Optical lens group

Abstract

The present application provides an optical lens group, which may sequentially include, from the object side to the image side along the optical axis: a first lens with a negative focal power; a second lens with a negative focal power; a third lens with a positive focal power, whose image side is convex; a fourth lens with a negative focal power; a fifth lens with a focal power; a sixth lens with a focal power, whose object side is concave; and a seventh lens with a focal power. The optical lens group satisfies: tan(FOV / 4) / Fno > 0.5; and 2 < f3 / f < 3, where FOV is the maximum field of view angle of the optical lens group, Fno is the numerical aperture of the optical lens group, f3 is the effective focal length of the third lens, and f is the total effective focal length of the optical lens group.

Description

Technical Field

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

[0002] In recent years, with the rapid development of electronic products, higher requirements have been put forward for the optical lens groups mounted on electronic products. For example, obstacle avoidance electronic products need to survey the environment within a large field of view, so the optical lens groups mounted on them need to have the performance of a large field of view angle to meet the application requirements of obstacle avoidance electronic products.

[0003] In addition, considering the night working environment of obstacle avoidance electronic products, the optical lens groups mounted on them also need to have a large aperture to meet the light passing requirements for their work. Therefore, the market demand for fish-eye lenses with the characteristics of a large aperture is increasing.

[0004] At the same time, along with the trend of electronic products towards being thinner and lighter, the optical lens groups mounted on them not only need good imaging quality but also need to have a thin and light size. Summary of the Invention

[0005] On the one hand, the present application provides such an optical lens group, which may sequentially include, from the object side to the image side along the optical axis: a first lens with a negative optical power; a second lens with a negative optical power; a third lens with a positive optical power, whose image side is convex; a fourth lens with a negative optical power; a fifth lens with an optical power; a sixth lens with an optical power, whose object side is concave; and a seventh lens with an optical power. The optical lens group can satisfy tan(FOV / 4) / Fno>0.5; and 2<f3 / f<3, where FOV is the maximum field of view angle of the optical lens group, Fno is the numerical aperture of the optical lens group, f3 is the effective focal length of the third lens, and f is the total effective focal length of the optical lens group.

[0006] In some embodiments, the optical lens group can satisfy: 0<f1 / f2<1, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.

[0007] In some embodiments, the optical lens group can satisfy: 3.5<TTL / ImgH<4.5, where TTL is the distance along the optical axis from the object side of the first lens to the imaging surface of the optical lens group, and ImgH is half of the diagonal length of the effective pixel region of the imaging surface.

[0008] In some embodiments, the object side of the fourth lens can be concave, and the optical lens group can satisfy 0<R6 / R7<1, where R6 is the radius of curvature of the image side of the third lens and R7 is the radius of curvature of the object side of the fourth lens.

[0009] In some embodiments, the optical lens group may satisfy: 0.4 < T34 / (CT4 - T34) < 1.1, where T34 is the distance between the third lens and the fourth lens along the optical axis, and CT4 is the central thickness of the fourth lens along the optical axis.

[0010] In some embodiments, the optical lens group may further include a diaphragm disposed between the object and the imaging surface of the optical lens group. At least one lens made of plastic and at least one lens made of glass are disposed between the object and the diaphragm, and at least three lenses made of plastic are disposed between the diaphragm and the imaging surface.

[0011] In some embodiments, the optical lens group may satisfy: 0 < (N1 - N2) / (N3 - N2) < 2, where N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens.

[0012] In some embodiments, the optical lens group may satisfy: 0 < T56 / T67 < 1, where T56 is the distance between the fifth lens and the sixth lens along the optical axis, and T67 is the distance between the sixth lens and the seventh lens along the optical axis.

[0013] In some embodiments, the optical lens group may satisfy: 0 < SAG71 / CT7 < 0.5, where SAG71 is the distance 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 in the optical axis direction, and CT7 is the central thickness of the seventh lens along the optical axis.

[0014] In some embodiments, the optical lens group may satisfy: 0.5 < DT32 / DT41 < 1, where DT32 is the effective radius of the image side surface of the third lens, and DT41 is the effective radius of the object side surface of the fourth lens.

[0015] In some embodiments, the optical lens group may satisfy: 1 < f56 / f7 < 2.5, where f56 is the combined focal length of the fifth lens and the sixth lens, and f7 is the effective focal length of the seventh lens.

[0016] In some embodiments, the optical lens group may satisfy: 0 < T45 / SAG51 < 0.5, where T45 is the distance between the fourth lens and the fifth lens along the optical axis, and SAG51 is the distance from the intersection of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens in the optical axis direction.

[0017] On the other hand, the present application also provides an optical lens group, which may sequentially include, from the object side to the image side along the optical axis: a first lens with a negative optical power; a second lens with a negative optical power; a third lens with a positive optical power, whose image side is convex; a fourth lens with an optical power, whose object side is concave; a fifth lens with an optical power; a sixth lens with an optical power, whose object side is concave; and a seventh lens with an optical power. The optical lens group can satisfy: tan(FOV / 4) / Fno > 0.5; and 0 < R6 / R7 < 1, where FOV is the maximum field of view angle of the optical lens group, Fno is the numerical aperture of the optical lens group, R6 is the radius of curvature of the image side of the third lens, and R7 is the radius of curvature of the object side of the fourth lens.

[0018] In some embodiments, the optical lens group can satisfy: 2 < f3 / f < 3, where f3 is the effective focal length of the third lens and f is the total effective focal length of the optical lens group.

[0019] In some embodiments, the optical lens group may further include a diaphragm disposed between the object to be photographed and the imaging surface of the optical lens group. At least one lens made of plastic and at least one lens made of glass are disposed between the object to be photographed and the diaphragm, and at least three lenses made of plastic are disposed between the diaphragm and the imaging surface.

[0020] In some embodiments, the optical lens group can satisfy: 0 < SAG71 / CT7 < 0.5, where SAG71 is the distance in the optical axis direction from the intersection of the object side of the seventh lens and the optical axis to the vertex of the effective radius of the object side of the seventh lens, and CT7 is the central thickness of the seventh lens along the optical axis.

