Optical imaging lens

Abstract

The utility model provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a plurality of annular elements, the lens group comprises 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 focal power of the first lens, the third lens and the seventh lens is positive, and the focal power of the second lens, the sixth lens and the eighth lens is negative; when the following conditions are satisfied: 15.0 lt; l / (CT2 + T12) lt; 25.0, 4.7 lt, 25.0, 4.7 lt; l / T781t; when the focal length is 6.0, the effective focal length f2 of the second lens, the effective focal length f8 of the eighth lens, the inner diameter d2s of the object side surface of the second annular element and the inner diameter d7s of the object side surface of the seventh annular element satisfy 1.0 mmlt; (d7s-d2s) / (f2 / f8) lt; and the thickness is 2.5 mm. The optical imaging lens solves the problem that an optical imaging lens in the prior art is poor in assembling stability.

Description

Technical Field

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

[0002] At present, the development of optical imaging technology is in full swing. With the increase in market demand, optical imaging lenses can be widely used in various devices. Especially in portable electronic products, users have increasingly stringent requirements for optical imaging lenses used in portable electronic products. At present, the imaging quality of the lens has been greatly improved by optimizing and adjusting the stray light, astigmatism and light leakage between lenses in the optical imaging lens. However, there is still a large deviation in the assembly stability, especially the imaging quality of the lens with multiple lenses is greatly affected by the assembly stability.

[0003] That is to say, the optical imaging lens in the prior art has the problem of poor assembly stability. Utility Model Content

[0004] The main purpose of the utility model is to provide an optical imaging lens to solve the problem of poor assembly stability of the optical imaging lens in the prior art.

[0005] To achieve the above object, according to one aspect of the present utility model, an optical imaging lens is provided, which includes a lens barrel and a lens group and a plurality of annular elements disposed in the lens barrel. The lens group sequentially includes 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. The optical powers of the first lens, the third lens, and the seventh lens are positive, and the optical powers of the second lens, the sixth lens, and the eighth lens are negative; the plurality of annular elements include a second annular element disposed on the image side of the second lens and partially in contact with the image side surface of the second lens, a third annular element disposed on the image side of the third lens and partially in contact with the image side surface of the third lens, a fourth annular element disposed on the image side of the fourth lens and partially in contact with the image side surface of the fourth lens, a fifth annular element disposed on the image side of the fifth lens and partially in contact with the image side surface of the fifth lens, a sixth annular element disposed on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens, a seventh annular element disposed on the image side of the seventh lens and partially in contact with the image side surface of the seventh lens, and an eighth annular element disposed on the image side of the eighth lens and partially in contact with the image side surface of the eighth lens; when the distance L on the optical axis from the object side end face of the lens barrel to the image side end face of the lens barrel, the central thickness CT2 of the second lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 15.0 < L / (CT2 + T12) < 25.0, and the distance L on the optical axis from the object side end face of the lens barrel to the image side end face of the lens barrel and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.7 < L / T78 < 6.0, the effective focal length f2 of the second lens, the effective focal length f8 of the eighth lens, and the inner diameter d2s of the object side surface of the second annular element and the inner diameter d7s of the object side surface of the seventh annular element satisfy: 1.0 mm < (d7s - d2s) / (f2 / f8) < 2.5 mm.

[0006] According to another aspect of the present utility model, there is also provided an optical imaging lens, which includes a lens barrel and a lens group and a plurality of annular elements disposed in the lens barrel. The lens group sequentially includes 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. The optical powers of the first lens, the third lens, and the seventh lens are positive, and the optical powers of the second lens, the sixth lens, and the eighth lens are negative; the plurality of annular elements include a second annular element disposed on the image side of the second lens and in partial contact with the image side surface of the second lens, a third annular element disposed on the image side of the third lens and in partial contact with the image side surface of the third lens, a fourth annular element disposed on the image side of the fourth lens and in partial contact with the image side surface of the fourth lens, a fifth annular element disposed on the image side of the fifth lens and in partial contact with the image side surface of the fifth lens, a sixth annular element disposed on the image side of the sixth lens and in partial contact with the image side surface of the sixth lens, a seventh annular element disposed on the image side of the seventh lens and in partial contact with the image side surface of the seventh lens, and an eighth annular element disposed on the image side of the eighth lens and in partial contact with the image side surface of the eighth lens; the lens barrel includes a first lens barrel and a second lens barrel, the first lens barrel is adhesively bonded to the second lens barrel, the first lens is disposed in the first lens barrel, and the second lens to the eighth lens are disposed in the second lens barrel; when the distance L on the optical axis from the object side end surface of the lens barrel to the image side end surface of the lens barrel and the air interval T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.7 < L / T78 < 6.0, the minimum inner diameter d0bs of the second lens barrel, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -25.0 < d0bs / (f1 / f2) < -10.0.

[0007] Further, the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 0.5 < N1 / N2 < 1.0; the dispersion coefficient V1 of the first lens and the dispersion coefficient V2 of the second lens satisfy: 2.0 < V1 / V2 < 5.0; the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, the object side inner diameter d2s of the second annular element, and the combined focal length f12 of the first lens and the second lens satisfy: 10.0 < (V1 - V2)*d2s / f12 < 25.0.

[0008] Further, the object side inner diameter d3s of the third annular element, the object side inner diameter d4s of the fourth annular element, the object side inner diameter d5s of the fifth annular element, and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0 < (d3s + d4s + d5s) / f345 < 1.0.

[0009] Furthermore, the air interval T56 between the fifth lens and the sixth lens on the optical axis and the interval distance EP56 along the optical axis direction between the image side surface of the fifth annular element and the object side surface of the sixth annular element satisfy the following conditions: 0.5 <T56 / EP56<1.5。

[0010] Further, the spacing distance EP23 between the image side surface of the second ring element and the object side surface of the third ring element along the optical axis, the spacing distance EP34 between the image side surface of the third ring element and the object side surface of the fourth ring element along the optical axis, the spacing distance EP45 between the image side surface of the fourth ring element and the object side surface of the fifth ring element along the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy the following: 0.4<(EP23+EP34+EP45) / (CT2+CT3+CT4+CT5)<1.2.

[0011] Furthermore, an outer diameter D4s of the object side surface of the fourth annular element, an outer diameter D5s of the object side surface of the fifth annular element, a curvature radius R8 of the image side surface of the fourth lens and a curvature radius R9 of the object side surface of the fifth lens satisfy: -1.0<(D4s / D5s) / (R9 / R8)<1.0.

[0012] Furthermore, the spacing distance EP78 between the image side surface of the seventh annular element and the object side surface of the eighth annular element along the optical axis and the air spacing T78 between the seventh lens and the eighth lens on the optical axis satisfy: 0.2 <EP78 / T78<0.9。

[0013] Furthermore, the relationship between the inner diameter d7s of the object side surface of the seventh annular element and the combined focal length f78 of the seventh lens and the eighth lens is: 0.1 <d7s / f78<0.9。

[0014] Further, the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, the spacing distance EP78 between the image side surface of the seventh annular element and the object side surface of the eighth annular element along the optical axis, and the effective focal length f7 of the seventh lens satisfy: 8.0<(V7+V8)*EP78 / f7<18.0.

[0015] Further, an inner diameter d6s of the object side surface of the sixth annular element, an inner diameter d6m of the image side surface of the sixth annular element and an effective focal length f6 of the sixth lens satisfy: -1.5<(d6s+d6m) / f6<-0.2.

[0016] Further, a sum ∑CP of maximum thicknesses of the second to eighth annular elements along the optical axis and an axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens satisfy: 0.01<∑CP / TD<0.5.

[0017] Furthermore, the multiple annular elements also include a sixth auxiliary element partially abutting against the sixth annular element, and the outer diameter D6bs of the object side of the sixth auxiliary element, the inner diameter d6bs of the object side of the sixth auxiliary element and the curvature radius R12 of the image side of the sixth lens satisfy: -0.5<(D6bs-d6bs) / R12<0.5.

[0018] Furthermore, a vertical distance Yc71 from the inflection point on the object side surface of the seventh lens to the optical axis, a vertical distance Yc72 from the inflection point on the image side surface of the seventh lens to the optical axis, an inner diameter d6s of the object side surface of the sixth annular element, and an inner diameter d7m of the image side surface of the seventh annular element satisfy the following relationship: 1.2<(Yc72 / Yc71) / (d6s / d7m)<2.0.

