Imaging lens

Abstract

This application provides an imaging lens, including a lens barrel and a lens group and a plurality of spacer elements housed within the lens barrel. The lens group includes a first lens to a seventh lens arranged sequentially along the optical axis from the object side to the image side. At least one surface of each of the first to seventh lenses has at least one inflection point. The plurality of spacer elements includes a fifth spacer element and a sixth spacer element. The imaging lens satisfies: 5.95 < (f5 + f6) / f < 7.90; -83.85 ≤ f7 / f67 ≤ -21.20; 0.75 <EP56 / (d6s‑d5s)<0.95。

Description

Technical Field

[0001] This application relates to the field of optical device technology, and in particular to an imaging lens. Background Technology

[0002] With the advent of the short video era, mobile phone photography has become mainstream. To meet users' needs in different scenarios, mobile phone camera pixels are constantly being upgraded, and reliability requirements are increasing. The optical performance of 6-element lenses is gradually reaching its limit, making it difficult to meet the needs of high-pixel sensors. 7-element lenses, through improved design, can better match high-pixel sensors and avoid image quality degradation due to insufficient lens elements. However, the current requirement for lightweight smartphones has led to more stringent requirements on lens size. The limited volume places higher reliability demands on the lens structure and arrangement, especially the fifth, sixth, and seventh lenses. In a 7-element lens, the last three lenses can specifically correct aberrations such as chromatic aberration and spherical aberration, ensuring accurate color reproduction and sharp edges. However, in high-temperature and high-humidity environments, because the last three lenses have a large outer diameter / thickness ratio, and the water absorption and expansion characteristics of resin materials, the last three lenses are prone to deformation due to pressure from the lens barrel, leading to optical system failure. Therefore, the structural arrangement design of the last few lenses, especially the reliability design, is particularly important. Summary of the Invention

[0003] One advantage of this application is that it provides an imaging lens that can solve the problem of adverse effects on lens performance caused by the last three lenses in a traditional 7-element lens absorbing water, expanding and deforming when made of resin.

[0004] According to one aspect of the present application, an imaging lens provided by the present application includes a lens barrel, a lens group, and a plurality of spacer elements accommodated within the lens barrel; the lens group includes, arranged in sequence from the object side to the image side along the optical axis: a first lens with a positive optical power, the object side surface of the first lens being convex and the image side surface of the first lens being concave; a second lens with a negative optical power; a third lens with a positive optical power; a fourth lens with a negative optical power; a fifth lens with a positive optical power; a sixth lens with a positive optical power, the object side surface of the sixth lens being convex and the image side surface of the sixth lens being concave; a seventh lens with a negative optical power, the object side surface of the seventh lens being convex and the image side surface of the seventh lens being concave; the number of lenses with optical power is seven; there is a gap between adjacent two lenses; among the first lens to the seventh lens, at least one surface of each lens has at least one inflection point; the plurality of spacer elements includes a fifth spacer element placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element placed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; the imaging lens further satisfies: 5.95 < (f5 + f6) / f < 7.90; -83.85 ≤ f7 / T67 ≤ -21.20; 0.75 < EP56 / (d6s - d5s) < 0.95; where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, T67 represents the on-axis air gap between the sixth lens and the seventh lens, EP56 is the distance between the fifth spacer element and the sixth spacer element along the optical axis direction, d6s is the inner diameter of the object side surface of the sixth spacer element, and d5s is the inner diameter of the object side surface of the fifth spacer element.

[0005] According to some embodiments of the present application, the object side surface of the second lens is convex and the image side surface of the second lens is concave; the object side surface of the third lens is convex; the object side surface of the fourth lens is concave and the image side surface of the fourth lens is convex; the object side surface of the fifth lens is convex.

[0006] According to some embodiments of the present application, the plurality of spacer elements further includes a second spacer element placed on the image side of the second lens and in contact with the image side surface of the second lens, and the imaging lens further satisfies: -0.60 ≤ f / f2 < -0.25, -6.60 ≤ f2 / d2s < -2.05, where f is the effective focal length of the imaging lens, f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

[0007] According to some embodiments of the present application, the plurality of spacer elements further include a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens. The imaging lens further satisfies: 9.65 < f3 / EP23 ≤ 11.30, where f3 is the effective focal length of the third lens, and EP23 is the spacing distance between the second spacer element and the third spacer element along the optical axis direction.

[0008] According to some embodiments of the present application, the imaging lens further satisfies: 2.45 < f6 / d6s ≤ 4.55, where f6 is the effective focal length of the sixth lens, and d6s is the inner diameter of the object side surface of the sixth spacer element.

[0009] According to some embodiments of the present application, the plurality of spacer elements further include a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens. The imaging lens further satisfies: 2.25 < f4 / (R7 + R8) < 2.85, -1.95 ≤ R8 / d4s < -1.25, where f4 is the effective focal length of the fourth lens, R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and d4s is the inner diameter of the object side surface of the fourth spacer element.

