Imaging lens

Abstract

The present application discloses an imaging lens. The imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; a third lens; a fourth lens with negative optical power, having a convex object side surface and a concave image side surface; a fifth lens; a sixth lens, having a concave image side surface; and a seventh lens. Among them, the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, and the maximum half field of view Semi-FOV of the imaging lens satisfy: 8.0 mm < (f1 + |f7|) × tan(Semi-FOV) < 11.5 mm; half of the image height ImgH corresponding to the maximum field of view of the imaging lens, the entrance pupil diameter EPD of the imaging lens, and the f-number Fno of the imaging lens satisfy: 3.5 < ImgH / EPD × Fno < 5.5; and the distance SAG51 on the optical axis between the intersection point of the object side surface of the fifth lens and the optical axis and the effective diameter vertex of the object side surface of the fifth lens, the distance SAG61 on the optical axis between the intersection point of the object side surface of the sixth lens and the optical axis and the effective diameter vertex of the object side surface of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: -9.0 < (SAG51 + SAG61) / T56 < -2.5.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and specifically, to an imaging lens. Background Art

[0002] In recent years, with the popularity of folding-screen mobile phones, electronic products have also developed towards the trend of good functionality and thin and light appearance. Miniature imaging lenses with good imaging quality have become the mainstream in the current market. However, there is a contradiction between high pixels and short overall lens length in miniature imaging lenses. On the other hand, the improvement of the performance and the reduction of the size of image sensors have also made the design freedom of corresponding lenses smaller and increased the design difficulty of corresponding lenses. Therefore, on the basis of ensuring the miniaturization of the lens, achieving a large field of view angle with a relatively large image plane and having good imaging quality is the main development direction for many current lens manufacturers to enhance their competitiveness. Summary of the Invention

[0003] The present application provides such an imaging lens. The imaging lens sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power; a second lens; a third lens; a fourth lens with negative optical power, whose object side is convex and image side is concave; a fifth lens; a sixth lens, whose image side is concave; and a seventh lens. Among them, the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, and the maximum semi-field of view angle Semi-FOV of the imaging lens satisfy: 8.0 mm < (f1 + |f7|) × tan(Semi-FOV) < 11.5 mm; half of the image height ImgH corresponding to the maximum field of view angle of the imaging lens, the entrance pupil diameter EPD of the imaging lens, and the f-number Fno of the imaging lens satisfy: 3.5 < ImgH / EPD × Fno < 5.5; and the distance SAG51 on the optical axis between the intersection of the object side of the fifth lens and the optical axis and the effective diameter vertex of the object side of the fifth lens, the distance SAG61 on the optical axis between the intersection of the object side of the sixth lens and the optical axis and the effective diameter vertex of the object side of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: -9.0 < (SAG51 + SAG61) / T56 < -2.5.

[0004] In one embodiment, the distance TTL on the optical axis from the object side of the first lens to the imaging plane of the imaging lens, half of the image height ImgH corresponding to the maximum field of view angle of the imaging lens, and the f-number Fno of the imaging lens satisfy: 1.5 < TTL / ImgH × Fno < 3.0.

[0005] In one embodiment, the distance TTL on the optical axis from the object side of the first lens to the imaging plane of the imaging lens, the effective focal length f of the imaging lens, and the maximum semi-field of view angle Semi-FOV of the imaging lens satisfy: 1.0 < TTL / f × Tan(Semi-FOV) < 1.5.

[0006] In one embodiment, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0.5 < R11 / R14 < 2.0.

[0007] In one embodiment, the effective focal length f1 of the first lens, the radius of curvature R1 of the object side surface of the first lens, and the radius of curvature R2 of the image side surface of the first lens satisfy: 2.0 < (f1 / R1)×(R2 / f1) < 4.5.

[0008] In one embodiment, the object side surface of the second lens is convex and the image side surface is concave.

[0009] In one embodiment, the air space T45 on the optical axis between the fourth lens and the fifth lens, the air space T56 on the optical axis between the fifth lens and the sixth lens, the air space T67 on the optical axis between the sixth lens and the seventh lens, the central thickness CT5 of the fifth lens on the optical axis, and the central thickness CT6 of the sixth lens on the optical axis satisfy: 0.8 < (T45 + T56 + T67) / (CT5 + CT6) < 2.8.

[0010] In one embodiment, the effective semi-aperture DT62 of the image side surface of the sixth lens and the effective semi-aperture DT52 of the image side surface of the fifth lens satisfy: 3.5 < (DT62 + DT52) / (DT62 - DT52) < 10.0.

[0011] In one embodiment, the effective semi-aperture DT62 of the image side surface of the sixth lens, the effective semi-aperture DT52 of the image side surface of the fifth lens, the distance SAG52 on the optical axis between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and the distance SAG62 on the optical axis between the intersection of the image side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image side surface of the sixth lens satisfy: -8.5 < DT52 / SAG52 + DT62 / SAG62 < -5.5.

[0012] In one embodiment, the distance SAG71 on the optical axis between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, the distance SAG72 on the optical axis between the intersection of the image side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image side surface of the seventh lens, and the central thickness CT7 of the seventh lens on the optical axis satisfy: -11.8 < (SAG71 + SAG72) / CT7 < -2.5.

[0013] In one embodiment, the central thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 at the maximum effective radius of the sixth lens satisfy: 2.0 < (CT6 + ET6) / ET6 < 3.8.

[0014] In one embodiment, the effective semi-aperture DT61 of the sixth lens and the edge thickness ET6 at the maximum effective semi-aperture of the sixth lens satisfy: 3.5 < DT61 / ET6 < 12.0.

[0015] In one embodiment, the effective focal length f7 of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: -3.0 < f7 / R14 < -0.5.

[0016] In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens, the central thickness CT5 on the optical axis of the fifth lens, the central thickness CT6 on the optical axis of the sixth lens, and the central thickness CT7 on the optical axis of the seventh lens satisfy: 3.5 < TTL / (CT5 + CT6 + CT7) < 6.0.

[0017] In one embodiment, the central thickness CT5 on the optical axis of the fifth lens, the central thickness CT7 on the optical axis of the seventh lens, the refractive index N5 of the fifth lens, and the refractive index N7 of the seventh lens satisfy: 1.0 < CT5 / CT7 + N5 / N7 < 5.0.