[0019] Further, the lens barrel includes a first lens barrel and a second lens barrel, the first lens barrel is glued to the second lens barrel, the first lens is arranged in the first lens barrel, the second lens to the eighth lens are arranged in the second lens barrel, and the minimum inner diameter d0bs of the second lens barrel, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -25.0 <d0bs / (f1 / f2)<-10.0。

[0020] Further, the combined focal length f678 of the sixth lens, the seventh lens and the eighth lens, the axial distance SAGH61 between the intersection of the object side surface of the sixth lens and the optical axis to the object side vertex of the maximum outer diameter of the fifth lens, and the axial distance SAGH82 between the intersection of the image side surface of the eighth lens and the optical axis to the image side vertex of the maximum outer diameter of the eighth lens satisfy: -25.0 <f678 / (|SAGH61|+|SAGH82|)<-5.0。

[0021] Applying the technical solution of the present utility model, the optical imaging lens includes a lens barrel and a lens group and a plurality of annular elements disposed in the lens barrel. The lens group sequentially includes 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. The optical powers of the first lens, the third lens, and the seventh lens are positive, and the optical powers of the second lens, the sixth lens, and the eighth lens are negative. The plurality of annular elements include a second annular element disposed on the image side of the second lens and partially contacting the image side surface of the second lens, a third annular element disposed on the image side of the third lens and partially contacting the image side surface of the third lens, a fourth annular element disposed on the image side of the fourth lens and partially contacting the image side surface of the fourth lens, a fifth annular element disposed on the image side of the fifth lens and partially contacting the image side surface of the fifth lens, a sixth annular element disposed on the image side of the sixth lens and partially contacting the image side surface of the sixth lens, a seventh annular element disposed on the image side of the seventh lens and partially contacting the image side surface of the seventh lens, and an eighth annular element disposed on the image side of the eighth lens and partially contacting the image side surface of the eighth lens. When the distance L on the optical axis from the object-side end face of the lens barrel to the image-side end face of the lens barrel, the central thickness CT2 of the second lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 15.0 < L / (CT2 + T12) < 25.0, and the distance L on the optical axis from the object-side end face of the lens barrel to the image-side end face of the lens barrel and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.7 < L / T78 < 6.0, the effective focal length f2 of the second lens, the effective focal length f8 of the eighth lens, the inner diameter d2s of the object side surface of the second annular element, and the inner diameter d7s of the object side surface of the seventh annular element satisfy: 1.0 mm < (d7s - d2s) / (f2 / f8) < 2.5 mm.

[0022] The optical imaging lens of the present application uses eight lenses. When 15.0 < L / (CT2 + T12) < 25.0, 4.7 < L / T78 < 6.0, and 1.0 mm < (d7s - d2s) / (f2 / f8) < 2.5 mm are satisfied, the parameter relationships of the length of the lens barrel, the central thickness of the key lenses, and the air gaps between the lenses on the optical axis can be controlled to achieve a reasonable arrangement of the optical imaging lens in the space along the optical axis direction, ensuring the thinness and lightness of the optical imaging lens. At the same time, it improves the problem of assembly stability that is relatively extreme and sensitive due to the smallest air gap between the first lens and the second lens and the largest air gap between the seventh lens and the eighth lens on the optical axis, thereby reducing the influence of the key positions on the assembly stability of the entire optical imaging lens, ensuring the quality of the optical imaging lens and helping to improve the overall assembly stability. Description of the Drawings

[0023] The drawings constituting 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 on the present invention. In the drawings:

[0024] Figure 1 A dimension diagram of an optical imaging lens of an optional embodiment of the utility model is shown;

[0025] Figure 2 A schematic structural diagram of an optical imaging lens in a first state according to a first embodiment of the utility model is shown;

[0026] Figure 3 A schematic structural diagram of an optical imaging lens in a second state according to a first embodiment of the utility model is shown;

[0027] Figure 4 A schematic structural diagram of an optical imaging lens in a third state according to a first embodiment of the present utility model is shown;

[0028] Figures 5 to 8 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the first embodiment of the utility model are respectively shown;

[0029] Fig. 9 A schematic structural diagram of an optical imaging lens in a first state according to a second embodiment of the present utility model is shown;

[0030] Fig.10 A schematic structural diagram of an optical imaging lens in a second state according to a second embodiment of the present utility model is shown;

[0031] Fig.11 A schematic structural diagram of an optical imaging lens in a third state according to a second embodiment of the present utility model is shown;

[0032] Figures 12 to 15 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the second embodiment of the utility model are respectively shown;

[0033] Fig.16 A schematic structural diagram of an optical imaging lens in a first state according to a third embodiment of the present utility model is shown;

[0034] Fig.17 A schematic structural diagram of an optical imaging lens in a second state according to a third embodiment of the present utility model is shown;

[0035] Fig.18 A schematic structural diagram of an optical imaging lens in a third state according to a third embodiment of the present utility model is shown;

[0036] Figures 19 to 22The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the third embodiment of the present utility model are respectively shown;

[0037] Fig.23 A stress distribution cloud diagram is shown when (d7s-d2s) / (f2 / f8)=-2.89mm, under the premise that the optical imaging lens of an optional embodiment of the present invention satisfies L / (CT2+T12)=9.42 and L / T78=4.31;

[0038] Fig.24 A stress distribution cloud diagram is shown when (d7s-d2s) / (f2 / f8)=3.54mm, under the premise that the optical imaging lens of an optional embodiment of the present invention satisfies L / (CT2+T12)=33.62 and L / T78=8.72;

[0039] Fig.25 A stress distribution cloud diagram is shown when (d7s-d2s) / (f2 / f8)=2.04mm, under the premise that the optical imaging lens of an optional embodiment of the utility model satisfies L / (CT2+T12)=24.84 and L / T78=4.98.

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

[0041] P01, first lens barrel; P02, second 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 Image side surface; E6, sixth lens; S11, object side surface of sixth lens; S12, image side surface of sixth lens; E7, seventh lens; S13, object side surface of seventh lens; S14, image side surface of seventh lens; E8, eighth lens; S15, object side surface of eighth lens; S16, image side surface of eighth lens; P2, second annular element; P3, third annular element; P4, fourth annular element; P5, fifth annular element; P6, sixth annular element; P7, seventh annular element; P8, eighth annular element. DETAILED DESCRIPTION

[0042] 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 utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0044] In the present utility model, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are generally in reference to the direction shown in the drawings, or in reference to the vertical, perpendicular or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present utility model.

[0045] In order to solve the problem of poor assembly stability existing in the optical imaging lens in the prior art, the present utility model provides an optical imaging lens.

[0046] As Figures 1 to 25 shown, in an alternative embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a plurality of annular elements disposed in the lens barrel. The lens group sequentially includes 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. The optical powers of the first lens, the third lens and the seventh lens are positive, and the optical powers of the second lens, the sixth lens and the eighth lens are negative; the plurality of annular elements include a second annular element disposed on the image side of the second lens and in partial contact with the image side surface of the second lens, a third annular element disposed on the image side of the third lens and in partial contact with the image side surface of the third lens, a fourth annular element disposed on the image side of the fourth lens and in partial contact with the image side surface of the fourth lens, a fifth annular element disposed on the image side of the fifth lens and in partial contact with the image side surface of the fifth lens, a sixth annular element disposed on the image side of the sixth lens and in partial contact with the image side surface of the sixth lens, a seventh annular element disposed on the image side of the seventh lens and in partial contact with the image side surface of the seventh lens, an eighth annular element disposed on the image side of the eighth lens and in partial contact with the image side surface of the eighth lens; when the distance L on the optical axis from the object side end face of the lens barrel to the image side end face of the lens barrel, the central thickness CT2 of the second lens on the optical axis and the air interval T12 between the first lens and the second lens on the optical axis satisfy: 15.0 < L / (CT2 + T12) < 25.0, and the distance L on the optical axis from the object side end face of the lens barrel to the image side end face of the lens barrel and the air interval T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.7 < L / T78 < 6.0, the effective focal length f2 of the second lens, the effective focal length f8 of the eighth lens, and the inner diameter d2s of the object side surface of the second annular element and the inner diameter d7s of the object side surface of the seventh annular element satisfy: 1.0 mm < (d7s - d2s) / (f2 / f8) < 2.5 mm.

[0047] The optical imaging lens of the present application adopts eight lenses. When 15.0 < L / (CT2 + T12) < 25.0, 4.7 < L / T78 < 6.0, and 1.0 mm < (d7s - d2s) / (f2 / f8) < 2.5 mm are satisfied, the parameter relationships of the length of the lens barrel, the central thickness of the key lenses, and the air gap of the lenses on the optical axis can be controlled to achieve a reasonable combination of the optical imaging lens in the space along the optical axis direction, ensuring the thinness and lightness of the optical imaging lens; at the same time, it improves the problem of assembly stability that is relatively extreme and sensitive due to the minimum air gap between the first lens and the second lens on the optical axis and the maximum air gap between the seventh lens and the eighth lens on the optical axis, thereby reducing the influence of the key positions on the assembly stability of the entire optical imaging lens, ensuring the quality of the optical imaging lens and helping to improve the overall assembly stability.

[0048] In addition, Fig.23 It shows the stress distribution nephogram of the optical imaging lens when an axial assembly force of 5 N is applied under the premise of satisfying L / (CT2 + T12) = 9.42 and L / T78 = 4.31, and setting (d7s - d2s) / (f2 / f8) = -2.89 mm. It can be seen from the figure that the average stress value borne by the key part positions is about 4.13295 N. Fig.24 It shows the stress distribution nephogram of the optical imaging lens when an axial assembly force of 5 N is applied under the premise of satisfying L / (CT2 + T12) = 33.62 and L / T78 = 8.72, and setting (d7s - d2s) / (f2 / f8) = 3.54 mm. It can be seen from the figure that the average stress value borne by the key part positions is about 3.84290 N. Fig.25 It shows the stress distribution nephogram of the optical imaging lens when an axial assembly force of 5 N is applied under the premise of satisfying L / (CT2 + T12) = 24.84 and L / T78 = 4.98, and setting (d7s - d2s) / (f2 / f8) = 2.04 mm. It can be seen from the figure that the average stress value borne by the key part positions is about 2.41834 N.