[0021] In some embodiments, the optical lens group can satisfy: 0.5 < DT32 / DT41 < 1, where DT32 is the effective radius of the image side of the third lens and DT41 is the effective radius of the object side of the fourth lens.

[0022] In some embodiments, the optical lens group can satisfy: 1 < f56 / f7 < 2.5, where f56 is the combined focal length of the fifth lens and the sixth lens, and f7 is the effective focal length of the seventh lens.

[0023] In some embodiments, the optical lens group can satisfy: 0 < T45 / SAG51 < 0.5, where T45 is the distance between the fourth lens and the fifth lens along the optical axis, and SAG51 is the distance in the optical axis direction from the intersection of the object side of the fifth lens and the optical axis to the vertex of the effective radius of the object side of the fifth lens.

[0024] In some embodiments, the optical lens group can satisfy: 0 < f1 / f2 < 1, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.

[0025] In some embodiments, the optical lens group may satisfy: 3.5 < TTL / ImgH < 4.5, where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group, and ImgH is half of the diagonal length of the effective pixel region of the imaging surface.

[0026] In some embodiments, the optical lens group may satisfy: 0.4 < T34 / (CT4 - T34) < 1.1, where T34 is the distance along the optical axis between the third lens and the fourth lens, and CT4 is the central thickness of the fourth lens along the optical axis.

[0027] In some embodiments, the optical lens group may satisfy: 0 < (N1 - N2) / (N3 - N2) < 2, where N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens.

[0028] In some embodiments, the optical lens group may satisfy: 0 < T56 / T67 < 1, where T56 is the distance along the optical axis between the fifth lens and the sixth lens, and T67 is the distance along the optical axis between the sixth lens and the seventh lens. Description of the Drawings

[0029] In conjunction with the accompanying drawings, through the following detailed description of non - restrictive embodiments, other features, objects, and advantages of the present application will become more apparent. In the drawings:

[0030] Figure 1 A schematic structural diagram of the optical lens group according to Embodiment 1 of the present application is shown;

[0031] Figures 2A to 2B The axial chromatic aberration curve and the astigmatism curve of the optical lens group of Embodiment 1 are respectively shown;

[0032] Figure 3 A schematic structural diagram of the optical lens group according to Embodiment 2 of the present application is shown;

[0033] Figures 4A to 4B The axial chromatic aberration curve and the astigmatism curve of the optical lens group of Embodiment 2 are respectively shown;

[0034] Figure 5 A schematic structural diagram of the optical lens group according to Embodiment 3 of the present application is shown;

[0035] Figures 6A to 6B The axial chromatic aberration curve and the astigmatism curve of the optical lens group of Embodiment 3 are respectively shown;

[0036] Figure 7 A schematic structural diagram of the optical lens group according to Embodiment 4 of the present application is shown;

[0037] Figures 8A to 8B The axial chromatic aberration curve and the astigmatism curve of the optical lens group of Embodiment 4 are respectively shown;

[0038] Figure 9 The structural schematic diagram of the optical lens group according to Embodiment 5 of the present application is shown;

[0039] Figures 10A to 10B The axial chromatic aberration curve and the astigmatism curve of the optical lens group of Embodiment 5 are respectively shown;

[0040] Figure 11 The structural schematic diagram of the optical lens group according to Embodiment 6 of the present application is shown; and

[0041] Figures 12A to 12B The axial chromatic aberration curve and the astigmatism curve of the optical lens group of Embodiment 6 are respectively shown. Detailed Embodiments

[0042] 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.

[0043] 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.

[0044] In the drawings, for the sake of convenience of illustration, 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 examples and are not drawn strictly to scale.

[0045] In this article, 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 to be photographed is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens.

[0046] It should also be understood that the terms "comprising", "comprises", "having", "including" and / or "includes", 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. Further, 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. Further, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0047] 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.

[0048] 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 conjunction with the embodiments.

[0049] The features, principles and other aspects of the present application will be described in detail below.

[0050] The optical lens group according to an exemplary embodiment of the present application may include seven lenses having 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. The first lens to the seventh lens are arranged in sequence from the object side to the image side along the optical axis of the optical lens group, and there may be a spacing distance between any two adjacent lenses.

[0051] In an exemplary embodiment, the first lens may have a negative optical power, its object side may be convex, and its image side may be concave.

[0052] In an exemplary embodiment, the second lens may have a negative optical power, its object side may be convex, and its image side may be concave.

[0053] In an exemplary embodiment, the third lens may have a positive optical power, its object side may be concave, and its image side may be convex.

[0054] In an exemplary embodiment, the fourth lens may have a negative optical power, its object side may be concave, and its image side may be convex.

[0055] In an exemplary embodiment, the fifth lens may have a positive optical power, its object side may be convex, and its image side may be convex.

[0056] In an exemplary embodiment, the sixth lens may have a negative optical power, and both its object side and image side may be concave.

[0057] In an exemplary embodiment, the seventh lens may have a positive optical power, and both its object side and image side may be convex.

[0058] In an exemplary embodiment, the optical lens group may further include a diaphragm disposed between the object to be photographed and the imaging surface of the optical lens group. Among them, at least one lens made of plastic and at least one lens made of glass are disposed between the object to be photographed and the diaphragm, and at least three lenses made of plastic are disposed between the diaphragm and the imaging surface. Reasonably selecting the material of the lens is beneficial to the application of the optical lens group in an environment with a large temperature difference, reducing the temperature drift of the optical lens group, and meeting the requirement of excellent optical performance. In some embodiments, the first lens and the third lens may be lenses made of glass. In some embodiments, the third lens is an aspherical lens made of glass.

[0059] In an exemplary embodiment, the optical lens group according to the present application may satisfy: tan(FOV / 4) / Fno > 0.5, where FOV is the maximum field of view angle of the optical lens group, and Fno is the numerical aperture of the optical lens group. Satisfying tan(FOV / 4) / Fno > 0.5 is beneficial to making the optical lens group meet the requirements of a large field of view angle and a large aperture. For example, FOV and Fno may satisfy tan(FOV / 4) / Fno > 0.8.

