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, the lens group and the spacing element group are arranged in the lens barrel, the lens group is composed of six lenses, and the six lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side; t12 / CP1lt is greater than or equal to 29.00; 50.00, 50.00, 50.00; the following conditions are satisfied: 2.50 lt; d1s / EPDlt; 3.50, 3.50; the following conditions are satisfied: 1.20 lt; cT3 / (CT2 + CP2) lt; and 4.90. According to the optical imaging lens, the problem of poor assembling stability caused by the fact that two adjacent lenses at the front end are controlled to have a relatively large interval in a six-piece optical imaging lens in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an optical imaging lens. Background Art

[0002] With the increasing popularity of electronic devices such as virtual reality, augmented reality, and mixed reality, the optical imaging lenses applied to these electronic devices have received increasing attention from users. The six-piece optical imaging lens is widely used in various fields because of its compact structure, high cost-effectiveness, and good optical performance.

[0003] Currently, in order to meet the requirements of a large field of view, the six-piece optical imaging lens usually needs to control a large air gap between two adjacent front lenses. However, in this case, a large air gap between the front lenses of the optical imaging lens easily causes stress concentration or instability during the assembly process, thereby affecting the lenses.

[0004] That is to say, the six-piece optical imaging lens in the prior art has a problem that controlling a large gap between two adjacent front lenses leads to poor assembly stability. Summary of the Invention

[0005] The main object of the present invention is to provide an optical imaging lens to solve the problem that the six-piece optical imaging lens in the prior art has a large gap between two adjacent front lenses, resulting in poor assembly stability.

[0006] To achieve the above object, according to an aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, there is an air gap between adjacent two of the first lens to the sixth lens on the optical axis of the optical imaging lens, and the air gap between the first lens and the second lens on the optical axis is the largest. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial 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 partial 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 partial 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 partial contact with the image side surface of the fifth lens. Among them, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 29.00 ≤ T12 / CP1 < 50.00; the outer diameter D1s of the object side surface of the first spacer element and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.50 < D1s / EPD < 3.50; the central thickness CT3 of the third lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the maximum axial thickness CP2 of the second spacer element satisfy: 1.20 < CT3 / (CT2 + CP2) < 4.90.

[0007] According to another aspect of the present invention, there is provided an optical imaging lens, comprising a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, there is an air gap between adjacent two of the first lens to the sixth lens on the optical axis of the optical imaging lens, and the air gap between the first lens and the second lens on the optical axis is the largest. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial 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 partial 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 partial 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 partial contact with the image side surface of the fifth lens. Among them, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 29.00 ≤ T12 / CP1 < 50.00; the outer diameter D1s of the object side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, and the entrance pupil diameter EPD of the optical imaging lens satisfy: 0.77 < (D1s - d1s) / EPD < 1.82; the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacer element, and the outer diameter D3s of the object side surface of the third spacer element satisfy: 1.85 < f3 / (D3s - d3s) ≤ 3.60.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, there is an air gap on the optical axis of the optical imaging lens between adjacent two of the first lens to the sixth lens, and the air gap between the first lens and the second lens on the optical axis is the largest. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial 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 partial 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 partial 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 partial contact with the image side surface of the fifth lens. Among them, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 29.00 ≤ T12 / CP1 < 50.00; the effective focal length f1 of the first lens, the maximum axial thickness CP1 of the first spacer element, and the central thickness CT1 of the first lens on the optical axis satisfy: -12.10 < f1 / (CP1 + CT1) < -8.90; the inner diameter d2s of the object side surface of the second spacer element and the inner diameter d1m of the image side surface of the first spacer element satisfy: 0.90 < d2s / d1m < 1.15.

[0009] Further, the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -5.10 < f4 / d4s < -1.00.

[0010] Further, the effective focal length f5 of the fifth lens and the interval distance EP45 on the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element satisfy: 3.10 < f5 / EP45 < 5.10.

[0011] Further, the inner diameter d0s of the object side surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy: 2.70 < d0s / R1 < 3.70; the effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -4.40 < f1 / R2 < -3.80.

[0012] Further, the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacer element, and the outer diameter D3s of the object side surface of the third spacer element satisfy: 1.85 < f3 / (D3s - d3s) ≤ 3.60.

[0013] Furthermore, the maximum axial thickness CP3 of the third spacer element and the air space T34 between the third lens and the fourth lens on the optical axis satisfy: 0.70 < CP3 / T34 < 2.35.

[0014] Furthermore, the effective focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 0.87 < f5 / R9 < 1.26; the radius of curvature R10 of the image side surface of the fifth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -10.62 < R10 / (D4s - d4s) ≤ -0.75.

[0015] Furthermore, the radius of curvature R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacer element satisfy: -2.05 < R3 / d1m < -0.65; the radius of curvature R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer element satisfy: -1.60 < R4 / d2s < -0.80.

[0016] Furthermore, the inner diameter d5m of the image side surface of the fifth spacer element, the central thickness CT6 of the sixth lens on the optical axis, and the refractive index N6 of the sixth lens satisfy: 4.20 ≤ d5m / CT6 / N6 < 6.20.

[0017] Furthermore, the outer diameter D1s of the object side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, and the entrance pupil diameter EPD of the optical imaging lens satisfy: 0.77 < (D1s - d1s) / EPD < 1.82.

[0018] Furthermore, the axial distance SAG12 between the intersection point of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens, the central thickness CT1 of the first lens on the optical axis, and the maximum axial thickness CP1 of the first spacer element satisfy: 1.60 < SAG12 / (CT1 + CP1) < 2.30.

[0019] Furthermore, the spacer element group further includes a third auxiliary spacer element disposed between the third spacer element and the fourth lens and in partial contact with the image side surface of the third spacer element. The outer diameter D3bs of the object side surface of the third auxiliary spacer element, the inner diameter d3bs of the object side surface of the third auxiliary spacer element, and the air space T34 between the third lens and the fourth lens on the optical axis satisfy: 4.40 ≤ (D3bs - d3bs) / T34 ≤ 5.70.

[0020] Furthermore, the inner diameter d0m of the image side surface of the lens barrel and the effective focal length f6 of the sixth lens satisfy: -2.20 < d0m / f6 ≤ -0.65.

[0021] Furthermore, the axial distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element on the optical axis and the axial distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element on the optical axis satisfy: 1.09 ≤ EP23 / EP34 ≤ 1.84.