[0049] By comparing Figure 23 to Figure 25 and Table 1-1 below, it can be known that Fig.25 the stress borne by the key positions is relatively small, alleviating the impact on the lens during assembly. From this, it can be further explained that by restricting 15.0 < L / (CT2 + T12) < 25.0 and 4.7 < L / T78 < 6.0, and further restricting 1.0 mm < (d7s - d2s) / (f2 / f8) < 2.5 mm, the impact force on the lens during assembly can be reduced, which is beneficial to improving the assembly stability of the optical imaging lens.

[0050] Conditions / Examples Example 1 Example 2 Example 3 15.0<L / (CT2+T12)<25.0 9.42 33.62 24.84 4.7<L / T78<6.0 4.31 8.72 4.98 <h2 style=";text-align:left;direction:ltr">1.0<(d7s-d2s) / (f2 / f8)<2.5<h2 style=";text-align:left;direction:ltr"> -2.89 3.54 2.04 Axial application 5N 4.13295N 3.84290N 2.41834N

[0051] Table 1-1

[0052] In this embodiment, the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 0.5 < N1 / N2 < 1.0; the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: 2.0 < V1 / V2 < 5.0; the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the inner diameter d2s of the object side surface of the second annular element, and the combined focal length f12 of the first lens and the second lens satisfy: 10.0 < (V1 - V2) * d2s / f12 < 25.0. By controlling the above conditional expressions, the refractive index and Abbe number of the first lens and the second lens are effectively controlled. By changing the inner diameter of the second annular element and the combined focal length of the first lens and the second lens, the assembly stability of the optical imaging lens can be effectively enhanced, and the imaging performance can be improved.

[0053] In this embodiment, the inner diameter d3s of the object side surface of the third annular element, the inner diameter d4s of the object side surface of the fourth annular element, the inner diameter d5s of the object side surface of the fifth annular element, and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0 < (d3s + d4s + d5s) / f345 < 1.0. By controlling the above conditional expressions, the inner diameters of the third annular element, the fourth annular element, and the fifth annular element are effectively controlled, ensuring the processability of the three annular elements. And by adjusting the combined focal length of the third lens, the fourth lens, and the fifth lens, the assembly stability is enhanced while ensuring imaging stability.

[0054] In this embodiment, the air gap T56 between the fifth lens and the sixth lens on the optical axis and the distance EP56 between the image side surface of the fifth annular element and the object side surface of the sixth annular element along the optical axis satisfy: 0.5 < T56 / EP56 < 1.5. By controlling the air gap between the fifth lens and the sixth lens on the optical axis, it is ensured that an annular element can be inserted between the lenses. The more annular elements are selected, the greater the space for structural improvement. By controlling the distance between the image side surface of the fifth annular element and the object side surface of the sixth annular element along the optical axis and changing the thickness of the sixth lens, it is beneficial to improve the assembly stability of the lens.

[0055] In the present embodiment, the distance EP23 between the image side surface of the second annular element and the object side surface of the third annular element in the optical axis direction, the distance EP34 between the image side surface of the third annular element and the object side surface of the fourth annular element in the optical axis direction, the distance EP45 between the image side surface of the fourth annular element and the object side surface of the fifth annular element in the optical axis direction, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.4 < (EP23 + EP34 + EP45) / (CT2 + CT3 + CT4 + CT5) < 1.2. By controlling the distance between the image side surface of the second annular element and the object side surface of the third annular element in the optical axis direction, it helps to control the edge thickness of the third lens and reduce the difficulty of forming the third lens; by controlling the distance between the image side surface of the third annular element and the object side surface of the fourth annular element in the optical axis direction, it helps to control the edge thickness of the fourth lens and reduce the difficulty of forming the fourth lens; by controlling the distance between the image side surface of the fourth annular element and the object side surface of the fifth annular element in the optical axis direction, it helps to control the edge thickness of the fifth lens and reduce the difficulty of forming the fifth lens; by controlling the central thicknesses of the second lens to the fifth lens, it is beneficial to miniaturize the overall volume and ensure that each lens can be assembled normally.

[0056] In the present embodiment, the outer diameter D4s of the object side surface of the fourth annular element, the outer diameter D5s of the object side surface of the fifth annular element, the radius of curvature R8 of the image side surface of the fourth lens, and the radius of curvature R9 of the object side surface of the fifth lens satisfy: -1.0 < (D4s / D5s) / (R9 / R8) < 1.0. By restricting this conditional expression, it is possible to control the outer diameters of the object side surfaces of the fourth annular element and the fifth annular element and the radii of curvature of the image side surfaces of the fourth lens and the fifth lens respectively, ensuring the concavity and convexity of the image side surfaces of the fourth lens and the fifth lens, and affecting the light emission state through structural improvement, thereby affecting the imaging effect of the optical imaging lens.

[0057] In the present embodiment, the distance EP78 between the image side surface of the seventh annular element and the object side surface of the eighth annular element in the optical axis direction and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 0.2 < EP78 / T78 < 0.9. By controlling the distance between the image side surface of the seventh annular element and the object side surface of the eighth annular element in the optical axis direction, the size of the eighth lens is improved, which is beneficial to meeting the control requirements of the lens appearance. By controlling the air gap between the seventh lens and the eighth lens on the optical axis, the risk of barrel forming is reduced.

[0058] In this embodiment, the following condition is satisfied between the object-side inner diameter d7s of the seventh annular element and the combined focal length f78 of the seventh lens and the eighth lens: 0.1 < d7s / f78 < 0.9. By controlling the object-side inner diameter of the seventh annular element, the combined focal length of the seventh lens and the eighth lens is improved, effectively ensuring the uniformity of the seventh lens and the eighth lens, contributing to the lens forming, and improving the lens forming yield.

[0059] In this embodiment, the following condition is satisfied between the dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, the axial spacing distance EP78 between the image side of the seventh annular element and the object side of the eighth annular element, and the effective focal length f7 of the seventh lens: 8.0 < (V7 + V8) * EP78 / f7 < 18.0. By adjusting the dispersion coefficient of the seventh lens and the dispersion coefficient of the eighth lens, the astigmatism degree of the optical imaging lens can be effectively controlled, and the axial spacing distance between the image side of the seventh annular element and the object side of the eighth annular element along the optical axis and the effective focal length of the seventh lens can be controlled, which is beneficial to improving the assembly stability of the lens and improving the problem of low yield caused by the mating amount.

[0060] In this embodiment, the following condition is satisfied between the object-side inner diameter d6s of the sixth annular element, the image-side inner diameter d6m of the sixth annular element, and the effective focal length f6 of the sixth lens: -1.5 < (d6s + d6m) / f6 < -0.2. By controlling the above conditional formula, the object-side inner diameter and the image-side inner diameter of the sixth annular element are effectively controlled, and at the same time, the effective focal length of the sixth lens is adjusted to determine the thickness of the sixth annular element, which is beneficial to improving the assembly stability.

[0061] In this embodiment, the following condition is satisfied between the sum ∑CP of the maximum thicknesses of the second annular element to the eighth annular element along the optical axis and the axial distance TD from the object side of the first lens to the image side of the eighth lens: 0.01 < ∑CP / TD < 0.5. By controlling the ratio of the sum of the maximum thicknesses of the second annular element to the eighth annular element along the optical axis to the axial distance from the object side of the first lens to the image side of the eighth lens within this range, it is helpful to control the total thickness of the first lens to the eighth lens, limit the length of the lens barrel, compress the total length of the optical imaging lens, reduce the volume, and thus contribute to achieving miniaturization.

[0062] In this embodiment, the plurality of annular elements further includes a sixth auxiliary element that is partially in contact with the sixth annular element. The following relationship is satisfied among the outer diameter D6bs of the object side surface of the sixth auxiliary element, the inner diameter d6bs of the object side surface of the sixth auxiliary element, and the radius of curvature R12 of the image side surface of the sixth lens: -0.5 < (D6bs - d6bs) / R12 < 0.5. By controlling the above conditional expression, the difference between the inner and outer diameters of the sixth auxiliary element is effectively controlled, ensuring the processability of the sixth auxiliary element. At the same time, the ratio of its radius of curvature to the object side surface of the sixth lens makes the distribution of the sixth lens more uniform and the thickness reasonable, which is beneficial to processability and also beneficial to reducing the total length of the lens. It helps to reduce the sensitivity of the sixth lens and enhance the light passing rate.

[0063] In this embodiment, the following relationship is satisfied among the perpendicular distance Yc71 from the inflection point on the object side surface of the seventh lens to the optical axis, the perpendicular distance Yc72 from the inflection point on the image side surface of the seventh lens to the optical axis, the inner diameter d6s of the object side surface of the sixth annular element, and the inner diameter d7m of the image side surface of the seventh annular element: 1.2 < (Yc72 / Yc71) / (d6s / d7m) < 2.0. By controlling the above conditional expression, the perpendicular distance from the inflection point on the object side surface of the seventh lens to the optical axis and the perpendicular distance from the inflection point on the image side surface of the seventh lens to the optical axis are effectively controlled, ensuring the structural feasibility of the seventh lens. And by controlling the ratio of the inner diameter of the object side surface of the sixth annular element to the inner diameter of the image side surface of the seventh annular element, it is ensured that the outer diameter of the seventh lens meets the assembly requirements, enabling the seventh lens to completely transmit and effectively converge light, effectively intercepting the reflection optical path and the reflection area, and ensuring the imaging quality of the optical imaging lens.

