Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and a spacing element group, and the lens group and the spacing element group are arranged in the lens barrel. The seven lenses are sequentially a first lens with negative focal power, a second lens with focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with focal power, a sixth lens with positive focal power and a seventh lens with negative focal power; the following conditions are satisfied: 54.95 degree lt; the Semi-FOV is less than or equal to 61.10 degrees; the following conditions are satisfied:-0.45 lt; cT1 / (R2-R1) lt; 0.05 of the total weight; the following conditions are satisfied:-2.40 lt; (d0s-d1s) / (R2-R1) lt; and 0.20%. According to the invention, the problem of field curvature offset caused by steep light trend due to control of the structure of the front-end lens in a seven-piece large-field-angle optical imaging lens in the prior art is solved.

Description

Technical Field

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

[0002] In the field of optical imaging technology, seven-element optical imaging lenses are widely used due to their excellent imaging performance, especially in the fields of mobile electronic devices, security monitoring, and vehicle-mounted cameras. However, with the continuous changes in market demand, the requirements for the field of view of optical imaging lenses are getting higher and higher, and new requirements are put forward for the clarity and high resolution of optical imaging lenses.

[0003] At present, the existing seven-element optical imaging lens with a large field of view controls the structure of the front-end lens. For example, under the influence of the front-end lens surface shape, the incident light passes through the front-end lens in a steeper direction, which can easily cause the field curvature offset problem, increase the sensitivity of the optical imaging lens, and seriously affect the stability of the overall performance.

[0004] That is to say, in the prior art, the seven-element optical imaging lens with a large field of view has a problem of field curvature deviation due to the control of the structure of the front-end lens, which causes the light to travel steeper. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the structure of the front-end lens is controlled, which causes the light to travel steeply and thus causes field curvature deviation in the existing seven-lens optical imaging lens with a large field of view.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an optical imaging lens, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of seven lenses. The seven lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative focal power, a second lens with a focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a focal power, a sixth lens with a positive focal power, and a seventh lens with a negative focal power; the image side surface of the first lens is concave; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave; there is an air gap between each adjacent two of the first lens to the seventh lens; the spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 54.95° < Semi-FOV ≤ 61.10°; the relationship among the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -0.45 < CT1 / (R2 - R1) < 0.05; the relationship among the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -2.40 < (d0s - d1s) / (R2 - R1) < 0.20.

[0007] According to another aspect of the present invention, an optical imaging lens is further provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of seven lenses. The seven lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with an optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power; the image side surface of the first lens is concave; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave; there is an air gap between every two adjacent lenses among the first lens to the seventh lens; the spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the maximum half field of view Semi-FOV of the optical imaging lens satisfies: 54.95° < Semi-FOV ≤ 61.10°; the relationship among the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -0.45 < CT1 / (R2 - R1) < 0.05; the relationship between the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfies: -3.00 < f1 / d1s < -2.65.

[0008] According to another aspect of the present invention, an optical imaging lens is further provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of seven lenses. The seven lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative focal power, a second lens with a focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a focal power, a sixth lens with a positive focal power, and a seventh lens with a negative focal power; the image side surface of the first lens is concave; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave; there is an air gap between adjacent two of the first lens to the seventh lens; the spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 54.95° < Semi-FOV ≤ 61.10°; the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -0.45 < CT1 / (R2 - R1) < 0.05; the inner diameter d1s of the object side surface of the first spacer element and the curvature radius R2 of the image side surface of the first lens satisfy: 0.45 < d1s / R2 < 0.70.

[0009] Further, the effective radius DT72 of the image side surface of the seventh lens, the effective radius DT11 of the object side surface of the first lens, the inner diameter d0m of the image side surface of the lens barrel, and the inner diameter d0s of the object side surface of the lens barrel satisfy: 4.05 < d0s / DT11 + d0m / DT72 < 5.90.

[0010] Further, the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfy: -3.00 < f1 / d1s < -2.65.

[0011] Further, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens. The maximum axial height L of the lens barrel, the interval distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, and the interval distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element satisfy: 2.45 < L / (EP01 + EP12) ≤ 3.30.

[0012] Furthermore, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the combined focal length f23 of the second lens and the third lens, the spacing distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, and the spacing distance EP23 on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element satisfy: 1.80 <f23 / (EP12+EP23)<3.40。

[0013] Furthermore, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, and the inner diameter d1m of the image side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: -1.40 <d1m / R3+d2s / R4<0.40。

[0014] Furthermore, the spacer element group also includes a second spacer element placed between the second lens and the third lens and in contact with the image side surface of the second lens, and the maximum axial thickness CP2 of the second spacer element and the air gap T23 from the second lens to the third lens on the optical axis satisfy: 0.05≤CP2 / T23<0.25.

[0015] Furthermore, the spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and an outer diameter D5s of the object side surface of the fifth spacer element and an outer diameter D6s of the object side surface of the sixth spacer element satisfy the following relationship: 1.00 <D6s / D5s<1.15。

[0016] Further, the maximum axial height L of the lens barrel, the center thickness CT6 of the sixth lens, and the center thickness CT7 of the seventh lens satisfy: 3.40≤L / (CT6+CT7)<4.40.

[0017] Further, the spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and the combined focal length f56 of the fifth lens and the sixth lens, the inner diameter d5m of the image side surface of the fifth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 18.00 <f56 / (d6m-d5m)<31.60。

[0018] Furthermore, the spacer element group also includes a fourth spacer element placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens. The effective radius DT52 of the image side surface of the fifth lens, the effective radius DT51 of the object side surface of the fifth lens, and the spacing distance EP45 from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element on the optical axis satisfy the following: 3.45<(DT51+DT52) / EP45<7.00.

