Camera 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 having a focal power, whose image side is convex; a second lens having a positive focal power, whose object side is convex; a diaphragm; a third lens having a focal power, whose image side is convex; a fourth lens having a focal power, whose object side is concave; a fifth lens having a focal power, whose image side is convex; a sixth lens having a positive focal power, whose object side is convex; a seventh lens having a negative focal power, whose object side is convex and image side is concave; at least one mirror surface among the object side of the first lens to the image side of the seventh lens is an aspherical mirror surface; and the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the camera lens group, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens group, and the total effective focal length f of the camera lens group satisfy: 5.00 mm < TTL / ImgH × f < 6.00 mm.

Description

Technical Field

[0001] This application relates to the field of optical elements, and specifically, to a camera lens group. Background Art

[0002] In recent years, the development of camera lens groups for portable electronic products such as mobile phones has been very rapid. Camera lens groups for portable electronic products such as mobile phones with high pixels and large image surfaces have become standard configurations for portable electronic products such as mobile phones. In theory, the more lens elements in a camera lens group, the stronger the ability to balance aberrations, and the more significantly the imaging quality of the camera lens group can be improved. However, an increase in the number of lens elements will also increase the size of the lens, which is contrary to the development trend of ultra-thin miniaturization of current portable electronic products such as mobile phones. Summary of the Invention

[0003] This application provides such a camera lens group, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a focal power, whose image side is convex; a second lens with a positive focal power, whose object side is convex; an aperture stop; a third lens with a focal power, whose image side is convex; a fourth lens with a focal power, whose object side is concave; a fifth lens with a focal power, whose image side is convex; a sixth lens with a positive focal power, whose object side is convex; a seventh lens with a negative focal power, whose object side is convex and image side is concave.

[0004] In one embodiment, at least one of the surfaces from the object side of the first lens to the image side of the seventh lens is an aspherical surface.

[0005] In one embodiment, the distance TTL from the object side of the first lens to the imaging surface of the camera lens group on the optical axis, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the camera lens group, and the total effective focal length f of the camera lens group can satisfy: 5.00 mm < TTL / ImgH × f < 6.00 mm.

[0006] In one embodiment, the combined focal length f56 of the fifth lens and the sixth lens and the distance BFL from the image side of the seventh lens to the imaging surface of the camera lens group on the optical axis can satisfy: 1.50 < f56 / BFL < 5.00.

[0007] In one embodiment, the total effective focal length f of the camera lens group, the effective focal length f2 of the second lens, and the effective focal length f6 of the sixth lens can satisfy: 1.50 < (f / f2) + (f / f6) < 2.50.

[0008] In one embodiment, the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens can satisfy: 0.50 < f12 / f56 < 2.50.

[0009] In one embodiment, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens may satisfy: 3.00 < (R13 + R14) / (R13 - R14) < 4.50.

[0010] In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 0.50 < CT1 / CT7 < 2.00.

[0011] In one embodiment, the central thickness CT4 of the fourth lens on the optical axis and the interval distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 0.50 < CT4 / T45 < 4.50.

[0012] In one embodiment, the distance SAG12 on the optical axis from the intersection of the image side surface of the first lens and the optical axis to the vertex of the effective radius of the image side surface of the first lens and the distance SAG21 on the optical axis from the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens may satisfy: 1.00 < (SAG21 + SAG12) / (SAG21 - SAG12) < 3.00.

[0013] In one embodiment, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens may satisfy: 1.50 < ET4 / ET5 < 3.50.

[0014] In one embodiment, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT72 of the image side surface of the seventh lens may satisfy: 2.50 < (DT11 + DT72) / (DT72 - DT11) < 5.00.

[0015] In one embodiment, the total effective focal length f of the camera lens group and the radius of curvature R11 of the object side surface of the sixth lens may satisfy: 0.50 < f / R11 < 2.00.

[0016] In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the camera lens group and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the camera lens group may satisfy: TTL / ImgH < 1.50.