[0060] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 2 < f3 / f < 3, where f3 is the effective focal length of the third lens, and f is the total effective focal length of the optical lens group. Satisfying 2 < f3 / f < 3 is beneficial to realizing the reasonable distribution of the optical power of the third lens in the optical lens group, and further beneficial to reducing the aberration of the optical lens group.

[0061] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 0 < f1 / f2 < 1, where f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. Satisfying 0 < f1 / f2 < 1 is beneficial to realizing the reasonable distribution of the optical power of the first lens and the second lens in the optical lens group, and further reducing the aberration of the optical lens group. For example, f1 and f2 may satisfy 0.5 < f1 / f2 < 1.

[0062] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 3.5 < TTL / ImgH < 4.5, where TTL is the distance along the optical axis from the object side surface of the first lens to the imaging surface of the optical lens group, and ImgH is half of the diagonal length of the effective pixel region of the imaging surface. Satisfying 3.5 < TTL / ImgH < 4.5 is beneficial to reducing the overall size of the optical lens group, and further enables its structure to adapt to the current miniaturization trend. For example, TTL and ImgH may satisfy 4.0 < TTL / ImgH < 4.5.

[0063] In an exemplary embodiment, the object side surface of the fourth lens may be concave, and the optical lens group according to the present application may satisfy 0 < R6 / R7 < 1, where R6 is the radius of curvature of the image side surface of the third lens, and R7 is the radius of curvature of the object side surface of the fourth lens. Reasonably restricting the ratio of the radius of curvature of the image side surface of the third lens to the radius of curvature of the object side surface of the fourth lens is beneficial to improving the imaging quality of the lens group.

[0064] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 0.4 < T34 / (CT4 - T34) < 1.1, where T34 is the distance along the optical axis between the third lens and the fourth lens, and CT4 is the central thickness of the fourth lens along the optical axis. Reasonably controlling the on-axis spacing between the third lens and the fourth lens and the central thickness of the fourth lens is beneficial to controlling the amount of distortion contribution within a reasonable range.

[0065] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 0 < (N1 - N2) / (N3 - N2) < 2, where N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens. Reasonably selecting the materials of the first lens, the second lens, and the third lens is beneficial to correcting the lateral chromatic aberration of the optical lens group, and further obtaining excellent imaging performance. Optionally, N1, N2, and N3 may satisfy 0.5 < (N1 - N2) / (N3 - N2) < 1.

[0066] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 0 < T56 / T67 < 1, where T56 is the distance along the optical axis between the fifth lens and the sixth lens, and T67 is the distance along the optical axis between the sixth lens and the seventh lens. Reasonably restricting the air gaps between the fifth lens and the sixth lens and between the sixth lens and the seventh lens is beneficial to balancing the field curvature generated by the lens located at the front position of the optical lens group and the field curvature generated by the lens located at the rear position of the optical lens group, so that the optical lens group has reasonable field curvature.

[0067] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 0 < SAG71 / CT7 < 0.5, where SAG71 is the distance in the optical axis direction from the intersection point 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 along the optical axis. Satisfying 0 < SAG71 / CT7 < 0.5 is beneficial to controlling the shape of the seventh lens to obtain good processability. For example, SAG71 and CT7 may satisfy 0.2 < SAG71 / CT7 < 0.4.

[0068] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 0.5 < DT32 / DT41 < 1, where DT32 is the effective radius of the image side surface of the third lens, and DT41 is the effective radius of the object side surface of the fourth lens. Reasonably controlling the maximum effective radius of the image side surface of the third lens and the maximum effective radius of the object side surface of the fourth lens is beneficial to reducing the overall size of the optical lens group to meet the requirements of miniaturization, and is also beneficial to improving the resolution of the optical lens group. For example, DT32 and DT41 may satisfy 0.7 < DT32 / DT41 < 1.

[0069] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 1 < f56 / f7 < 2.5, where f56 is the combined focal length of the fifth lens and the sixth lens, and f7 is the effective focal length of the seventh lens. Satisfying 1 < f56 / f7 < 2.5 is beneficial to the reasonable distribution of the optical power of the fifth lens, the optical power of the sixth lens, and the optical power of the seventh lens in the optical lens group, and thus is beneficial to reducing the aberration of the optical lens group.

[0070] In an exemplary embodiment, the optical lens group according to the present application may satisfy: 0 < T45 / SAG51 < 0.5, where T45 is the axial spacing between the fourth lens and the fifth lens along the optical axis, and SAG51 is the distance in the optical axis direction from the intersection point of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens. For example, T45 and SAG51 may satisfy 0.2 < T45 / SAG51 < 0.4. Reasonably controlling the ratio of the on-axis spacing between the fourth lens and the fifth lens to the on-axis spacing between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens is beneficial to controlling the shape of the fifth lens so that the fifth lens has good processability.

[0071] In an exemplary embodiment, the optical lens group of 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.

[0072] The optical lens group according to the above-described embodiments of the present application may employ a plurality of lenses, for example, seven as described above. By reasonably allocating the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the volume of the optical lens group can be effectively reduced and the processability of the optical lens group can be improved, making the optical lens group more conducive to production and applicable to portable electronic products. The optical lens group configured as described above may have characteristics such as a large field of view angle, a large aperture, a small size, and a high pixel count.

[0073] In the embodiments of the present application, each lens mostly uses an aspherical lens. In an example, at least one of the object side surface of the second lens to the image side surface of the seventh lens is an aspherical lens. The characteristic of an aspherical lens is that its curvature continuously changes from the center of the lens to the edge of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the edge of the lens, an aspherical lens has better curvature radius characteristics and has the advantage of improving distortion aberration, that is, improving 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 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 second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are aspherical mirror surfaces.

[0074] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the optical 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 embodiments, the optical lens group is not limited to including seven lenses. If necessary, the optical lens group may also include other numbers of lenses.

[0075] The following further describes specific embodiments of the optical lens group applicable to the above-described embodiments with reference to the accompanying drawings.

