Optical imaging lens

Abstract

The utility model provides an optical imaging lens, which comprises a lens barrel, a lens group and a spacing element group, the center thickness CT3 of a third lens on an optical axis, the center thickness CT4 of a fourth lens on the optical axis, the air space T34 of the third lens and the fourth lens on the optical axis and the height L of the lens barrel meet the following formula: (CT3 + CT4 + T34) / Llt, 0.5 part; the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air interval T34 between the third lens and the fourth lens on the optical axis, and the interval distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element in the optical axis direction meet the following conditions:-90.0 lt; (f3-f4) / (T34 + EP34) lt; -75.0,-25.0; the air interval T34 between the third lens and the fourth lens on the optical axis and the interval distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element in the optical axis direction meet the following conditions: 6.5 lt; eP34 / T34lt, EP34 / 8.0). According to the utility model, the problem of unstable assembly caused by thickness reduction of the middle lens of the optical imaging lens in the prior art is solved.

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] In recent years, with the rapid development of science and technology, smart products have become an indispensable tool in people's daily lives. People have higher and higher requirements for the quality of photos taken by smart mobile terminals, which has also prompted major mobile phone manufacturers to have higher and higher requirements for the specifications of rear main cameras, which must not only ensure a small overall size and meet the requirements of thinness and lightness, but also have high imaging quality. Therefore, how to improve the imaging quality while ensuring the thinness of the camera lens, and reduce assembly risks, appearance interference and other issues is also one of the keys to the quality of the actual lens product.

[0003] Especially for multiple lenses, the lens in the middle is less sensitive than the lens at the edge. The lens in the middle of the optical imaging lens is thinned. However, thinning the middle lens is prone to cause assembly instability.

[0004] That is to say, in the prior art, the optical imaging lens has the problem of unstable assembly due to the thinning of the middle lens. Utility Model Content

[0005] The main purpose of the utility model is to provide an optical imaging lens to solve the problem of unstable assembly caused by thinning of the middle lens in the optical imaging lens in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, an optical imaging lens is provided, comprising: a lens barrel; a lens group, the lens group is accommodated in the lens barrel, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side along the optical axis; a spacer element group, the spacer element group is accommodated in the lens barrel, and the spacer element group includes a third spacer element, a fourth spacer element and a sixth spacer element, wherein the third spacer element is located between the third lens and the fourth lens and is in at least partial contact with the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and is in at least partial contact with the fifth lens, and the sixth spacer element is in at least partial contact with the image side surface of the sixth lens; between the first lens to the seventh lens, the air spacing between the third lens and the fourth lens on the optical axis is smaller than that between any other two adjacent lenses. The air interval of the lenses 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, the air interval T34 between the third lens and the fourth lens on the optical axis and the height L of the lens barrel satisfy: (CT3+CT4+T34) / L<0.5; the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air interval T34 between the third lens and the fourth lens on the optical axis, and the spacing distance EP34 along the optical axis direction between the image side surface of the third spacing element and the object side surface of the fourth spacing element satisfy: -90.0<(f3-f4) / (T34+EP34)<-75.0; the air interval T34 between the third lens and the fourth lens on the optical axis, and the spacing distance EP34 along the optical axis direction between the image side surface of the third spacing element and the object side surface of the fourth spacing element satisfy: 6.5 <EP34 / T34<8.0。

[0007] According to another aspect of the utility model, an optical imaging lens is provided, including a lens barrel and a lens group, wherein the lens group is accommodated in the lens barrel, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object side to the image side along the optical axis; and a spacer element group, wherein the spacer element group is accommodated in the lens barrel, and the spacer element group includes a third spacer element, a fourth spacer element, and a sixth spacer element, wherein the third spacer element is located between the third lens and the fourth lens and is in at least partial contact with the third lens, and the fourth spacer element is located between the fourth lens and the fifth lens and is in contact with the The fifth lens is at least partially in contact, and the sixth spacing element is at least partially in contact with the image side surface of the sixth lens; between the first lens to the seventh lens, the air spacing between the third lens and the fourth lens on the optical axis is smaller than the air spacing between any two adjacent lenses on the optical axis; the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: EP34<0.45mm, CT4 / EP34<1.7; the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 2.0 <f4 / f<3.0。

[0008] The present application provides a miniaturized, lightweight, seven-piece optical imaging lens. In order to meet the requirements of lightweight optical imaging lens and reduce the size of the optical imaging lens in the extension direction of the optical axis, the present application designs the third lens and the fourth lens at the non-sensitive position to be thinned, and sets the air interval between the third lens and the fourth lens on the optical axis to be smaller than the air interval between any two adjacent lenses on the optical axis, and limits EP34 to a range of less than 0.45 mm. The fourth lens has extremely high requirements, which makes it difficult to process and shape the fourth lens. At the same time, the fourth lens has insufficient bearing force on the lenses on both sides, which easily leads to the problem of unstable assembly. The present application limits the center thickness, effective focal length, effective focal length of the optical imaging lens, and the spacing distance between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis, which is beneficial to the rationality of the optical power distribution of the lens, the realization of small aberrations of the optical imaging lens, and the control of the ratio of the edge thickness and the middle thickness of the fourth lens, which is beneficial to the good processability of the fourth lens and the stability of the assembly of the fourth lens.

[0009] According to another aspect of the present utility model, an optical imaging lens is provided, which includes a lens barrel and a lens group. The lens group is accommodated 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, and a seventh lens from the object side to the image side along the optical axis direction; a spacer element group, the spacer element group is accommodated in the lens barrel, and the spacer element group includes a third spacer element, a fourth spacer element, and a sixth spacer element. The third spacer element is located between the third lens and the fourth lens and is at least partially in contact with the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and is at least partially in contact with the fifth lens. The sixth spacer element is at least partially in contact with the image side surface of the sixth lens; between the first lens and the seventh lens, the air gap on the optical axis between the third lens and the fourth lens is smaller than the air gap on the optical axis between any other two adjacent lenses. The air gap T34 on the optical axis between the third lens and the fourth lens and the interval distance EP34 in the optical axis direction between the image side surface of the third spacer element and the object side surface of the fourth spacer element satisfy: 6.5 < EP34 / T34 < 8.0; the effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy: f4 / L < 2.4.

[0010] This application provides an optical imaging lens with a seven-piece lens that is miniaturized and thin. In order to meet the requirement of thinning the optical imaging lens and reducing the size of the optical imaging lens in the extending direction of the optical axis, the third lens and the fourth lens at non-sensitive positions are thinned, and the air gap on the optical axis between the third lens and the fourth lens is set to be smaller than the air gap on the optical axis between any other two adjacent lenses, which may easily lead to problems such as poor imaging quality and appearance assembly of the optical imaging lens. However, through the relationship between the third lens, the fourth lens, the third spacer element, the fourth spacer element, and the length of the lens barrel, this application balances the low-order aberrations generated by the front-end optical system and the rear-end optical system, enabling the optical imaging lens to have good imaging quality while reducing the size of the system and maintaining the ultra-thinness of the system.

[0011] Further, the spacer element group further includes a first spacer element. The first spacer element is located between the first lens and the second lens and is at least partially in contact with the first lens. The interval distance EP01 in the optical axis direction from the object side end surface of the lens barrel to the object side surface of the first spacer element, the interval distance EP12 in the optical axis direction between the image side surface of the first spacer element and the object side surface of the second spacer element, the effective focal length f1 of the first lens, and the effective focal length f2 of the second lens satisfy: -1.0 < (EP01 + EP12) / (f1 + f2) < 0.

[0012] Furthermore, the air gap T23 between the second lens and the third lens on the optical axis, the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis, and the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -0.5<(T23+EP34) / (f2-f3)<0.5.