[0064] In this embodiment, the lens barrel includes a first lens barrel and a second lens barrel. The first lens barrel and the second lens barrel are adhesively bonded. The first lens is disposed in the first lens barrel, and the second lens to the eighth lens are disposed in the second lens barrel. The following relationship is satisfied among the minimum inner diameter d0bs of the second lens barrel, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens: -25.0 < d0bs / (f1 / f2) < -10.0. By controlling the ratio of the effective focal length of the first lens to the effective focal length of the second lens and the ratio to the minimum inner diameter of the second lens barrel within a reasonable numerical range, the processability and installation feasibility of the second lens are ensured, and the distribution of the optical power of the lens is made reasonable, which is beneficial to the realization of small aberration of the optical imaging lens.

[0065] In this embodiment, the combined focal length f678 of the sixth lens, the seventh lens, and the eighth lens, the axial distance SAGH61 between the intersection of the object side surface of the sixth lens and the optical axis and the object side vertex of the maximum outer diameter of the fifth lens, and the axial distance SAGH82 between the intersection of the image side surface of the eighth lens and the optical axis and the image side vertex of the maximum outer diameter of the eighth lens satisfy: -25.0 < f678 / (|SAGH61| + |SAGH82|) < -5.0. By controlling the above conditional formula, the combined focal length of the sixth lens, the seventh lens, and the eighth lens is controlled, which is beneficial to compensating for the spherical aberration of the three lenses; at the same time, the ratio of the combined focal length of the sixth lens, the seventh lens, and the eighth lens to the sum of the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the object side vertex of the maximum outer diameter of the fifth lens and the axial distance between the intersection of the image side surface of the eighth lens and the optical axis and the image side vertex of the maximum outer diameter of the eighth lens is controlled within a reasonable range, which is beneficial to the improvement of the overall lens, more reasonably distributes the optical power of the lens, and realizes the optimization of the lens processability.

[0066] As Figures 1 to 25 shown, in another alternative embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a plurality of annular elements disposed in the lens barrel. The lens group sequentially includes 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. The optical powers of the first lens, the third lens, and the seventh lens are positive, and the optical powers of the second lens, the sixth lens, and the eighth lens are negative; the plurality of annular elements include a second annular element disposed on the image side of the second lens and in partial contact with the image side surface of the second lens, a third annular element disposed on the image side of the third lens and in partial contact with the image side surface of the third lens, a fourth annular element disposed on the image side of the fourth lens and in partial contact with the image side surface of the fourth lens, a fifth annular element disposed on the image side of the fifth lens and in partial contact with the image side surface of the fifth lens, a sixth annular element disposed on the image side of the sixth lens and in partial contact with the image side surface of the sixth lens, a seventh annular element disposed on the image side of the seventh lens and in partial contact with the image side surface of the seventh lens, and an eighth annular element disposed on the image side of the eighth lens and in partial contact with the image side surface of the eighth lens; the lens barrel includes a first lens barrel and a second lens barrel, the first lens barrel is adhesively bonded to the second lens barrel, the first lens is disposed in the first lens barrel, and the second lens to the eighth lens are disposed in the second lens barrel; when the distance L on the optical axis between the object side end surface of the lens barrel and the image side end surface of the lens barrel and the air interval T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.7 < L / T78 < 6.0, the minimum inner diameter d0bs of the second lens barrel, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -25.0 < d0bs / (f1 / f2) < -10.0.

[0067] The optical imaging lens of the present application adopts eight lenses. When 4.7 < L / T78 < 6.0 and 25.0 < d0bs / (f1 / f2) < -10.0 are satisfied, the parameter relationships of the length of the lens barrel, the central thickness of the key lens, and the air gap of the lens on the optical axis can be controlled to achieve a reasonable combination of the optical imaging lens in the space along the optical axis direction, ensuring the thinness and lightness of the optical imaging lens; at the same time, the ratio of the effective focal length of the first lens to the effective focal length of the second lens to the minimum inner diameter of the second lens barrel can be controlled within a reasonable numerical range to ensure the feasibility of processing and installation of each lens in the second lens barrel and ensure a reasonable distribution of the optical power of the lens, which is beneficial to the realization of small aberration.

[0068] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0069] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0070] The optical imaging lens in the present application may adopt multiple lenses, such as the eight lenses mentioned above. In the present application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0071] 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 embodiment, the optical imaging lens is not limited to including eight lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0072] Figure 1 The structural schematic diagram of an optical imaging lens of the present application is shown, in which Figure 1 parameters such as D4s, d5s, d4s, d2s, d3s, SAGH61, SAGH82, EP23, EP34, EP45, EP56, EP78, L, d0bs, d6s, D5s, d6m, d7m, d7s are marked to clearly and intuitively understand the meaning of the parameters. For the convenience of the optical imaging lens and the specific surface type, these parameters will no longer be shown in the drawings when specific embodiments are described later.

[0073] 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.

[0074] It should be noted that in the following embodiments, there are a first state, a second state and a third state, and in the first state, the second state and the third state of the same embodiment, the parameters such as the curvature radius, the center thickness of the first lens to the eighth lens, the spacing distance between the lenses and the coefficient of the higher order terms are the same, but the parameters such as the thickness, the inner diameter and the outer diameter of the lens barrel, the first ring element to the eighth ring element and the shape of some lenses are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0075] It should be noted that any one of the following embodiments 1 to 3 is applicable to all embodiments of the present application.

[0076] Embodiment 1

[0077] like Figures 2 to 8 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 Embodiment 1 in a first state. Figure 3 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens in the first embodiment in the second state. Figure 4 A schematic structural diagram of the optical imaging lens of Embodiment 1 in a third state is shown.

[0078] like Figures 2 to 4 As shown, the optical imaging lens comprises a lens barrel, a lens group and a plurality of annular elements arranged in the lens barrel, the lens barrel is composed of a first lens barrel P01 and a second lens barrel P02, the second lens barrel P02 is located on the image side of the first lens barrel P01 and the two are glued. A first lens E1 is arranged in the first lens barrel P01, and a second lens E2, a second annular element P2, a third lens E3, a third annular element P3, a fourth lens E4, a fourth annular element P4, a fifth lens E5, a fifth annular element P5, a sixth lens E6, a sixth annular element P6, a sixth auxiliary element, a seventh lens E7, a seventh annular element P7, a seventh auxiliary element, an eighth lens and an eighth annular element P8 are arranged in the second lens barrel P02 in sequence from the object side to the image side.

[0079] like Figure 2As shown, in the first state of the optical imaging lens, the sixth auxiliary element is P6b, and the seventh auxiliary element is a combination of P7b and P7c. The object side surface S1 of the first lens partially abuts against the first lens barrel P01, and the image side surface S2 of the first lens partially abuts against the object side end surface of the second lens barrel P02. The object side surface and the image side surface of the second annular element P2 partially abut against 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 the image side surface of the third annular element P3 partially abut against 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 the image side surface of the fourth annular element P4 partially abut against 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 the image side surface of the fifth annular element P5 partially abut against 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 the image side surface of the sixth annular element P6 are respectively in contact with the image side surface S12 of the sixth lens and the object side surface portion of the sixth auxiliary element, and the image side surface of the sixth auxiliary element is partially in contact with the object side surface S13 of the seventh lens. The object side surface and the image side surface of the seventh annular element P7 are respectively in contact with the image side surface S14 of the seventh lens and the object side surface portion of the seventh auxiliary element, and the image side surface of the seventh auxiliary element is partially in contact with the object side surface S15 of the eighth lens. The eighth annular element P8 is simultaneously in contact with the image side surface S16 of the eighth lens and the inner wall surface portion of the second lens barrel P02.

[0080] like Figure 3 As shown, in the second state of the optical imaging lens, the sixth auxiliary element is a combination of P6b and P6c, and the seventh auxiliary element is P7b. The abutment mode of each annular element is the same as that in the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0081] like Figure 4 As shown, in the third state of the optical imaging lens, the plurality of annular elements further include a fifth auxiliary element, the fifth auxiliary element is located on the image side of the fifth annular element P5 and partially abuts against the image side surface of the fifth annular element P5, and the image side surface of the fifth auxiliary element partially abuts against the object side surface S11 of the sixth lens. The fifth auxiliary element is a combination of P5b and P5c. The sixth auxiliary element is P6b, and the seventh auxiliary element is a combination of P7b and P7c. The abutment manner of the remaining annular elements is the same as that of the first state, and the relevant description in the first state may be referred to, which will not be repeated here.

[0082] In summary, the structural parameters of the optical imaging lens of Example 1 in the first state 1-1, the second state 1-2 and the third state 1-3 are shown in Table 1. (Unit: mm)

[0083] Status / Parameters d2s d3s d4s D4s d5s D5s d6s d6m d7s d7m 1-1 4.2200 4.1400 4.7000 6.8000 6.2505 9.3200 8.5537 10.2115 10.5561 11.9582 1-2 4.2323 4.1520 4.7173 8.7000 6.1538 9.5600 8.5494 8.5494 9.3109 12.6200 1-3 4.2240 4.1448 4.7166 8.9000 5.7592 9.2000 8.5536 10.2115 10.5561 10.5561 Status / Parameters EP23 EP34 EP45 EP56 EP78 L d0bs |SAGH61| |SAGH82| ∑CP 1-1 0.3667 0.4619 0.7669 0.8160 1.2533 9.2700 4.9158 1.1040 2.0899 1.4185 1-2 0.3667 0.4603 0.7675 0.8658 0.6937 9.2500 4.9099 1.0357 2.0899 1.6982 1-3 0.3797 0.4473 0.5499 1.0335 1.2503 9.1769 4.9099 0.9036 2.0899 1.4295

[0084] Table 1

[0085] 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 concave surface. The object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a convex 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 concave surface, and the image side surface S16 of the eighth lens is a concave surface.

