Optical imaging lens

Abstract

The present invention provides an optical imaging lens. The optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group consists of seven lenses. The seven lenses are, in sequence, 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; satisfying: 54.95° < Semi-FOV ≤ 61.10°; satisfying: -0.45 < CT1 / (R2 - R1) < 0.05; satisfying: -2.40 < (d0s - d1s) / (R2 - R1) < 0.20. The present invention solves the problem that in the prior art, for a seven-piece optical imaging lens with a large field angle, by controlling the structure of the front-end lens, the light path is relatively steep, thereby causing field curvature deviation.

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, particularly in mobile electronic devices, security surveillance, and vehicle cameras. However, evolving market demands are placing increasing demands on the field of view of optical imaging lenses, along with new requirements for image clarity and resolution.

[0003] Currently, existing seven-element optical imaging lenses with a large field of view control the structure of the front lens, such as the size and surface shape of the front lens. However, due to the influence of the front lens surface shape, the incident light path through the front lens is easily steeper, which can easily cause field curvature offset, increase the sensitivity of the optical imaging lens, and seriously affect the stability of the overall performance.

[0004] That is to say, the existing seven-element optical imaging lens with a large field of view has a problem of field curvature offset caused by controlling the structure of the front lens, which causes the light to travel steeply. Summary of the Invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem of field curvature deviation caused by the control of the structure of the front lens in the existing seven-element 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 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 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 from 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 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 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 from 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 contacting 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 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, there is also provided an optical imaging lens, including a lens barrel and 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 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; the spacer element group includes a first spacer element disposed between the first lens and the second lens and contacting 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 center 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 contacting 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, wherein 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 the following conditions: 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, wherein 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 the following relationship: -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 on the optical axis from the second lens to the third lens 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, 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。

[0016] Furthermore, 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 relationship: 3.40≤L / (CT6+CT7)<4.40.

[0017] 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. 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。

[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, wherein 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 the following relationship: -5.85 <d6s / (R11+R12)≤1.55。

[0020] 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 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, wherein an outer diameter D6m of the image side surface of the sixth spacer element and a spacing 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 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 the following relationship: .

[0022] Applying the technical solution of the present invention, the optical imaging lens of the present application comprises a lens barrel, seven lenses disposed within the barrel, and a spacer element. The optical imaging lens of the present application has a wide field of view, and the curvature radii of the object-side and image-side surfaces of the first lens differ significantly. Due to the surface shape of the first lens, the propagation path of light rays passing through the first lens at wide viewing angles becomes steeper. Furthermore, the surface shape of the first lens increases the air gap between the first and second lenses, increasing the sensitivity of the optical imaging lens and easily causing field curvature offset, resulting in poor imaging quality and stability of the optical imaging lens. Therefore, the present application utilizes the constraint of -2.40<(d0s-d1s) / (R2-R1)<0.20 to facilitate control of the inner diameter of the lens barrel and the inner diameter of the object side surface of the first spacer element, thereby matching the shape of the first lens with the inner diameters of the lens barrel and the object side surface of the first spacer element. This facilitates control of the path of incident light through the first lens, avoids the risk of a steep light propagation path, reduces the sensitivity of the optical imaging lens, and thereby avoids field curvature offset, thereby improving the imaging quality and resolution of the optical imaging lens, while also ensuring that the optical imaging lens has good performance stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

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

[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 Schematic diagrams showing the structures of optical imaging lenses according to embodiments 1-3 of the present invention are 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 the 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 2. A schematic structural diagram of an optical imaging lens according to embodiment 2-1 of the present invention is shown;

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

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

[0034] Figure 11 shows an on-axis chromatic aberration curve of the optical imaging lens according to the second embodiment of the present invention;

[0035] Figure 12 shows the astigmatism curve of the optical imaging lens according to the second embodiment of the present invention;

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

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

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

[0039] Figure 16 Schematic diagram of the structure of the optical imaging lens of Example 3-3 of the present invention is shown;

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

[0041] Figure 18 shows the astigmatism curve of the optical imaging lens according to the third embodiment of the present invention;

[0042] Figure 19 shows the distortion curve of the optical imaging lens according to the third embodiment of the present invention;