[0013] Further, the spacer element group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and at least partially contacts the fifth lens, and the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the spacing distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis direction satisfy: 1.6 <T67 / EP56<2.5。

[0014] Furthermore, the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: EP34<0.45mm, CT4 / EP34<1.7; the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 2.0 <f4 / f<3.0。

[0015] Furthermore, an effective focal length f4 of the fourth lens element and a height L of the lens barrel satisfy: f4 / L<2.4.

[0016] Further, the spacer element group further includes a second spacer element, the second spacer element is located between the second lens and the third lens and is in at least partial contact with the second lens, and a spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis and a combined focal length f23 of the second lens and the third lens satisfy: -32.0 <f23 / EP23<-20.0。

[0017] Furthermore, the spacer element group also includes a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and is at least partially in contact with the first lens, the second spacer element is located between the second lens and the third lens and is at least partially in contact with the second lens, and the refractive index N1 of the first lens, the refractive index N2 of the second lens, the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis, and the effective focal length f1 of the first lens satisfy: (N1+N2)*EP12 / |f1|<0.8.

[0018] Further, the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side of the third lens satisfy: 0 < R6 / f; the radius of curvature R6 of the image side of the third lens, the inner diameter d3m of the image side of the third spacer element, and the effective focal length f3 of the third lens satisfy: -10.0 mm < d3m / (R6 / f3) < -5.0 mm.

[0019] Further, the refractive index N4 of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the radius of curvature R7 of the object side of the fourth lens satisfy: 0 < N4*CT4 / R7 < 0.5; the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side of the fourth spacer element satisfy: 2.5 < f4 / d4s < 5.0.

[0020] Further, the spacer element group further includes a first spacer element and a second spacer element. The first spacer element is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer element is located between the second lens and the third lens and is at least partially in contact with the second lens. The radius of curvature R2 of the image side of the first lens and the radius of curvature R3 of the object side of the second lens satisfy: 1.0 < R2 / R3 < 1.5; the inner diameter d1m of the image side of the first spacer element and the inner diameter d2m of the image side of the second spacer element satisfy: 1.01 < d1m / d2m < 1.20.

[0021] Further, the spacer element group further includes a fifth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The axial spacing distance EP56 between the image side of the fifth spacer element and the object side of the sixth spacer element, the maximum axial thickness CP6 of the sixth spacer element, and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.90 < (EP56 + CP6) / T67 < 1.30.

[0022] Further, the inner diameter d0s of the object-side end face of the lens barrel, the inner diameter d0m of the image-side end face of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view Semi-FOV of the optical imaging lens satisfy: 1.0 < (d0m - d0s) / [f*tan(Semi-FOV)] < 1.5.

[0023] Further, the spacer element group further includes a sixth auxiliary spacer element located between the sixth spacer element and the seventh lens. The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: -2.0 < f6 / f7 < 0. The outer diameter D6m of the image side of the sixth spacer element, the outer diameter D6bs of the object side of the sixth auxiliary spacer element, and the inner diameter d6bs of the object side of the sixth auxiliary spacer element satisfy: 3.0 < D6m / (D6bs - d6bs) < 5.0.

[0024] Further, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens and the height L of the lens barrel satisfy: 0.1 < f456 / L < 1.0.

[0025] Further, the maximum effective radius DT42 of the image side of the fourth lens, the maximum effective radius DT51 of the object side of the fifth lens, and the outer diameter D4s of the object side of the fourth spacer element satisfy: 0.2 < (DT42 + DT51) / D4s < 0.7.

[0026] Applying the technical solution of the present utility model, the optical imaging lens includes a lens barrel and a lens group. The lens group is accommodated 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, and a seventh lens along the optical axis direction from the object side to the image side; a spacer element group, which is accommodated in the lens barrel. The spacer element group includes a third spacer element, a fourth spacer element, and a sixth spacer element. The third spacer element is located between the third lens and the fourth lens and is at least partially in contact with the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and is at least partially in contact with the fifth lens. The sixth spacer element is at least partially in contact with the image side of the sixth lens; between the first lens and the seventh lens, the air gap on the optical axis between the third lens and the fourth lens is smaller than the air gaps on the optical axis between any other two adjacent lenses; the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the height L of the lens barrel satisfy: (CT3 + CT4 + T34) / L < 0.5; the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the interval distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis direction satisfy: -90.0 < (f3 - f4) / (T34 + EP34) < -75.0; the air gap T34 between the third lens and the fourth lens on the optical axis, and the interval distance EP34 between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis direction satisfy: 6.5 < EP34 / T34 < 8.0.

[0027] The present application provides a miniaturized, lightweight, seven-lens optical imaging lens. In order to meet the requirements of lightweight optical imaging lens and reduce the size of optical imaging lens in the extension direction of optical axis, the present application designs the third lens and the fourth lens at the non-sensitive position to be thinned, and the middle thickness of the third lens and the fourth lens and the air gap between the two are limited to the range of (CT3+CT4+T34) / L<0.5. At the same time, the air gap between the third lens and the fourth lens on the optical axis is set to be smaller than the air gap between any two adjacent lenses on the optical axis, which causes the optical imaging lens to have poor imaging quality and appearance assembly problems. The present application balances the low-order aberrations generated by the front optical system and the back optical system by designing the relationship between the third lens, the fourth lens focal length, the air gap, and the third spacing element and the fourth spacing element, so that the optical imaging lens has good imaging quality. At the same time, the thickness of the third spacing element and the ratio of the center thickness of the lens can be reasonably controlled, so that the interference between the assembled thick lens and the effective diameter surface of the lens in the extension direction of the optical axis can be prevented, and the appearance problem and performance abnormality of the lens can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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:

[0029] Figure 1 A schematic diagram showing the structure of an optical imaging lens of an optional embodiment of the utility model is shown;

[0030] Figure 2 A schematic structural diagram of an optical imaging lens according to a first embodiment of the present utility model is shown;

[0031] Figures 3 to 6 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;

[0032] Figure 7 A schematic diagram showing the structure of an optical imaging lens according to a second embodiment of the present utility model is shown;

[0033] Figure 8 A schematic diagram showing the structure of an optical imaging lens according to a third embodiment of the present utility model is shown;

[0034] Figures 9 to 12 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the third embodiment of the utility model are respectively shown;

[0035] Fig.13 A schematic diagram showing the structure of an optical imaging lens according to a fourth embodiment of the present utility model is shown;

[0036] Fig.14 A schematic diagram of the structure of an optical imaging lens according to a fifth embodiment of the present utility model is shown;

[0037] Figures 15 to 18 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;

[0038] Fig.19 A schematic diagram showing the structure of an optical imaging lens according to a second embodiment of the present utility model is shown;

[0039] Fig. 20 A schematic structural diagram of an optical imaging lens according to a first embodiment of the present utility model is shown;

[0040] Figure 21 to Figure 24 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;

[0041] Fig.25 A schematic diagram showing the structure of an optical imaging lens according to a second embodiment of the present utility model is shown;

[0042] Fig.26 A stress distribution cloud diagram of an optical imaging lens according to an optional embodiment of the utility model when a 5N assembly force is applied axially;

[0043] Fig. 27 A stress distribution cloud diagram of an optical imaging lens according to an optional embodiment of the utility model when an assembly force of 10N is applied axially is shown;

[0044] Fig.28 The stress distribution cloud diagram of the optical imaging lens of the prior art solution 1 when a 5N assembly force is applied axially is shown;

[0045] Fig.29 The stress distribution cloud diagram of the optical imaging lens of the prior art solution 1 when a 10N assembly force is applied axially is shown;

[0046] Fig.30 The stress distribution cloud diagram of the optical imaging lens of the second prior art solution when a 5N assembly force is applied axially is shown;

[0047] Fig.31 The stress distribution cloud diagram of the optical imaging lens of the second prior art solution when a 10N assembly force is applied axially is shown;

[0048] The above drawings include the following reference numerals:

[0049] E1, first lens; P1, first spacer; E2, second lens; P2, second spacer; E3, third lens; P3, third spacer; E4, fourth lens; P4, fourth spacer; E5, fifth lens; P5, fifth spacer; E6, sixth lens; P6, sixth spacer; P6b, sixth auxiliary spacer; E7, seventh lens. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0056] In order to solve the problem of unstable assembly caused by thinning of the middle lens in the optical imaging lens in the prior art, the utility model provides an optical imaging lens.

