth embodiment of the present application is described, which differs from the fifth embodiment in that the distances and thicknesses between the various spacing elements, lenses, lens barrels, etc. are different.

[0130] Fig.15 The structure diagram of the optical imaging lens of the sixth embodiment is shown. For the sake of brevity, some descriptions similar to those of the fifth embodiment are omitted. In this embodiment, in the fourth lens barrel, the inner diameter of the object side of the sixth spacer element is increased, which is conducive to the transmission of the marginal light from the front lens group, thereby improving the clarity of the optical imaging quality.

[0131] Embodiment 7

[0132] like Fig. 20 As shown, the optical imaging lens of the seventh embodiment of the present application is described. Fig. 20 A schematic structural diagram of an optical imaging lens according to a seventh embodiment is shown.

[0133] like Fig. 20 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8. The first lens E1 is accommodated in the first lens barrel P10, the second lens E2 is accommodated in the second lens barrel P20, the third lens E3 to the fifth lens E5 are accommodated in the third lens barrel P30, and the sixth lens E6 to the eighth lens E8 are accommodated in the fourth lens barrel P40.

[0134] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S5 of the second lens is concave, and the image side surface S6 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S12 of the third lens is convex, and the image side surface S13 of the third lens is concave. The fourth lens E4 has negative focal power, the object side surface S14 of the fourth lens is convex, and the image side surface S15 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S16 of the fifth lens is convex, and the image side surface S17 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S19 of the sixth lens is concave, and the image side surface S20 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S21 of the seventh lens is concave, and the image side surface S22 of the seventh lens is concave. The eighth lens E8 has negative refractive power, the object-side surface S23 of the eighth lens is a convex surface, and the image-side surface S24 of the eighth lens is a concave surface.

[0135] Table 8 shows the basic structural parameters of the optical imaging lens of Example 7, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0136] Table 8

[0137] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Aspheric 13.0857 0.9296 1.55 56.1 0.0000 S2 Aspheric 24.4991 2.3504 0.0000 S3 Spherical endless 4.8000 S4 Spherical endless 2.1626 S5 Aspheric -25.5012 0.6500 1.67 20.4 0.3229 S6 Aspheric -30.6350 1.0525 61.5946 S7 Spherical endless 0.0000 S8 Spherical endless -6.0000 S9 Spherical endless 6.0000 S10 Spherical endless 0.6500 S11 Spherical endless -0.5535 S12 Aspheric 6.2373 1.1588 1.55 56.1 0.1677 S13 Aspheric 77.3672 0.0799 -98.5000 S14 Aspheric 8.6825 0.6677 1.62 25.9 -0.3423 S15 Aspheric 3.1857 1.2769 -0.8469 S16 Aspheric 10.9544 1.2330 1.55 56.1 7.1331 S17 Aspheric -10.2597 1.6200 -7.3359 STO Spherical endless 0.0133 S19 Aspheric -14.5073 1.2100 1.67 20.4 0.0000 S20 Aspheric -6.1479 0.1000 1.3966 S21 Aspheric -9.2298 0.6697 1.57 37.4 4.2950 S22 Aspheric 10.7371 0.8199 7.2130 S23 Aspheric 7.7988 0.9848 1.54 55.7 -72.8841 S24 Aspheric 5.9689 6.0335 -1.9006 S25 Spherical endless -0.0133 S26 Spherical endless 0.2100 1.52 64.2 S27 Spherical endless 1.2742 S28 Spherical endless

[0138] Table 9 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the eighth lens are all aspherical surfaces.

[0139] Table 9

[0140]

[0141]

[0142] Fig. 22 The axial chromatic aberration curve of the optical imaging lens of Example 7 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 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.24 The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.25 The magnification chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the degree to which the focusing points of light rays of different wavelengths do not completely overlap.

[0143] according to Figure 22 to Figure 25It can be seen that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0144] Embodiment 8

[0145] like Fig.21 As shown, the optical imaging lens of the eighth embodiment of the present application is described, which differs from the seventh embodiment in that the distances and thicknesses between the various spacing elements, lenses, lens barrels, etc. are different.

[0146] Fig.21 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Embodiment 8. For the sake of brevity, some descriptions similar to those of Embodiment 7 are omitted. In this embodiment, the wall thickness of the object side end surface of the fourth lens barrel is increased, which is beneficial to reducing the risk of stress deformation of the sixth lens to the seventh lens, and ensuring the assembly stability of the optical imaging lens.

[0147] In summary, the first to eighth embodiments of the optical imaging lens respectively satisfy the relationships shown in Table 10.

[0148] Table 10

[0149] Conditional / Example 1 2 3 4 5 6 7 8 R16 / (D40m-d40m) 10.00 10.00 7.99 7.99 9.42 12.98 8.18 8.18 R15 / d7m 2.24 2.28 1.33 1.31 1.74 1.66 1.36 1.36 R14×N7×(D7m-d7m) 31.57 33.13 34.37 41.39 33.11 41.54 42.66 47.64 f7 / EP67 -7.46 -7.46 -8.25 -7.77 -7.82 -6.82 -7.24 -7.13 R13 / (D7s-d7s) -4.62 -4.40 -5.00 -4.15 -5.22 -4.16 -3.59 -3.22 R12×N6 / d6s -1.55 -1.61 -1.85 -1.80 -1.89 -1.79 -1.78 -1.78 f6 / (CP6+CT6) 9.95 9.95 13.98 13.98 13.51 13.51 12.29 12.29 f5 / (CP4+T45) 5.18 5.39 5.97 5.97 5.93 5.93 5.74 5.74 R10×N5 / d30m -2.65 -2.78 -2.44 -2.34 -2.60 -2.19 -2.43 -2.43 R9 / (D4m-d4m) 6.05 5.22 6.52 5.82 6.50 6.42 4.78 4.78 R7 / d3m 1.12 1.12 1.22 1.25 1.46 1.58 1.46 1.39 f2 / f1 -2.37 -2.37 -2.38 -2.38 -3.93 -3.93 -4.84 -4.84

[0150] Table 11 shows the effective focal lengths f1 to f8 of the lenses of the optical imaging lenses of Examples 1 to 8, in units of mm.