[0010] According to some embodiments of the present application, the plurality of spacer elements further include a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens. The imaging lens further satisfies: 0.75 < f1 / f5 ≤ 1.55, 1.40 < d5s / d1s < 2.05, where f1 is the effective focal length of the first lens, f5 is the effective focal length of the fifth lens, d5s is the inner diameter of the object side surface of the fifth spacer element, and d1s is the inner diameter of the object side surface of the first spacer element.

[0011] According to some embodiments of the present application, the plurality of spacer elements further include a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens. The imaging lens further satisfies: -0.60 ≤ EP45 / (DT52 - d4min) < -0.20, where EP45 is the spacing distance between the fourth spacer element and the fifth spacer element along the optical axis direction, DT52 is the effective semi-aperture of the image side surface of the fifth lens, and d4min is the minimum inner diameter of the fourth spacer element.

[0012] According to some embodiments of the present application, the imaging lens further satisfies: 1.6 ≤ FNO ≤ 1.8, 1.30 < d0s / EPD ≤ 1.55, where FNO is the f-number of the imaging lens, d0s is the inner diameter of the object side end face of the lens barrel, and EPD is the entrance pupil diameter of the imaging lens.

[0013] According to some embodiments of the present application, the imaging lens further satisfies: 2.75 < f6 / R12 < 9.90, 0.65 < EP56 / (CT6 + T67) < 1.15, where f6 is the effective focal length of the sixth lens, R12 is the radius of curvature of the image side surface of the sixth lens, EP56 is the distance between the fifth spacer element and the sixth spacer element along the optical axis direction, CP6 is the maximum thickness of the sixth spacer element along the optical axis direction, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0014] According to some embodiments of the present application, the imaging lens further satisfies: 2.80 < d6s / YC62 < 3.50, where d6s is the inner diameter of the object side surface of the sixth spacer element, and YC62 is the vertical distance from the critical point closest to the optical axis on the image side surface of the sixth lens to the optical axis.

[0015] According to some embodiments of the present application, the imaging lens further satisfies: -3.95 < (f7×N7) / OD7 < -2.10, where f7 is the effective focal length of the seventh lens, OD7 is the maximum outer diameter of the seventh lens, and N7 is the refractive index of the seventh lens.

[0016] According to some embodiments of the present application, the imaging lens further satisfies: 8.70 < (YC71 + YC72) / SAG72 < 23.05, where YC71 is the vertical distance from the critical point closest to the optical axis on the object side surface of the seventh lens to the optical axis, YC72 is the vertical distance from the critical point closest to the optical axis on the image side surface of the seventh lens to the optical axis, and SAG72 is the displacement along the optical axis direction from the intersection point of the image side surface of the seventh lens and the optical axis to the vertex of the effective semi-aperture of the image side surface of the seventh lens.

[0017] In summary, the present application provides a seven-piece lens with optical power. To achieve the design goal of increasing the aperture, the seven-piece lens is arranged with alternating positive and negative optical powers (positive, negative, positive, negative, positive, positive, negative). Among them, the fifth lens, the sixth lens, and the seventh lens respectively satisfy 5.95 < (f5 + f6) / f < 7.90 and -83.85 ≤ f7 / T67 ≤ -21.20, which constraints the relationship between the effective focal lengths of the fifth lens, the sixth lens, and the seventh lens and the axial air gap between the sixth lens and the seventh lens. The overall shapes and the rear-stage spatial arrangements of the fifth lens, the sixth lens, and the seventh lens are defined, effectively correcting aberrations, optimizing the light transmission uniformity, and avoiding problems such as vignetting and color cast at the edge of the field of view caused by a large aperture. However, in a high-temperature and high-humidity environment, the fifth lens, the sixth lens, and the seventh lens are prone to deformation and design gap variation, resulting in a decline in the overall imaging quality. Therefore, by defining the condition "0.75 < EP56 / (d6s - d5s) < 0.95", the positions of the fifth spacer element and the sixth spacer element, and the inner diameter difference between the fifth spacer element and the sixth spacer element are reasonably set, optimizing the bearing arrangements of the fifth, sixth, and seventh lenses, effectively reducing the deformation amount of the fifth or seventh lens in a high-temperature and high-humidity environment, and reducing the problem of imaging quality deterioration caused by lens deformation and gap variation, ensuring the imaging performance stability and structural reliability of the entire lens system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic structural diagram of an imaging lens according to Embodiment 1 of the present application.

[0019] Figure 2 FIG. is a schematic structural diagram of an imaging lens according to Embodiment 2 of the present application.

[0020] Figure 3 FIG. is a schematic structural diagram of an imaging lens according to Embodiment 3 of the present application.

[0021] Figure 4 FIG. shows a schematic diagram of the axial chromatic aberration curve of the imaging lens according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application.

[0022] Figure 5 FIG. shows a schematic diagram of the astigmatism curve of the imaging lens according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application.

[0023] Figure 6 FIG. is a schematic structural diagram of an imaging lens according to Embodiment 4 of the present application.

[0024] Figure 7 FIG. is a schematic structural diagram of an imaging lens according to Embodiment 5 of the present application.

[0025] Figure 8This is a schematic diagram of the imaging lens according to Embodiment Six of this application.