[0022] Furthermore, the spacer element group further includes a fourth auxiliary spacer element disposed between the fourth spacer element and the fifth lens and in partial contact with the image side surface of the fourth spacer element. The combined focal length f45 of the fourth lens and the fifth lens, the maximum axial thickness CP4 of the fourth spacer element, and the maximum axial thickness CP4b of the fourth auxiliary spacer element satisfy: 1.70 < f45 / (CP4 + CP4b) < 2.85.

[0023] Furthermore, the first lens has a negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has an optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is convex; the third lens has a positive optical power, and the image side surface of the third lens is convex; the fourth lens has a negative optical power; the fifth lens has a positive optical power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is convex; the sixth lens has a negative optical power, and the image side surface of the sixth lens is concave.

[0024] Applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel and six lenses and spacer elements arranged in the lens barrel. By reasonably arranging the positions of the six lenses and the first to fifth spacer elements, and setting the optical imaging lens to have the largest air gap on the optical axis between the first lens and the second lens at the front end, there is a large air gap between the first lens and the second lens. When light rays with a large field of view enter the optical imaging lens, in this case, stress concentration or instability is likely to occur during the assembly process of the front-end lenses. Therefore, by restricting 29.00 < T12 / CP1 < 50.00, 2.50 < D1s / EPD < 3.50, and 1.20 < CT3 / (CT2 + CP2) < 4.90, on the basis of optimizing the incident angle of light rays and ensuring the transmission space of light rays between the first lens and the second lens, the overall structure and the symmetry of the effective diameter surface of the second lens and the third lens can be controlled, which is beneficial to the molding and assembly of the second lens and the third lens, avoiding the risk of deformation of the second lens and the third lens under pressure during the assembly process, ensuring the assembly stability of the lenses, and further ensuring the assembly stability of the optical imaging lens. Description of the Drawings

[0025] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 Shows the dimension marking diagram of the optical imaging lens of an alternative embodiment of the present invention;

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

[0028] Figure 3 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1-2 of the present invention;

[0029] Figure 4 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1-3 of the present invention;

[0030] Figure 5 and Figure 6 respectively show the astigmatism curve and the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1 of the present invention;

[0031] Figure 7 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2-1 of the present invention;

[0032] Figure 8 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2-2 of the present invention;

[0033] Figure 9 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2-3 of the present invention;

[0034] Figure 10 and Figure 11 respectively show the astigmatism curve and the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 2 of the present invention;

[0035] Figure 12 Shows the schematic structural diagram of the optical imaging lens of Embodiment 3-1 of the present invention;

[0036] Figure 13 Shows the schematic structural diagram of the optical imaging lens of Embodiment 3-2 of the present invention;

[0037] Figure 14 Shows the schematic structural diagram of the optical imaging lens of Embodiment 3-3 of the present invention;

[0038] Figure 15 and Figure 16 respectively show the astigmatism curve and the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 3 of the present invention;

[0039] Figure 17Shows the assembly stress diagram of the second lens and the third lens of the optical imaging lens of Solution 1 of the present application when T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 1.25 on the premise that the air gap between the first lens and the second lens on the optical axis is the largest;

[0040] Figure 18 Shows the assembly stress diagram of the second lens and the third lens of the optical imaging lens of Example 1 when T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 0.50 on the premise that the air gap between the first lens and the second lens on the optical axis is the largest;

[0041] Figure 19 Shows the assembly stress diagram of the second lens and the third lens of the optical imaging lens of Example 2 when T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 6.00 on the premise that the air gap between the first lens and the second lens on the optical axis is the largest.

[0042] Wherein, the above-mentioned drawings include the following reference numerals:

[0043] P0, lens barrel; E1, first lens; P1, first spacer element; E2, second lens; P2, second spacer element; E3, third lens; P3, third spacer element; P3b, third auxiliary spacer element; E4, fourth lens; P4, fourth spacer element; P4b, fourth auxiliary spacer element; E5, fifth lens; P5, fifth spacer element; P5b, fifth auxiliary spacer element; E6, sixth lens; S1, object side of the first lens; S2, image side of the first lens; S3, object side of the second lens; S4, image side of the second lens; S5, object side of the third lens; S6, image side of the third lens; S7, object side of the fourth lens; S8, image side of the fourth lens; S9, object side of the fifth lens; S10, image side of the fifth lens; S11, object side of the sixth lens; S12, image side of the sixth lens. Detailed implementation manners

[0044] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0045] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0046] In the present invention, unless otherwise specified, the orientation terms such as "upper", "lower", "top", and "bottom" generally refer to the directions shown in the drawings, or to the vertical, perpendicular, or gravitational directions of the components themselves; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation terms do not limit the present invention.

[0047] 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 teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0048] In the drawings, for ease of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0049] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the positive and negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side as an example, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; taking the image side as an example, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0050] In the present 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 (not shown in the figure). Hereinafter, the object side surface of the lens refers to the surface on the side of the lens facing the object to be photographed (not shown in the figure), and the image side surface of the lens refers to the surface on the side of the lens facing the imaging surface (not shown in the figure). In the structural schematic diagram shown in the present application, the left side is the object side and the right side is the image side.

[0051] In order to solve the problem in the prior art that the six-piece optical imaging lens has a large gap between two adjacent lenses at the front end, resulting in poor assembly stability, the present invention provides an optical imaging lens.

[0052] Such as Figures 1 to 19As 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 six lenses. The six lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, there is an air gap on the optical axis between adjacent two of the first lens to the sixth lens, and the air gap between the first lens and the second lens on the optical axis is the largest. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial 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 partial 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 partial 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 partial contact with the image side surface of the fifth lens. Among them, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 29.00 ≤ T12 / CP1 < 50.00; the outer diameter D1s of the object side surface of the first spacer element and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.50 < D1s / EPD < 3.50; the central thickness CT3 of the third lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the maximum axial thickness CP2 of the second spacer element satisfy: 1.20 < CT3 / (CT2 + CP2) < 4.90.

