Optical imaging lens

Abstract

The present invention provides an optical imaging lens. The optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens group is composed of six lenses, which are, in sequence, a first lens with a negative optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the spacer element group includes a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element; 3.2 < fno × tan(Semi-FOV) < 3.5 is satisfied; 0.5 < CT1 / CT2 < 0.75 is satisfied; -11.5 < (EP12 - f2) / (EP01 - f1) < 2.6 is satisfied. The present invention solves the problem that in the prior art, for a six-piece optical imaging lens, the internal reflection stray light of the front-end lens is serious due to meeting the wide-angle requirement.

Description

Technical Field

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

[0002] With the development of technology, wide-angle lenses have attracted market attention because they can provide a wider field of view. With the advancement of optical design and manufacturing technology, six-element wide-angle lenses not only improve imaging quality and field of view, but also can adapt to various shooting environments. However, when designing six-element wide-angle lenses in the prior art, the size of the front lens is usually controlled, which easily leads to a large difference in the size of the front lens, thereby increasing internal reflected stray light and causing a decrease in edge image quality.

[0003] That is to say, the six-element optical imaging lens in the prior art has the problem of serious stray light reflected within the front lens in order to meet the wide-angle requirement. Summary of the invention

[0004] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the six-lens optical imaging lens in the prior art has serious stray light reflected in the front lens when meeting the wide-angle requirement.

[0005] In order to achieve the above object, according to one aspect of the present invention, an optical imaging lens is provided, which includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens with a negative optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. There is an air gap between two adjacent lenses among the first lens to the sixth lens; 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; the maximum semi-field angle Semi-FOV of the optical imaging lens and the numerical aperture fno of the optical imaging lens satisfy: 3.2 < fno × tan(Semi-FOV) < 3.5; the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 0.5 < CT1 / CT2 < 0.75; the axial distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element, the axial distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -11.5 < (EP12 - f2) / (EP01 - f1) < 2.6.

[0006] 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 with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with an optical power, a fifth lens with an optical power, and a sixth lens with a negative optical power. There is an air gap between two adjacent lenses among the first lens to the sixth lens; 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; the maximum semi-field angle Semi-FOV of the optical imaging lens and the numerical aperture fno of the optical imaging lens satisfy: 3.2 < fno × tan(Semi-FOV) < 3.5; the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 0.5 < CT1 / CT2 < 0.75; the center thickness CP3 of the third spacer element, the center thickness CP4 of the fourth spacer element, the on-axis distance T34 from the image side surface of the third lens to the object side surface of the fourth lens, and the on-axis distance T45 from the image side surface of the fourth lens to the object side surface of the fifth lens satisfy: 0.3 < (T34 + T45) / (CP3 + CP4) < 4.5.

[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 with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with an optical power, a fifth lens with an optical power, and a sixth lens with a negative optical power. There is an air gap between two adjacent lenses among the first lens to the sixth lens; 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; the inner diameter d0m of the image side surface of the lens barrel and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.3 < d0m / EPD < 3.6; the inner diameter d0m of the image side surface of the lens barrel, the inner diameter d5m of the image side surface of the fifth spacer element, and the effective focal length f6 of the sixth lens satisfy: -0.2 < (d0m - d5m) / f6 < 0.1.

[0008] Further, the on-axis distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element, the effective radius DT11 of the object side surface of the first lens, and the effective radius DT12 of the image side surface of the first lens satisfy: 0.75 < (DT11 - DT12) / EP01 < 0.95.

[0009] Further, the maximum axial height L from the object side surface of the lens barrel to the image side surface of the lens barrel and the on-axis distance EP03 from the object side surface of the lens barrel to the object side surface of the third spacer element satisfy: 0.55 < EP03 / L < 0.7.

[0010] Further, 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: 2 < d0s / d0m < 3.2.

[0011] Further, the on-axis distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element and the central thickness CT2 of the second lens satisfy: 1 < EP12 / CT2 < 1.4.

[0012] Further, the center thickness CP3 of the third spacer element, the center thickness CP4 of the fourth spacer element, the on-axis distance T34 from the image side of the third lens to the object side of the fourth lens, and the on-axis distance T45 from the image side of the fourth lens to the object side of the fifth lens satisfy: 0.3 < (T34 + T45) / (CP3 + CP4) < 4.5.

[0013] Further, the on-axis distance EP34 from the image side of the third spacer element to the object side of the fourth spacer element and the on-axis distance EP45 from the image side of the fourth spacer element to the object side of the fifth spacer element satisfy: 0.8 < EP34 / EP45 < 1.4.

[0014] Further, the inner diameter d4s of the object side of the fourth spacer element and the effective focal length f4 of the fourth lens satisfy: -0.7 < d4s / f4 < 1.25; the inner diameter d5s of the object side of the fifth spacer element and the effective focal length f5 of the fifth lens satisfy: -0.65 < d5s / f5 < 1.35.

[0015] Further, the sixth lens has a negative optical power, and the inner diameter d5m of the image side of the fifth spacer element and the effective focal length f6 of the sixth lens satisfy: -3.6 < f6 / d5m < -1.1.