[0019] Furthermore, the spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and the inner diameter d6s of the object side surface of the sixth spacer element, the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R12 of the image side surface of the sixth lens satisfy: -5.85 <d6s / (R11+R12)≤1.55。

[0020] Further, the spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer element disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens, and an outer diameter D6m of the image side surface of the sixth spacer element and a spacing distance EP67 from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element on the optical axis satisfy the following conditions: 2.00 <D6m / EP67<2.55。

[0021] Furthermore, the effective focal length f7 of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D0m of the image side surface of the lens barrel and the inner diameter d0m of the image side surface of the lens barrel satisfy: .

[0022] By applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel, seven lenses arranged in the lens barrel, and a spacing element. The optical imaging lens of the present application is a lens with a large field of view, and the curvature radius of the object side and the image side of the first lens are greatly different. Affected by the surface shape of the first lens, the propagation path of the large-viewing angle light passing through the first lens becomes steeper. In addition, the surface shape of the first lens increases the air gap between the first lens and the second lens, thereby increasing the sensitivity of the optical imaging lens, which is prone to cause the problem of field curvature offset, resulting in poor imaging quality and poor stability of the optical imaging lens. Therefore, the present application uses the constraint of -2.40<(d0s-d1s) / (R2-R1)<0.20 to control the inner diameter of the lens barrel and the inner diameter of the object side of the first spacing element, so that the shape of the first lens matches the inner diameter of the lens barrel and the inner diameter of the object side of the first spacing element, which is beneficial to controlling the trend of the incident light through the first lens, avoiding the risk of a steep light propagation path, reducing the sensitivity of the optical imaging lens, and then avoiding the field curvature offset, thereby improving the imaging quality and resolution of the optical imaging lens, and at the same time ensuring that the optical imaging lens has good performance stability. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

[0025] Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1-1 of the present invention is shown;

[0026] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0027] Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiments 1 to 3 of the present invention is shown;

[0028] Figure 5 shows an axial chromatic aberration curve of the optical imaging lens according to the first embodiment of the present invention;

[0029] Figure 6 shows an astigmatism curve of the optical imaging lens according to the first embodiment of the present invention;

[0030] Figure 7 shows the distortion curve of the optical imaging lens according to the first embodiment of the present invention;

[0031] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 2-1 of the present invention is shown;

[0032] Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0033] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 2-3 of the present invention is shown;

[0034] Fig.11 shows an axial chromatic aberration curve of the optical imaging lens of the second embodiment of the present invention;

[0035] Fig.12 shows the astigmatism curve of the optical imaging lens of the second embodiment of the present invention;

[0036] Fig.13 shows the distortion curve of the optical imaging lens according to the second embodiment of the present invention;

[0037] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0038] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0039] Fig.16 A schematic structural diagram of an optical imaging lens according to Embodiment 3-3 of the present invention is shown;

[0040] Fig.17 shows an axial chromatic aberration curve of the optical imaging lens of the third embodiment of the present invention;

[0041] Fig.18 shows the astigmatism curve of the optical imaging lens of the third embodiment of the present invention;

[0042] Fig.19 shows the distortion curve of the optical imaging lens of the third embodiment of the present invention;

[0043] Fig. 20 The MTF defocus curve diagram of the optical imaging lens of Solution 1 of the present application is shown when Semi-FOV=61.100°, CT1 / (R2-R1)=0.02 and (d0s-d1s) / (R2-R1)=0.08;

[0044] Fig.21 The MTF defocus curve diagram of the optical imaging lens of Comparative Example 1 is shown when Semi-FOV=61.100°, CT1 / (R2-R1)=0.02 and (d0s-d1s) / (R2-R1)=1.42;

[0045] Fig. 22 The MTF defocus curve diagram of the optical imaging lens of Comparative Example 2 is shown when Semi-FOV=61.100°, CT1 / (R2-R1)=0.02 and (d0s-d1s) / (R2-R1)=-3.33.

[0046] The above drawings include the following reference numerals:

[0047] P0, lens barrel; E1, first lens; S1, object side surface of first lens; S2, image side surface of first lens; E2, second lens; S3, object side surface of second lens; S4, image side surface of second lens; E3, third lens; S5, object side surface of third lens; S6, image side surface of third lens; E4, fourth lens; S7, object side surface of fourth lens; S8, image side surface of fourth lens; E5, fifth lens; S9, object side surface of fifth lens; S10, image side surface of fifth lens; E6, sixth lens; S11, object side surface of sixth lens; S12, image side surface of sixth lens; E7, seventh lens; lens; S13, the object side surface of the seventh lens; S14, the image side surface of the seventh lens; P1, the first spacing element; P2, the second spacing element; P3, the third spacing element; P4, the fourth spacing element; P5, the fifth spacing element; P6, the sixth spacing element; P7, the seventh spacing element; P1b, the first auxiliary spacing element; P1c, the first auxiliary spacing element; P2b, the second auxiliary spacing element; P2c, the second auxiliary spacing element; P3b, the third auxiliary spacing element; P3c, the third auxiliary spacing element; P4b, the fourth auxiliary spacing element; P4c, the fourth auxiliary spacing element. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface type in the paraxial area can be based on the judgment method of 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 concave and convex. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0054] In this application, the object side refers to the side of the optical imaging lens facing the object to be photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging surface. In the following, the object side of the lens refers to the side surface of the lens facing the object to be photographed (not shown in the figure), and the image side of the lens refers to the side surface of the lens facing the imaging surface. In the structural schematic diagram shown in this application, the left side is the object side and the right side is the image side.

[0055] In order to solve the problem in the prior art that a seven-element optical imaging lens with a large field of view has a structure of a front lens that controls the light rays, thereby causing a steeper light trend and thus causing field curvature deviation, the present invention provides an optical imaging lens.