[0076] Embodiment 1

[0077] The following refers to Figures 1 to 2B Describe the optical lens group according to Embodiment 1 of the present application. Figure 1 A schematic structural diagram of the optical lens group according to Embodiment 1 of the present application is shown.

[0078] As Figure 1 shown, the optical lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0079] The first lens E1 has a negative 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 positive optical power, its object side S5 is concave, and its image side S6 is convex. The fourth lens E4 has a negative optical power, its object side S7 is concave, 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 convex. The sixth lens E6 has a negative optical power, its object side S11 is concave, and its image side S12 is concave. The seventh lens E7 has a positive optical power, its object side S13 is convex, and its image side S14 is convex. 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.

[0080] Table 1 shows the basic parameters of the optical lens group of Example 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0081]

[0082] Table 1

[0083] In this example, the total effective focal length f of the optical lens group is 1.88 mm, the total length TTL of the optical lens group (i.e., the distance along the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the optical lens group) is 12.55 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical lens group ImgH is 3.10 mm, the numerical aperture Fno of the optical lens group is 1.40, and the maximum field of view FOV of the optical lens group is 209.8°.

[0084] In Example 1, the object side and the image side of any one of the second lens E2 to the seventh lens E7 are aspherical surfaces, and the surface profile x of the aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0085]

[0086] where x is the sagitta, 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. Tables 2 and 3 give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical surfaces S3 - S14 in Example 1.

[0087] Face number A4 A6 A8 A10 A12 A14 A16 S3 1.2260E-01 -1.0646E-01 7.0322E-02 -3.5231E-02 1.2996E-02 -3.5103E-03 6.9492E-04 S4 1.2109E-01 4.5369E-02 -3.6309E-01 6.9116E-01 -7.6990E-01 5.6410E-01 -2.8304E-01 S5 -2.6206E-03 -3.8377E-03 2.4408E-03 -1.6321E-03 4.2780E-04 -9.5274E-06 -5.7283E-06 S6 1.6823E-02 -8.6752E-03 8.5419E-03 -7.0745E-03 3.6961E-03 -9.9330E-04 1.0037E-04 S7 3.6872E-02 -1.8154E-02 7.7731E-03 -2.9965E-03 8.1778E-04 -1.6485E-04 2.6580E-05 S8 1.7815E-01 -2.8660E-01 2.3054E-01 -1.1832E-01 4.2044E-02 -1.0704E-02 1.9640E-03 S9 2.2612E-02 2.4477E-02 -2.4175E-01 3.7937E-01 -3.4421E-01 2.2244E-01 -1.0887E-01 S10 -2.8077E-01 4.9058E-01 -7.5345E-01 8.4362E-01 -6.9349E-01 4.2866E-01 -2.0058E-01 S11 -1.6349E-01 1.9562E-01 -2.2372E-01 2.2039E-01 -1.7636E-01 1.1053E-01 -5.3018E-02 S12 -7.6459E-01 1.9789E+00 -3.6629E+00 4.8534E+00 -4.6117E+00 3.1705E+00 -1.5927E+00 S13 -7.3932E-01 1.9588E+00 -3.6383E+00 4.8086E+00 -4.5501E+00 3.1106E+00 -1.5510E+00 S14 -7.7924E-02 2.1695E-01 -3.3098E-01 3.4476E-01 -2.5540E-01 1.3614E-01 -5.2367E-02

[0088] Table 2

[0089] Face number A18 A20 A22 A24 A26 A28 A30 S3 -1.0049E-04 1.0482E-05 -7.6703E-07 3.7333E-08 -1.0845E-09 1.4217E-11 0.0000E+00 S4 9.8231E-02 -2.3271E-02 3.6054E-03 -3.3064E-04 1.3677E-05 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 3.5986E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 -3.1882E-06 1.9815E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -2.4901E-04 1.7482E-05 3.6236E-07 -2.0120E-07 1.3315E-08 0.0000E+00 0.0000E+00 S9 4.0376E-02 -1.1039E-02 2.1317E-03 -2.7246E-04 2.0427E-05 -6.4955E-07 -3.4831E-09 S10 7.0405E-02 -1.8126E-02 3.2901E-03 -3.9167E-04 2.6016E-05 -4.9225E-07 -2.6331E-08 S11 1.9159E-02 -5.1382E-03 1.0017E-03 -1.3729E-04 1.2483E-05 -6.7280E-07 1.6185E-08 S12 5.8800E-01 -1.5929E-01 3.1285E-02 -4.3344E-03 4.0166E-04 -2.2341E-05 5.6405E-07 S13 5.6724E-01 -1.5191E-01 2.9438E-02 -4.0170E-03 3.6600E-04 -1.9984E-05 4.9446E-07 S14 1.4493E-02 -2.8527E-03 3.8915E-04 -3.4945E-05 1.8571E-06 -4.4233E-08 0.0000E+00

[0090] Table 3

[0091] Figure 2A The axial chromatic aberration curve of the optical lens group of Example 1 is shown, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens group. Figure 2B The astigmatism curve of the optical lens group of Example 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. According to Figures 2A to 2B it can be known that the optical lens group given in Example 1 can achieve good imaging quality.

[0092] Example 2

[0093] The following refers to Figures 3 to 4B to describe the optical lens group 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 Example 1 will be omitted. Figure 3 The structural schematic diagram of the optical lens group according to Embodiment 2 of the present application is shown.

[0094] As Figure 3 shown, the optical lens group may sequentially include, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0095] The first lens E1 has a negative 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 concave 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 concave 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 concave surface. The seventh lens E7 has a positive optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a convex surface. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object to be photographed sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface S17.

[0096] In this example, the total effective focal length f of the optical lens group is 1.80 mm, the total length TTL of the optical lens group is 12.56 mm, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the optical lens group is 3.00 mm, the numerical aperture Fno of the optical lens group is 1.43, and the maximum field of view FOV of the optical lens group is 198.0°.

[0097] Table 4 shows the basic parameters of the optical lens group of Example 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 5 and 6 give the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, and A26 that can be used for each aspherical mirror surface S3 - S14 in Example 2, where each aspherical surface type can be defined by formula (1) given in the above Example 1.