[0016] Further, the inner diameter d4m of the image side of the fourth spacer element and the curvature radius R9 of the object side of the fifth lens satisfy: -2 < d4m / R9 < 1.25; the inner diameter d5s of the object side of the fifth spacer element and the curvature radius R10 of the image side of the fifth lens satisfy: -1.45 ≤ d5s / R10 < -1.2.

[0017] Further, the outer diameter D0m of the image side of the lens barrel, the inner diameter d0m of the image side of the lens barrel, and the effective radius DT62 of the image side of the sixth lens satisfy: 1 < (D0m - d0m) / DT62 ≤ 2.1.

[0018] Further, the maximum axial height L from the object side of the lens barrel to the image side of the lens barrel and the entrance pupil diameter EPD of the optical imaging lens satisfy: 7.7 < L / EPD < 9.5.

[0019] Applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel and six lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably arranging the positions of the six lenses and each spacer element and setting the optical imaging lens to satisfy 3.2 < fno × tan(Semi - FOV) < 3.5 and 0.5 < CT1 / CT2 < 0.75, it is beneficial to achieve the characteristics of wide - angle, ensure that the optical imaging lens can obtain a relatively large field - of - view angle, and at the same time has the characteristics of large aperture. At the same time, the central thickness of the first lens is controlled to be much smaller than the central thickness of the second lens, and the edge thickness of the second lens is relatively thick. When the ultra - wide - angle marginal light enters the second lens after passing through the first lens, internal reflection stray light is likely to be generated at the edge positions of the first lens and the second lens. The increase in stray light leads to a decrease in the edge image quality. Therefore, by restricting - 11.5 < (EP12 - f2) / (EP01 - f1) < 2.6, it is beneficial to ensure that the shapes of the first lens and the second lens are as flat as possible, beneficial to control the edge thicknesses of the first lens and the second lens within a reasonable range, reduce the internal reflection stray light at the front - end lens, and is beneficial to improving the edge image quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 to the present invention. In the drawings:

[0021] Figure 1 Shows the dimension marking diagram of the optical imaging lens of an optional embodiment of the present invention;

[0022] Figure 2 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1 - 1 of the present invention;

[0023] Figure 3 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1 - 2 of the present invention;

[0024] Figure 4 Shows the schematic structural diagram of the optical imaging lens of Embodiment 1 - 3 of the present invention;

[0025] Figures 5 to 7 Respectively show the axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging lens of Embodiment 1 of the present invention;

[0026] Figure 8 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2 - 1 of the present invention;

[0027] Fig. 9 Shows the schematic structural diagram of the optical imaging lens of Embodiment 2 - 2 of the present invention;

[0028] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 2-3 of the present invention is shown;

[0029] Figures 11 to 13 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens of the second embodiment of the present invention are respectively shown;

[0030] Fig.14 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0031] Fig.15 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0032] Fig.16 A schematic structural diagram of an optical imaging lens according to Embodiment 3-3 of the present invention is shown;

[0033] Figures 17 to 19 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging lens of the third embodiment of the present invention are respectively shown;

[0034] Fig. 20 A stray light energy diagram is shown when the optical imaging lens of an optional embodiment of the present invention satisfies fno×tan(Semi-FOV)=3.24, CT1 / CT2=0.51 and (EP12-f2) / (EP01-f1)=-6.10;

[0035] Fig.21 A stray light energy diagram is shown for an optional example of an optical imaging lens satisfying fno×tan(Semi-FOV)=3.24, CT1 / CT2=0.51, and (EP12-f2) / (EP01-f1)=-13;

[0036] Fig. 22 A stray light energy diagram is shown for another optional example of an optical imaging lens that satisfies fno×tan(Semi-FOV)=3.24, CT1 / CT2=0.51, and (EP12-f2) / (EP01-f1)=3.

[0037] The above drawings include the following reference numerals:

[0038] P0, lens barrel; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; P1, first spacing element; P2, second spacing element; P3, third spacing element; P4, fourth spacing element; P5, fifth spacing element. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0041] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0042] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0043] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0044] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in this field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge convexity and concavity. Taking the object side as an example, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; taking the image side as an example, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. In this application, the left side is the object side and the right side is the image side.

[0045] In order to solve the problem that the six-piece optical imaging lens in the prior art has serious internal reflection stray light in the front lens due to meeting the wide-angle requirement, the present invention provides an optical imaging lens.

[0046] As Figures 1 to 22 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 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, a first lens with negative optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. There is an air gap between adjacent two of the first lens to the sixth lens; 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; the maximum semi-field angle Semi-FOV of the optical imaging lens and the numerical aperture fno of the optical imaging lens satisfy: 3.2 < fno × tan(Semi-FOV) < 3.5; the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 0.5 < CT1 / CT2 < 0.75; the on-axis distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element, the on-axis distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element, and the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -11.5 < (EP12 - f2) / (EP01 - f1) < 2.6.