[0056] like Figures 1 to 20As shown, in an alternative embodiment of the present application, the optical imaging lens includes a lens barrel, a lens group, and a spacer element group disposed in the lens barrel. The lens group consists of seven lenses. The seven lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power. The image side surface of the first lens is concave. The object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave. The object side surface of the fifth lens is convex. The object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex. The object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave. There is an air gap between adjacent two of the first lens to the seventh lens.

[0057] The spacer element group includes a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens. The maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 54.95° < Semi-FOV ≤ 61.10°. The relationship among the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -0.45 < CT1 / (R2 - R1) < 0.05. The relationship among the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -2.40 < (d0s - d1s) / (R2 - R1) < 0.20.

[0058] The optical imaging lens of the present application consists of a lens barrel, seven lenses, and spacer elements disposed in the lens barrel. The optical imaging lens of the present application is a large field angle lens, and the curvature radius difference between the object side surface and the image side surface of the first lens is large. Affected by the surface shape of the first lens, the propagation path of large angle light passing through the first lens becomes relatively steep. In addition, the surface shape of the first lens will increase the air gap between the first lens and the second lens, increasing the sensitivity of the optical imaging lens and easily causing the problem of field curvature shift, resulting in poor imaging quality and poor stability of the optical imaging lens. Therefore, by restricting -2.40 < (d0s - d1s) / (R2 - R1) < 0.20, it is beneficial to control the inner diameter of the lens barrel and the inner diameter of the object side surface of the first spacer element, so that the shape of the first lens matches the inner diameter of the lens barrel and the inner diameter of the object side surface of the first spacer element, which is beneficial to controlling the trend of incident light passing through the first lens, avoiding the risk of steep light propagation path, reducing the sensitivity of the optical imaging lens, then avoiding the situation of field curvature shift, improving the imaging quality and resolution of the optical imaging lens, and at the same time ensuring that the optical imaging lens has good performance stability.

[0059] It should be noted that the central thickness CT1 of the first lens mentioned above specifically refers to the central thickness of the first lens on the optical axis. Similarly, the central thickness of the lens mentioned below specifically refers to the central thickness of the lens on the optical axis.

[0060] In addition, referring to Table 1 below, Figure 20 to Figure 22 as shown, on the premise that the optical imaging lens satisfies 54.95° < Semi-FOV ≤ 61.10° and -0.45 < CT1 / (R2 - R1) < 0.05, specifically, Semi-FOV = 61.100°, CT1 / (R2 - R1) = 0.02, Fig. 20 the MTF defocus curve graph when the optical imaging lens of Solution 1 of the present application satisfies (d0s - d1s) / (R2 - R1) = 0.08 is shown, Fig.21 the MTF defocus curve graph when the optical imaging lens of Comparative Example 1 satisfies (d0s - d1s) / (R2 - R1) = 1.42 is shown, Fig. 22 the MTF defocus curve graph when the optical imaging lens of Comparative Example 2 satisfies (d0s - d1s) / (R2 - R1) = -3.33 is shown. In Figure 20 to Figure 22 it, Field of View 1 is 0F, Field of View 2 is 0.5F, Field of View 3 is 0.8F, and Field of View 4 is 1F.

[0061] As Figure 20 to Figure 22 shown, when the optical imaging lens satisfies Semi-FOV = 61.100°, CT1 / (R2 - R1) = 0.02, and (d0s - d1s) / (R2 - R1) = 0.08, the field curvature is relatively concentrated, the peak value is high, and the overall performance stability is better, showing better performance. When the optical imaging lens satisfies Semi-FOV = 61.100°, CT1 / (R2 - R1) = 0.02, and (d0s - d1s) / (R2 - R1) = 1.42, the field curvature of the 0.8F and 1F fields of view shifts to the right and the peak value decreases, the field curvature shifts, and the performance stability is poor, showing poor performance. When the optical imaging lens satisfies Semi-FOV = 61.100°, CT1 / (R2 - R1) = 0.02, and (d0s - d1s) / (R2 - R1) = -3.33, the field curvature of the 0.8F and 1F fields of view shifts to the right and the peak value decreases, the field curvature shifts, and the performance stability is poor.

[0062] It can be seen that when Semi-FOV = 61.100°, CT1 / (R2 - R1) = 0.02, and (d0s - d1s) / (R2 - R1) is controlled within the range of -2.40 to 0.20, the field curvature concentration is the best, the peak value is higher, and the performance stability is the best; if (d0s - d1s) / (R2 - R1) is not within the range of this application, the path of the incident light will become steep, further resulting in an increase in the system sensitivity, serious field curvature deviation in some fields of view, and seriously affecting the performance concentration of the optical imaging lens. Therefore, by restricting 54.95° < Semi-FOV ≤ 61.10°, -0.45 < CT1 / (R2 - R1) < 0.05, and -2.40 < (d0s - d1s) / (R2 - R1) < 0.20, in the case of a large field of view lens, the bending degrees of the two surfaces of the first lens are reasonably controlled, so that the shape of the first lens matches the inner diameter of the lens barrel and the inner diameter of the object side surface of the first spacer element, which is beneficial to controlling the trend of the incident light passing through the first lens, avoiding the risk of a steep light propagation path, and at the same time being able to avoid the situation of field curvature deviation, reducing the sensitivity of the optical imaging lens, improving the imaging quality and resolution of the optical imaging lens, and at the same time ensuring that the optical imaging lens has good performance stability.

[0063] Table 1

[0064]

[0065] In this embodiment, the spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, a third spacer element disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer element disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens.

