Optical imaging lens

Abstract

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of seven lenses, and the seven lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side; the at least one spacer comprises a second spacer and a third spacer; f3 / EP23 is more than or equal to-18.12 and less than or equal to-15.67; r6 / d3s is greater than or equal to 2.17 and less than or equal to 3.09. The problem that in the prior art, a seven-piece optical imaging lens meets the requirement for small size, and consequently middle stray light is increased is solved.

Description

Technical Field

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

[0002] With the continuous development of science and technology, portable electronic products such as mobile phones and tablets have become indispensable tools in people's lives. Optical imaging lenses are an indispensable part of portable electronic products. In order to adapt to these electronic products, while ensuring the imaging quality, optical imaging lenses are gradually developing in the direction of miniaturization and lightness.

[0003] At present, seven-element optical imaging lenses are relatively common. Existing seven-element optical imaging lenses usually compress the thickness and size of the middle structure to achieve overall size compression to meet the small size requirement. However, in this case, the edge part of the middle structure is prone to generate more stray light, which in turn affects the imaging quality.

[0004] That is to say, the seven-element optical imaging lens in the prior art has the problem of increasing intermediate stray light due to the small size. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical imaging lens to solve the problem that the seven-element optical imaging lens in the prior art has a small size which leads to an increase in intermediate stray light.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group and at least one spacer arranged in the lens barrel, the lens group consisting of seven lenses, and the seven 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, a sixth lens and a seventh lens in order; the at least one spacer comprises a second spacer placed between the second lens and the third lens and in contact with the image side portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side portion of the third lens; the effective focal length f3 of the third lens and the axial spacing EP23 between the second spacer and the third spacer satisfy the following: -18.12≤f3 / EP23≤-15.67; the curvature radius R6 of the image side surface of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy the following: 2.17≤R6 / d3s≤3.09.

[0007] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group arranged in the lens barrel, and at least one spacer, wherein the lens group is composed of seven lenses, and the seven 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, a sixth lens, and a seventh lens; the first lens has positive focal power, the second lens has positive focal power, the third lens has negative focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, and the seventh lens has negative focal power; the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the image side surface of the third lens is concave; the object side surface of the fourth lens is convex, and the image side surface is concave surface; the object side surface of the fifth lens is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is concave; at least one spacer includes a second spacer placed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens; the effective focal length f3 of the third lens and the axial spacing EP23 between the second spacer and the third spacer satisfy: -18.12≤f3 / EP23≤-15.67; the curvature radius R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer satisfy: 5.77≤R4 / d2s≤7.66.

[0008] According to another aspect of the present invention, an optical imaging lens is provided, comprising a lens barrel, a lens group arranged in the lens barrel, and at least one spacer, wherein the lens group consists of seven lenses, and the seven 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, a sixth lens, and a seventh lens; the first lens has positive focal power, the second lens has positive focal power, the third lens has negative focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, and the seventh lens has negative focal power; the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the image side surface of the third lens is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is concave , the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is concave; at least one spacer includes a second spacer placed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens; the center thickness CT3 of the third lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 0.28≤CT3 / (T23+T34)≤0.35; the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy: -3.79≤f3 / d3s≤-3.39.

[0009] Furthermore, at least one spacer also includes a first spacer placed between the first lens and the second lens and partially in contact with the image side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacer and the inner diameter d1s of the object side surface of the first spacer satisfy: 1.89≤R2×N1 / (D1s-d1s)≤2.67.

[0010] Furthermore, at least one spacer also includes a first spacer placed between the first lens and the second lens and partially in contact with the image side surface of the first lens, and the effective focal length f1 of the first lens and the axial spacing EP01 between the object side end surface of the lens barrel and the first spacer satisfy: 6.00≤f1 / EP01≤6.63.

[0011] Furthermore, at least one spacer also includes a first spacer placed between the first lens and the second lens and partially in contact with the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens, the refractive index N2 of the second lens, the outer diameter D1m of the image side surface of the first spacer and the inner diameter d1m of the image side surface of the first spacer satisfy: 1.60≤R3×N2 / (D1m-d1m)≤2.05.

[0012] Further, a curvature radius R4 of the image-side surface of the second lens and an inner diameter d2s of the object-side surface of the second spacer satisfy: 5.77≤R4 / d2s≤7.66.

[0013] Furthermore, at least one spacer also includes a first spacer placed between the first lens and the second lens and partially in contact with the image side surface of the first lens, and the effective focal length f2 of the second lens and the axial spacing EP12 between the first spacer and the second spacer satisfy: 32.29≤f2 / EP12≤35.52.

[0014] Further, a central thickness CT3 of the third lens on the optical axis, a maximum axial thickness CP3 of the third spacer, and an air interval T23 between the second lens and the third lens on the optical axis satisfy: 2.83≤(CT3+CP3) / T23≤4.98.

[0015] Further, a curvature radius R7 of the object-side surface of the fourth lens and an outer diameter D3m of the image-side surface of the third spacer satisfy: 2.20≤R7 / D3m≤9.70.

[0016] Further, at least one spacer also includes a fourth spacer placed between the fourth lens and the fifth lens and partially in contact with the image side surface of the fourth lens, and the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer and the inner diameter d4s of the object side surface of the fourth spacer satisfy: 2.28≤R8 / (D4s-d4s)≤4.80.

[0017] Further, at least one spacer also includes a fourth spacer placed between the fourth lens and the fifth lens and partially in contact with the image side surface of the fourth lens, and the curvature radius R9 of the object side surface of the fifth lens and the inner diameter d4m of the image side surface of the fourth spacer satisfy: -2.47≤R9 / d4m≤-1.54.

[0018] Furthermore, the at least one spacer also includes a fifth spacer placed between the fifth lens and the sixth lens and partially in contact with the image side surface of the fifth lens, and the outer diameter D5s of the object side surface of the fifth spacer and the curvature radius R10 of the image side surface of the fifth lens satisfy: -3.18≤D5s / R10≤-2.00.