[0086] In Embodiment 1, the effective focal length f of the optical imaging lens is 8.64 mm, the effective focal length f1 of the first lens is 9.19 mm, the effective focal length f2 of the second lens is -22.64 mm, the effective focal length f3 of the third lens is 37.73 mm, the effective focal length f4 of the fourth lens is -39.62 mm, the effective focal length f5 of the fifth lens is 25.28 mm, the effective focal length f6 of the sixth lens is -16.41 mm, the effective focal length f7 of the seventh lens is 8.34 mm, the effective focal length f8 of the eighth lens is -7.30 mm, the combined focal length f12 of the first lens and the second lens is 13.82 mm, the combined focal length f23 of the second lens and the third lens is -54.54 mm, the combined focal length f17 of the third lens and the fourth lens is -13.82 mm, the combined focal length f24 of the second lens and the third lens is -13.82 mm, the combined focal length f30 of the third lens and the fourth lens is -13.82 mm, the combined focal length f41 of the third lens and the fourth lens is -13.82 mm, the combined focal length f50 of the third lens and the fourth lens is -13.82 mm, the combined focal length f61 of the third lens and the fourth lens is -13.82 mm, the combined focal length f72 of the third lens and the fourth lens is -13.82 mm, the combined focal length f33 of the third lens and the fourth lens is -13.82 mm, the combined focal length f34 of the third lens and the fourth lens is -13.82 mm, the combined focal length f35 of the third lens and the fourth lens is -13.82 mm, the combined focal length f36 of the third lens and the fourth lens is -13.82 mm, the combined focal length f37 of the third lens and the fourth lens is -13.82 mm, the combined focal The combined focal length f34 is 430.15mm, the combined focal length f45 of the fourth lens and the fifth lens is 66.23mm, the combined focal length f56 of the fifth lens and the sixth lens is -52.25mm, the combined focal length f67 of the sixth lens and the seventh lens is 16.94mm, the combined focal length f78 of the seventh lens and the eighth lens is 30.85mm, the combined focal length f345 of the third lens, the fourth lens and the fifth lens is 24.91mm, the combined focal length f678 of the sixth lens, the seventh lens and the eighth lens is -18.64mm, the vertical distance Yc71 from the inflection point on the object side surface of the seventh lens to the optical axis is 2.41mm, and the vertical distance Yc72 from the inflection point on the image side surface of the seventh lens to the optical axis is 2.81mm.

[0087] Table 2 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.

[0088]

[0089] Table 2

[0090] In the first embodiment, the object side surface and the image side surface of the first lens to the eighth lens 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:

[0091]

[0092] 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 1; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 3 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 S1-S16 in Example 1.

[0093] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.1957E-02 -1.0635E-02 -3.9438E-03 -1.0101E-03 -1.9870E-04 -4.6684E-06 1.0036E-05 S2 -6.3804E-02 7.3374E-03 -1.6453E-03 -7.1278E-04 5.6021E-04 1.1791E-04 1.3256E-05 S3 1.7864E-02 2.3133E-02 -1.0886E-04 -6.4513E-04 4.5118E-04 1.5658E-04 3.5908E-05 S4 4.6034E-02 1.6918E-02 1.0522E-03 -1.0104E-03 -6.3701E-04 -2.1212E-04 -3.4990E-05 S5 -5.4381E-02 3.4777E-02 1.2101E-02 1.5231E-03 -2.6842E-04 -1.2485E-04 -8.1927E-06 S6 -5.6734E-02 2.1214E-02 9.6486E-03 2.1200E-03 4.3702E-04 1.5115E-04 8.7028E-05 S7 -3.1715E-01 -1.3947E-02 -4.1083E-04 -2.2483E-04 -3.1358E-04 -6.1292E-05 2.8702E-05 S8 -3.8248E-01 1.2010E-02 6.9455E-03 1.5387E-03 1.2385E-03 1.6282E-04 1.0529E-04 S9 -3.2088E-01 -7.5096E-03 3.4318E-03 1.4679E-03 2.3084E-03 -4.1348E-04 -4.2931E-04 S10 -4.7910E-01 -2.6431E-02 1.2610E-02 6.0144E-03 4.7164E-03 2.8600E-04 -5.7618E-04 S11 -2.7511E-01 -2.3255E-01 1.2460E-01 -1.4141E-02 9.7746E-03 3.7683E-04 3.2733E-03 S12 -1.2338E+00 3.6416E-01 2.1751E-03 -4.2045E-02 1.0262E-03 1.6699E-02 -3.7254E-03 S13 -6.1506E+00 9.5221E-01 1.0866E-02 -3.5958E-03 -3.1271E-02 1.6133E-02 -4.4041E-03 S14 -4.1086E+00 2.0278E-01 1.3391E-01 -5.1478E-02 2.6961E-02 -1.5428E-02 8.2342E-03 S15 -2.1530E+00 1.4849E+00 -6.8177E-01 2.7518E-01 -1.1490E-01 3.8088E-02 -9.7125E-03 S16 -8.0030E+00 2.0383E+00 -5.8192E-01 2.2551E-01 -8.5344E-02 2.5045E-02 -2.8574E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.1219E-05 1.7450E-06 1.3114E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -8.2831E-06 -2.7186E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -5.7101E-06 -2.8886E-05 7.1629E-07 4.3529E-07 2.9671E-06 0.0000E+00 0.0000E+00 S4 -1.3148E-05 -1.3970E-05 -1.1978E-05 -6.5735E-06 -4.1890E-06 0.0000E+00 0.0000E+00 S5 -1.5119E-06 -1.0568E-05 -9.9237E-06 -6.8371E-06 -2.4854E-06 0.0000E+00 0.0000E+00 S6 2.0843E-05 5.8114E-06 -8.6058E-06 -6.2028E-06 -8.0465E-06 0.0000E+00 0.0000E+00 S7 2.7806E-05 1.1118E-05 9.0219E-06 -2.6260E-06 -1.2353E-07 -3.4660E-06 -6.9022E-07 S8 -3.6973E-05 1.1828E-06 -3.0708E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -3.4188E-04 -1.0947E-04 -3.2347E-05 -9.2470E-07 2.3376E-06 0.0000E+00 0.0000E+00 S10 -5.6945E-04 -2.8402E-04 -1.0587E-04 -2.3355E-05 1.5652E-06 0.0000E+00 0.0000E+00 S11 -1.6999E-03 -9.3559E-04 -1.0598E-03 -2.6096E-04 -7.8467E-05 9.6328E-05 6.7709E-05 S12 -4.3405E-03 8.7108E-04 5.8369E-04 -4.2209E-05 -4.5164E-04 1.4420E-04 2.8678E-05 S13 2.8264E-03 -1.0990E-03 -2.5436E-04 -3.7530E-04 2.4443E-04 4.1431E-05 2.7558E-05 S14 -1.5085E-03 1.7574E-03 -8.8998E-04 7.8983E-04 -2.2554E-04 7.0890E-05 -9.8572E-05 S15 -2.1383E-03 8.5507E-04 1.3761E-03 -2.1843E-03 1.3944E-03 -5.4108E-04 1.1628E-04 S16 1.4338E-02 -4.1657E-03 9.5068E-04 -2.4728E-03 1.9688E-03 -6.1324E-04 1.1051E-04

[0094] Table 3

[0095] Figure 5 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 6 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 7 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 8 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.

[0096] according to Figures 5 to 8 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0097] Embodiment 2

[0098] like Figures 9 to 15 As shown, the optical imaging lens of the second embodiment is described. Fig. 9 FIG. 1 shows a schematic structural diagram of the optical imaging lens of Embodiment 2 in a first state. Fig.10 FIG. 2 shows a schematic structural diagram of the optical imaging lens of Embodiment 2 in a second state. Fig.11 A schematic structural diagram of the optical imaging lens of the second embodiment in a third state is shown.

[0099] like Figures 9 to 11As shown, the optical imaging lens comprises a lens barrel, a lens group and a plurality of annular elements arranged in the lens barrel, the lens barrel is composed of a first lens barrel P01 and a second lens barrel P02, the second lens barrel P02 is located on the image side of the first lens barrel P01 and the two are glued. A first lens E1 is arranged in the first lens barrel P01, and a second lens E2, a second annular element P2, a third lens E3, a third annular element P3, a fourth lens E4, a fourth annular element P4, a fifth lens E5, a fifth annular element P5, a sixth lens E6, a sixth annular element P6, a sixth auxiliary element, a seventh lens E7, a seventh annular element P7, an eighth lens and an eighth annular element P8 are arranged in the second lens barrel P02 in sequence from the object side to the image side.