[0066] In this embodiment, the effective radius DT72 of the image side of the seventh lens, the effective radius DT11 of the object side of the first lens, the inner diameter d0m of the image side of the lens barrel, and the inner diameter d0s of the object side of the lens barrel satisfy: 4.05 < d0s / DT11 + d0m / DT72 < 5.90. By constraining the relationship between the effective radii of the image side of the seventh lens and the object side of the first lens, and the inner diameters of the image side and the object side of the lens barrel, it is beneficial to ensure that the effective light on the object side of the optical imaging lens can fully pass through the inner diameter of the lens barrel and then reach the imaging surface, which is conducive to presenting an image with higher clarity and resolution. If the inner diameter of the lens barrel is small, the effective light will be blocked by the edge of the lens barrel, resulting in lower imaging brightness and poorer quality.

[0067] It should be noted that the effective light refers to those lights that can be accurately focused on the imaging surface directly or after internal refraction by the optical imaging lens. These lights follow the optical laws, such as the refraction law and the reflection law, when passing through the optical imaging lens, and finally form a clear image on the imaging surface.

[0068] In this embodiment, the effective focal length f1 of the first lens and the inner diameter d1s of the object side of the first spacer element satisfy: -3.00 < f1 / d1s < -2.65. By constraining the relationship between the effective focal length of the first lens and the inner diameter of the object side of the first spacer element, it helps to control the light propagation path and the light flux size of the light in the first lens, is beneficial to avoid the situation where the light trend is steep, is beneficial to reducing aberration, and thus comprehensively improves the imaging performance of the optical imaging lens.

[0069] In this embodiment, the maximum axial height L of the lens barrel, the axial spacing distance EP01 from the object side of the lens barrel to the object side of the first spacer element, and the axial spacing distance EP12 from the image side of the first spacer element to the object side of the second spacer element satisfy: 2.45 < L / (EP01 + EP12) ≤ 3.30. By constraining the relationship between the maximum axial height of the lens barrel, the axial spacing distance from the object side of the lens barrel to the object side of the first spacer element, and the axial spacing distance from the image side of the first spacer element to the object side of the second spacer element, it helps to control the size of the entire optical imaging lens, indirectly controls the overall optical length, makes its size reasonable for easy installation and adjustment, and can be better applied to portable wearable devices at the same time.

[0070] Here it should be noted that the maximum axial height L of the lens barrel is specifically the axial spacing distance from the object side of the lens barrel to the image side of the lens barrel.

[0071] In this embodiment, the combined focal length f23 of the second lens and the third lens, the distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, and the distance EP23 on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element satisfy: 1.80 < f23 / (EP12 + EP23) < 3.40. By restricting the relationship between the combined focal length of the second lens and the third lens, the distance on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, and the distance on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, it helps to rationally arrange the effective focal lengths of the second and third lenses, effectively reduce the generation of aberrations. At the same time, by controlling the distances between the first spacer element, the second spacer element, and the third spacer element, the risk of assembly interference between the second lens and the third lens can be significantly reduced, further improving the reliability of the optical imaging lens.

[0072] In this embodiment, the inner diameter d1m of the image side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: -1.40 < d1m / R3 + d2s / R4 < 0.40. By restricting the inner diameter of the image side surface of the first spacer element, the inner diameter of the object side surface of the second spacer element, and the curvature radii of the object side surface and the image side surface of the second lens, it is beneficial to control the propagation path of light in the optical imaging lens, enabling the effective light to reach the imaging surface smoothly and reducing noise such as stray light.

[0073] In this embodiment, the maximum axial thickness CP2 of the second spacer element and the air gap T23 on the optical axis from the second lens to the third lens satisfy: 0.05 ≤ CP2 / T23 < 0.25. By restricting the proportional relationship between the maximum axial thickness of the second spacer element and the air gap between the second and third lenses, it is beneficial for the center effective diameter part of the image side surface of the second lens and the object side surface of the third lens to have as small a distance as possible from the edge flange mechanism on the optical axis, avoiding the risk of difficult forming and demolding of the second lens and the third lens due to too large an axial distance at these two places.

[0074] In this embodiment, the outer diameter D5s of the object side surface of the fifth spacer element and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: 1.00 < D6s / D5s < 1.15. By restricting the proportional relationship between the outer diameters of the object side surfaces of the fifth spacer element and the sixth spacer element, it helps to control the uniform transition of the outer contour on the image side of the lens barrel, ensure consistent shrinkage during the molding of the lens barrel, and ensure the relevant dimensions and appearance.

[0075] In this embodiment, the maximum axial height L of the lens barrel, the central thickness CT6 of the sixth lens, and the central thickness CT7 of the seventh lens satisfy: 3.40 ≤ L / (CT6 + CT7) < 4.40. Constraining this conditional expression helps prevent the image side of the seventh lens from protruding beyond the image side of the lens barrel and, at the same time, avoids the risk of interference between the object side of the seventh lens and the image side of the sixth lens during assembly.

[0076] In this embodiment, the combined focal length f56 of the fifth lens and the sixth lens, the inner diameter d5m of the image side of the fifth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy: 18.00 < f56 / (d6m - d5m) < 31.60. By constraining the relationship between the combined focal length of the fifth lens and the sixth lens, the inner diameter of the image side of the fifth spacer element, and the inner diameter of the image side of the sixth spacer element, it helps control the propagation path of light inside the lens barrel. The inner diameters of the fifth spacer element and the sixth spacer element can effectively intercept excess non-effective light, playing a role in improving stray light. At the same time, it helps arrange the effective focal lengths of the fifth lens and the sixth lens reasonably, resulting in higher and better imaging quality.

[0077] It should be noted that non-effective light refers to those lights that do not participate in the imaging process. This includes lights that enter the optical imaging lens but do not focus on the imaging surface, or lights that are scattered, reflected, or absorbed inside the optical imaging lens. Non-effective light can be caused by physical limitations of the design or by factors such as unevenness, dust, scratches, or uneven coating on the surface of the lens. In this embodiment, the effective radius DT52 of the image side of the fifth lens, the effective radius DT51 of the object side of the fifth lens, and the distance EP45 on the optical axis from the image side of the fourth spacer element to the object side of the fifth spacer element satisfy: 3.45 < (DT51 + DT52) / EP45 < 7.00. By constraining the relationship between the effective radii of the object side and the image side of the fifth lens and the distance between the fourth spacer element and the fifth spacer element, it helps avoid a too large difference between the central thickness and the edge thickness of the fifth lens, thereby reducing the risk of uncontrollable surface shape during the molding and demolding of the fifth lens.

