Imaging lens group

Abstract

The present application discloses a camera lens group, which sequentially includes, from the object side to the image side along the optical axis: a first lens with positive optical power, the object side surface of which is convex; a second lens with optical power; a third lens with optical power, the image side surface of which is concave; a fourth lens with optical power; a fifth lens with optical power; a sixth lens with optical power, the image side surface of which is convex; and a seventh lens with negative optical power, the image side surface of which is concave. Among them, the total effective focal length f of the camera lens group and the entrance pupil diameter EPD of the camera lens group satisfy: f / EPD < 1.6; the maximum field of view FOV of the camera lens group satisfies: tan(FOV) > 12.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to a camera lens assembly. Background Art

[0002] In recent years, with the development of photography technology for portable electronic products such as mobile phones, high-quality lenses for mobile phones and other portable electronic products have become increasingly popular. However, as the thickness of portable electronic products such as mobile phones has been reduced, the total length of the camera lens has been limited, which has increased the difficulty of designing lenses for portable electronic products such as mobile phones.

[0003] At the same time, with the improvement of performance and reduction of pixel size of the photosensitive elements such as CCD (Character Coupled Device) or Complementary Metal Oxide Semiconductor (CMOS) commonly used in the camera lenses of portable electronic products such as mobile phones, the corresponding camera lens groups are required to have higher luminous flux.

[0004] How to miniaturize the camera lens group and increase the amount of light entering so that the camera lens group can clearly image the scene is one of the urgent problems to be solved in the field of lens design. Summary of the invention

[0005] On the one hand, the present application provides a camera lens group, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power, whose object side surface is convex; a second lens with optical power; a third lens with optical power, whose image side surface is concave; a fourth lens with optical power; a fifth lens with optical power; a sixth lens with optical power, whose image side surface is convex; and a seventh lens with negative optical power, whose image side surface is concave.

[0006] In one embodiment, the total effective focal length f of the camera lens group and the entrance pupil diameter EPD of the camera lens group may satisfy: f / EPD<1.6.

[0007] In one embodiment, the maximum field of view FOV of the camera lens group may satisfy: tan(FOV)>12.

[0008] In one embodiment, the F number Fno of the camera lens group, the distance TTL from the object side of the first lens to the imaging surface of the camera lens group on the optical axis, and half the diagonal length of the effective pixel area on the imaging surface of the camera lens group ImgH can satisfy: Fno×TTL / ImgH<2.2mm.

[0009] In one embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the camera lens group may satisfy: 1.2≤f1 / f<2.

[0010] In one embodiment, the effective focal length f1 of the first lens and the effective focal length f7 of the seventh lens may satisfy: -3 < f1 / f7 < -1.9.

[0011] In one embodiment, the radius of curvature R14 of the image side of the seventh lens and the total effective focal length f of the imaging lens group may satisfy: 0.5 < R14 / f < 1.

[0012] In one embodiment, the radius of curvature R12 of the image side of the sixth lens and the radius of curvature R13 of the object side of the seventh lens may satisfy: 0.5 < R12 / R13 < 1.

[0013] In one embodiment, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the total effective focal length f of the imaging lens group may satisfy: 1 < f1234 / f < 1.7.

[0014] In one embodiment, the distance T23 between the second lens and the third lens on the optical axis and the distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 0.5 < T23 / T34 < 1.5.

[0015] In one embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis may satisfy: 1.4 < CT1 / (CT2 + CT3) < 2.

[0016] In one embodiment, the distance SAG71 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 on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: -4.5 < SAG71 / CT7 < -2.

[0017] In one embodiment, the distance SAG32 between the intersection of the image side of the third lens and the optical axis and the vertex of the effective radius of the image side of the third lens on the optical axis and the distance SAG41 between the intersection of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens on the optical axis may satisfy: SAG32 / SAG41 < 0.

[0018] In one embodiment, the effective semi-aperture DT11 of the object side of the first lens and the effective semi-aperture DT72 of the image side of the seventh lens may satisfy: 0.3 < DT11 / DT72 < 0.5.

[0019] In one embodiment, the effective semi-aperture DT12 of the image side of the first lens and the effective semi-aperture DT51 of the object side of the fifth lens may satisfy: 0.5 < DT12 / DT51 < 1.

[0020] In one embodiment, the distance SAG52 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 on the optical axis and the distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens on the optical axis may satisfy: 0.3 < SAG52 / SAG61 < 1.1.

[0021] In one embodiment, the effective semi-aperture DT42 of the image side surface of the fourth lens and the effective semi-aperture DT51 of the object side surface of the fifth lens may satisfy: 0.5 < DT42 / DT51 < 1.

[0022] In one embodiment, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy: 2 < T45 / T56 < 5.

[0023] In one embodiment, the second lens may be made of a glass material.

[0024] In one embodiment, the second lens is made of a glass material, and the refractive index of the second lens is not less than the refractive index of any other lens in the imaging lens group.

[0025] This application uses multiple (e.g., seven) lenses. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the above optical imaging lens group has at least one beneficial effect such as miniaturization, ultra-thinness, large aperture, large image plane, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of this application will become more apparent:

[0027] Figure 1 FIG. shows a schematic structural diagram of an imaging lens group according to Embodiment 1 of this application;

[0028] Figures 2A to 2D FIGS. respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the imaging lens group of Embodiment 1;

[0029] Figure 3 FIG. shows a schematic structural diagram of an imaging lens group according to Embodiment 2 of this application;

[0030] Figures 4A to 4D FIGS. respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the imaging lens group of Embodiment 2;

[0031] Figure 5Shows a schematic structural diagram of the camera lens group according to Embodiment 3 of the present application;

[0032] Figures 6A to 6D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the camera lens group of Embodiment 3;

[0033] Figure 7 Shows a schematic structural diagram of the camera lens group according to Embodiment 4 of the present application;

[0034] Figures 8A to 8D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the camera lens group of Embodiment 4;

[0035] Figure 9 Shows a schematic structural diagram of the camera lens group according to Embodiment 5 of the present application;

[0036] Figures 10A to 10D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the camera lens group of Embodiment 5;

[0037] Figure 11 Shows a schematic structural diagram of the camera lens group according to Embodiment 6 of the present application;

[0038] Figures 12A to 12D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the camera lens group of Embodiment 6;

[0039] Figure 13 Shows a schematic structural diagram of the camera lens group according to Embodiment 7 of the present application;

[0040] Figures 14A to 14D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the camera lens group of Embodiment 7;

[0041] Figure 15 Shows a schematic structural diagram of the camera lens group according to Embodiment 8 of the present application;

[0042] Figures 16A to 16D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the camera lens group of Embodiment 8;

[0043] Figure 17 Shows a schematic structural diagram of the camera lens group according to Embodiment 9 of the present application;

[0044] Figures 18A to 18D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the camera lens group of Embodiment 9;

[0045] Figure 19 Shows a schematic structural diagram of an imaging lens group according to Embodiment 10 of the present application;

[0046] Figures 20A to 20D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the imaging lens group of Embodiment 10;

[0047] Figure 21 Shows a schematic structural diagram of an imaging lens group according to Embodiment 11 of the present application;

[0048] Figures 22A to 22D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the imaging lens group of Embodiment 11;

[0049] Figure 23 Shows a schematic structural diagram of an imaging lens group according to Embodiment 12 of the present application;

[0050] Figures 24A to 24D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the imaging lens group of Embodiment 12. Detailed implementation manners

[0051] 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.