[0026] Figure 9 A schematic diagram of the on-axis chromatic aberration curve of the imaging lens according to Embodiments 4, 5 and 6 of this application is shown.

[0027] Figure 10 A schematic diagram of the astigmatism curves of the imaging lenses of Embodiments 4, 5, and 6 according to this application is shown.

[0028] Figure 11 This is a schematic diagram of the imaging lens according to Embodiment Seven of this application.

[0029] Figure 12 This is a schematic diagram of the imaging lens according to Embodiment 8 of this application.

[0030] Figure 13 This is a schematic diagram of the imaging lens according to Embodiment Nine of this application.

[0031] Figure 14 A schematic diagram of the on-axis chromatic aberration curve of the imaging lens according to Embodiment 7, Embodiment 8 and Embodiment 9 of this application is shown.

[0032] Figure 15 A schematic diagram of the astigmatism curves of the imaging lenses of Embodiments 7, 8, and 9 according to this application is shown.

[0033] Figure 16 This is a schematic diagram of partial dimensional parameters of the imaging lens according to one embodiment of this application.

[0034] Figure 17 This is a schematic diagram of another portion of the size parameters of the imaging lens according to one embodiment of this application.

[0035] Figure 18 This is a schematic diagram of an imaging lens, aperture, filter, and image plane according to one embodiment of this application.

[0036] Figure 19 The stress diagram of the imaging lens in Embodiment 7 is shown, which satisfies (f5+f6) / f=6.52, f7 / T67=-83.82, and EP56 / (d6s-d5s)=0.76.

[0037] Figure 20 The stress diagram of the imaging lens is shown when (f5+f6) / f=6.52, f7 / T67=-83.82, and EP56 / (d6s-d5s)=0.63.

[0038] Figure 21 The stress diagram of the imaging lens is shown when (f5+f6) / f=6.52, f7 / T67=-82.82, and EP56 / (d6s-d5s)=1.20. Detailed Implementation

[0039] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0040] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0041] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0042] It should be noted that in this article, the light-transmitting area of ​​a lens is the region on the lens surface that allows light to pass through, which is usually the effective working area of ​​the lens. The non-light-transmitting area of ​​a lens refers to the region on the lens surface that does not participate in imaging or light transmission, usually the edge of the lens and the structural area where it rests with the lens barrel and spacer elements. The effective half-aperture of a lens is the radius of its light-transmitting area.

[0043] In this paper, the paraxial region refers to the area near the optical axis within the light-transmitting region. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region is determined by the sign of the R value (R refers to the radius of curvature of the paraxial region). In this paper, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface. For the object-side surface, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image-side surface, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0044] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] According to one aspect of this application, such as Figure 1As shown, an embodiment of the present application provides an imaging lens, which may include a lens barrel, a lens group, and a plurality of spacer elements accommodated within the lens barrel; the lens group includes a first lens with a positive optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens with a negative optical power; a third lens with a positive optical power; a fourth lens with a negative optical power; a fifth lens with a positive optical power; a sixth lens with a positive optical power, the object side surface of the sixth lens is convex, and the image side surface of the sixth lens is concave; a seventh lens with a negative optical power, the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is concave; the number of lenses with optical power is seven; there is a gap between adjacent two lenses; among the first lens to the seventh lens, at least one surface of each lens has at least one inflection point; the plurality of spacer elements includes a fifth spacer element placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element placed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; the imaging lens further satisfies: 5.95 < (f5 + f6) / f < 7.90; -83.85 ≤ f7 / T67 ≤ -21.20; 0.75 < EP56 / (d6s - d5s) < 0.95; where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, T67 represents the on-axis air gap between the sixth lens and the seventh lens, EP56 is the distance between the fifth spacer element and the sixth spacer element along the optical axis direction, d6s is the inner diameter of the object side surface of the sixth spacer element, and d5s is the inner diameter of the object side surface of the fifth spacer element.

[0048] As Figure 19 Shown in the stress diagram of the imaging lens in an embodiment as shown, when the imaging lens satisfies (f5 + f6) / f = 6.52, f7 / T67 = -83.82, and EP56 / (d6s - d5s) = 0.76, the distance between the image side surface of the fifth spacer element and the object side surface of the sixth spacer element along the optical axis direction is reasonable. After absorbing water and expanding under high temperature and high humidity, the ability of the sixth lens and the seventh lens to resist deformation after arrangement is strong, and the radial deformation of the sixth lens and the seventh lens is small.

[0049] As Figure 20As shown, when the imaging lens satisfies (f5 + f6) / f = 6.52, f7 / T67 = -83.82, and EP56 / (d6s - d5s) = 0.63, the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis decreases, the thickness of the non-light-passing area of the sixth lens decreases, the bearing volume of the non-optics-effective part of the fifth lens increases, and the bending moment under force increases. Under high-temperature and high-humidity conditions, after the fifth lens absorbs water and expands and is squeezed, the upward deformation amount is relatively large. At the same time, the second lens to the fourth lens are also squeezed, the stress increases, and it is easy to cause a decline in the optical performance of the imaging lens.