[0047] The optical imaging lens of the present application is composed of a lens barrel, six lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably arranging the positions of the six lenses and each spacer element and setting the optical imaging lens to satisfy 3.2 < fno×tan(Semi-FOV) < 3.5 and 0.5 < CT1 / CT2 < 0.75, it is beneficial to achieve the characteristics of a wide angle, ensure that the optical imaging lens can obtain a large field of view angle, and at the same time has the characteristics of a large aperture. At the same time, the central thickness of the first lens is controlled to be much smaller than the central thickness of the second lens, and the edge thickness of the second lens is relatively thick, so that when the edge light of the ultra-wide angle passes through the first lens and enters the second lens, internal reflection stray light is likely to be generated at the edge positions of the first lens and the second lens. The increase in stray light causes the edge image quality to decline. Therefore, by restricting -11.5 < (EP12 - f2) / (EP01 - f1) < 2.6, it is beneficial to ensure that the shapes of the first lens and the second lens are as flat as possible, beneficial to control the edge thicknesses of the first lens and the second lens within a reasonable range, reduce the internal reflection stray light at the front-end lens, and is beneficial to improving the edge image quality.

[0048] In addition, referring to Table 1 below, Figure 20 to Figure 22 as shown, on the premise that the optical imaging lens satisfies fno×tan(Semi-FOV) = 3.24 and CT1 / CT2 = 0.51, Fig. 20 a stray light energy diagram is shown when the optical imaging lens satisfies (EP12 - f2) / (EP01 - f1) = -6.10, Fig.21 a stray light energy diagram is shown when the optical imaging lens satisfies (EP12 - f2) / (EP01 - f1) = -13, Fig. 22 a stray light energy diagram is shown when the optical imaging lens satisfies (EP12 - f2) / (EP01 - f1) = 3.

[0049] From Figure 20 to Figure 22It can be seen that when (EP12 - f2) / (EP01 - f1) = -6.10, the stray light energy is 0.03, which is within the threshold range, showing better performance and meeting the design requirements. When (EP12 - f2) / (EP01 - f1) = -13, EP01 and EP12 are too small, the stray light energy is 0.08, exceeding the threshold by 0.05, showing poor performance and not meeting the design requirements. When (EP12 - f2) / (EP01 - f1) = 3, EP01 and EP12 are too large, the stray light energy is 0.11, exceeding the threshold by 0.05, showing poor performance and not meeting the design requirements. Thus, it can be seen that when (EP12 - f2) / (EP01 - f1) is in the range of -11.5 to 2.6, the stray light energy of the optical imaging lens is the lowest. Therefore, in this application, by restricting -11.5 < (EP12 - f2) / (EP01 - f1) < 2.6, the shapes of the first lens and the second lens are controlled to be as flat as possible, which is beneficial to controlling the edge thickness of the first lens and the second lens within a reasonable range, reducing the internal reflection stray light at the front lens, reducing the stray light energy, and improving the edge image quality.

[0050] Table 1

[0051] Example 1 Example 2 Example 3 (EP12-f2) / (EP01-f1) -13 -6.10 3 Stray light energy diagram Fig.21 Fig. 20 Fig. 22

[0052] In this embodiment, the following relationship is satisfied among the on-axis distance EP01 from the object side of the lens barrel to the object side of the first spacer element, the effective radius DT11 of the object side of the first lens, and the effective radius DT12 of the image side of the first lens: 0.75 < (DT11 - DT12) / EP01 < 0.95. By controlling EP01 within a reasonable range, the total axial length of the optical imaging lens can be effectively reduced, and at the same time, the situation of the convexity of the object side of the first lens can be avoided; by controlling the effective radius of the first lens within a reasonable range, the forming difficulty of the first lens can be reduced, and the forming stability can be improved; by controlling the relationship between EP01 and the effective radius of the first lens, the size of the large-end of the optical imaging lens can be controlled, which helps to improve the assembly stability of the front end of the optical imaging lens and improve the imaging quality.

[0053] In this embodiment, the following relationship is satisfied between the maximum axial height L from the object side of the lens barrel to the image side of the lens barrel and the on-axis distance EP03 from the object side of the lens barrel to the object side of the third spacer element: 0.55 < EP03 / L < 0.7. By controlling the size ratio of the front end part of the optical imaging lens, the total axial length of the optical imaging lens can be better controlled, and the overall size of the optical imaging lens can be minimized as much as possible; at the same time, by ensuring the ratio of the center thickness and the gap of the first lens and the second lens, the axial air gap between the first lens and the second lens can be effectively controlled within a reasonable range, reducing the field curvature sensitivity and improving the assembly stability.

[0054] In this embodiment, the following condition is satisfied between 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: 2 < d0s / d0m < 3.2. By controlling the ratio of the inner diameter of the object side of the lens barrel to the inner diameter of the image side of the lens barrel, it is possible to ensure that the optical imaging lens has a large light transmission amount, meet the requirements of a large field of view angle, and solve the problem of poor imaging quality in the edge field of view caused by insufficient light; at the same time, it can ensure that the light can be better converged on the imaging surface and improve the imaging quality.

[0055] In this embodiment, the following condition is satisfied between the axial distance EP12 from the image side of the first spacer element to the object side of the second spacer element and the central thickness CT2 of the second lens: 1 < EP12 / CT2 < 1.4. By controlling EP12 and CT2, the forming difficulty of the lens can be controlled. The closer the ratio is to 1, the easier the lens is to form; by controlling the above formula, the thickness uniformity of the second lens can be ensured, the forming difficulty of the second lens can be reduced, the processing yield of the lens can be improved, and the overall cost of the optical imaging lens can be reduced.

