Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing element group, and the lens group and the spacing element group are arranged in the lens barrel. The six lenses are sequentially a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from the object side to the image side along the optical axis of the optical imaging lens; the following conditions are satisfied: 1.00 lt; cT5 / EP45 / N5lt; 1.75, 1.75; f4 / (EP34 + CP4) is greater than or equal to-2.05 and less than or equal to-1.35; and (D5m-d4s) / CP5 is more than or equal to 3.59 and less than or equal to 5.60. According to the invention, the problem that the size of the lens is increased due to the fact that a six-piece optical imaging lens in the prior art meets the performance requirement, and thus discretization is caused is solved.

Description

Technical Field

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

[0002] With the development of optical imaging technology, optical imaging lenses of different specifications are widely used in security, automobiles, wearable devices, drones and other fields. Especially in the field of smart home, which is developing rapidly, optical imaging lenses are more commonly used in common home appliances, especially infrared confocal optical imaging lenses. This requires that the optical imaging lens can receive information well in daytime or nighttime. The six-piece optical imaging lens is selected by major manufacturers as the infrared confocal optical imaging lens due to its advantages of stable imaging and small number of lenses.

[0003] At present, in order to meet performance requirements and design requirements, existing six-element optical imaging lenses usually constrain the size of the tail structure to meet the needs of information reception stability. However, in this case, it is often easy to lead to an increase in lens size, which causes a series of problems. For example, a larger lens size is prone to cause discrete problems, which in turn affects the final imaging quality.

[0004] That is to say, the six-element optical imaging lens in the prior art has the problem of increasing the lens size in order to meet the performance requirements, thus causing the discrete problem. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the six-lens optical imaging lens in the prior art has an increase in lens size in order to meet performance requirements, thereby causing discreteness.

[0006] To achieve the above object, according to one aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power; the spacer element group includes a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens, a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; wherein, the center thickness CT5 of the fifth lens, the spacing distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis direction of the optical imaging lens, and the refractive index N5 of the fifth lens satisfy: 1.00 < CT5 / EP45 / N5 < 1.75; the effective focal length f4 of the fourth lens, the spacing distance EP34 from the third spacer element to the fourth spacer element along the optical axis direction, and the maximum axial thickness CP4 of the fourth spacer element satisfy: -2.05 ≤ f4 / (EP34 + CP4) ≤ -1.35; the outer diameter D5m of the image side surface of the fifth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, and the maximum axial thickness CP5 of the fifth spacer element satisfy: 3.59 ≤ (D5m - d4s) / CP5 ≤ 5.60.

[0007] According to another aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power; the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface is convex; the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave; the spacer element group includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. Wherein, the maximum axial height L of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: 2.60 < L / (f×TAN(Semi-FOV)) < 2.75; the interval distance EP01 from the object side end surface of the lens barrel to the first spacer element along the optical axis direction, the maximum axial thickness CP1 of the first spacer element, and the interval distance EP12 from the first spacer element to the second spacer element along the optical axis direction satisfy: 0.46 ≤ EP01 / (CP1 + EP12) ≤ 0.76.

[0008] According to another aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power; the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface is convex; the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave; the spacer element group includes a fifth spacer element disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens. Wherein, the maximum axial height L of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: 2.60 < L / (f×TAN(Semi-FOV)) < 2.75; the effective focal length f5 of the fifth lens, the central thickness CT5 of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 4.35mm < d5s / (f5 / CT5) < 5.05mm.

[0009] Furthermore, the effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, and the spacing distance EP34 from the third spacing element to the fourth spacing element along the optical axis satisfy: -1.35 mm -1 <f4 / R8 / EP34<-0.80mm -1 .

[0010] Furthermore, the effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens, and the spacing distance EP45 from the fourth spacing element to the fifth spacing element along the optical axis satisfy: 1.25 mm <f5 / (CT5 / EP45)<2.22mm。

[0011] Furthermore, the maximum axial height L of the lens barrel and half of the maximum field of view Semi-FOV of the optical imaging lens meet the following conditions: 9.40 mm <L / TAN(Semi-FOV)<10.45mm。

[0012] Further, the inner diameter d0m of the image side end surface of the lens barrel and the inner diameter d0s of the object side end surface of the lens barrel satisfy the following relationship: 1.42≤d0m / d0s≤1.56.

[0013] Furthermore, an effective focal length f5 of the fifth lens, a refractive index N5 of the fifth lens, and an inner diameter d5s of the object-side surface of the fifth spacer element satisfy: 0.33≤f5 / N5 / d5s≤0.41.

[0014] Further, an outer diameter D4m of the image side surface of the fourth spacer element, an inner diameter d4s of the object side surface of the fourth spacer element, an outer diameter D5m of the image side surface of the fifth spacer element and an inner diameter d5s of the object side surface of the fifth spacer element satisfy: 1.30<(D4m-d4s) / (D5m-d5s)<1.80.

[0015] Furthermore, the object side surface of the third lens is convex, and the image side surface is convex; the inner diameter d3m of the image side surface of the third spacing element, the outer diameter D4s of the object side surface of the fourth spacing element and the inner diameter d3s of the object side surface of the third spacing element satisfy: 0.65 <d3m / (D4s-d3s)<0.85。

[0016] Furthermore, the spacer element group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. The spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction, the spacing distance EP45 between the fourth spacer element and the fifth spacer element in the optical axis direction, and the maximum axial height L of the lens barrel satisfy: 0.24 ≤ (EP12 + EP45) / L ≤ 0.32; the maximum axial thickness CP2 of the second spacer element, the maximum axial thickness CP5 of the fifth spacer element, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.95 < (CP2 + CP5) / (T23 + T56) < 2.40.

[0017] Furthermore, the spacer element group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. The spacing distance EP01 between the object side end face of the lens barrel and the first spacer element in the optical axis direction, the maximum axial thickness CP1 of the first spacer element, and the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction satisfy: 0.46 ≤ EP01 / (CP1 + EP12) ≤ 0.76.

[0018] Furthermore, the spacing distance EP34 between the third spacer element and the fourth spacer element in the optical axis direction, the maximum axial thickness CP4 of the fourth spacer element, and the distance SG42 between the intersection point of the image side surface of the fourth lens on the optical axis and the object side surface of the fourth spacer element in the optical axis direction satisfy: 2.40 < (EP34 + CP4) / SG42 < 5.85.

[0019] Furthermore, the image side surface of the fourth lens is a concave surface; the distance SG42 between the intersection point of the image side surface of the fourth lens on the optical axis and the object side surface of the fourth spacer element in the optical axis direction and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.15 < SG42 / R8 < 0.35.