[0017] With the above configuration, the camera lens group according to the present application may have at least one beneficial effect such as ultra-thin, miniaturized, large image plane, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 Shows a schematic structural diagram of a camera lens group according to Embodiment 1 of the present application;

[0020] Figures 2A to 2D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the camera lens group of Embodiment 1;

[0021] Figure 3 Shows a schematic structural diagram of a camera lens group according to Embodiment 2 of the present application;

[0022] Figures 4A to 4D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the camera lens group of Embodiment 2;

[0023] Figure 5 Shows a schematic structural diagram of a camera lens group according to Embodiment 3 of the present application;

[0024] 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;

[0025] Figure 7 Shows a schematic structural diagram of a camera lens group according to Embodiment 4 of the present application;

[0026] 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;

[0027] Figure 9 Shows a schematic structural diagram of a camera lens group according to Embodiment 5 of the present application;

[0028] 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;

[0029] Figure 11 Shows a schematic structural diagram of a camera lens group according to Embodiment 6 of the present application;

[0030] 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;

[0031] Figure 13 Shows a schematic structural diagram of a camera lens group according to Embodiment 7 of the present application;

[0032] 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;

[0033] Figure 15 shows a schematic structural diagram of a camera lens group according to Embodiment 8 of the present application; and

[0034] 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. Detailed Embodiments

[0035] 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.

[0036] 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 features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0037] In the drawings, for the sake of clarity, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0038] In this document, 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 surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0039] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including having", when used in this specification, indicate 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". And the term "exemplary" is intended to refer to an example or illustration.

[0040] 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 commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formalized manner unless expressly so defined herein.

[0041] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will detail this application with reference to the accompanying drawings and in combination with the embodiments.

[0042] The features, principles and other aspects of this application will be described in detail below.

[0043] The camera lens group according to an exemplary embodiment of this 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.

[0044] In the exemplary embodiment, the first lens may have positive or negative optical power, and its image side may be convex; the second lens may have positive optical power, and its object side may be convex; the third lens may have positive or negative optical power, and its image side may be convex; the fourth lens may have positive or negative optical power, and its object side may be concave; the fifth lens may have positive or negative optical power, and its image side may be convex; the sixth lens may have positive optical power, and its object side may be convex; the seventh lens may have negative optical power, and its object side may be convex and its image side may be concave.

[0045] In the exemplary embodiment, the camera lens group according to this application may satisfy: 5.00 mm < TTL / ImgH × f < 6.00 mm, where TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the camera lens group, ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens group, and f is the total effective focal length of the camera lens group. More specifically, TTL, ImgH and f may further satisfy: 5.10 mm < TTL / ImgH × f < 5.80 mm. Satisfying 5.00 mm < TTL / ImgH × f < 6.00 mm can effectively reduce the total size of the camera lens group while obtaining a larger focal length, realizing the ultra-thin characteristics and miniaturization of the camera lens group, so that the camera lens group can better be applied to more and more ultra-thin electronic products on the market.

[0046] In an exemplary embodiment, the camera lens group according to the present application can satisfy: 1.50 < f56 / BFL < 5.00, where f56 is the combined focal length of the fifth lens and the sixth lens, and BFL is the distance from the image side of the seventh lens to the imaging surface of the camera lens group on the optical axis. More specifically, f56 and BFL can further satisfy: 1.70 < f56 / BFL < 4.80. Satisfying 1.50 < f56 / BFL < 5.00 can effectively reduce the size of the camera lens group, and since the combination of the fifth lens and the sixth lens has a positive optical power, it is beneficial to the optical power distribution of the entire camera lens group and avoids excessive concentration of optical power.

[0047] In an exemplary embodiment, the camera lens group according to the present application can satisfy: 1.50 < (f / f2) + (f / f6) < 2.50, where f is the total effective focal length of the camera lens group, f2 is the effective focal length of the second lens, and f6 is the effective focal length of the sixth lens. More specifically, f, f2, and f6 can further satisfy: 1.60 < (f / f2) + (f / f6) < 2.20. Satisfying 1.50 < (f / f2) + (f / f6) < 2.50 can make the camera lens group more effectively shorten the size, so that while maintaining the ultra-thin characteristics of the camera lens group, it avoids excessive concentration of the optical power of the camera lens group, and cooperates with other lenses to better correct the aberration of the camera lens group.