[0056] In this embodiment, the following condition is satisfied among the central thickness CP3 of the third spacer element, the central thickness CP4 of the fourth spacer element, the axial distance T34 from the image side of the third lens to the object side of the fourth lens, and the axial distance T45 from the image side of the fourth lens to the object side of the fifth lens: 0.3 < (T34 + T45) / (CP3 + CP4) < 4.5. By controlling the central thickness of the spacer element and the air gap on the optical axis between the third lens and the fourth lens, the profiles of the image side of the third lens and the object side of the fourth lens can be determined. This feature affects the optimization and improvement degree of the internal reflection stray light of the lens. By controlling the relationship between the two through the above formula, the internal reflection stray light of the third lens and the fourth lens can be well controlled, and the imaging quality can be improved.

[0057] In this embodiment, the following condition is satisfied between the axial distance EP34 from the image side of the third spacer element to the object side of the fourth spacer element and the axial distance EP45 from the image side of the fourth spacer element to the object side of the fifth spacer element: 0.8 < EP34 / EP45 < 1.4. By keeping the axial distance from the image side of the third spacer element to the object side of the fourth spacer element and the axial distance from the image side of the fourth spacer element to the object side of the fifth spacer element within a reasonable range, the thickness of the lens and the spacer element can be controlled, ensuring the assembly stability; by the above formula, the edge thickness of the lens and the thickness of the spacer element can be made uniform, which is beneficial to improving the assembly stability.

[0058] In this embodiment, the inner diameter d4s of the object side surface of the fourth spacer element and the effective focal length f4 of the fourth lens satisfy: -0.7 < d4s / f4 < 1.25; the inner diameter d5s of the object side surface of the fifth spacer element and the effective focal length f5 of the fifth lens satisfy: -0.65 < d5s / f5 < 1.35. By controlling these two conditional expressions, it is beneficial to ensure that the inner diameter of the spacer element and the effective focal length of the lens are within a reasonable range, which can improve the lens forming process and ensure the assembly stability; through the above formula, the forming processes of the fourth lens and the fifth lens can be improved, and the assembly stability can be enhanced.

[0059] In this embodiment, the sixth lens has a negative optical power, and the inner diameter d5m of the image side surface of the fifth spacer element and the effective focal length f6 of the sixth lens satisfy: -3.6 < f6 / d5m < -1.1. By controlling the inner diameter of the image side surface of the fifth spacer element and the effective focal length of the sixth lens within a reasonable range, it can be ensured that the fifth spacer element can effectively intercept the stray light passing through the fifth lens without affecting the passage of effective light, minimize the possibility of ineffective light passing through the sixth lens, ensure the imaging quality, and improve the stray light yield of the optical imaging lens.

[0060] In this embodiment, the inner diameter d4m of the image side surface of the fourth spacer element and the curvature radius R9 of the object side surface of the fifth lens satisfy: -2 < d4m / R9 < 1.25; the inner diameter d5s of the object side surface of the fifth spacer element and the curvature radius R10 of the image side surface of the fifth lens satisfy: -1.45 ≤ d5s / R10 < -1.2. By controlling the inner diameter of the spacer element and the curvature radius of the lens within a reasonable range, it can be ensured that the spacer element can intercept stray light as much as possible without affecting the passage of effective light, improving the imaging quality; through the above formula, it can be ensured that the fourth spacer element and the fifth spacer element can effectively intercept stray light and ensure the imaging quality.

[0061] In this embodiment, the outer diameter D0m of the image side surface of the lens barrel, the inner diameter d0m of the image side surface of the lens barrel and the effective radius DT62 of the image side surface of the sixth lens satisfy: 1 < (D0m - d0m) / DT62 ≤ 2.1. Through the above formula, the wall thickness of the image side surface of the lens barrel can be controlled within a reasonable range, reducing the forming difficulty and improving the forming yield of the lens barrel; at the same time, the size of the image side surface of the lens barrel can be controlled within a reasonable range to meet the requirements of module assembly.

[0062] In this embodiment, the maximum axial height L from the object side surface of the lens barrel to the image side surface of the lens barrel and the entrance pupil diameter EPD of the optical imaging lens satisfy: 7.7 < L / EPD < 9.5. By controlling the relationship between the maximum axial height from the object side surface of the lens barrel to the image side surface of the lens barrel and the entrance pupil diameter of the optical imaging lens within a reasonable range, the light passing amount of the first lens can be effectively controlled, the stray light generated by the first lens can be improved, and the stray light yield of the optical imaging lens can be increased.

[0063] In this embodiment, the third lens has a positive optical power. The image side surface of the first lens is concave; the image side surface of the second lens is concave; the image side surface of the third lens is convex; the object side surface of the fourth lens is convex; the image side surface of the fifth lens is convex; the image side surface of the sixth lens is concave. By reasonably restricting the optical power and surface type of each lens, it is beneficial to reasonably restrict the light ray trend, ensure the smooth transition of light rays, is beneficial to correcting aberration, and ensure the imaging quality.

[0064] Optionally, the optical imaging lens in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. During the simulation using software and / or tools such as the above, the surface type of each lens can be appropriately adjusted according to the surface type自带 by the used software and / or the used tool.