[0098]

[0099] Table 4

[0100]

[0101]

[0102] Table 5

[0103] Face number A16 A18 A20 A22 A24 A26 S3 -3.1364E-04 8.2759E-05 -1.3438E-05 1.2333E-06 -4.9136E-08 0.0000E+00 S4 2.7927E-01 -1.3279E-01 3.4991E-02 -3.9261E-03 0.0000E+00 0.0000E+00 S5 2.1567E-05 -4.1189E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -5.9223E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.6129E-05 2.6328E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.2520E-03 2.4727E-04 -3.1879E-05 2.9822E-06 -2.6825E-07 1.7104E-08 S9 -2.3588E-04 1.9948E-05 -5.2602E-07 -2.0442E-08 0.0000E+00 0.0000E+00 S10 7.7525E-04 -1.1806E-04 1.0322E-05 -5.1378E-07 2.7154E-08 -1.6929E-09 S11 1.2533E-06 1.3830E-08 2.8321E-09 -1.2002E-11 0.0000E+00 0.0000E+00 S12 -1.2674E-07 -9.8292E-09 8.3407E-10 0.0000E+00 0.0000E+00 0.0000E+00 S13 -5.1451E-07 -1.1020E-09 -4.7517E-10 0.0000E+00 0.0000E+00 0.0000E+00 S14 6.7108E-08 9.3376E-10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0104] Table 6

[0105] Figure 4A Shows the axial chromatic aberration curve of the optical lens group of Example 2, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens group. Figure 4B Shows the astigmatism curve of the optical lens group of Example 2, which represents the meridional image plane curvature and the sagittal image plane curvature. According to Figures 4A to 4B It can be seen that the optical lens group given in Example 2 can achieve good imaging quality.

[0106] Example 3

[0107] The following refers to Figures 5 to 6B Describe the optical lens group according to Embodiment 3 of the present application. Figure 5 Shows a schematic structural diagram of the optical lens group according to Embodiment 3 of the present application.

[0108] As Figure 5 shown, the optical lens group may sequentially include, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a diaphragm STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0109] The first lens E1 has a negative 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 concave, and its image side S6 is convex. The fourth lens E4 has a negative focal power, its object side S7 is concave, and its image side S8 is convex. The fifth lens E5 has a positive focal power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a negative focal power, its object side S11 is concave, and its image side S12 is concave. The seventh lens E7 has a positive focal power, its object side S13 is convex, and its image side S14 is convex. 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.

[0110] In this example, the total effective focal length f of the optical lens group is 1.85 mm, the total length TTL of the optical lens group is 12.56 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical lens group is ImgH = 3.10 mm, the numerical aperture Fno of the optical lens group is 1.53, and the maximum field of view angle FOV of the optical lens group is 209.8°.

[0111] Table 7 shows the basic parameters of the optical lens group of Example 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 8 and 9 give the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, and A26 that can be used for each aspherical mirror surface S3 - S14 in Example 3, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0112]

[0113]

[0114] Table 7

[0115] Face number A4 A6 A8 A10 A12 A14 S3 1.7513E-02 -6.3635E-03 3.0355E-03 -1.4172E-03 3.4733E-04 1.0565E-04 S4 3.7286E-02 -1.4117E-02 5.3320E-02 -1.4395E-01 2.5101E-01 -2.8057E-01 S5 -2.1509E-02 -2.1449E-03 4.1970E-03 -8.4239E-03 6.7162E-03 -2.3915E-03 S6 3.4636E-02 -1.0747E-02 1.9609E-03 1.7144E-03 -1.2379E-03 3.6606E-04 S7 1.2283E-01 -7.5721E-02 4.2741E-02 -1.8615E-02 5.3767E-03 -8.7317E-04 S8 -3.9768E-02 1.5286E-02 -1.7465E-02 1.8147E-02 -1.3639E-02 7.0055E-03 S9 -6.2874E-02 3.3890E-02 -2.1601E-02 1.1147E-02 -4.1439E-03 1.0489E-03 S10 -5.0106E-03 6.3786E-03 3.0532E-03 -7.8024E-03 5.4264E-03 -2.0938E-03 S11 6.8258E-02 -2.5642E-02 7.2578E-03 -2.1353E-03 5.0119E-04 -6.1856E-05 S12 5.8769E-02 -2.1102E-02 5.6870E-03 -1.1118E-03 1.3749E-04 -8.5824E-06 S13 -2.4917E-02 9.3802E-03 -3.1298E-03 8.0695E-04 -1.3413E-04 1.2071E-05 S14 3.9982E-03 -1.6323E-03 7.8646E-04 -1.9330E-04 3.1063E-05 -2.5817E-06

[0116] Table 8

[0117] Face number A16 A18 A20 A22 A24 A26 S3 -1.2213E-04 4.5668E-05 -8.9997E-06 9.3726E-07 -4.0884E-08 0.0000E+00 S4 2.0274E-01 -9.1777E-02 2.3637E-02 -2.6390E-03 0.0000E+00 0.0000E+00 S5 3.2205E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -3.3669E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 5.8536E-05 4.1413E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -2.3983E-03 5.3160E-04 -7.4816E-05 7.3091E-06 -6.6358E-07 4.4381E-08 S9 -1.7102E-04 1.6633E-05 -8.3971E-07 1.5770E-08 0.0000E+00 0.0000E+00 S10 4.9901E-04 -7.2561E-05 5.8320E-06 -1.9432E-07 0.0000E+00 0.0000E+00 S11 1.6221E-06 3.3519E-07 -3.1109E-08 2.4400E-09 0.0000E+00 0.0000E+00 S12 1.9787E-07 -1.0681E-08 1.6179E-09 0.0000E+00 0.0000E+00 0.0000E+00 S13 -4.2338E-07 -1.7106E-09 -3.5467E-10 0.0000E+00 0.0000E+00 0.0000E+00 S14 5.9018E-08 7.1138E-10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0118] Table 9

[0119] Figure 6A Shows the axial chromatic aberration curve of the optical lens group of Example 3, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 6BShows the astigmatism curve of the optical lens group of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. According to Figures 6A to 6B it can be known that the optical lens group given in Embodiment 3 can achieve good imaging quality.