[0151] Table 11

[0152] Parameters / Examples 1 2 3 4 5 6 7 8 f 22.60 22.60 22.60 22.60 22.60 22.60 22.60 22.60 f1 49.15 49.15 50.10 50.10 51.00 51.00 50.10 50.10 f2 -116.52 -116.52 -119.31 -119.31 -200.25 -200.25 -242.47 -242.47 f3 13.20 13.20 12.25 12.25 11.62 11.62 12.36 12.36 f4 -10.52 -10.52 -9.69 -9.69 -8.87 -8.87 -8.60 -8.60 f5 10.67 10.67 10.62 10.62 10.45 10.45 9.91 9.91 f6 12.26 12.26 17.09 17.09 16.65 16.65 15.14 15.14 f7 -8.35 -8.35 -9.52 -9.52 -9.58 -9.58 -8.99 -8.99 f8 -34.02 -34.02 -57.00 -57.00 -46.32 -46.32 -57.73 -57.73

[0153] Table 12 lists some structural parameters of the optical imaging lenses of Examples 1 to 8, in units of mm.

[0154] Table 12

[0155]

[0156]

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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 optical imaging lens has eight lenses with optical power, and the optical imaging lens includes: A lens group, wherein the lens group includes first to eighth lenses arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, the spacer element group comprising at least a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens, and a seventh spacer element located between the seventh lens and the eighth lens and at least partially in contact with the image side surface of the seventh lens; A lens barrel group, wherein the lens group and the spacer element group are accommodated in the lens barrel group, and the lens barrel group includes a first lens barrel to a fourth lens barrel arranged in sequence from the object side to the image side of the optical imaging lens, the first lens is accommodated in the first lens barrel, the second lens is accommodated in the second lens barrel, the third lens to the fifth lens are accommodated in the third lens barrel, and the sixth lens to the eighth lens are accommodated in the fourth lens barrel; The effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element along the optical axis of the optical imaging lens satisfy the following conditions: -8.25≤f7 / EP67≤-6.82; A curvature radius R15 of the object side surface of the eighth lens and an inner diameter d7m of the image side surface of the seventh spacing element satisfy the following: 1.31≤R15 / d7m≤2.

28.

2. The optical imaging lens according to claim 1, wherein: The curvature radius R16 of the image side surface of the eighth lens, the outer diameter D40m of the image side end surface of the fourth lens barrel, and the inner diameter d40m of the image side end surface of the fourth lens barrel satisfy the following relationship: 7.99≤R16 / (D40m-d40m)≤12.

98.

3. The optical imaging lens according to claim 1, wherein: The curvature radius R14 of the image side surface of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D7m of the image side surface of the seventh spacing element, and the inner diameter d7m of the image side surface of the seventh spacing element satisfy the following: 31.57≤R14×N7×(D7m-d7m)≤47.

64.

4. The optical imaging lens according to claim 1, wherein: The curvature radius R13 of the object side surface of the seventh lens, the outer diameter D7s of the object side surface of the seventh spacing element, and the inner diameter d7s of the object side surface of the seventh spacing element satisfy the following: -5.22≤R13 / (D7s-d7s)≤-3.

22.

5. The optical imaging lens according to claim 1, wherein: The curvature radius R12 of the image side surface of the sixth lens, the refractive index N6 of the sixth lens, and the inner diameter d6s of the object side surface of the sixth spacer element satisfy the following: -1.89≤R12×N6 / d6s≤-1.

55.

6. The optical imaging lens according to claim 1, wherein: The effective focal length f6 of the sixth lens, the center thickness CT6 of the sixth lens on the optical axis, and the maximum thickness CP6 of the sixth spacing element along the optical axis satisfy the following: 9.95≤f6 / (CP6+CT6)≤13.

98.

7. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth spacer element along the optical axis, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy the following: 5.18≤f5 / (CP4+T45)≤5.

97.

8. The optical imaging lens according to claim 1, wherein: The curvature radius R10 of the image side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d30m of the image side end surface of the third lens barrel satisfy the following: -2.78≤R10×N5 / d30m≤-2.

19.

9. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The curvature radius R9 of the object side surface of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the inner diameter d4m of the image side surface of the fourth spacer element satisfy the following: 4.78≤R9 / (D4m-d4m)≤6.

52.

10. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The curvature radius R7 of the object side surface of the fourth lens and the inner diameter d3m of the image side surface of the third spacer element satisfy the following: 1.12≤R7 / d3m≤1.

58.

11. The optical imaging lens according to claim 1, wherein: The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy the following: -4.84≤f2 / f1≤-2.

37.

12. The optical imaging lens according to claim 1, wherein: 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 seventh lens has negative focal power, the object side surface of the seventh lens is concave, 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.

13. The optical imaging lens according to claim 1, wherein: The second lens has negative optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is convex. The third lens has positive optical 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 optical power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave. The fifth lens has positive optical power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is convex. The sixth lens has positive optical power, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex.

Images