[0020] Furthermore, the spacer element group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. The center thickness CT2 of the second lens and the center thickness CT1 of the first lens satisfy: 5.10 < CT2 / CT1 < 7.40; the spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction and the spacing distance EP01 between the object side end face of the lens barrel and the first spacer element in the optical axis direction satisfy: 1.10 < EP12 / EP01 < 1.70.

[0021] Furthermore, the object side of the first lens is convex and the image side is concave; the image side of the second lens is convex; the object side of the fifth lens is convex and the image side is convex; the object side of the sixth lens is convex and the image side is concave.

[0022] Applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel and six lenses and a plurality of spacer elements arranged in the lens barrel, and has the technical feature of wide angle. By reasonably arranging the optical powers of the six lenses, the positions of the third spacer element, the fourth spacer element, and the fifth spacer element, and setting that the optical imaging lens satisfies 1.00 < CT5 / EP45 / N5 < 1.75, the central thickness of the fifth lens is relatively large and the refractive index is relatively high. Due to the relatively thick central thickness of the fifth lens, it is easy to cause problems such as the dispersion and low peak value of the MTF defocus curve. Therefore, the present application constrains -2.05 ≤ f4 / (EP34 + CP4) ≤ -1.35 and 3.59 ≤ (D5m - d4s) / CP5 ≤ 5.60. By controlling the ratio of f4 to the sum of EP34 and CP4 within a certain range, combined with controlling the ratio range of the difference between D5m and d4s to CP5, the thicknesses of the fourth spacer element and the fifth spacer element located before and after the fifth lens are controlled, thereby constraining the edge thickness of the fifth lens; it is also beneficial to control the overall shape of the fifth lens, reduce the influence of the fifth lens on the MTF peak value and dispersion after assembly, is beneficial to improving the dispersion problem of the MTF defocus curve, makes the performance of the optical imaging lens more stable, and ensures the imaging quality. Description of the Drawings

[0023] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 Shows the dimension marking diagram of the optical imaging lens of an optional embodiment of the present invention;

[0025] Figure 2 Shows the partial dimension marking diagram of the optical imaging lens of an optional embodiment of the present invention;

[0026] Figure 3 Shows the structural schematic diagram of the optical imaging lens of Embodiment 1-1 of the present invention;

[0027] Figure 4 Shows the structural schematic diagram of the optical imaging lens of Embodiment 1-2 of the present invention;

[0028] Figure 5 Shows the structural schematic diagram of the optical imaging lens of Embodiment 1-3 of the present invention;

[0029] Figures 6 to 8 respectively show the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens according to the first embodiment of the present invention;

[0030] Fig. 9 show a schematic structural diagram of the optical imaging lens according to the embodiment 2-1 of the present invention;

[0031] Fig.10 show a schematic structural diagram of the optical imaging lens according to the embodiment 2-2 of the present invention;

[0032] Fig.11 show a schematic structural diagram of the optical imaging lens according to the embodiment 2-3 of the present invention;

[0033] Figure 12 to Figure 14 respectively show the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens according to the second embodiment of the present invention;

[0034] Fig.15 show a schematic structural diagram of the optical imaging lens according to the embodiment 3-1 of the present invention;

[0035] Fig.16 show a schematic structural diagram of the optical imaging lens according to the embodiment 3-2 of the present invention;

[0036] Fig.17 show a schematic structural diagram of the optical imaging lens according to the embodiment 3-3 of the present invention;

[0037] Figures 18 to 20 respectively show the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens according to the third embodiment of the present invention;

[0038] Fig.21 show the MTF defocus curve diagram when the optical imaging lens according to an optional embodiment of the present invention satisfies 1.00 < CT5 / EP45 / N5 < 1.75, -2.05 ≤ f4 / (EP34 + CP4) ≤ -1.35, 3.59 ≤ (D5m - d4s) / CP5 ≤ 5.60;

[0039] Fig. 22 show the MTF defocus curve diagram when the optical imaging lens of Example 1 satisfies CT5 / EP45 / N5 = 1.27, f4 / (EP34 + CP4) = -3.0 and (D5m - d4s) / CP5 = 3.0;

[0040] Fig.23 show the MTF defocus curve diagram when the optical imaging lens of Example 2 satisfies CT5 / EP45 / N5 = 1.27, f4 / (EP34 + CP4) = -1.0 and (D5m - d4s) / CP5 = 6.5.

[0041] The above drawings include the following reference numerals:

[0042] P0, lens barrel; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; P1, first spacing element; P2, second spacing element; P3, third spacing element; P4, fourth spacing element; P5, fifth spacing element. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0045] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0046] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0048] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in this field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side as an example, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; taking the image side as an example, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In this application, the left side is the object side and the right side is the image side.

[0049] To solve the problem in the prior art that the six-piece optical imaging lens has an increased lens size to meet the performance requirements, resulting in dispersion, the present invention provides an optical imaging lens.

[0050] As Figures 1 to 21 shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power; the spacer element group includes a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens, a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed on the image side of the fifth lens and in contact with the image side surface of the fifth lens; wherein, the center thickness CT5 of the fifth lens, the interval distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis direction of the optical imaging lens, and the refractive index N5 of the fifth lens satisfy: 1.00 < CT5 / EP45 / N5 < 1.75; the effective focal length f4 of the fourth lens, the interval distance EP34 from the third spacer element to the fourth spacer element along the optical axis direction, and the maximum axial thickness CP4 of the fourth spacer element satisfy: -2.05 ≤ f4 / (EP34 + CP4) ≤ -1.35; the outer diameter D5m of the image side surface of the fifth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, and the maximum axial thickness CP5 of the fifth spacer element satisfy: 3.59 ≤ (D5m - d4s) / CP5 ≤ 5.60.

[0051] The optical imaging lens of the present application is composed of a lens barrel and six lenses and multiple spacer elements arranged in the lens barrel, and has the technical feature of wide angle. By reasonably arranging the optical powers of the six lenses, the positions of the third spacer element, the fourth spacer element, and the fifth spacer element, and setting the optical imaging lens to satisfy 1.00 < CT5 / EP45 / N5 < 1.75, the central thickness of the fifth lens is relatively large and the refractive index is relatively high. Due to the relatively thick central thickness of the fifth lens, it is easy to cause problems such as the dispersion and low peak value of the MTF defocus curve. Therefore, in the present application, by constraining -2.05 ≤ f4 / (EP34 + CP4) ≤ -1.35 and 3.59 ≤ (D5m - d4s) / CP5 ≤ 5.60, by controlling the ratio of f4 to the sum of EP34 and CP4 within a certain range, combined with controlling the ratio range of the difference between D5m and d4s to CP5, the thicknesses of the fourth spacer element and the fifth spacer element located before and after the fifth lens are controlled, thereby constraining the edge thickness of the fifth lens; it is also beneficial to control the overall shape of the fifth lens, reduce the influence of the fifth lens on the MTF peak value and dispersion after assembly, and is beneficial to improving the dispersion problem of the MTF defocus curve, making the performance of the optical imaging lens more stable and ensuring the imaging quality.