[0057] First embodiment

[0058] like Figures 1 to 27 As shown, the optical imaging lens comprises a lens barrel and a lens group, the lens group is accommodated in the lens barrel, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side along the optical axis; a spacer element group, the spacer element group is accommodated in the lens barrel, the spacer element group comprises a third spacer element, a fourth spacer element and a sixth spacer element, wherein the third spacer element is located between the third lens and the fourth lens and is in at least partial contact with the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and is in at least partial contact with the fifth lens, and the sixth spacer element is in at least partial contact with the image side surface of the sixth lens; between the first lens to the seventh lens, the air spacing between the third lens and the fourth lens on the optical axis is smaller than the air spacing between any other two adjacent lenses on the optical axis; The center thickness CT3 of the three lenses on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the air interval T34 between the third lens and the fourth lens on the optical axis and the height L of the lens barrel satisfy: (CT3+CT4+T34) / L<0.5; the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air interval T34 between the third lens and the fourth lens on the optical axis, and the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis direction satisfy: -90.0<(f3-f4) / (T34+EP34)<-75.0; the air interval T34 between the third lens and the fourth lens on the optical axis, and the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis direction satisfy: 6.5 <EP34 / T34<8.0。

[0059] The present application provides an optical imaging lens with a seven-piece lens that is miniaturized and thin and light. In order to meet the requirement of making the optical imaging lens thin and light and reducing the size of the optical imaging lens in the extending direction of the optical axis, the third lens and the fourth lens at non-sensitive positions are thinned, and the center thicknesses of the third lens and the fourth lens and the air gap between them are limited within the range of (CT3 + CT4 + T34) / L < 0.5. At the same time, the air gap between the third lens and the fourth lens on the optical axis is set to be smaller than the air gaps between any other two adjacent lenses on the optical axis, which easily leads to problems such as poor imaging quality and appearance assembly of the optical imaging lens. However, through the design of the focal lengths of the third lens and the fourth lens, the air gap, and the relationship between the third spacer element and the fourth spacer element, the present application balances the low-order aberrations generated by the front-end optical system and the back-end optical system, enabling the optical imaging lens to have good imaging quality. At the same time, by reasonably controlling the ratio of the thickness of the third spacer element to the center thickness of the lens, it is possible to prevent interference between the assembled thick lens and the effective diameter surface of the lens in the extending direction of the optical axis, avoiding lens appearance problems and performance abnormality problems.

[0060] In the prior art solution 1 shown in Table 1, when the structure has EP34 / T34 less than 6.5 and assembly forces of 5N and 10N are applied axially, the average stresses borne by the edge parts of the sensitive lens are 0.90733N and 1.26185N respectively. The stress distribution diagrams when assembly forces of 5N and 10N are applied axially are as Fig.28 and Fig.29 shown.

[0061] In the prior art solution 1 shown in Table 1, when the structure has EP34 / T34 less than 8.0 and assembly forces of 5N and 10N are applied axially, the average stresses borne by the edge parts of the sensitive lens are 0.382019N and 1.13198N respectively. The stress distribution diagrams when assembly forces of 5N and 10N are applied axially are as Fig.30 and Fig.31 shown.

[0062] In the solution of the present application shown in Table 1, when the optical imaging lens has a structure satisfying 6.5 < EP34 / T34 < 8.0 and assembly forces of 5N and 10N are applied axially, the average stresses borne by the edge parts of the sensitive lens are 0.000242N and 0.001249N respectively. The stress distribution diagrams when assembly forces of 5N and 10N are applied axially are as Fig.26 and Fig. 27 shown. Compared with the prior art solution 1 and the prior art solution 2, it can be seen from the figure that during assembly, when different forces are applied, the stress distribution at the positions of the third lens and the fourth lens of the optical imaging lens in the solution of the present application is relatively uniform, without obvious deformation, and no interference occurs between the lenses.

[0063] Preferably, 0.1<(CT3+CT4+T34) / L<0.25,

[0064] Preferably, -88<(f3-f4) / (T34+EP34)<-76.

[0065] Preferably, 6.55 <EP34 / T34<7.9。

[0066] In this embodiment, the spacer element group also includes a first spacer element, the first spacer element is located between the first lens and the second lens and is in at least partial contact with the first lens, and the spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis, the spacing distance EP12 from the image side face of the first spacer element to the object side face of the second spacer element along the optical axis, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -1.0<(EP01+EP12) / (f1+f2)<0. By reasonably controlling this conditional expression, it is beneficial to the processing and molding requirements of the first lens and the second lens, it is beneficial to control the edge thickness of the first lens, reduce the molding difficulty of the first lens, and at the same time improve the influence of the first lens and the second lens on the aberration of the optical imaging lens, and improve the low-order aberration of the optical imaging lens. Preferably, -0.5<(EP01+EP12) / (f1+f2)<0.

[0067] In this embodiment, the air gap T23 between the second lens and the third lens on the optical axis, the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis, the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -0.5<(T23+EP34) / (f2-f3)<0.5. By controlling this conditional expression, it is helpful to control the edge thickness of the third lens and to ensure normal imaging of the optical imaging lens. Preferably, -0.3<(T23+EP34) / (f2-f3)<0.3.

[0068] In this embodiment, the spacer element group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The air gap T67 between the sixth lens and the seventh lens on the optical axis and the spacing distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis direction satisfy: 1.6 < T67 / EP56 < 2.5. By controlling this conditional expression, it is possible to prevent interference between the effective diameter surfaces of the sixth lens and the seventh lens in the optical axis direction after assembly, avoiding lens appearance problems and performance anomalies; at the same time, it helps to ensure the thickness and position of the fifth spacer element and the sixth spacer element, so as to effectively adjust the field curvature by adjusting the thickness of the spacer element at the sensitive position and improve the performance yield. Preferably, 1.62 < T67 / EP56 < 2.49.

[0069] In this embodiment, the spacing distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction and the central thickness CT4 of the fourth lens on the optical axis satisfy: EP34 < 0.45 mm, CT4 / EP34 < 1.7; the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 2.0 < f4 / f < 3.0. The edge thickness of the fourth lens is relatively small, which easily leads to difficult processing of the fourth lens. Such a setting is beneficial to ensuring the rationality of the optical power distribution of the lens, facilitating the optical imaging lens to achieve small aberrations, and reasonably controlling the ratio of the edge thickness to the central thickness of the fourth lens is beneficial to the fourth lens having good processability. Preferably, 1.4 < CT4 / EP34 < 1.7.

[0070] In this embodiment, the effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy: f4 / L < 2.4. By controlling the effective focal length of the fourth lens, it is ensured that the optical power distribution of each lens is reasonable, which is beneficial to the realization of small aberrations of the optical imaging lens; by controlling the ratio between the effective focal length of the fourth lens and the height of the lens barrel, it is beneficial to reduce the size of the system and maintain the ultra-thinness of the system. Preferably, 1.5 < f4 / L < 2.4.