[0065] It should be noted that there is an error in the original text of . "自带表面面型" should be something like "built-in surface type". The translation is adjusted according to the corrected understanding.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 with a negative optical power, a second lens with an optical power, a third lens with a positive optical power, a fourth lens with an optical power, a fifth lens with an optical power, and a sixth lens with a negative optical power. There is an air gap between two adjacent lenses among the first lens to the sixth lens; 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; the maximum semi-field angle Semi-FOV of the optical imaging lens and the numerical aperture fno of the optical imaging lens satisfy: 3.2 < fno × tan(Semi-FOV) < 3.5; the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 0.5 < CT1 / CT2 < 0.75; the center thickness CP3 of the third spacer element, the center thickness CP4 of the fourth spacer element, the on-axis distance T34 from the image side surface of the third lens to the object side surface of the fourth lens, and the on-axis distance T45 from the image side surface of the fourth lens to the object side surface of the fifth lens satisfy: 0.3 < (T34 + T45) / (CP3 + CP4) < 4.5.

[0066] The optical imaging lens of the present application consists of a lens barrel and six lenses and multiple spacer elements disposed in the lens barrel. By reasonably arranging the optical powers of the six lenses, the positions of the spacer elements, and setting the optical imaging lens to satisfy 3.2 < fno × tan(Semi-FOV) < 3.5 and 0.5 < CT1 / CT2 < 0.75, it is beneficial to achieve the characteristics of a wide angle, ensure that the optical imaging lens can obtain a relatively large field of view angle, and at the same time has the characteristics of a large aperture. At the same time, the center thickness of the first lens is controlled to be much smaller than the center thickness of the second lens, and the edge thickness of the second lens is relatively thick, so that when the marginal rays of the ultra-wide angle enter the second lens after passing through the first lens, internal reflection stray light is likely to be generated at the edge positions of the first lens and the second lens. The increase in stray light leads to a decrease in the edge image quality. Therefore, the present application restricts 0.3 < (T34 + T45) / (CP3 + CP4) < 4.5. By controlling the center thickness of the spacer element and the air gap between the third lens and the fourth lens on the optical axis, the profiles of the image side of the third lens and the object side of the fourth lens can be determined. This feature affects the optimization and improvement degree of the internal reflection stray light of the lens. Controlling the relationship between the two through the above formula can well control the internal reflection stray light of the third lens and the fourth lens and improve the imaging quality.

[0067] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0068] In addition, in another alternative embodiment of the present application, an optical imaging lens is further provided. 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 six lenses. The six lenses are, in order from the object side to the image side, 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 an optical power, a fifth lens with an optical power, and a sixth lens with a negative optical power. There is an air gap between two adjacent lenses among the first lens to the sixth lens; 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 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 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 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 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 of the fifth lens; the inner diameter d0m of the image side of the lens barrel and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.3 < d0m / EPD < 3.6; the inner diameter d0m of the image side of the lens barrel, the inner diameter d5m of the image side of the fifth spacer element, and the effective focal length f6 of the sixth lens satisfy: -0.2 < (d0m - d5m) / f6 < 0.1.

[0069] The optical imaging lens of the present application is composed of a lens barrel and six lenses and a plurality of spacer elements arranged in the lens barrel. By reasonably arranging the optical powers of the six lenses, the positions of the spacer elements, and setting the optical imaging lens to satisfy 2.3 < d0m / EPD < 3.6 and -0.2 < (d0m - d5m) / f6 < 0.1, it is beneficial to control the inner diameter of the image side of the lens barrel and the inner diameter of the image side of the fifth spacer element on the premise of realizing the wide-angle characteristic and ensuring the light input amount, and to ensure that the fifth spacer element can intercept the stray light at the tail end, thereby ensuring the imaging quality.

[0070] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0071] Optionally, the above optical imaging lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0072] In the optical imaging lens of the present application, multiple lenses can 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 changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0073] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may further include other numbers of lenses.

[0074] Figure 1 A schematic diagram of the dimension marking of an optical imaging lens of the present application is shown. Figure 1 Parameters such as d0s, d4m, d4s, d5s, d5m, d0m, D0m, EP01, EP03, EP12, EP34, EP45, CP3, CP4, and L are marked in it to clearly and intuitively understand the meaning of the parameters. For the convenience of describing the surface type of the optical imaging lens and specific lenses, these parameters will no longer be shown in the drawings when describing specific embodiments later.

[0075] The following further describes, with reference to the drawings, examples of the specific surface type and parameters of the optical imaging lens applicable to the above embodiments.

[0076] It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3; in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3; and in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3. In the three examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distances between lenses of the optical imaging lens are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element to the fifth spacing element are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0077] It should be noted that any one of the following examples 1 to 3 is applicable to all implementation methods of the present application.

[0078] Embodiment 1

[0079] like Figures 2 to 7 As shown, the optical imaging lens of the first embodiment is described. Figure 2 FIG. 1 is a schematic diagram showing the structure of the optical imaging lens of Example 1-1. Figure 3 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-2 is shown, Figure 4 The schematic diagram of the structure of the optical imaging lens of Embodiment 1-3 is shown.

[0080] like Figures 2 to 4 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a third auxiliary spacing element P3b, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a fifth auxiliary spacing element P5b and a sixth lens E6 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0081] like Figure 2, which is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the object side surface and the image side surface of the first spacer element P1 are in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element P2 are in partial contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and the image side surface of the third spacer element P3 are in partial contact with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer element P3b, respectively, and the image side surface of the third auxiliary spacer element 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 element P4 are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and the image side surface of the fifth spacer element P5 are in partial contact with the image side surface S10 of the fifth lens and the object side surface of the fifth auxiliary spacer element P5b, respectively, and the image side surface of the fifth auxiliary spacer element P5b is in partial contact with the object side surface S11 of the sixth lens.