[0048] In an exemplary embodiment, the camera lens group according to the present application can satisfy: 0.50 < f12 / f56 < 2.50, where f12 is the combined focal length of the first lens and the second lens, and f56 is the combined focal length of the fifth lens and the sixth lens. More specifically, f12 and f56 can further satisfy: 0.80 < f12 / f56 < 2.10. Satisfying 0.50 < f12 / f56 < 2.50 can effectively reduce the aberration of the entire camera lens group, reduce the sensitivity of the camera lens group, and avoid poor processability caused by excessive concentration of optical power.

[0049] In an exemplary embodiment, the camera lens group according to the present application can satisfy: 3.00 < (R13 + R14) / (R13 - R14) < 4.50, where R13 is the curvature radius of the object side of the seventh lens, and R14 is the curvature radius of the image side of the seventh lens. More specifically, R13 and R14 can further satisfy: 3.00 < (R13 + R14) / (R13 - R14) < 4.30. Satisfying 3.00 < (R13 + R14) / (R13 - R14) < 4.50 can effectively correct the chromatic aberration of the camera lens group, achieve the balance of various aberrations, and can effectively reduce the size of the camera lens group, so that the optical power of the camera lens group is reasonably distributed.

[0050] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.50 < CT1 / CT7 < 2.00, where CT1 is the central thickness of the first lens on the optical axis, and CT7 is the central thickness of the seventh lens on the optical axis. More specifically, CT1 and CT7 may further satisfy: 0.70 < CT1 / CT7 < 2.00. Satisfying 0.50 < CT1 / CT7 < 2.00 can enable the camera lens group to better balance the chromatic aberration of the camera lens group, effectively control the distortion amount of the camera lens group, effectively avoid the problem of difficult processing due to the seventh lens being too thin, and can reduce the size of the camera lens group to maintain its ultra-thin characteristics.

[0051] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.50 < CT4 / T45 < 4.50, where CT4 is the central thickness of the fourth lens on the optical axis, and T45 is the distance between the fourth lens and the fifth lens on the optical axis. More specifically, CT4 and T45 may further satisfy: 0.80 < CT4 / T45 < 4.20. Satisfying 0.50 < CT4 / T45 < 4.50 can effectively reduce the risk of ghost images generated by the camera lens group and contribute to reducing the size of the camera lens group.

[0052] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 1.00 < (SAG21 + SAG12) / (SAG21 - SAG12) < 3.00, where SAG12 is the distance from the intersection of the image side of the first lens and the optical axis to the vertex of the effective radius of the image side of the first lens on the optical axis, and SAG21 is the distance from the intersection of the object side of the second lens and the optical axis to the vertex of the effective radius of the object side of the second lens on the optical axis. Satisfying 1.00 < (SAG21 + SAG12) / (SAG21 - SAG12) < 3.00 can help improve the spherical aberration of the intermediate field of view and the coma of the edge field of view, enabling the camera lens group to have better aberration correction ability; it can also help increase the effective focal length of the camera lens group while maintaining the imaging quality of the camera lens group; and it can also help increase the relative illumination of the camera lens group and improve the imaging quality of the camera lens group in a darker environment.

[0053] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 1.50 < ET4 / ET5 < 3.50, where ET4 is the edge thickness of the fourth lens, and ET5 is the edge thickness of the fifth lens. More specifically, ET4 and ET5 may further satisfy: 1.60 < ET4 / ET5 < 3.30. Satisfying 1.50 < ET4 / ET5 < 3.50 can balance the distortion influence amount of the camera lens group while reducing the size of the camera lens group and maintaining good processability.

