Optical imaging lens

Abstract

The invention provides an optical imaging lens, the optical imaging lens has seven lenses with focal power, the optical imaging lens comprises a lens group, a spacing element group and a lens barrel, the curvature radius R12 of the image side surface of a sixth lens and the outer diameter D6s of the object side surface of a sixth spacing element satisfy the following conditions:-2.72 < = R12 / D6s < =-1.15; and the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacing element and the inner diameter d6m of the image side surface of the sixth spacing element meet the condition that R13 / (D6m-d6m) is more than or equal to 10.25 and less than or equal to 11.08. The problem that the rear end of an optical imaging lens in the prior art generates serious aberration 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 development of smart phones, the optical imaging lenses of mobile phone lenses need to maintain imaging quality while being miniaturized and thin. The number of lenses in an optical imaging lens has a key impact on imaging quality, but increasing the number of lenses in a limited space will reduce the degree of design freedom, especially the shape of the rear lens of a seven-piece optical imaging lens needs to take into account both processability and bearing stability, which further increases the difficulty of design. However, in the process of controlling the shape of the rear lens, it is easy to cause the sixth and seventh lenses to have poor constraints on light, and the final imaging field curvature and stray light are more serious. Therefore, how to control the shape of the rear lens of the optical imaging lens and the inner and outer diameter dimensions of the spacing element to improve the imaging quality while ensuring the processability and bearing stability of the rear lens is a very important issue. Summary of the invention

[0003] The main purpose of the present invention is to provide an optical imaging lens to solve the problem of serious aberration at the rear end of the optical imaging lens in the prior art.

[0004] In order to achieve the above-mentioned object, the present invention provides an optical imaging lens, wherein the number of lenses with optical power of the optical imaging lens is seven, and the optical imaging lens comprises: a lens group, wherein the lens group comprises a first lens to a seventh lens arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group comprises at least a sixth spacer element located between a sixth lens and a seventh lens and at least partially in contact with the image side surface of the sixth lens; a lens barrel, wherein the lens group and the spacer element group are accommodated in the lens barrel; wherein the curvature radius R12 of the image side surface of the sixth lens and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: -2.72≤R12 / D6s≤-1.15; and the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 10.25≤R13 / (D6m-d6m)≤11.08.

[0005] According to another aspect of the present invention, an optical imaging lens is provided, wherein the number of lenses having optical power of the optical imaging lens is seven, and the optical imaging lens comprises: a lens group, wherein the lens group comprises a first lens to a seventh lens arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group comprises at least a sixth spacer element located between a sixth lens and a seventh lens and at least partially in contact with the image side surface of the sixth lens; and a lens barrel, wherein the lens group and the spacer element group are accommodated in the lens barrel; wherein the spacer element group further comprises a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, and a spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. The second spacing element, the air spacing T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air spacing T23 between the second lens and the third lens on the optical axis, and the spacing EP12 between the first spacing element and the second spacing element along the optical axis satisfy the following: 1.21≤(T12+T23) / EP12≤1.96; the spacing element group also includes a second spacing element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacing element satisfy the following: -104.78≤f2 / (CT2+CP2)≤-68.8.

[0006] Furthermore, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens and the interval EP34 between the third spacer element and the fourth spacer element along the optical axis of the optical imaging lens satisfy: 11.97≤f4 / EP34≤36.67.

[0007] Furthermore, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and the air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens and the maximum thickness CP3 of the third spacer element satisfy: 2.54≤T34 / CP3≤4.63.

[0008] Furthermore, the spacer element group also includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, and the effective focal length f1 of the first lens, the interval EP01 between the object side end surface of the lens barrel and the first spacer element along the optical axis of the optical imaging lens, and the center thickness CT1 of the first lens on the optical axis satisfy: 3.08≤f1 / (EP01+CT1)≤3.7.

[0009] Furthermore, the spacer element group also includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, and a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the gap EP12 between the first spacer element and the second spacer element along the optical axis satisfy the following: 1.21≤(T12+T23) / EP12≤1.96.

[0010] Furthermore, the spacer element group also includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy: -104.78≤f2 / (CT2+CP2)≤-68.8.

[0011] Furthermore, the spacer element group also includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The effective focal length f3 of the third lens and the interval EP23 between the second spacer element and the third spacer element along the direction of the optical axis of the optical imaging lens satisfy: -44.2≤f3 / EP23≤-27.5.

[0012] Furthermore, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and 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 element satisfy: 1.69≤R6 / d3s≤4.31.

[0013] Furthermore, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and the outer diameter D3m of the image side surface of the third spacer element and the curvature radius R7 of the object side surface of the fourth lens satisfy: 2.84≤R7 / D3m≤4.92.

[0014] Furthermore, the spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least 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 and the outer diameter D4s of the object side surface of the fourth spacer element satisfy: -2.1≤R8 / D4s≤-0.71.

[0015] Furthermore, the spacer element group also includes a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and the outer diameter D5m of the image side surface of the fifth spacer element, the inner diameter d5m of the image side surface of the fifth spacer element, and the curvature radius R11 of the object side surface of the sixth lens satisfy: 1.54≤(D5m-d5m) / R11≤1.76.

[0016] Furthermore, the spacer element group also includes a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis of the optical imaging lens and the gap EP56 between the fifth spacer element and the sixth spacer element along the optical axis satisfy: 2.57≤EP56 / T56≤4.92.

[0017] Further, the first lens has positive focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave, the second lens has negative focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave, the third lens has negative focal power, and the image side surface of the third lens is concave, the fourth lens has positive focal power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex, the fifth lens has negative focal power, and the image side surface of the fifth lens is concave, the sixth lens has positive focal power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex, the seventh lens has negative focal power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave.

[0018] According to the technical solution of the present invention, the optical imaging lens has seven lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel. The lens group includes a first lens to a seventh lens arranged in sequence from the object side to the image side of the optical imaging lens; the spacer element group includes at least a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; the lens group and the spacer element group are accommodated in the lens barrel; wherein the curvature radius R12 of the image side surface of the sixth lens and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: -2.72≤R12 / D6s≤-1.15; the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 10.25≤R13 / (D6m-d6m)≤11.08.