[0082] like Figure 3 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0083] like Figure 4 FIG. 1 is a schematic diagram of the structure of the optical imaging lens of Example 1-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and will not be repeated here.

[0084] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1, Example 1-2, and Example 1-3 are shown in Table 2. (Unit: mm)

[0085] Table 2

[0086] Data / Example 1-1 1-2 1-3 d4s 1.931 1.942 1.965 d4m 1.931 1.942 1.965 d5s 2.256 2.354 2.353 d5m 2.308 2.377 2.414 d0s 5.493 5.393 5.493 d0m 2.633 2.633 1.733 D0m 4.099 4.000 4.095 EP01 1.258 1.240 1.327 EP12 1.623 1.627 1.615 CP3 0.352 0.372 0.333 EP34 0.394 0.376 0.390 CP4 0.018 0.016 0.028 EP45 0.448 0.445 0.423 L 5.760 5.725 5.857 EP03 3.244 3.207 3.333

[0087] In Embodiment 1, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface.

[0088] In Example 1, the effective focal length f1 of the first lens is -1.931 mm, the effective focal length f2 of the second lens is 20.972 mm, the effective focal length f3 of the third lens is 3.590 mm, the effective focal length f4 of the fourth lens is 1.607 mm, the effective focal length f5 of the fifth lens is -3.785 mm, and the effective focal length f6 of the sixth lens is -7.982 mm.

[0089] Table 3 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0090] Table 3

[0091]

[0092]

[0093] In the first embodiment, the object side surface and the image side surface of the first lens E1 to the sixth lens E6 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0094]

[0095] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 4 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-S12 in Example 1.

[0096] Table 4

[0097]

[0098]

[0099] Figure 5 The axial chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Figure 6 The astigmatism curve of the optical imaging lens of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0100] according to Figures 5 to 7 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0101] Embodiment 2

[0102] like Figures 8 to 13 As shown, the optical imaging lens of the second embodiment is described. Figure 8 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-1. Fig. 9 FIG. 2 shows a schematic structural diagram of an optical imaging lens of Example 2-2. Fig.10 A schematic structural diagram of the optical imaging lens of Example 2-3 is shown.

[0103] like Figures 8 to 10 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5 and a sixth lens E6 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0104] like Figure 8 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-1. In this example, the object side surface and image side surface of the first spacer element P1 are in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and image side surface of the second spacer element P2 are in partial contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively. The object side surface and image side surface of the third spacer element P3 are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and image side surface of the fourth spacer element P4 are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and image side surface of the fifth spacer element P5 are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively.

[0105] like Fig. 9 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0106] like Fig.10 FIG. 2 is a schematic diagram of the structure of the optical imaging lens of Example 2-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and will not be repeated here.

[0107] 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)

[0108] Table 5

[0109]

[0110]

[0111] In the second embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a concave surface, and the image side surface S12 of the sixth lens is a concave surface.

[0112] In Example 2, the effective focal length f1 of the first lens is -1.591 mm, the effective focal length f2 of the second lens is -5.613 mm, the effective focal length f3 of the third lens is 1.533 mm, the effective focal length f4 of the fourth lens is 3.692 mm, the effective focal length f5 of the fifth lens is 1.977 mm, and the effective focal length f6 of the sixth lens is -1.709 mm.

[0113] Table 6 shows a basic structural parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0114] Table 6

[0115]

[0116]

[0117] Table 7 below gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A22 that can be used for the aspheric mirror surfaces S1-S12 in Example 2.

[0118] Table 7

[0119] Face number A4 A6 A8 A10 A12 S1 6.2789E-02 -4.8867E-02 2.9838E-02 -1.2274E-02 3.2456E-03 S2 1.0113E-01 -2.7001E-02 -6.9259E-02 2.0378E-01 -2.3110E-01 S3 -2.6467E-01 -1.4330E-01 -5.2572E-01 1.4064E+00 -2.3712E+00 S4 -6.7525E-02 5.3461E-02 -1.1058E-02 -6.2151E-03 3.1421E-02 S5 -1.8253E-15 6.7161E-14 -9.7058E-13 6.9595E-12 -2.6484E-11 S6 1.7961E-01 4.0151E-01 -4.8213E+00 2.8053E+01 -9.5788E+01 S7 -1.3791E-01 5.6677E-02 -3.9872E-01 8.1431E-01 -7.1680E-01 S8 -1.4200E-02 -3.0401E-02 2.7599E-04 1.9052E-02 -1.3202E-02 S9 1.9583E-01 -2.0701E-01 1.9027E-01 -1.1420E-01 3.8424E-02 S10 1.8436E-01 -1.8937E-03 3.8040E-02 -1.2061E-01 1.5982E-01 S11 -4.0061E-01 5.8724E-01 -7.9034E-01 5.8586E-01 -2.0918E-01 S12 -3.3406E-01 4.5318E-01 -4.9614E-01 3.6255E-01 -1.5633E-01 Face number A14 A16 A18 A20 A22 S1 -4.9130E-04 3.2383E-05 2.9360E-08 0.0000E+00 0.0000E+00 S2 1.3765E-01 -4.2373E-02 1.1451E-02 -4.1330E-03 0.0000E+00 S3 2.5898E-02 2.1551E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -4.7979E-02 1.8804E-02 0.0000E+00 0.0000E+00 0.0000E+00 S5 5.1546E-11 -4.0598E-11 0.0000E+00 0.0000E+00 0.0000E+00 S6 2.0479E+02 -2.7633E+02 2.2880E+02 -1.0618E+02 2.1181E+01 S7 3.2744E-01 -6.0475E-02 -2.0297E-03 0.0000E+00 0.0000E+00 S8 3.8876E-03 -4.0344E-04 -7.1214E-06 0.0000E+00 0.0000E+00 S9 -6.1460E-03 2.9529E-04 2.3337E-06 0.0000E+00 0.0000E+00 S10 -1.5659E-01 1.0976E-01 -4.2275E-02 6.7064E-03 0.0000E+00 S11 2.4772E-02 1.8601E-03 0.0000E+00 0.0000E+00 0.0000E+00 S12 3.5411E-02 -3.5112E-03 4.0746E-04 -1.1944E-04 0.0000E+00