[0018] By setting the object side surface of the fourth lens to be convex and the image side surface to be concave, and setting the image side surface of the sixth lens to be concave, and reasonably matching the relationship between the optical power of the first lens and the seventh lens and the maximum half field of view angle of the imaging lens, and controlling the front sag of the fifth lens and the front sag of the sixth lens and the gap between the two lenses, it can ensure that the lens has good processability. At the same time, it is beneficial to ensure that the chief ray of the imaging lens has a small incident angle when incident on the image surface, improve the relative illumination of the image surface, and make the imaging lens have the advantage of a large image surface; by reasonably controlling the ratio of ImgH, EPD, and Fno, it is beneficial to achieve a larger imaging height while achieving a shorter total optical length TTL, which is beneficial to the miniaturization of the lens and is beneficial to improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 Shows a schematic structural diagram of an imaging lens according to Embodiment 1 of the present application;

[0021] Figures 2A to 2C Respectively show the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 1;

[0022] Figure 3 Shows a schematic structural diagram of an imaging lens according to Embodiment 2 of the present application;

[0023] Figures 4A to 4C respectively show the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 2;

[0024] Figure 5 shows a schematic structural diagram of an imaging lens according to Embodiment 3 of the present application;

[0025] Figures 6A to 6C respectively show the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 3;

[0026] Figure 7 shows a schematic structural diagram of an imaging lens according to Embodiment 4 of the present application;

[0027] Figures 8A to 8C respectively show the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 4;

[0028] Figure 9 shows a schematic structural diagram of an imaging lens according to Embodiment 5 of the present application;

[0029] Figures 10A to 10C respectively show the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 5;

[0030] Figure 11 shows a schematic structural diagram of an imaging lens according to Embodiment 6 of the present application;

[0031] Figures 12A to 12C respectively show the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 6;

[0032] Figure 13 shows a schematic structural diagram of an imaging lens according to Embodiment 7 of the present application; and

[0033] Figures 14A to 14C respectively show the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of the imaging lens of Embodiment 7. Detailed Embodiments

[0034] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present 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.

[0035] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0036] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0037] In this context, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0038] It should also be understood that the terms "comprises", "comprising", "has", "including", and / or "including having", when used in this specification, denote the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0039] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0040] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] The features, principles, and other aspects of the present application will be described in detail below.

[0042] The imaging lens according to an exemplary embodiment of the present application may include seven lenses with optical powers, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. These seven lenses are arranged in sequence along the optical axis from the object side to the image side. There may be a spacing distance between any two adjacent lenses among the first lens to the seventh lens.

[0043] The first lens of the imaging lens according to an exemplary embodiment of the present application may have a positive optical power, and the fourth lens may have a negative optical power. The object side surface of the fourth lens is set as a convex surface, and the image side surface is set as a concave surface. The image side surface of the sixth lens is set as a concave surface. Set the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, the maximum half field of view Semi - FOV of the imaging lens, half of the image height ImgH corresponding to the maximum field of view of the imaging lens, the entrance pupil diameter EPD of the imaging lens, the f - number Fno of the imaging lens, the distance SAG51 on the optical axis between the intersection point of the object side surface of the fifth lens and the optical axis and the effective diameter vertex of the object side surface of the fifth lens, the distance SAG61 on the optical axis between the intersection point of the object side surface of the sixth lens and the optical axis and the effective diameter vertex of the object side surface of the sixth lens, and the air gap T56 between the fifth lens and the sixth lens on the optical axis to satisfy: 8.0mm < (f1 + |f7|)×tan(Semi - FOV) < 11.5mm, 3.5 < ImgH / EPD×Fno < 5.5, and - 9.0 < (SAG51 + SAG61) / T56 < - 2.5. On the one hand, it is beneficial to ensure that the first lens and the seventh lens have good processability, and enable the imaging lens to have the advantage of a large field of view. At the same time, it is beneficial to reduce the incident angle of the chief ray of the imaging lens on the image plane and improve the relative illumination of the image plane. On the other hand, it is beneficial to achieve a larger imaging height while achieving a shorter total optical length TTL, which is beneficial to the miniaturization of the lens and is beneficial to improving the imaging quality. In addition, by controlling the front sag of the fifth lens and the front sag of the sixth lens, as well as the gap between the two lenses, it is beneficial for the chief ray of the imaging lens to have a small incident angle and a high relative illumination when incident on the image plane, and it is also beneficial for the fifth lens and the sixth lens to have better processability.

[0044] In the exemplary embodiment, the first lens may have a positive optical power; the second lens may have a negative optical power; the third lens may have a positive optical power; the fourth lens may have a negative optical power; the fifth lens may have a positive or negative optical power; the sixth lens may have a positive or negative optical power; the seventh lens may have a negative optical power. By reasonably matching the number of lenses, surface shapes, and optical powers, the total optical length of the imaging lens can be effectively reduced, and the system can be ensured to have high imaging quality.

[0045] In the exemplary embodiment, the imaging lens according to an exemplary embodiment of the present application further includes a diaphragm disposed on the object side surface of the first lens.

[0046] In an exemplary embodiment, the imaging lens according to the exemplary embodiment of the present application further includes a diaphragm disposed on the image side surface of the second lens.

[0047] In an exemplary embodiment, the imaging lens according to the present application can satisfy: 1.5 < TTL / ImgH×Fno < 3.0, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens, ImgH is half of the image height corresponding to the maximum field of view angle of the imaging lens, and Fno is the f-number of the imaging lens. Satisfying 1.5 < TTL / ImgH×Fno < 3.0, the ratio between the axial distance from the object side surface of the first lens to the imaging surface and half of the image height corresponding to the maximum field of view angle of the imaging lens is reasonably set to ensure that the imaging lens has the characteristics of being thin and light.

[0048] In an exemplary embodiment, the imaging lens according to the present application can satisfy: 1.0 < TTL / f×Tan(Semi-FOV) < 1.5, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens, f is the effective focal length of the imaging lens, and Semi-FOV is the maximum half field of view angle of the imaging lens. Satisfying 1.0 < TTL / f×Tan(Semi-FOV) < 1.5, the ratio between the axial distance from the object side surface of the first lens to the imaging surface and the maximum half field of view angle of the imaging lens is reasonably set to ensure that the imaging lens meets the requirements of a large image surface and a large field of view angle.

[0049] In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.5 < R11 / R14 < 2.0, where R11 is the radius of curvature of the object side surface of the sixth lens, and R14 is the radius of curvature of the image side surface of the seventh lens. Satisfying 0.5 < R11 / R14 < 2.0, the ratio range of the radius of curvature of the object side surface of the sixth lens and the radius of curvature of the image side surface of the seventh lens is reasonably controlled, which is beneficial to reducing the sensitivity of the imaging lens and is beneficial to realizing the characteristics of a large image surface, a large aperture, and high resolution of the imaging lens.

[0050] In an exemplary embodiment, the imaging lens according to the present application can satisfy: 2.0 < (f1 / R1)×(R2 / f1) < 4.5, where f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object side surface of the first lens, and R2 is the radius of curvature of the image side surface of the first lens. Satisfying 2.0 < (f1 / R1)×(R2 / f1) < 4.5, the product range of the ratio of the effective focal length of the first lens to the radius of curvature of the object side surface of the first lens and the ratio of the radius of curvature of the image side surface of the first lens to the effective focal length of the first lens is reasonably controlled, which is beneficial to controlling the optical effective aperture and surface shape of the first lens, ensuring the processability of the first lens, and reducing the sensitivity of the imaging lens.