[0019] The optical imaging lens of the present application uses seven lenses with optical focal length, and the first lens to the seventh lens are arranged in sequence and spaced apart. In the optical imaging lens of the present application, by limiting R12 / D6s within a reasonable range, the curvature of the image side of the sixth lens can be controlled, while constraining the outer diameter of the object side of the sixth spacing element, thereby improving the processability of the sixth lens and the bearing stability of the rear end of the optical imaging lens. However, at this time, the curvature of the image side of the sixth lens is relatively small, resulting in a wider aperture of the light beam emitted from the sixth lens and poorer ability to constrain edge light, resulting in severe imaging field curvature and strong stray light energy. By limiting R13 / (D6m-d6m) within a reasonable range, the curvature of the object side of the seventh lens is constrained, and the cooperation of the sixth lens and the seventh lens adjusts the optical path difference between the central light and the edge light, which can adjust the field curvature and reduce the aberration. At the same time, the inner diameter of the sixth spacer element is used to effectively block the stray light from outside the field of view, ensuring that the image is clear when the light is transmitted from the sixth lens to the seventh lens. It is also beneficial to a smoother transition between the structural part and the effective diameter part of the seventh lens, thereby improving the processability of the seventh lens. Combined with the reasonable annular width of the sixth spacer element, the bearing stability of the sixth spacer element and the seventh lens is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1 A schematic diagram showing some parameters of an optical imaging lens according to any optional embodiment of the present invention is shown;

[0022] Figure 2 A schematic structural diagram of an optical imaging lens according to a first embodiment of the present invention is shown;

[0023] Figure 3 A schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention is shown;

[0024] Figures 4 to 6 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of the first embodiment are respectively shown;

[0025] Figure 7 A schematic structural diagram of an optical imaging lens according to a third embodiment of the present invention is shown;

[0026] Figure 8 A schematic structural diagram of an optical imaging lens according to a fourth embodiment of the present invention is shown;

[0027] Figures 9 to 11 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Example 3 are respectively shown;

[0028] Fig.12 A schematic structural diagram of an optical imaging lens according to a fifth embodiment of the present invention is shown;

[0029] Fig.13 A schematic structural diagram of an optical imaging lens according to a sixth embodiment of the present invention is shown;

[0030] Figures 14 to 16 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Example 5 are respectively shown;

[0031] Fig.17 A schematic structural diagram of an optical imaging lens according to a seventh embodiment of the present invention is shown;

[0032] Fig.18 A schematic structural diagram of an optical imaging lens according to an eighth embodiment of the present invention is shown;

[0033] Figures 19 to 21 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging lens of Example 7 are respectively shown;

[0034] Figure 22 to Figure 23 The stray light path diagram and stray light energy intensity distribution diagram of an optical imaging lens of an optional embodiment of the present invention under the conditions of R12 / D6s=2.58 and R13 / (D6m-d6m)=11.04 are respectively shown;

[0035] Figure 24 to Figure 25 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens under the conditions of R12 / D6s=2.58 and R13 / (D6m-d6m)=12 in the prior art are shown respectively;

[0036] Figure 26 to Figure 27 The stray light path diagram and stray light energy intensity distribution diagram of the optical imaging lens in the prior art under the conditions of R12 / D6s=2.58 and R13 / (D6m-d6m)=10 are respectively shown.

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

[0038] E1, the first lens; P1, the first spacing element; E2, the second lens; P2, the second spacing element; E3, the third lens; P3, the third spacing element; E4, the fourth lens; P4, the fourth spacing element; P4b, the fourth auxiliary spacing element; E5, the fifth lens; P5, the fifth spacing element; E6, the sixth lens; P6, the sixth spacing element; P6b, the sixth auxiliary spacing element; E7, the seventh lens; S1, the object side surface of the first lens; S2, the image side surface of the first lens; S3, the object side surface of the second lens; S4, the image side surface of the second lens; S6, the object side surface of the third lens; S7, the image side surface of the third lens; S8, the object side surface of the fourth lens; S9, the image side surface of the fourth lens; S10, the object side surface of the fifth lens; S11, the image side surface of the fifth lens; S12, the object side surface of the sixth lens; S13, the image side surface of the sixth lens; S14, the object side surface of the seventh lens; S15, the image side surface of the seventh lens. 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 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 ordinary knowledgeable people in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity and concavity. For the eye-side surface, 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 display-side surface, 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.

[0045] In order to solve the problem of serious aberration generated at the rear end of an optical imaging lens in the prior art, the present invention provides an optical imaging lens.

[0046] First embodiment

[0047] like Figures 1 to 23 As shown, the optical imaging lens has seven lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel. The lens group includes a first lens to a seventh lens arranged in sequence from the object side to the image side of the optical imaging lens; the spacer element group includes at least a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; the lens group and the spacer element group are accommodated in the lens barrel; wherein the curvature radius R12 of the image side surface of the sixth lens and the outer diameter D6s of the object side surface of the sixth spacer element satisfy: -2.72≤R12 / D6s≤-1.15; the curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 10.25≤R13 / (D6m-d6m)≤11.08.

[0048] The optical imaging lens of the present application uses seven lenses with optical focal length, and the first lens to the seventh lens are arranged in sequence and spaced apart. In the optical imaging lens of the present application, by limiting R12 / D6s within a reasonable range, the curvature of the image side of the sixth lens can be controlled, while constraining the outer diameter of the object side of the sixth spacing element, thereby improving the processability of the sixth lens and the bearing stability of the rear end of the optical imaging lens. However, at this time, the curvature of the image side of the sixth lens is relatively small, resulting in a wider aperture of the light beam emitted from the sixth lens and poorer ability to constrain edge light, resulting in severe imaging field curvature and strong stray light energy. By limiting R13 / (D6m-d6m) within a reasonable range, the curvature of the object side of the seventh lens is constrained, and the cooperation of the sixth lens and the seventh lens adjusts the optical path difference between the central light and the edge light, which can adjust the field curvature and reduce the aberration. At the same time, the inner diameter of the sixth spacer element is used to effectively block the stray light from outside the field of view, ensuring that the image is clear when the light is transmitted from the sixth lens to the seventh lens. It is also beneficial to a smoother transition between the structural part and the effective diameter part of the seventh lens, thereby improving the processability of the seventh lens. Combined with the reasonable annular width of the sixth spacer element, the bearing stability of the sixth spacer element and the seventh lens is improved.

[0049] Table 1 below shows the stray light distribution of the optical imaging lens of the optional embodiment scheme 1 of the present application and schemes 2 and 3 in the prior art under the condition of R12 / D6s=2.58 with different values ​​of R13 / (D6m-d6m). Among them, in the stray light energy intensity distribution diagram, the X and Y axes represent the spatial position of the imaging surface, showing the energy distribution peak position of the stray light corresponding to the imaging surface, and the color depth represents the intensity of the stray light energy, that is, the luminous flux of the stray light per square millimeter on the imaging surface (unit: FLUX / sq-MM).