[0120] Embodiment 4

[0121] The following will refer to Figures 7 to 8B describe the optical lens group according to Embodiment 4 of the present application. Figure 7 Shows a schematic structural diagram of the optical lens group according to Embodiment 4 of the present application.

[0122] As Figure 7 shown, the optical lens group may sequentially include, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0123] The first lens E1 has a negative 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 concave 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 concave 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 concave surface. The seventh lens E7 has a positive optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a convex surface. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object to be photographed sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0124] In this example, the total effective focal length f of the optical lens group is 1.87 mm, the total length TTL of the optical lens group is 12.45 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical lens group is ImgH = 3.10 mm, the numerical aperture Fno of the optical lens group is 1.43, and the maximum field of view FOV of the optical lens group is 209.8°.

[0125] Table 10 shows the basic parameters of the optical lens group of Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 11 and 12 give the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, and A26 that can be used for the aspherical mirror surfaces S3 - S14 in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0126]

[0127] Table 10

[0128]

[0129]

[0130] Table 11

[0131] Face number A16 A18 A20 A22 A24 A26 S3 -3.2394E-03 7.3435E-04 -1.0677E-04 8.9991E-06 -3.3440E-07 0.0000E+00 S4 3.8104E-02 -9.4483E-03 -1.0886E-03 1.0722E-03 -1.6296E-04 0.0000E+00 S5 -8.8862E-06 -8.2885E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 2.6758E-05 1.0769E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 2.8966E-05 1.6432E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -1.1634E-03 2.3607E-04 -3.0777E-05 2.8377E-06 -2.4679E-07 1.5751E-08 S9 -8.2138E-05 1.9640E-06 3.2858E-07 1.8042E-08 -4.5647E-09 0.0000E+00 S10 5.1615E-04 -7.9246E-05 6.8152E-06 -3.0724E-07 1.3598E-08 -8.7539E-10 S11 3.8138E-06 -1.8401E-07 4.2730E-08 -3.4449E-09 1.6170E-10 0.0000E+00 S12 9.5827E-07 -5.7053E-09 2.3235E-09 0.0000E+00 0.0000E+00 0.0000E+00 S13 -5.2941E-07 -2.8671E-09 -4.0123E-10 0.0000E+00 0.0000E+00 0.0000E+00 S14 4.1358E-08 7.1222E-10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0132] Table 12

[0133] Figure 8A The axial chromatic aberration curve of the optical lens group of Example 4 is shown, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens group. Figure 8B The astigmatism curve of the optical lens group of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. According to Figures 8A to 8B it can be known that the optical lens group given in Example 4 can achieve good imaging quality.

[0134] Example 5

[0135] The following refers to Figures 9 to 10B to describe the optical lens group according to Embodiment 5 of the present application. Figure 9 The structural schematic diagram of the optical lens group according to Embodiment 5 of the present application is shown.

[0136] As Figure 9 shown, the optical lens group may sequentially include, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a stop STO, 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 negative 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 concave 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 concave 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 concave surface. The seventh lens E7 has a positive optical power, its object side surface S13 is a convex surface, and its image side surface S14 is a convex surface. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object to be photographed 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 optical lens group is 1.84 mm, the total length TTL of the optical lens group is 12.59 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the optical lens group, ImgH, is 3.00 mm, the numerical aperture Fno of the optical lens group is 1.43, and the maximum field of view FOV of the optical lens group is 198.0°.

[0139] Table 13 shows the basic parameters of the optical lens group of Example 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 14 and 15 give the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 that can be used for each aspherical mirror surface S3 - S14 in Example 5, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0140]

[0141] Table 13

[0142] Face number A4 A6 A8 A10 A12 A14 S3 1.4055E-02 7.6279E-03 -2.8935E-02 3.5365E-02 -2.5311E-02 1.1698E-02 S4 2.7533E-02 -9.0928E-03 9.5294E-02 -3.5233E-01 6.4801E-01 -6.8931E-01 S5 -2.3087E-02 -1.7767E-03 1.3251E-03 -1.9900E-03 7.1824E-04 8.0023E-05 S6 2.8810E-02 -9.8920E-03 5.1088E-03 -2.8386E-03 1.5029E-03 -4.4490E-04 S7 1.1801E-01 -6.7662E-02 3.5854E-02 -1.4585E-02 3.9183E-03 -5.9607E-04 S8 -4.8313E-02 3.1794E-02 -2.8921E-02 2.0056E-02 -1.0057E-02 3.5511E-03 S9 -7.7595E-02 5.2365E-02 -4.0133E-02 2.4901E-02 -1.1393E-02 3.6629E-03 S10 3.2761E-02 -1.2491E-02 2.8646E-04 2.3384E-03 -1.2367E-03 3.7619E-04 S11 7.6306E-02 -3.7366E-02 1.2366E-02 -2.7312E-03 3.8891E-04 -3.3988E-05 S12 4.1645E-02 -1.1524E-02 2.3337E-03 -3.8923E-04 4.7960E-05 -3.3802E-06 S13 -1.6428E-02 7.1166E-03 -2.6402E-03 7.8004E-04 -1.4648E-04 1.4651E-05 S14 -3.6738E-04 3.9156E-04 2.6924E-04 -8.2108E-05 1.7810E-05 -2.0065E-06

[0143] Table 14

[0144]

[0145]

[0146] Table 15

[0147] Figure 10A Shows the axial chromatic aberration curve of the optical lens group of Example 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens group. Figure 10B Shows the astigmatism curve of the optical lens group of Example 5, which represents the meridional image plane curvature and the sagittal image plane curvature. According to Figures 10A to 10B It can be seen that the optical lens group given in Example 5 can achieve good imaging quality.

[0148] Example 6

[0149] The following refers to Figures 11 to 12B Describe the optical lens group according to Embodiment 6 of the present application. Figure 11 Shows a schematic structural diagram of the optical lens group according to Embodiment 6 of the present application.