[0051] In an exemplary embodiment, the object side surface of the second lens of the imaging lens according to the present application is convex, and the image side surface is concave. This setting is beneficial to correcting the aberration generated by the first lens and improving the performance of the imaging lens.

[0052] In an exemplary embodiment, the imaging lens according to the present application can satisfy: 0.8 < (T45 + T56 + T67) / (CT5 + CT6) < 2.8, where T45 is the air gap between the fourth lens and the fifth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. Satisfying 0.8 < (T45 + T56 + T67) / (CT5 + CT6) < 2.8 and reasonably allocating the central thicknesses of the fifth lens and the sixth lens, the air gaps between the fourth lens and the fifth lens on the optical axis, the air gaps between the fifth lens and the sixth lens on the optical axis, and the air gaps between the sixth lens and the seventh lens on the optical axis can effectively reduce the rear-end size of the imaging lens to ensure the miniaturization of the lens, reduce the system sensitivity, and improve the optical resolution.

[0053] In an exemplary embodiment, the imaging lens according to the present application can satisfy: 3.5 < (DT62 + DT52) / (DT62 - DT52) < 10.0, where DT62 is the effective semi-aperture of the image side surface of the sixth lens, and DT52 is the effective semi-aperture of the image side surface of the fifth lens. Satisfying 3.5 < (DT62 + DT52) / (DT62 - DT52) < 10.0 and reasonably allocating the effective semi-apertures of the image side surfaces of the fifth lens and the sixth lens can ensure that the outer diameter of the image side end of the imaging lens is within a certain range, which is beneficial to the miniaturization of the imaging lens.

[0054] In an exemplary embodiment, the imaging lens according to the present application can satisfy: -8.5 < DT52 / SAG52 + DT62 / SAG62 < -5.5, where DT62 is the effective semi-aperture of the image side surface of the sixth lens, DT52 is the effective semi-aperture of the image side surface of the fifth lens, SAG52 is the distance on the optical axis between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, and SAG62 is the distance on the optical axis between the intersection of the image side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image side surface of the sixth lens. Satisfying -8.5 < DT52 / SAG52 + DT62 / SAG62 < -5.5 is beneficial to reasonably controlling the deflection angle of the chief ray, improving the matching degree between the imaging lens and the chip, and facilitating the adjustment of the structure of the imaging lens.

[0055] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 11.8 < (SAG71 + SAG72) / CT7 < -2.5, where SAG71 is the distance on the optical axis between the intersection of the object side of the seventh lens and the optical axis and the vertex of the effective radius of the object side of the seventh lens, SAG72 is the distance on the optical axis between the intersection of the image side of the seventh lens and the optical axis and the vertex of the effective radius of the image side of the seventh lens, and CT7 is the central thickness of the seventh lens on the optical axis. Satisfying 11.8 < (SAG71 + SAG72) / CT7 < -2.5 can ensure the processability of the seventh lens and reduce the sensitivity of the seventh lens.

[0056] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 2.0 < (CT6 + ET6) / ET6 < 3.8, where CT6 is the central thickness of the sixth lens on the optical axis and ET6 is the edge thickness at the maximum effective radius of the sixth lens. Satisfying 2.0 < (CT6 + ET6) / ET6 < 3.8 is beneficial to reasonably control the thickness ratio of the sixth lens and ensure the processability of the sixth lens.

[0057] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 3.5 < DT61 / ET6 < 12.0, where DT61 is the effective semi-aperture of the sixth lens and ET6 is the edge thickness at the maximum effective semi-aperture of the sixth lens. Satisfying 3.5 < DT61 / ET6 < 12.0 can effectively reduce the rear-end size of the imaging lens, ensure the miniaturization of the lens, and controlling the outer diameter of the rear-end lens helps the assembly of the imaging lens.

[0058] In an exemplary embodiment, the imaging lens according to the present application may satisfy: -3.0 < f7 / R14 < -0.5, where f7 is the effective focal length of the seventh lens and R14 is the curvature radius of the image side of the seventh lens. Satisfying -3.0 < f7 / R14 < -0.5 and reasonably setting the effective focal length of the seventh lens and the curvature radius of the image side of the seventh lens is beneficial to ensuring that the seventh lens has an appropriate optical power, while reducing the angle between the chief ray and the optical axis when it enters the image plane and improving the illuminance of the image plane.

[0059] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 3.5 < TTL / (CT5 + CT6 + CT7) < 6.0, where TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the imaging lens, CT5 is the central thickness of the fifth lens on the optical axis, CT6 is the central thickness of the sixth lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. Satisfying 3.5 < TTL / (CT5 + CT6 + CT7) < 6.0 is beneficial to reducing the sensitivity of the imaging lens and can effectively shorten the total length of the imaging lens.

[0060] In an exemplary embodiment, the imaging lens according to the present application may satisfy: 1.0 < CT5 / CT7 + N5 / N7 < 5.0, where CT5 is the central thickness of the fifth lens on the optical axis, CT7 is the central thickness of the seventh lens on the optical axis, N5 is the refractive index of the fifth lens, and N7 is the refractive index of the seventh lens. Satisfying 1.0 < CT5 / CT7 + N5 / N7 < 5.0 can effectively control the structure of the imaging lens, is beneficial to better balance the aberration of the imaging lens, and is also beneficial to improving the resolution of the system.

[0061] In an exemplary embodiment, at least one of the lens surfaces of each lens among the first lens to the seventh lens is an aspherical lens surface. The present application does not specifically limit the specific numbers of spherical lenses and aspherical lenses. If the resolution quality is the key concern, aspherical lenses can be used for all lenses. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. The characteristics of a spherical lens are that it has a constant curvature from the center to the periphery of the lens. An aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that occurs during imaging as much as possible, thereby improving the imaging quality. Optionally, the object side and the image side of each lens among the first lens to the seventh lens are both aspherical lens surfaces.

[0062] In an exemplary embodiment, the effective focal length f of the imaging lens may be, for example, in the range of 4.4 mm to 5.3 mm, the effective focal length f1 of the first lens may be, for example, in the range of 4.7 mm to 6.1 mm, the effective focal length f2 of the second lens may be, for example, in the range of -23.9 mm to -11.6 mm, the effective focal length f3 of the third lens may be, for example, in the range of 15.5 mm to 43.7 mm, the effective focal length f4 of the fourth lens may be, for example, in the range of -8277.2 mm to -19.9 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of -25.0 mm to 6.4 mm, the effective focal length f6 of the sixth lens may be, for example, in the range of -40.0 mm to 40.0 mm, and the effective focal length f7 of the seventh lens may be, for example, in the range of -4.5 mm to -3.4 mm. The distance TTL from the object side of the first lens to the imaging surface of the imaging lens on the optical axis may satisfy 5.7 mm < TTL < 6.0 mm. The maximum semi-field angle Semi-FOV of the imaging lens may be, for example, in the range of 43° to 48°. Half of the image height ImgH corresponding to the maximum field angle of the imaging lens may be, for example, in the range of 5.1 mm to 5.4 mm.