[0050] Table 1

[0051] Program No. 1 2 3 R12 / D6s 2.58 2.58 2.58 R13 / (D6m-d6m) 11.04 12 10 Stray light path diagram Attached Fig. 22 Attached Fig.24 Attached Fig.26 Stray light energy intensity distribution Attached Fig.23 Attached Fig.25 Attached Fig. 27

[0052] The optical imaging lenses shown in Scheme 2 and Scheme 3 belong to the prior art. When R12 / D6s=2.58 and R13 / (D6m-d6m)=12 in Scheme 2, the light distribution is as follows: Fig.24 and Fig.25 As shown in the figure, when the value of R13 / (D6m-d6m) is too large, the maximum energy intensity of the stray light on the imaging surface of the optical imaging lens can reach 9.69e-6 (FLUX / sq-MM), the stray light energy is high, and the imaging clarity is low. When R12 / D6s=2.58、R13 / (D6m-d6m)=10 in scheme 3, the light distribution is as follows Fig.26 and Fig. 27As shown in FIG. 1 , when the value of R13 / (D6m-d6m) is too small, the maximum energy intensity of the stray light on the imaging surface of the optical imaging lens is as high as 1.19e-5 (FLUX / sq-MM), which seriously affects the imaging quality.

[0053] The optical imaging lens shown in Scheme 1 belongs to an embodiment of the present application. When Scheme 1 is R12 / D6s=2.58 and R13 / (D6m-d6m)=11.04, the distribution of stray light is as follows: Fig. 22 and Fig.23 As shown, the optical imaging lens of the present application has clear imaging, reduced aberration, and significantly reduced stray light energy.

[0054] In this embodiment, the spacer element group further includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens and the interval EP34 between the third spacer element and the fourth spacer element along the optical axis of the optical imaging lens satisfy: 11.97≤f4 / EP34≤36.67. If the value of f4 / EP34 is too large, the effective focal length of the fourth lens is too long relative to the interval between the third spacer element and the fourth spacer element, resulting in unnecessary refraction of light during the transmission process from the third lens to the fourth lens, introducing aberrations, thereby affecting the clarity and contrast of the imaging. If the value of f4 / EP34 is too small, under the condition that the effective focal length of the fourth lens is too short or the interval between the third spacer element and the fourth spacer element along the optical axis of the optical imaging lens is too large, the light focusing ability of the lens group is weakened, affecting the brightness and details of the imaging, and at the same time increasing the physical size of the lens group, which is not conducive to the miniaturization of the optical imaging lens. By limiting f4 / EP34 within a reasonable range, the physical size and optical performance of the optical imaging lens can be balanced, and aberration problems caused by improper setting of the focal length of the fourth lens and the spacing of the spacer elements before and after the fourth lens can be avoided. Reasonable control of the ratio of f4 / EP34 greatly enhances the stability of the optical imaging lens and reduces the impact of temperature changes or vibrations on the imaging quality.

[0055] In this embodiment, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The air spacing T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens and the maximum thickness CP3 of the third spacer element satisfy: 2.54≤T34 / CP3≤4.63. If the value of T34 / CP3 is too large, the air spacing between the third lens and the fourth lens on the optical axis of the optical imaging lens is much larger than the maximum thickness of the third spacer element, which may lead to insufficient strength of the third spacer element and easy deformation during assembly, affecting the precise spacing between the third lens and the fourth lens, thereby reducing the imaging quality. If the value of T34 / CP3 is too small, the thickness of the third spacer element is too large, which will increase the overall thickness of the lens group, which is not conducive to the miniaturization and thinness design of the optical imaging lens, and will increase useless light refraction and reduce imaging clarity. By limiting T34 / CP3 within a reasonable range, the strength of the third spacer element can be ensured to avoid deformation caused by excessive pressure during assembly. At the same time, by adjusting the thickness of the third spacing element, the field curvature can be adjusted, the resolution can be increased, and the imaging quality of the optical imaging lens can be improved.

[0056] In this embodiment, the spacer element group further includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, and the effective focal length f1 of the first lens, the spacing EP01 between the object side end surface of the lens barrel and the first spacer element along the optical axis of the optical imaging lens, and the center thickness CT1 of the first lens on the optical axis satisfy: 3.08≤f1 / (EP01+CT1)≤3.7. If the value of f1 / (EP01+CT1) is too large, the field curvature sensitivity of the first lens will be reduced, but the refraction angle of the edge light will increase due to the large effective focal length of the first lens, thereby increasing the aberration of the optical imaging lens. If the value of f1 / (EP01+CT1) is too small, the effective focal length of the first lens is too small, which will cause the refraction angle of the light on the first lens to be too small, affecting the focusing effect of the light, increasing the field curvature, and also reducing the imaging quality. By limiting f1 / (EP01+CT1) within a reasonable range, the field curvature sensitivity of the first lens can be effectively reduced, while controlling the thickness of the first spacer element, improving assembly stability, reducing stray light, and thus improving imaging quality.

[0057] In this embodiment, the spacer element group further includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and the air interval T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air interval T23 between the second lens and the third lens on the optical axis, and the interval EP12 between the first spacer element and the second spacer element along the optical axis satisfy the following: 1.21≤(T12+T23) / EP12≤1.96. If the value of (T12+T23) / EP12 is too large, it indicates that the sum of the air intervals between the first lens, the second lens, and the third lens is too large relative to the interval between the first spacer element and the second spacer element, resulting in insufficient edge thickness of the second lens, increased scattering of light at the edge of the second lens, and reduced imaging quality. If the value of (T12+T23) / EP12 is too small, when the sum of the air intervals between the first lens, the second lens and the third lens is too small relative to the interval between the first spacing element and the second spacing element or the air interval between the first lens and the second lens on the optical axis of the optical imaging lens is too large, the assembly accuracy of the lens group is reduced and the assembly difficulty is increased. At the same time, if the air interval between the front lenses is too small, the propagation space of light between the lenses will be too compact, introducing more aberrations and stray light, affecting the image clarity. By limiting (T12+T23) / EP12 within a reasonable range, the edge thickness of the second lens can be constrained by constraining the distance between the first spacing element and the second spacing element, and the center thickness of the second lens can be constrained by the on-axis air interval between the first lens, the second lens and the third lens, thereby effectively constraining the edge thickness ratio of the second lens, ensuring that the edge thickness of the second lens is conducive to improving the molding stability of the second lens, and by reasonably controlling the air interval between the front lenses, the assembly stability and the smooth transmission of light between the lenses are improved, and stray light is reduced, thereby improving the image quality.