[0071] In this embodiment, the spacer element group further includes a second spacer element, which is located between the second lens and the third lens and is at least partially in contact with the second lens. The spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction and the combined focal length f23 of the second lens and the third lens satisfy: -32.0 < f23 / EP23 < -20.0. By controlling this conditional expression, it helps to control the edge thickness of the third lens, reduce the difficulty of forming the third lens, reasonably control the combined focal length of the second lens and the third lens, and is beneficial to reducing the spherical aberration contribution of the first lens and achieving aberration correction of the optical imaging lens. Preferably, -31.0 < f23 / EP23 < -20.0.

[0072] In this embodiment, the spacer element group further includes a first spacer element and a second spacer element. The first spacer element is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer element is located between the second lens and the third lens and is at least partially in contact with the second lens. The refractive index N1 of the first lens, the refractive index N2 of the second lens, the axial spacing distance EP12 along the optical axis between the image side of the first spacer element and the object side of the second spacer element, and the effective focal length f1 of the first lens satisfy: (N1 + N2) * EP12 / |f1| < 0.8. By controlling the combination of the refractive indices of the first lens and the second lens and the ratio between the axial spacing distance along the optical axis between the image side of the first spacer element and the object side of the second spacer element and the effective focal length of the first lens within a reasonable range, it is beneficial to improve the lateral axial chromatic aberration and spherical aberration in the optical system. Preferably, 0 < (N1 + N2) * EP12 / |f1| < 0.4.

[0073] In this embodiment, the effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side of the third lens satisfy: 0 < R6 / f; the radius of curvature R6 of the image side of the third lens, the inner diameter d3m of the image side of the third spacer element, and the effective focal length f3 of the third lens satisfy: -10.0 mm < d3m / (R6 / f3) < -5.0 mm. Reasonably controlling the ratio of the radius of curvature of the image side of the third lens to the effective focal length of the optical imaging lens is beneficial to controlling the contribution of spherical aberration of the third lens. By controlling the inner diameter of the image side of the third spacer element, it is beneficial to improve the internal stray light between the third lens and the fourth lens. Preferably, 0 < R6 / f < 1.8, -10.0 mm < d3m / (R6 / f3) < -8.0 mm.

[0074] In this embodiment, the refractive index N4 of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the radius of curvature R7 of the object side of the fourth lens satisfy: 0 < N4 * CT4 / R7 < 0.5; the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side of the fourth spacer element satisfy: 2.5 < f4 / d4s < 5.0. By controlling the optical power of the fourth lens, the central thickness and surface shape on the optical axis are beneficial to balancing the aberrations generated by the front-end optical system and the back-end optical system of the system, and at the same time making the lens distribution uniform and the thickness reasonable, which is beneficial to processing. Preferably, 0 < N4 * CT4 / R7 < 0.05, 2.5 < f4 / d4s < 4.5.

[0075] In this embodiment, the spacer element group further includes a first spacer element and a second spacer element. The first spacer element is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer element is located between the second lens and the third lens and is at least partially in contact with the second lens. The following conditions are satisfied between the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens: 1.0 < R2 / R3 < 1.5; the following condition is satisfied between the inner diameter d1m of the image side surface of the first spacer element and the inner diameter d2m of the image side surface of the second spacer element: 1.01 < d1m / d2m < 1.20. Reasonably controlling this conditional expression is beneficial to improving the axial chromatic aberration of the optical imaging lens and the shape of the lens, enhancing the processability of the first lens processing, reducing the stray light caused by the positions of the first lens and the second lens to the optical imaging lens, and improving the imaging quality. Preferably, 1.0 < R2 / R3 < 1.3; 1.01 < d1m / d2m < 1.15.

[0076] In this embodiment, the spacer element group further includes a fifth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The following conditions are satisfied among the axial spacing distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element, the maximum thickness CP6 of the sixth spacer element in the axial direction, and the air spacing T67 between the sixth lens and the seventh lens on the optical axis: 0.90 < (EP56 + CP6) / T67 < 1.30. By reasonably controlling the edge thickness and the center thickness of the fifth lens, it is possible to ensure that the fifth lens has good processing feasibility, and effectively ensure the accuracy of the lens-to-lens abutting position after assembly, so that the parameters of the optical imaging lens meet the design requirements. By controlling the air spacing between the sixth lens and the seventh lens on the optical axis, it is beneficial to improving the consistency of the field curvature of the optical imaging lens. Preferably, 0.90 < (EP56 + CP6) / T67 < 1.28.

[0077] In this embodiment, the following conditions are satisfied among the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view Semi-FOV of the optical imaging lens: 1.0 < (d0m - d0s) / [f * tan(Semi-FOV)] < 1.5. By controlling the relationship between the inner diameter of the object side cross-section of the lens barrel, the inner diameter of the image side end surface of the lens barrel, and the image plane size, it is possible to ensure the large image plane requirement of the optical imaging lens, which is beneficial to ensuring that the optical imaging lens meets normal shooting. At the same time, under the condition of a fixed optical effective aperture, the better the thickness uniformity of the lens barrel wall, the more stable the reliability of the optical imaging lens. Preferably, 1.0 < (d0m - d0s) / [f * tan(Semi-FOV)] < 1.3.

[0078] In this embodiment, the spacer element group further includes a sixth auxiliary spacer element located between the sixth spacer element and the seventh lens. The ratio between the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfies: -2.0 < f6 / f7 < 0. The ratio between the outer diameter D6m of the image side surface of the sixth spacer element, the outer diameter D6bs of the object side surface of the sixth auxiliary spacer element, and the inner diameter d6bs of the object side surface of the sixth auxiliary spacer element satisfies: 3.0 < D6m / (D6bs - d6bs) < 5.0. Reasonably controlling the ratio between the effective focal length of the sixth lens and the effective focal length of the seventh lens is beneficial to adjusting the field curvature of the optical imaging lens. By controlling the relationship between the outer diameter of the image side surface of the sixth spacer element and the inner and outer diameters of the object side surface of the sixth auxiliary spacer element, the stability of the abutting position between the sixth lens and the seventh lens can be effectively ensured, which is beneficial to improving the overall assembly yield of the optical imaging lens. Preferably, -1.5 < f6 / f7 < -0.3; 3.0 < D6m / (D6bs - d6bs) < 4.8.

[0079] In this embodiment, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens and the height L of the lens barrel satisfy: 0.1 < f456 / L < 1.0. Controlling the ratio between the combined focal length of the fourth lens to the sixth lens of the optical imaging lens and the height of the lens barrel within a reasonable range can ensure a reasonable distribution of the optical power of the fourth lens to the sixth lens, which is beneficial to the realization of small aberration of the optical imaging lens. At the same time, it is also beneficial to reduce the height of the lens barrel and realize the thin and light of the optical imaging lens. Preferably, 0.5 < f456 / L < 1.0.

[0080] In this embodiment, the ratio between the maximum effective radius DT42 of the image side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens, and the outer diameter D4s of the object side surface of the fourth spacer element satisfies: 0.2 < (DT42 + DT51) / D4s < 0.7. Reasonably controlling the ratio between the maximum effective radius of the image side surface of the fourth lens, the maximum effective radius of the object side surface of the fifth lens, and the outer diameter of the object side surface of the fourth spacer element can effectively block the excess light at the edges of the fourth lens and the fifth lens, avoiding the generation of stray light. Preferably, 0.3 < (DT42 + DT51) / D4s < 0.6.