[0078] In this embodiment, the inner diameter d6s of the object side of the sixth spacer element, the curvature radius R11 of the object side of the sixth lens, and the curvature radius R12 of the image side of the sixth lens satisfy: -5.85 < d6s / (R11 + R12) ≤ 1.55. By constraining the relationship between the inner diameter of the object side of the sixth spacer element, the curvature radii of the object side and the image side of the sixth lens, it helps control the propagation path of the imaging light. At the same time, it helps the sixth spacer element intercept non-effective light, avoid the transmission of stray light to the rear, and thus reduce imaging noise and improve the clarity and resolution of the imaging.

[0079] In this embodiment, the outer diameter D6m of the image side surface of the sixth spacer element and the axial distance EP67 on the optical axis from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element satisfy: 2.00 < D6m / EP67 < 2.55. By restricting the relationship between the outer diameter of the image side surface of the sixth spacer element and the axial distance on the optical axis from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element, it is beneficial to the reasonable arrangement of each structure in the lens barrel, leaving room for optimizing and improving the subsequent imaging performance and yield.

[0080] In this embodiment, the effective focal length f7 of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D0m of the image side surface of the lens barrel, and the inner diameter d0m of the image side surface of the lens barrel satisfy: . By restricting the relationship between the effective focal length and refractive index of the seventh lens and the outer diameter and inner diameter of the image side surface of the lens barrel, it is beneficial to ensure that the imaging light can fully reach the imaging surface, guarantee high-quality imaging, and at the same time ensure a certain thickness at the image side end of the lens barrel to ensure the structural strength of the image side end of the lens barrel.

[0081] Optionally, the optical imaging lens in the embodiment of the present application can be simulated or modeled by software and / or tools such as LIGHTOOS, ASAP, ZEMAX, CODEV, etc. During the simulation process using the above software and / or tools, the surface profiles of each lens can be appropriately adjusted according to the built-in surface profiles of the software and / or tools used.

[0082] In addition, in another optional embodiment of the present application, an optical imaging lens is further provided, which includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of seven lenses. The seven lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with a positive optical power, a fifth lens with an optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power; the image side surface of the first lens is concave; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave; there is an air gap between adjacent two of the first lens to the seventh lens.

[0083] The spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface of the first lens, a second spacer element placed between the second lens and the third lens and in contact with the image side surface of the second lens, a fifth spacer element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element placed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens; the maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 54.95° < Semi-FOV ≤ 61.10°; between the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens, it satisfies: -0.45 < CT1 / (R2 - R1) < 0.05; between the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element, it satisfies: -3.00 < f1 / d1s < -2.65.

[0084] The optical imaging lens of the present application is composed of a lens barrel and seven lenses and spacer elements arranged in the lens barrel. The optical imaging lens of the present application is a large field-of-view lens, and the curvature radius difference between the object side surface and the image side surface of the first lens is large. Affected by the surface shape of the first lens, the propagation path of large-angle light passing through the first lens becomes relatively steep. In addition, the surface shape of the first lens will increase the air gap between the first lens and the second lens, increasing the sensitivity of the optical imaging lens and easily causing the problem of field curvature deviation, resulting in poor imaging quality and poor stability of the optical imaging lens. Therefore, by restricting -3.00 < f1 / d1s < -2.65, it helps to control the light propagation path and the magnitude of the light flux in the first lens, is beneficial to avoiding the steep situation of the light trend, is beneficial to reducing aberration, reducing the sensitivity of the optical imaging lens, improving the imaging quality and resolution of the optical imaging lens, and at the same time ensuring that the optical imaging lens has good performance stability.

[0085] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0086] In addition, in another alternative embodiment of the present application, an optical imaging lens is further provided, which includes a lens barrel and a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of seven lenses. The seven lenses are, in order from the object side to the image side along the optical axis of the optical imaging lens, a first lens with a negative focal power, a second lens with a focal power, a third lens with a positive focal power, a fourth lens with a positive focal power, a fifth lens with a focal power, a sixth lens with a positive focal power, and a seventh lens with a negative focal power; the image side surface of the first lens is concave; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave; there is an air gap between every two adjacent lenses among the first lens to the seventh lens; the spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface of the first lens; the maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 54.95° < Semi-FOV ≤ 61.10°; the relationship among the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -0.45 < CT1 / (R2 - R1) < 0.05; the relationship between the inner diameter d1s of the object side surface of the first spacer element and the curvature radius R2 of the image side surface of the first lens satisfies: 0.45 < d1s / R2 < 0.70.

[0087] The optical imaging lens of the present application is composed of a lens barrel and seven lenses and multiple spacer elements arranged in the lens barrel. The optical imaging lens of the present application is a large field angle lens, and the difference in the curvature radii of the object side surface and the image side surface of the first lens is relatively large. Affected by the surface shape of the first lens, the propagation path of large-angle light passing through the first lens becomes relatively steep. In addition, the surface shape of the first lens will increase the air gap between the first lens and the second lens, increasing the sensitivity of the optical imaging lens and easily causing the problem of field curvature deviation, resulting in poor imaging quality and poor stability of the optical imaging lens. Therefore, by restricting 0.45 < d1s / R2 < 0.70, it is beneficial to reasonably control the ratio of the inner diameter of the object side surface of a spacer element to the curvature radius of the image side surface of the first lens, thereby ensuring the improvement of the surface shape and shape rationality of the first lens. At the same time, it is beneficial to ensure the matching of the shape of the first lens and the first spacer element, which is beneficial to controlling the trend of incident light passing through the first lens, avoiding the risk of a steep light propagation path, and then avoiding the situation of field curvature deviation, improving the imaging quality and resolution of the optical imaging lens, and at the same time ensuring that the optical imaging lens has good performance stability.