[0058] In this embodiment, the spacer element group further includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy: -104.78≤f2 / (CT2+CP2)≤-68.8. If the value of f2 / (CT2+CP2) is too large, the effective focal length of the second lens is much smaller than the sum of the center thickness of the second lens and the maximum thickness of the second spacer element, resulting in a weakened contribution of the second lens in the optical imaging lens, reducing the focusing ability of the optical imaging lens, and increasing the refraction angle of light, introducing more aberrations. If the value of f2 / (CT2+CP2) is too small, the effective focal length of the second lens will be too long, increasing the refraction angle of light between the second lens and the third lens, or the sum of the center thickness of the second lens and the maximum thickness of the second spacer element will be too small, resulting in unclear imaging. By limiting f2 / (CT2+CP2) within a reasonable range, the refraction angle of light between the second lens and the third lens can be reasonably set to avoid problems such as unclear imaging and increased aberrations, improve imaging quality, and reasonably allocate the layout of the middle lens and the spacing element of the optical imaging lens, thereby ensuring the stability of the assembly of the second lens and the third lens.

[0059] In this embodiment, the spacer element group further includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The effective focal length f3 of the third lens and the interval EP23 between the second spacer element and the third spacer element along the optical axis of the optical imaging lens satisfy: -44.2≤f3 / EP23≤-27.5. If the value of f3 / EP23 is too large, the effective focal length of the third lens is too short, resulting in premature focusing of the light, affecting the imaging quality and increasing aberrations. If the value of f3 / EP23 is too small, the effective focal length of the third lens is too long, increasing the refraction angle of the light from the third lens to the fourth lens, thereby increasing aberrations and stray light. By limiting f3 / EP23 within a reasonable range, the physical size and optical performance of the optical imaging lens can be balanced, the aberration problem caused by the effective focal length of the third lens being too long or the interval between the second spacer element and the third spacer element being too small can be avoided, the stability of the optical imaging lens can be enhanced, and the influence of temperature changes or vibrations on the imaging quality can be reduced.

[0060] In this embodiment, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. 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 element satisfy: 1.69≤R6 / d3s≤4.31. If the value of R6 / d3s is too large, the angle of the light in the third lens will be too large, which will increase the sensitivity of the optical imaging lens and reduce the imaging quality. If the value of R6 / d3s is too small, the angle of the light in the third lens will be too small, which will reduce the light utilization efficiency of the optical imaging lens, and at the same time, more invalid light will be generated, reducing the imaging quality. By limiting R6 / d3s within a reasonable range, the curvature radius of the image side surface of the third lens can be controlled to be appropriate, so that the light angle is kept within a reasonable range, and the sensitivity of the optical imaging lens is reduced. At the same time, by constraining the inner diameter size of the object side surface of the third spacer element by R6 / d3s, the invalid light reflected in the third lens can be effectively blocked, the risk of stray light generation can be reduced, and the imaging quality can be improved.

[0061] In this embodiment, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The outer diameter D3m of the image side surface of the third spacer element and the curvature radius R7 of the object side surface of the fourth lens satisfy: 2.84≤R7 / D3m≤4.92. If the value of R7 / D3m is too large, the angle of the light at the fourth lens will be too large, reducing the stability of the optical imaging lens and increasing aberrations. If the value of R7 / D3m is too small, it will cause improper focusing of the light, increase field curvature and aberrations, and at the same time, due to the small outer diameter design, the assembly stability is affected. By limiting R7 / D3m within a reasonable range, the curvature radius of the object side surface of the fourth lens can be controlled, thereby keeping the light angle within a reasonable range and enhancing the stability of the optical imaging lens. At the same time, the outer diameter of the image side surface of the third spacer element is constrained by the range of R7 / D3m to ensure assembly stability and improve imaging quality.

[0062] In this embodiment, the spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The radius of curvature R8 of the image side surface of the fourth lens and the outer diameter D4s of the object side surface of the fourth spacer element satisfy: -2.1≤R8 / D4s≤-0.71. If the value of R8 / D4s is too large, it will cause large aberrations in the transmission process of light between the fourth lens and the fifth lens, increase stray light, and affect imaging clarity. If the value of R8 / D4s is too small, the light angle will be too small, affecting the focusing effect of the light, increasing the field curvature, and thus affecting the imaging quality. By limiting R8 / D4s within a reasonable range, the radius of curvature of the image side surface of the fourth lens can be controlled, thereby keeping the light angle within a reasonable range. At the same time, by constraining the outer diameter of the object side surface of the fourth spacer element within the range of R8 / D4s, the assembly stability can be ensured and the imaging quality can be improved.

[0063] In this embodiment, the spacer element group also includes a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens. The outer diameter D5m of the image side surface of the fifth spacer element, the inner diameter d5m of the image side surface of the fifth spacer element, and the curvature radius R11 of the object side surface of the sixth lens satisfy: 1.54≤(D5m-d5m) / R11≤1.76. If the value of (D5m-d5m) / R11 is too large, the curvature radius of the object side surface of the sixth lens is too small, which will increase the field curvature of the optical imaging lens. The unreasonable design of the inner and outer diameters of the image side surface of the fifth spacer element is likely to increase stray light and affect the imaging clarity. If the value of (D5m-d5m) / R11 is too small, the curvature radius of the object side surface of the sixth lens is too large, resulting in improper light focusing and increased aberrations. At the same time, the thickness of the fifth spacer element is too small, the structural strength is greatly weakened, and the assembly stability is reduced. By limiting (D5m-d5m) / R11 within a reasonable range, the curvature of the object side of the sixth lens can be constrained, and at the same time, the inner and outer diameter difference of the image side of the fifth spacing element can be constrained, the field curvature can be adjusted to reduce aberrations, and stray light outside the field of view can be effectively blocked, ensuring clear imaging when light is transmitted from the fifth lens to the sixth lens, while ensuring assembly stability.

[0064] In this embodiment, the spacer element group further includes a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and the air spacing T56 between the fifth lens and the sixth lens on the optical axis of the optical imaging lens and the spacing EP56 between the fifth spacer element and the sixth spacer element along the optical axis satisfy the following conditions: 2.57≤EP56 / T56≤4.92. If the value of EP56 / T56 is too large, the spacing between the fifth spacer element and the sixth spacer element is too large relative to the air spacing between the fifth lens and the sixth lens on the optical axis, resulting in insufficient edge thickness of the sixth lens, affecting the molding stability and optical performance of the sixth lens. If the value of EP56 / T56 is too small, the spacing between the fifth spacer element and the sixth spacer element is too small relative to the air spacing between the fifth lens and the sixth lens on the optical axis, reducing the light transmission efficiency between the lenses and increasing stray light. At the same time, an excessively small air spacing will lead to assembly difficulties, increase the risk of unnecessary contact between the fifth lens and the sixth lens, and affect the reliability of the optical imaging lens. By limiting EP56 / T56 within a reasonable range, the thickness ratio of the sixth lens can be effectively constrained, ensuring that the edge thickness of the sixth lens is conducive to the stability of the molding of the sixth lens, thereby improving the structural stability and imaging quality of the optical imaging lens while ensuring assembly stability.