[0019] Further, at least one spacer also includes a fifth spacer placed between the fifth lens and the sixth lens and in contact with the image side portion of the fifth lens, and a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side portion of the sixth lens. The curvature radius R11 of the object side of the sixth lens and the curvature radius R12 of the image side of the sixth lens satisfy: -2.58≤R12 / R11≤-0.29; the center thickness CT6 of the sixth lens on the optical axis, the maximum axial thickness CP5 of the fifth spacer, and the axial spacing EP56 between the fifth spacer and the sixth spacer satisfy: 1.50≤(CP5+EP56) / CT6≤3.11.

[0020] Furthermore, the at least one spacer also includes a sixth spacer placed between the sixth lens and the seventh lens and partially in contact with the image side surface of the sixth lens, and the inner diameter d6m of the image side surface of the sixth spacer and the curvature radius R13 of the object side surface of the seventh lens satisfy: 2.51≤d6m / R13≤3.21.

[0021] Furthermore, the first lens has positive optical power, the object side surface of the first lens is convex, and the image side surface is concave; the third lens has negative optical power, and the image side surface of the third lens is concave; the sixth lens has negative optical power, the object side surface of the sixth lens is concave, and the image side surface is concave; the seventh lens has negative optical power, the object side surface of the seventh lens is convex, and the image side surface is concave.

[0022] Furthermore, the second lens has positive optical power, the object side surface of the second lens is convex, and the image side surface is concave; the fourth lens has negative optical power, the object side surface of the fourth lens is convex, and the image side surface is concave; the fifth lens has positive optical power, the object side surface of the fifth lens is concave, and the image side surface is convex.

[0023] By applying the technical solution of the present invention, the optical imaging lens of the present application is composed of a lens barrel, seven lenses arranged in the lens barrel, and a plurality of spacers. By reasonably arranging the positions of the seven lenses, the second spacer, and the third spacer, and setting the optical imaging lens to meet -18.12≤f3 / EP23≤-15.67, by controlling the ratio of the focal length of the third lens to the axial spacing between the second spacer and the third spacer, it is beneficial to control the effective focal length of the third lens not to be too large, and at the same time constrain the edge thickness of the third lens to be within a smaller range, which is beneficial to compress the size of the intermediate structure, so that the intermediate structure of the optical imaging lens is arranged more compactly, which is beneficial to meet the requirements of miniaturization. However, when controlling the effective focal length and edge thickness of the third lens, more ineffective light will be incident on the edge parts of the second lens and the third lens, thereby generating stray light. Therefore, the present application can effectively reduce the stray light caused by light other than the effective light by constraining 2.17≤R6 / d3s≤3.09, ensure that the third spacer can effectively intercept the stray light, thereby improving the imaging quality. Controlling the curvature radius of the image side of the third lens can adjust the refraction angle of the system light, which helps to improve the illumination of the edge field of view and improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 A dimensioning diagram of an optical imaging lens according to an optional embodiment of the present invention is shown;

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

[0027] Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 1-2 of the present invention is shown;

[0028] Figures 4 to 6 The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens of the first embodiment of the present invention are respectively shown;

[0029] Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 2-1 of the present invention is shown;

[0030] Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 2-2 of the present invention is shown;

[0031] Figures 9 to 11The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens of the second embodiment of the present invention are respectively shown;

[0032] Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 3-1 of the present invention is shown;

[0033] Fig.13 A schematic structural diagram of an optical imaging lens according to Embodiment 3-2 of the present invention is shown;

[0034] Figures 14 to 16 The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens of the third embodiment of the present invention are respectively shown;

[0035] Fig.17 A schematic structural diagram of an optical imaging lens according to Embodiment 4-1 of the present invention is shown;

[0036] Fig.18 A schematic structural diagram of an optical imaging lens according to Embodiment 4-2 of the present invention is shown;

[0037] Figures 19 to 21 The axial chromatic aberration curve, the astigmatism curve and the magnification chromatic aberration curve of the optical imaging lens of the fourth embodiment of the present invention are respectively shown;

[0038] Fig. 22 and Fig.23 An optical path diagram and a stray light energy diagram of an optional example optical imaging lens are respectively shown when 18.11≤f3 / EP23≤-15.67 and R6 / d3s=1.9;

[0039] Fig.24 and Fig.25 An optical path diagram and a stray light energy diagram of an optional example optical imaging lens are respectively shown when 18.11≤f3 / EP23≤-15.67 and R6 / d3s=2.1;

[0040] Fig.26 and Fig. 27 An optical path diagram and a stray light energy diagram of an optional example optical imaging lens are respectively shown when 18.11≤f3 / EP23≤-15.67 and R6 / d3s=2.28 are satisfied;

[0041] Fig.28 and Fig.29 An optical path diagram and a stray light energy diagram of an optional example optical imaging lens are respectively shown when 18.11≤f3 / EP23≤-15.67 and R6 / d3s=3.09 are satisfied;

[0042] Fig.30 and Fig.31An optical path diagram and a stray light energy diagram of an optional example optical imaging lens satisfying 18.11≤f3 / EP23≤-15.67 and R6 / d3s=3.3 are respectively shown.

[0043] The above drawings include the following reference numerals:

[0044] P0, lens barrel; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; E7, seventh lens; S13, object-side surface of the seventh lens; S14, image-side surface of the seventh lens; P1, first spacer; P2, second spacer; P3, third spacer; P4, fourth spacer; P5, fifth spacer; P6, sixth spacer. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be based on the judgment method of the general knowledge in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface. 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 that a seven-lens optical imaging lens in the prior art has a small size which results in an increase in intermediate stray light, the present invention provides an optical imaging lens.

[0052] like Figures 1 to 31 As shown, in an optional embodiment of the present application, the optical imaging lens includes a lens barrel and a lens group and at least one spacer arranged in the lens barrel, the lens group consists of seven lenses, and the seven 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, a sixth lens and a seventh lens; the at least one spacer includes a second spacer placed between the second lens and the third lens and in contact with the image side portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side portion of the third lens; the effective focal length f3 of the third lens and the axial spacing EP23 between the second spacer and the third spacer satisfy: -18.12≤f3 / EP23≤-15.67; the curvature radius R6 of the image side surface of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy: 2.17≤R6 / d3s≤3.09.