[0054] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 2.50 < (DT11 + DT72) / (DT72 - DT11) < 5.00, where DT11 is the maximum effective radius of the object side surface of the first lens, and DT72 is the maximum effective radius of the image side surface of the seventh lens. More specifically, DT11 and DT72 may further satisfy: 2.50 < (DT11 + DT72) / (DT72 - DT11) < 4.60. Satisfying 2.50 < (DT11 + DT72) / (DT72 - DT11) < 5.00 can effectively increase the light transmission amount of the camera lens group, improve the relative illuminance of the camera lens group, especially the peripheral field of view, so that the camera lens group still has good imaging quality in a relatively dark environment.

[0055] In an exemplary embodiment, the camera lens group according to the present application may satisfy: 0.50 < f / R11 < 2.00, where f is the total effective focal length of the camera lens group, and R11 is the curvature radius of the object side surface of the sixth lens. Satisfying 0.50 < f / R11 < 2.00 can enable the camera lens group to have better chromatic aberration correction ability, reduce the sensitivity of the camera lens group, and can effectively avoid a series of processing problems caused by poor processability of the sixth lens.

[0056] In an exemplary embodiment, the camera lens group according to the present application may satisfy: TTL / ImgH < 1.50, where TTL is the distance from the object side surface of the first lens to the imaging surface of the camera lens group on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the camera lens group. Satisfying TTL / ImgH < 1.50 can effectively reduce the total size of the camera lens group, realize the ultra-thin characteristics and miniaturization of the camera lens group, so that the camera lens group can be better applied to more and more ultra-thin electronic products on the market.

[0057] In an exemplary embodiment, the camera lens group according to the present application further includes a diaphragm disposed between the second lens and the third lens. Optionally, the above camera lens group may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0058] The camera lens group according to the above embodiment of the present application may adopt multiple lenses, such as the seven lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the volume of the camera lens group can be effectively reduced and the processability of the camera lens group can be improved, making the camera lens group more conducive to production and processing and applicable to portable electronic products. The camera lens group configured as above may have characteristics such as miniaturization, large aperture, ultra-thin, large viewing angle, large image plane, and good imaging quality.

[0059] 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 object-side surface of the first lens to the image-side surface of the seventh lens is an aspherical mirror surface. The characteristics of an aspherical lens are 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, 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 as much as possible the aberration that appears during imaging, 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.

[0060] 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 may also include other numbers of lenses.

[0061] The following further describes specific embodiments of the imaging lens group applicable to the above embodiments with reference to the accompanying drawings.

[0062] Example 1

[0063] The following refers to Figures 1 to 2D Describe the imaging lens group according to Embodiment 1 of the present application. Figure 1 A schematic structural diagram of the imaging lens group according to Embodiment 1 of the present application is shown.

[0064] As Figure 1 shown, the imaging lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0065] The first lens E1 has a negative focal power, its object side S1 is concave, and its image side S2 is convex. 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 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 negative focal power, its object side S9 is concave, and its image side S10 is convex. 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 convex, 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.

[0066] Table 1 shows the basic parameter table of the camera lens group in Example 1. Among them, the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0067]

[0068] Table 1

[0069] In this example, the total effective focal length f of the camera lens group is 3.85 mm, the total length TTL of the camera 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 camera lens group) is 6.79 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the camera lens group ImgH is 4.63 mm, the aperture value Fno of the camera lens group is 1.87, and the maximum half field of view Semi-FOV of the camera lens group is 58.4°.

[0070] 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. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0071]

[0072] 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. 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 .