[0052] It should be noted that the maximum axial thickness CP4 of the above-mentioned fourth spacer element specifically refers to the distance along the optical axis from the surface of the fourth spacer element closest to the object side to the surface of the fourth spacer element closest to the image side. Similarly, hereinafter, the maximum axial thickness of the spacer element refers to the distance along the optical axis from the surface of the spacer element closest to the object side to the surface closest to the image side.

[0053] It should also be noted that the above-mentioned spacer element group further includes a first spacer element placed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element placed on the image side of the second lens and in contact with the image side surface of the second lens.

[0054] In addition, referring to Table 1 below and Fig.21 、 Fig. 22 、 Fig.23 as shown, Fig.21 shows the MTF defocus curve graph of the optical imaging lens of an optional embodiment of the present application when 1.00 < CT5 / EP45 / N5 < 1.75, -2.05 ≤ f4 / (EP34 + CP4) ≤ -1.35, and 3.59 ≤ (D5m - d4s) / CP5 ≤ 5.60. For example, CT5 / EP45 / N5 = 1.27, f4 / (EP34 + CP4) = -1.66, and (D5m - d4s) / CP5 = 4.95, but not limited thereto. Fig. 22The MTF defocus curve diagram is shown when the optical imaging lens of Example 1 satisfies CT5 / EP45 / N5=1.27, f4 / (EP34+CP4)=-3.0 and (D5m-d4s) / CP5=3.0. Fig.23 The MTF through focus curve diagram of the optical imaging lens of Example 2 is shown when CT5 / EP45 / N5=1.27, f4 / (EP34+CP4)=-1.0 and (D5m-d4s) / CP5=6.5. The field of view in the MTF through focus curve diagram includes 0F, 0.5F, 0.8F, and 1.0F.

[0055] Depend on Figure 21 to Figure 23 It can be seen that when f4 / (EP34+CP4)=-1.66 and (D5m-d4s) / CP5=4.95 are met, the MTF defocus curve is more concentrated, most of the field of view peaks are higher and more concentrated, the optical sensitivity is low, and the performance is better. When f4 / (EP34+CP4)=-3.0 and (D5m-d4s) / CP5=3.0 are met, the overall field curvature is large, the overall field of view peak is low, eccentricity and tilt are more sensitive, and the performance is poor. When f4 / (EP34+CP4)=-1.0 and (D5m-d4s) / CP5=6.5 are met, the field curvature is positive, the MTF peak of most of the field of view is low, and the performance is poor. It can be seen that when f4 / (EP34+CP4) is in the range of -2.05 to -1.35 and (D5m-d4s) / CP5 is in the range of 3.59 to 5.59, most of the field peaks of the MTF defocus curve of the optical imaging lens are high and concentrated, and the performance is the best. Therefore, the present application improves the discrete problem of the MTF defocus curve by constraining -2.05≤f4 / (EP34+CP4)≤-1.35 and 3.59≤(D5m-d4s) / CP5≤5.60, by controlling the ratio of f4 to the sum of EP34 and CP4 within a certain range, and combining the control of the ratio range of the difference between D5m and d4s and CP5, so that the MTF value meets the design requirements, the field curvature reaches the best state, the performance of the optical imaging lens is more stable, and the imaging quality is guaranteed.

[0056] Table 1

[0057]

[0058] In this embodiment, the effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, and the spacing distance EP34 from the third spacing element to the fourth spacing element along the optical axis satisfy: -1.35 mm -1 <f4 / R8 / EP34<-0.80mm -1By controlling the effective focal length of the fourth lens, the radius of curvature of the image side surface, and the distance from the third spacer element to the fourth spacer element within a certain range, it is possible to reduce distortion by controlling the shape of the fourth lens, reasonably control the total deflection angle of the marginal field of view on the two surfaces of the fourth lens within a reasonable range, and at the same time effectively reduce the sensitivity of the entire system.

[0059] In this embodiment, the effective focal length f5 of the fifth lens, the central thickness CT5 of the fifth lens, and the interval distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis direction satisfy: 1.25 mm < f5 / (CT5 / EP45) < 2.22 mm. By controlling the effective focal length of the fifth lens, the light path within the fifth lens can be better controlled. By controlling the central thickness of the fifth lens and the distance from the fourth spacer element to the fifth spacer element, the overall thickness of the fifth lens can be made more uniform and reasonable. While ensuring better shaping, it can prevent ineffective light paths outside the aspherical edge from entering the subsequent system, which is beneficial to reducing the generation and intensity of stray light.

[0060] In this embodiment, the maximum axial height L of the lens barrel and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: 9.40 mm < L / TAN(Semi-FOV) < 10.45 mm. By controlling this conditional expression, while ensuring that the optical imaging lens has the characteristic of a large field of view angle, the overall length of the optical imaging lens is restricted, ensuring that the overall size will not be too large, which is beneficial to realizing miniaturization. It should be noted that the above maximum axial height L of the lens barrel is specifically the interval distance on the optical axis from the object-side end face of the lens barrel to the image-side end face of the lens barrel.

[0061] In this embodiment, the inner diameter d0m of the image-side end face of the lens barrel and the inner diameter d0s of the object-side end face of the lens barrel satisfy: 1.42 ≤ d0m / d0s ≤ 1.56. By controlling this condition and combining the sizes of the object-side end face and the image-side end face of the lens barrel, on the one hand, the size of the object-side end face of the lens barrel is ensured to guarantee the assembly stability; on the other hand, the uniformity of the overall wall thickness of the lens barrel is ensured. On the premise of ensuring sufficient dispensing space, the overall structure of the optical imaging lens is made more stable.

[0062] In this embodiment, the effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d5s of the object-side surface of the fifth spacer element satisfy: 0.33 ≤ f5 / N5 / d5s ≤ 0.41. By controlling this condition, the ghost images generated by the fifth lens can be effectively improved. At the same time, by controlling the inner diameter of the object-side surface of the fifth spacer element within a certain range, it can be ensured that the fifth spacer element can block the excess light generated by the effective diameter edge of the fifth lens, reducing the possibility of stray light generation.

[0063] In this embodiment, the following conditions are satisfied among the outer diameter D4m of the image side surface of the fourth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, the outer diameter D5m of the image side surface of the fifth spacer element, and the inner diameter d5s of the object side surface of the fifth spacer element: 1.30 < (D4m - d4s) / (D5m - d5s) < 1.80. By controlling this condition, the risk of eccentricity of the fourth spacer element and the fifth spacer element inside the optical imaging lens can be reduced by restricting the effective radial heights of the fourth spacer element and the fifth spacer element, better controlling the light path inside the optical imaging lens, reducing the optical sensitivity, and improving the imaging quality.