[0050] As Figure 21 shown, when the imaging lens satisfies (f5 + f6) / f = 6.52, f7 / T67 = -83.82, and EP56 / (d6s - d5s) = 1.20, the distance between the image side of the fifth spacer element and the object side of the sixth spacer element along the optical axis increases, the structural volume of the non-light-passing area of the corresponding sixth lens increases, and the bearing area of the seventh lens arrangement thins. Under high-temperature and high-humidity conditions, the seventh lens absorbs water and expands and is squeezed, resulting in an increase in its upward deformation amount, which is easy to cause a decline in the optical performance of the imaging lens.

[0051] The above high-temperature and high-humidity environment refers to an environment with a temperature of 85°C and a humidity of 85%RH.

[0052] According to some embodiments of the present application, the plurality of spacer elements further includes a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens. The imaging lens further satisfies: -0.60 ≤ f / f2 < -0.25, -6.60 ≤ f2 / d2s < -2.05, where f is the effective focal length of the imaging lens, f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

[0053] By constraining the ratio of the effective focal length of the second lens to the effective focal length of the imaging lens, the light rays are sufficiently diverged after passing through the second lens, but stray light is likely to be generated in the marginal light rays after divergence. By constraining the ratio of the effective focal length of the second lens to the inner diameter of the object side of the second spacer element, the aperture of the second spacer element is effectively constrained, which is beneficial to intercepting the redundant marginal light rays refracted by the second lens and reducing the risk of stray light.

[0054] According to some embodiments of the present application, the plurality of spacer elements further includes a second spacer element disposed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side surface of the third lens. The imaging lens further satisfies: 9.65 < f3 / EP23 ≤ 11.30, where f3 is the effective focal length of the third lens, and EP23 is the interval distance between the second spacer element and the third spacer element along the optical axis.

[0055] In this application, EP23 is the maximum thickness of the non-light-transmitting area of the third lens. Controlling its size to match the effective focal length f3 of the third lens can make the overall shape of the third lens symmetrical, facilitate processing, and ensure the feasibility of lens assembly.

[0056] According to some embodiments of the present application, the imaging lens further satisfies: 2.45 < f6 / d6s ≤ 4.55, where f6 is the effective focal length of the sixth lens, and d6s is the inner diameter of the object side of the sixth spacer element.

[0057] By restricting the ratio of the effective focal length of the sixth lens to the inner diameter of the object side of the sixth spacer element, the aperture through which the light beam passes through the sixth spacer element is defined, the stray light path reflected by the seventh lens can be intercepted, the transmission of stray light between the lenses is reduced, and the imaging contrast is improved.

[0058] According to some embodiments of the present application, the plurality of spacer elements further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens. The imaging lens further satisfies: 2.25 < f4 / (R7 + R8) < 2.85, -1.95 ≤ R8 / d4s < -1.25, where f4 is the effective focal length of the fourth lens, R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer element.

[0059] By controlling the relationship between the effective focal length of the fourth lens, the curvature radius, and the inner diameter of the object side of the fourth spacer element, it is beneficial to optimize the bending shape of the fourth lens, stabilize the light passing diameter after the light passes through the fourth lens, and improve the final imaging clarity of the lens.

[0060] According to some embodiments of the present application, the plurality of spacer elements further includes a first spacer element disposed on the image side of the first lens and in contact with the image side surface of the first lens. The imaging lens further satisfies: 0.75 < f1 / f5 ≤ 1.55, 1.40 < d5s / d1s < 2.05, where f1 is the effective focal length of the first lens, f5 is the effective focal length of the fifth lens, d5s is the inner diameter of the object side of the fifth spacer element, and d1s is the inner diameter of the object side of the first spacer element.

[0061] By controlling the ratio of the effective focal lengths of the first lens and the fifth lens, and the ratio of the inner diameters of the object sides of the fifth spacer element and the first spacer element, the optical power distribution and the matching of the light passing aperture from the first lens to the fifth lens can be optimized. While ensuring the balance of aberration correction of the lens group, the off-axis beam transmission efficiency is guaranteed, and the formation of stray light is suppressed.

[0062] According to some embodiments of the present application, the plurality of spacer elements further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side surface of the fourth lens, and the imaging lens further satisfies: -0.60 ≤ EP45 / (DT52 - d4min) < -0.20, where EP45 is the axial spacing between the fourth spacer element and the fifth spacer element, DT52 is the effective semi-aperture of the image side surface of the fifth lens, and d4min is the minimum inner diameter of the fourth spacer element.

[0063] By restricting the axial spacing between the fourth and fifth spacer elements and the radial aperture difference between the fifth lens and the fourth spacer element, matching the thickness of the non-light-passing area of the fifth lens with the front and rear light-passing apertures, the radial positioning and axial assembly reference of the fifth lens can be stabilized. Meanwhile, the light-passing aperture of the optical light-passing area of the fifth lens can be optimized, the influence of off-axis aberration on the image plane of the fifth lens can be suppressed, the field curvature can be improved, and the imaging quality of the edge field of view can be enhanced.