[0073] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.8823E-02 -3.5186E-03 1.6422E-03 -6.0836E-04 1.8388E-04 -4.1356E-05 6.1150E-06 -5.1163E-07 1.8085E-08 S2 4.2455E-02 -3.2589E-02 5.1228E-02 -5.7344E-02 4.6602E-02 -2.5818E-02 9.2325E-03 -1.9121E-03 1.7517E-04 S3 8.7196E-03 -3.9884E-03 -5.0288E-02 1.8149E-01 -2.7853E-01 2.3085E-01 -1.0020E-01 1.8024E-02 0.0000E+00 S4 -3.1135E-02 7.1826E-03 -5.0242E-03 4.2321E-03 -1.9445E-02 6.9140E-02 -1.0088E-01 6.6945E-02 -1.6320E-02 S5 -3.8409E-02 -9.5491E-03 -3.7975E-02 1.0407E-01 -1.7609E-01 1.3307E-01 -6.8170E-03 -5.1716E-02 2.1943E-02 S6 -8.7863E-02 -1.9849E-02 1.6295E-01 -5.1221E-01 9.5289E-01 -1.1178E+00 7.9319E-01 -3.1156E-01 5.1994E-02 S7 -1.8039E-01 6.7848E-02 -2.2055E-01 5.7289E-01 -8.3184E-01 7.2103E-01 -3.8299E-01 1.1796E-01 -1.6192E-02 S8 -6.4950E-02 2.1046E-02 -4.7501E-02 7.7917E-02 -6.7687E-02 3.1897E-02 -7.7712E-03 8.2283E-04 -1.2356E-05 S9 1.0029E-01 1.8395E-03 -8.9201E-02 1.0027E-01 -5.9605E-02 2.1475E-02 -4.6950E-03 5.7714E-04 -3.0948E-05 S10 -9.0391E-02 4.4683E-02 -2.2636E-02 1.0049E-02 -1.4573E-03 -5.6142E-04 2.8389E-04 -4.8002E-05 2.9495E-06 S11 -6.6096E-03 -4.8132E-03 -4.8903E-03 -5.3714E-04 2.1221E-03 -9.4223E-04 1.8774E-04 -1.7888E-05 6.6131E-07 S12 2.0611E-01 -1.0968E-01 2.2392E-02 9.6066E-04 -1.6491E-03 3.9935E-04 -4.7008E-05 2.8013E-06 -6.7562E-08 S13 -1.1392E-01 -4.0083E-02 3.1177E-02 -8.3259E-03 1.2531E-03 -1.1630E-04 6.6255E-06 -2.1329E-07 2.9778E-09 S14 -1.4011E-01 4.1436E-02 -9.6523E-03 1.7287E-03 -2.0728E-04 1.5094E-05 -6.0932E-07 1.1394E-08 -5.3081E-11

[0074] Table 2

[0075] Figure 2A shows the axial chromatic aberration curve of the camera 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 camera lens group of Embodiment 1, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 2C shows the distortion curve of the camera lens group of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2D shows the longitudinal chromatic aberration curve of the camera lens group of Embodiment 1, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 2A to 2D it can be known that the camera lens group given in Embodiment 1 can achieve good imaging quality.

[0076] Example 2

[0077] The following refers to Figures 3 to 4D to describe the camera 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 camera lens group according to Embodiment 2 of the present application.

[0078] As Figure 3 shown, the camera lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0079] The first lens E1 has a negative focal power, its object side S1 is concave, and its image side S2 is convex. The second lens E2 has a positive focal power, its object side S3 is convex, and its image side S4 is convex. 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 negative focal power, its object side S9 is concave, and its image side S10 is convex. 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 convex, 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.

[0080] In this example, the total effective focal length f of the camera lens group is 3.87 mm, the total length TTL of the camera lens group is 6.84 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the camera lens group is ImgH = 4.60 mm, the aperture value Fno of the camera lens group is 1.90, and the maximum half field of view Semi-FOV of the camera lens group is 61.0°.

[0081] Table 3 shows the basic parameter table of the camera 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.

[0082]

[0083] Table 3

[0084]

[0085]

[0086] Table 4

[0087] Figure 4A Shows the axial chromatic aberration curve of the camera 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 camera 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 camera 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 camera 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 4DIt can be seen that the camera lens group given in Embodiment 2 can achieve good imaging quality.

[0088] Example 3

[0089] The following refers to Figures 5 to 6D a description of the camera lens group according to Embodiment 3 of the present application. Figure 5 Fig. shows a schematic structural diagram of the camera lens group according to Embodiment 3 of the present application.

[0090] As Figure 5 shown, the camera lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0091] The first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is convex. 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 positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is concave, 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 convex. 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 convex, 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.