[0064] In this embodiment, the object side surface of the third lens is convex, and the image side surface is convex; the following condition is satisfied among the inner diameter d3m of the image side surface of the third spacer element, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d3s of the object side surface of the third spacer element: 0.65 < d3m / (D4s - d3s) < 0.85. By controlling this condition within a certain range and controlling the surface shape of the third lens, the stray light problem caused by excessive surface curvature of the lens between the third spacer element and the fourth spacer element can be improved, which is beneficial to improving the imaging quality of the on-axis field of view.

[0065] In this embodiment, the following conditions are satisfied among the spacing distance EP12 between the first spacer element and the second spacer element along the optical axis direction, the spacing distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis direction, and the maximum axial height L of the lens barrel: 0.24 ≤ (EP12 + EP45) / L ≤ 0.32; the following condition is satisfied among the maximum axial thickness CP2 of the second spacer element, the maximum axial thickness CP5 of the fifth spacer element, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis: 0.95 < (CP2 + CP5) / (T23 + T56) < 2.40. By controlling the ratio of the sum of EP12 and EP45 to the maximum axial height L of the lens barrel within a certain range, the edge thicknesses of the second lens and the fifth lens between them can be ensured to be within a reasonable range, making the overall thickness of the second lens more uniform and more conducive to processing and forming; by controlling the ratio of the sum of CP2 and CP5 to the sum of T23 and T56 within a certain range, the lens wall thickness inside the optical imaging lens can be controlled within a reasonable range, while ensuring the thickness uniformity of the second spacer element and the fifth spacer element, and improving the structural stability of the optical imaging lens.

[0066] In this embodiment, the distance EP01 from the object-side end face of the lens barrel to the first spacer element in the optical axis direction, the maximum axial thickness CP1 of the first spacer element, and the distance EP12 from the first spacer element to the second spacer element in the optical axis direction satisfy: 0.46 ≤ EP01 / (CP1 + EP12) ≤ 0.76. By controlling this condition, the wall thickness strength of the object-side end of the lens barrel on which the first lens abuts can be ensured. At the same time, by reasonably balancing the thickness of the first spacer element and the distance from the first spacer element to the second spacer element in the optical axis direction, the overall thickness uniformity of the first lens is ensured, and the phenomenon of unstable reliability of the optical imaging lens is avoided.

[0067] In this embodiment, the distance EP34 from the third spacer element to the fourth spacer element in the optical axis direction, the maximum axial thickness CP4 of the fourth spacer element, and the distance SG42 from the intersection point of the image side of the fourth lens on the optical axis to the object side of the fourth spacer element in the optical axis direction satisfy: 2.40 < (EP34 + CP4) / SG42 < 5.85. By restricting the maximum axial thickness of the fourth spacer element and the edge thickness of the fourth lens, the thickness rationality of the fourth lens and the fourth spacer element is ensured. SG42 can restrict the bending degree of the image side of the fourth lens, thereby improving the surface uniformity and overall structural strength of the fourth lens.

[0068] In this embodiment, the image side of the fourth lens is a concave surface; the distance SG42 from the intersection point of the image side of the fourth lens on the optical axis to the object side of the fourth spacer element in the optical axis direction and the radius of curvature R8 of the image side of the fourth lens satisfy: 0.15 < SG42 / R8 < 0.35. By controlling this condition within a reasonable range and restricting the image side of the fourth lens to be a concave surface, it can be ensured that the divergent light rays after passing through the fourth lens, under the correction of the radius of curvature of the object side of the fourth lens, can ensure that the incident light rays show a certain converging trend when passing through the fourth lens, so as to better make all the effective light rays be received by the chip and ensure the imaging quality.

[0069] In this embodiment, the center thickness CT2 of the second lens and the center thickness CT1 of the first lens satisfy: 5.10 < CT2 / CT1 < 7.40; the distance EP12 from the first spacer element to the second spacer element in the optical axis direction and the distance EP01 from the object-side end face of the lens barrel to the first spacer element in the optical axis direction satisfy: 1.10 < EP12 / EP01 < 1.70. By controlling the center thicknesses of the first lens and the second lens within a certain range, the path trend of the light rays after passing through the first lens can be restricted, the sensitivity of the system can be reduced, and the ghost images generated by the edge of the first lens can be improved; by controlling EP12 and EP01, the thickness and quantity of the spacer elements can be reasonably restricted to reduce the generation of stray light.

[0070] In this embodiment, the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the second lens is convex; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave. By reasonably controlling the surface types of each lens, the light passing through the intermediate lens from the first lens to the last lens can be more reasonably controlled, which is beneficial to avoiding ghost images. At the same time, the structure of the entire optical imaging lens is made more reasonable, improving the stability of the optical imaging lens.

[0071] As Figures 1 to 21 shown, in another alternative embodiment of the present application, an optical imaging lens is further provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power; the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface is convex; the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave; the spacer element group includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. Among them, the maximum axial height L of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: 2.60 < L / (f×TAN(Semi-FOV)) < 2.75; the interval distance EP01 from the object side end surface of the lens barrel to the first spacer element along the optical axis direction, the maximum axial thickness CP1 of the first spacer element, and the interval distance EP12 from the first spacer element to the second spacer element along the optical axis direction satisfy: 0.46 ≤ EP01 / (CP1 + EP12) ≤ 0.76.

[0072] The optical imaging lens of the present application is composed of a lens barrel and six lenses and a plurality of spacer elements arranged in the lens barrel. By arranging the six lenses with a negative-positive-negative-positive-negative focal power distribution and surface shape control, the positions of the first spacer element and the second spacer element, and setting the optical imaging lens to satisfy 2.60 < L / (f×TAN(Semi-FOV)) < 2.75 and 0.46 ≤ EP01 / (CP1+EP12) ≤ 0.76, it can be ensured that the total length of the optical imaging lens, the effective focal length, and the field of view angle meet this limitation, and at the same time meet the wide-angle requirement. It can ensure the wall thickness strength of the object-side end of the lens barrel supported by the first lens. At the same time, by reasonably balancing the thickness of the first spacer element and the distance between the first spacer element and the second spacer element along the optical axis direction, the uniformity of the overall thickness of the first lens is ensured, and the phenomenon of unstable reliability of the optical imaging lens is avoided.