[0052] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. 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.

[0053] In the drawings, for the sake of clarity, the thickness, size, and shape of the lens 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 only for illustration and are not drawn to an exact scale.

[0054] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The 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.

[0055] 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 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.

[0056] Unless otherwise defined, all terms (including technical and scientific terms) used herein 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.

[0057] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0058] The features, principles and other aspects of the present application will be described in detail below.

[0059] The imaging lens group according to an exemplary embodiment of the present application may include seven lenses having optical power, 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.

[0060] In an exemplary embodiment, the first lens may have a positive focal power, and its object side may be convex; the second lens has a positive or negative focal power; the third lens has a positive or negative focal power, and its image side may be concave; the fourth lens has a positive or negative focal power; the fifth lens has a positive or negative focal power; the sixth lens has a positive or negative focal power, and its image side may be convex; the seventh lens may have a negative focal power, and its image side may be concave.

[0061] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: f / EPD < 1.6, where f is the total effective focal length of the imaging lens group, and EPD is the entrance pupil diameter of the imaging lens group. Satisfying f / EPD < 1.6 can increase the light flux of the imaging lens group and enhance the imaging effect of the imaging lens group in a dark environment.

[0062] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: tan(FOV) > 12, where FOV is the maximum field of view angle of the imaging lens group. Satisfying tan(FOV) > 12 enables the imaging lens group to have a sufficiently large field of view angle while being compatible with a sufficiently large field of view range, improving the imaging efficiency.

[0063] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: Fno × TTL / ImgH < 2.2 mm, where Fno is the F-number of the imaging lens group, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the imaging lens group, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the imaging lens group. Satisfying Fno × TTL / ImgH < 2.2 mm enables the imaging lens group to effectively control the size of the imaging lens group while having a large aperture, ensuring the ultra-thin characteristic of the imaging lens group, and being compatible with an ultra-large size photosensitive surface, greatly improving the imaging efficiency.

[0064] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: 1.2 ≤ f1 / f < 2, where f1 is the effective focal length of the first lens, and f is the total effective focal length of the imaging lens group. More specifically, f1 and f may further satisfy: 1.2 ≤ f1 / f < 1.8. Satisfying 1.2 ≤ f1 / f < 2 can reasonably control the negative astigmatism of the first lens, cancel out the negative astigmatism of the first lens with the positive astigmatism generated by the subsequent lenses, and enable the imaging lens group to obtain good imaging quality.

[0065] In an exemplary embodiment, the camera lens group according to the present application may satisfy: -3 < f1 / f7 < -1.9, where f1 is the effective focal length of the first lens and f7 is the effective focal length of the seventh lens. More specifically, f1 and f7 may further satisfy: -2.8 < f1 / f7 < -1.9. Satisfying -3 < f1 / f7 < -1.9 can reduce the deflection angle of light and improve the imaging quality of the camera lens group.

[0066] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.5 < R14 / f < 1, where R14 is the radius of curvature of the image side of the seventh lens and f is the total effective focal length of the camera lens group. More specifically, R14 and f may further satisfy: 0.5 < R14 / f < 0.7. Satisfying 0.5 < R14 / f < 1 is beneficial to the molding and demolding of the seventh lens.

[0067] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.5 < R12 / R13 < 1, where R12 is the radius of curvature of the image side of the sixth lens and R13 is the radius of curvature of the object side of the seventh lens. Satisfying 0.5 < R12 / R13 < 1 can effectively control the structures of the sixth lens and the seventh lens, which is beneficial to the molding and demolding of the sixth lens and the seventh lens.

[0068] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 1 < f1234 / f < 1.7, where f1234 is the combined focal length of the first lens, the second lens, the third lens, and the fourth lens, and f is the total effective focal length of the camera lens group. Satisfying 1 < f1234 / f < 1.7 can obtain reasonable negative astigmatism to offset the positive astigmatism of the subsequent lenses, enabling the camera lens group to obtain good imaging quality.

[0069] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.5 < T23 / T34 < 1.5, where T23 is the axial distance between the second lens and the third lens, and T34 is the axial distance between the third lens and the fourth lens. Satisfying 0.5 < T23 / T34 < 1.5 can not only effectively control the field curvature balance of the camera lens group to make the camera lens group have reasonable field curvature, but also control the axial distance between the second lens and the fourth lens to be uniform and reasonable, which helps to enhance the reliability of the camera lens group.

[0070] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 1.4 < CT1 / (CT2 + CT3) < 2, where CT1 is the central thickness of the first lens on the optical axis, CT2 is the central thickness of the second lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. More specifically, it may further satisfy: 1.4 < CT1 / (CT2 + CT3) < 1.8. Satisfying 1.4 < CT1 / (CT2 + CT3) < 2 can effectively control the field curvature balance of the camera lens group, making the camera lens group have a reasonable field curvature, and can also control the structure of the first lens to be uniform and reasonable, which is helpful for the molding of the first lens.

[0071] In an exemplary embodiment, the camera lens group according to the present application may satisfy: -4.5 < SAG71 / CT7 < -2, where SAG71 is the distance on the optical axis from the intersection of the object side surface of the seventh lens and the optical axis to the vertex of the effective radius of the object side surface of the seventh lens, and CT7 is the central thickness of the seventh lens on the optical axis. Satisfying -4.5 < SAG71 / CT7 < -2 can effectively constrain the weak thickness ratio of the seventh lens, reduce the structural sensitivity of the seventh lens, and is beneficial to the molding and demolding of the seventh lens.

[0072] In an exemplary embodiment, the camera lens group according to the present application may satisfy: SAG32 / SAG41 < 0, where SAG32 is the distance on the optical axis from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens, and SAG41 is the distance on the optical axis from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the effective radius of the object side surface of the fourth lens. Satisfying SAG32 / SAG41 < 0 can reasonably control the weak thickness ratio of the structures of the third lens and the fourth lens, which is helpful for the molding and demolding of the third lens and the fourth lens.

[0073] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.3 < DT11 / DT72 < 0.5, where DT11 is the effective semi-aperture of the object side surface of the first lens, and DT72 is the effective semi-aperture of the image side surface of the seventh lens. Satisfying 0.3 < DT11 / DT72 < 0.5 can effectively control the structural step difference from the first lens to the seventh lens, which is beneficial to the lens group standing.

[0074] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.5 < DT12 / DT51 < 1, where DT12 is the effective semi-aperture of the image side surface of the first lens, and DT51 is the effective semi-aperture of the object side surface of the fifth lens. More specifically, DT12 and DT51 may further satisfy: 0.6 < DT12 / DT51 < 0.9. Satisfying 0.5 < DT12 / DT51 < 1 can effectively control the structural step difference from the first lens to the fifth lens, which is beneficial to the lens group standing.

[0075] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: 0.3 < SAG52 / SAG61 < 1.1, where SAG52 is the distance on the optical axis from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, and SAG61 is the distance 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 radius of the object side surface of the sixth lens. Satisfying 0.3 < SAG52 / SAG61 < 1.1 can reasonably control the structural weak thickness ratio of the fifth lens and the sixth lens, which is helpful for the forming and demolding of the fifth lens and the sixth lens.