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

[0044] Figure 21 The MTF defocus curve 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] Figure 22 The MTF defocus curve 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 the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; E7, seventh lens lens; S13, object-side surface of the seventh lens; S14, image-side surface of the seventh lens; P1, first spacer; P2, second spacer; P3, third spacer; P4, fourth spacer; P5, fifth spacer; P6, sixth spacer; P7, seventh spacer; P1b, first auxiliary spacer; P1c, first auxiliary spacer; P2b, second auxiliary spacer; P2c, second auxiliary spacer; P3b, third auxiliary spacer; P3c, third auxiliary spacer; P4b, fourth auxiliary spacer; P4c, fourth auxiliary spacer. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this 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 meaning 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 direction; 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 directional words are not used to limit the present invention.

[0051] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0052] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0053] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it indicates that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it indicates that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those skilled in the art, using the positive or negative R value (R refers to the radius of curvature of the paraxial region, typically the R value in the lens database in optical software) to determine whether it is convex or concave. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface. For the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0054] In this application, the object side refers to the side of an optical imaging lens facing the object (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging plane. Hereinafter, the object-side surface of a lens refers to the side of the lens facing the object (not shown in the figure), and the image-side surface of a lens refers to the side of the lens facing the imaging plane. In the schematic diagrams 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 of seven-element optical imaging lenses with a large field of view, in which the structure of the front lens is controlled, resulting in a steeper light path and thus causing field curvature deviation, the present invention provides an optical imaging lens.

[0056] like Figures 1 to 20As shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group 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 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.

[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 and 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 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 the 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, resulting in an increase in the sensitivity of the optical imaging lens, which is likely to cause 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 the incident light passing 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 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, Figures 20 to 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, Figure 20 shows the MTF defocus curve diagram when the optical imaging lens of Solution 1 of the present application satisfies (d0s - d1s) / (R2 - R1) = 0.08, Figure 21 shows the MTF defocus curve diagram when the optical imaging lens of Comparative Example 1 satisfies (d0s - d1s) / (R2 - R1) = 1.42, Figure 22 shows the MTF defocus curve diagram when the optical imaging lens of Comparative Example 2 satisfies (d0s - d1s) / (R2 - R1) = -3.33. In Figures 20 to 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 Figures 20 to 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 relatively high, the overall performance stability is relatively good, and the performance is relatively good. 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 relatively poor, and the performance is relatively poor. 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 relatively 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, this application restricts 54.95° < Semi-FOV ≤ 61.10°, -0.45 < CT1 / (R2 - R1) < 0.05, and -2.40 < (d0s - d1s) / (R2 - R1) < 0.20. Under the 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 placed between the second lens and the third lens and contacting the image side surface of the second lens, a third spacer element placed between the third lens and the fourth lens and contacting the image side surface of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and contacting the image side surface of the fourth lens, a fifth spacer element placed between the fifth lens and the sixth lens and contacting the image side surface of the fifth lens, a sixth spacer element placed between the sixth lens and the seventh lens and contacting the image side surface of the sixth lens, and a seventh spacer element placed on the image side of the seventh lens and contacting 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 restricting 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 restricting 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 magnitude of the light flux in the first lens, is beneficial to avoid the situation of steep light trend, 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 distance EP01 between the object side of the lens barrel and the object side of the first spacer element on the optical axis, and the axial distance EP12 between the image side of the first spacer element and the object side of the second spacer element on the optical axis satisfy: 2.45 < L / (EP01 + EP12) ≤ 3.30. By restricting the relationship between the maximum axial height of the lens barrel, the axial distance between the object side of the lens barrel and the object side of the first spacer element on the optical axis, and the axial distance between the image side of the first spacer element and the object side of the second spacer element on the optical axis, 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 distance between the object side of the lens barrel and the image side of the lens barrel on the optical axis.

[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 of the first spacer element to the object side of the second spacer element, and the distance EP23 on the optical axis from the image side of the second spacer element to the object side of the third spacer element satisfy: 1.80 < f23 / (EP12 + EP23) < 3.40. By constraining 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 of the first spacer element to the object side of the second spacer element, and the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element, it helps to reasonably 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, and the reliability of the optical imaging lens can be further improved.