[0073] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0074] As Figures 1 to 21 shown, in another alternative embodiment of the present application, an optical imaging lens is further provided, including a lens barrel and a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of six lenses. The six lenses are sequentially arranged from the object side to the image side along the optical axis of the optical imaging lens as a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, and a sixth lens with negative focal power; the object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the second lens is convex; the object side surface of the third lens is convex, and the image side surface is convex; the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave; the spacer element group is a fifth spacer element placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens. Among them, the maximum axial height L of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view angle Semi-FOV of the optical imaging lens satisfy: 2.60 < L / (f×TAN(Semi-FOV)) < 2.75; the effective focal length f5 of the fifth lens, the central thickness CT5 of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 4.35mm < d5s / (f5 / CT5) < 5.05mm.

[0075] The optical imaging lens of the present application is composed of a lens barrel, six lenses and a plurality of spacer elements arranged in the lens barrel. By arranging the six lenses with a negative-positive-negative-positive-negative focal power distribution and surface shape control, and the position of the fifth spacer element, and setting the optical imaging lens to satisfy 2.60 < L / (f×TAN(Semi-FOV)) < 2.75 and 4.35mm < d5s / (f5 / CT5) < 5.05mm, it can ensure that the total axial length of the optical imaging lens, the effective focal length and the field of view angle meet this limitation, and at the same time meet the wide-angle requirement, ensure the shape uniformity of the fifth lens, and further ensure the stable cooperation between the fifth spacer element and the fifth lens, ensure the assembly stability, and avoid the unstable phenomenon of the reliability of the optical imaging lens.

[0076] 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.

[0077] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0078] Optionally, the optical imaging lens in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. During the simulation using the above software and / or tools, the surface shape of each lens can be appropriately adjusted according to the surface shape自带 by the software and / or tool used.

[0079] The optical imaging lens in the present application can use multiple lenses, such as the six lenses described above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristic of an aspherical lens is 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.

[0080] 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 six lenses are described as an example in the embodiment, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0081] Figure 1 A schematic diagram of the dimension marking of an optical imaging lens of the present application is shown. Figure 2 A schematic diagram of the dimension marking of another optical imaging lens of the present application is shown. Figure 1Parameters such as d0s, d4s, d3s, d3m, d5s, D4m, D5m, D4s, d0m, EP01, EP12, EP34, L, EP45, CP1, CP2, CP4 and CP5 are indicated in the figure. Figure 2 SG42 is mainly indicated in the figure to clearly and intuitively understand the meaning of this parameter. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0082] 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. It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3, in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3, and in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3. The parameters such as the radius of curvature, center thickness, and spacing distance between lenses and high-order coefficients of the optical imaging lens in the three examples of the same embodiment are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element to the fifth spacing element are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0083] It should be noted that any one of the following examples 1 to 3 is applicable to all implementation methods of the present application.

[0084] Embodiment 1

[0085] like Figures 3 to 8 As shown, the optical imaging lens of the first embodiment is described. Figure 3 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 4 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-2 is shown, Figure 5 The schematic diagram of the structure of the optical imaging lens of Embodiment 1-3 is shown.

[0086] like Figures 3 to 5 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, and a sixth lens E6, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0.

[0087] like Figure 3, which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the object side surface and image side surface of the first spacer element P1 are in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and image side surface of the second spacer element P2 are in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element P3 are in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and image side surface of the fourth spacer element P4 are in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and image side surface of the fifth spacer element P5 are in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively.

[0088] like Figure 4 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-2. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0089] like Figure 5 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-3. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0090] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 2 (unit: mm).

[0091] Table 2

[0092] Parameters\Example 1-1 1-2 1-3 d3s 3.668 3.657 3.763 d3m 3.668 3.657 3.763 d4s 4.780 4.769 4.504 D4s 8.700 8.500 8.800 D4m 8.700 8.500 8.800 d5s 5.724 5.916 5.517 D5m 8.708 8.396 8.723 d0s 7.280 7.280 7.280 d0m 10.989 10.666 10.342 EP01 1.759 1.852 1.659 CP1 0.027 0.027 0.027 EP12 2.519 2.426 2.619 CP2 0.022 0.022 0.022 EP34 1.893 1.809 1.998 CP4 0.030 0.030 0.022 EP45 1.726 1.725 1.774 CP5 0.969 1.011 0.921 L 13.892 13.892 13.892 SG42 0.763 0.763 0.771

[0093] 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 concave surface, and the image side surface S4 of the second lens is a convex 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 convex 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.

[0094] In Embodiment 1, half of the maximum field of view (Semi-FOV) of the optical imaging lens is 53.10°, the effective focal length f of the optical imaging lens is 3.922 mm, the effective focal length f1 of the first lens is -6.703 mm, the effective focal length f2 of the second lens is 18.134 mm, the effective focal length f3 of the third lens is 3.483 mm, the effective focal length f4 of the fourth lens is -3.774 mm, the effective focal length f5 of the fifth lens is 3.802 mm, and the effective focal length f6 of the sixth lens is -5.589 mm.

[0095] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0096] Table 3

[0097]

[0098] In the first embodiment, the object side surface and the image side surface of the first lens E1 to the sixth lens E6 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:

[0099]

[0100] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the direction of the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 3; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface S1-S12 in Example 1.

[0101] Table 4

[0102] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.41E-02 582E-03 -141E-03 -6.48E-05 2.36E-04 -1.11E-04 2.91E-05 S2 -1.65E-02 5.86E-03 -3.21E-04 -9.37E-04 5.26E-04 -1.20E-04 1.07E-05 S3 -3.81E-03 4.80E-05 1.46E-03 -2.27E-03 2.07E-03 -1.12E-03 3.60E-04 S4 5.96E-03 -2.50E-02 7.61E-02 -1.41E-01 1.69E-01 -1.35E-01 7.22E-02 S5 1.02E-02 -4.70E-03 7.16E-03 -8.53E-03 7.35E-03 -4.56E-03 2.04E-03 S6 3.45E-02 -2.69E-02 4.03E-02 -6.06E-02 6.28E-02 -4.31E-02 1.96E-02 S7 -3.78E-02 7.40E-03 1.13E-02 -3.28E-02 4.02E-02 -2.95E-02 1.39E-02 S8 -7.89E-02 3.64E-02 -2.23E-02 1.09E-02 -3.91E-03 9.94E-04 -1.95E-04 S9 7.32E-03 -8.64E-04 -8.75E-04 1.35E-03 -1.08E-03 5.44E-04 -1.80E-04 S10 -2.12E-04 -1.88E-03 -4.03E-04 1.18E-03 -7.64E-04 2.80E-04 -6.52E-05 S11 -4.47E-03 5.01E-03 -1.52E-02 1.76E-02 -1.24E-02 596E-03 -2.04E-03 S12 -3.39E-02 3.36E-03 1.39E-03 -1.80E-03 1.17E-03 -5.25E-04 1.70E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -4.78E-06 4.86E-07 -2.80E-08 6.99E-10 0.00E+00 0.00E+00 0.00E+00 S2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 -6.28E-05 4.59E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 -2.56E-02 5.79E-03 -7.52E-04 4.28E-05 0.00E+00 0.00E+00 0.00E+00 S5 -6.38E-04 1.32E-04 -1.61E-05 8.66E-07 0.00E+00 0.00E+00 0.00E+00 S6 -5.92E-03 1.13E-03 -1.24E-04 6.00E-06 0.00E+00 0.00E+00 0.00E+00 S7 -4.27E-03 8.24E-04 -9.08E-05 4.37E-06 0.00E+00 0.00E+00 0.00E+00 S8 3.76E-05 -7.31E-06 9.80E-07 -5.82E-08 0.00E+00 0.00E+00 0.00E+00 S9 3.92E-05 -5.38E-06 4.23E-07 -1.45E-08 0.00E+00 0.00E+00 0.00E+00 S10 9.90E-06 -9.47E-07 5.19E-08 -1.24E-09 0.00E+00 0.00E+00 0.00E+00 S11 5.09E-04 -9.19E-05 1.19E-05 -1.08E-06 6.46E-08 -2.29E-09 3.64E-11 S12 -3.97E-05 6.65E-06 -7.89E-07 6.48E-08 -3.49E-09 1.11E-10 -1.57E-12