[0053] The optical imaging lens of the present application is composed of a lens barrel, six lenses, and spacer elements disposed in the lens barrel. By reasonably arranging the positions of the six lenses and the first spacer element to the fifth spacer element, and setting the optical imaging lens to satisfy that the air gap between the first lens and the second lens at the front end on the optical axis is the largest, there is a large air gap between the first lens and the second lens. When light rays with a large field of view enter the optical imaging lens, in this case, stress concentration or instability is likely to occur in the front-end lens during the assembly process. Therefore, by restricting 29.00 < T12 / CP1 < 50.00, 2.50 < D1s / EPD < 3.50, and 1.20 < CT3 / (CT2 + CP2) < 4.90, on the basis of optimizing the incident angle of light rays and ensuring the transmission space of light rays between the first lens and the second lens, the overall structure and the uniformity of the effective diameter surface of the second lens and the third lens can be controlled, which is beneficial to the molding and assembly of the second lens and the third lens, avoids the risk of deformation of the second lens and the third lens under pressure during the assembly process, ensures the assembly stability of the lenses, and further ensures the assembly stability of the optical imaging lens.

[0054] In addition, referring to Table 1 below, Figures 17 to 19As shown, on the premise that the air gap between the first lens and the second lens on the optical axis of the optical imaging lens is the largest, Figure 17 The assembled stress diagram of the second lens and the third lens of the optical imaging lens of Solution 1 of the present application when T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 1.25 is shown. Figure 18 The assembled stress diagram of the second lens and the third lens of the optical imaging lens of Example 1 when T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 0.50 is shown. Figure 19 The assembled stress diagram of the second lens and the third lens of the optical imaging lens of Example 2 when T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 6.00 is shown.

[0055] From Figures 17 to 19It can be seen that when the optical imaging lens satisfies T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 1.25, under the state of being pressed during assembly, the assembly stress of the second lens and the third lens is relatively small, especially the assembly stress at the edge parts of the second lens and the third lens is relatively small, the maximum value of the assembly stress is 9.0411 Mpa, and the assembly stability is good; under the same assembly pressure, when the optical imaging lens satisfies T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 0.50 Mpa, the assembly stress of the second lens and the third lens increases, especially the assembly stress at the edge parts of the second lens and the third lens increases, and the maximum value of the assembly stress is 10.543 Mpa. Under the same assembly pressure, when the optical imaging lens satisfies T12 / CP1 = 42.54, D1s / EPD = 2.57, and CT3 / (CT2 + CP2) = 6.00, the assembly stress of the second lens and the third lens increases significantly, the assembly stability of the second lens and the third lens is poor, and the maximum value of the assembly stress is 10.6. Thus, it can be seen that when 29.00 ≤ T12 / CP1 < 50.00 and 2.50 < D1s / EPD < 3.50 and CT3 / (CT2 + CP2) is controlled within the range of 1.20 to 4.90, under the state of being pressed during assembly, the assembly stress of the second lens and the third lens is relatively small, the influence of the assembly pressure on the lens is reduced, and the assembly stability is the best. Therefore, by restricting 29.00 ≤ T12 / CP1 < 50.00, 2.50 < D1s / EPD < 3.50, and 1.20 < CT3 / (CT2 + CP2) < 4.90, the present application can, on the basis of optimizing the incident angle of light and ensuring the transmission space of light between the first lens and the second lens, control the overall structure and the symmetry of the effective diameter surface of the second lens and the third lens, which is beneficial to the forming and assembly of the second lens and the third lens, avoid the risk of deformation of the second lens and the third lens under pressure during the assembly process, ensure the assembly stability of the lens, and further ensure the assembly stability of the optical imaging lens.

[0056] Table 1

[0057] Solution 1 of this application Example 1 Example 2 T12 / CP1 42.54 42.54 42.54 D1s / EPD 2.57 2.57 2.57 CT3 / (CT2 + CP2) 1.25 0.50 6.00

[0058] In the present embodiment, the spacer element group further includes a third auxiliary spacer element disposed between the third spacer element and the fourth lens and in contact with the image-side surface portion of the third spacer element, and a fourth auxiliary spacer element disposed between the fourth spacer element and the fifth lens and in contact with the image-side surface portion of the fourth spacer element.

[0059] In this embodiment, the following condition is satisfied between the effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer element: -5.10 < f4 / d4s < -1.00. Through this conditional expression, the effective focal length of the fourth lens can be controlled, which not only enables the light rays from the first lens, the second lens, and the third lens to enter the fourth lens better, but also helps to control the surface shape trend of the fourth lens, improve the overall processability of the fourth lens. At the same time, by appropriately adjusting the inner diameter of the object side surface of the fourth spacer element, the effective contact amount between the object side surface of the fourth spacer element and the image side surface of the fourth lens can be increased, the contact step difference between the object side surface of the fourth spacer element and the image side surface of the fourth lens can be reduced, and the assembly stability can be improved.

[0060] In this embodiment, the following condition is satisfied between the effective focal length f5 of the fifth lens and the axial distance EP45 between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element on the optical axis: 3.10 < f5 / EP45 < 5.10. Through this conditional expression, the effective focal length of the fifth lens can be effectively controlled, avoiding problems such as severe bending of the fifth lens, too large main ray exit angle, and too large field of view due to too short effective focal length of the fifth lens, which in turn leads to an increase in distortion, too low relative contrast of the optical imaging lens, and difficulty in aberration correction; at the same time, it also avoids the problem of too long axial length of the optical imaging lens due to too long effective focal length of the fifth lens. In addition, by controlling the axial distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element on the optical axis, the edge thickness of the fifth lens can be effectively controlled, which is beneficial to ensuring the reliability of the injection molding and processing of the fifth lens.

[0061] In this embodiment, the following conditions are satisfied between the inner diameter d0s of the object side surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens: 2.70 < d0s / R1 < 3.70; the following condition is satisfied between the effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens: -4.40 < f1 / R2 < -3.80. Through these conditional expressions, the effective focal length of the first lens, the curvature radii of the object side surface and the image side surface of the first lens can be controlled, and the surface shape structure of the first lens can be effectively controlled, so that the first lens forms a convex structure towards the object side of the optical imaging lens, ensuring that the optical imaging lens obtains a larger light entrance amount, thereby meeting the large field of view requirements of the optical imaging lens. At the same time, the inner diameter of the object side surface of the lens barrel can also be controlled to avoid the lens barrel blocking the incident light entering the optical imaging lens, which is beneficial to the imaging of the optical imaging lens.