[0064] According to some embodiments of the present application, the imaging lens further satisfies: 1.6 ≤ FNO ≤ 1.8, 1.30 < d0s / EPD ≤ 1.55, where FNO is the f-number of the imaging lens, d0s is the inner diameter of the object side end face of the lens barrel, and EPD is the entrance pupil diameter of the imaging lens.

[0065] This application is a large-aperture lens. By restricting 1.30 < d0s / EPD ≤ 1.55, the light-passing amount of the lens barrel and the structural compactness are effectively balanced, avoiding light-passing limitation caused by too small an aperture or volume redundancy caused by too large an aperture.

[0066] According to some embodiments of the present application, the imaging lens further satisfies: 2.75 < f6 / R12 < 9.90, 0.65 < EP56 / (CT6 + T67) < 1.15, where f6 is the effective focal length of the sixth lens, R12 is the curvature radius of the image side surface of the sixth lens, EP56 is the axial spacing between the fifth spacer element and the sixth spacer element, CP6 is the maximum thickness of the sixth spacer element along the optical axis direction, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

[0067] The sixth lens is a key aberration correction lens in the rear section of the lens. To meet the requirements of aberration correction, its shape is constrained by the limitation of 2.75 < f6 / R12 < 9.90. However, this is likely to cause stress concentration during the processing of the sixth lens, which in turn leads to lens displacement and a decline in the imaging quality of the system. In this application, by constraining the ratio range of EP56 / (CP6 + T67), the thickness of the non-light-passing area of the sixth lens is controlled, effectively ensuring the stability of its overall structural form, avoiding stress concentration and the resulting lens displacement problems, ensuring the stable performance of the correction function of the sixth lens, and ultimately maintaining the high imaging quality of the lens.

[0068] According to some embodiments of the present application, the imaging lens further satisfies: 2.80 < d6s / YC62 < 3.50, where d6s is the inner diameter of the object side of the sixth spacer element, and YC62 is the perpendicular distance from the critical point closest to the optical axis on the image side of the sixth lens to the optical axis.

[0069] Reasonably setting the value of this conditional expression within the limited range effectively balances the optical performance and mechanical structure design of the sixth lens, ensures the matching of the inner diameter size of the sixth spacer element with the lens performance, and guarantees the assembly feasibility of the sixth lens and the effective light beam passing efficiency.

[0070] According to some embodiments of the present application, the imaging lens further satisfies: -3.95 < (f7 × N7) / OD7 ≤ -2.10, where f7 is the effective focal length of the seventh lens, OD7 is the maximum outer diameter of the seventh lens, and N7 is the refractive index of the seventh lens.

[0071] In this application, the seventh lens is a high-refractive-index lens. By controlling the ratio of (f7 × N7) / OD7, the light passing ability of the seventh lens is effectively improved, the incident angle of the final chief ray is optimized, and the aberration is corrected, reducing the processing and assembly difficulty of the seventh lens.

[0072] According to some embodiments of the present application, the imaging lens further satisfies: 8.70 < (YC71 + YC72) / SAG72 < 23.05, where YC71 is the perpendicular distance from the critical point closest to the optical axis on the object side of the seventh lens to the optical axis, YC72 is the perpendicular distance from the critical point closest to the optical axis on the image side of the seventh lens to the optical axis, and SAG72 is the displacement along the optical axis from the intersection of the image side of the seventh lens and the optical axis to the vertex of the effective semi-aperture of the image side of the seventh lens.

[0073] By constraining the distances from the critical points on both sides of the seventh lens to the optical axis and the sag of the image side, it is beneficial to avoid the vignetting effect (vignetting) and correct aberrations, ensuring the imaging uniformity of the entire field of view.

[0074] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the imaging lens can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, as needed, the imaging lens may also include other numbers of spacers than those described in the above embodiments.

[0075] The following is a reference to the appendix. Figure 18 The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail. For ease of description, in the following embodiments, OBJ represents the object plane of the imaging lens, STO represents the surface of the aperture stop, S1 represents the object-side plane of the first lens E1, S2 represents the image-side plane of the first lens E1, S3 represents the object-side plane of the second lens E2, S4 represents the image-side plane of the second lens E2, S5 represents the object-side plane of the third lens E3, S6 represents the image-side plane of the third lens E3, S7 represents the object-side plane of the fourth lens E4, S8 represents the image-side plane of the fourth lens E4, S9 represents the object-side plane of the fifth lens E5, S10 represents the image-side plane of the fifth lens E5, S11 represents the object-side plane of the sixth lens E6, S12 represents the image-side plane of the sixth lens E6, S13 represents the object-side plane of the seventh lens E7, S14 represents the image-side plane of the seventh lens E7, S15 represents the object-side plane of the filter E8, S16 represents the image-side plane of the filter E8, and S17 represents the image plane.

[0076] Example 1 like Figure 1 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0077] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0078] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave; the second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave; the third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave; the fourth lens E4 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave; Side surface S7 is concave, and the image-side surface S8 of the fourth lens E4 is convex; the fifth lens E5 has positive optical power, and the object-side surface S9 of the fifth lens E5 is convex, while the image-side surface S10 of the fifth lens E5 is concave; the sixth lens E6 has positive optical power, and the object-side surface S11 of the sixth lens E6 is convex, while the image-side surface S12 of the sixth lens E6 is concave; the seventh lens E7 has negative optical power, and the object-side surface S13 of the seventh lens E7 is convex, while the image-side surface S14 of the seventh lens E7 is concave.