[0150] As Figure 11 shown, the optical lens group may sequentially include, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0151] The first lens E1 has a negative 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 positive optical power, its object side S5 is concave, and its image side S6 is convex. The fourth lens E4 has a negative optical power, its object side S7 is concave, 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 convex. The sixth lens E6 has a negative optical power, its object side S11 is concave, and its image side S12 is concave. The seventh lens E7 has a positive optical power, its object side S13 is convex, and its image side S14 is convex. 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.

[0152] In this example, the total effective focal length f of the optical lens group is 1.85 mm, the total length TTL of the optical lens group is 12.59 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical lens group is ImgH = 3.10 mm, the numerical aperture Fno of the optical lens group is 1.43, and the maximum field of view angle FOV of the optical lens group is 209.8°.

[0153] Table 16 shows the basic parameters of the optical lens group of Example 6, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 17 and 18 give the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, and A26 that can be used for the aspherical mirror surfaces S3 - S14 in Example 6, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0154]

[0155]

[0156] Table 16

[0157] Face number A4 A6 A8 A10 A12 A14 S3 1.0393E-02 1.1488E-02 -3.2135E-02 3.8256E-02 -2.7942E-02 1.3498E-02 S4 2.3968E-02 3.4513E-03 3.9903E-02 -1.9154E-01 3.8075E-01 -4.2690E-01 S5 -2.1600E-02 -1.5978E-03 3.2722E-03 -4.0935E-03 1.9760E-03 -3.2100E-04 S6 3.8616E-02 -1.3834E-02 7.7784E-03 -4.4191E-03 2.2366E-03 -6.5515E-04 S7 1.0590E-01 -5.7455E-02 2.9339E-02 -1.1855E-02 3.1738E-03 -4.7625E-04 S8 -6.0998E-02 3.7009E-02 -3.0806E-02 2.1425E-02 -1.1116E-02 4.0144E-03 S9 -6.9222E-02 4.4147E-02 -3.1675E-02 1.8306E-02 -7.7249E-03 2.2585E-03 S10 -2.8365E-04 8.8205E-03 -2.7850E-03 -3.5295E-03 3.7032E-03 -1.6444E-03 S11 7.7827E-02 -2.8683E-02 5.9386E-03 -6.0659E-04 -5.5512E-06 5.2978E-06 S12 5.9209E-02 -2.0318E-02 4.7272E-03 -7.0153E-04 4.9283E-05 7.0125E-07 S13 -2.7586E-02 1.1956E-02 -4.1445E-03 1.0325E-03 -1.6338E-04 1.4087E-05 S14 3.7717E-03 -1.5458E-03 8.6519E-04 -2.1968E-04 3.4658E-05 -2.9035E-06

[0158] Table 17

[0159] Face number A16 A18 A20 A22 A24 A26 S3 -4.3970E-03 9.5681E-04 -1.3356E-04 1.0842E-05 -3.9026E-07 0.0000E+00 S4 2.9820E-01 -1.3589E-01 4.2441E-02 -9.8034E-03 1.6902E-03 -1.5892E-04 S5 3.3409E-06 -3.1494E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 8.5068E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.0857E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 -9.5152E-04 1.3407E-04 -8.4882E-06 -1.4095E-07 3.4164E-08 0.0000E+00 S9 -4.3559E-04 5.1231E-05 -3.0440E-06 2.8909E-08 3.6883E-09 0.0000E+00 S10 4.0922E-04 -5.6318E-05 3.2475E-06 8.9545E-08 -1.4594E-08 0.0000E+00 S11 6.4226E-07 -1.9806E-07 2.2004E-08 -1.4248E-09 0.0000E+00 0.0000E+00 S12 -1.5303E-07 -1.4564E-08 1.3944E-09 0.0000E+00 0.0000E+00 0.0000E+00 S13 -4.7373E-07 -2.1251E-09 -3.6853E-10 0.0000E+00 0.0000E+00 0.0000E+00 S14 8.2517E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0160] Table 18

[0161] Figure 12A Shows the axial chromatic aberration curve of the optical lens group of Example 6, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens group. Figure 12BThe astigmatism curve of the optical lens group of Embodiment 6 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. According to Figures 12A to 12B it can be known that the optical lens group given in Embodiment 6 can achieve good imaging quality.

[0162] In summary, Embodiments 1 to 6 respectively satisfy the relationships shown in Table 19.

[0163]

[0164]

[0165] Table 19

[0166] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (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 optical lens group described above.

[0167] The above description is only the preferred embodiments of this application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, but 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 with similar functions disclosed in this application.

Claims

1. Optical lens group, characterized in that, sequentially including from the object side to the image side along the optical axis: a first lens with negative optical power, its object side is convex and its image side is concave; a second lens with negative optical power, its object side is convex and its image side is concave; a third lens with positive optical power, its object side is concave and its image side is convex; a fourth lens with negative optical power, its object side is concave and its image side is convex; a fifth lens with positive optical power, its object side is convex and its image side is convex; a sixth lens with negative optical power, its object side is concave and its image side is concave; and a seventh lens with positive optical power, its object side is convex and its image side is convex; the number of lenses with optical power in the optical lens group is seven; the optical lens group satisfies: 0.8 < tan(FOV / 4) / Fno ≤ 0.93; and 2.26 ≤ f3 / f ≤ 2.58, wherein, FOV is the maximum field of view angle of the optical lens group, Fno is the numerical aperture of the optical lens group, f3 is the effective focal length of the third lens, and f is the total effective focal length of the optical lens group.

2. The optical lens group according to claim 1, characterized in that, 0.64 ≤ f1 / f2 ≤ 0.74, wherein, f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.

3. The optical lens group according to claim 1, characterized in that, 4.0 < TTL / ImgH ≤ 4.20, wherein, TTL is the distance along the optical axis from the object side of the first lens to the imaging surface of the optical lens group, and ImgH is half of the diagonal length of the effective pixel area of the imaging surface.