[0081] Second Embodiment

[0082] As Figures 1 to 27As shown, the optical imaging lens comprises a lens barrel and a lens group, the lens group is accommodated in the lens barrel, and the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side along the optical axis; a spacer element group, the spacer element group is accommodated in the lens barrel, the spacer element group comprises a third spacer element, a fourth spacer element and a sixth spacer element, wherein the third spacer element is located between the third lens and the fourth lens and is in at least partial contact with the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and is in at least partial contact with the fifth lens The sixth spacing element is in contact with the image side surface of the sixth lens at least partially; between the first lens to the seventh lens, the air spacing between the third lens and the fourth lens on the optical axis is smaller than the air spacing between any two adjacent lenses on the optical axis; the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: EP34<0.45mm, CT4 / EP34<1.7; the effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 2.0 <f4 / f<3.0。

[0083] The present application provides a miniaturized, lightweight, seven-piece optical imaging lens. In order to meet the requirements of lightweight optical imaging lens and reduce the size of the optical imaging lens in the extension direction of the optical axis, the present application designs the third lens and the fourth lens at the non-sensitive position to be thinned, and sets the air interval between the third lens and the fourth lens on the optical axis to be smaller than the air interval between any two adjacent lenses on the optical axis, and limits EP34 to a range of less than 0.45 mm. The fourth lens has extremely high requirements, which makes it difficult to process and shape the fourth lens. At the same time, the fourth lens has insufficient bearing force on the lenses on both sides, which easily leads to the problem of unstable assembly. The present application limits the center thickness, effective focal length, effective focal length of the optical imaging lens, and the spacing distance between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis, which is beneficial to the rationality of the optical power distribution of the lens, the realization of small aberrations of the optical imaging lens, and the control of the ratio of the edge thickness and the middle thickness of the fourth lens, which is beneficial to the good processability of the fourth lens and the stability of the assembly of the fourth lens.

[0084] Preferably, 1.4 <CT4 / EP34<1.7。

[0085] Third embodiment

[0086] like Figures 1 to 27As shown, the optical imaging lens includes a lens barrel and a lens group. The lens group is accommodated in the lens barrel. Along the optical axis direction, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from the object side to the image side; a spacer element group, which is accommodated in the lens barrel. The spacer element group includes a third spacer element, a fourth spacer element, and a sixth spacer element. The third spacer element is located between the third lens and the fourth lens and is at least partially in contact with the third lens. The fourth spacer element is located between the fourth lens and the fifth lens and is at least partially in contact with the fifth lens. The sixth spacer element is at least partially in contact with the image side surface of the sixth lens; between the first lens and the seventh lens, the air gap on the optical axis between the third lens and the fourth lens is smaller than the air gaps on the optical axis between any other two adjacent lenses; the air gap T34 on the optical axis between the third lens and the fourth lens and the interval distance EP34 in the optical axis direction between the image side surface of the third spacer element and the object side surface of the fourth spacer element satisfy: 6.5 < EP34 / T34 < 8.0; the effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy: f4 / L < 2.4.

[0087] This application provides an optical imaging lens with a miniaturized and thin seven - lens structure. In order to meet the requirements of making the optical imaging lens thinner and lighter and reducing the size of the optical imaging lens in the extending direction of the optical axis, the third lens and the fourth lens at non - sensitive positions are thinned. The air gap on the optical axis between the third lens and the fourth lens is set to be smaller than the air gaps on the optical axis between any other two adjacent lenses, which may easily lead to problems such as poor imaging quality and appearance assembly of the optical imaging lens. However, through the relationship between the third lens, the fourth lens, the third spacer element, the fourth spacer element, and the length of the lens barrel, this application balances the low - order aberrations generated by the front - end optical system and the back - end optical system, enabling the optical imaging lens to have good imaging quality while reducing the size of the system and maintaining the ultrathin nature of the system.

[0088] Preferably, 6.55 < EP34 / T34 < 7.9.

[0089] Preferably, 1.5 < f4 / L < 2.4.

[0090] Optionally, the above - mentioned optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The optical imaging lens in this application can use multiple lenses, such as the above - mentioned seven lenses. By reasonably allocating the effective focal lengths, surface shapes, central thicknesses of each lens, and the axial distances between each lens, etc., the aperture of the optical imaging lens can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the optical imaging lens more conducive to production and processing and applicable to portable electronic devices such as smart phones.

[0091] Preferably, the optical imaging lens in the present application is suitable for infrared light imaging.

[0092] 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. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0093] 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 seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0094] Figure 1 A schematic structural diagram of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d0m, d1s, and D2m are also indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the display of the optical imaging lens structure and the specific surface shape, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0095] Wherein, Dis refers to the outer diameter of the object side of the i-th spacer element, dis refers to the inner diameter of the object side of the i-th spacer element, Dim refers to the outer diameter of the image side of the i-th spacer element, dim refers to the inner diameter of the image side of the i-th spacer element, CPi refers to the maximum thickness of the i-th spacer element, that is, the maximum distance from the object side of the i-th spacer element to the image side along the optical axis, EPij refers to the distance between the image side of the i-th spacer element and the object side of the j-th spacer element along the optical axis, wherein i and j are positive integers greater than or equal to 1. And d0s is the inner diameter of the object side end face of the lens barrel, and D0m is the outer diameter of the image side end face of the lens barrel. The maximum height L of the lens barrel P0 refers to the maximum distance from the object side end face of the lens barrel P0 to the image side end face of the lens barrel P0 along the optical axis.

[0096] 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.

[0097] It should be noted that any one of the following embodiments 1 to 8 is applicable to all implementation methods of the present application.

[0098] Embodiment 1

[0099] like Figures 2 to 6 As shown, the optical imaging lens of the first embodiment of the present application is described.

[0100] like Figure 2 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a sixth auxiliary spacing element P6b, and a seventh lens E7.

[0101] like Figure 2 As shown, the object side surface of the first lens is S1, the image side surface of the first lens is S2, the object side surface of the second lens is S3, the image side surface of the second lens is S4, the object side surface of the third lens is S5, the image side surface of the third lens is S6, the object side surface of the fourth lens is S7, the image side surface of the fourth lens is S8, the object side surface of the fifth lens is S9, the image side surface of the fifth lens is S10, the object side surface of the sixth lens is S11, the image side surface of the sixth lens is S12, the object side surface of the seventh lens is S13, and the image side surface of the seventh lens is S14.

[0102] Table 1 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm).

[0103] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Aspheric 2.3427 0.8264 1.55 56.1 0.0128 S2 Aspheric 8.7425 0.0906 -1.7688 S3 Aspheric 7.9625 0.2900 1.68 19.2 -2.4530 S4 Aspheric 4.7821 0.3117 -0.4396 STO Spherical endless 0.1741 S5 Aspheric 17.1234 0.2901 1.68 19.2 -3.8863 S6 Aspheric 8.2020 0.0525 0.0000 S7 Aspheric 25.9792 0.6019 1.55 56.1 0.0000 S8 Aspheric -11.9219 0.4942 1.9601 S9 Aspheric 14.7172 0.4200 1.57 37.4 4.6989 S10 Aspheric 5.8241 0.2174 0.0000 S11 Aspheric 2.1384 0.4506 1.54 55.7 -0.9922 S12 Aspheric 9.7609 0.8163 0.7677 S13 Aspheric 11.9706 0.4573 1.54 55.7 0.1395 S14 Aspheric 1.9047 0.5556 -1.0054 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 0.3414 S17 Spherical endless

[0104] Table 1

[0105] Table 1 also shows the object side surface S5 of the filter, the image side surface S16 of the filter, and the imaging surface S17.