[0100] like Fig. 9 As shown, in the first state of the optical imaging lens, the sixth auxiliary element is P6b, and the seventh auxiliary element is a combination of P7b and P7c. The object side surface S1 of the first lens partially abuts against the first lens barrel P01, and the image side surface S2 of the first lens partially abuts against the object side end surface of the second lens barrel P02. The object side surface and the image side surface of the second annular element P2 partially abut against 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 the image side surface of the third annular element P3 partially abut against 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 the image side surface of the fourth annular element P4 partially abut against 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 the image side surface of the fifth annular element P5 partially abut against 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 the image side surface of the sixth annular element P6 are respectively in contact with the image side surface S12 of the sixth lens and the object side surface portion of the sixth auxiliary element, and the image side surface of the sixth auxiliary element is partially in contact with the object side surface S13 of the seventh lens. The object side surface and the image side surface of the seventh annular element P7 are respectively in contact with the image side surface S14 of the seventh lens and the object side surface portion of the seventh auxiliary element, and the image side surface of the seventh auxiliary element is partially in contact with the object side surface S15 of the eighth lens. The eighth annular element P8 is simultaneously in contact with the image side surface S16 of the eighth lens and the inner wall surface portion of the second lens barrel P02.

[0101] like Fig.10 As shown, in the second state of the optical imaging lens, the sixth auxiliary element is P6b, and the seventh auxiliary element is a combination of P7b and P7c. The abutment mode of each annular element is the same as that in the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0102] like Fig.11As shown, in the third state of the optical imaging lens, the sixth auxiliary element is P6b, and there is no seventh auxiliary element. The image side surface of the seventh annular element P7 partially abuts against the object side surface S15 of the eighth lens. The abutment method of the remaining annular elements is the same as that of the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0103] In summary, the structural parameters of the optical imaging lens of the second embodiment in the first state 2-1, the second state 2-2 and the third state 2-3 are shown in Table 4. (Unit: mm)

[0104] Status / Parameters d2s d3s d4s D4s d5s D5s d6s d6m d7s d7m 2-1 4.2274 4.3304 5.0952 9.1000 7.0564 9.5600 8.7600 10.9612 11.4005 11.4005 2-2 4.2274 4.3304 5.0034 6.4000 6.8512 9.5600 8.7600 10.8960 11.3366 11.3366 2-3 4.2605 4.3642 5.1142 9.2000 7.0047 9.7600 8.7594 11.0320 11.9368 11.9368 Status / Parameters EP23 EP34 EP45 EP56 EP78 L d0bs |SAGH61| |SAGH82| ∑CP 2-1 0.5137 0.5691 0.7890 0.4800 1.1892 9.2700 4.6321 0.7102 1.9219 1.7176 2-2 0.5346 0.5081 0.7915 0.5283 1.1922 9.2900 4.6380 0.7104 1.9519 1.6896 2-3 0.5017 0.5341 0.7751 0.4939 0.9403 9.2700 4.6380 0.7102 1.9219 1.6974

[0105] Table 4

[0106] 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 concave surface, and the image side surface S12 of the sixth lens is a convex 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.

[0107] In Example 2, the effective focal length f of the optical imaging lens is 8.66 mm, the effective focal length f1 of the first lens is 10.43 mm, the effective focal length f2 of the second lens is -47.09 mm, the effective focal length f3 of the third lens is 36.33 mm, the effective focal length f4 of the fourth lens is 192.31 mm, the effective focal length f5 of the fifth lens is -62.14 mm, the effective focal length f6 of the sixth lens is -15.86 mm, the effective focal length f7 of the seventh lens is 7.64 mm, the effective focal length f8 of the eighth lens is -8.09 mm, the combined focal length f12 of the first lens and the second lens is 12.47 mm, the combined focal length f23 of the second lens and the third lens is 177.06 mm, and the effective focal length of the third lens and the fourth lens is 177.06 mm. The combined focal length f34 is 31.05mm, the combined focal length f45 of the fourth lens and the fifth lens is -90.86mm, the combined focal length f56 of the fifth lens and the sixth lens is -12.57mm, the combined focal length f67 of the sixth lens and the seventh lens is 14.46mm, the combined focal length f78 of the seventh lens and the eighth lens is 17.30mm, the combined focal length f345 of the third lens, the fourth lens and the fifth lens is 58.76mm, the combined focal length f678 of the sixth lens, the seventh lens and the eighth lens is -34.52mm, the vertical distance Yc71 from the inflection point on the object side surface of the seventh lens to the optical axis is 2.55mm, and the vertical distance Yc72 from the inflection point on the image side surface of the seventh lens to the optical axis is 3.16mm.

[0108] Table 5 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.

[0109]

[0110] Table 5

[0111] Table 6 shows the polynomial coefficients that can be used for each aspheric mirror surface in the second embodiment, wherein each aspheric surface shape can be defined by the formula (1) given in the first embodiment above.

[0112] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.6291E-02 -2.0027E-02 -6.2657E-03 -1.5138E-03 -2.2209E-04 -2.6526E-06 6.4378E-06 S2 -1.3065E-01 -1.0847E-03 -3.0892E-03 2.5126E-04 4.0446E-05 -5.4112E-05 3.6028E-06 S3 -8.5209E-02 2.5677E-02 1.3614E-03 6.6084E-04 8.0579E-05 -6.3155E-05 -6.7911E-06 S4 -5.0712E-02 1.8501E-02 4.2639E-03 1.2729E-03 2.1052E-04 -4.7544E-05 -4.2008E-05 S5 -3.3312E-02 8.9128E-03 8.5599E-03 1.9332E-03 9.4269E-05 -1.4387E-04 -6.9063E-05 S6 -5.2974E-02 5.5858E-03 5.7146E-03 1.0205E-03 -3.1074E-06 -1.0595E-04 -3.3251E-05 S7 -2.9829E-01 -3.5748E-02 1.5154E-03 3.2628E-04 -6.5787E-04 -4.5336E-04 -2.9142E-04 S8 -4.0997E-01 -4.3191E-02 2.2920E-02 4.3721E-03 3.6205E-03 1.8161E-03 1.5630E-03 S9 -6.0837E-01 -2.4281E-02 1.4562E-02 -8.1301E-03 3.5943E-03 1.1526E-03 2.1163E-03 S10 -6.9372E-01 3.1196E-02 4.4022E-02 -1.3263E-02 3.7372E-03 -3.3157E-03 1.1729E-03 S11 6.4749E-01 -5.2383E-01 1.9177E-01 4.4989E-03 2.0684E-02 -1.8381E-02 2.6480E-03 S12 -7.8961E-01 -2.3974E-02 1.6084E-03 3.8222E-02 -2.2914E-02 -1.6454E-03 9.3220E-03 S13 -7.5618E+00 1.6362E+00 -1.9527E-01 -7.4214E-02 6.8917E-03 3.9563E-02 -2.2977E-02 S14 -5.3143E+00 1.3192E-01 2.1030E-01 -7.8709E-02 7.9344E-03 -2.4973E-02 2.7679E-02 S15 -3.2345E+00 1.4105E+00 -5.4373E-01 2.5635E-01 -1.3785E-01 7.5490E-02 -5.8690E-03 S16 -9.3821E+00 2.3547E+00 -6.0298E-01 2.2500E-01 -1.0379E-01 4.6655E-02 -2.2838E-02 Face number A18 A20 A22 A22 A26 A28 A30 S1 1.0512E-06 1.1041E-05 1.2888E-05 6.5366E-06 4.3116E-08 -1.7227E-06 -1.5643E-07 S2 -8.2211E-06 1.9197E-05 8.7898E-06 4.0340E-06 -5.9073E-06 2.6249E-06 -2.4385E-08 S3 -3.3838E-06 -8.2184E-08 -2.2490E-07 3.4191E-06 9.8214E-07 -9.3920E-07 5.0507E-08 S4 -1.1923E-05 -4.1347E-06 4.9732E-06 2.9908E-06 3.5183E-06 -2.8242E-06 -7.0373E-08 S5 -1.9107E-05 3.2847E-06 7.9219E-06 4.5449E-06 -8.4521E-07 -2.2987E-06 -5.0488E-07 S6 -2.1161E-05 -7.3269E-07 3.5589E-07 4.0206E-06 -7.8530E-08 -2.5294E-07 -2.0501E-06 S7 -1.8988E-04 -1.6412E-04 -1.1279E-04 -6.5400E-05 -3.5696E-05 -1.3619E-05 -4.4685E-06 S8 4.8271E-04 8.2948E-05 -4.7898E-05 -2.6180E-05 -3.6014E-05 -1.4340E-05 -9.7604E-06 S9 2.5822E-04 1.0537E-04 6.6000E-05 8.9456E-05 1.8238E-05 8.5002E-06 4.3554E-06 S10 -5.6112E-04 2.2926E-04 5.3823E-05 6.8475E-05 -1.7976E-05 5.4388E-07 1.4399E-06 S11 -1.6345E-03 1.6203E-03 -4.0085E-04 3.4743E-04 -1.6387E-04 5.8087E-05 -4.5894E-05 S12 -5.5409E-04 5.7903E-05 -4.5198E-04 8.9120E-04 -4.1900E-05 1.7572E-04 -9.5105E-05 S13 -1.6492E-03 3.9397E-03 1.7260E-03 -2.3160E-03 8.6703E-04 9.8782E-05 -6.1431E-05 S14 -2.1401E-03 -4.6467E-03 -3.8260E-03 4.3177E-04 1.2526E-03 2.0836E-04 2.6942E-04 S15 -1.8681E-02 9.0254E-04 8.5468E-03 -5.6944E-03 8.4431E-04 1.6893E-03 -8.0812E-04 S16 1.4101E-02 -1.0990E-02 5.0744E-04 -3.5695E-03 -1.8277E-04 -2.4508E-04 2.8728E-04

[0113] Table 6

[0114] Fig.12 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.13 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.14 The distortion curve of the optical imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Fig.15The 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.