[0065] 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 of the first lens is concave, the second lens has negative focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave, the third lens has negative focal power, and the image side surface of the third lens is concave, the fourth lens has positive focal power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex, the fifth lens has negative focal power, and the image side surface of the fifth lens is concave, the sixth lens has positive focal power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex, the seventh lens has negative focal power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave.

[0066] The lens power and surface shape of the optical imaging lens optimize the trend of light, ensure that the light of the optical imaging lens can smoothly transition, and achieve efficient focusing and moderate divergence. Specifically, the first lens is a convexo-concave type with positive power. The convex surface of the object side of the first lens collects light, and the image side of the first lens is a concave surface, which helps to control the initial convergence of light and is beneficial to the light management of the subsequent lens group. The second lens has negative power and adopts a convexo-concave type. The convex surface of the object side of the second lens further converges the light, and the image side of the second lens is a concave surface, which helps to diverge the light. The third lens maintains negative power, and the image side of the third lens is a concave surface, which can further diverge the light, balance the focusing effect of the first lens and the second lens, and reduce aberrations. The fourth lens has positive power, and the object side of the fourth lens and the image side of the fourth lens are both convex, which can significantly enhance the focusing ability of light, converge the divergent light again, and ensure that the light can reach the best focusing state when passing through the middle lens. The fifth lens has negative optical power, and the image side surface of the fifth lens is a concave surface, which can properly diverge the light to balance the strong focusing effect of the fourth lens and prevent the light from being over-concentrated and causing overheating or damage.

[0067] At the same time, the sixth lens has positive focal length, and the object side surface of the sixth lens and the image side surface of the sixth lens are both convex surfaces, which can further strengthen the focus of the light, prepare for the final focus in the imaging process, make the light more concentrated, and improve the sharpness and clarity of the imaging. Finally, the combination of the negative focal length and the concave-convex surface of the seventh lens, as the terminal lens of the optical imaging lens, ensures that the light can smoothly converge on the imaging surface after passing through the front lens group, and achieves clear, low-distortion image output. The entire lens group realizes a smooth transition of light from the front to the back end, ensuring that the light can still maintain a good balance of focus and divergence after multiple layers of refraction. The optical imaging lens not only takes into account the natural trend of light, but also takes into account the compactness of the structure and optical performance, achieving large aperture, large field of view and high-resolution imaging effects, while effectively controlling aberrations and stray light, and improving the clarity and stability of imaging.

[0068] 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. Optionally, the optical imaging lens can be simulated by CODEV software. In the process of simulation using the above software and / or tools, the surface shape of each lens can be appropriately adjusted according to the surface shape of the software and / or tool used.

[0069] In this embodiment, each lens can be selected as a trimmed lens. The outer diameter surface of the trimmed lens has a trimmed structure and a non-trimmed structure, and the outer diameter of the trimmed structure is smaller than the outer diameter of the non-trimmed structure. The outer diameter of the trimmed lens usually refers to the outer diameter of the non-trimmed structure.

[0070] In this embodiment, each spacer element can be selected as a trimming spacer element. The outer annular surface of the trimming spacer element has a trimming portion and a non-trimming portion, and the outer diameter of the trimming portion is smaller than the outer diameter of the non-trimming portion. The outer diameter of the trimming spacer element usually refers to the maximum outer diameter of the non-trimming portion.

[0071] Second embodiment

[0072] like Figures 1 to 23 As shown, the optical imaging lens has seven lenses with optical power, and the optical imaging lens includes a lens group, a spacer element group and a lens barrel. From the object side to the image side of the optical imaging lens, the lens group includes a first lens to a seventh lens arranged in sequence; the spacer element group includes at least a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; the lens group and the spacer element group are accommodated in the lens barrel; wherein the spacer element group also includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and the first lens The air interval T12 between the second lens and the second lens on the optical axis of the optical imaging lens, the air interval T23 between the second lens and the third lens on the optical axis, and the interval EP12 between the first spacing element and the second spacing element along the optical axis satisfy: 1.21≤(T12+T23) / EP12≤1.96; the spacing element group also includes a second spacing element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacing element satisfy: -104.78≤f2 / (CT2+CP2)≤-68.8.

[0073] The optical imaging lens of the present application uses seven lenses with optical focal length, and the first lens to the seventh lens are arranged in sequence and spaced apart. In the optical imaging lens of the present application, by limiting (T12+T23) / EP12 within a reasonable range, the edge thickness of the second lens can be constrained by constraining the distance between the first spacing element and the second spacing element, and the center thickness of the second lens can be constrained by the on-axis air gap between the first lens, the second lens and the third lens, thereby effectively constraining the edge thickness ratio of the second lens, ensuring the edge thickness of the second lens is conducive to improving the molding stability of the second lens, and by reasonably controlling the air gap between the front lenses, the assembly stability and the smooth transmission of light between the lenses are improved, stray light is reduced, and thus the imaging quality is improved. However, under the condition of ensuring the structural stability of the optical imaging lens, the curvature radius and the center thickness of the second lens are improperly set, and the second lens has poor control over light, resulting in problems such as unclear final imaging and increased aberrations, and the effect of aberration control is not good. By limiting f2 / (CT2+CP2) within a reasonable range, reasonably setting the refraction angle of light between the second lens and the third lens, and reasonably allocating the layout of the middle lens and the spacing element of the optical imaging lens, the stability of the assembly of the second lens and the third lens is ensured.

[0074] It should be noted that this embodiment also includes other conditional expressions in the above embodiment, which will not be described one by one here.

[0075] Optionally, the optical imaging lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0076] 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.

[0077] 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.

[0078] Figure 1 A schematic diagram of the dimensions of an optical imaging lens of the present application is shown. Figure 1Parameters such as d3s, D4s, and EP34 are marked 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.

[0079] 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.

[0080] It should be noted that any one of the following embodiments 1 to 8 is applicable to all embodiments of the present application.

[0081] Embodiment 1

[0082] like Figure 2 As shown, the optical imaging lens of the first embodiment of the present application is described. Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 is shown.