[0076] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: 0.5 < DT42 / DT51 < 1, where DT42 is the effective semi-aperture of the image side surface of the fourth lens, and DT51 is the effective semi-aperture of the object side surface of the fifth lens. More specifically, DT42 and DT51 may further satisfy: 0.6 < DT42 / DT51 < 1. Satisfying 0.5 < DT42 / DT51 < 1 can effectively control the structural step difference from the fourth lens to the fifth lens, which is beneficial for lens group erection.

[0077] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: 2 < T45 / T56 < 5, where T45 is the distance between the fourth lens and the fifth lens on the optical axis, and T56 is the distance between the fifth lens and the sixth lens on the optical axis. Satisfying 2 < T45 / T56 < 5 can effectively control the field curvature balance of the imaging lens group, so that the imaging lens group has reasonable field curvature.

[0078] In an exemplary embodiment, the second lens of the imaging lens group according to the present application may be made of glass material. The glass material can provide a high refractive index that cannot be provided by plastic materials. The high refractive index is beneficial to improving the resolution of the imaging lens group, and at the same time helps to improve the temperature drift of the system focal length generated by plastic lenses and enhance the system reliability.

[0079] In an exemplary embodiment, the imaging lens group according to the present application may satisfy: N2 ≥ Ni, where N2 is the refractive index of the second lens, and Ni is the refractive index of the i-th (i = 1, 3, 4, 5, 6, 7) lens. Satisfying N2 ≥ Ni is beneficial to improving the resolution of the imaging lens group and enhancing the reliability of the imaging lens group.

[0080] The present application proposes a seven-piece imaging lens group with high imaging quality and aspherical surfaces. The imaging lens group according to the above-described embodiment of the present application can use multiple lenses, such as the seven lenses 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 group can be reduced, and the processability of the imaging lens group can be improved, making the imaging lens group more conducive to production and processing.

[0081] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspherical mirror surface. Optionally, both the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are aspherical mirror surfaces.

[0082] However, those skilled in the art should understand that without departing from the technical solution claimed in the present application, the number of lenses constituting the imaging lens group 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 group is not limited to including seven lenses. If necessary, the imaging lens group can also include other numbers of lenses.

[0083] The following further describes specific embodiments of the imaging lens group applicable to the above-described embodiment with reference to the accompanying drawings.

[0084] Example 1

[0085] The following refers to Figures 1 to 2D Describe the imaging lens group according to Embodiment 1 of the present application. Figure 1 FIG. shows a schematic structural diagram of the imaging lens group according to Embodiment 1 of the present application.

[0086] As Figure 1 shown, the imaging lens group includes, in order 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.

[0087] The first lens E1 has a positive focal power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative focal power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a positive focal power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive focal power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a negative focal power, its object side S9 is convex, and its image side S10 is concave. The sixth lens E6 has a positive focal power, its object side S11 is convex, and its image side S12 is convex. The seventh lens E7 has a negative focal power, its object side S13 is concave, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0088] Table 1 shows the basic parameter table of the imaging lens group of Example 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0089]

[0090] Table 1

[0091] In this example, the total effective focal length f of the imaging lens group is 4.34 mm, the total length TTL of the imaging lens group (i.e., the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the imaging lens group) is 5.48 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group ImgH is 4.12 mm, and the maximum field of view FOV of the imaging lens group is 85.9°.

[0092] In Example 1, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0093]

[0094] where x is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of 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 correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the higher-order term coefficients A 4 , A 6 , A 8 , A 10 , A 12 , A 14, A 16 , A 18 and A 20 .

[0095] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -4.8185E-03 6.8292E-03 -1.3748E-02 9.2986E-03 2.3460E-03 -8.6815E-03 5.9443E-03 -1.7979E-03 2.0265E-04 S2 -1.7284E-02 -1.8948E-02 5.3258E-02 -1.1624E-01 1.5774E-01 -1.2389E-01 5.5631E-02 -1.3331E-02 1.3212E-03 S3 -1.2184E-02 -1.6138E-03 4.2998E-02 -1.3495E-01 2.1632E-01 -1.9036E-01 9.4178E-02 -2.4531E-02 2.6163E-03 S4 -1.2389E-02 5.6041E-02 -1.5843E-01 3.6994E-01 -6.0255E-01 6.3353E-01 -4.0714E-01 1.4423E-01 -2.1244E-02 S5 -5.7839E-02 2.1792E-02 -3.8186E-02 4.5769E-02 -9.4705E-02 1.4824E-01 -1.3041E-01 6.0149E-02 -1.1007E-02 S6 -4.2566E-02 2.3652E-02 -1.1407E-01 3.4366E-01 -6.5359E-01 7.5489E-01 -5.1362E-01 1.9091E-01 -2.9712E-02 S7 -3.5506E-02 4.0336E-02 -1.9510E-01 5.0091E-01 -8.2528E-01 8.3774E-01 -5.0956E-01 1.6897E-01 -2.3232E-02 S8 -5.3136E-02 4.1901E-02 -1.0875E-01 1.7145E-01 -1.8796E-01 1.3320E-01 -5.8184E-02 1.4096E-02 -1.4281E-03 S9 -1.0057E-01 9.3256E-02 -1.1326E-01 1.0649E-01 -7.1117E-02 3.0896E-02 -8.3085E-03 1.2508E-03 -7.9754E-05 S10 2.7481E-02 -7.6984E-02 6.1844E-02 -2.9224E-02 7.8725E-03 -1.0726E-03 3.0187E-05 8.8056E-06 -7.3876E-07 S11 2.6134E-02 -4.4501E-02 1.2609E-02 3.6834E-03 -4.0580E-03 1.2920E-03 -2.0022E-04 1.5492E-05 -4.8530E-07 S12 1.1910E-01 -7.2810E-02 2.5052E-02 -2.7938E-03 -1.0289E-03 4.1871E-04 -6.1826E-05 4.2362E-06 -1.1178E-07 S13 -2.1776E-02 -5.1631E-02 4.2964E-02 -1.4466E-02 2.7446E-03 -3.1775E-04 2.2447E-05 -8.9666E-07 1.5638E-08 S14 -1.3270E-01 5.1907E-02 -1.8637E-02 5.3129E-03 -1.0944E-03 1.4982E-04 -1.2725E-05 6.0274E-07 -1.2130E-08

[0096] Table 2

[0097] Figure 2A shows the axial chromatic aberration curve of the imaging lens group of Embodiment 1, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 2B shows the astigmatism curve of the imaging lens group of Embodiment 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C shows the distortion curve of the imaging lens group of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2D shows the lateral chromatic aberration curve of the imaging lens group of Embodiment 1, 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 2D it can be seen that the imaging lens group given in Embodiment 1 can achieve good imaging quality.

[0098] Example 2

[0099] The following refers to Figures 3 to 4D to describe the imaging lens group according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 shows a schematic structural diagram of the imaging lens group according to Embodiment 2 of the present application.

[0100] As Figure 3 shown, the imaging lens group 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.