[0053] The optical imaging lens of the present application is composed of a lens barrel, seven lenses arranged in the lens barrel, and a plurality of spacers. By reasonably arranging the positions of the seven lenses, the second spacer, and the third spacer, and setting the optical imaging lens to meet -18.12≤f3 / EP23≤-15.67, by controlling the ratio of the focal length of the third lens to the axial spacing between the second spacer and the third spacer, it is beneficial to control the effective focal length of the third lens not to be too large, and at the same time constrain the edge thickness of the third lens to be within a smaller range, which is beneficial to compress the size of the intermediate structure, so that the intermediate structure of the optical imaging lens is arranged more compactly, which is beneficial to meet the requirements of miniaturization. However, when the effective focal length and edge thickness of the third lens are controlled, more ineffective light will be incident on the edge portions of the second lens and the third lens, thereby generating stray light. Therefore, the present application can effectively reduce the stray light caused by light other than the effective light by constraining 2.17≤R6 / d3s≤3.09, ensure that the third spacer can effectively intercept the stray light, thereby improving the imaging quality. Controlling the curvature radius of the image side of the third lens can adjust the refraction angle of the system light, which helps to improve the illumination of the edge field of view and improve the imaging quality.

[0054] In addition, refer to the following table 1, Figures 22 to 31 As shown, under the premise that the optical imaging lens satisfies -18.12≤f3 / EP23≤-15.67, for example, f3 / EP23=-15.67 or f3 / EP23=-17.70. Fig. 22 and Fig.23 The optical path diagram and stray light energy diagram are respectively shown when the optical imaging lens satisfies R6 / d3s=1.9. Fig.24 and Fig.25 The optical path diagram and stray light energy diagram are respectively shown when the optical imaging lens satisfies R6 / d3s=2.1. Fig.26 and Fig. 27 The optical path diagram and stray light energy diagram are respectively shown when the optical imaging lens satisfies R6 / d3s=2.28. Fig.28 and Fig.29 The optical path diagram and stray light energy diagram are respectively shown when the optical imaging lens satisfies R6 / d3s=3.09. Fig.30 and Fig.31 The optical path diagram and stray light energy diagram are respectively shown when the optical imaging lens satisfies R6 / d3s=3.3.

[0055] Depend on Figures 22 to 31It can be seen that when -18.12≤f3 / EP23≤-15.67, R6 / d3s=1.9 and R6 / d3s=2.1 are satisfied, the intermediate structure causes an increase in stray light, the stray light energy is stronger, and the performance is poor. When -18.12≤f3 / EP23≤-15.67 and R6 / d3s=2.28 are satisfied, the stray light energy is weakened, the stray light is improved, and the performance is better. When -18.12≤f3 / EP23≤-15.67 and R6 / d3s=3.3 are satisfied, the intermediate structure causes more stray light, the stray light energy is stronger, and the performance is poor. When -18.12≤f3 / EP23≤-15.67 and R6 / d3s=3.09, the stray light is improved compared to when -18.12≤f3 / EP23≤-15.67 and R6 / d3s=3.3. It can be seen that when -18.12≤f3 / EP23≤-15.67 is satisfied and R6 / d3s is in the range of 2.17 to 3.09, the stray light improvement effect of the optical imaging lens is the best, and the smaller the value of R6 / d3s is than the lower limit of this application, the stronger the stray light energy; the larger the value of R6 / d3s is than the upper limit of this application, the stronger the stray light energy. Therefore, the present application reasonably constrains the ratio range of the radius of curvature of the image side surface of the third lens to the inner diameter of the object side surface of the third spacer by constraining 2.17≤R6 / d3s≤3.09, which can effectively reduce the stray light caused by light other than the effective light, and ensure that the third spacer can effectively intercept the stray light, thereby improving the imaging quality. Controlling the radius of curvature of the image side surface of the third lens can adjust the refraction angle of the system light, which helps to improve the illumination of the edge field of view and improve the imaging quality.

[0056] Table 1

[0057]

[0058] In this embodiment, at least one spacer also includes a first spacer placed between the first lens and the second lens and in contact with the image side portion of the first lens, a fourth spacer placed between the fourth lens and the fifth lens and in contact with the image side portion of the fourth lens, a fifth spacer placed between the fifth lens and the sixth lens and in contact with the image side portion of the fifth lens, and a sixth spacer placed between the sixth lens and the seventh lens and in contact with the image side portion of the sixth lens.

[0059] In this embodiment, the curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacer, and the inner diameter d1s of the object side surface of the first spacer satisfy the following relationship: 1.89≤R2×N1 / (D1s-d1s)≤2.67. By controlling the curvature radius of the image side surface of the first lens, the refraction angle of the light beam in the first lens can be effectively controlled, which is beneficial to reducing the rear end size of the optical imaging lens. By controlling the inner diameter of the object side surface of the first spacer, the light path of the main light of the optical system in the second lens can be effectively controlled, which is beneficial to improving the imaging quality of the optical imaging lens.

[0060] In this embodiment, the effective focal length f1 of the first lens and the axial spacing EP01 between the object side end surface of the lens barrel and the first spacer satisfy: 6.00≤f1 / EP01≤6.63. By controlling this conditional expression, the optical power of the first lens in the optical system can be effectively distributed, and the chromatic aberration of the optical imaging lens can be balanced under the premise of ensuring the illumination of the edge field of view.

[0061] In this embodiment, the curvature radius R3 of the object side surface of the second lens, the refractive index N2 of the second lens, the outer diameter D1m of the image side surface of the first spacer, and the inner diameter d1m of the image side surface of the first spacer satisfy: 1.60≤R3×N2 / (D1m-d1m)≤2.05. By controlling this conditional expression, the deformation problem of the spacer after corrosion extinction can be effectively avoided, and the thickness of the second lens can be effectively controlled to ensure that the air gap between the second lens and the front and rear lenses is within a certain range, which is conducive to reducing the difficulty of molding the second lens.

[0062] In this embodiment, the curvature radius R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer satisfy: 5.77≤R4 / d2s≤7.66. Controlling this conditional expression is conducive to reducing the sensitivity of the optical system and ensuring that the second lens has good processability. At the same time, controlling the inner diameter of the object side surface of the second spacer can effectively block the stray light generated by the reflection of the light outside the field of view at the rear edge mechanism part, which is conducive to improving the clarity of the large image plane and improving the picture quality.