[0063] In an exemplary embodiment, the imaging lens according to the present application further includes a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0064] The present application provides an imaging lens with characteristics such as a large image plane, high pixels, miniaturization, and high imaging quality. The imaging lens according to the above-described embodiment of the present application can employ multiple lenses, for example, seven lenses as described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the incident light can be effectively converged, the optical total length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the imaging lens more conducive to production and processing. 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 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 embodiment, the imaging lens is not limited to including seven lenses. If necessary, the imaging lens can also include other numbers of lenses.

[0065] The following further describes specific embodiments of the imaging lens applicable to the above-described embodiments with reference to the accompanying drawings.

[0066] Example 1

[0067] The following refers to Figures 1 to 2C Describe the imaging lens according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the imaging lens according to Embodiment 1 of the present application is shown.

[0068] As Figure 1 shown, the imaging lens sequentially includes, from the object side to the image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17. The first lens E1 has a positive optical power, its object surface S1 is a convex surface, and its image surface S2 is a concave surface. The second lens E2 has a negative optical power, its object surface S3 is a convex surface, and its image surface S4 is a concave surface. The third lens E3 has a positive optical power, its object surface S5 is a convex surface, and its image surface S6 is a convex surface. The fourth lens E4 has a negative optical power, its object surface S7 is a convex surface, and its image surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object surface S9 is a concave surface, and its image surface S10 is a convex surface. The sixth lens E6 has a positive optical power, its object surface S11 is a convex surface, and its image surface S12 is a concave surface. The seventh lens E7 has a negative optical power, its object surface S13 is a concave surface, and its image surface S14 is a concave surface. The filter E8 has an object surface S15 and an image surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0069] In this example, the effective focal length f of the imaging lens is 4.60 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.80 mm, half of the image height ImgH corresponding to the maximum field of view angle of the imaging lens is 5.20 mm, the maximum half field of view angle Semi-FOV of the imaging lens is 46.49°, and the f-number Fno of the imaging lens is 1.88.

[0070] Table 1 shows the basic parameter table of the imaging lens of Example 1, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm).

[0071]

[0072]

[0073] Table 1

[0074] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0075]

[0076] where x is the sagitta, the distance from the vertex of the aspherical surface along the optical axis at a position with a height of h; 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 correction coefficient of the i-th order of the aspherical surface. Tables 2-1 and 2-2 below give the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0077] Face number A4 A6 A8 A10 A12 A14 A16 S1 3.39E-02 -3.49E-03 1.95E-02 -2.73E-02 1.86E-02 2.58E-03 -1.28E-02 S2 -1.52E-02 5.98E-03 -2.01E-02 2.95E-02 -1.51E-02 -1.38E-02 2.42E-02 S3 -4.17E-02 4.09E-03 9.64E-02 -2.63E-01 4.65E-01 -5.16E-01 3.46E-01 S4 -3.53E-02 2.09E-02 1.98E-02 4.29E-03 -5.65E-02 9.99E-02 -8.72E-02 S5 -2.95E-02 2.07E-02 -6.59E-02 -7.25E-02 7.60E-01 -2.19E+00 3.67E+00 S6 -6.78E-02 1.07E-01 -3.28E-01 8.39E-01 -1.88E+00 3.31E+00 -4.38E+00 S7 -1.91E-01 2.49E-01 -8.48E-01 2.65E+00 -5.98E+00 9.42E+00 -1.05E+01 S8 -1.54E-01 2.13E-01 -5.81E-01 1.33E+00 -2.19E+00 2.53E+00 -2.07E+00 S9 2.46E-02 6.31E-02 -3.30E-01 7.56E-01 -1.07E+00 1.03E+00 -6.96E-01 S10 5.26E-02 -1.66E-01 1.73E-01 -6.43E-02 -5.44E-02 1.00E-01 -7.64E-02 S11 1.14E-01 -2.32E-01 1.94E-01 -1.15E-01 4.99E-02 -1.56E-02 3.49E-03 S12 1.29E-01 -1.54E-01 8.10E-02 -2.39E-02 1.59E-03 1.97E-03 -1.02E-03 S13 -7.26E-02 9.11E-03 6.61E-03 -4.38E-03 1.45E-03 -3.10E-04 4.53E-05 S14 -3.98E-02 -3.17E-03 9.64E-03 -4.71E-03 1.31E-03 -2.40E-04 3.02E-05

[0078] Table 2-1

[0079]

[0080]

[0081] Table 2-2

[0082] Figure 2A The axial chromatic aberration curve of the imaging lens of Embodiment 1 is shown, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 2B The astigmatism curve of the imaging lens of Embodiment 1 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 2C The lateral chromatic aberration curve of the imaging lens of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 2A to 2C it can be seen that the imaging lens given in Embodiment 1 can achieve good imaging quality.

[0083] Example 2

[0084] The following will refer to Figures 3 to 4C to describe the imaging lens according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 The structural schematic diagram of the imaging lens according to Embodiment 2 of the present application is shown.

[0085] As Figure 3 shown, the imaging lens sequentially includes, from the object side to the image side: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging plane S17. The first lens E1 has a positive optical power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a negative optical power, its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface. The third lens E3 has a positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface. The fourth lens E4 has a negative optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a concave surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a concave surface, and its image side surface S10 is a convex surface. The sixth lens E6 has a positive optical power, its object side surface S11 is a convex surface, and its image side surface S12 is a concave surface. The seventh lens E7 has a negative optical power, its object side surface S13 is a concave surface, and its image side surface S14 is a concave surface. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging plane S17.

[0086] In this example, the effective focal length f of the imaging lens is 4.87 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging plane S17 of the imaging lens) is 5.98 mm, half of the image height corresponding to the maximum field of view angle of the imaging lens ImgH is 5.36 mm, the maximum half field of view angle Semi - FOV of the imaging lens is 47.28°, and the f - number Fno of the imaging lens is 1.88.