[0072] In this embodiment, the inner diameter d1m of the image side of the first spacer element, the inner diameter d2s of the object side of the second spacer element, the curvature radius R3 of the object side of the second lens, and the curvature radius R4 of the image side of the second lens satisfy: -1.40 < d1m / R3 + d2s / R4 < 0.40. By constraining the inner diameter of the image side of the first spacer element, the inner diameter of the object side of the second spacer element, the curvature radii of the object side and the image side of the second lens, it is beneficial to control the propagation path of light in the optical imaging lens, enable the effective light to reach the imaging surface smoothly, and reduce 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 constraining 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 to make the distance on the optical axis between the central effective diameter part of the image side of the second lens and the object side of the third lens and the edge flange mechanism as small as possible, and avoid the risk of difficulty in forming and demolding the second lens and the third lens due to too large axial spacing at these two places.

[0074] In this embodiment, the outer diameter D5s of the object side of the fifth spacer element and the outer diameter D6s of the object side of the sixth spacer element satisfy: 1.00 < D6s / D5s < 1.15. By constraining the proportional relationship between the outer diameters of the object sides of the fifth spacer element and the sixth spacer element, it helps to control the smooth transition of the outer contour on the image side of the lens barrel, ensure consistent shrinkage of the lens barrel during molding, 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 to reasonably arrange the effective focal lengths of the fifth lens and the sixth lens, 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 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 axial distance EP45 between the image side of the fourth spacer element and 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 following relationship is satisfied between 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: 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 conducive to the reasonable arrangement of each structure in the lens barrel, leaving room for optimization and improvement of subsequent imaging performance and yield.

[0080] In this embodiment, the following relationship is satisfied among 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: . 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 conducive to ensuring that the imaging light can fully reach the imaging surface, guaranteeing high-quality imaging, and at the same time ensuring that the image side end of the lens barrel has a certain thickness and 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 process of simulation using the software and / or tools such as those described above, the surface profiles of each lens can be appropriately adjusted according to the surface profiles自带 by the software and / or tool 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 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 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 disposed between the first lens and the second lens and contacting the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and contacting the image side surface of the second lens, a fifth spacer element disposed between the fifth lens and the sixth lens and contacting the image side surface of the fifth lens, and a sixth spacer element disposed between the sixth lens and the seventh lens and contacting 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°; 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.

[0084] The optical imaging lens of the present application is composed of a lens barrel and 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 there is a large difference in the curvature radii of the object side surface and the image side surface of the first lens. 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] Certainly, 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 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 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 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; the spacer element group includes a first spacer element disposed between the first lens and the second lens and contacting 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 consists of a lens barrel and seven lenses and multiple spacer elements disposed 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 shift, 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 shift, improving the imaging quality and resolution of the optical imaging lens, and at the same time ensuring good performance stability of the optical imaging lens.

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

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

[0090] The optical imaging lens in this application may utilize multiple lenses, such as the seven lenses described above. In this application, at least one of the lens surfaces is an aspheric surface. Aspheric lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspheric lenses have a better curvature radius characteristic, with the advantages of improving distortion and astigmatism. The use of aspheric lenses can minimize aberrations that occur during imaging, thereby improving image quality.

[0091] However, those skilled in the art will appreciate that the number of lenses comprising the optical imaging lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments describe an optical imaging lens using seven lenses as an example, the optical imaging lens is not limited to including seven lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0092] Figure 1 A dimension 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 labeled to provide a clear and intuitive understanding of their meaning. To facilitate the description of optical imaging lenses and specific lens surface shapes, these parameters will not be reflected in the drawings when describing specific embodiments.

[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 Example 1, there are three examples: Example 1-1, Example 1-2, and Example 1-3; in Example 2, there are three examples: Example 2-1, Example 2-2, and Example 2-3; and in Example 3, there are three examples: Example 3-1, Example 3-2, and Example 3-3. While the parameters such as the radius of curvature and center thickness of the first through seventh lenses, as well as the spacing between the lenses and the higher-order coefficients of the optical imaging lenses in the three examples of the same embodiment are the same, the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel and the first through seventh spacers 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] Example 1

[0097] like Figures 2 to 7 As shown, the optical imaging lens of embodiment 1 is described. Figure 2 1-1 shows a schematic structural diagram of the optical imaging lens of Example 1-1. Figure 3 Schematic diagram of the structure of the optical imaging lens of Example 1-2 is shown. Figure 4 Schematic diagrams of the structures of the optical imaging lenses of Examples 1-3 are 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 spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, and a seventh spacer P7, which are arranged in sequence from the object side to the image side along the optical axis in the lens barrel P0.