[0063] In this embodiment, the effective focal length f2 of the second lens and the axial interval EP12 between the first spacer and the second spacer satisfy: 32.29≤f2 / EP12≤35.52. Controlling this conditional expression is conducive to reasonably allocating the focal length proportion of the second lens, which is conducive to better balancing aberrations of the optical imaging lens, and is also conducive to improving the resolution of the system.

[0064] In this embodiment, the central thickness CT3 of the third lens on the optical axis, the maximum axial thickness CP3 of the third spacer, and the air interval T23 between the second lens and the third lens on the optical axis satisfy: 2.83≤(CT3+CP3) / T23≤4.98. By controlling the central thickness of the third lens, it is beneficial to reduce the thickness ratio of the third lens, avoid the appearance and stray light problems caused by its excessive value, and effectively improve the comprehensive yield of the optical imaging lens. At the same time, by controlling the thickness of the third spacer, the field curvature can be adjusted by adjusting the thickness of the spacer, the resolution can be improved, and the imaging quality of the optical imaging lens can be improved.

[0065] In this embodiment, the curvature radius R7 of the object side surface of the fourth lens and the outer diameter D3m of the image side surface of the third spacer satisfy: 2.20≤R7 / D3m≤9.70. By controlling the ratio range, the refraction angle of the system light beam at the fourth lens can be effectively controlled, and the chromatic aberration of the optical imaging lens can be balanced under the premise of ensuring the illumination of the edge field of view. By constraining the outer diameter of the image side surface of the third spacer by the ratio range, the assembly stability can be ensured while controlling the outer diameter.

[0066] In this embodiment, the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer, and the inner diameter d4s of the object side surface of the fourth spacer satisfy the following relationship: 2.28≤R8 / (D4s-d4s)≤4.80. By controlling the curvature radius of the image side surface of the fourth lens, the light angle of the edge field of view can be controlled within a reasonable range, which can reduce the sensitivity of the system. At the same time, by controlling the inner and outer diameters of the fourth spacer, it can be ensured that the fourth spacer can effectively block stray light other than effective light, thereby improving the imaging quality.

[0067] In this embodiment, the curvature radius R9 of the object side surface of the fifth lens and the inner diameter d4m of the image side surface of the fourth spacer satisfy: -2.47≤R9 / d4m≤-1.54. By controlling the ratio range, it is beneficial to control the inner diameter of the image side surface of the fourth spacer, ensuring that the fourth spacer can effectively block the invalid light reflected in the edge structure part of the fifth lens, reducing the possibility of stray light generation.

[0068] In this embodiment, the outer diameter D5s of the object side surface of the fifth spacer and the curvature radius R10 of the image side surface of the fifth lens satisfy: -3.18≤D5s / R10≤-2.00. By reasonably controlling the ratio range of the outer diameter of the fifth spacer and the curvature radius of the image side surface of the fifth lens, it is helpful to reduce the angle between the main light and the optical axis when it is incident on the imaging surface, which is helpful to improve the illumination of the imaging surface.

[0069] In this embodiment, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -2.58≤R12 / R11≤-0.29; the center thickness CT6 of the sixth lens on the optical axis, the maximum axial thickness CP5 of the fifth spacer, and the axial interval EP56 between the fifth spacer and the sixth spacer satisfy: 1.50≤(CP5+EP56) / CT6≤3.11. By controlling R12 / R11 within this range, the optical power of the sixth lens in the optical system can be effectively distributed, and the aberration of the optical system can be balanced. At the same time, the position distribution of the fifth lens and the sixth lens is controlled, and the fifth spacer and the axial interval between the fifth spacer and the sixth spacer are reasonably constrained, which can effectively reduce the assembly sensitivity and improve the stability of the optical imaging lens under high temperature and high humidity.

[0070] In this embodiment, the inner diameter d6m of the image side surface of the sixth spacer and the curvature radius R13 of the object side surface of the seventh lens satisfy: 2.51≤d6m / R13≤3.21. This relationship is helpful for controlling the inner diameter of the image side surface of the sixth spacer, reducing the incident angle of light and improving the illumination of the imaging surface.

[0071] In this embodiment, the first lens has positive focal power, the object side surface of the first lens is convex, and the image side surface is concave; the third lens has negative focal power, and the image side surface of the third lens is concave; the sixth lens has negative focal power, the object side surface of the sixth lens is concave, and the image side surface is concave; the seventh lens has negative focal power, the object side surface of the seventh lens is convex, and the image side surface is concave. By constraining the focal power and surface shape of the key first lens, third lens, sixth lens, and seventh lens, it is helpful to control the incident angle and the exit angle of the light, and it is also helpful to plan the light trend, ensure the smooth transition of the light, and it is also helpful to balance the front and rear aberrations, improve distortion, and ensure the imaging quality.

[0072] In this embodiment, the second lens has positive power, the object side surface of the second lens is convex, and the image side surface is concave; the fourth lens has negative power, the object side surface of the fourth lens is convex, and the image side surface is concave; the fifth lens has positive power, the object side surface of the fifth lens is concave, and the image side surface is convex. By constraining the power and surface shape of the second lens, the fourth lens, and the fifth lens in the middle, it is helpful to regulate the light trend, so that the positive and negative aberrations before and after offset each other, and ensure the imaging quality.

[0073] 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.

[0074] In addition, in another optional embodiment of the present application, an optical imaging lens is also provided, including a lens barrel, a lens group and at least one spacer arranged in the lens barrel, the lens group is composed of seven lenses, and the seven 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, a sixth lens and a seventh lens; the first lens has positive focal power, the second lens has positive focal power, the third lens has negative focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, and the seventh lens has negative focal power; the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the image side surface of the third lens is concave; the object side surface of the fourth lens is convex, The image side surface is concave; the object side surface of the fifth lens is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is concave; at least one spacer includes a second spacer placed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens; the effective focal length f3 of the third lens and the axial spacing EP23 between the second spacer and the third spacer satisfy: -18.12≤f3 / EP23≤-15.67; the curvature radius R4 of the image side surface of the second lens and the inner diameter d2s of the object side surface of the second spacer satisfy: 5.77≤R4 / d2s≤7.66.