[0106] In this embodiment, the object side surfaces and image side surfaces of the first to fourth lenses 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:

[0107]

[0108] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical 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 aspherical surface. The following Table 2 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface in this embodiment.

[0109] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.6731E-03 -1.7735E-03 -1.5120E-03 -5.0423E-04 -1.5796E-04 -1.3665E-05 -8.5670E-06 S2 -4.5542E-02 8.1339E-03 -2.4391E-03 5.3563E-04 -4.8722E-05 -3.2480E-05 -2.9037E-05 S3 -1.3697E-02 2.0864E-02 -5.4866E-04 1.5195E-03 7.2571E-05 1.3536E-06 -3.5394E-05 S4 1.9623E-02 1.0716E-02 9.9374E-04 1.3090E-03 4.7427E-04 2.1007E-04 9.4937E-05 S5 -1.9245E-01 -8.0044E-03 7.7320E-04 1.3629E-03 5.8929E-04 2.0758E-04 7.8624E-05 S6 -2.4703E-01 1.2909E-02 4.6964E-03 1.8154E-03 8.7911E-04 1.5661E-05 -1.5654E-04 S7 -1.0695E-01 3.4136E-02 3.9618E-03 1.7970E-03 1.0054E-03 -7.3646E-04 -4.1965E-04 S8 -2.4375E-01 1.8629E-02 1.4029E-02 9.6147E-03 4.9951E-03 1.7536E-03 -1.0982E-04 S9 -7.5840E-01 -2.3745E-02 1.0971E-02 2.2879E-02 5.7264E-03 1.9380E-03 -1.9504E-03 S10 -1.4633E+00 4.1999E-01 -8.0639E-02 -6.0092E-04 -1.2940E-02 9.3499E-03 -6.3754E-04 S11 -3.3175E+00 5.4659E-01 1.1764E-01 -6.6818E-02 -2.1114E-02 1.1432E-02 6.6911E-03 S12 -1.1988E+00 -1.8443E-01 1.7753E-01 -4.8336E-02 4.4834E-02 -1.3358E-02 6.4908E-03 S13 -2.3439E+00 1.1020E+00 -4.8859E-01 2.3742E-01 -1.2493E-01 4.7510E-02 -7.8741E-03 S14 -6.9776E+00 1.6544E+00 -4.5095E-01 2.1558E-01 -1.0740E-01 3.4664E-02 -2.7843E-02 Face number A18 A20 A22 A22 A26 A28 A30 S1 3.5399E-06 -2.6755E-07 9.1831E-07 1.5058E-06 5.8032E-07 1.6173E-07 -2.7397E-08 S2 -2.2424E-05 -4.9137E-06 -2.1765E-06 1.7648E-06 1.4261E-06 2.0797E-06 -3.6647E-07 S3 -2.2982E-05 -1.4289E-05 -5.5050E-06 -6.9541E-06 -1.5310E-06 -2.0363E-06 2.3302E-06 S4 3.1858E-05 1.4082E-05 6.3704E-07 -2.3769E-06 -4.8457E-06 -1.7869E-06 -1.6772E-07 S5 1.4217E-05 1.2032E-05 5.7876E-07 6.6772E-06 2.3094E-06 9.2078E-07 -2.3999E-06 S6 -5.2334E-05 4.3130E-05 -1.3796E-05 1.3900E-05 6.0109E-07 2.6582E-06 -2.8514E-06 S7 1.1666E-04 5.8357E-05 -2.4756E-05 2.7480E-05 -7.9709E-06 -1.0260E-05 1.6073E-06 S8 -4.1833E-04 -3.5724E-04 -1.8248E-04 -7.9108E-05 -4.5441E-06 1.2038E-05 1.3240E-05 S9 -1.7663E-03 -9.2298E-04 -1.1096E-04 1.2283E-04 9.9028E-05 2.8927E-05 -2.0940E-06 S10 -1.2581E-03 -2.9226E-04 1.8329E-04 4.9842E-05 1.3118E-05 1.7209E-05 -2.5943E-06 S11 -2.6574E-03 -1.1091E-03 -1.4415E-04 4.8065E-05 3.7883E-04 1.1260E-05 -1.1077E-04 S12 -4.6635E-04 1.6808E-03 -9.6384E-04 -8.5070E-04 1.3949E-04 -1.8870E-04 8.8668E-05 S13 -3.7472E-03 1.0578E-03 1.7266E-03 -1.7503E-03 8.4671E-04 -2.0755E-04 7.3906E-05 S14 1.2080E-02 -2.7907E-03 3.3002E-03 -2.3452E-03 5.2729E-04 -5.8963E-04 5.8710E-04

[0110] Table 2

[0111] Figure 3 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the focal point deviation of light of different wavelengths after passing through the optical imaging lens. Figure 4 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 5 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 6 The magnification chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0112] according to Figures 3 to 6 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0113] Embodiment 2

[0114] The difference from the first embodiment is that the parameters of the lens barrel P0 and the spacer element are different.

[0115] like Figure 7 As shown, the optical imaging lens of the second embodiment of the present application is described. For the sake of brevity, some descriptions similar to the first embodiment will be omitted.

[0116] The parameters of the optical imaging lens of the second embodiment and the first embodiment are the same in terms of the radius of curvature, center thickness, and spacing distances between lenses, as well as high-order image coefficients, as shown in Table 1 and Table 2, but the parameters such as the lens barrel P0, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, the distance between the spacing elements, and the edge thickness of the lens are different. Therefore, the imaging quality of the optical imaging lens of this embodiment is as follows: Figures 3 to 6 shown.

[0117] Embodiment 3

[0118] The difference from the first embodiment is that some parameters of the lens barrel P0, the spacer element and the lens are different.

[0119] like Figures 8 to 12 As shown, the optical imaging lens of the third embodiment of the present application is described.

[0120] like Figure 8 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a sixth auxiliary spacing element P6b, and a seventh lens E7.

[0121] Table 3 shows the basic structural parameters of the optical imaging lens of Example 3, wherein the units of the curvature radius, thickness / distance, and effective focal length are all in millimeters (mm).

[0122] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Aspheric 2.3445 0.8171 1.55 56.1 0.0155 S2 Aspheric 6.9733 0.0917 -2.1112 S3 Aspheric 6.4798 0.2914 1.68 19.2 -2.3008 S4 Aspheric 4.8232 0.3156 -0.4396 STO Spherical endless 0.1780 S5 Aspheric 17.7189 0.2884 1.68 19.2 -3.3385 S6 Aspheric 8.1463 0.0536 0.1402 S7 Aspheric 26.5541 0.6017 1.55 56.1 -4.6951 S8 Aspheric -11.6520 0.4927 1.6251 S9 Aspheric 14.6414 0.4175 1.57 37.4 2.8397 S10 Aspheric 5.8263 0.2162 0.0230 S11 Aspheric 2.1418 0.4479 1.54 55.7 -0.9922 S12 Aspheric 9.8346 0.8109 0.7721 S13 Aspheric 11.8295 0.4411 1.54 55.7 0.2230 S14 Aspheric 1.9003 0.5431 -1.0055 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 0.3288 S17 Spherical endless

[0123] Table 3

[0124] Table 4 shows the cone coefficients and higher-order coefficients that can be used for the aspheric mirror surfaces S4-S14 in the third embodiment.

[0125]

[0126]

[0127] Table 4

[0128] Fig. 9 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates that the focusing point of light with different wavelengths after passing through the optical imaging lens will deviate. Fig.10 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.11 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.12 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.

[0129] according to Figures 9 to 12 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0130] Embodiment 4

[0131] The difference from the third embodiment is that the parameters of the lens barrel P0 and the spacer element are different.