[0115] according to Figures 12 to 15 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0116] Embodiment 3

[0117] like Figures 16 to 22 As shown, the optical imaging lens of embodiment 3 is described. Fig.16 FIG. 1 shows a schematic structural diagram of the optical imaging lens of Embodiment 3 in a first state. Fig.17 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Embodiment 3 in the second state. Fig.18 A schematic structural diagram of the optical imaging lens of Embodiment 3 in a third state is shown.

[0118] like Figures 16 to 18 As shown, the optical imaging lens comprises a lens barrel, a lens group and a plurality of annular elements arranged in the lens barrel, the lens barrel is composed of a first lens barrel P01 and a second lens barrel P02, the second lens barrel P02 is located on the image side of the first lens barrel P01 and the two are glued. A first lens E1 is arranged in the first lens barrel P01, and a second lens E2, a second annular element P2, a third lens E3, a third annular element P3, a fourth lens E4, a fourth annular element P4, a fifth lens E5, a fifth annular element P5, a sixth lens E6, a sixth annular element P6, a sixth auxiliary element, a seventh lens E7, a seventh annular element P7, an eighth lens and an eighth annular element P8 are arranged in the second lens barrel P02 in sequence from the object side to the image side.

[0119] like Fig.16As shown, in the first state, the optical imaging lens, the sixth auxiliary element is P6b, the plurality of annular elements also include the seventh auxiliary element, and the seventh auxiliary element is P7b. The object side surface S1 of the first lens partially abuts with the first lens barrel P01, and the image side surface S2 of the first lens partially abuts with the object side end surface of the second lens barrel P02. The object side surface and the image side surface of the second annular element P2 partially abut 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 the image side surface of the third annular element P3 partially abut 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 the image side surface of the fourth annular element P4 partially abut 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 the image side surface of the fifth annular element P5 partially abut 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 the image side surface of the sixth annular element P6 are respectively in contact with the image side surface S12 of the sixth lens and the object side surface portion of the sixth auxiliary element, and the image side surface of the sixth auxiliary element is partially in contact with the object side surface S13 of the seventh lens. The object side surface and the image side surface of the seventh annular element P7 are respectively in contact with the image side surface S14 of the seventh lens and the object side surface portion of the seventh auxiliary element, and the image side surface of the seventh auxiliary element is partially in contact with the object side surface S15 of the eighth lens. The eighth annular element P8 is simultaneously in contact with the image side surface S16 of the eighth lens and the inner wall surface portion of the second lens barrel P02.

[0120] like Fig.17 As shown, in the second state of the optical imaging lens, the sixth auxiliary element is P6b, and the multiple annular elements further include a fifth auxiliary element, and the fifth auxiliary element is a combination of P5b and P5c. The image side surface of the fifth annular element P5 partially abuts against the object side surface of the fifth auxiliary element, and the image side surface of the fifth auxiliary element partially abuts against the object side surface S11 of the sixth lens. The abutment method of the remaining annular elements is the same as that in the first state, and the relevant description in the first state can be referred to, which will not be repeated here.

[0121] like Fig.18 As shown, in the third state of the optical imaging lens, the sixth auxiliary element is a combination of P6b and P6c, and the plurality of annular elements further include a fifth auxiliary element and a seventh auxiliary element, the fifth auxiliary element is a combination of P5b and P5c, and the seventh auxiliary element is a combination of P7b and P7c. The image side surface of the fifth annular element P5 partially abuts against the object side surface of the fifth auxiliary element, and the image side surface of the fifth auxiliary element partially abuts against the object side surface S11 of the sixth lens. The abutment manner of the remaining annular elements is the same as that of the first state, and reference may be made to the relevant description in the first state, which will not be repeated here.

[0122] In summary, the structural parameters of the optical imaging lens of the third embodiment in the first state 3-1, the second state 3-2 and the third state 3-3 are shown in Table 7. (Unit: mm)

[0123]

[0124]

[0125] Table 7

[0126] In Embodiment 3, 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 convex surface, and the image side surface S8 of the fourth lens is a concave 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 convex 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.

[0127] In Example 3, the effective focal length f of the optical imaging lens is 8.82 mm, the effective focal length f1 of the first lens is 11.13 mm, the effective focal length f2 of the second lens is -44.80 mm, the effective focal length f3 of the third lens is 45.15 mm, the effective focal length f4 of the fourth lens is -32.83 mm, the effective focal length f5 of the fifth lens is 35.04 mm, the effective focal length f6 of the sixth lens is -38.79 mm, the effective focal length f7 of the seventh lens is 9.65 mm, the effective focal length f8 of the eighth lens is -7.68 mm, the combined focal length f12 of the first lens and the second lens is 13.73 mm, the combined focal length f23 of the second lens and the third lens is -1240.18 mm, and the combined focal length f14 of the third lens and the fourth lens is -1240.18 mm. The combined focal length f34 is -140.60mm, the combined focal length f45 of the fourth lens and the fifth lens is -702.60mm, the combined focal length f56 of the fifth lens and the sixth lens is 264.79mm, the combined focal length f67 of the sixth lens and the seventh lens is 12.99mm, the combined focal length f78 of the seventh lens and the eighth lens is 70.13mm, the combined focal length f345 of the third lens, the fourth lens and the fifth lens is 48.97mm, the combined focal length f678 of the sixth lens, the seventh lens and the eighth lens is -45.91mm, the vertical distance Yc71 from the inflection point on the object side surface of the seventh lens to the optical axis is 2.54mm, and the vertical distance Yc72 from the inflection point on the image side surface of the seventh lens to the optical axis is 3.19mm.

[0128] Table 8 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 all millimeters.

[0129]

[0130]

[0131] Table 8

[0132] Table 9 shows the polynomial coefficients that can be used for each aspheric mirror surface in the third embodiment, wherein each aspheric surface shape can be defined by the formula (1) given in the first embodiment above.

[0133] Face number A4 A6 A8 A10 A12 A14 A16 S1 -6.7746E-03 -7.6226E-03 -4.0003E-03 -1.4405E-03 -5.3629E-04 -1.4249E-04 -5.2186E-05 S2 -7.7595E-02 9.6086E-05 -3.5935E-03 -3.6886E-04 -2.6084E-04 6.9091E-05 -1.6261E-05 S3 -7.5157E-02 2.1026E-02 -9.0095E-04 2.4971E-04 -1.9296E-04 1.1007E-04 -2.8432E-05 S4 -6.2187E-02 1.2333E-02 5.5440E-04 2.0431E-04 -3.0816E-04 -2.8778E-05 -6.4221E-05 S5 -7.7819E-02 1.6340E-02 7.0576E-03 1.0927E-03 -2.0379E-04 -5.2098E-05 -3.0368E-05 S6 -3.4850E-02 1.1965E-02 5.1330E-03 1.0270E-03 5.7247E-05 6.0421E-05 3.3629E-05 S7 -3.4182E-01 -1.2175E-02 5.5375E-04 5.7166E-04 -1.0075E-04 6.0828E-05 6.7744E-05 S8 -4.3658E-01 1.4638E-02 1.3039E-02 4.5643E-03 1.7410E-03 2.7222E-04 -1.8287E-04 S9 -2.7128E-01 1.3671E-03 1.0018E-02 4.8340E-03 2.7372E-03 -5.0486E-04 -7.9921E-04 S10 -5.7139E-01 -6.3886E-03 1.7090E-02 9.8208E-03 6.2235E-03 6.9647E-04 -8.2071E-04 S11 -1.0989E+00 -4.7384E-02 7.7099E-02 2.4338E-02 -3.5465E-04 -1.7141E-03 -3.3673E-03 S12 -1.9452E+00 5.0713E-01 -9.8657E-02 4.7218E-03 -1.4627E-02 1.8110E-02 -5.1923E-03 S13 -6.7241E+00 1.3630E+00 -5.6795E-02 -1.2668E-01 2.5244E-02 2.8309E-02 -1.6542E-02 S14 -5.1259E+00 -1.1977E-01 1.0025E-01 -9.6915E-02 6.8381E-02 -4.1924E-02 5.7881E-03 S15 -2.7154E+00 1.2742E+00 -6.1820E-01 2.8111E-01 -1.0650E-01 2.3046E-02 2.1121E-04 S16 -8.3003E+00 2.0219E+00 -5.1924E-01 1.6660E-01 -9.7954E-02 4.9031E-02 -1.5205E-02 Face number A18 A20 A22 A22 A26 A28 A30 S1 -2.6103E-06 -6.3764E-06 7.7011E-06 9.4548E-07 8.4039E-06 1.9573E-06 2.4831E-06 S2 3.0952E-05 1.6892E-05 7.3654E-06 3.2214E-06 -4.0612E-06 0.0000E+00 0.0000E+00 S3 2.4925E-05 1.4592E-05 1.1659E-05 4.6785E-07 -7.2395E-07 0.0000E+00 0.0000E+00 S4 -2.4250E-05 -8.7943E-06 5.4228E-06 4.7803E-06 3.2005E-06 -2.2270E-06 0.0000E+00 S5 -3.3702E-05 -1.6013E-05 -3.1229E-06 4.9917E-06 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.2769E-05 -2.4282E-06 -2.7258E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 1.4416E-05 5.5183E-08 -1.2656E-07 -6.4237E-07 2.1749E-07 0.0000E+00 0.0000E+00 S8 -3.3595E-04 -7.7402E-05 2.1515E-05 2.5143E-05 -2.0100E-06 -8.4859E-07 0.0000E+00 S9 -5.4025E-04 -1.5793E-05 1.0736E-04 4.9473E-05 -3.2733E-06 -8.2470E-06 7.1970E-07 S10 -8.5392E-04 -3.6052E-04 -8.7769E-05 4.7621E-05 3.5444E-05 2.0096E-05 -7.9504E-06 S11 -1.4893E-03 1.3648E-04 3.6006E-04 1.5937E-04 -6.9410E-05 1.1781E-05 -2.8936E-06 S12 -1.8013E-03 7.6994E-04 4.8787E-04 -1.8467E-04 -2.7243E-04 1.5444E-04 -1.5404E-05 S13 -3.6763E-03 5.2749E-03 2.3251E-04 -1.4039E-03 -2.7337E-05 4.6011E-04 -1.3358E-04 S14 -1.1092E-02 1.6230E-03 -9.1304E-04 2.3402E-03 -4.5061E-05 6.5936E-05 -3.0161E-04 S15 -3.5457E-03 -7.0531E-04 2.8421E-03 -8.2534E-04 -3.6199E-04 2.8227E-04 -6.0618E-05 S16 3.2021E-03 -3.9515E-03 2.3089E-03 -3.9266E-04 3.6136E-04 -1.4147E-04 -5.4401E-06