[0075] The optical imaging lens of the present application is composed of a lens barrel, seven lenses arranged in the lens barrel, and a plurality of spacers. By reasonably arranging the positions of the seven lenses, the second spacer, and the third spacer, and setting the optical imaging lens to meet -18.12≤f3 / EP23≤-15.67, by controlling the ratio of the focal length of the third lens to the axial spacing between the second spacer and the third spacer, it is beneficial to control the effective focal length of the third lens not to be too large, and at the same time constrain the edge thickness of the third lens to be within a smaller range, which is beneficial to compress the size of the intermediate structure, so that the intermediate structure of the optical imaging lens is arranged more compactly, which is beneficial to meet the requirements of miniaturization. However, when the effective focal length and edge thickness of the third lens are controlled, more ineffective light will be incident on the edge portions of the second lens and the third lens, thereby generating stray light. Therefore, the present application, by constraining 5.77≤R4 / d2s≤7.66, is beneficial to reducing the sensitivity of the optical system and ensuring that the second lens has good manufacturability. At the same time, the inner diameter of the object side of the second spacer is controlled, which can effectively block the stray light generated by the reflection of the light outside the field of view at the rear edge mechanism, which is beneficial to improving the clarity of the large image plane and improving the picture quality.

[0076] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0077] In addition, in another optional embodiment of the present application, an optical imaging lens is also provided, including a lens barrel, a lens group and at least one spacer arranged in the lens barrel, the lens group is composed of seven lenses, and the seven 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, a sixth lens and a seventh lens; the first lens has positive focal power, the second lens has positive focal power, the third lens has negative focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, the sixth lens has negative focal power, and the seventh lens has negative focal power; the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the image side surface of the third lens is concave; the object side surface of the fourth lens is convex, and the image side surface is concave; the object side surface of the fifth lens is convex, and the image side surface is concave The side surface is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is concave; at least one spacer includes a second spacer placed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and a third spacer placed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens; the center thickness CT3 of the third lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 0.28≤CT3 / (T23+T34)≤0.35; the effective focal length f3 of the third lens and the inner diameter d3s of the object side surface of the third spacer satisfy: -3.79≤f3 / d3s≤-3.39.

[0078] The optical imaging lens of the present application is composed of a lens barrel, seven lenses arranged in the lens barrel, and a plurality of spacers. By reasonably arranging the positions of the seven lenses, the second spacer, and the third spacer, and setting the optical imaging lens 0.28≤CT3 / (T23+T34)≤0.35 and -3.79≤f3 / d3s≤-3.39, the intermediate structure interval is compressed to make the overall structure more compact. Under the premise of meeting miniaturization, by controlling the ratio range between the effective focal length of the third lens and the inner diameter of the object side surface of the third spacer, the inner diameter of the object side surface of the third spacer is in a reasonable range, thereby ensuring that the third spacer can block and intercept more edge stray light, thereby optimizing the imaging quality.

[0079] Of course, this embodiment may also include other parameter formulas in the above embodiment, which will not be described one by one here.

[0080] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0081] The optical imaging lens in the present application may use multiple lenses, such as the seven lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0082] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0083] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1 Parameters such as D5s, D4s, D1s, d4s, d3s, d1s, d2s, d1m, D1m, D3m, d4m, d6m, CP3, CP5, EP01, EP12, EP23, and EP56 are indicated in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the description of the optical imaging lens and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0084] The following further describes examples of specific surface shapes and parameters of the optical imaging lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0085] It should be noted that in the following embodiment 1, there are two examples of embodiment 1-1 and embodiment 1-2, in embodiment 2, there are two examples of embodiment 2-1 and embodiment 2-2, in embodiment 3, there are two examples of embodiment 3-1 and embodiment 3-2, and in embodiment 4, there are two examples of embodiment 4-1 and embodiment 4-2. In the two examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and the spacing distance between lenses and the coefficient of high-order terms of the optical imaging lens are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel and the first to sixth spacers are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0086] It should be noted that any one of the following embodiments 1 to 4 is applicable to all implementation methods of the present application.

[0087] Embodiment 1

[0088] like Figures 2 to 6 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 structural diagram of the optical imaging lens of Embodiment 1-2 is shown.

[0089] like Figure 2 and Figure 3 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, and a seventh lens E7, which are arranged in sequence from the object side to the image side in the lens barrel P0.

[0090] like Figure 2 As shown, it is a schematic diagram of the structure of the optical imaging lens of Example 1-1. In this example, the image side of the sixth spacer P6 is also provided with a sixth auxiliary spacer. The object side and image side of the first spacer 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 image side of the second spacer 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 image side of the third spacer P3 are in partial contact with the image side S6 of the third lens and the object side S7 of the fourth lens, respectively. The object side and image side of the fourth spacer P4 are in partial contact with the image side S8 of the fourth lens and the object side S9 of the fifth lens, respectively. The object side and image side of the fifth spacer P5 are in partial contact with the image side S10 of the fifth lens and the object side S11 of the sixth lens, respectively. The object side and image side of the sixth spacer P6 are in partial contact with the image side S12 of the sixth lens and the object side of the sixth auxiliary spacer, respectively, and the image side of the sixth auxiliary spacer is in partial contact with the object side S13 of the seventh lens.

[0091] like Figure 3 , which is a schematic diagram of the structure of the optical imaging lens of Example 1-2. The difference between this example and Example 1-1 is that a fifth auxiliary spacer is also provided on the image side of the fifth spacer P5. At this time, the image side of the fifth spacer P5 is in partial contact with the object side of the fifth auxiliary spacer, and the image side of the fifth auxiliary spacer is in partial contact with the object side S11 of the sixth lens. The supporting and abutting manner of the remaining spacers is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and no further description is given here.

[0092] In summary, the structural parameters of the optical imaging lens of Example 1 in Example 1-1 and Example 1-2 are shown in Table 2.

[0093] Table 2

[0094]

[0095]

[0096] In Embodiment 1, 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 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 convex surface, and the image side surface S6 of the third lens is a concave 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 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 concave surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface.