[0103] Figure 6 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 7 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 8 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.

[0104] according to Figures 6 to 8 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0105] Embodiment 2

[0106] like Figures 9 to 14 As shown, the optical imaging lens of the second embodiment is described. Fig. 9 A schematic diagram of the structure of the optical imaging lens of Example 2-1 is shown. Fig.10 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-2. Fig.11 A schematic structural diagram of the optical imaging lens of Example 2-3 is shown.

[0107] like Figures 9 to 11 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, and a sixth lens E6, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0.

[0108] like Fig. 9 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0109] like Fig.10 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-2. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0110] like Fig.11 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-3. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0111] In summary, the structural parameters of the optical imaging lens of the second embodiment in Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3 are shown in Table 5 (unit: mm).

[0112] Table 5

[0113] Parameters\Example 2-1 2-2 2-3 d3s 3.668 3.668 3.670 d3m 3.668 3.668 3.670 d4s 5.279 5.217 5.217 D4s 8.707 8.202 8.559 D4m 8.496 8.996 9.196 d5s 6.473 6.669 6.554 D5m 8.789 9.371 9.229 d0s 7.280 7.280 7.280 d0m 10.985 11.145 11.345 EP01 1.731 1.731 1.843 CP1 0.898 0.898 0.786 EP12 2.672 2.330 2.103 CP2 0.022 1.090 1.239 EP34 1.763 1.644 1.315 CP4 0.570 0.690 0.901 EP45 1.345 1.345 1.381 CP5 0.839 0.839 0.803 L 14.742 14.742 14.742 SG42 0.713 0.592 0.381

[0114] 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 convex 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 convex 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.

[0115] In the second embodiment, half of the maximum field of view Semi-FOV of the optical imaging lens is 57.10°, the effective focal length f of the optical imaging lens is 3.654 mm, the effective focal length f1 of the first lens is -6.178 mm, the effective focal length f2 of the second lens is 14.768 mm, the effective focal length f3 of the third lens is 3.347 mm, the effective focal length f4 of the fourth lens is -3.868 mm, the effective focal length f5 of the fifth lens is 3.861 mm, and the effective focal length f6 of the sixth lens is -5.689 mm.

[0116] Table 6 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0117] Table 6

[0118]

[0119] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirror surfaces S1-S12 in Example 2.

[0120] Table 7

[0121] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.43E-02 7.27E-03 -3.57E-03 1.52E-03 -4.92E-04 1.16E-04 -1.93E-05 S2 -1.72E-02 6.72E-03 -2.51E-03 7.25E-04 -1.16E-04 7.78E-06 8.35E-08 S3 -1.94E-03 -9.39E-04 2.03E-03 -1.95E-03 1.25E-03 -5.11E-04 1.28E-04 S4 1.68E-03 -1.90E-03 8.37E-03 -1.76E-02 2.31E-02 -1.92E-02 1.03E-02 S5 1.12E-02 -1.09E-02 2.86E-02 -4.87E-02 5.27E-02 -3.72E-02 1.74E-02 S6 5.42E-02 -9.07E-02 1.54E-01 -1.92E-01 1.68E-01 -1.01E-01 4.23E-02 S7 -2.36E-02 -4.29E-02 9.85E-02 -1.29E-01 1.13E-01 -6.76E-02 2.81E-02 S8 -7.87E-02 3.54E-02 -2.35E-02 1.63E-02 -1.06E-02 5.47E-03 -2.06E-03 S9 7.61E-03 -2.42E-03 9.19E-04 -1.76E-04 -3.65E-05 3.40E-05 -1.05E-05 S10 7.85E-03 -1.41E-02 9.01E-03 -3.84E-03 1.20E-03 -2.75E-04 4.55E-05 S11 1.52E-02 -2.39E-02 1.08E-02 -2.01E-03 -6.73E-04 6.89E-04 -2.92E-04 S12 -8.99E-03 -2.09E-02 1.97E-02 -1.31E-02 6.41E-03 -2.30E-03 6.03E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 2.21E-06 -1.65E-07 7.20E-09 -1.40E-10 0.00E+00 0.00E+00 0.00E+00 S2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 -1.76E-05 1.03E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 s4 -3.54E-03 7.47E-04 -8.84E-05 4.50E-06 0.00E+00 0.00E+00 0.00E+00 S5 -5.35E-03 1.04E-03 -1.15E-04 5.56E-06 0.00E+00 0.00E+00 0.00E+00 S6 -1.19E-02 2.17E-03 -2.29E-04 1.06E-05 0.00E+00 0.00E+00 0.00E+00 S7 -7.89E-03 1.43E-03 -1.51E-04 7.07E-06 0.00E+00 0.00E+00 0.00E+00 S8 5.30E-04 -8.86E-05 8.60E-06 -3.69E-07 0.00E+00 0.00E+00 0.00E+00 S9 1.85E-06 -1.95E-07 1.14E-08 -2.86E-10 0.00E+00 0.00E+00 0.00E+00 S10 -5.26E-06 4.01E-07 -1.80E-08 3.57E-10 0.00E+00 0.00E+00 0.00E+00 S11 8.10E-05 -1.59E-05 2.25E-06 -2.25E-07 1.51E-08 -6.09E-10 1.11E-11 S12 -1.15E-04 1.59E-05 -1.57E-06 1.08E-07 -4.94E-09 1.34E-10 -1.62E-12

[0122] Fig.12 The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focusing 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.