[0088] In this embodiment, other parametric formulas in the above embodiment may also be included, which will not be elaborated here one by one.

[0089] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0090] The optical imaging lens in the present application may use multiple lenses, such as the seven lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0091] 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.

[0092] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown. Figure 1 Parameters such as d0s, D6s, d6s, D5s, d2s, d1s, d1m, d5m, d6m, D6m, d0m, D0m, CP2, EP01, EP12, EP23, EP45, EP67, and L are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0093] 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.

[0094] It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3, in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3, and in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3. The parameters such as the radius of curvature, center thickness, and spacing distances between lenses and high-order coefficients of the optical imaging lens in the three examples of the same embodiment are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element to the seventh spacing element are different.

[0095] It should be noted that any one of the following examples 1 to 3 is applicable to all implementation methods of the present application.

[0096] Embodiment 1

[0097] like Figures 2 to 7 As shown, the optical imaging lens of the first embodiment is described. Figure 2 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-2 is shown, Figure 4 The schematic diagram of the structure of the optical imaging lens of Embodiment 1-3 is shown.

[0098] like Figures 2 to 4 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, and a seventh spacing element P7, which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0099] like Figure 2 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the object side surface and image side surface of the first spacer element P1 are in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and image side surface of the second spacer element P2 are in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element P3 are in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and image side surface of the fourth spacer element P4 are in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and image side surface of the fifth spacer element P5 are in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively. The object side surface and image side surface of the sixth spacer element P6 are in contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively. The object side surface of the seventh spacer element P7 is in contact with the image side surface S14 of the seventh lens.

[0100] like Figure 3 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-2. The difference between this example and Example 1-1 is that a fourth auxiliary spacer element P4b is further provided on the image side of the fourth spacer element P4. At this time, the object side surface and the image side surface of the fourth auxiliary spacer element P4b are in contact with the image side surface of the fourth spacer element P4 and the object side surface S9 of the fifth lens, respectively. The contact method of the remaining spacer elements is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and no further description is given here.

[0101] like Figure 4 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-3. The difference between this example and Example 1-2 is that a second auxiliary spacer element P2b is further provided on the image side of the second spacer element P2, and at this time, the object side surface and the image side surface of the second auxiliary spacer element P2b are in contact with the image side surface of the second spacer element P2 and the object side surface S5 of the third lens, respectively. The contact mode of the remaining spacer elements is the same as that of Example 1-2, and the relevant description in Example 1-2 may be referred to, and no further description is given here.

[0102] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 2 (unit: mm).

[0103] Table 2

[0104]

[0105] In Embodiment 1, the first lens E1 has negative power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex. The seventh lens E7 has negative power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave.

[0106] In Embodiment 1, the maximum half field of view angle Semi-FOV of the optical imaging lens is 54.990°, the effective focal length f of the optical imaging lens is 3.184 mm, the effective focal length f1 of the first lens is -4.778 mm, the effective focal length f2 of the second lens is -53.148 mm, the effective focal length f3 of the third lens is 6.188 mm, the effective focal length f4 of the fourth lens is 23.537 mm, the effective focal length f5 of the fifth lens is 100.091 mm, the effective focal length f6 of the sixth lens is 2.817 mm, the effective focal length f7 of the seventh lens is -3.177 mm, the combined focal length f23 of the second lens and the third lens is 6.991 mm, and the combined focal length f56 of the fifth lens and the sixth lens is 2.941 mm.

[0107] Table 3 shows the basic structural parameter table of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all in millimeters (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture, which is located between the second lens E2 and the third lens E3. S15 and S16 (not shown in the figure) can be the object side and image side of the filter or the object side and image side of the protective glass. S17 (not shown in the figure) is the imaging surface.

[0108] Table 3

[0109]

[0110] In Embodiment 1, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 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:

[0111] Formula (1).

[0112] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 3; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S14 in Example 1.

[0113] Table 4

[0114]

[0115] Figure 5 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 6 The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different half field angles.

[0116] according to Figures 5 to 7 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0117] Embodiment 2

[0118] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-1. Fig. 9 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-2. Fig.10 A schematic structural diagram of the optical imaging lens of Example 2-3 is shown.

[0119] like Figures 8 to 10 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, and a seventh spacing element P7, which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0120] like Figure 8 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, the object side surface and image side surface of the first spacer element P1 are in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and image side surface of the second spacer element P2 are in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element P3 are in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and image side surface of the fourth spacer element P4 are in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and image side surface of the fifth spacer element P5 are in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively. The object side surface and image side surface of the sixth spacer element P6 are in contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively. The object side surface of the seventh spacer element P7 is in contact with the image side surface S14 of the seventh lens.

[0121] like Fig. 9 As shown, it is a schematic diagram of the structure of the optical imaging lens of Example 2-2. The difference between this example and Example 2-1 is that the image side of the first spacer element P1 is also sequentially provided with the first auxiliary spacer element P1b and the first auxiliary spacer element P1c, and the image side of the fourth spacer element P4 is also sequentially provided with the fourth auxiliary spacer element P4b and the fourth auxiliary spacer element P4c. At this time, the object side surface and the image side surface of the first auxiliary spacer element P1b are in contact with the image side surface of the first spacer element P1 and the object side surface of the first auxiliary spacer element P1c, respectively, and the image side surface of the first auxiliary spacer element P1c is in contact with the object side surface S3 of the second lens. The object side surface and the image side surface of the fourth auxiliary spacer element P4b are in contact with the image side surface of the fourth spacer element P4 and the object side surface of the fourth auxiliary spacer element P4c, respectively, and the image side surface of the fourth auxiliary spacer element P4c is in contact with the object side surface S9 of the fifth lens. The contact mode of the remaining spacers is the same as that of Example 2-1, and the relevant description in Example 2-1 can be referred to, and it will not be repeated here.