[0097] In Example 1, the effective focal length f1 of the first lens is 5.76 mm, the effective focal length f2 of the second lens is 8.59 mm, the effective focal length f3 of the third lens is -7.99 mm, the effective focal length f4 of the fourth lens is -16.07 mm, the effective focal length f5 of the fifth lens is 6.22 mm, the effective focal length f6 of the sixth lens is -166.13 mm, and the effective focal length f7 of the seventh lens is -7.84 mm.

[0098] 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.

[0099] Table 3

[0100]

[0101]

[0102] In Embodiment 1, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0103]

[0104] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 1; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface S1-S14 in Example 1.

[0105] Table 4

[0106]

[0107]

[0108] Figure 4 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 5 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 6 The magnification chromatic aberration curve of the optical imaging lens of the first embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0109] according to Figures 4 to 6 It can be seen that the optical imaging lens provided in the first embodiment can achieve good imaging quality.

[0110] Embodiment 2

[0111] like Figures 7 to 11 As shown, the optical imaging lens of the second embodiment is described. Figure 7 A schematic diagram of the structure of the optical imaging lens of Example 2-1 is shown. Figure 8 A schematic structural diagram of the optical imaging lens of Example 2-2 is shown.

[0112] like Figure 7 and Figure 8 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, and a seventh lens E7, which are arranged in sequence from the object side to the image side in the lens barrel P0.

[0113] like Figure 7, 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 the image side surface of the first spacer 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 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 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 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 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. The object side surface and the image side surface of the sixth spacer P6 are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively.

[0114] like Figure 8 , which is a schematic diagram of the structure of the optical imaging lens of Example 2-2. The difference between this example and Example 2-1 is that a fourth auxiliary spacer is also provided on the image side of the fourth spacer P4. At this time, the image side surface of the fourth spacer P4 is partially in contact with the object side surface of the fourth auxiliary spacer, and the image side surface of the fourth auxiliary spacer is partially in contact with the object side surface S9 of the fifth lens. The supporting and abutting manner of the remaining spacers is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and no further description is given here.

[0115] In summary, the structural parameters of the optical imaging lens of Example 2 in Example 2-1 and Example 2-2 are shown in Table 5.

[0116] Table 5

[0117]

[0118]

[0119] 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 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 convex surface, and the image side surface S6 of the third lens is a concave 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 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 concave surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface.

[0120] In Example 2, the effective focal length f1 of the first lens is 5.77 mm, the effective focal length f2 of the second lens is 8.87 mm, the effective focal length f3 of the third lens is -7.81 mm, the effective focal length f4 of the fourth lens is -21.46 mm, the effective focal length f5 of the fifth lens is 7.28 mm, the effective focal length f6 of the sixth lens is -117.96 mm, and the effective focal length f7 of the seventh lens is -9.67 mm.

[0121] 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.

[0122] Table 6

[0123]

[0124]

[0125] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces S1-S14 in Example 2.

[0126] Table 7

[0127] Face number A4 A6 A8 A10 A12 A14 A16 S1 6.3451E-03 1.6105E-03 1.6790E-04 -2.8633E-05 -2.5881E-05 -7.0221E-06 -1.8432E-06 S2 1.8045E-02 7.5378E-03 -1.7290E-03 -4.7005E-04 -1.6297E-04 -1.0955E-05 4.3837E-06 S3 -7.1595E-03 1.1756E-02 -1.0466E-03 -3.5010E-04 -1.6161E-04 -1.0213E-05 1.0838E-05 S4 -2.0281E-02 6.3023E-03 -7.1332E-04 -1.4149E-04 -2.5268E-04 -2.7891E-05 3.1185E-05 S5 4.2963E-04 -1.8869E-04 -1.0784E-03 -4.2522E-05 -2.5613E-04 -8.9757E-06 2.1392E-05 S6 3.8932E-02 1.7220E-03 3.7658E-04 2.0054E-04 -7.0891E-05 3.2222E-06 1.6003E-06 S7 -2.5079E-01 -7.8090E-03 2.4624E-03 2.0760E-03 2.5317E-04 -1.3625E-04 -1.5746E-04 S8 -4.1864E-01 1.4220E-02 9.9893E-03 2.2273E-03 -7.8566E-04 -3.7141E-04 -3.6468E-04 S9 -1.5242E-01 9.0873E-02 -1.1634E-02 -5.8468E-03 1.1815E-03 6.9097E-04 -1.0626E-03 S10 -2.3879E-01 1.5185E-01 -2.2454E-02 -1.5143E-03 2.3136E-03 3.3128E-04 -1.8808E-03 S11 -2.2243E-01 -1.3190E-01 2.0906E-02 -7.9232E-03 1.3075E-02 8.0098E-05 -8.0119E-04 S12 -3.0028E-01 4.1148E-02 4.6963E-04 -9.5223E-03 8.0093E-03 -5.7558E-03 1.5255E-03 S13 -3.1661E+00 1.0262E+00 -2.7356E-01 3.6135E-02 4.0948E-03 4.5032E-04 -4.5917E-03 S14 -6.5997E+00 1.4623E+00 -4.5625E-01 1.5570E-01 -5.3384E-02 2.8292E-02 -1.4588E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 7.1403E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 2.1748E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 3.6118E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.7395E-05 6.0780E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.1705E-05 4.0946E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 7.6757E-07 8.1749E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -4.2704E-05 -1.5258E-05 3.4847E-06 1.6422E-06 4.1666E-07 -1.0851E-06 0.0000E+00 S8 -8.9340E-05 3.3317E-06 6.4777E-06 1.5409E-05 -3.3849E-06 1.4783E-06 -1.4600E-06 S9 2.3758E-04 7.6459E-05 -1.2830E-04 2.9548E-05 -2.2813E-06 -3.0435E-06 -4.4971E-06 S10 5.5750E-04 1.9972E-04 -2.2618E-04 4.2890E-05 1.9370E-05 -3.0142E-06 -4.9400E-06 S11 7.7089E-04 6.6529E-05 -3.5902E-04 3.2854E-05 -1.6685E-04 -2.4583E-05 -1.3638E-05 S12 1.7391E-03 -1.6616E-03 1.2944E-04 5.3712E-04 -4.1641E-04 1.2624E-04 -7.7070E-06 S13 2.3751E-03 1.7923E-03 -2.4724E-03 6.6514E-04 4.0912E-04 -3.3979E-04 8.4575E-05 S14 3.8398E-03 -7.5362E-05 -6.2129E-04 3.9972E-04 -7.8175E-07 1.7011E-04 -1.0003E-04

[0128] Fig. 9 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.10 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.11 The magnification chromatic aberration curve of the optical imaging lens of the second embodiment is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0129] according to Figures 9 to 11 It can be seen that the optical imaging lens provided in the second embodiment can achieve good imaging quality.