[0083] like Figure 2 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a sixth auxiliary spacer P6b, and a seventh lens E7. The sixth auxiliary spacer P6b is located on the image side of the sixth spacer and at least partially contacts the image side surface of the sixth spacer.

[0084] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S12 of the sixth lens is convex, and the image side surface S13 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S14 of the seventh lens is convex, and the image side surface S15 of the seventh lens is concave. The optical imaging lens also has a light shielding stop and a filter not shown in the drawings, S5 represents the light shielding stop, and the filter has an object side surface S16 and an image side surface S17 of the filter. Light from the object passes through S1 to S17 of the optical imaging lens to reach the imaging surface IMG.

[0085] Table 2 shows the basic structural parameters of the optical imaging lens of Example 1, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0086] Table 2

[0087]

[0088]

[0089] In Embodiment 1, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0090]

[0091] 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 direction of the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 2 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below 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 in Example 1.

[0092] Table 3 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by formula (1) given in the above embodiment 1. In this embodiment, the object side surface and image side surface of the first lens to the seventh lens are all aspherical surfaces.

[0093] Table 3

[0094]

[0095]

[0096] 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 optical 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 distortion curve of the optical imaging lens of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0097] 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.

[0098] Embodiment 2

[0099] like Figure 3 As shown, the optical imaging lens of the second embodiment of the present application is described, which is different from the first embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrels, etc. are different.

[0100] Figure 3 The schematic diagram of the structure of the optical imaging lens of the second embodiment is shown. For the sake of brevity, some descriptions similar to those of the first embodiment are omitted. In this embodiment, a fourth auxiliary spacing element P4b is also provided between the fourth lens and the fifth lens, and the fourth auxiliary spacing element is located on the image side of the fourth spacing element and is at least partially in contact with the image side surface of the fourth spacing element. This arrangement allows the large step difference between the fourth lens and the fifth lens to be stably supported by the two spacing elements, reduces the molding difficulty of the fourth lens structure, improves the assembly stability, and is also conducive to a more compact structure of the optical imaging lens and miniaturization.

[0101] Embodiment 3

[0102] like Figure 7 As shown, the optical imaging lens of the third embodiment of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to a third embodiment is shown.

[0103] like Figure 7 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a sixth auxiliary spacing element P6b, and a seventh lens E7.

[0104] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S10 of the fifth lens is concave, and the image side surface S11 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S12 of the sixth lens is convex, and the image side surface S13 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S14 of the seventh lens is convex, and the image side surface S15 of the seventh lens is concave. The optical imaging lens also has a light shielding stop and a filter not shown in the drawings, S5 represents the light shielding stop, and the filter has an object side surface S16 and an image side surface S17 of the filter. Light from the object passes through S1 to S17 of the optical imaging lens to reach the imaging surface IMG.

[0105] Table 4 shows the basic structural parameters of the optical imaging lens of Example 3, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0106] Table 4

[0107] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless STO Spherical endless -0.2300 S1 Aspheric 3.1052 1.0287 1.55 55.9 0.1734 S2 Aspheric 13.5409 0.2830 -0.1130 S3 Aspheric 21.3493 0.3101 1.68 19.2 31.5065 S4 Aspheric 8.9166 0.3538 14.0582 S5 Spherical endless 0.3393 S6 Aspheric -70.0000 0.4637 1.68 19.2 74.9920 S7 Aspheric 17.6652 0.0558 2.5790 S8 Aspheric 29.5169 0.7976 1.55 55.9 -3.9903 S9 Aspheric -7.1769 0.6828 -1.3090 S10 Aspheric -70.0000 0.4394 1.57 37.4 -80.0000 S11 Aspheric 4.5921 0.1791 0.086 S12 Aspheric 2.6001 0.9090 1.55 55.9 -1.0477 S13 Aspheric -22.6075 1.0587 -78.6471 S14 Aspheric 8.9727 0.4411 1.54 55.7 0.2788 S15 Aspheric 2.0313 0.6445 -1.0000 S16 Spherical endless 0.2100 S17 Spherical endless 0.3761 IMG Spherical endless

[0108] Table 5 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by formula (1) given in the above embodiment 1. In this embodiment, the object side surface and image side surface of the first lens to the seventh lens are all aspherical surfaces.

[0109] Table 5

[0110]

[0111]

[0112] Fig. 9 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 optical imaging lens. Fig.10 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.11 The distortion curve of the optical imaging lens of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0113] according to Figures 9 to 11It can be seen that the optical imaging lens provided in the third embodiment can achieve good imaging quality.

[0114] Embodiment 4

[0115] like Figure 8 As shown, the optical imaging lens of the fourth embodiment of the present application is described, which is different from the third embodiment in that the distances and thicknesses between the spacer elements, lenses, lens barrels, etc. are different.

[0116] Figure 8 The schematic diagram of the structure of the optical imaging lens of the fourth embodiment is shown. For the sake of brevity, some descriptions similar to those of the third embodiment are omitted. In this embodiment, a fourth auxiliary spacing element P4b is also provided between the fourth lens and the fifth lens. This arrangement allows the large step difference between the fourth lens and the fifth lens to be stably supported by two spacing elements, reduces the molding difficulty of the fourth lens structure, improves the assembly stability, and is also conducive to a more compact structure of the optical imaging lens and miniaturization.

[0117] Embodiment 5

[0118] like Fig.12 As shown, the optical imaging lens of the fifth embodiment of the present application is described. Fig.12 A schematic structural diagram of an optical imaging lens according to a fifth embodiment is shown.

[0119] like Fig.12 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a sixth auxiliary spacing element P6b, and a seventh lens E7.

[0120] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S10 of the fifth lens is concave, and the image side surface S11 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S12 of the sixth lens is convex, and the image side surface S13 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S14 of the seventh lens is convex, and the image side surface S15 of the seventh lens is concave. The optical imaging lens also has a light shielding stop and a filter not shown in the drawings, S5 represents the light shielding stop, and the filter has an object side surface S16 and an image side surface S17 of the filter. Light from the object passes through S1 to S17 of the optical imaging lens to reach the imaging surface IMG.