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

[0100] like Figure 3 FIG2 is a schematic structural diagram of the optical imaging lens of Example 1-2. This example differs from Example 1-1 in that a fourth auxiliary spacer element P4b is further provided on the image side of the fourth spacer element P4. The object-side and image-side surfaces of the fourth auxiliary spacer element P4b contact the image-side surface of the fourth spacer element P4 and the object-side surface S9 of the fifth lens element, respectively. The contact structure of the remaining spacer elements is the same as that of Example 1-1. Please refer to the relevant description of Example 1-1 and will not be repeated here.

[0101] like Figure 4 FIG2 is a schematic structural diagram of the optical imaging lens of Example 1-3. This example differs from Example 1-2 in that a second auxiliary spacer element P2b is further provided on the image side of the second spacer element P2. The object-side and image-side surfaces of the second auxiliary spacer element P2b contact the image-side surface of the second spacer element P2 and the object-side surface S5 of the third lens element, respectively. The contact structure of the remaining spacer elements is the same as that of Example 1-2, and reference may be made to the relevant description of Example 1-2, which will not be repeated here.

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

[0103] Table 2

[0104]

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

[0106] In Example 1, the maximum half field of view 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 parameters of the optical imaging lens of Example 1, where the units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S15 and S16 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S17 (not shown) represents the imaging surface.

[0108] Table 3

[0109]

[0110] In Example 1, the object-side surface and the image-side surface of the first lens element E1 to the seventh lens element E7 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0111] Formula (1).

[0112] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; and Ai is the correction coefficient for the i-th order of the aspheric surface. Table 4 below lists the higher-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 Example 1 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 Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the optical imaging lens of Example 1 is shown, which represents the distortion 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 Example 1 can achieve good imaging quality.

[0117] Example 2

[0118] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-1. Figure 9 FIG2 shows a schematic structural diagram of the optical imaging lens of Example 2-2. Figure 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 spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, and a seventh spacer P7, which are arranged in sequence from the object side to the image side along the optical axis in the lens barrel P0.

[0120] like Figure 8 2-1. FIG. 2-3 shows a schematic diagram of the structure of an optical imaging lens according to Example 2-1. In this example, the object-side and image-side surfaces of the first spacer element P1 contact the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 contact the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 contact the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 contact the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively. The object-side and image-side surfaces of the fifth spacer element P5 contact the image-side surface S10 of the fifth lens and the object-side surface S11 of the sixth lens, respectively. The object-side and image-side surfaces of the sixth spacer element P6 contact 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 contacts the image-side surface S14 of the seventh lens.

[0121] like Figure 9 FIG2 is a schematic structural diagram of an optical imaging lens according to Example 2-2. This example differs from Example 2-1 in that the image side of the first spacer element P1 is further provided in sequence with a first auxiliary spacer element P1b and a first auxiliary spacer element P1c, and the image side of the fourth spacer element P4 is further provided in sequence with a fourth auxiliary spacer element P4b and a fourth auxiliary spacer element P4c. The object-side and image-side surfaces of the first auxiliary spacer element P1b contact the image-side surface of the first spacer element P1 and the object-side surface of the first auxiliary spacer element P1c, respectively. The image-side surface of the first auxiliary spacer element P1c contacts the object-side surface S3 of the second lens element. The object-side and image-side surfaces of the fourth auxiliary spacer element P4b contact the image-side surface of the fourth spacer element P4 and the object-side surface of the fourth auxiliary spacer element P4c, respectively. The image-side surface of the fourth auxiliary spacer element P4c contacts the object-side surface S9 of the fifth lens element. The contact structure of the remaining spacers is the same as that of Example 2-1. Please refer to the relevant description of Example 2-1 and will not be repeated here.