[0120] Fig.11 The axial chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig.12 The astigmatism curve of the optical imaging lens of the second embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.13 The distortion curve of the optical imaging lens of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0121] according to Figures 11 to 13It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0122] Embodiment 3

[0123] like Figures 14 to 19 As shown, the optical imaging lens of embodiment 3 is described. Fig.14 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.15 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-2. Fig.16 A schematic structural diagram of the optical imaging lens of Example 3-3 is shown.

[0124] like Figures 14 to 16 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a second auxiliary spacing element P2b, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5 and a sixth lens E6 which are sequentially arranged in the lens barrel P0 from the object side to the image side along the optical axis.

[0125] like Fig.14 , which is a schematic diagram of the structure of the optical imaging lens of Example 3-1. In this example, the object side surface and the image side surface of the first spacer element P1 are in partial contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively. The object side surface and the image side surface of the second spacer element P2 are in partial contact with the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, respectively, and the image side surface of the second auxiliary spacer element P2b is in partial contact with the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer element P3 are in partial contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively. The object side surface and the image side surface of the fourth spacer element P4 are in partial contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively. The object side surface and the image side surface of the fifth spacer element P5 are in partial contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens, respectively.

[0126] like Fig.15 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0127] like Fig.16 FIG. 3 is a schematic diagram of the structure of the optical imaging lens of Example 3-3. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0128] 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)

[0129] Table 8

[0130] Data / Example 3-1 3-2 3-3 d4s 2.042 2.042 2.021 d4m 2.042 2.042 2.021 d5s 1.996 2.035 2.044 d5m 1.996 2.035 2.044 d0s 4.941 5.041 5.141 d0m 2.291 2.441 2.490 D0m 3.528 3.575 3.696 EP01 1.252 1.272 1.240 EP12 0.829 0.811 0.829 CP3 0.018 0.016 0.022 EP34 0.754 0.785 0.751 CP4 0.018 0.016 0.022 EP45 0.576 0.574 0.553 L 5.481 5.562 5.530 EP03 3.270 3.252 3.714

[0131] In the third embodiment, the object side surface S1 of the first lens is a concave surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a convex surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a concave surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a convex surface. The object side surface S11 of the sixth lens is a convex surface, and the image side surface S12 of the sixth lens is a concave surface.

[0132] In Example 3, the effective focal length f1 of the first lens is -1.801 mm, the effective focal length f2 of the second lens is 35.548 mm, the effective focal length f3 of the third lens is 1.889 mm, the effective focal length f4 of the fourth lens is -2.995 mm, the effective focal length f5 of the fifth lens is 1.562 mm, and the effective focal length f6 of the sixth lens is -3.726 mm.

[0133] Table 9 shows a basic structural parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters.

[0134] Table 9

[0135]

[0136] Table 10 below lists the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for the aspheric mirror surfaces S1-S12 in Example 3.

[0137] Table 10

[0138]

[0139]

[0140] Fig.17 The axial chromatic aberration curve of the optical imaging lens of the third embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig.18 The astigmatism curve of the optical imaging lens of the third embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.19The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0141] according to Figures 17 to 19 It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0142] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship shown in Table 11.