[0122] like Fig.10 As shown, it is a schematic diagram of the structure of the optical imaging lens of Example 2-3. The difference between this example and Example 2-2 is that the first auxiliary spacer element P1c is not set, and the third auxiliary spacer element P3b is set on the image side of the third spacer element P3. At this time, the object side surface and image side surface of the first auxiliary spacer element P1b are in contact with the image side surface of the first spacer element P1 and the object side surface S3 of the second lens respectively. The object side surface and image side surface of the third auxiliary spacer element P3b are in contact with the image side surface of the third spacer element P3 and the object side surface S7 of the fourth lens respectively. The contact method of the remaining spacer elements is the same as that of Example 2-2, and the relevant description in Example 2-2 can be referred to, which will not be repeated here.

[0123] In summary, the structural parameters of the optical imaging lens of Example 2 in Example 2-1, Example 2-2, and Example 2-3 are shown in Table 5 (unit: mm).

[0124] Table 5

[0125]

[0126] In the second embodiment, the first lens E1 has negative power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is concave. The second lens E2 has negative power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has negative power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex. The seventh lens E7 has negative power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave.

[0127] In Example 2, the maximum half field of view Semi-FOV of the optical imaging lens is 61.100°, the effective focal length f of the optical imaging lens is 3.277 mm, the effective focal length f1 of the first lens is -4.773 mm, the effective focal length f2 of the second lens is -86.009 mm, the effective focal length f3 of the third lens is 4.784 mm, the effective focal length f4 of the fourth lens is 12.576 mm, the effective focal length f5 of the fifth lens is -100.458 mm, the effective focal length f6 of the sixth lens is 4.256 mm, the effective focal length f7 of the seventh lens is -3.891 mm, the combined focal length f23 of the second lens and the third lens is 5.297 mm, and the combined focal length f56 of the fifth lens and the sixth lens is 4.689 mm.

[0128] Table 6 shows the basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all in millimeters (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture, which is located between the second lens E2 and the third lens E3. S15 and S16 (not shown in the figure) can be the object side and image side of the filter or the object side and image side of the protective glass. S17 (not shown in the figure) is the imaging surface.

[0129] Table 6

[0130]

[0131] Table 7 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric surface S1-S14 in Example 2.

[0132] Table 7

[0133]

[0134] Fig.11 The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig.12 The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.13 The distortion curve of the optical imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different half field angles.

[0135] according to Figures 11 to 13 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0136] Embodiment 3

[0137] like Figures 14 to 19As shown, the optical imaging lens of embodiment 3 is described. Fig.14 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.15 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-2. Fig.16 A schematic structural diagram of the optical imaging lens of Example 3-3 is shown.

[0138] like Figures 14 to 16 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a seventh lens E7, and a seventh spacing element P7, which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0139] like Fig.14 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, the object side surface and image side surface of the first spacer element P1 are in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and image side surface of the second spacer element P2 are in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element P3 are in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and image side surface of the fourth spacer element P4 are in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and image side surface of the fifth spacer element P5 are in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively. The object side surface and image side surface of the sixth spacer element P6 are in contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively. The object side surface of the seventh spacer element P7 is in contact with the image side surface S14 of the seventh lens.

[0140] like Fig.15As shown, it is a schematic diagram of the structure of the optical imaging lens of Example 3-2. The difference between this example and Example 3-1 is that the image side of the second spacer element P2 is also sequentially provided with a second auxiliary spacer element P2b and a second auxiliary spacer element P2c, and the image side of the third spacer element P3 is also sequentially provided with a third auxiliary spacer element P3b and a third auxiliary spacer element P3c. At this time, the object side surface and the image side surface of the second auxiliary spacer element P2b are in contact with the image side surface of the second spacer element P2 and the second auxiliary spacer element P2c, respectively, and the image side surface of the second auxiliary spacer element P2c is in contact with the object side surface S5 of the third lens. The object side surface and the image side surface of the third auxiliary spacer element P3b are in contact with the image side surface of the third spacer element P3 and the object side surface of the third auxiliary spacer element P3c, respectively, and the image side surface of the third auxiliary spacer element P3c is in contact with the object side surface S7 of the fourth lens. The contact mode of the remaining spacers is the same as that of Example 3-1, and the relevant description in Example 3-1 can be referred to, and it will not be repeated here.

[0141] like Fig.16 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-3. In this example, the contact method of each spacer element is the same as that of Example 3-2, and the relevant description in Example 3-2 may be referred to, and will not be repeated here.

[0142] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1, Example 3-2, and Example 3-3 are shown in Table 8 (unit: mm).

[0143] Table 8

[0144]

[0145] In the third embodiment, the first lens E1 has negative focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has positive focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has positive focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave.

[0146] In Example 3, the maximum half field of view Semi-FOV of the optical imaging lens is 61.100°, the effective focal length f of the optical imaging lens is 3.061 mm, the effective focal length f1 of the first lens is -4.887 mm, the effective focal length f2 of the second lens is 7.456 mm, the effective focal length f3 of the third lens is 27.428 mm, the effective focal length f4 of the fourth lens is 32.063 mm, the effective focal length f5 of the fifth lens is 12.351 mm, the effective focal length f6 of the sixth lens is 3.401 mm, the effective focal length f7 of the seventh lens is -3.822 mm, the combined focal length f23 of the second lens and the third lens is 6.298 mm, and the combined focal length f56 of the fifth lens and the sixth lens is 2.840 mm.