[0132] like Fig.13 As shown, the optical imaging lens of the fourth embodiment of the present application is described. For the sake of brevity, some descriptions similar to those of the third embodiment will be omitted.

[0133] The parameters of the optical imaging lens of the fourth embodiment to the seventh lens, such as the radius of curvature, the center thickness, the spacing distance between the lenses, and the high-order image coefficients are the same as those of the third embodiment, as shown in Table 3 and Table 4, but the parameters such as the lens barrel P0, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, the distance between the spacing elements, and the edge thickness of the lens are different. Therefore, the imaging quality of the optical imaging lens of this embodiment is as follows: Figures 9 to 12 shown.

[0134] Embodiment 5

[0135] The difference from the first embodiment is that some parameters of the lens barrel P0, the spacer element and the lens are different.

[0136] like Figures 14 to 18 As shown, the optical imaging lens of the fifth embodiment of the present application is described.

[0137] like Fig.14 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a sixth auxiliary spacing element P6b, and a seventh lens E7.

[0138] Table 5 shows the basic structural parameters of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all in millimeters (mm).

[0139] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Aspheric 2.3435 0.8161 1.55 56.1 0.0120 S2 Aspheric 8.3738 0.0856 -1.6738 S3 Aspheric 7.7147 0.2874 1.68 19.2 -2.5416 S4 Aspheric 4.8324 0.3057 -0.4391 STO Spherical endless 0.1681 S5 Aspheric 17.5000 0.2895 1.68 19.2 -0.9755 S6 Aspheric 8.6570 0.0528 -0.2421 S7 Aspheric 31.0922 0.6297 1.55 56.1 -19.0464 S8 Aspheric -7.3855 0.4928 -1.7844 S9 Aspheric 28.0449 0.4005 1.57 37.4 -1.1251 S10 Aspheric 4.7237 0.2206 -0.0771 S11 Aspheric 2.1281 0.4516 1.54 55.7 -0.9929 S12 Aspheric 12.9469 0.7965 1.0561 S13 Aspheric 13.3431 0.4419 1.54 55.7 0.6855 S14 Aspheric 1.9557 0.5475 -1.0131 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 0.3332 S17 Spherical endless

[0140] Table 5

[0141] Table 6 shows the cone coefficients and higher-order coefficients that can be used for the aspherical mirror surfaces S4-S14 in Example 5.

[0142]

[0143]

[0144] Table 6

[0145] Fig.15 The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates that the focusing point of light with different wavelengths after passing through the optical imaging lens will deviate. Fig.16 The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.17 The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.18 The magnification chromatic aberration curve of the optical imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0146] according to Figures 15 to 18 It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0147] Embodiment 6

[0148] The difference from the fifth embodiment is that the parameters of the lens barrel P0 and the spacer element are different.

[0149] like Fig.19 As shown, the optical imaging lens of the sixth embodiment of the present application is described. For the sake of brevity, some descriptions similar to those of the fifth embodiment will be omitted.

[0150] The parameters of the optical imaging lens of Example 6 to Example 5, such as the radius of curvature, center thickness, and the spacing distance between the lenses, and the high-order image coefficients, are the same as those of Example 5, as shown in Table 5 and Table 6, but the parameters such as the lens barrel P0, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, the distance between the spacing elements, and the edge thickness of the lens are different. Therefore, the imaging quality of the optical imaging lens of this embodiment is as follows: Figures 15 to 18 shown.

[0151] Embodiment 7

[0152] The difference from the first embodiment is that some parameters of the lens barrel P0, the spacer element and the lens are different.

[0153] like Figure 20 to Figure 24 As shown, the optical imaging lens of the seventh embodiment of the present application is described.

[0154] like Fig. 20 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a sixth auxiliary spacing element P6b, and a seventh lens E7.

[0155] Table 7 shows a basic structural parameter table of the optical imaging lens of Example 7, wherein the units of the radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0156] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless S1 Aspheric 2.3491 0.8140 1.55 56.1 0.0188 S2 Aspheric 10.2846 0.0906 -2.1009 S3 Aspheric 9.5060 0.2902 1.68 19.2 -1.7713 S4 Aspheric 4.8949 0.3094 -0.5387 STO Spherical endless 0.1719 S5 Aspheric 16.5217 0.2890 1.68 19.2 -0.9516 S6 Aspheric 7.7166 0.0543 0.0620 S7 Aspheric 22.2855 0.6059 1.55 56.1 -22.4329 S8 Aspheric -12.2736 0.5071 1.9119 S9 Aspheric 15.2130 0.4171 1.57 37.4 6.1259 S10 Aspheric 5.7650 0.1899 -0.1653 S11 Aspheric 2.0662 0.4584 1.54 55.7 -0.9885 S12 Aspheric 7.3950 0.8024 -0.7403 S13 Aspheric 7.5455 0.3587 1.54 55.7 -3.8969 S14 Aspheric 3.0837 0.5759 -0.8929 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 0.3616 S17 Spherical endless

[0157] Table 7

[0158] Table 8 gives the cone coefficients and higher-order coefficients that can be used for the aspheric mirror surfaces S4-S14 in Example 7.

[0159]

[0160]

[0161] Table 8

[0162] Fig.21The axial chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates that the focusing point of light with different wavelengths after passing through the optical imaging lens will deviate. Fig. 22 The astigmatism curve of the optical imaging lens of Example 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.23 The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.24 The magnification chromatic aberration curve of the optical imaging lens of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0163] according to Figure 21 to Figure 24 It can be seen that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0164] Embodiment 8

[0165] The difference from the seventh embodiment is that the parameters of the lens barrel P0 and the spacer element are different.

[0166] like Fig.25 As shown, the optical imaging lens of the eighth embodiment of the present application is described. For the sake of brevity, some descriptions similar to those of the seventh embodiment will be omitted.

[0167] The parameters of the optical imaging lens of Example 8 to Example 7, such as the radius of curvature, center thickness, and the spacing distance between the lenses, and the high-order image coefficients, are the same as those of Example 7, as shown in Table 7 and Table 8, but the parameters such as the lens barrel P0, the thickness of the spacing element, the inner diameter of the spacing element, the outer diameter of the spacing element, the distance between the spacing elements, and the edge thickness of the lens are different. Therefore, the imaging quality of the optical imaging lens of this embodiment is as follows: Figure 21 to Figure 24 shown.

[0168] In summary, embodiments 1 to 8 respectively satisfy the relationship shown in Table 9.

[0169]

[0170]

[0171] Tables 9 and 10 give some parameters of the optical imaging lenses of Examples 1 to 9.

[0172] Basic data / Example 1 2 3 4 5 6 7 8 DT42 1.7934 1.7934 1.787 1.787 1.7398 1.7398 1.7581 1.7581 DT51 2.066 2.066 2.0407 2.0407 1.9574 1.9574 2.0371 2.0371 d1m 2.9472 2.9715 2.9378 2.9626 2.9276 2.9602 2.8055 2.8056 d2m 2.6844 2.697 2.6931 2.6897 2.6778 2.6665 2.636 2.636 d3m 3.1486 3.1811 3.2204 3.2197 3.1092 3.1215 3.1468 3.1358 d4s 3.7176 3.7176 3.7255 3.7255 3.6528 3.6528 3.6006 3.6006 D4s 6.6664 6.6664 6.6664 6.6664 6.8664 6.8664 6.8664 6.8664 D6m 8.7064 8.7064 8.7064 8.7064 8.9064 8.9064 8.9064 8.9064 d0s 5.714 5.714 5.714 5.714 5.8435 5.914 5.914 5.914 d0m 11.0064 11.0064 11.0064 10.94 11.1664 11.2064 11.2064 11.2064 EP01 1.0057 0.9657 1.0457 1.0025 1.0757 1.0204 1.0232 1.0231 EP12 0.473 0.531 0.5022 0.5453 0.4717 0.501 0.5307 0.5309 EP23 0.4176 0.4171 0.4169 0.4207 0.3857 0.4089 0.4331 0.4269 EP34 0.4096 0.392 0.377 0.3773 0.4211 0.4159 0.3591 0.3653 EP56 0.4839 0.4839 0.4439 0.4839 0.3216 0.3225 0.486 0.4585 CP6 0.52 0.52 0.52 0.52 0.41 0.41 0.52 0.52 L 6.35 6.35 6.35 6.31 6.33 6.35 6.35 6.35 d6bs 7.7461 7.7461 7.6372 7.6372 7.3544 7.3439 7.9743 7.9743 D6b 10.1025 10.1025 9.5025 10.1025 10.3025 10.3025 10.3025 10.3025

[0173] Tables 10 and 11 show the effective focal lengths of the first lens to the fourth lens of the optical imaging lenses of Examples 1 to 9.