[0062] In this embodiment, the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacer element, and the outer diameter D3s of the object side surface of the third spacer element satisfy: 1.85 < f3 / (D3s - d3s) ≤ 3.60. Through this conditional expression, the difference between the outer diameter and the inner diameter of the object side surface of the third spacer element can be controlled, and indirectly, the radial bearing length between the image side surface of the third lens and the object side surface of the third spacer element can be controlled, avoiding the situation where the radial bearing length is too small, which may lead to unstable assembly of the lens and spacer element in the middle of the optical imaging lens; it also avoids the situation where the radial bearing length is too large, which may lead to poor flatness of the object side surface of the third spacer element, affecting the assembly accuracy of the optical imaging lens. At the same time, by controlling the effective focal length of the third lens, the chief ray distribution of the front lens and the rear lens can be controlled, effectively controlling the field of view size and the axial length of the optical imaging lens.

[0063] In this embodiment, the maximum axial thickness CP3 of the third spacer element and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 0.70 < CP3 / T34 < 2.35. Through this conditional expression, the ratio of the maximum axial thickness of the third spacer element to the air interval between the third lens and the fourth lens on the optical axis can be controlled, effectively constraining the sagittal height of the image side surface of the third lens and the object side surface of the fourth lens, keeping the sagittal height of the lens within a reasonable range, which is beneficial to ensuring the molding filling of the third lens and the fourth lens and reducing the risk of weld lines during the injection molding process of the third lens and the fourth lens. Here, the sagittal height is the axial interval distance between the intersection of the lens surface and the optical axis and the vertex of the effective radius of this surface of the lens.

[0064] In this embodiment, the effective focal length f5 of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 0.87 < f5 / R9 < 1.26; the curvature radius R10 of the image side surface of the fifth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -10.62 < R10 / (D4s - d4s) ≤ -0.75. Through this conditional expression, the surface shape and structure of the fifth lens can be controlled, and then a fifth lens with a gentle surface shape, reasonable structure, and convenient for molding can be obtained. At the same time, the difference between the outer diameter and the inner diameter of the object side surface of the fourth spacer element can be controlled, which can constrain the radial bearing length between the fourth spacer element and the lenses or spacer elements on both sides, thereby improving the assembly stability of the optical imaging lens.

[0065] In this embodiment, the following conditions are satisfied between the radius of curvature R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacer element: -2.05 < R3 / d1m < -0.65; the following conditions are satisfied between the radius of curvature R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer element: -1.60 < R4 / d2s < -0.80. Through this conditional expression, the surface shape of the second lens can be effectively controlled, thereby controlling the amount of light and the light angle entering the second lens. At the same time, the inner diameter of the image side surface of the first spacer element and the inner diameter of the object side surface of the second spacer element can also be controlled, so as to intercept non-effective light, further limit the light entering the second lens, and reduce the risk of stray light. In addition, controlling the inner diameters of the first spacer element and the second spacer element can constrain the relative illuminance and f-number of the optical imaging lens, and optimize the optical principal value parameters of the optical imaging lens.

[0066] In this embodiment, the following conditions are satisfied between the inner diameter d5m of the image side surface of the fifth spacer element, the central thickness CT6 of the sixth lens on the optical axis, and the refractive index N6 of the sixth lens: 4.20 ≤ d5m / CT6 / N6 < 6.20. Through this conditional expression, the inner diameter of the image side surface of the fifth spacer element can be controlled, the marginal light entering the sixth lens can be constrained, and the risk of stray light caused by too large an inner diameter of the image side surface of the fifth spacer element can be avoided. At the same time, the refractive index of the sixth lens can also be controlled appropriately, thereby controlling the angle of the light entering the imaging surface through the sixth lens, and ensuring that the principal ray incident angle of the optical imaging lens is appropriate.

[0067] In this embodiment, the following conditions are satisfied between the outer diameter D1s of the object side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, and the entrance pupil diameter EPD of the optical imaging lens: 0.77 < (D1s - d1s) / EPD < 1.82. Through this conditional expression, the relationship between the difference between the outer diameter and the inner diameter of the object side surface of the first spacer element and the entrance pupil diameter can be controlled, the light passing amount of the light entering the second lens can be adjusted, the stray light generated by passing through the second lens can be reduced, and at the same time, the first spacer element can effectively intercept the marginal non-effective light, thereby reducing the stray light formed by the internal reflection of the non-effective light between the first lens and the sixth lens. At the same time, it can also ensure that the first spacer element does not block the effective light, which is beneficial to improving the relative illuminance and imaging quality of the optical imaging lens.

[0068] In this embodiment, the axial distance SAG12 between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens, the central thickness CT1 of the first lens on the optical axis, and the maximum axial thickness CP1 of the first spacer element satisfy: 1.60 < SAG12 / (CT1 + CP1) < 2.30. Through this conditional formula, the surface shape and structure of the first lens can be controlled, which is beneficial to controlling the incident light quantity and direction of effective light rays, optimizing the optical principal value parameters of the optical imaging lens. At the same time, the maximum axial thickness of the first spacer element can also be controlled, thereby controlling the edge thicknesses of the first lens and the second lens, and controlling the edge thickness ratio of the first lens and the second lens within a range convenient for processing, reducing the risk of welding marks generated during the molding process of the first lens and the second lens.

[0069] In this embodiment, the outer diameter D3bs of the object side surface of the third auxiliary spacer element, the inner diameter d3bs of the object side surface of the third auxiliary spacer element, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 4.40 ≤ (D3bs - d3bs) / T34 ≤ 5.70. Through this conditional formula, the difference between the outer diameter and the inner diameter of the object side surface of the third auxiliary spacer element can be controlled, ensuring that the third auxiliary spacer element can effectively block peripheral stray light, thereby reducing the risk of stray light rays entering the fourth lens. Additionally, by controlling the inner diameter size of the third auxiliary spacer element, the aperture number and relative illuminance of the optical imaging lens can be adjusted, improving the final imaging quality. Furthermore, by controlling the air gap between the third lens and the fourth lens on the optical axis, the surface shape trend and light ray transmission path of the third lens and the fourth lens can be controlled, which is beneficial to controlling the effective focal length of the optical imaging lens to be appropriate.

[0070] In this embodiment, the inner diameter d0m of the image side surface of the lens barrel and the effective focal length f6 of the sixth lens satisfy: -2.20 < d0m / f6 ≤ -0.65. Through this conditional formula, the inner diameter of the image side surface of the lens barrel can be controlled, thereby controlling the distance between the rear-end edge light rays of the optical imaging lens and the image side surface of the lens barrel, avoiding interference caused by the outgoing light rays contacting the lens barrel. At the same time, by controlling the effective focal length of the sixth lens, the trend of the rear-end light rays can be restricted, thereby optimizing the chief ray angle CRA of the optical imaging lens and ensuring good imaging performance of the optical imaging lens.