[0123] according to Figure 12 to Figure 14 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0124] Embodiment 3

[0125] like Figures 15 to 20 As shown, the optical imaging lens of embodiment 3 is described. Fig.15 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.16 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-2. Fig.17 A schematic structural diagram of the optical imaging lens of Example 3-3 is shown.

[0126] like Figures 15 to 17 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, and a sixth lens E6, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis of the lens barrel P0.

[0127] like Fig.15 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0128] like Fig.16 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-2. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0129] like Fig.17 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-3. In this example, the bearing contact mode of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0130] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 8 (unit: mm).

[0131] Table 8

[0132] Parameters\Example 3-1 3-2 3-3 d3s 3.644 3.660 3.612 d3m 3.644 3.660 3.612 d4s 4.978 5.135 5.135 D4s 8.456 8.656 8.942 D4m 8.808 9.104 9.404 d5s 6.709 6.835 6.686 D5m 9.135 9.054 9.572 d0s 7.418 7.280 7.702 d0m 11.009 10.976 11.276 EP01 1.731 1.674 1.821 CP1 0.759 0.816 1.084 EP12 2.811 2.833 2.565 CP2 0.022 0.022 0.022 EP34 1.563 1.811 1.479 CP4 0.839 0.664 0.847 EP45 0.838 0.910 1.020 CP5 0.897 1.072 0.793 L 14.742 14.306 14.452 SG42 0.561 0.664 0.461

[0133] In the third embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex 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 convex 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 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.

[0134] In Example 3, half of the maximum field of view Semi-FOV of the optical imaging lens is 56.54°, the total effective focal length f of the optical imaging lens is 3.581 mm, the effective focal length f1 of the first lens is -6.086 mm, the effective focal length f2 of the second lens is 12.062 mm, the effective focal length f3 of the third lens is 3.200 mm, the effective focal length f4 of the fourth lens is -3.337 mm, the effective focal length f5 of the fifth lens is 3.765 mm, and the effective focal length f6 of the sixth lens is -5.588 mm.

[0135] Table 9 shows a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters.

[0136] Table 9

[0137]

[0138] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface S1-S12 in Example 3.

[0139] Table 10

[0140] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.41E-02 7.54E-03 -3.45E-03 1.30E-03 -3.83E-04 8.41E-05 -1.34E-05 S2 -1.67E-02 6.83E-03 -2.16E-03 3.42E-04 3.15E-05 -1.88E-05 1.95E-06 S3 -2.03E-03 -1.62E-03 2.91E-03 -2.81E-03 1.78E-03 -7.21E-04 1.80E-04 S4 7.30E-03 -4.13E-02 1.46E-01 -3.15E-01 4.39E-01 -4.09E-01 2.56E-01 S5 7.21E-03 1.03E-02 -3.27E-02 5.43E-02 -5.73E-02 4.03E-02 -1.91E-02 S6 8.14E-02 -1.61E-01 2.65E-01 -3.21E-01 2.76E-01 -1.66E-01 7.01E-02 S7 -5.05E-03 -9.34E-02 1.77E-01 -2.17E-01 1.86E-01 -1.13E-01 4.83E-02 S8 -8.02E-02 3.96E-02 -3.09E-02 2.45E-02 -1.65E-02 8.35E-03 -3.01E-03 S9 7.89E-03 -2.72E-03 1.03E-03 -2.81E-04 4.57E-05 -1.92E-06 -9.44E-07 S10 7.39E-03 -1.28E-02 7.75E-03 -3.13E-03 9.17E-04 -1.95E-04 2.97E-05 S11 1.47E-02 -1.86E-02 2.84E-03 6.41E-03 -7.06E-03 4.13E-03 -1.62E-03 S12 -1.25E-02 -1.76E-02 1.82E-02 -1.30E-02 6.80E-03 -2.55E-03 6.90E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.50E-06 -1.11E-07 4.82E-09 -9.36E-11 0.00E+00 0.00E+00 0.00E+00 S2 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S3 -2.51E-05 1.49E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S4 -1.06E-01 2.81E-02 -4.28E-03 2.87E-04 0.00E+00 0.00E+00 0.00E+00 S5 6.02E-03 -1.21E-03 1.40E-04 -7.15E-06 0.00E+00 0.00E+00 0.00E++00 S6 -2.01E-02 3.73E-03 -4.04E-04 1.94E-05 0.00E+00 0.00E+00 0.00E+00 S7 -1.41E-02 2.69E-03 -3.01E-04 1.49E-05 0.00E+00 0.00E+00 0.00E+00 S8 7.44E-04 -1.20E-04 1.12E-05 -4.68E-07 0.00E+00 0.00E+00 0.00E+00 S9 2.36E-07 -2.62E-08 1.49E-09 -3.52E-11 0.00E+00 0.00E+00 0.00E+00 S10 -3.12E-06 2.13E-07 -8.41E-09 1.44E-10 0.00E+00 0.00E+00 0.00E+00 S11 4.47E-04 -8.88E-05 1.26E-05 -1.25E-06 8.16E-08 -3.17E-09 5.56E-11 S12 -1.35E-04 1.90E-05 -1.90E-06 1.33E-07 -6.08E-09 1.65E-10 -2.01E-12

[0141] Fig.18 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.19 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. 20 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.

[0142] according to Figures 18 to 20 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0143] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship shown in Table 11.

[0144] Table 11

[0145] Conditional formula\Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 CT5 / EP45 / 315 1.05 1.05 1.02 1.27 1.27 1.24 1.73 160 1.42 f4 / (EP34+CP4) -1.96 -2.05 -1.87 -1.66 -1.66 -1.75 -1.39 -1.35 -1.43 (D5m-d4s) / CP5 4.05 3.59 4.58 4.18 4.95 5.00 4.63 366 5.60 f4 / R8 / EP34 -0.88 —0.92 —0.84 —0.97 —1.04 -1.31 —0.95 -0.82 -1.00 f5 / (CT5 / EP45) 2.14 2.14 2.20 1.79 1.79 1.84 1.28 1.39 156 L / TAN(Semi-FOV) 10.43 10.43 10.43 9.54 9.54 9.54 9.74 9.45 9.55 dOm / dos 1.51 1.47 1.42 1.51 1.53 1.56 1.48 1.51 1.46 f5 / N5 / d5s 0.39 0.38 0.41 0.35 0.34 0.35 0.33 0.33 0.33 (D4m-d4s) / (D5m-d5s) 1.31 1.50 1.34 1.39 1.40 1.49 1.58 1.79 1.48 d3m / (D4s-d3s) 0.73 0.76 0.75 0.73 0.81 0.75 0.76 0.73 0.68 (EP12+EP45) / L 0.31 0.30 0.32 0.27 0.25 0.24 0.25 0.26 0.25 (CP2+CP5) / (T23+T56) 1.88 1.96 1.78 0.99 2.23 2.36 1.50 1.79 1.33 EP01 / (CPI+EP12) 0.69 0.76 0.63 0.48 0.54 0.64 0.48 0.46 0.50 (EP34+CP4) / SG42 2.52 2.41 2.62 3.27 3.94 5.82 4.28 3.73 5.05 SG42 / R8 0.34 0.34 0.34 0.32 0.26 0.17 0.25 0.29 0.20 CT2 / CT1 5.12 5.12 5.12 5.95 5.95 5.95 7.37 7.37 7.37 EP12 / EP01 1.43 1.31 1.58 1.54 1.35 1.14 1.62 1.69 1.41 L / (f×TAN(Semi-FOV)) 2.66 2.66 2.66 2.61 2.61 2.61 2.72 2.64 2.67 d5s / (f5 / CT5) 4.62 4.78 4.45 4.85 5.00 4.92 4.39 4.47 4.37