[0079] In addition, Table 1 shows the basic optical parameters of the imaging lens of Embodiment 1, wherein the units of radius of curvature and center thickness / gap are millimeters (mm).

[0080] Table 1

[0081] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: ; Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 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 aspherical mirrors S1 to S14 in Example 1.

[0082] Table 2

[0083] Example 2 like Figure 2 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0084] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0085] It is worth noting that, compared with Embodiment 1 above, the imaging lens of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the imaging lens of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the imaging lens of Embodiment 2 has different structural parameters from the imaging lens of Embodiment 1 above. That is, the difference between Embodiment 2 and Embodiment 1 above is that at least some of the structural parameters of the lens barrel and multiple spacer elements in the imaging lens have different dimensional values.

[0086] Example 3 like Figure 3As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0087] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0088] It is worth noting that, compared with Embodiment 1 above, the imaging lens of Embodiment 3 has the same optical parameters, that is, the basic optical parameter table of the imaging lens of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Table 2. However, the imaging lens of Embodiment 3 has different structural parameters than the imaging lens of Embodiment 1 above. That is, the difference between Embodiment 3 and Embodiment 1 above is that at least some of the structural parameters of the lens barrel and multiple spacer elements in the imaging lens have different dimensional values.

[0089] The on-axis chromatic aberration curves of the imaging lenses in Examples 1, 2, and 3 are as follows: Figure 4 As shown; the astigmatism curves of the imaging lenses in Embodiments 1, 2, and 3 are as follows. Figure 5 As shown. According to Figure 4 and Figure 5 It can be seen that the imaging lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0090] Example 4 like Figure 6 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0091] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0092] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave; the second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave; the third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex; the fourth lens E4 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave; Side surface S7 is concave, and the image-side surface S8 of the fourth lens E4 is convex; the fifth lens E5 has positive optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are concave; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are concave.

[0093] In addition, Table 3 shows the basic optical parameters of the imaging lens of Embodiment 4, where the units for radius of curvature and center thickness / gap are millimeters (mm).

[0094] Table 3

[0095] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 4 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 each aspherical mirror S1 to S14 in Embodiment 4.

[0096] Table 4

[0097] Example 5 like Figure 7 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0098] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0099] It is worth noting that, compared with Embodiment 4 above, the imaging lens of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the imaging lens of Embodiment 5 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the imaging lens of Embodiment 5 has different structural parameters from the imaging lens of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 above is that at least some of the structural parameters of the lens barrel and multiple spacer elements in the imaging lens have different dimensional values.

[0100] Example 6 like Figure 8As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0101] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0102] It is worth noting that, compared with Embodiment 4 above, the imaging lens of Embodiment 6 has the same optical parameters, that is, the basic optical parameter table of the imaging lens of Embodiment 6 is the same as Table 3, and the aspherical coefficient table is the same as Table 4. However, the imaging lens of Embodiment 6 has different structural parameters from the imaging lens of Embodiment 4 above, that is, the difference between Embodiment 6 and Embodiment 4 above is that at least some of the structural parameters of the lens barrel and multiple spacer elements in the imaging lens have different dimensional values.

[0103] The on-axis chromatic aberration curves of the imaging lenses in Examples 4, 5, and 6 are as follows: Figure 9 As shown; the astigmatism curves of the imaging lenses in Examples 4, 5, and 6 are as follows. Figure 10 As shown. According to Figure 9 and Figure 10 It can be seen that the imaging lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0104] Example 7 like Figure 11 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0105] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0106] In this embodiment, the first lens E1 has positive optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave; the second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave; the third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave; the fourth lens E4 has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave; Side surface S7 is concave, and the image-side surface S8 of the fourth lens E4 is convex; the fifth lens E5 has positive optical power, and the object-side surface S9 and the image-side surface S10 of the fifth lens E5 are convex; the sixth lens E6 has positive optical power, and the object-side surface S11 and the image-side surface S12 of the sixth lens E6 are concave; the seventh lens E7 has negative optical power, and the object-side surface S13 and the image-side surface S14 of the seventh lens E7 are concave.

[0107] In addition, Table 5 shows the basic optical parameters of the imaging lens of Embodiment 7, where the units for radius of curvature and center thickness / gap are millimeters (mm).

[0108] Table 5

[0109] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 6 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 each aspherical mirror S1 to S14 in Embodiment 7.

[0110] Table 6

[0111] Example 8 like Figure 12 As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0112] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0113] It is worth noting that, compared with Embodiment 7 above, the imaging lens of Embodiment 8 has the same optical parameters, that is, the basic optical parameter table of the imaging lens of Embodiment 8 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the imaging lens of Embodiment 8 has different structural parameters than the imaging lens of Embodiment 7 above, that is, the difference between Embodiment 8 and Embodiment 7 above is that at least some of the structural parameters of the lens barrel and multiple spacer elements in the imaging lens have different dimensional values.