[0087] Table 3 shows the basic parameter table of the imaging lens of Example 2, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 4-1 and 4-2 show the high-order term coefficients of the aspherical mirrors that can be used in Example 2, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0088]

[0089]

[0090] Table 3

[0091] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.69E-02 3.95E-02 -1.33E-01 2.98E-01 -4.17E-01 3.69E-01 -2.00E-01 S2 -1.23E-02 -1.52E-02 6.53E-02 -1.74E-01 2.78E-01 -2.71E-01 1.57E-01 S3 -3.79E-02 7.77E-03 4.05E-02 -8.02E-02 1.25E-01 -1.31E-01 8.42E-02 S4 -3.48E-02 3.43E-02 -6.61E-02 2.35E-01 -4.19E-01 4.53E-01 -2.96E-01 S5 -3.82E-02 9.97E-02 -5.55E-01 1.79E+00 -3.87E+00 5.66E+00 -5.60E+00 S6 -6.01E-02 1.15E-01 -5.28E-01 1.87E+00 -4.85E+00 8.85E+00 -1.14E+01 S7 -2.02E-01 4.08E-01 -1.70E+00 5.23E+00 -1.10E+01 1.63E+01 -1.72E+01 S8 -1.63E-01 2.94E-01 -9.87E-01 2.41E+00 -4.03E+00 4.71E+00 -3.91E+00 S9 2.28E-02 3.87E-02 -1.35E-01 1.87E-01 -1.49E-01 7.24E-02 -2.07E-02 S10 5.01E-02 -1.59E-01 1.85E-01 -1.31E-01 5.67E-02 -4.86E-03 -1.20E-02 S11 1.22E-01 -2.57E-01 2.17E-01 -1.29E-01 5.69E-02 -1.83E-02 4.20E-03 S12 1.40E-01 -1.72E-01 9.13E-02 -2.57E-02 1.20E-05 3.37E-03 -1.61E-03 S13 -7.77E-02 1.28E-02 5.13E-03 -4.05E-03 1.45E-03 -3.25E-04 4.96E-05 S14 -5.00E-02 4.62E-03 6.13E-03 -4.20E-03 1.54E-03 -3.78E-04 6.53E-05

[0092] Table 4-1

[0093]

[0094]

[0095] Table 4-2

[0096] Figure 4A shows the axial chromatic aberration curve of the imaging lens of Example 2, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 4B shows the astigmatism curve of the imaging lens of Example 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C shows the lateral chromatic aberration curve of the imaging lens of Example 2, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 4A to 4C it can be seen that the imaging lens given in Example 2 can achieve good imaging quality.

[0097] Example 3

[0098] The following refers to Figures 5 to 6C to describe the imaging lens according to Embodiment 3 of the present application. Figure 5 shows a schematic structural diagram of the imaging lens according to Embodiment 3 of the present application.

[0099] As Figure 5As shown, the imaging lens sequentially includes, from the object side to the image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17. The first lens E1 has a positive optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive optical power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative optical power, its object surface S11 is convex, and its image surface S12 is concave. The seventh lens E7 has a negative optical power, its object surface S13 is concave, and its image surface S14 is concave. The filter E8 has an object surface S15 and an image surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0100] In this example, the effective focal length f of the imaging lens is 4.50 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.84 mm, half of the image height ImgH corresponding to the maximum field of view angle of the imaging lens is 5.30 mm, the maximum semi-field of view Semi-FOV of the imaging lens is 46.97°, and the f-number Fno of the imaging lens is 2.00.

[0101] Table 5 shows the basic parameter table of the imaging lens of Example 3, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 6-1 and 6-2 show the higher-order term coefficients that can be used for each aspherical mirror surface in Example 3, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0102]

[0103]

[0104] Table 5

[0105] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.83E-02 -2.07E-02 8.34E-02 -1.86E-01 2.63E-01 -2.37E-01 1.32E-01 S2 -1.21E-02 -8.97E-03 4.15E-02 -1.11E-01 1.82E-01 -1.88E-01 1.18E-01 S3 -6.62E-02 1.10E-01 -2.97E-01 7.79E-01 -1.32E+00 1.41E+00 -9.22E-01 S4 -4.65E-02 5.24E-02 2.32E-02 -1.97E-01 5.66E-01 -9.36E-01 9.56E-01 S5 -2.94E-02 -9.06E-02 1.03E+00 -6.64E+00 2.70E+01 -7.42E+01 1.43E+02 S6 -6.60E-02 1.53E-01 -7.45E-01 2.38E+00 -5.16E+00 7.69E+00 -7.95E+00 S7 -2.14E-01 6.77E-01 -3.68E+00 1.33E+01 -3.31E+01 5.83E+01 -7.40E+01 S8 -1.23E-01 2.58E-01 -1.14E+00 3.34E+00 -6.79E+00 9.86E+00 -1.03E+01 S9 6.61E-03 -1.04E-02 2.22E-01 -7.74E-01 1.40E+00 -1.62E+00 1.29E+00 S10 6.59E-02 -7.35E-02 3.70E-02 2.35E-02 -6.52E-02 6.98E-02 -4.79E-02 S11 1.18E-01 -2.12E-01 1.87E-01 -1.61E-01 1.12E-01 -5.19E-02 1.35E-02 S12 9.76E-02 -1.45E-01 1.04E-01 -7.91E-02 5.73E-02 -3.11E-02 1.17E-02 S13 -8.89E-02 7.50E-02 -5.80E-02 3.27E-02 -1.30E-02 3.69E-03 -7.49E-04 S14 -9.97E-02 4.62E-02 -1.84E-02 5.74E-03 -1.43E-03 2.87E-04 -4.57E-05

[0106] Table 6-1

[0107]

[0108]

[0109] Table 6-2

[0110] Figure 6A The axial chromatic aberration curve of the imaging lens of Embodiment 3 is shown, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 6B The astigmatism curve of the imaging lens of Embodiment 3 is shown, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 6C The lateral chromatic aberration curve of the imaging lens of Embodiment 3 is shown, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 6A to 6C it can be known that the imaging lens given in Embodiment 3 can achieve good imaging quality.

[0111] Example 4

[0112] The following refers to Figures 7 to 8C the imaging lens according to Embodiment 4 of the present application is described. Figure 7 The structural schematic diagram of the imaging lens according to Embodiment 4 of the present application is shown.

[0113] As Figure 7 shown, the imaging lens sequentially includes, from the object side to the image side: a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17. The first lens E1 has a positive optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive optical power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative optical power, its object surface S11 is convex, and its image surface S12 is concave. The seventh lens E7 has a negative optical power, its object surface S13 is concave, and its image surface S14 is concave. The filter E8 has an object surface S15 and an image surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0114] In this example, the effective focal length f of the imaging lens is 5.00 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.95 mm, half of the image height corresponding to the maximum field of view angle of the imaging lens ImgH is 5.31 mm, the maximum half field of view angle Semi-FOV of the imaging lens is 43.70°, and the f-number Fno of the imaging lens is 1.95.

[0115] Table 7 shows the basic parameter table of the imaging lens of Example 4, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 8-1 and 8-2 show the high-order term coefficients of each aspherical mirror surface that can be used in Example 4, where each aspherical surface type can be defined by formula (1) given in the above Example 1.