[0143] Table 11

[0144] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 fno×tan(Semi-FOV) 3.24 3.24 3.24 3.39 3.39 3.39 3.44 3.44 3.44 CT1 / CT2 0.51 0.51 0.51 0.71 0.71 0.71 0.62 0.62 0.62 (EP12-f2) / (EP01-f1) -6.07 -6.10 -5.94 2.51 2.55 2.50 -11.37 -11.30 -11.42 (DT11-DT12) / EP01 0.82 0.84 0.78 0.90 0.92 0.88 0.87 0.85 0.87 EP03 / L 0.56 0.56 0.57 0.62 0.61 0.61 0.60 0.58 0.67 d0s / d0m 2.09 2.05 3.17 2.77 2.71 2.63 2.16 2.07 2.06 EP12 / CT2 1.35 1.36 1.35 1.16 1.20 1.20 1.02 1.00 1.02 (T34+T45) / (CP3+CP4) 0.37 0.36 0.38 1.67 1.88 1.36 3.84 4.32 3.14 EP34 / EP45 0.88 0.84 0.92 0.90 0.90 0.90 1.31 1.37 1.36 d4s / f4 1.20 1.21 1.22 0.38 0.39 0.38 -0.68 -0.68 -0.67 d5s / f5 -0.60 -0.62 -0.62 0.72 0.72 0.73 1.28 1.30 1.31 f6 / d5m -3.46 -3.36 -3.31 -1.20 -1.20 -1.18 -1.87 -1.83 -1.82 d4m / R9 -1.95 -1.96 -1.99 0.12 0.13 0.12 1.22 1.22 1.21 d5s / R10 -1.27 -1.33 -1.32 -1.21 -1.21 -1.23 -1.41 -1.44 -1.45 (D0m-d0m) / DT62 1.31 1.22 2.10 1.85 1.88 1.88 1.19 1.09 1.16 L / EPD 7.83 7.78 7.96 9.02 9.13 9.41 7.75 7.87 7.82 d0m / EPD 3.58 3.58 2.35 3.27 3.41 3.59 3.24 3.45 3.52 (d0m-d5m) / f6 -0.04 -0.03 0.09 -0.10 -0.14 -0.18 -0.08 -0.11 -0.12

[0145] Table 12 shows the effective focal lengths of the lenses of the optical imaging lenses of Examples 1 to 3.

[0146] Table 12

[0147]

[0148]

[0149] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0150] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0151] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0152] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0153] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: It includes a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of six lenses. The six lenses are, in order from the object side to the image side, a first lens with negative optical power, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. There is an air gap between two adjacent lenses among the first lens to the sixth lens. 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. The maximum semi-field angle Semi-FOV of the optical imaging lens and the numerical aperture fno of the optical imaging lens satisfy: 3.2 < fno × tan(Semi-FOV) < 3.5; the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 0.5 < CT1 / CT2 < 0.75; the axial distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element, the axial distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -11.5 < (EP12 - f2) / (EP01 - f1) < 2.

6.

2. The optical imaging lens according to claim 1, wherein: The axial distance EP01 from the object side surface of the lens barrel to the object side surface of the first spacer element, the effective radius DT11 of the object side surface of the first lens and the effective radius DT12 of the image side surface of the first lens satisfy: 0.75 < (DT11 - DT12) / EP01 < 0.

95.

3. The optical imaging lens according to claim 1, wherein: The maximum axial height L from the object side surface of the lens barrel to the image side surface of the lens barrel and the axial distance EP03 from the object side surface of the lens barrel to the object side surface of the third spacer element satisfy: 0.55 < EP03 / L < 0.

7.

4. The optical imaging lens according to claim 1, wherein: 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: 2 < d0s / d0m < 3.

2.

5. The optical imaging lens according to claim 1, wherein: The axial distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element and the center thickness CT2 of the second lens satisfy: 1 < EP12 / CT2 < 1.

4.

6. The optical imaging lens according to claim 1, wherein: The following condition is satisfied among the central thickness CP3 of the third spacer element, the central thickness CP4 of the fourth spacer element, the on-axis distance T34 from the image side of the third lens to the object side of the fourth lens, and the on-axis distance T45 from the image side of the fourth lens to the object side of the fifth lens: 0.3 < (T34 + T45) / (CP3 + CP4) < 4.

5.

7. The optical imaging lens according to claim 1, wherein: The following condition is satisfied between the on-axis distance EP34 from the image side of the third spacer element to the object side of the fourth spacer element and the on-axis distance EP45 from the image side of the fourth spacer element to the object side of the fifth spacer element: 0.8 < EP34 / EP45 < 1.

4.

8. The optical imaging lens according to claim 1, wherein: The following conditions are satisfied respectively: between the inner diameter d4s of the object side of the fourth spacer element and the effective focal length f4 of the fourth lens: -0.7 < d4s / f4 < 1.25; between the inner diameter d5s of the object side of the fifth spacer element and the effective focal length f5 of the fifth lens: -0.65 < d5s / f5 < 1.

35.

9. The optical imaging lens according to claim 1, wherein: The sixth lens has a negative optical power, and the following condition is satisfied between the inner diameter d5m of the image side of the fifth spacer element and the effective focal length f6 of the sixth lens: -3.6 < f6 / d5m < -1.

1.

10. The optical imaging lens according to claim 1, wherein: The following conditions are satisfied respectively: between the inner diameter d4m of the image side of the fourth spacer element and the curvature radius R9 of the object side of the fifth lens: -2 < d4m / R9 < 1.25; between the inner diameter d5s of the object side of the fifth spacer element and the curvature radius R10 of the image side of the fifth lens: -1.45 ≤ d5s / R10 < -1.

2.

11. The optical imaging lens according to claim 1, wherein: The following condition is satisfied among the outer diameter D0m of the image side of the lens barrel, the inner diameter d0m of the image side of the lens barrel, and the effective radius DT62 of the image side of the sixth lens: 1 < (D0m - d0m) / DT62 ≤ 2.

1.

12. The optical imaging lens according to claim 1, wherein: The following condition is satisfied between the maximum axial height L from the object side of the lens barrel to the image side of the lens barrel and the entrance pupil diameter EPD of the optical imaging lens: 7.7 < L / EPD < 9.5.

Images