[0121] Table 6 shows the basic structural parameters of the optical imaging lens of Example 5, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0122] Table 6

[0123] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless STO Spherical endless -0.2300 S1 Aspheric 3.1258 1.0287 1.55 55.9 0.1734 S2 Aspheric 12.6082 0 2830 -0.1130 S3 Aspheric 21.4584 0.3101 1.68 19.2 31.5065 S4 Aspheric 9.6893 0.3538 14.0582 S5 Spherical endless 0.3393 S6 Aspheric -69.9994 0.4637 1.68 19.2 74.9920 S7 Aspheric 15.0201 0.0558 2.5790 S8 Aspheric 21.9636 0.7976 1.55 55.9 -3.9903 S9 Aspheric -10.4560 0.6828 -1.3090 S10 Aspheric 17.8245 0.4394 1.57 37.4 -80.0000 S11 Aspheric 4.1774 0.1791 0.0863 S12 Aspheric 2.5543 0.9090 1.55 55.9 -1.0477 S13 Aspheric -29.4832 1.0587 -78.6471 S14 Aspheric 8.7193 0.4411 1.54 55.7 0.2788 S15 Aspheric 2.0383 0.6445 -1.0000 S16 Spherical endless 0.2100 S17 Spherical endless 0.3761 IMG Spherical endless

[0124] Table 7 shows the coefficients of the higher order terms that can be used for each aspheric mirror surface in the embodiment, wherein the surface shape of each aspheric surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the seventh lens are all aspheric surfaces.

[0125] Table 7

[0126]

[0127]

[0128] Fig.14 The axial chromatic aberration curve of the optical imaging lens of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig.15 The astigmatism curve of the optical imaging lens of Example 5 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.16 The distortion curve of the optical imaging lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0129] according to Figures 9 to 11It can be seen that the optical imaging lens provided in Example 5 can achieve good imaging quality.

[0130] Embodiment 6

[0131] like Fig.13 As shown, the optical imaging lens of the sixth embodiment of the present application is described, which differs from the fifth embodiment in that the distances and thicknesses between the various spacing elements, lenses, lens barrels, etc. are different.

[0132] Fig.13 The structure diagram of the optical imaging lens of the sixth embodiment is shown. For the sake of brevity, some descriptions similar to those of the fifth embodiment are omitted. In this embodiment, a fourth auxiliary spacing element P4b is also provided between the fourth lens and the fifth lens. This arrangement allows the large step difference between the fourth lens and the fifth lens to be stably supported by two spacing elements, reduces the molding difficulty of the fourth lens structure, improves the assembly stability, and is also conducive to a more compact structure of the optical imaging lens and miniaturization.

[0133] Embodiment 7

[0134] like Fig.17 As shown, the optical imaging lens of the seventh embodiment of the present application is described. Fig.17 A schematic structural diagram of an optical imaging lens according to a seventh embodiment is shown.

[0135] like Fig.17 As shown, the optical imaging lens includes, from the object side to the image side, a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, a fifth lens E5, a fifth spacing element P5, a sixth lens E6, a sixth spacing element P6, a sixth auxiliary spacing element P6b, and a seventh lens E7.

[0136] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S6 of the third lens is convex, and the image side surface S7 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S8 of the fourth lens is convex, and the image side surface S9 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S10 of the fifth lens is convex, and the image side surface S11 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S12 of the sixth lens is convex, and the image side surface S13 of the sixth lens is convex. The seventh lens E7 has negative focal power, the object side surface S14 of the seventh lens is convex, and the image side surface S15 of the seventh lens is concave. The optical imaging lens also has a light shielding stop and a filter not shown in the drawings, S5 represents the light shielding stop, and the filter has an object side surface S16 and an image side surface S17 of the filter. Light from the object passes through S1 to S17 of the optical imaging lens to reach the imaging surface IMG.

[0137] Table 8 shows the basic structural parameters of the optical imaging lens of Example 7, wherein the units of the curvature radius, thickness / distance, effective radius and focal length are all millimeters (mm).

[0138] Table 8

[0139] Face number Surface type Radius of curvature thickness Refractive Index Abbe number Cone coefficient OBJ Spherical endless endless STO Spherical endless -0.2300 S1 Aspheric 3.1713 0.8662 1.55 55.9 0.0264 S2 Aspheric 10.6565 0.3966 1.1039 S3 Aspheric 16.0227 0.3075 1.68 19.2 15.4565 S4 Aspheric 8.1200 0.2259 -0.2383 S5 Spherical endless 0.1944 S6 Aspheric 13.3893 0.3639 1.68 19.2 0.2559 S7 Aspheric 7.5563 0.1018 -0.1439 S8 Aspheric 19.4782 0.8973 1.55 55.9 1.9476 S9 Aspheric -8.9113 0.6370 1.1650 S10 Aspheric -79.9999 0.5122 1.57 37.4 -80.0000 S11 Aspheric 4.6683 0.2179 0.1809 S12 Aspheric 2.6465 0.9020 1.55 55.9 -0.9805 S13 Aspheric -12.4415 1.0163 -53.4395 S14 Aspheric 9.4288 0.4714 1.54 55.7 0.6881 S15 Aspheric 2.0774 0.7506 -1.0081 S16 Spherical endless 0.2100 S17 Spherical endless 0.4859 IMG Spherical endless

[0140] Table 9 shows the high-order coefficients that can be used for each aspherical mirror surface in the embodiment, wherein the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. In this embodiment, the object side surface and the image side surface of the first lens to the seventh lens are all aspherical surfaces.

[0141] Table 9

[0142]

[0143]

[0144] Fig.19 The axial chromatic aberration curve of the optical imaging lens of Example 7 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 20 The astigmatism curve of the optical imaging lens of Example 7 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.21 The distortion curve of the optical imaging lens of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different field angles.

[0145] according to Figures 19 to 21It can be seen that the optical imaging lens provided in Example 7 can achieve good imaging quality.

[0146] Embodiment 8

[0147] like Fig.18 As shown, the optical imaging lens of the eighth embodiment of the present application is described, which differs from the seventh embodiment in that the distances and thicknesses between the various spacing elements, lenses, lens barrels, etc. are different.

[0148] Fig.18 The schematic diagram of the structure of the optical imaging lens of the eighth embodiment is shown. For the sake of brevity, some descriptions similar to those of the fifth embodiment are omitted. In this embodiment, a fourth auxiliary spacing element P4b is also provided between the fourth lens and the fifth lens. This arrangement allows the large step difference between the fourth lens and the fifth lens to be stably supported by two spacing elements, reduces the molding difficulty of the fourth lens structure, improves the assembly stability, and is also conducive to a more compact structure of the optical imaging lens and miniaturization.

[0149] In summary, the first to eighth embodiments of the optical imaging lens respectively satisfy the relationships shown in Table 10.