[0116]

[0117]

[0118] Table 7

[0119] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.83E-02 -1.86E-02 7.07E-02 -1.47E-01 1.93E-01 -1.60E-01 8.13E-02 S2 -1.02E-02 -3.34E-02 1.62E-01 -4.20E-01 6.41E-01 -5.96E-01 3.30E-01 S3 -4.79E-02 2.29E-02 5.20E-02 -1.41E-01 2.13E-01 -2.00E-01 1.12E-01 S4 -3.55E-02 3.03E-02 4.75E-02 -1.50E-01 2.54E-01 -2.60E-01 1.64E-01 S5 -2.94E-02 -8.68E-02 9.44E-01 -5.79E+00 2.24E+01 -5.90E+01 1.09E+02 S6 -6.40E-02 1.48E-01 -7.13E-01 2.25E+00 -4.79E+00 7.01E+00 -7.11E+00 S7 -1.40E-01 -1.15E-02 5.80E-01 -3.02E+00 8.62E+00 -1.60E+01 2.05E+01 S8 -1.13E-01 5.36E-02 3.70E-02 -5.37E-01 1.55E+00 -2.55E+00 2.80E+00 S9 6.62E-03 -1.04E-02 2.22E-01 -7.74E-01 1.40E+00 -1.62E+00 1.29E+00 S10 6.56E-02 -7.07E-02 2.61E-02 4.63E-02 -9.49E-02 9.55E-02 -6.34E-02 S11 1.14E-01 -2.41E-01 2.26E-01 -1.85E-01 1.29E-01 -7.06E-02 2.97E-02 S12 8.40E-02 -1.29E-01 6.72E-02 -1.95E-02 2.10E-03 1.12E-03 -8.10E-04 S13 -7.51E-02 3.39E-02 -8.17E-03 -9.65E-04 1.30E-03 -4.22E-04 7.81E-05 S14 -9.97E-02 4.62E-02 -1.84E-02 5.74E-03 -1.43E-03 2.87E-04 -4.57E-05

[0120] Table 8-1

[0121]

[0122]

[0123] Table 8-2

[0124] Figure 8A shows the axial chromatic aberration curve of the imaging lens of Example 4, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 8B shows the astigmatism curve of the imaging lens of Example 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C shows the lateral chromatic aberration curve of the imaging lens of Example 4, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 8A to 8C it can be seen that the imaging lens given in Example 4 can achieve good imaging quality.

[0125] Example 5

[0126] The following refers to Figures 9 to 10C to describe the imaging lens according to Embodiment 5 of the present application. Figure 9 shows a schematic structural diagram of the imaging lens according to Embodiment 5 of the present application.

[0127] As Figure 9As shown in the figure, the imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17. The first lens E1 has a positive focal power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative focal power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive focal power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a negative focal power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a negative focal power, its object surface S9 is concave, and its image surface S10 is concave. The sixth lens E6 has a positive focal power, its object surface S11 is convex, and its image surface S12 is concave. The seventh lens E7 has a negative focal power, its object surface S13 is convex, and its image surface S14 is concave. The filter E8 has an object surface S15 and an image surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0128] In this example, the effective focal length f of the imaging lens is 4.80 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.83 mm, half of the image height ImgH corresponding to the maximum field of view angle of the imaging lens is 5.30 mm, the maximum half field of view angle Semi - FOV of the imaging lens is 44.26°, and the f - number Fno of the imaging lens is 1.89.

[0129] Table 9 shows the basic parameter table of the imaging lens of Example 5, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 10 - 1 and 10 - 2 show the high - order term coefficients of the aspherical mirror surfaces that can be used in Example 5, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0130]

[0131]

[0132] Table 9

[0133] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.87E-02 -5.13E-03 1.04E-02 -1.28E-02 7.60E-03 -1.97E-03 -3.57E-04 S2 -2.04E-02 1.02E-02 -1.79E-02 2.46E-02 -2.61E-02 1.74E-02 -6.87E-03 S3 -2.62E-02 1.08E-01 -7.42E-01 4.51E+00 -1.79E+01 4.82E+01 -9.00E+01 S4 -1.66E-02 2.94E-02 3.82E-02 -1.46E-01 2.24E-01 -1.71E-01 4.63E-02 S5 -2.71E-02 4.54E-02 -2.33E-01 7.07E-01 -1.34E+00 1.59E+00 -1.13E+00 S6 -2.40E-02 -2.68E-02 1.03E-01 -2.65E-01 3.76E-01 -3.08E-01 1.34E-01 S7 -7.82E-02 -9.47E-03 4.67E-02 -2.00E-01 4.28E-01 -6.06E-01 5.75E-01 S8 -6.38E-02 -5.96E-02 3.33E-01 -1.05E+00 2.02E+00 -2.53E+00 2.10E+00 S9 -4.33E-02 -1.19E-01 6.00E-01 -1.59E+00 2.83E+00 -3.59E+00 3.32E+00 S10 -1.23E-01 -4.49E-02 1.75E-01 -1.73E-01 3.23E-02 1.09E-01 -1.42E-01 S11 -1.87E-02 -8.15E-02 9.35E-02 -6.64E-02 2.97E-02 -8.65E-03 1.70E-03 S12 1.25E-01 -1.20E-01 7.33E-02 -3.31E-02 1.07E-02 -2.42E-03 3.59E-04 S13 -1.24E-01 -1.46E-03 3.85E-02 -1.94E-02 4.92E-03 -7.51E-04 7.07E-05 S14 -1.71E-01 5.93E-02 -1.34E-02 1.98E-03 -1.80E-04 7.85E-06 1.72E-07

[0134] Table 10 - 1

[0135]

[0136]

[0137] Table 10 - 2

[0138] Figure 10A The axial chromatic aberration curve of the imaging lens of Example 5 is shown, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 10B The astigmatism curve of the imaging lens of Example 5 is shown, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 10C The lateral chromatic aberration curve of the imaging lens of Example 5 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 10A to 10C it can be seen that the imaging lens given in Example 5 can achieve good imaging quality.

[0139] Example 6

[0140] The following refers to Figures 11 to 12C the imaging lens according to Embodiment 6 of the present application is described. Figure 11 The schematic structural diagram of the imaging lens according to Embodiment 6 of the present application is shown.

[0141] As Figure 11 shown, the imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17. The first lens E1 has a positive optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a negative optical power, its object surface S9 is concave, and its image surface S10 is concave. The sixth lens E6 has a positive optical power, its object surface S11 is convex, and its image surface S12 is convex. The seventh lens E7 has a negative optical power, its object surface S13 is concave, and its image surface S14 is concave. The filter E8 has an object surface S15 and an image surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0142] In this example, the effective focal length f of the imaging lens is 5.01 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.98 mm, half of the image height corresponding to the maximum field of view angle of the imaging lens ImgH is 5.36 mm, the maximum half field of view angle Semi-FOV of the imaging lens is 46.28°, and the f-number Fno of the imaging lens is 1.92.