[0147] Table 9 shows the basic structural parameter table of the optical imaging lens of Example 3, where the units of the radius of curvature and thickness / distance are all in millimeters. In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture, which is located between the second lens E2 and the third lens E3. S15 and S16 (not shown in the figure) can be the object side and image side of the filter or the object side and image side of the protective glass. S17 (not shown in the figure) is the imaging surface.

[0148] Table 9

[0149]

[0150] Table 10 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric surface S1-S14 in Example 3.

[0151] Table 10

[0152]

[0153] Fig.17 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig.18 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.19 The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different half field angles.

[0154] according to Figures 17 to 19 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0155] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship shown in Table 11.

[0156] Table 11

[0157]

[0158] Table 12 shows the effective focal length of the optical imaging lens of Examples 1 to 3 and parameters such as the effective focal length of each lens.

[0159] Table 12

[0160]

[0161] 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.

[0162] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0163] 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.

[0164] 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.

[0165] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: It includes a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group consists of seven lenses. Along the optical axis of the optical imaging lens from the object side to the image side, the seven lenses are, in sequence, a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power; the image side surface of the first lens is concave; the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave; the object side surface of the fifth lens is convex; the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex; the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave; there is an air gap between adjacent two of the first lens to the seventh lens. The spacer element group includes a first spacer element placed between the first lens and the second lens and in contact with the image side surface of the first lens. The maximum semi-field angle Semi-FOV of the optical imaging lens satisfies: 54.95° < Semi-FOV ≤ 61.10°; the relationship among the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -0.45 < CT1 / (R2 - R1) < 0.05; the relationship among the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfies: -2.40 < (d0s - d1s) / (R2 - R1) < 0.

20.

2. The optical imaging lens according to claim 1, wherein: The relationship among the effective radius DT72 of the image side surface of the seventh lens, the effective radius DT11 of the object side surface of the first lens, the inner diameter d0m of the image side surface of the lens barrel, and the inner diameter d0s of the object side surface of the lens barrel satisfies: 4.05 < d0s / DT11 + d0m / DT72 < 5.

90.

3. The optical imaging lens according to claim 1, wherein: The relationship between the effective focal length f1 of the first lens and the inner diameter d1s of the object side surface of the first spacer element satisfies: -3.00 < f1 / d1s < -2.

65.

4. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a second spacer element placed between the second lens and the third lens and in contact with the image side surface of the second lens. The relationship among the maximum axial height L of the lens barrel, the spacing distance EP01 on the optical axis from the object side surface of the lens barrel to the object side surface of the first spacer element, and the spacing distance EP12 on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element satisfies: 2.45 < L / (EP01 + EP12) ≤ 3.

30.

5. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a second spacer element placed between the second lens and the third lens and in contact with the image side surface of the second lens, and a third spacer element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens. The combined focal length f23 of the second lens and the third lens, the spacing distance EP12 from the image side surface of the first spacing element to the object side surface of the second spacing element on the optical axis, and the spacing distance EP23 from the image side surface of the second spacing element to the object side surface of the third spacing element on the optical axis satisfy: 1.80 <f23 / (EP12+EP23)<3.40。 6. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a second spacer element disposed between the second lens and the third lens and in contact with the image side surface of the second lens, wherein an inner diameter d1m of the image side surface of the first spacer element, an inner diameter d2s of the object side surface of the second spacer element, a curvature radius R3 of the object side surface of the second lens, and a curvature radius R4 of the image side surface of the second lens satisfy: -1.40 <d1m / R3+d2s / R4<0.40。 7. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a second spacer element placed between the second lens and the third lens and in contact with the image side surface of the second lens, and the maximum axial thickness CP2 of the second spacer element and the air gap T23 from the second lens to the third lens on the optical axis satisfy: 0.05≤CP2 / T23<0.

25.

8. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, wherein an outer diameter D5s of the object side surface of the fifth spacer element and an outer diameter D6s of the object side surface of the sixth spacer element satisfy the following relationship: 1.00 <D6s / D5s<1.15。 9. The optical imaging lens according to claim 1, wherein: The maximum axial height L of the lens barrel, the center thickness CT6 of the sixth lens, and the center thickness CT7 of the seventh lens satisfy the following: 3.40≤L / (CT6+CT7)<4.

40.

10. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens. The combined focal length f56 of the fifth lens and the sixth lens, the inner diameter d5m of the image side surface of the fifth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy the following relationship: 18.00 <f56 / (d6m-d5m)<31.60。 11. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens. The effective radius DT52 of the image side surface of the fifth lens, the effective radius DT51 of the object side surface of the fifth lens, and the spacing distance EP45 from the image side surface of the fourth spacing element to the object side surface of the fifth spacing element on the optical axis satisfy the following: 3.45<(DT51+DT52) / EP45<7.

00.

12. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, wherein an inner diameter d6s of the object side surface of the sixth spacer element, a curvature radius R11 of the object side surface of the sixth lens, and a curvature radius R12 of the image side surface of the sixth lens satisfy the following relationship: -5.85 <d6s / (R11+R12)≤1.55。 13. The optical imaging lens according to claim 1, wherein: The spacer element group further includes a sixth spacer element disposed between the sixth lens and the seventh lens and in contact with the image side surface of the sixth lens, and a seventh spacer element disposed on the image side of the seventh lens and in contact with the image side surface of the seventh lens. The outer diameter D6m of the image side surface of the sixth spacer element and the spacing distance EP67 from the image side surface of the sixth spacer element to the object side surface of the seventh spacer element on the optical axis satisfy: 2.00 <D6m / EP67<2.55。 14. The optical imaging lens according to claim 1, wherein: The effective focal length f7 of the seventh lens, the refractive index N7 of the seventh lens, the outer diameter D0m of the image side surface of the lens barrel and the inner diameter d0m of the image side surface of the lens barrel satisfy: .

Images