4. The optical lens group according to claim 2, characterized in that, the object side of the fourth lens is concave, and 0.75 ≤ R6 / R7 ≤ 0.84, wherein, R6 is the radius of curvature of the image side of the third lens and R7 is the radius of curvature of the object side of the fourth lens.

5. The optical lens group according to claim 1, characterized in that, 0.4 < T34 / (CT4 - T34) < 1.1, wherein, T34 is the interval distance along the optical axis between the third lens and the fourth lens, and CT4 is the central thickness of the fourth lens along the optical axis.

6. The optical lens group according to claim 1, characterized in that, the optical lens group further includes a diaphragm, there is at least one lens made of plastic and at least one lens made of glass between the diaphragm and the object to be photographed, there are at least three lenses made of plastic between the diaphragm and the imaging surface of the optical lens group.

7. The optical lens group according to claim 1, characterized in that, 0.5 < (N1 - N2) / (N3 - N2) ≤ 0.76, wherein, N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens.

8. The optical lens group according to claim 1, characterized in that, 0.46 ≤ T56 / T67 ≤ 0.65, Among them, T56 is the distance between the fifth lens and the sixth lens along the optical axis, and T67 is the distance between the sixth lens and the seventh lens along the optical axis.

9. The optical lens group according to claim 1, characterized in that, 0.34 ≤ SAG71 / CT7 < 0.4, wherein, SAG71 is the distance from the intersection point 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 in the optical axis direction, and CT7 is the central thickness of the seventh lens along the optical axis.

10. The optical lens group according to claim 1, characterized in that, 0.77 ≤ DT32 / DT41 ≤ 0.91, wherein, DT32 is the effective radius of the image side surface of the third lens, and DT41 is the effective radius of the object side surface of the fourth lens.

11. The optical lens group according to claim 1, characterized in that, 1.31 ≤ f56 / f7 ≤ 2.09, wherein, f56 is the combined focal length of the fifth lens and the sixth lens, and f7 is the effective focal length of the seventh lens.

12. The optical lens group according to claim 1, characterized in that, 0.33 ≤ T45 / SAG51 ≤ 0.43, wherein, T45 is the distance between the fourth lens and the fifth lens along the optical axis, and SAG51 is the distance from the intersection point of the object side surface of the fifth lens and the optical axis to the vertex of the effective radius of the object side surface of the fifth lens in the optical axis direction.

13. An optical lens group, characterized in that, sequentially includes from the object side to the image side along the optical axis: a first lens with negative optical power, whose object side surface is convex and image side surface is concave; a second lens with negative optical power, whose object side surface is convex and image side surface is concave; a third lens with positive optical power, whose object side surface is concave and image side surface is convex; a fourth lens with negative optical power, whose object side surface is concave and image side surface is convex; a fifth lens with positive optical power, whose object side surface is convex and image side surface is convex; a sixth lens with negative optical power, whose object side surface is concave and image side surface is concave; and a seventh lens with positive optical power, whose object side surface is convex and image side surface is convex; the number of lenses with optical power in the optical lens group is seven; the optical lens group satisfies: 0.8 < tan(FOV / 4) / Fno ≤ 0.93; and 0.75 ≤ R6 / R7 ≤ 0.84, wherein, FOV is the maximum field of view angle of the optical lens group, Fno is the numerical aperture of the optical lens group, R6 is the curvature radius of the image side surface of the third lens, and R7 is the curvature radius of the object side surface of the fourth lens.

14. The optical lens group according to claim 13, characterized in that, 2.26 ≤ f3 / f ≤ 2.58, wherein, f3 is the effective focal length of the third lens, and f is the total effective focal length of the optical lens group.

15. The optical lens group according to claim 13, characterized in that, the optical lens group further includes a diaphragm, Between the diaphragm and the object to be photographed, there is at least one lens made of plastic and at least one lens made of glass. Between the diaphragm and the imaging surface of the optical lens group, there are at least three lenses made of plastic.

16. The optical lens group according to claim 13, characterized in that 0.34 ≤ SAG71 / CT7 < 0.4, wherein, SAG71 is the distance from the intersection of the object side of the seventh lens and the optical axis to the vertex of the effective radius of the object side of the seventh lens in the direction of the optical axis, and CT7 is the central thickness of the seventh lens along the optical axis.

17. The optical lens group according to claim 13, characterized in that 0.77 ≤ DT32 / DT41 ≤ 0.91, wherein, DT32 is the effective radius of the image side of the third lens, and DT41 is the effective radius of the object side of the fourth lens.

18. The optical lens group according to claim 13, characterized in that 1.31 ≤ f56 / f7 ≤ 2.09, wherein, f56 is the combined focal length of the fifth lens and the sixth lens, and f7 is the effective focal length of the seventh lens.

19. The optical lens group according to claim 13, characterized in that 0.33 ≤ T45 / SAG51 ≤ 0.43, wherein, T45 is the distance between the fourth lens and the fifth lens along the optical axis, and SAG51 is the distance from the intersection of the object side of the fifth lens and the optical axis to the vertex of the effective radius of the object side of the fifth lens in the direction of the optical axis.

20. The optical lens group according to claim 13, characterized in that 0.64 ≤ f1 / f2 ≤ 0.74, wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

21. The optical lens group according to claim 13, characterized in that 4.0 < TTL / ImgH ≤ 4.20, wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens group along the optical axis, and ImgH is half of the diagonal length of the effective pixel area of the imaging surface.

22. The optical lens group according to claim 13, characterized in that 0.4 < T34 / (CT4 - T34) < 1.1, wherein, T34 is the distance between the third lens and the fourth lens along the optical axis, and CT4 is the central thickness of the fourth lens along the optical axis.

23. The optical lens group according to claim 13, characterized in that 0.5 < (N1 - N2) / (N3 - N2) ≤ 0.76, wherein, N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and N3 is the refractive index of the third lens.

24. The optical lens group according to claim 13, characterized in that 0.46 ≤ T56 / T67 ≤ 0.65, wherein, T56 is the distance between the fifth lens and the sixth lens along the optical axis, and T67 is the distance between the sixth lens and the seventh lens along the optical axis.

Images