[0101] The first lens E1 has a positive focal power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive focal power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative focal power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive focal power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a negative focal power, its object side S9 is convex, and its image side S10 is concave. The sixth lens E6 has a positive focal power, its object side S11 is convex, and its image side S12 is convex. The seventh lens E7 has a negative focal power, its object side S13 is concave, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0102] In this example, the total effective focal length f of the imaging lens group is 4.34 mm, the total length TTL of the imaging lens group is 5.72 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the imaging lens group is 85.6°.

[0103] Table 3 shows the basic parameter table of the imaging lens group of Example 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 4 shows the higher-order term coefficients of the aspherical mirror surfaces 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.

[0104]

[0105] Table 3

[0106]

[0107]

[0108] Table 4

[0109] Figure 4A shows the axial chromatic aberration curve of the imaging lens group 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 group of Example 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C shows the distortion curve of the imaging lens group of Example 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4D shows the lateral chromatic aberration curve of the imaging lens group of Example 2, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 4A to 4D it can be seen that the imaging lens group given in Example 2 can achieve good imaging quality.

[0110] Example 3

[0111] The following refers to Figures 5 to 6D a camera lens group according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of a camera lens group according to Embodiment 3 of the present application is shown.

[0112] As Figure 5 shown, the camera lens group 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.

[0113] 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 positive optical power, its object surface S3 is convex, and its image surface S4 is convex. The third lens E3 has a negative optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a positive optical power, its object surface S7 is convex, and its image surface S8 is convex. The fifth lens E5 has a negative optical power, its object surface S9 is convex, 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.

[0114] In this example, the total effective focal length f of the camera lens group is 4.08 mm, the total length TTL of the camera lens group is 5.58 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the camera lens group is ImgH = 4.12 mm, and the maximum field of view FOV of the camera lens group is 89.0°.

[0115] Table 5 shows the basic parameter table of the camera lens group of Embodiment 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 6 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 3, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0116]

[0117]

[0118] Table 5

[0119] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.0199E-02 3.9942E-02 -1.1744E-01 1.9269E-01 -1.9511E-01 1.2174E-01 -4.5515E-02 9.2646E-03 -7.8735E-04 S2 -1.7235E-02 -7.0355E-02 1.2884E-01 -2.7258E-01 4.5390E-01 -4.4187E-01 2.4128E-01 -6.9215E-02 8.1332E-03 S3 -6.4793E-04 -6.2489E-02 8.0392E-02 -9.0701E-02 1.9059E-01 -2.4240E-01 1.5435E-01 -4.7753E-02 5.7628E-03 S4 3.3282E-02 -1.2470E-01 2.8284E-01 -4.1405E-01 4.5166E-01 -3.5670E-01 1.7578E-01 -4.5901E-02 4.8868E-03 S5 -1.5778E-02 -1.2391E-01 2.6338E-01 -5.2475E-01 8.1814E-01 -8.4314E-01 5.1833E-01 -1.6886E-01 2.2364E-02 S6 -7.1458E-03 -1.2723E-01 3.4614E-01 -6.9183E-01 9.4103E-01 -8.1996E-01 4.3516E-01 -1.2664E-01 1.5462E-02 S7 -1.4793E-02 6.2827E-02 -2.9881E-01 7.0730E-01 -1.0526E+00 9.8325E-01 -5.6002E-01 1.7607E-01 -2.3154E-02 S8 -4.7318E-02 2.1028E-02 -4.6461E-02 8.2517E-02 -1.0647E-01 8.3696E-02 -3.8534E-02 9.4639E-03 -9.4665E-04 S9 -9.6889E-02 8.1789E-02 -8.8457E-02 7.0339E-02 -3.9573E-02 1.4844E-02 -3.5715E-03 4.9738E-04 -2.9971E-05 S10 -1.5238E-01 1.2972E-01 -9.8960E-02 4.9629E-02 -1.6170E-02 3.4025E-03 -4.4896E-04 3.3978E-05 -1.1281E-06 S11 -4.2010E-02 4.4350E-02 -2.9988E-02 9.5417E-03 -1.6915E-03 7.9969E-05 3.3750E-05 -6.5401E-06 3.5350E-07 S12 1.0438E-01 -7.2857E-02 4.2757E-02 -1.6135E-02 3.4818E-03 -4.1264E-04 2.4189E-05 -4.2765E-07 -9.8364E-09 S13 7.9011E-03 -1.0605E-01 8.3359E-02 -3.0286E-02 6.3613E-03 -8.1765E-04 6.3651E-05 -2.7646E-06 5.1558E-08 S14 -9.1321E-02 9.8710E-03 4.1182E-03 -1.9765E-03 3.6355E-04 -3.4089E-05 1.4975E-06 -1.3088E-08 -6.9442E-10

[0120] Table 6

[0121] Figure 6A Fig. 6 shows the axial chromatic aberration curve of the imaging lens group of Embodiment 3, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 6B Fig. 7 shows the astigmatism curve of the imaging lens group of Embodiment 3, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 6C Fig. 8 shows the distortion curve of the imaging lens group of Embodiment 3, which represents the distortion values corresponding to different image heights. Figure 6D Fig. 9 shows the longitudinal chromatic aberration curve of the imaging lens group of Embodiment 3, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 6A to 6D it can be seen that the imaging lens group given in Embodiment 3 can achieve good imaging quality.

[0122] Example 4

[0123] The following refers to Figures 7 to 8D to describe the imaging lens group according to Embodiment 4 of the present application. Figure 7 Fig. 10 shows a schematic structural diagram of the imaging lens group according to Embodiment 4 of the present application.

[0124] As Figure 7 shown, the imaging lens group 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.

[0125] The first lens E1 has a positive optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative optical power, its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative optical power, its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0126] In this example, the total effective focal length f of the imaging lens group is 4.08 mm, the total length TTL of the imaging lens group is 5.58 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the imaging lens group is 89.1°.

[0127] Table 7 shows the basic parameter table of the imaging lens group of Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 8 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 4, and each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0128]

[0129] Table 7

[0130]

[0131]

[0132] Table 8

[0133] Figure 8A shows the axial chromatic aberration curve of the imaging lens group of Embodiment 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 group of Embodiment 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C shows the distortion curve of the imaging lens group of Embodiment 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8D shows the longitudinal chromatic aberration curve of the imaging lens group of Embodiment 4, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. According to Figures 8A to 8D it can be seen that the imaging lens group given in Embodiment 4 can achieve good imaging quality.

[0134] Example 5

[0135] The following refers to Figures 9 to 10D to describe the imaging lens group according to Embodiment 5 of the present application. Figure 9 shows a schematic structural diagram of the imaging lens group according to Embodiment 5 of the present application.

[0136] As Figure 9 shown, the imaging lens group 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.

[0137] The first lens E1 has a positive optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a negative optical power, its object side S9 is convex, and its image side S10 is concave. The sixth lens E6 has a positive optical power, its object side S11 is convex, and its image side S12 is convex. The seventh lens E7 has a negative optical power, its object side S13 is concave, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface S17.

[0138] In this example, the total effective focal length f of the imaging lens group is 4.33 mm, the total length TTL of the imaging lens group is 5.70 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the imaging lens group is 85.7°.

[0139] Table 9 shows the basic parameter table of the imaging lens group of Example 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 10 shows the higher-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.