[0122] like Figure 10 , which is a schematic structural diagram of the optical imaging lens of Example 2-3. This example differs from Example 2-2 in that the first auxiliary spacer element P1c is not provided, and a third auxiliary spacer element P3b is provided 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 reference may be made to the relevant description in Example 2-2, 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 Example 2, the first lens E1 has negative focal power, with its object-side surface S1 being concave, and its image-side surface S2 being concave. The second lens E2 has negative focal power, with its object-side surface S3 being convex, and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being concave, and its image-side surface S6 being convex. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex, and its image-side surface S8 being concave. The fifth lens E5 has negative focal power, with its object-side surface S9 being convex, and its image-side surface S10 being concave. The sixth lens E6 has positive focal power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative focal power, with its object-side surface S13 being concave, and its image-side surface S14 being 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 parameters of the optical imaging lens of Example 2, where the units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S15 and S16 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S17 (not shown) represents 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] Figure 11 The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 12 The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 13 The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion 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] Example 3

[0137] like Figures 14 to 19As shown, the optical imaging lens of Example 3 is described. Figure 14 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-1. Figure 15 FIG3 shows a schematic structural diagram of the optical imaging lens of Example 3-2. Figure 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 spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, and a seventh spacer P7, which are arranged in sequence from the object side to the image side along the optical axis in the lens barrel P0.

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

[0140] like Figure 15FIG3 is a schematic structural diagram of an optical imaging lens according to Example 3-2. This example differs from Example 3-1 in that the image side of the second spacer element P2 is further 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 further provided with a third auxiliary spacer element P3b and a third auxiliary spacer element P3c, respectively. The object-side and image-side surfaces of the second auxiliary spacer element P2b contact the image-side surface and the second auxiliary spacer element P2c, respectively, of the second spacer element P2b, while the image-side surface of the second auxiliary spacer element P2c contacts the object-side surface S5 of the third lens element. The object-side and image-side surfaces of the third auxiliary spacer element P3b contact the image-side surface and the object-side surface of the third auxiliary spacer element P3c, respectively, while the image-side surface of the third auxiliary spacer element P3c contacts the object-side surface S7 of the fourth lens element. The contact structure of the remaining spacers is the same as that of Example 3-1, and reference may be made to the relevant description in Example 3-1, which will not be repeated here.

[0141] like Figure 16 FIG3 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. Please refer to the relevant description of Example 3-2 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 Example 3, the first lens E1 has negative focal power, with its object-side surface S1 being convex, and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being concave, and its image-side surface S4 being convex. The third lens E3 has positive focal power, with its object-side surface S5 being concave, and its image-side surface S6 being convex. The fourth lens E4 has positive focal power, with its object-side surface S7 being convex, and its image-side surface S8 being concave. The fifth lens E5 has positive focal power, with its object-side surface S9 being convex, and its image-side surface S10 being convex. The sixth lens E6 has positive focal power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative focal power, with its object-side surface S13 being concave, and its image-side surface S14 being 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 parameters of the optical imaging lens of Example 3, where the units for the radius of curvature and thickness / distance are all in millimeters. In the table below, OBJ (not shown) represents the object distance. STO (not shown) represents the aperture stop, located between the second lens element E2 and the third lens element E3. S15 and S16 (not shown) can be the object-side and image-side surfaces of a filter or the object-side and image-side surfaces of a protective glass. S17 (not shown) represents the imaging surface.

[0148] Table 9

[0149]

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

[0151] Table 10

[0152]

[0153] Figure 17 The axial chromatic aberration curve of the optical imaging lens of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 18 The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 19 The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion 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 Example 3 can achieve good imaging quality.

[0155] In summary, Examples 1 to 3 respectively satisfy the relationships 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] This application also provides an imaging device, whose electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0162] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0164] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0165] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection 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. 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 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 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 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 spacer element to the object side surface of the second spacer element on the optical axis, and the spacing distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis satisfy the following conditions: 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 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 the following relationship: -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 the following: 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. An effective radius DT52 of the image side surface of the fifth lens, an effective radius DT51 of the object side surface of the fifth lens, and a 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.

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 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 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 the following conditions: 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 the following conditions: .

Images