[0143] Table 11 shows the basic parameter table of the imaging lens of Example 6, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 12-1 and 12-2 show the high-order term coefficients of the aspherical mirrors that can be used in Example 6, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0144]

[0145]

[0146] Table 11

[0147] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.44E-02 1.52E-02 -4.07E-02 6.66E-02 -7.06E-02 4.65E-02 -1.87E-02 S2 -2.05E-02 2.21E-03 1.16E-02 -2.85E-02 3.16E-02 -2.13E-02 8.65E-03 S3 -2.16E-02 8.01E-02 -4.34E-01 2.63E+00 -1.06E+01 2.84E+01 -5.27E+01 S4 -1.47E-02 4.83E-02 -6.25E-02 1.64E-01 -3.73E-01 5.18E-01 -4.14E-01 S5 -2.87E-02 5.60E-02 -2.83E-01 8.19E-01 -1.47E+00 1.62E+00 -1.06E+00 S6 -3.07E-02 -5.37E-03 3.26E-02 -1.23E-01 2.01E-01 -1.82E-01 8.52E-02 S7 -9.14E-02 8.94E-02 -3.93E-01 9.42E-01 -1.45E+00 1.40E+00 -8.20E-01 S8 -6.96E-02 -1.36E-02 1.58E-01 -6.83E-01 1.55E+00 -2.17E+00 1.96E+00 S9 -5.66E-02 -1.55E-02 8.28E-02 -1.25E-01 1.09E-01 -3.37E-02 -7.27E-02 S10 -1.20E-01 -6.75E-02 5.70E-02 2.38E-01 -6.18E-01 7.62E-01 -5.98E-01 S11 1.73E-02 -1.71E-01 1.94E-01 -1.40E-01 6.58E-02 -2.09E-02 4.58E-03 S12 1.51E-01 -1.63E-01 1.10E-01 -5.48E-02 1.99E-02 -5.18E-03 9.49E-04 S13 -1.17E-01 -3.30E-02 7.80E-02 -4.19E-02 1.25E-02 -2.44E-03 3.33E-04 S14 -1.82E-01 6.52E-02 -1.43E-02 2.00E-03 -1.66E-04 5.15E-06 4.49E-07

[0148] Table 12-1

[0149]

[0150]

[0151] Table 12-2

[0152] Figure 12A shows the axial chromatic aberration curve of the imaging lens of Example 6, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 12B shows the astigmatism curve of the imaging lens of Example 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C shows the lateral chromatic aberration curve of the imaging lens of Example 6, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 12A to 12C it can be seen that the imaging lens given in Example 6 can achieve good imaging quality.

[0153] Example 7

[0154] The following refers to Figures 13 to 14C to describe the imaging lens according to Embodiment 7 of the present application. Figure 13 shows a schematic structural diagram of the imaging lens according to Embodiment 7 of the present application.

[0155] As Figure 13As shown in the figure, the imaging lens sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17. The first lens E1 has a positive focal power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative focal power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive focal power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a negative focal power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a negative focal power, its object surface S9 is convex, and its image surface S10 is concave. The sixth lens E6 has a positive focal power, its object surface S11 is convex, and its image surface S12 is concave. The seventh lens E7 has a negative focal power, its object surface S13 is convex, and its image surface S14 is concave. The filter E8 has an object surface S15 and an image surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0156] In this example, the effective focal length f of the imaging lens is 5.20 mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.98 mm, half of the image height ImgH corresponding to the maximum field of view angle of the imaging lens is 5.25 mm, the maximum half field of view angle Semi - FOV of the imaging lens is 44.71°, and the f - number Fno of the imaging lens is 2.05.

[0157] Table 13 shows the basic parameter table of the imaging lens of Example 7, where the units of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 14 - 1 and 14 - 2 show the higher - order term coefficients of the aspherical mirror surfaces that can be used in Example 7, and each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0158]

[0159]

[0160] Table 13

[0161] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.39E-02 6.43E-02 -3.85E-01 1.48E+00 -3.83E+00 6.95E+00 -8.99E+00 S2 -2.19E-02 1.83E-02 -2.03E-01 1.34E+00 -5.22E+00 1.32E+01 -2.27E+01 S3 -1.63E-02 -1.02E-02 8.11E-01 -7.53E+00 4.15E+01 -1.51E+02 3.78E+02 S4 3.29E-03 -1.65E-01 2.94E+00 -2.57E+01 1.46E+02 -5.69E+02 1.56E+03 S5 -1.25E-02 -2.36E-01 3.70E+00 -3.22E+01 1.78E+02 -6.67E+02 1.75E+03 S6 -3.21E-02 -2.88E-02 6.84E-01 -5.25E+00 2.42E+01 -7.56E+01 1.66E+02 S7 -8.54E-02 2.21E-01 -2.02E+00 1.18E+01 -4.65E+01 1.27E+02 -2.44E+02 S8 -4.70E-02 -1.20E-01 8.39E-01 -3.61E+00 1.04E+01 -2.09E+01 3.03E+01 S9 -4.93E-02 -2.92E-01 1.00E+00 -1.89E+00 2.45E+00 -2.38E+00 1.82E+00 S10 -8.41E-02 -4.13E-01 1.15E+00 -1.78E+00 1.90E+00 -1.47E+00 8.40E-01 S11 5.95E-02 -2.68E-01 3.48E-01 -3.01E-01 1.78E-01 -7.53E-02 2.34E-02 S12 1.47E-01 -2.05E-01 1.84E-01 -1.21E-01 5.77E-02 -2.00E-02 5.07E-03 S13 -9.69E-02 -4.55E-02 7.74E-02 -4.05E-02 1.23E-02 -2.48E-03 3.53E-04 S14 -1.39E-01 3.13E-02 5.61E-03 -7.39E-03 3.06E-03 -7.85E-04 1.39E-04