[0134] Table 9

[0135] Fig.19 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. 20 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.21 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. 22 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.

[0136] according to Figures 19 to 22 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0137] In summary, Embodiments 1 to 3 respectively satisfy the relationship shown in Table 10.

[0138]

[0139] Table 10

[0140] It should be noted that, in Table 10, 1-1 represents the optical imaging lens in Example 1 in the first state, 1-2 represents the optical imaging lens in Example 1 in the second state, 1-3 represents the optical imaging lens in Example 1 in the third state, 2-1 represents the optical imaging lens in Example 2 in the first state, 2-2 represents the optical imaging lens in Example 2 in the second state, 2-3 represents the optical imaging lens in Example 2 in the third state, 3-1 represents the optical imaging lens in Example 3 in the first state, 3-2 represents the optical imaging lens in Example 3 in the second state, and 3-3 represents the optical imaging lens in Example 3 in the third state.

[0141] 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.

[0142] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0143] 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.

[0144] 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.

[0145] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An optical imaging lens, characterized in that: It includes a lens barrel, a lens group, and a plurality of annular elements disposed in the lens barrel. The lens group sequentially includes 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. The optical powers of the first lens, the third lens, and the seventh lens are positive, and the optical powers of the second lens, the sixth lens, and the eighth lens are negative. The plurality of annular elements include a second annular element disposed on the image side of the second lens and partially contacting the image side surface of the second lens, a third annular element disposed on the image side of the third lens and partially contacting the image side surface of the third lens, a fourth annular element disposed on the image side of the fourth lens and partially contacting the image side surface of the fourth lens, a fifth annular element disposed on the image side of the fifth lens and partially contacting the image side surface of the fifth lens, a sixth annular element disposed on the image side of the sixth lens and partially contacting the image side surface of the sixth lens, a seventh annular element disposed on the image side of the seventh lens and partially contacting the image side surface of the seventh lens, and an eighth annular element disposed on the image side of the eighth lens and partially contacting the image side surface of the eighth lens. When the distance L on the optical axis from the object-side end face to the image-side end face of the lens barrel, the central thickness CT2 of the second lens on the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 15.0 < L / (CT2 + T12) < 25.0, and the distance L on the optical axis from the object-side end face to the image-side end face of the lens barrel and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.7 < L / T78 < 6.0, the effective focal length f2 of the second lens, the effective focal length f8 of the eighth lens, the inner diameter d2s of the object side surface of the second annular element, and the inner diameter d7s of the object side surface of the seventh annular element satisfy: 1.0 mm < (d7s - d2s) / (f2 / f8) < 2.5 mm.

2. The optical imaging lens according to claim 1, wherein the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 0.5 < N1 / N2 < 1.0; the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: 2.0 < V1 / V2 < 5.0; the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the inner diameter d2s of the object side surface of the second annular element, and the combined focal length f12 of the first lens and the second lens satisfy: 10.0 < (V1 - V2)*d2s / f12 < 25.

0.

3. The optical imaging lens according to claim 1, wherein: the inner diameter d3s of the object side surface of the third annular element, the inner diameter d4s of the object side surface of the fourth annular element, the inner diameter d5s of the object side surface of the fifth annular element, and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0 < (d3s + d4s + d5s) / f345 < 1.

0.

4. The optical imaging lens according to claim 1, wherein: The air interval T56 between the fifth lens and the sixth lens on the optical axis and the interval distance EP56 between the image side surface of the fifth annular element and the object side surface of the sixth annular element along the optical axis satisfy: 0.5 <T56 / EP56<1.5。 5. The optical imaging lens according to claim 1, wherein: The spacing distance EP23 between the image side surface of the second ring element and the object side surface of the third ring element along the optical axis, the spacing distance EP34 between the image side surface of the third ring element and the object side surface of the fourth ring element along the optical axis, the spacing distance EP45 between the image side surface of the fourth ring element and the object side surface of the fifth ring element along the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy the following: 0.4<(EP23+EP34+EP45) / (CT2+CT3+CT4+CT5)<1.

2.

6. The optical imaging lens according to claim 1, wherein: The outer diameter D4s of the object side surface of the fourth annular element, the outer diameter D5s of the object side surface of the fifth annular element, the curvature radius R8 of the image side surface of the fourth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: -1.0<(D4s / D5s) / (R9 / R8)<1.

0.

7. The optical imaging lens according to claim 1, wherein: The spacing distance EP78 between the image side surface of the seventh annular element and the object side surface of the eighth annular element along the optical axis and the air spacing T78 between the seventh lens and the eighth lens on the optical axis satisfy: 0.2 <EP78 / T78<0.9。 8. The optical imaging lens according to claim 1, wherein: The inner diameter d7s of the object side surface of the seventh annular element and the combined focal length f78 of the seventh lens and the eighth lens satisfy the following relationship: 0.1 <d7s / f78<0.9。 9. The optical imaging lens according to claim 1, wherein: The dispersion coefficient V7 of the seventh lens, the dispersion coefficient V8 of the eighth lens, the spacing distance EP78 between the image side surface of the seventh ring element and the object side surface of the eighth ring element along the optical axis, and the effective focal length f7 of the seventh lens satisfy: 8.0<(V7+V8)*EP78 / f7<18.

0.

10. The optical imaging lens according to claim 1, wherein: The inner diameter d6s of the object side surface of the sixth annular element, the inner diameter d6m of the image side surface of the sixth annular element and the effective focal length f6 of the sixth lens satisfy: -1.5<(d6s+d6m) / f6<-0.

2.

11. The optical imaging lens according to claim 1, wherein: The sum ∑CP of the maximum thicknesses of the second annular element to the eighth annular element along the optical axis and the axial distance TD from the object side surface of the first lens to the image side surface of the eighth lens satisfy the following: 0.01<∑CP / TD<0.

5.

12. The optical imaging lens according to claim 1, wherein: The plurality of annular elements further include a sixth auxiliary element partially abutting against the sixth annular element, and an outer diameter D6bs of the object side surface of the sixth auxiliary element, an inner diameter d6bs of the object side surface of the sixth auxiliary element, and a curvature radius R12 of the image side surface of the sixth lens satisfy: -0.5<(D6bs-d6bs) / R12<0.

5.

13. The optical imaging lens according to claim 1, wherein: A vertical distance Yc71 from the inflection point on the object side surface of the seventh lens to the optical axis, a vertical distance Yc72 from the inflection point on the image side surface of the seventh lens to the optical axis, an inner diameter d6s of the object side surface of the sixth annular element and an inner diameter d7m of the image side surface of the seventh annular element satisfy the following: 1.2<(Yc72 / Yc71) / (d6s / d7m)<2.

0.

14. The optical imaging lens according to claim 1, wherein: The lens barrel comprises a first lens barrel and a second lens barrel, the first lens barrel is glued to the second lens barrel, the first lens is arranged in the first lens barrel, the second lens to the eighth lens are arranged in the second lens barrel, and the minimum inner diameter d0bs of the second lens barrel, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -25.0 <d0bs / (f1 / f2)<-10.0。 15. The optical imaging lens according to claim 1, wherein: The combined focal length f678 of the sixth lens, the seventh lens and the eighth lens, the on-axis distance SAGH61 between the intersection of the object side surface of the sixth lens and the optical axis to the object side vertex of the maximum outer diameter of the fifth lens, and the on-axis distance SAGH82 between the intersection of the image side surface of the eighth lens and the optical axis to the image side vertex of the maximum outer diameter of the eighth lens satisfy: -25.0 <f678 / (|SAGH61|+|SAGH82|)<-5.0。

Images