[0071] In this embodiment, 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 and the distance EP34 on the optical axis from the image side of the third spacer element to the object side of the fourth spacer element satisfy: 1.09 ≤ EP23 / EP34 ≤ 1.84. Through this conditional expression, the distances on the optical axis from the second spacer element to the third spacer element and from the image side of the third spacer element to the object side of the fourth spacer element can be controlled, indirectly controlling the edge thicknesses of the third lens and the fourth lens within a reasonable range, which is beneficial to reasonably setting the gate and edge thickness ratio of the third lens and the fourth lens and is beneficial to the injection molding of the third lens and the fourth lens.

[0072] In this embodiment, the combined focal length f45 of the fourth lens and the fifth lens, the maximum axial thickness CP4 of the fourth spacer element, and the maximum axial thickness CP4b of the fourth auxiliary spacer element satisfy: 1.70 < f45 / (CP4 + CP4b) < 2.85. Through this conditional expression, the combined focal length of the fourth lens and the fifth lens can be controlled, which is beneficial to controlling the overall surface shape trend of the fourth lens and the fifth lens. At the same time, the maximum axial thicknesses of the fourth spacer element and the fourth auxiliary spacer element can also be controlled, thereby controlling the edge structural dimensions of the fourth lens and the fifth lens, restricting the sagittal height dimensions of the fourth lens and the fifth lens, and being beneficial to the processing and molding of the fourth lens and the fifth lens.

[0073] In this embodiment, the first lens has a negative optical power, the object side of the first lens is convex, and the image side of the first lens is concave; the second lens has an optical power, and the object side of the second lens is concave; the third lens has a positive optical power, and the image side of the third lens is convex; the fourth lens has a negative optical power; the fifth lens has a positive optical power, the object side of the fifth lens is convex, and the image side of the fifth lens is convex; the sixth lens has a negative optical power, and the image side of the sixth lens is concave. In the optical imaging lens, the first lens with a negative optical power initially diverges the incident light. After being transmitted by the second lens, the third lens effectively converges the light. The fourth lens with a negative optical power diverges the light again, reducing the aberration caused by excessive convergence. At the rear end of the optical imaging lens, the fifth lens has a positive optical power, and both the object side and the image side of the fifth lens are convex, further strengthening the convergence of the light and effectively controlling the exit angle of the chief ray, ensuring more accurate focusing of the light before imaging. Finally, the sixth lens has a negative optical power and the image side of the sixth lens is concave, providing a divergent adjustment for the final focusing of the light, ensuring that the light can be accurately focused on the imaging surface.

[0074] Optionally, the optical imaging lens in the embodiments of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. In the process of simulation using the above software and / or tools, the surface profile of each lens can be simulated and appropriately adjusted according to the surface profile provided by the software and / or tool used.

[0075] In this embodiment, each lens can be selected as a trimmed lens. The outer diameter surface of the trimmed lens has a trimmed structure and a non-trimmed structure, and the outer diameter of the trimmed structure is smaller than the outer diameter of the non-trimmed structure. The outer diameter of the trimmed lens usually refers to the outer diameter of the non-trimmed structure.

[0076] In this embodiment, each spacer element can be selected as a trimming spacer element. The outer annular surface of the trimming spacer element has a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion is smaller than the outer diameter of the non-trimming portion. The outer diameter of the trimming spacer element usually refers to the maximum outer diameter of the non-trimming portion.

[0077] In addition, in another optional embodiment of the present application, an optical imaging lens is also provided, including a lens barrel and a lens group and a spacer element group arranged in the lens barrel, the lens group is composed of six lenses, and the six lenses are, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; wherein, there is an air gap between two adjacent lenses from the first lens to the sixth lens on the optical axis of the optical imaging lens, and the air gap between the first lens and the second lens on the optical axis is the largest; 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, and a spacer element placed between the third lens and the fourth lens and in contact with the image side surface of the third lens. a third spacing element, a fourth spacing 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 spacing element placed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; wherein, the air interval T12 on the optical axis from the first lens to the second lens and the maximum axial thickness CP1 of the first spacing element satisfy the following relationship: 29.00≤T12 / CP1<50.00; the outer diameter D1s of the object side surface of the first spacing element, the inner diameter d1s of the object side surface of the first spacing element and the entrance pupil diameter EPD of the optical imaging lens satisfy the following relationship: 0.77<(D1s-d1s) / EPD<1.82; the effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacing element and the outer diameter D3s of the object side surface of the third spacing element satisfy the following relationship: 1.85 <f3 / (D3s-d3s)≤3.60。

[0078] The optical imaging lens of the present application is composed of a lens barrel and six lenses and spacer elements arranged in the lens barrel. By reasonably arranging the positions of the six lenses and the first to fifth spacer elements, and setting the optical imaging lens to have a large air gap between the first lens and the second lens on the optical axis when the air gap between the first lens and the second lens at the front end is the largest. In this case, when light rays with a large field of view enter the optical imaging lens, stress concentration or instability is likely to occur during the assembly of the front-end lenses. Therefore, in the present application, by constraining 29.00 ≤ T12 / CP1 < 50.00, 0.77 < (D1s - d1s) / EPD < 1.82, and 1.85 < f3 / (D3s - d3s) ≤ 3.60, on the basis of ensuring the transmission space of light rays between the first lens and the second lens, the relationship between the difference in the outer diameter and inner diameter of the object side surface of the first spacer element and the entrance pupil diameter can be further controlled, the amount of light passing through the second lens can be adjusted, the stray light generated by the second lens can be reduced, and at the same time, the first spacer element can effectively intercept the marginal non-effective light rays, thereby reducing the stray light formed by the internal reflection of the non-effective light rays between the first lens and the sixth lens. At the same time, it can also ensure that the first spacer element does not block the effective light rays, which is beneficial to improving the relative illumination and imaging quality of the optical imaging lens. At the same time, the difference in the outer diameter and inner diameter of the object side surface of the third spacer element can be controlled, indirectly controlling the radial bearing length between the image side surface of the third lens and the object side surface of the third spacer element, avoiding the instability of the assembly of the lenses and spacer elements in the middle of the optical imaging lens caused by too small a radial bearing length, and also avoiding the poor flatness of the object side surface of the third spacer element caused by too large a radial bearing length, which affects the assembly accuracy of the optical imaging lens. At the same time, by controlling the effective focal length of the third lens, the principal ray distribution of the front-end lens and the rear-end lens can be controlled, effectively controlling the field of view size and axial length of the optical imaging lens.