[0140]

[0141] Table 9

[0142] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -6.2595E-03 1.8733E-02 -4.9808E-02 7.1912E-02 -6.4376E-02 3.5450E-02 -1.1677E-02 2.0592E-03 -1.4760E-04 S2 -2.4232E-02 -9.3257E-02 1.8748E-01 -1.9402E-01 1.4137E-01 -7.9779E-02 3.2510E-02 -8.0215E-03 8.6152E-04 S3 -3.1376E-03 -8.9548E-02 2.0999E-01 -2.8821E-01 3.0199E-01 -2.2921E-01 1.1107E-01 -2.9635E-02 3.2736E-03 S4 1.2362E-02 -1.3048E-02 1.1511E-03 1.0637E-01 -3.0206E-01 3.9104E-01 -2.7510E-01 1.0194E-01 -1.5405E-02 S5 -4.5173E-02 -2.2351E-02 1.0484E-01 -3.1474E-01 5.1554E-01 -4.9653E-01 2.7920E-01 -8.2802E-02 9.9304E-03 S6 -4.2378E-02 -3.5014E-02 1.2554E-01 -2.7130E-01 3.4302E-01 -2.5567E-01 1.0939E-01 -2.2931E-02 1.5447E-03 S7 -3.1213E-02 8.3678E-02 -3.1439E-01 6.8353E-01 -9.5721E-01 8.4898E-01 -4.6135E-01 1.3917E-01 -1.7668E-02 S8 -5.0880E-02 3.8603E-02 -8.8313E-02 1.4057E-01 -1.5521E-01 1.0811E-01 -4.5318E-02 1.0373E-02 -9.8619E-04 S9 -9.1337E-02 7.3315E-02 -6.8779E-02 4.8213E-02 -2.5099E-02 9.1144E-03 -2.2823E-03 3.5346E-04 -2.4277E-05 S10 -6.5753E-02 5.9008E-02 -5.0575E-02 2.7869E-02 -9.8528E-03 2.2184E-03 -3.0912E-04 2.4460E-05 -8.4316E-07 S11 -2.4826E-02 2.3472E-02 -2.4723E-02 1.3655E-02 -5.3762E-03 1.3897E-03 -2.1538E-04 1.8347E-05 -6.7153E-07 S12 1.1157E-01 -7.5044E-02 3.7705E-02 -1.1467E-02 1.6368E-03 -8.2146E-06 -2.6668E-05 3.0040E-06 -1.0612E-07 S13 -4.8630E-03 -8.4274E-02 6.7897E-02 -2.4302E-02 4.9914E-03 -6.2699E-04 4.7776E-05 -2.0350E-06 3.7269E-08 S14 -1.0563E-01 2.4545E-02 -4.2770E-03 8.2573E-04 -2.1728E-04 4.1646E-05 -4.5621E-06 2.5904E-07 -5.9451E-09

[0143] Table 10

[0144] Figure 10A Shows the axial chromatic aberration curve of the imaging lens group of Example 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 10B Shows the astigmatism curve of the imaging lens group of Example 5, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10C Shows the distortion curve of the imaging lens group of Example 5, which represents the distortion magnitude values corresponding to different image heights. Figure 10D Shows the lateral chromatic aberration curve of the imaging lens group of Example 5, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 10A to 10D It can be seen that the imaging lens group given in Example 5 can achieve good imaging quality.

[0145] Example 6

[0146] The following is a reference to Figures 11 to 12D a camera lens group according to Embodiment 6 of the present application is described. Figure 11 A schematic structural diagram of the camera lens group according to Embodiment 6 of the present application is shown.

[0147] As Figure 11 shown, the camera lens group 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.

[0148] 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 negative optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a positive optical power, its object surface S7 is concave, and its image surface S8 is convex. The fifth lens E5 has a negative optical power, its object surface S9 is convex, 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.

[0149] In this example, the total effective focal length f of the camera lens group is 4.19 mm, the total length TTL of the camera lens group is 5.58 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the camera lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the camera lens group is 87.6°.

[0150] Table 11 shows the basic parameter table of the camera lens group of Embodiment 6, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 12 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 6, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0151]

[0152]

[0153] Table 11

[0154] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -6.6254E-03 2.7501E-02 -7.8983E-02 1.2534E-01 -1.2243E-01 7.3382E-02 -2.6252E-02 5.0579E-03 -4.0048E-04 S2 -3.0109E-02 -1.2650E-01 2.9642E-01 -4.1194E-01 4.4259E-01 -3.4469E-01 1.7041E-01 -4.6534E-02 5.2975E-03 S3 -1.5853E-02 -1.0431E-01 2.9134E-01 -4.7001E-01 5.6989E-01 -4.7654E-01 2.4443E-01 -6.7731E-02 7.7161E-03 S4 5.8770E-04 -1.1129E-02 5.2126E-02 -3.8256E-02 -8.7201E-02 2.0294E-01 -1.8158E-01 7.8382E-02 -1.3189E-02 S5 -4.0475E-02 -1.5592E-02 6.1015E-02 -2.4087E-01 4.6185E-01 -4.9179E-01 2.9684E-01 -9.2911E-02 1.1659E-02 S6 -3.4756E-02 -6.5954E-02 2.2324E-01 -5.2569E-01 7.6558E-01 -6.8197E-01 3.6466E-01 -1.0640E-01 1.3010E-02 S7 -1.9709E-02 3.5723E-02 -1.9544E-01 4.8396E-01 -7.3911E-01 6.9211E-01 -3.8819E-01 1.1837E-01 -1.4891E-02 S8 -4.6082E-02 4.4871E-02 -1.3651E-01 2.3407E-01 -2.5065E-01 1.6458E-01 -6.4704E-02 1.3901E-02 -1.2462E-03 S9 -9.8865E-02 8.8854E-02 -9.5382E-02 7.4253E-02 -4.0501E-02 1.4826E-02 -3.5134E-03 4.8460E-04 -2.8978E-05 S10 -6.6890E-02 7.0519E-02 -6.2194E-02 3.3221E-02 -1.1084E-02 2.3367E-03 -3.0489E-04 2.2636E-05 -7.3373E-07 S11 -4.2424E-02 4.4979E-02 -3.1672E-02 1.2554E-02 -3.5189E-03 6.8976E-04 -8.7273E-05 6.4754E-06 -2.1878E-07 S12 8.8960E-02 -5.7605E-02 3.1004E-02 -9.8516E-03 1.4552E-03 -2.6919E-05 -1.8497E-05 2.1227E-06 -7.3592E-08 S13 -7.4523E-03 -7.6880E-02 6.1200E-02 -2.1454E-02 4.3101E-03 -5.2961E-04 3.9505E-05 -1.6491E-06 2.9642E-08 S14 -9.4545E-02 1.8578E-02 -2.0454E-03 2.3904E-04 -1.0121E-04 2.5378E-05 -3.0974E-06 1.8412E-07 -4.2980E-09

[0155] Table 12

[0156] Figure 12A Shows the axial chromatic aberration curve of the imaging lens group of Embodiment 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 group of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C Shows the distortion curve of the imaging lens group of Embodiment 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12D Shows the lateral chromatic aberration curve of the imaging lens group of Embodiment 6, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 12A to 12D it can be seen that the imaging lens group given in Embodiment 6 can achieve good imaging quality.