[0130] Embodiment 3

[0131] like Figures 12 to 16 As shown, the optical imaging lens of embodiment 3 is described. Fig.12 FIG. 3 is a schematic diagram showing the structure of the optical imaging lens of Example 3-1. Fig.13 A schematic structural diagram of the optical imaging lens of Example 3-2 is shown.

[0132] like Fig.12 and Fig.13As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, and a seventh lens E7, which are arranged in sequence from the object side to the image side in the lens barrel P0.

[0133] like Fig.12 , 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 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 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 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 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 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. The object side surface and the image side surface of the sixth spacer P6 are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively.

[0134] like Fig.13 The figure is a schematic diagram of the structure of the optical imaging lens of Example 3-2. The difference between this example and Example 3-1 is that a fourth auxiliary spacer is also provided on the image side of the fourth spacer P4. At this time, the image side surface of the fourth spacer P4 is in partial contact with the object side surface of the fourth auxiliary spacer, and the image side surface of the fourth auxiliary spacer is in partial contact with the object side surface S9 of the fifth lens. The supporting and abutting manner of the remaining spacers is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and no further description is given here.

[0135] In summary, the structural parameters of the optical imaging lens of Example 3 in Example 3-1 and Example 3-2 are shown in Table 8.

[0136] Table 8

[0137]

[0138]

[0139] In Embodiment 3, 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 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 concave 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 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 concave surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface.

[0140] In Example 3, the effective focal length f1 of the first lens is 6.16 mm, the effective focal length f2 of the second lens is 7.61 mm, the effective focal length f3 of the third lens is -8.87 mm, the effective focal length f4 of the fourth lens is -20.69 mm, the effective focal length f5 of the fifth lens is 8.86 mm, the effective focal length f6 of the sixth lens is -100.31 mm, and the effective focal length f7 of the seventh lens is -9.34 mm.

[0141] 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.

[0142] Table 9

[0143]

[0144] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces S1-S14 in Example 3.

[0145] Table 10

[0146]

[0147]

[0148] Fig.14 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.15 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.16 The magnification chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0149] according to Figures 14 to 16It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0150] Embodiment 4

[0151] like Figures 17 to 21 As shown, the optical imaging lens of Example 4 is described. Fig.17 FIG. 4 is a schematic diagram showing the structure of the optical imaging lens of Example 4-1. Fig.18 A schematic structural diagram of the optical imaging lens of Example 4-2 is shown.

[0152] like Fig.17 and Fig.18 As shown, the optical imaging lens includes a lens barrel P0 and a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, and a seventh lens E7, which are arranged in sequence from the object side to the image side in the lens barrel P0.

[0153] like Fig.17 , which is a schematic diagram of the structure of the optical imaging lens of Example 4-1. In this example, the object side surface and the image side surface of the first spacer 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 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 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 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 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. The object side surface and the image side surface of the sixth spacer P6 are in partial contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens, respectively.

[0154] like Fig.18 , which is a schematic diagram of the structure of the optical imaging lens of Example 4-2. The difference between this example and Example 4-1 is that a fourth auxiliary spacer is also provided on the image side of the fourth spacer P4. At this time, the image side surface of the fourth spacer P4 is partially in contact with the object side surface of the fourth auxiliary spacer, and the image side surface of the fourth auxiliary spacer is partially in contact with the object side surface S9 of the fifth lens. The supporting and abutting manner of the remaining spacers is the same as that of Example 4-1, and the relevant description in Example 4-1 may be referred to, and no further description is given here.

[0155] In summary, the structural parameters of the optical imaging lens of Example 4 in Example 4-1 and Example 4-2 are shown in Table 11.

[0156] Table 11

[0157] Parameters / Examples 4-1 4-2 d1s(mm) 2.336 2.336 d1m(mm) 2.336 2.336 D1s(mm) 5.570 5.003 d2s(mm) 2.300 2.300 d3s(mm) 2.326 2.326 D3m(mm) 5.770 5.203 d4s(mm) 3.103 2.913 D4s(mm) 5.870 5.303 d4m(mm) 3.103 2.913 D5s(mm) 7.080 6.729 d6m(mm) 5.821 5.821 CP3(mm) 0.022 0.022 CP5(mm) 0.022 0.022 EP01(mm) 0.990 0.990 EP12(mm) 0.225 0.221 EP23(mm) 0.441 0.441 EP56(mm) 0.583 0.583

[0158] In Embodiment 4, 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 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 convex surface, and the image side surface S6 of the third lens is a concave 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 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 concave surface, and the image side surface S12 of the sixth lens is a concave surface. The object side surface S13 of the seventh lens is a convex surface, and the image side surface S14 of the seventh lens is a concave surface.

[0159] In Example 4, the effective focal length f1 of the first lens is 5.94 mm, the effective focal length f2 of the second lens is 7.85 mm, the effective focal length f3 of the third lens is -7.89 mm, the effective focal length f4 of the fourth lens is -15.76 mm, the effective focal length f5 of the fifth lens is 6.84 mm, the effective focal length f6 of the sixth lens is -139.48 mm, and the effective focal length f7 of the seventh lens is -9.37 mm.

[0160] Table 12 shows a basic structural parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0161] Table 12

[0162]

[0163] Table 13 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces S1-S14 in Example 4.

[0164] Table 13

[0165]

[0166]

[0167] Fig.19 The axial chromatic aberration curve of the optical imaging lens of the fourth embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens. Fig. 20 The astigmatism curve of the optical imaging lens of Example 4 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.21The magnification chromatic aberration curve of the optical imaging lens of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens.