[0079] 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.

[0080] 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 disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, there is an air gap on the optical axis of the optical imaging lens between adjacent two of the first lens to the sixth lens, and the air gap between the first lens and the second lens on the optical axis is the largest. The spacer element group includes a first spacer element disposed between the first lens and the second lens and in partial contact with the image side surface of the first lens, a second spacer element disposed between the second lens and the third lens and in partial 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 partial 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 partial 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 partial contact with the image side surface of the fifth lens. Among them, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 29.00 ≤ T12 / CP1 < 50.00; the effective focal length f1 of the first lens, the maximum axial thickness CP1 of the first spacer element, and the central thickness CT1 of the first lens on the optical axis satisfy: -12.10 < f1 / (CP1 + CT1) < -8.90; the inner diameter d2s of the object side surface of the second spacer element and the inner diameter d1m of the image side surface of the first spacer element satisfy: 0.90 < d2s / d1m < 1.15.

[0081] The optical imaging lens of the present application is composed of a lens barrel and six lenses and spacer elements disposed in the lens barrel. By reasonably arranging the positions of the six lenses, the first spacer element to the fifth spacer element, and setting the optical imaging lens to satisfy that the air gap between the first lens and the second lens at the front end on the optical axis is the largest, there is a large air gap between the first lens and the second lens. When light rays with a large field of view enter the optical imaging lens, in this case, stress concentration or instability is likely to occur in the front-end lens during the assembly process. Therefore, by restricting 29.00 ≤ T12 / CP1 < 50.00, -12.10 < f1 / (CP1 + CT1) < -8.90, and 0.90 < d2s / d1m < 1.15, on the basis of ensuring the transmission space of light rays between the first lens and the second lens, the optical parameters of the first lens at the front end, the size of the first spacer element, and the inner diameter size of the second spacer element can be controlled, ensuring that the first lens, the first spacer element, and the second spacer element can maintain a good stress distribution during the assembly process, avoiding the deformation of the first lens or the generation of welding marks caused by excessive local stress, and at the same time, it is also beneficial to control the edge thickness size of the first lens, improving the balance and assembly accuracy of the optical imaging lens.

[0082] Of course, other parameters in the above embodiments may also be included in this embodiment, which will not be elaborated one by one here.

[0083] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0084] In the optical imaging lens of the present application, multiple lenses may be used, such as the six lenses described above. In the present application, at least one of the lens surfaces of each lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much aberration as possible during imaging, thereby improving the imaging quality.

[0085] 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 may be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0086] Figure 1 A schematic diagram of the size markings of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d1m, d1s, D1s, d2s, d3s, D3s, d4s, D4s, d5m, d0s, d0m, CP1, CP2, EP23, CP3, EP34, CP4, EP45, d3bs, D3bs, and CP4b, SAG12 are marked in it to clearly and intuitively understand the meaning of these parameters. For the convenience of describing the surface shape of the optical imaging lens and specific lenses, these parameters will no longer be shown in the drawings when specific embodiments are described later.

[0087] Next, with reference to the drawings, specific examples of the surface shape and parameters of the optical imaging lens applicable to the above embodiments will be further described.

[0088] It should be noted that in the following First Embodiment, there are three examples of Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in the Second Embodiment, there are three examples of Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in the Third Embodiment, there are three examples of Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3. For the first lens to the sixth lens of the optical imaging lens under the three examples in the same embodiment, parameters such as the curvature radius and central thickness, as well as the spacing distance between the lenses and the high-order term coefficients, are the same. However, parameters such as the lens barrel, the thickness, inner diameter, and outer diameter of each spacer element are different.

[0089] It should be noted that any one of the following First Embodiment to Third Embodiment is applicable to all embodiments of the present application.

[0090] First Embodiment

[0091] As Figures 2 to 6 shown, the optical imaging lens of the First Embodiment is described. Figure 2 The structural schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 3 The structural schematic diagram of the optical imaging lens of Embodiment 1-2 is shown. Figure 4 The structural schematic diagram of the optical imaging lens of Embodiment 1-3 is shown.

[0092] As Figures 2 to 4 shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a third auxiliary spacer element P3b, a fourth lens E4, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth lens E5, a fifth spacer element P5, and a sixth lens E6, which are sequentially arranged in the lens barrel P0 from the object side to the image side.

[0093] As Figure 2As shown in the figure, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-1. In this example, the object side and the image side of the first spacer element P1 are in partial contact with the image side S2 of the first lens and the object side S3 of the second lens respectively. The object side and the image side of the second spacer element P2 are in partial contact with the image side S4 of the second lens and the object side S5 of the third lens respectively. The object side and the image side of the third spacer element P3 are in partial contact with the image side S6 of the third lens and the object side of the third auxiliary spacer element P3b respectively. The image side of the third auxiliary spacer element P3b is in partial contact with the object side S7 of the fourth lens. The object side and the image side of the fourth spacer element P4 are in partial contact with the image side S8 of the fourth lens and the object side of the fourth auxiliary spacer element P4b respectively. The image side of the fourth auxiliary spacer element P4b is in partial contact with the object side S9 of the fifth lens. The object side and the image side of the fifth spacer element P5 are in partial contact with the image side S10 of the fifth lens and the object side S11 of the sixth lens respectively.

[0094] As Figure 3 shown in the figure, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-2. The bearing contact mode of the spacer element in this example is the same as that in Embodiment 1-1. For the relevant description, reference can be made to Embodiment 1-1 and will not be elaborated here.

[0095] As Figure 4 shown in the figure, it is a schematic structural diagram of the optical imaging lens of Embodiment 1-3. The bearing contact mode of the spacer element in this example is the same as that in Embodiment 1-1. For the relevant description, reference can be made to Embodiment 1-1 and will not be elaborated here.

[0096] In summary, the structural parameters of the optical imaging lens in Embodiment 1 under Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3 are shown in Table 2.

[0097] Table 2

[0098]

[0099]

[0100] In Embodiment 1, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The object side S3 of the second lens is concave, and the image side S4 of the second lens is convex. The object side S5 of the third lens is convex, and the image side S6 of the third lens is convex. The object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is convex. The object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is concave.