[0114] Example 9 like Figure 13As shown, in this embodiment, the imaging lens includes a lens barrel P0 and a lens group and a plurality of spacer elements housed within the lens barrel P0; the lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 arranged sequentially along the optical axis from the object side to the image side.

[0115] In this embodiment, the plurality of spacers include a first spacer P1 placed on the image side of the first lens E1 and in contact with the image side surface S2 of the first lens E1, a second spacer P2 placed on the image side of the second lens E2 and in contact with the image side surface S4 of the second lens E2, a third spacer P3 placed on the image side of the third lens E3 and in contact with the image side surface S6 of the third lens E3, a fourth spacer P4 placed on the image side of the fourth lens E4 and in contact with the image side surface S8 of the fourth lens E4, a fifth spacer P5 placed on the image side of the fifth lens E5 and in contact with the image side surface S10 of the fifth lens E5, a sixth spacer P6 placed on the image side of the sixth lens E6 and in contact with the image side surface S12 of the sixth lens E6, and a seventh spacer P7 placed on the image side of the seventh lens E7 and in contact with the image side surface S14 of the seventh lens E7.

[0116] It is worth noting that, compared with Embodiment 7 above, the imaging lens of Embodiment 9 has the same optical parameters, that is, the basic optical parameter table of the imaging lens of Embodiment 9 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the imaging lens of Embodiment 9 has different structural parameters than the imaging lens of Embodiment 7 above, that is, the difference between Embodiment 9 and Embodiment 7 above is that at least some of the structural parameters of the lens barrel and multiple spacer elements in the imaging lens have different dimensional values.

[0117] The on-axis chromatic aberration curves of the imaging lenses in Examples 7, 8, and 9 are as follows: Figure 14 As shown; the astigmatism curves of the imaging lenses in Examples 7, 8, and 9 are as follows. Figure 15 As shown. According to Figure 14 and Figure 15 It can be seen that the imaging lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0118] In summary, combining Figure 16 and Figure 17In Embodiments 1 to 9, the effective focal lengths f1 to f7 of the first lens E1 to the seventh lens E7 in the imaging lens, the effective focal length f of the imaging lens, half of the maximum field of view (Semi-FOV) of the imaging lens, the aperture number FNO of the imaging lens, the entrance pupil diameter EPD of the imaging lens, the vertical distance YC62 from the critical point closest to the optical axis on the image side of the sixth lens, the vertical distance YC71 from the critical point closest to the optical axis on the object side of the seventh lens, the vertical distance YC72 from the critical point closest to the optical axis on the image side of the seventh lens, the displacement SAG72 from the intersection of the image side of the seventh lens and the optical axis to the vertex of the effective half-aperture of the image side of the seventh lens along the optical axis, and the effective half-aperture DT52 of the image side of the fifth lens are shown in Table 7 below.

[0119] Table 7

[0120] In addition, the structural parameters of the imaging lenses in Examples 1 to 9 are shown in Table 8, with the unit being millimeters (mm).

[0121] Table 8

[0122] The meanings of the structural parameters in Table 8 are summarized as follows: d1s represents the inner diameter of the object side of the first spacer element, d2s represents the inner diameter of the object side of the second spacer element, d4s represents the inner diameter of the object side of the fourth spacer element, d5s represents the inner diameter of the object side of the fifth spacer element, d6s represents the inner diameter of the object side of the sixth spacer element, d0s represents the inner diameter of the object side end face of the lens barrel, EP23 represents the spacing distance between the second and third spacer elements along the optical axis, EP45 represents the spacing distance between the fourth and fifth spacer elements along the optical axis, EP56 represents the spacing distance between the fifth and sixth spacer elements along the optical axis, CP6 represents the maximum thickness of the sixth spacer element along the optical axis, d4min represents the minimum inner diameter of the fourth spacer element, which can be located on the object side, image side, or between the object side and image side of the fourth spacer element, that is, the inner diameter value of the projection of the fourth spacer element along the optical axis, and OD7 is the maximum outer diameter of the seventh lens.

[0123] In summary, the imaging lenses in Examples 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0124] Table 9

[0125] It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned imaging lens and a photosensitive element, the photosensitive element being disposed on the image side of the imaging lens for imaging. It is understood that the photosensitive element mentioned in this application may, but is not limited to, be implemented as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device, and this application will not elaborate further on this.