[0157] Example 7

[0158] The following refers to Figures 13 to 14D describes the imaging lens group according to Embodiment 7 of the present application. Figure 13 Shows a schematic structural diagram of the imaging lens group according to Embodiment 7 of the present application.

[0159] As Figure 13 shown, the imaging lens group 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.

[0160] 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 concave 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 convex surface, and its image side surface S10 is a concave 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 convex 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. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0161] In this example, the total effective focal length f of the imaging lens group is 4.34 mm, the total length TTL of the imaging lens group is 5.73 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view FOV of the imaging lens group is 85.5°.

[0162] Table 13 shows the basic parameter table of the imaging lens group of Example 7, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 14 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Example 7, where each aspherical surface type can be defined by Formula (1) given in Example 1 above.

[0163]

[0164] Table 13

[0165]

[0166]

[0167] Table 14

[0168] Figure 14A shows the axial chromatic aberration curve of the imaging lens group of Example 7, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 14B shows the astigmatism curve of the imaging lens group of Example 7, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14C shows the distortion curve of the imaging lens group of Example 7, which represents the distortion magnitude values corresponding to different image heights. Figure 14D shows the lateral chromatic aberration curve of the imaging lens group of Example 7, 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 14D it can be seen that the imaging lens group given in Example 7 can achieve good imaging quality.

[0169] Example 8

[0170] The following refers to Figures 15 to 16D to describe the imaging lens group according to Embodiment 8 of the present application. Figure 15 shows a schematic structural diagram of the imaging lens group according to Embodiment 8 of the present application.

[0171] As Figure 15 shown, the imaging lens group 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.

[0172] The first lens E1 has a positive focal power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a negative focal power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a negative focal power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a positive focal power, with its object side S7 being convex and its image side S8 being concave. The fifth lens E5 has a negative focal power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has a positive focal power, with its object side S11 being convex and its image side S12 being convex. The seventh lens E7 has a negative focal power, with its object side S13 being concave and its image side S14 being concave. The filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0173] In this example, the total effective focal length f of the imaging lens group is 4.19 mm, the total length TTL of the imaging lens group is 5.58 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the imaging lens group is 87.6°.

[0174] Table 15 shows the basic parameter table of the imaging lens group of Example 8, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 16 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 8, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0175]

[0176]

[0177] Table 15

[0178] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -7.1526E-03 2.8306E-02 -8.8918E-02 1.5384E-01 -1.6250E-01 1.0504E-01 -4.0552E-02 8.5171E-03 -7.4779E-04 S2 -4.1989E-02 -6.0345E-02 2.1266E-01 -3.6247E-01 3.9123E-01 -2.6553E-01 1.0890E-01 -2.4673E-02 2.3708E-03 S3 -2.8661E-02 -4.4965E-02 2.4729E-01 -5.3437E-01 6.8430E-01 -5.3185E-01 2.4497E-01 -6.1201E-02 6.3700E-03 S4 -2.6742E-04 -1.3643E-02 1.4787E-01 -3.7745E-01 4.7140E-01 -3.2058E-01 1.0830E-01 -1.0462E-02 -1.5638E-03 S5 -5.1935E-02 -6.6007E-03 9.6499E-02 -3.1565E-01 4.9830E-01 -4.6108E-01 2.5256E-01 -7.3518E-02 8.6571E-03 S6 -5.6291E-02 2.9745E-02 -8.6064E-02 2.0066E-01 -3.2868E-01 3.3499E-01 -2.0012E-01 6.5681E-02 -9.1265E-03 S7 -5.1695E-02 1.7475E-01 -5.3702E-01 1.0398E+00 -1.3137E+00 1.0615E+00 -5.2845E-01 1.4696E-01 -1.7338E-02 S8 -9.0880E-02 1.6407E-01 -3.4956E-01 4.9945E-01 -4.7976E-01 2.9803E-01 -1.1441E-01 2.4527E-02 -2.2270E-03 S9 -1.0195E-01 1.0164E-01 -9.7990E-02 6.5003E-02 -2.9472E-02 8.8743E-03 -1.8802E-03 2.7250E-04 -1.9129E-05 S10 -1.3690E-01 1.1615E-01 -9.1876E-02 5.0602E-02 -1.8341E-02 4.2463E-03 -6.0318E-04 4.7895E-05 -1.6277E-06 S11 -2.6819E-02 2.5057E-02 -2.5296E-02 1.3914E-02 -5.3773E-03 1.3448E-03 -1.9951E-04 1.6097E-05 -5.5349E-07 S12 1.0903E-01 -7.2657E-02 3.7327E-02 -1.1736E-02 1.7998E-03 -4.8504E-05 -2.1572E-05 2.6916E-06 -9.9163E-08 S13 -4.6862E-03 -8.3239E-02 6.6669E-02 -2.3786E-02 4.8808E-03 -6.1405E-04 4.6974E-05 -2.0131E-06 3.7160E-08 S14 -1.0038E-01 2.1341E-02 -2.9520E-03 4.5549E-04 -1.4721E-04 3.2998E-05 -3.9096E-06 2.3188E-07 -5.4647E-09

[0179] Table 16

[0180] Figure 16A shows the axial chromatic aberration curve of the imaging lens group of Example 8, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 16B shows the astigmatism curve of the imaging lens group of Example 8, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16C shows the distortion curve of the imaging lens group of Example 8, which represents the distortion magnitude values corresponding to different image heights. Figure 16D shows the lateral chromatic aberration curve of the imaging lens group of Example 8, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 16A to 16DIt can be seen that the imaging lens group given in Embodiment 8 can achieve good imaging quality.

[0181] Example 9

[0182] The following refers to Figures 17 to 18D and describes an imaging lens group according to Embodiment 9 of the present application. Figure 17 FIG. shows a schematic structural diagram of an imaging lens group according to Embodiment 9 of the present application.

[0183] As Figure 17 shown, the imaging lens group 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.

[0184] The first lens E1 has a positive optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative optical power, its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0185] In this example, the total effective focal length f of the imaging lens group is 4.19 mm, the total length TTL of the imaging lens group is 5.57 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the imaging lens group is 87.5°.

[0186] Table 17 shows the basic parameter table of the imaging lens group of Embodiment 9, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 18 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 9, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0187]

[0188] Table 17

[0189]

[0190]

[0191] Table 18

[0192] Figure 18A shows the axial chromatic aberration curve of the imaging lens group of Example 9, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 18B shows the astigmatism curve of the imaging lens group of Example 9, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 18C shows the distortion curve of the imaging lens group of Example 9, which represents the distortion magnitude values corresponding to different image heights. Figure 18D shows the lateral chromatic aberration curve of the imaging lens group of Example 9, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 18A to 18D it can be seen that the imaging lens group given in Example 9 can achieve good imaging quality.

[0193] Example 10

[0194] The following refers to Figures 19 to 20D describes the imaging lens group according to Embodiment 10 of the present application. Figure 19 shows a schematic structural diagram of the imaging lens group according to Embodiment 10 of the present application.

[0195] As Figure 19 shown, the imaging lens group 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 plane S17.

[0196] The first lens E1 has a positive optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative optical power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is convex. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging plane S17.

[0197] In this example, the total effective focal length f of the imaging lens group is 4.30 mm, the total length TTL of the imaging lens group is 5.66 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the imaging lens group is 86.1°.