[0101] In Embodiment 1, half of the maximum field of view (Semi-FOV) of the optical imaging lens is 62.43°, the entrance pupil diameter (EPD) of the optical imaging lens is 1.54 mm, the effective focal length (f) of the optical imaging lens is 1.84 mm, the effective focal length (f1) of the first lens is -3.60 mm, the effective focal length (f2) of the second lens is -16.82 mm, the effective focal length (f3) of the third lens is 3.12 mm, the effective focal length (f4) of the fourth lens is -20.90 mm, the effective focal length (f5) of the fifth lens is 2.14 mm, the effective focal length (f6) of the sixth lens is -3.68 mm, the combined focal length (f45) of the fourth and fifth lenses is 2.13 mm, and the axial distance (SAG12) from the intersection of the image side of the first lens and the optical axis to the vertex of the effective radius of the image side of the first lens is 0.75 mm.

[0102] Table 3 shows the basic structural parameter table of the optical imaging lens in Embodiment 1. Among them, the units of the radius of curvature and the thickness / distance are both 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 stop, and the aperture stop is located between the third lens E3 and the fourth lens E4. S13 and S14 (not shown in the figure) can be the object side and the image side of the filter or the object side and the image side of the protective glass.

[0103] Table 3

[0104]

[0105]

[0106] In Embodiment 1, the object side and the image side of the first lens E1 to the sixth lens E6 are both aspherical surfaces. The surface profiles of the respective aspherical lenses can be defined by, but are not limited to, the following aspherical formula:

[0107]

[0108] where x is the sagitta, the distance from the vertex of the aspherical surface at the position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 3 above; k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 for the surfaces S1 - S12 of the respective aspherical lenses in Embodiment 1.

[0109] Table 4

[0110]

[0111]

[0112] Figure 5 The astigmatism curve of the optical imaging lens of Embodiment 1 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 6 The longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

[0113] According to Figures 5 to 6 it can be known that the optical imaging lens given in Embodiment 1 can achieve good imaging quality.

[0114] Embodiment 2

[0115] As Figures 7 to 11 shown, the optical imaging lens of Embodiment 2 is described. Figure 7 The schematic structural diagram of the optical imaging lens of Embodiment 2-1 is shown, Figure 8 The schematic structural diagram of the optical imaging lens of Embodiment 2-2 is shown, Figure 9 The schematic structural diagram of the optical imaging lens of Embodiment 2-3 is shown.

[0116] As Figures 7 to 9 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 third auxiliary spacer P3b, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth lens E5, a fifth spacer P5, and a sixth lens E6 that are sequentially arranged in the lens barrel P0 from the object side to the image side.

[0117] As Figure 7 shown, it is the schematic structural diagram of the optical imaging lens of Embodiment 2-1. In this example, the object side surface and the image side surface of the first spacer P1 are respectively in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer P2 are respectively in partial contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer P3 are respectively in partial contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer P3b. The image side surface of the third auxiliary spacer P3b is in partial contact with the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer P4 are respectively in partial contact with the image side surface S8 of the fourth lens and the object side surface of the fourth auxiliary spacer P4b. The image side surface of the fourth auxiliary spacer P4b is in partial contact with the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer P5 are respectively in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens.

[0118] As Figure 8As shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 2-2. The bearing contact mode of the spacer element in this example is the same as that in Embodiment 2-1. For the relevant description, reference can be made to Embodiment 2-1, and it will not be elaborated here.

[0119] As Figure 9 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 2-3. The bearing contact mode of the spacer element in this example is the same as that in Embodiment 2-1. For the relevant description, reference can be made to Embodiment 2-1, and it will not be elaborated here.

[0120] In summary, the structural parameters of the optical imaging lens in Embodiment 2 under Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3 are shown in Table 5.

[0121] Table 5

[0122]

[0123]

[0124] In Embodiment 2, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The object side S3 of the second lens is concave, and the image side S4 of the second lens is convex. The object side S5 of the third lens is concave, and the image side S6 of the third lens is convex. The object side S7 of the fourth lens is concave, and the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is convex. The object side S11 of the sixth lens is concave, and the image side S12 of the sixth lens is concave.

[0125] In Embodiment 2, half of the maximum field of view Semi-FOV of the optical imaging lens is 60.27°, the entrance pupil diameter EPD of the optical imaging lens is 1.55 mm, the effective focal length f of the optical imaging lens is 1.85 mm, the effective focal length f1 of the first lens is -3.74 mm, the effective focal length f2 of the second lens is -25.50 mm, the effective focal length f3 of the third lens is 3.53 mm, the effective focal length f4 of the fourth lens is -14.39 mm, the effective focal length f5 of the fifth lens is 1.83 mm, the effective focal length f6 of the sixth lens is -2.84 mm, the combined focal length f45 of the fourth lens and the fifth lens is 1.82 mm, and the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens is 0.70 mm.

[0126] Table 6 shows the basic structural parameter table of the optical imaging lens of Embodiment 2. Among them, the unit of the radius of curvature and the thickness / distance is millimeter (mm). In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located between the third lens E3 and the fourth lens E4. S13 and S14 (not shown in the figure) can be the object side and the image side of the filter or the object side and the image side of the protective glass.

[0127] Table 6

[0128]

[0129]

[0130] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1 - S12 in Embodiment 2. Among them, the surface shape of each aspherical lens is defined according to formula (1) in Embodiment 1.

[0131] Table 7

[0132]

[0133] Figure 10 shows the astigmatism curve of the optical imaging lens of Embodiment 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 11 shows the longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 2, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging lens.

[0134] According to Figures 10 to 11 it can be known that the optical imaging lens given in Embodiment 2 can achieve good imaging quality.

[0135] Embodiment 3

[0136] As Figures 12 to 16 shown, the optical imaging lens of Embodiment 3 is described. Figure 12 shows the structural schematic diagram of the optical imaging lens of Embodiment 3-1, Figure 13 shows the structural schematic diagram of the optical imaging lens of Embodiment 3-2, Figure 14 shows the structural schematic diagram of the optical imaging lens of Embodiment 3-3.

[0137] As Figures 12 to 14As shown in the figure, 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 third auxiliary spacer P3b, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth lens E6, which are sequentially arranged in the lens barrel P0 from the object side to the image side.

[0138] As Figure 12 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-1. In this example, the object side surface and the image side surface of the first spacer P1 are respectively in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer P2 are respectively in partial contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer P3 are respectively in partial contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer P3b. The image side surface of the third auxiliary spacer P3b is in partial contact with the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer P4 are respectively in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer P5 are respectively in partial contact with the image side surface S10 of the fifth lens and the object side surface of the fifth auxiliary spacer P5b. The image side surface of the fifth auxiliary spacer P5b is in partial contact with the object side surface S11 of the sixth lens.