[0174]

[0175]

[0176] Table 11

[0177] Table 12 shows a comparison between the optical imaging lens in the prior art and the optical imaging lens of the present application.

[0178] Conditions / Schemes Existing technical solution 1 Existing technical solution 2 This application plan EP34 / T34 4.76 9.52 7.8 Axial stress of 5N 0.90733N 0.382019N 0.000242N Axial stress of 10N 1.26185N 1.13198N 0.001249N

[0179] Table 12

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

[0181] Obviously, the 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.

[0182] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

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

[0184] The above description is only 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: include: Lens tube; A lens group, the lens group is accommodated in the lens barrel, and the lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side along the optical axis; a spacer element group, the spacer element group is accommodated in the lens barrel, the spacer element group includes a third spacer element, a fourth spacer element, and a sixth spacer element, wherein the third spacer element is located between the third lens and the fourth lens and is in at least partial contact with the third lens, the fourth spacer element is located between the fourth lens and the fifth lens and is in at least partial contact with the fifth lens, and the sixth spacer element is in at least partial contact with the image side surface of the sixth lens; Between the first lens to the seventh lens, the air interval between the third lens and the fourth lens on the optical axis is smaller than the air interval between any two adjacent lenses 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, the air interval T34 between the third lens and the fourth lens on the optical axis, and the height of the lens barrel L satisfies: (CT3+CT4+T34) / L<0.5; The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the air interval T34 between the third lens and the fourth lens on the optical axis, and the interval distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis satisfy the following: -90.0<(f3-f4) / (T34+EP34)<-75.0; The air gap T34 between the third lens and the fourth lens on the optical axis, and the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis direction satisfy: 6.5 <EP34 / T34<8.0。 2. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a first spacer element and a second spacer element, the first spacer element is located between the first lens and the second lens and is in at least partial contact with the first lens, the second spacer element is located between the second lens and the third lens and is in at least partial contact with the second lens, and the spacing distance EP01 from the object side end face of the lens barrel to the object side face of the first spacer element along the optical axis, the spacing distance EP12 from the image side face of the first spacer element to the object side face of the second spacer element along the optical axis, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -1.0<(EP01+EP12) / (f1+f2)<0.

3. The optical imaging lens according to claim 1, wherein: The air gap T23 between the second lens and the third lens on the optical axis, the spacing distance EP34 between the image side surface of the third spacing element and the object side surface of the fourth spacing element along the optical axis, and the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the following: -0.5<(T23+EP34) / (f2-f3)<0.

5.

4. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element, which is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The air gap T67 between the sixth lens and the seventh lens on the optical axis and the distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element in the optical axis direction satisfy: 1.6 < T67 / EP56 < 2.

5.

5. The optical imaging lens according to claim 1, wherein: The distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element in the optical axis direction and the central thickness CT4 of the fourth lens on the optical axis satisfy: EP34 < 0.45 mm, CT4 / EP34 < 1.7; The effective focal length f4 of the fourth lens and the effective focal length f of the optical imaging lens satisfy: 2.0 < f4 / f < 3.

0.

6. The optical imaging lens according to claim 1, wherein: The effective focal length f4 of the fourth lens and the height L of the lens barrel satisfy: f4 / L < 2.

4.

7. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a second spacer element, which is located between the second lens and the third lens and is at least partially in contact with the second lens. The distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction and the combined focal length f23 of the second lens and the third lens satisfy: -32.0 < f23 / EP23 < -20.

0.

8. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a first spacer element and a second spacer element. The first spacer element is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer element is located between the second lens and the third lens and is at least partially in contact with the second lens. The refractive index N1 of the first lens, the refractive index N2 of the second lens, the distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction, and the effective focal length f1 of the first lens satisfy: (N1 + N2)*EP12 / |f1| < 0.

8.

9. The optical imaging lens according to claim 1, wherein: The effective focal length f of the optical imaging lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 0 < R6 / f; The radius of curvature R6 of the image side surface of the third lens, the inner diameter d3m of the image side surface of the third spacer element, and the effective focal length f3 of the third lens satisfy: -10.0 mm < d3m / (R6 / f3) < -5.0 mm.

10. The optical imaging lens according to claim 1, wherein: The refractive index N4 of the fourth lens, the central thickness CT4 of the fourth lens on the optical axis, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0 < N4*CT4 / R7 < 0.5; The effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: 2.5 < f4 / d4s < 5.

0.

11. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a first spacer element and a second spacer element. The first spacer element is located between the first lens and the second lens and is at least partially in contact with the first lens. The second spacer element is located between the second lens and the third lens and is at least partially in contact with the second lens. The following conditions are satisfied between the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens: 1.0 < R2 / R3 < 1.5; the following conditions are satisfied between the inner diameter d1m of the image side surface of the first spacer element and the inner diameter d2m of the image side surface of the second spacer element: 1.01 < d1m / d2m < 1.

20.

12. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The spacer element group further includes a fifth spacer element. The fifth spacer element is located between the fifth lens and the sixth lens and is at least partially in contact with the fifth lens. The following conditions are satisfied among the axial spacing distance EP56 between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis, the maximum thickness CP6 of the sixth spacer element along the optical axis, and the air spacing T67 between the sixth lens and the seventh lens on the optical axis: 0.90 < (EP56 + CP6) / T67 < 1.

30.

13. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The following conditions are satisfied among the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, the effective focal length f of the optical imaging lens, and half of the maximum field of view Semi-FOV of the optical imaging lens: 1.0 < (d0m - d0s) / [f * tan(Semi-FOV)] < 1.

5.

14. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The spacer element group further includes a sixth auxiliary spacer element. The sixth auxiliary spacer element is located between the sixth spacer element and the seventh lens. The following conditions are satisfied between the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens: -2.0 < f6 / f7 < 0; the following conditions are satisfied among the outer diameter D6m of the image side surface of the sixth spacer element, the outer diameter D6bs of the object side surface of the sixth auxiliary spacer element, and the inner diameter d6bs of the object side surface of the sixth auxiliary spacer element: 3.0 < D6m / (D6bs - d6bs) < 5.

0.

15. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The following conditions are satisfied between the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens and the height L of the lens barrel: 0.1 < f456 / L < 1.

0.

16. The optical imaging lens according to any one of claims 1 to 11, characterized in that: The following conditions are satisfied between the maximum effective radius DT42 of the image side surface of the fourth lens, the maximum effective radius DT51 of the object side surface of the fifth lens, and the outer diameter D4s of the object side surface of the fourth spacer element: 0.2 < (DT42 + DT51) / D4s < 0.7.

Images