[0198] Table 19 shows the basic parameter table of the imaging lens group of Embodiment 10, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 20 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 10, and each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0199]

[0200] Table 19

[0201] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -7.4582E-03 2.5011E-02 -6.5909E-02 9.5906E-02 -8.5954E-02 4.7282E-02 -1.5528E-02 2.7392E-03 -1.9746E-04 S2 -3.9564E-02 -6.1046E-02 1.7396E-01 -2.4253E-01 2.3204E-01 -1.5259E-01 6.4031E-02 -1.5205E-02 1.5395E-03 S3 -2.1951E-02 -4.9888E-02 1.9080E-01 -3.4216E-01 4.0521E-01 -3.1078E-01 1.4526E-01 -3.7084E-02 3.9383E-03 S4 2.0626E-03 1.5188E-02 -3.7702E-02 1.3225E-01 -3.1052E-01 3.9515E-01 -2.7929E-01 1.0398E-01 -1.5750E-02 S5 -4.8007E-02 -1.9699E-02 1.1836E-01 -3.3692E-01 5.0281E-01 -4.4562E-01 2.3519E-01 -6.6257E-02 7.5597E-03 S6 -5.2138E-02 1.3498E-02 -3.2739E-02 7.3742E-02 -1.3860E-01 1.6151E-01 -1.0641E-01 3.8042E-02 -5.6914E-03 S7 -4.9987E-02 1.2515E-01 -3.8620E-01 7.7736E-01 -1.0443E+00 9.0250E-01 -4.8116E-01 1.4297E-01 -1.7935E-02 S8 -8.5760E-02 1.1427E-01 -2.2842E-01 3.1850E-01 -3.0402E-01 1.8841E-01 -7.2129E-02 1.5396E-02 -1.3890E-03 S9 -7.8887E-02 6.3361E-02 -6.8745E-02 5.3191E-02 -2.9044E-02 1.0730E-02 -2.6658E-03 4.0308E-04 -2.6977E-05 S10 -3.6390E-02 2.5475E-02 -3.0046E-02 2.0828E-02 -8.5837E-03 2.1449E-03 -3.2121E-04 2.6689E-05 -9.4907E-07 S11 -1.0860E-02 2.3150E-02 -4.1604E-02 3.0252E-02 -1.3121E-02 3.4444E-03 -5.3157E-04 4.4596E-05 -1.5796E-06 S12 1.0162E-01 -5.4539E-02 1.7528E-02 -8.8348E-04 -1.5582E-03 5.6674E-04 -8.7729E-05 6.5426E-06 -1.9252E-07 S13 -4.7812E-03 -8.3819E-02 6.7454E-02 -2.4144E-02 4.9629E-03 -6.2435E-04 4.7667E-05 -2.0347E-06 3.7342E-08 S14 -1.0408E-01 2.2326E-02 -2.9640E-03 3.3825E-04 -9.9899E-05 2.4336E-05 -3.0763E-06 1.9105E-07 -4.6620E-09

[0202] Table 20

[0203] Figure 20A shows the axial chromatic aberration curve of the imaging lens group of Embodiment 10, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 20B shows the astigmatism curve of the imaging lens group of Embodiment 10, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 20C shows the distortion curve of the imaging lens group of Embodiment 10, which represents the distortion magnitude values corresponding to different image heights. Figure 20D shows the lateral chromatic aberration curve of the imaging lens group of Embodiment 10, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 20A to 20D it can be known that the imaging lens group given in Embodiment 10 can achieve good imaging quality.

[0204] Example 11

[0205] The following refers to Figures 21 to 22D and describes the imaging lens group according to Embodiment 11 of the present application. Figure 21 shows a schematic structural diagram of the imaging lens group according to Embodiment 11 of the present application.

[0206] As Figure 21 shown, the imaging lens group 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.

[0207] The first lens E1 has a positive optical power. Its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive optical power. Its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative optical power. Its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power. Its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a positive optical power. Its object side S9 is convex, and its image side S10 is concave. The sixth lens E6 has a positive optical power. Its object side S11 is concave, and its image side S12 is convex. The seventh lens E7 has a negative optical power. Its object side S13 is concave, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0208] In this example, the total effective focal length f of the imaging lens group is 4.19 mm, the total length TTL of the imaging lens group is 5.58 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view angle FOV of the imaging lens group is 87.7°.

[0209] Table 21 shows the basic parameter table of the imaging lens group of Example 11, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 22 shows the higher-order term coefficients of the aspherical mirror surfaces that can be used in Example 11, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0210]

[0211]

[0212] Table 21

[0213] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -7.9196E-03 2.8780E-02 -7.0400E-02 9.2461E-02 -7.0476E-02 2.9190E-02 -5.1765E-03 -2.3072E-04 1.4234E-04 S2 -3.2849E-02 -1.3583E-01 3.0811E-01 -4.6873E-01 5.6257E-01 -4.6187E-01 2.3064E-01 -6.2534E-02 7.0400E-03 S3 -1.3665E-02 -1.1432E-01 2.9890E-01 -5.2414E-01 7.0428E-01 -6.2130E-01 3.2479E-01 -9.0470E-02 1.0323E-02 S4 1.0736E-02 -1.3028E-02 1.5408E-02 9.7346E-02 -3.4510E-01 4.9234E-01 -3.7365E-01 1.4769E-01 -2.3586E-02 S5 -3.9840E-02 1.0542E-02 -2.1993E-02 -5.9819E-02 1.9750E-01 -2.4639E-01 1.5675E-01 -4.7831E-02 5.4059E-03 S6 -5.1705E-02 -4.4025E-02 2.1788E-01 -5.7661E-01 8.9067E-01 -8.3213E-01 4.6486E-01 -1.4170E-01 1.8094E-02 S7 -2.7930E-02 9.0425E-02 -3.5401E-01 8.0757E-01 -1.1645E+00 1.0496E+00 -5.7358E-01 1.7240E-01 -2.1661E-02 S8 -3.8020E-02 3.1087E-02 -1.5280E-01 3.0541E-01 -3.3983E-01 2.2225E-01 -8.5393E-02 1.7783E-02 -1.5430E-03 S9 -1.1677E-02 -4.4258E-02 2.7373E-02 -4.9902E-03 -5.5321E-03 5.0490E-03 -2.0434E-03 4.1235E-04 -3.2396E-05 S10 5.4699E-02 -7.6364E-02 3.5052E-02 -8.3857E-03 8.9220E-04 3.4942E-05 -2.3849E-05 3.1287E-06 -1.5369E-07 S11 6.8309E-02 -4.2659E-02 2.9140E-03 5.1741E-03 -2.2618E-03 3.3499E-04 -1.0130E-06 -3.9479E-06 2.5480E-07 S12 8.1144E-02 -2.4122E-02 -1.1286E-02 1.6333E-02 -7.6149E-03 1.8269E-03 -2.4081E-04 1.6598E-05 -4.6890E-07 S13 -1.2659E-02 -6.8499E-02 5.4628E-02 -1.8762E-02 3.6694E-03 -4.3732E-04 3.1557E-05 -1.2717E-06 2.2029E-08 S14 -9.8531E-02 1.9139E-02 -6.4722E-04 -6.3641E-04 1.3840E-04 -1.0685E-05 5.8707E-09 4.0400E-08 -1.5090E-09

[0214] Table 22

[0215] Figure 22A Shows the axial chromatic aberration curve of the imaging lens group of Example 11, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 22B Shows the astigmatism curve of the imaging lens group of Example 11, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 22C Shows the distortion curve of the imaging lens group of Example 11, which represents the distortion magnitude values corresponding to different image heights. Figure 22D Shows the lateral chromatic aberration curve of the imaging lens group of Example 11, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 22A to 22DIt can be seen that the imaging lens group given in Embodiment 11 can achieve good imaging quality.