[0150] Table 10

[0151] Conditional / Example 1 2 3 4 5 6 7 8 f4 / EP34 15.63 33.49 11.97 21.67 15.64 36.67 13.54 32.19 T34 / CP3 3.86 3.86 2.54 2.54 2.54 2.54 4.63 4.63 f1 / (EP01+CT1) 3.55 3.55 3.08 3.08 3.17 3.17 3.70 3.70 (T12+T23) / EP12 1.70 1.70 1.96 1.96 1.46 1.46 1.21 1.21 f2 / (CT2+CP2) -104.78 -104.78 -68.80 -68.80 -79.36 -79.36 -74.97 -74.97 f3 / EP23 -44.20 -44.20 -39.99 -39.99 -27.50 -27.50 -40.25 -40.25 R6 / d3s 1.69 1.69 4.31 4.31 3.58 3.58 1.76 1.76 R7 / D3m 2.84 2.93 4.47 4.92 3.33 3.54 2.95 2.95 R8 / D4s -1.38 -2.10 -0.71 -1.09 -1.04 -1.59 -0.89 -1.32 (D5m-d5m) / R11 1.57 1.57 1.76 1.76 1.71 1.71 1.54 1.54 R12 / D6s -2.58 -2.58 -2.09 -2.09 -2.72 -2.72 -1.15 -1.15 R13 / (D6m-d6m) 11.04 11.04 10.54 10.54 10.25 10.25 11.08 11.08 EP56 / T56 2.57 2.57 4.92 4.92 4.08 4.08 2.92 2.92

[0152] Table 11 shows the effective focal lengths f1 to f7 of the optical imaging lenses of Examples 1 to 8, etc., in mm.

[0153] Table 11

[0154] Parameters / Examples 1 2 3 4 5 6 7 8 f 6.54 6.54 6.59 6.59 6.45 6.45 6.54 6.54 f1 8.38 8.38 7.14 7.14 7.34 7.34 7.95 7.95 f2 -34.79 -34.79 -22.85 -22.85 -26.36 -26.36 -24.71 -24.71 f3 -22.59 -22.59 -20.79 -20.79 -18.23 -18.23 -26.28 -26.28 f4 14.74 14.74 10.66 10.66 13.09 13.09 11.33 11.33 f5 -10.40 -10.40 -7.55 -7.55 -9.71 -9.71 -7.72 -7.72 f6 4.37 4.37 4.33 4.33 4.35 4.35 4.09 4.09 f7 -5.25 -5.25 -5.00 -5.00 -5.09 -5.09 -5.08 -5.08

[0155] Table 12 lists some structural parameters of the optical imaging lenses of Examples 1 to 8, with the unit being mm.

[0156] Table 12

[0157]

[0158]

[0159] Obviously, the embodiments described above are only some embodiments of the present invention, not all 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.

[0160] 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.

[0161] 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.

[0162] 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: The optical imaging lens has seven lenses with optical power, and the optical imaging lens includes: A lens group, wherein the lens group includes first to seventh lenses arranged in sequence from the object side to the image side of the optical imaging lens; a spacer element group, wherein the spacer element group includes at least a sixth spacer element located between the sixth lens and the seventh lens and at least partially in contact with the image side surface of the sixth lens; a lens barrel, wherein the lens group and the spacer element group are accommodated in the lens barrel; The curvature radius R12 of the image side surface of the sixth lens and the outer diameter of the object side surface of the sixth spacing element are D6s satisfies: -2.72≤R12 / D6s≤-1.15; The curvature radius R13 of the object side surface of the seventh lens, the outer diameter D6m of the image side surface of the sixth spacing element, and the inner diameter d6m of the image side surface of the sixth spacing element satisfy the following: 10.25≤R13 / (D6m-d6m)≤11.

08.

2. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The effective focal length f4 of the fourth lens and the interval EP34 between the third spacer element and the fourth spacer element along the optical axis of the optical imaging lens satisfy the following: 11.97≤f4 / EP34≤36.

67.

3. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and the air gap T34 between the third lens and the fourth lens on the optical axis of the optical imaging lens and the maximum thickness CP3 of the third spacer element satisfy the following: 2.54≤T34 / CP3≤4.

63.

4. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens. The effective focal length f1 of the first lens, the interval EP01 between the object side end surface of the lens barrel and the first spacer element along the optical axis of the optical imaging lens, and the center thickness CT1 of the first lens on the optical axis satisfy the following: 3.08≤f1 / (EP01+CT1)≤3.

7.

5. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, and a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens. The air gap T12 between the first lens and the second lens on the optical axis of the optical imaging lens, the air gap T23 between the second lens and the third lens on the optical axis, and the gap EP12 between the first spacer element and the second spacer element along the direction of the optical axis satisfy the following: 1.21≤(T12+T23) / EP12≤1.

96.

6. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and the effective focal length f2 of the second lens, the center thickness CT2 of the second lens on the optical axis of the optical imaging lens, and the maximum thickness CP2 of the second spacer element satisfy the following: -104.78≤f2 / (CT2+CP2)≤-68.

8.

7. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The effective focal length f3 of the third lens and the interval EP23 between the second spacer element and the third spacer element along the optical axis of the optical imaging lens satisfy: -44.2≤f3 / EP23≤-27.

5.

8. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. 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 element satisfy the following: 1.69≤R6 / d3s≤4.

31.

9. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens. The outer diameter D3m of the image side surface of the third spacer element and the curvature radius R7 of the object side surface of the fourth lens satisfy the following relationship: 2.84≤R7 / D3m≤4.

92.

10. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens. The curvature radius R8 of the image side surface of the fourth lens and the outer diameter D4s of the object side surface of the fourth spacer element satisfy the following: -2.1≤R8 / D4s≤-0.

71.

11. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and the outer diameter D5m of the image side surface of the fifth spacer element, the inner diameter d5m of the image side surface of the fifth spacer element, and the curvature radius R11 of the object side surface of the sixth lens satisfy the following: 1.54≤(D5m-d5m) / R11≤1.

76.

12. The optical imaging lens according to claim 1, wherein: The spacer element group also includes a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens, and the air spacing T56 between the fifth lens and the sixth lens on the optical axis of the optical imaging lens and the spacing EP56 between the fifth spacer element and the sixth spacer element along the direction of the optical axis satisfy the following: 2.57≤EP56 / T56≤4.

92.

13. The optical imaging lens according to claim 1, wherein: The first lens has positive focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave, the sixth lens has positive focal power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is convex, the seventh lens has negative focal power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave.

14. The optical imaging lens according to claim 1, wherein: The second lens has negative optical power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave, the third lens has negative optical power, and the image side surface of the third lens is concave, the fourth lens has positive optical power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex, the fifth lens has negative optical power, and the image side surface of the fifth lens is concave.

Images