[0162] Table 14 - 1

[0163] Face number A18 A20 A22 A24 A26 A28 A30 S1 8.39E+00 -5.66E+00 2.73E+00 -9.16E-01 2.03E-01 -2.68E-02 1.59E-03 S2 2.75E+01 -2.36E+01 1.43E+01 -5.98E+00 1.64E+00 -2.67E-01 1.95E-02 S3 -6.69E+02 8.41E+02 -7.48E+02 4.59E+02 -1.86E+02 4.43E+01 -4.75E+00 S4 -3.08E+03 4.35E+03 -4.39E+03 3.08E+03 -1.42E+03 3.90E+02 -4.79E+01 S5 -3.27E+03 4.38E+03 -4.16E+03 2.75E+03 -1.19E+03 3.08E+02 -3.56E+01 S6 -2.61E+02 2.95E+02 -2.38E+02 1.33E+02 -4.89E+01 1.06E+01 -1.04E+00 S7 3.39E+02 -3.39E+02 2.42E+02 -1.20E+02 3.96E+01 -7.75E+00 6.83E-01 S8 -3.16E+01 2.39E+01 -1.29E+01 4.81E+00 -1.18E+00 1.71E-01 -1.11E-02 S9 -1.10E+00 5.25E-01 -1.89E-01 4.88E-02 -8.42E-03 8.64E-04 -3.95E-05 S10 -3.60E-01 1.14E-01 -2.63E-02 4.27E-03 -4.61E-04 2.96E-05 -8.55E-07 S11 -5.43E-03 9.44E-04 -1.21E-04 1.11E-05 -6.89E-07 2.58E-08 -4.41E-10 S12 -9.51E-04 1.32E-04 -1.34E-05 9.68E-07 -4.74E-08 1.41E-09 -1.92E-11 S13 -3.63E-05 2.71E-06 -1.45E-07 5.46E-09 -1.36E-10 2.02E-12 -1.34E-14 S14 -1.75E-05 1.60E-06 -1.04E-07 4.70E-09 -1.41E-10 2.50E-12 -1.99E-14

[0164] Table 14 - 2

[0165] Figure 14AThe axial chromatic aberration curve of the imaging lens of Embodiment 7 is shown, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 14B The astigmatism curve of the imaging lens of Embodiment 7 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 14C The lateral chromatic aberration curve of the imaging lens of Embodiment 7 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 14A to 14C it can be seen that the imaging lens given in Embodiment 7 can achieve good imaging quality.

[0166] In summary, Embodiments 1 to 7 respectively satisfy the relationships shown in Table 15.

[0167]

[0168] Table 15

[0169] The present application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.

[0170] The above description is only the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An imaging lens, characterized in that, Along the optical axis from the object side to the image side, it includes: The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; a third lens element having positive optical power and a convex object-side surface; a fourth lens element having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; Fifth lens; a sixth lens having a convex object-side surface; and The image side surface of the seventh lens element having negative optical power is concave, wherein: The effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, and the maximum half field of view Semi-FOV of the imaging lens satisfy the following conditions: 8.60 mm ≤ (f1 + |f7|) × tan (Semi-FOV) ≤ 11.05 mm; Half of the image height ImgH corresponding to the maximum field angle of the imaging lens, the entrance pupil diameter EPD of the imaging lens, and the aperture number Fno of the imaging lens satisfy the following: 3.91≤ImgH / EPD×Fno≤4.71; and A distance SAG51 on the optical axis from the intersection of the object-side surface of the fifth lens and the optical axis to the vertex of the effective diameter of the object-side surface of the fifth lens, a distance SAG61 on the optical axis from the intersection of the object-side surface of the sixth lens and the optical axis to the vertex of the effective diameter of the object-side surface of the sixth lens, and an air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy the following: -8.50≤(SAG51+SAG61) / T56≤-3.35; The number of lenses having optical power in the imaging lens is seven.

2. The imaging lens according to claim 1, wherein, A distance TTL from the object-side surface of the first lens to the imaging surface of the imaging lens on the optical axis, half the image height ImgH corresponding to the maximum field angle of the imaging lens, and an aperture number Fno of the imaging lens satisfy the following conditions: 2.08≤TTL / ImgH×Fno≤2.

34.

3. The imaging lens according to claim 1, wherein, The distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis, the effective focal length f of the imaging lens, and the maximum half field of view Semi-FOV of the imaging lens satisfy the following conditions: 1.14≤TTL / f×Tan(Semi-FOV)≤1.

39.

4. The imaging lens according to claim 1, wherein, A curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R14 of the image-side surface of the seventh lens satisfy: 1.02≤R11 / R14≤1.

63.

5. The imaging lens according to claim 1, wherein, The effective focal length f1 of the first lens, the curvature radius R1 of the object-side surface of the first lens, and the curvature radius R2 of the image-side surface of the first lens satisfy: 2.43≤(f1 / R1)×(R2 / f1)≤3.

79.

6. The imaging lens according to claim 1, wherein, The air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy the following conditions: 1.27 ≤ (T45 + T56 + T67) / (CT5 + CT6) ≤ 2.34。 7. The imaging lens according to claim 1, wherein, The effective semi-aperture DT62 of the image side of the sixth lens and the effective semi-aperture DT52 of the image side of the fifth lens satisfy: 4.28 ≤ (DT62 + DT52) / (DT62 - DT52) ≤ 9.21。 8. The imaging lens according to claim 1, wherein, The effective semi-aperture DT62 of the image side of the sixth lens, the effective semi-aperture DT52 of the image side of the fifth lens, the distance SAG52 on the optical axis between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens, and the distance SAG62 on the optical axis between the intersection point of the image side of the sixth lens and the optical axis and the vertex of the effective radius of the image side of the sixth lens satisfy: -8.09 ≤ DT52 / SAG52 + DT62 / SAG62 ≤ -6.26。 9. The imaging lens according to any one of claims 1 to 8, wherein, The distance SAG71 on the optical axis between the intersection point of the object side of the seventh lens and the optical axis and the vertex of the effective radius of the object side of the seventh lens, the distance SAG72 on the optical axis between the intersection point of the image side of the seventh lens and the optical axis and the vertex of the effective radius of the image side of the seventh lens, and the center thickness CT7 of the seventh lens on the optical axis satisfy: -11.37 ≤ (SAG71 + SAG72) / CT7 ≤ -3.11。 10. The imaging lens according to any one of claims 1 to 8, wherein, The center thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 at the maximum effective radius of the sixth lens satisfy: 1.64 ≤ (CT6 + ET6) / ET6 ≤ 3.23。 11. The imaging lens according to any one of claims 1 to 8, wherein, The effective semi-aperture DT61 of the sixth lens and the edge thickness ET6 at the maximum effective semi-aperture of the sixth lens satisfy: 4.28 ≤ DT61 / ET6 ≤ 11.48。 12. The imaging lens according to any one of claims 1 to 8, wherein, The effective focal length f7 of the seventh lens and the radius of curvature R14 of the image side of the seventh lens satisfy: -2.06 ≤ f7 / R14 ≤ -1.20。 13. The imaging lens according to any one of claims 1 to 8, wherein, The distance TTL on the optical axis from the object side of the first lens to the imaging plane of the imaging lens, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 4.01 ≤ TTL / (CT5 + CT6 + CT7) ≤ 5.67。 14. The imaging lens according to any one of claims 1 to 8, wherein, The center thickness CT5 of the fifth lens on the optical axis, the center thickness CT7 of the seventh lens on the optical axis, the refractive index N5 of the fifth lens, and the refractive index N7 of the seventh lens satisfy: 1.51 ≤ CT5 / CT7 + N5 / N7 ≤ 4.43。

Images