[0146] Table 12 shows the effective focal length of each lens of the optical imaging lens of Examples 1 to 3, half of the maximum field of view Semi-FOV of the optical imaging lens, and the total effective focal length f of the optical imaging lens.

[0147] Table 12

[0148] Optical parameters / Examples one two three Semi-FOV(°) 53.10 57.10 56.54 f(mm) 3.922 3.654 3.581 f1(mm) -6.703 -6.178 -6.086 f2(mm) 18.134 14.768 12.062 f3(mm) 3.483 3.347 3.200 f4(mm) -3.774 -3.868 -3.337 f5(mm) 3.802 3.861 3.765 f6(mm) -5.589 -5.689 -5.588

[0149] 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.

[0150] It should be noted that the reference wavelength of the optical imaging lens in the implementation manner of the present application is 555 nm, and the optical imaging lens of the present application may specifically be an infrared confocal lens with a maximum wavelength of 960 nm.

[0151] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0152] 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.

[0153] 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.

[0154] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: It includes a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group consists of six lenses. The six lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. The spacer element group includes a third spacer element placed on the image side of the third lens and in contact with the image side surface of the third lens, a fourth spacer element placed on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens. Among them, the center thickness CT5 of the fifth lens, the spacing distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis direction, and the refractive index N5 of the fifth lens satisfy: 1.00 < CT5 / EP45 / N5 < 1.75; the effective focal length f4 of the fourth lens, the spacing distance EP34 from the third spacer element to the fourth spacer element along the optical axis direction, and the maximum axial thickness CP4 of the fourth spacer element satisfy: -2.05 ≤ f4 / (EP34 + CP4) ≤ -1.35; the outer diameter D5m of the image side surface of the fifth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, and the maximum axial thickness CP5 of the fifth spacer element satisfy: 3.59 ≤ (D5m - d4s) / CP5 ≤ 5.

60.

2. The optical imaging lens according to claim 1, wherein: The effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, and the spacing distance EP34 from the third spacing element to the fourth spacing element along the optical axis satisfy: -1.35 mm -1 <f4 / R8 / EP34<-0.80mm -1 .

3. The optical imaging lens according to claim 1, wherein: The effective focal length f5 of the fifth lens, the center thickness CT5 of the fifth lens, and the spacing distance EP45 from the fourth spacer element to the fifth spacer element along the optical axis direction satisfy: 1.25 mm < f5 / (CT5 / EP45) < 2.22 mm.

4. The optical imaging lens according to claim 1, wherein: The maximum axial height L of the lens barrel and half of the maximum field of view angle Semi - FOV of the optical imaging lens satisfy: 9.40 mm < L / TAN(Semi - FOV) < 10.45 mm.

5. The optical imaging lens according to claim 1, wherein: The inner diameter d0m of the image side end face of the lens barrel and the inner diameter d0s of the object side end face of the lens barrel satisfy: 1.42 ≤ d0m / d0s ≤ 1.

56.

6. The optical imaging lens according to claim 1, wherein: The effective focal length f5 of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 0.33 ≤ f5 / N5 / d5s ≤ 0.

41.

7. The optical imaging lens according to claim 6, wherein: The outer diameter D4m of the image side surface of the fourth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, the outer diameter D5m of the image side surface of the fifth spacer element, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 1.30 < (D4m - d4s) / (D5m - d5s) < 1.

80.

8. The optical imaging lens according to claim 5, wherein: The object side surface of the third lens is convex, and the image side surface is convex; the inner diameter d3m of the image side surface of the third spacing element, the outer diameter D4s of the object side surface of the fourth spacing element and the inner diameter d3s of the object side surface of the third spacing element satisfy: 0.65 <d3m / (D4s-d3s)<0.85。 9. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. The spacing distance EP12 from the first spacing element to the second spacing element along the direction of the optical axis, the spacing distance EP45 from the fourth spacing element to the fifth spacing element along the direction of the optical axis and the maximum axial height L of the lens barrel satisfy the following: 0.24≤(EP12+EP45) / L≤0.32; The maximum axial thickness CP2 of the second spacer element, the maximum axial thickness CP5 of the fifth spacer element, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy the following: 0.95<(CP2+CP5) / (T23+T56)<2.

40.

10. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. The spacing distance EP01 from the object side end face of the lens barrel to the first spacing element along the direction of the optical axis, the maximum axial thickness CP1 of the first spacing element, and the spacing distance EP12 from the first spacing element to the second spacing element along the direction of the optical axis satisfy: 0.46≤EP01 / (CP1+EP12)≤0.

76.

11. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The spacing distance EP34 from the third spacing element to the fourth spacing element along the direction of the optical axis and the distance SG42 from the intersection of the maximum axial thickness CP4 of the fourth spacing element and the image side surface of the fourth lens on the optical axis to the object side surface of the fourth spacing element along the direction of the optical axis satisfy the following: 2.40<(EP34+CP4) / SG42<5.

85.

12. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The image side surface of the fourth lens is a concave surface; the distance SG42 from the intersection of the image side surface of the fourth lens on the optical axis to the object side surface of the fourth spacing element along the optical axis and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.15 <SG42 / R8<0.35。 13. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The spacer element group further includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens, and a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. The center thickness CT2 of the second lens satisfies the center thickness CT1 of the first lens: 5.10 <CT2 / CT1<7.40; The spacing distance EP12 from the first spacing element to the second spacing element along the direction of the optical axis and the spacing distance EP01 from the object side end surface of the lens barrel to the first spacing element along the direction of the optical axis satisfy: 1.10 <EP12 / EP01<1.70。 14. The optical imaging lens according to any one of claims 1 to 10, characterized in that: The object side surface of the first lens is convex, and the image side surface is concave; the image side surface of the second lens is convex; the object side surface of the fifth lens is convex, and the image side surface is convex; the object side surface of the sixth lens is convex, and the image side surface is concave.

Images