[0216] Example 12

[0217] The following refers to Figures 23 to 24D and describes an imaging lens group according to Embodiment 12 of the present application. Figure 23 FIG. shows a schematic structural diagram of an imaging lens group according to Embodiment 12 of the present application.

[0218] As Figure 23 shown, the imaging lens group 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.

[0219] 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 positive 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 negative optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a positive optical power, its object side surface S7 is a convex surface, and its image side surface S8 is a convex surface. The fifth lens E5 has a positive optical power, its object side surface S9 is a convex surface, and its image side surface S10 is a convex surface. The sixth lens E6 has a negative optical power, its object side surface S11 is a concave surface, and its image side surface S12 is a convex 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. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0220] In this example, the total effective focal length f of the imaging lens group is 4.31 mm, the total length TTL of the imaging lens group is 5.26 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the imaging lens group is ImgH = 4.12 mm, and the maximum field of view FOV of the imaging lens group is 85.9°.

[0221] Table 23 shows the basic parameter table of the imaging lens group of Embodiment 12, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Table 24 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 12, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0222]

[0223] Table 23

[0224]

[0225]

[0226] Table 24

[0227] Figure 24A shows the axial chromatic aberration curve of the imaging lens group of Example 12, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 24B shows the astigmatism curve of the imaging lens group of Example 12, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 24C shows the distortion curve of the imaging lens group of Example 12, which represents the distortion magnitude values corresponding to different image heights. Figure 24D shows the lateral chromatic aberration curve of the imaging lens group of Example 12, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 24A to 24D it can be seen that the imaging lens group given in Example 12 can achieve good imaging quality.

[0228] In summary, Examples 1 to 12 respectively satisfy the relationships shown in Table 25.

[0229]

[0230] Table 25

[0231] 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 above-described imaging lens group.

[0232] 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 (but not limited to) technical features having similar functions disclosed in the present application.

Claims

1. An imaging lens group, characterized in that, sequentially including from the object side to the image side along the optical axis: a first lens with positive optical power, whose object side is convex and image side is concave; a second lens with optical power, whose object side is convex; a third lens with optical power, whose image side is concave; a fourth lens with optical power; a fifth lens with optical power; a sixth lens with optical power, whose image side is convex; a seventh lens with negative optical power, whose object side is concave and image side is concave; wherein, the fourth lens and the sixth lens have positive optical power, the fifth lens has negative optical power, and at most one of the second lens and the third lens has positive optical power; or, the second lens has negative optical power, the fifth lens and the sixth lens have positive optical power, and the signs of the optical powers of the third lens and the fourth lens are opposite; or, the second lens, the fourth lens and the fifth lens have positive optical power, and the third lens has negative optical power; the number of lenses with optical power in the imaging lens group is seven; the F-number Fno of the imaging lens group, the distance TTL on the optical axis from the object side of the first lens to the imaging plane of the imaging lens group, and half of the diagonal length ImgH of the effective pixel area on the imaging plane of the imaging lens group satisfy: Fno×TTL / ImgH≤2.07; the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.4<CT1 / (CT2+CT3)≤1.69; the interval distance T23 between the second lens and the third lens on the optical axis and the interval distance T34 between the third lens and the fourth lens on the optical axis satisfy: 0.5<T23 / T34≤1.

42.

2. The imaging lens group according to claim 1, characterized in that, the effective focal length f1 of the first lens and the total effective focal length f of the imaging lens group satisfy: 1.2≤f1 / f≤1.

70.

3. The imaging lens group according to claim 1, characterized in that, the effective focal length f1 of the first lens and the effective focal length f7 of the seventh lens satisfy: -2.63≤f1 / f7≤-1.

96.

4. The imaging lens group according to claim 1, characterized in that, the radius of curvature R14 of the image side of the seventh lens and the total effective focal length f of the imaging lens group satisfy: 0.5<R14 / f≤0.

57.

5. The imaging lens group according to claim 1, characterized in that, the radius of curvature R12 of the image side of the sixth lens and the radius of curvature R13 of the object side of the seventh lens satisfy: 0.61≤R12 / R13≤0.

88.

6. The imaging lens group according to claim 1, characterized in that, The combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the total effective focal length f of the imaging lens group satisfy: 1 < f1234 / f < 1.

7.

7. The imaging lens group according to claim 1, wherein, 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 satisfies: -4.40 ≤ SAG71 / CT7 ≤ -2.28 with respect to the central thickness CT7 of the seventh lens on the optical axis.

8. The imaging lens group according to claim 1, wherein, the distance SAG32 on the optical axis between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens and the distance SAG41 on the optical axis between the intersection of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens satisfy: -12.29 ≤ SAG32 / SAG41 ≤ -0.

33.

9. The imaging lens group according to claim 1, wherein, the effective semi-aperture DT11 of the object side surface of the first lens and the effective semi-aperture DT72 of the image side surface of the seventh lens satisfy: 0.40 ≤ DT11 / DT72 < 0.

5.

10. The imaging lens group according to claim 1, wherein, the effective semi-aperture DT12 of the image side surface of the first lens and the effective semi-aperture DT51 of the object side surface of the fifth lens satisfy: 0.69 ≤ DT12 / DT51 ≤ 0.

81.

11. The imaging lens group according to claim 1, wherein, 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 SAG61 on the optical axis between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: 0.3 < SAG52 / SAG61 ≤ 1.

04.

12. The imaging lens group according to claim 1, wherein, the effective semi-aperture DT42 of the image side surface of the fourth lens and the effective semi-aperture DT51 of the object side surface of the fifth lens satisfy: 0.76 ≤ DT42 / DT51 ≤ 0.

87.

13. The imaging lens group according to claim 1, wherein, the distance T45 on the optical axis between the fourth lens and the fifth lens and the distance T56 on the optical axis between the fifth lens and the sixth lens satisfy: 2.09 ≤ T45 / T56 ≤ 4.

46.

14. The imaging lens group according to any one of claims 1-13, wherein, the second lens is made of a glass material, and the refractive index of the second lens is not less than the refractive index of any other lens in the imaging lens group.

15. The imaging lens group according to any one of claims 1-13, wherein, The total effective focal length f of the imaging lens group and the entrance pupil diameter EPD of the imaging lens group satisfy: 1.48 ≤ f / EPD ≤ 1.

49.

16. The imaging lens group according to any one of claims 1-13, wherein, the maximum field of view FOV of the imaging lens group satisfies: 12.82 ≤ tan(FOV) ≤ 66.

92.

17. The imaging lens group according to any one of claims 1-13, wherein, the F-number Fno of the imaging lens group, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens group, and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens group satisfy: 1.90 ≤ Fno × TTL / ImgH ≤ 2.07.

Images