[0168] according to Figures 19 to 21 It can be seen that the optical imaging lens provided in the fourth embodiment can achieve good imaging quality.

[0169] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 14.

[0170] Table 14

[0171]

[0172]

[0173] Table 15 shows the effective focal lengths of the lenses of the optical imaging lenses of Examples 1 to 4.

[0174] Table 15

[0175] Parameters / Examples one two three Four f1(mm) 5.76 5.77 6.16 5.94 f2(mm) 8.59 8.87 7.61 7.85 f3(mm) -7.99 -7.81 -8.87 -7.89 f4(mm) -16.07 -21.46 -20.69 -15.76 f5(mm) 6.22 7.28 8.86 6.84 f6(mm) -166.13 -117.96 -100.31 -139.48 f7(mm) -7.84 -9.67 -9.34 -9.37

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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: comprising a lens barrel, a lens group and at least one spacer disposed in the lens barrel, The lens group is composed of seven lenses, and the seven 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, a sixth lens and a seventh lens; The at least one spacer includes a second spacer disposed between the second lens and the third lens and in contact with the image side surface portion of the second lens, and a third spacer disposed between the third lens and the fourth lens and in contact with the image side surface portion of the third lens; The effective focal length f3 of the third lens and the axial distance between the second spacer and the third spacer EP23 satisfies: -18.12≤f3 / EP23≤-15.67; A curvature radius R6 of the image-side surface of the third lens and an inner diameter d3s of the object-side surface of the third spacer satisfy the following: 2.17≤R6 / d3s≤3.

09.

2. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a first spacer disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens, The curvature radius R2 of the image side surface of the first lens, the refractive index N1 of the first lens, the outer diameter D1s of the object side surface of the first spacer, and the inner diameter d1s of the object side surface of the first spacer satisfy: 1.89≤R2×N1 / (D1s-d1s)≤2.

67.

3. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a first spacer disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens, The effective focal length f1 of the first lens and the axial distance EP01 between the object-side end surface of the lens barrel and the first spacer satisfy the following: 6.00≤f1 / EP01≤6.

63.

4. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a first spacer disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens, The curvature radius R3 of the object side surface of the second lens, the refractive index N2 of the second lens, the outer diameter D1m of the image side surface of the first spacer and the inner diameter d1m of the image side surface of the first spacer satisfy: 1.60≤R3×N2 / (D1m-d1m)≤2.

05.

5. The optical imaging lens according to claim 1, wherein: A curvature radius R4 of the image-side surface of the second lens and an inner diameter d2s of the object-side surface of the second spacer satisfy the following: 5.77≤R4 / d2s≤7.

66.

6. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a first spacer disposed between the first lens and the second lens and in contact with the image side surface portion of the first lens, The effective focal length f2 of the second lens and the axial interval EP12 between the first spacer and the second spacer satisfy the following: 32.29≤f2 / EP12≤35.

52.

7. The optical imaging lens according to claim 1, wherein: A center thickness CT3 of the third lens on the optical axis, a maximum axial thickness CP3 of the third spacer, and an air interval T23 between the second lens and the third lens on the optical axis satisfy the following: 2.83≤(CT3+CP3) / T23≤4.

98.

8. The optical imaging lens according to claim 1, wherein: A curvature radius R7 of the object-side surface of the fourth lens and an outer diameter D3m of the image-side surface of the third spacer satisfy the following: 2.20≤R7 / D3m≤9.

70.

9. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface portion of the fourth lens, A curvature radius R8 of the image side surface of the fourth lens, an outer diameter D4s of the object side surface of the fourth spacer, and an inner diameter d4s of the object side surface of the fourth spacer satisfy the following: 2.28≤R8 / (D4s-d4s)≤4.

80.

10. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a fourth spacer disposed between the fourth lens and the fifth lens and in contact with the image side surface portion of the fourth lens, A curvature radius R9 of the object-side surface of the fifth lens and an inner diameter d4m of the image-side surface of the fourth spacer satisfy the following: -2.47≤R9 / d4m≤-1.

54.

11. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image side surface portion of the fifth lens, An outer diameter D5s of the object-side surface of the fifth spacer and a curvature radius R10 of the image-side surface of the fifth lens satisfy the following relationship: -3.18≤D5s / R10≤-2.

00.

12. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a fifth spacer disposed between the fifth lens and the sixth lens and in contact with the image side surface portion of the fifth lens, and a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image side surface portion of the sixth lens. A curvature radius R11 of the object side surface of the sixth lens and a curvature radius R12 of the image side surface of the sixth lens satisfy: -2.58≤R12 / R11≤-0.29; a center thickness CT6 of the sixth lens on the optical axis, a maximum axial thickness CP5 of the fifth spacer, and an axial interval EP56 between the fifth spacer and the sixth spacer satisfy: 1.50≤(CP5+EP56) / CT6≤3.

11.

13. The optical imaging lens according to claim 1, wherein: The at least one spacer further includes a sixth spacer disposed between the sixth lens and the seventh lens and in contact with the image side surface portion of the sixth lens, An inner diameter d6m of the image-side surface of the sixth spacer and a curvature radius R13 of the object-side surface of the seventh lens satisfy the following relationship: 2.51≤d6m / R13≤3.

21.

14. The optical imaging lens according to any one of claims 1 to 13, characterized in that: The first lens has positive optical power, the object side surface of the first lens is convex, and the image side surface is concave; the third lens has negative optical power, and the image side surface of the third lens is concave; the sixth lens has negative optical power, the object side surface of the sixth lens is concave, and the image side surface is concave; the seventh lens has negative optical power, the object side surface of the seventh lens is convex, and the image side surface is concave.

15. The optical imaging lens according to any one of claims 1 to 13, characterized in that: The second lens has positive optical power, the object side surface of the second lens is convex, and the image side surface is concave; the fourth lens has negative optical power, the object side surface of the fourth lens is convex, and the image side surface is concave; the fifth lens has positive optical power, the object side surface of the fifth lens is concave, and the image side surface is convex.

Images