[0126] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. The camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

[0127] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An imaging lens, characterized in that: It includes a lens barrel, a lens group and a plurality of spacer elements accommodated within the lens barrel; The lens group includes, arranged in sequence from the object side to the image side along the optical axis: A first lens with a positive optical power, the object side surface of the first lens being convex and the image side surface of the first lens being concave; A second lens with a negative optical power; A third lens with a positive optical power; A fourth lens with a negative optical power; A fifth lens with a positive optical power; A sixth lens with a positive optical power, the object side surface of the sixth lens being convex and the image side surface of the sixth lens being concave; A seventh lens with a negative optical power, the object side surface of the seventh lens being convex and the image side surface of the seventh lens being concave; The number of lenses with optical power is seven; There is a gap between two adjacent lenses; Among the first lens to the seventh lens, at least one surface of each lens has at least one inflection point; The plurality of spacer elements includes a fifth spacer element placed on the image side of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element placed on the image side of the sixth lens and in contact with the image side surface of the sixth lens; The imaging lens further satisfies: 5.95 < (f5 + f6) / f < 7.90; -83.85 ≤ f7 / T67 ≤ -21.20; 0.75 < EP56 / (d6s - d5s) < 0.95; Where, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, T67 represents the on-axis air gap between the sixth lens and the seventh lens, EP56 is the spacing distance between the fifth spacer element and the sixth spacer element along the optical axis direction, d6s is the inner diameter of the object side surface of the sixth spacer element, and d5s is the inner diameter of the object side surface of the fifth spacer element.

2. The imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a second spacer element placed on the image side of the second lens and in contact with the image side surface of the second lens. The imaging lens further satisfies: -0.60 ≤ f / f2 < -0.25, -6.60 ≤ f2 / d2s < -2.05, where f is the effective focal length of the imaging lens, f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

3. The imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a second spacer element placed on the image side of the second lens and in contact with the image side surface of the second lens, and a third spacer element placed on the image side of the third lens and in contact with the image side surface of the third lens. The imaging lens further satisfies: 9.65 < f3 / EP23 ≤ 11.30, where f3 is the effective focal length of the third lens and EP23 is the spacing distance between the second spacer element and the third spacer element along the optical axis direction.

4. The imaging lens according to claim 1, characterized in that, The imaging lens further satisfies: 2.45 < f6 / d6s ≤ 4.55, where f6 is the effective focal length of the sixth lens and d6s is the inner diameter of the object side surface of the sixth spacer element.

5. The imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image-side surface of the fourth lens. The imaging lens further satisfies: 2.25 < f4 / (R7+R8) < 2.85, -1.95 ≤ R8 / d4s < -1.25, where f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object-side surface of the fourth lens, R8 is the radius of curvature of the image-side surface of the fourth lens, and d4s is the inner diameter of the object-side surface of the fourth spacer element.

6. The imaging lens according to claim 5, characterized in that, The plurality of spacer elements further includes a first spacer element disposed on the image side of the first lens and in contact with the image-side surface of the first lens. The imaging lens further satisfies: 0.75 < f1 / f5 ≤ 1.55, 1.40 < d5s / d1s < 2.05, where f1 is the effective focal length of the first lens, f5 is the effective focal length of the fifth lens, d5s is the inner diameter of the object-side surface of the fifth spacer element, and d1s is the inner diameter of the object-side surface of the first spacer element.

7. The imaging lens according to claim 1, characterized in that, The plurality of spacer elements further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image-side surface of the fourth lens. The imaging lens further satisfies: -0.60 ≤ EP45 / (DT52 - d4min) < -0.20, where EP45 is the axial spacing distance between the fourth spacer element and the fifth spacer element, DT52 is the effective semi-aperture of the image-side surface of the fifth lens, and d4min is the minimum inner diameter of the fourth spacer element.

8. The imaging lens according to claim 1, characterized in that, The imaging lens further satisfies: 1.6 ≤ FNO ≤ 1.8, 1.30 < d0s / EPD ≤ 1.55, where FNO is the f-number of the imaging lens, d0s is the inner diameter of the object-side end face of the lens barrel, and EPD is the entrance pupil diameter of the imaging lens.

9. The imaging lens according to claim 1, characterized in that, The imaging lens further satisfies: 2.75 < f6 / R12 < 9.90, 0.65 < EP56 / (CT6 + T67) < 1.15, where f6 is the effective focal length of the sixth lens, R12 is the radius of curvature of the image-side surface of the sixth lens, EP56 is the axial spacing distance between the fifth spacer element and the sixth spacer element, CP6 is the maximum thickness of the sixth spacer element along the optical axis, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.

10. The imaging lens according to any one of claims 1 to 9, characterized in that, The imaging lens further satisfies: 2.80 < d6s / YC62 < 3.50, where d6s is the inner diameter of the object-side surface of the sixth spacer element, and YC62 is the perpendicular distance from the closest critical point of the image-side surface of the sixth lens to the optical axis to the optical axis.

11. The imaging lens according to any one of claims 1 to 9, characterized in that, The imaging lens further satisfies: -3.95 < (f7×N7) / OD7 < -2.10, where f7 is the effective focal length of the seventh lens, N7 is the refractive index of the seventh lens, and OD7 is the maximum outer diameter of the seventh lens.

12. The imaging lens according to any one of claims 1 to 9, characterized in that, The imaging lens also satisfies: 8.70 < (YC71 + YC72) / SAG72 < 23.05, where YC71 is the vertical distance from the critical point closest to the optical axis on the object side of the seventh lens, YC72 is the vertical distance from the critical point closest to the optical axis on the image side of the seventh lens, N7 is the refractive index of the seventh lens, and SAG72 is the displacement along the optical axis from the intersection of the image side of the seventh lens and the optical axis to the effective half-aperture vertex of the image side of the seventh lens.

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