[0139] As Figure 13 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-2. The bearing contact mode of the spacer in this example is the same as that in Embodiment 3-1. For relevant descriptions, reference can be made to those in Embodiment 3-1, and details will not be elaborated here.

[0140] As Figure 14 shown, it is a schematic structural diagram of the optical imaging lens of Embodiment 3-3. The bearing contact mode of the spacer in this example is the same as that in Embodiment 3-1. For relevant descriptions, reference can be made to those in Embodiment 3-1, and details will not be elaborated here.

[0141] In summary, the structural parameters of the optical imaging lens in Embodiment 3 under Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3 are as shown in Table 8.

[0142] Table 8

[0143]

[0144]

[0145] In Embodiment 3, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave.

[0146] In Embodiment 3, half of the maximum field of view of the optical imaging lens, Semi-FOV, is 58.07°, the entrance pupil diameter EPD of the optical imaging lens is 1.62 mm, the effective focal length f of the optical imaging lens is 1.94 mm, the effective focal length f1 of the first lens is -3.43 mm, the effective focal length f2 of the second lens is 10.47 mm, the effective focal length f3 of the third lens is 3.83 mm, the effective focal length f4 of the fourth lens is -3.49 mm, the effective focal length f5 of the fifth lens is 2.05 mm, the effective focal length f6 of the sixth lens is -9.33 mm, the combined focal length f45 of the fourth lens and the fifth lens is 3.61 mm, and the axial distance SAG12 between the intersection point of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens is 0.63 mm.

[0147] Table 9 shows the basic structural parameter table of the optical imaging lens in Embodiment 3. Among them, the unit of the radius of curvature and the thickness / distance is mm. In the following table, OBJ (not shown in the figure) is the object distance. STO (not shown in the figure) is the aperture stop, and the aperture stop is located between the third lens E3 and the fourth lens E4. S13 and S14 (not shown in the figure) can be the object side surface and the image side surface of the filter or the object side surface and the image side surface of the protective glass.

[0148] Table 9

[0149]

[0150]

[0151] Table 10 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1 - S12 in Embodiment 3. Among them, the surface shape of each aspherical lens is defined according to formula (1) in Embodiment 1.

[0152] Table 10

[0153]

[0154] Figure 15The astigmatism curve of the optical imaging lens of Embodiment 3 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 16 The longitudinal chromatic aberration curve of the optical imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens.

[0155] According to Figures 15 to 16 it can be seen that the optical imaging lens given in Embodiment 3 can achieve good imaging quality.

[0156] In summary, Embodiments 1 to 3 respectively satisfy the relationships shown in Table 11.

[0157] Table 11

[0158]

[0159]

[0160] Table 12 shows optical parameters such as half of the maximum field of view Semi-FOV of the optical imaging lenses of Embodiments 1 to 3, the focal lengths f1 to f5 of each lens, and the effective focal length f of the optical imaging lens.

[0161] Table 12

[0162]

[0163]

[0164] This application also provides an optical device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The optical device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The optical device is equipped with the optical imaging lens described above.

[0165] Obviously, the above-described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0166] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to this 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 "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0167] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here.

[0168] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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 is composed of six lenses. The six lenses are, in order from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens. Among them, there is an air gap on the optical axis of the optical imaging lens between adjacent two of the first lens to the sixth lens, and the air gap between the first lens and the second lens on the optical axis is the largest. The spacer element group includes a first spacer element placed between the first lens and the second lens and in partial 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 partial contact with the image side surface of the second lens, a third spacer element placed between the third lens and the fourth lens and in partial contact with the image side surface of the third lens, a fourth spacer element placed between the fourth lens and the fifth lens and in partial 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 partial contact with the image side surface of the fifth lens. Among them, the air gap T12 between the first lens and the second lens on the optical axis and the maximum axial thickness CP1 of the first spacer element satisfy: 29.00 ≤ T12 / CP1 < 50.00; the outer diameter D1s of the object side surface of the first spacer element and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.50 < D1s / EPD < 3.50; the central thickness CT3 of the third lens on the optical axis, the central thickness CT2 of the second lens on the optical axis and the maximum axial thickness CP2 of the second spacer element satisfy: 1.20 < CT3 / (CT2 + CP2) < 4.

90.

2. The optical imaging lens according to claim 1, wherein, The effective focal length f4 of the fourth lens and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -5.10 < f4 / d4s < -1.

00.

3. The optical imaging lens according to claim 1, wherein The effective focal length f5 of the fifth lens and the spacer distance EP45 on the optical axis from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element satisfy: 3.10 < f5 / EP45 < 5.

10.

4. The optical imaging lens according to claim 1, characterized in that, The inner diameter d0s of the object side surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy: 2.70 < d0s / R1 < 3.70; the effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: -4.40 < f1 / R2 < -3.

80.

5. The optical imaging lens according to claim 1, wherein The effective focal length f3 of the third lens, the inner diameter d3s of the object side surface of the third spacer element and the outer diameter D3s of the object side surface of the third spacer element satisfy: 1.85 < f3 / (D3s - d3s) ≤ 3.

60.

6. The optical imaging lens according to claim 1, wherein The maximum axial thickness CP3 of the third spacer element and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 0.70 < CP3 / T34 < 2.

35.

7. The optical imaging lens according to claim 1, wherein The effective focal length f5 of the fifth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 0.87 < f5 / R9 < 1.26; the radius of curvature R10 of the image side surface of the fifth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: -10.62 < R10 / (D4s - d4s) ≤ -0.

75.

8. The optical imaging lens according to claim 1, wherein, The radius of curvature R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacer element satisfy: -2.05 < R3 / d1m < -0.65; the radius of curvature R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer element satisfy: -1.60 < R4 / d2s < -0.

80.

9. The optical imaging lens according to claim 1, wherein, The inner diameter d5m of the image side surface of the fifth spacer element, the central thickness CT6 of the sixth lens on the optical axis, and the refractive index N6 of the sixth lens satisfy: 4.20 ≤ d5m / CT6 / N6 < 6.

20.

10. The optical imaging lens according to claim 1, characterized in that, The outer diameter D1s of the object side surface of the first spacer element, the inner diameter d1s of the object side surface of the first spacer element, and the entrance pupil diameter EPD of the optical imaging lens satisfy: 0.77 < (D1s - d1s) / EPD < 1.82.

Images