[0092] In this example, the total effective focal length f of the camera lens group is 3.90 mm, the total length TTL of the camera lens group is 6.80 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the camera lens group is ImgH of 4.60 mm, the aperture value Fno of the camera lens group is 1.77, and the maximum half field of view Semi-FOV of the camera lens group is 58.2°.

[0093] 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 higher-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.

[0094]

[0095]

[0096] Table 5

[0097] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.1345E-02 -1.0103E-02 5.7263E-03 -2.7023E-03 9.2944E-04 -2.1791E-04 3.2454E-05 -2.7427E-06 9.9381E-08 S2 2.0820E-02 3.0032E-02 -5.6134E-02 7.1524E-02 -5.9387E-02 3.2114E-02 -1.0782E-02 2.0339E-03 -1.6358E-04 S3 -1.9835E-02 3.9651E-02 -5.6845E-02 5.1493E-02 -9.0485E-03 -3.1212E-02 3.4185E-02 -1.4961E-02 2.5251E-03 S4 -2.5122E-02 -5.0878E-03 7.8149E-02 -2.7354E-01 5.5152E-01 -6.6802E-01 4.8284E-01 -1.9193E-01 3.2451E-02 S5 -2.8950E-02 8.5650E-03 -5.4814E-02 1.0393E-01 -1.1326E-01 4.9532E-02 1.7194E-02 -2.6254E-02 7.5087E-03 S6 -6.0536E-02 -6.0850E-03 2.6622E-02 -1.0534E-01 2.1962E-01 -2.6954E-01 1.9368E-01 -7.5603E-02 1.2305E-02 S7 -1.1632E-01 9.0070E-02 -3.3079E-01 6.9532E-01 -8.5974E-01 6.6097E-01 -3.0648E-01 7.7437E-02 -8.0789E-03 S8 -5.4254E-02 1.4753E-01 -2.7592E-01 2.8197E-01 -1.7610E-01 6.8768E-02 -1.5935E-02 1.9112E-03 -8.1460E-05 S9 -4.8121E-02 3.2771E-01 -5.1012E-01 4.4693E-01 -2.5440E-01 9.5452E-02 -2.2484E-02 2.9902E-03 -1.7088E-04 S10 -2.1941E-01 2.7521E-01 -2.9213E-01 2.2018E-01 -1.1364E-01 3.8499E-02 -7.9984E-03 9.1478E-04 -4.3993E-05 S11 1.9974E-02 -1.2470E-03 -4.0937E-02 3.7847E-02 -1.9407E-02 5.9577E-03 -1.0655E-03 1.0192E-04 -4.0210E-06 S12 2.7262E-01 -1.9734E-01 9.0499E-02 -3.1311E-02 7.6683E-03 -1.2294E-03 1.2103E-04 -6.6177E-06 1.5380E-07 S13 -1.2891E-01 -4.8007E-02 3.9125E-02 -1.0805E-02 1.6551E-03 -1.5429E-04 8.7413E-06 -2.7778E-07 3.8075E-09 S14 -2.5237E-01 8.6783E-02 -2.4182E-02 4.9820E-03 -6.9494E-04 6.2190E-05 -3.3933E-06 1.0258E-07 -1.3178E-09

[0098] Table 6

[0099] Figure 6A shows the axial chromatic aberration curve of the camera 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 shows the astigmatism curve of the camera lens group of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C shows the distortion curve of the camera lens group of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6D shows the lateral chromatic aberration curve of the camera lens group of Embodiment 3, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 6A to 6D it can be seen that the camera lens group given in Embodiment 3 can achieve good imaging quality.

[0100] Example 4

[0101] The following refers to Figures 7 to 8D describes the camera lens group according to Embodiment 4 of the present application. Figure 7 shows the structural schematic diagram of the camera lens group according to Embodiment 4 of the present application.

[0102] As Figure 7 shown, the camera lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0103] The first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is convex. 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 positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has a negative optical power, its object side surface S9 is concave, and its image side surface S10 is convex. 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 convex, 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.

[0104] In this example, the total effective focal length f of the camera lens group is 3.91 mm, the total length TTL of the camera lens group is 6.80 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the camera lens group, ImgH, is 4.60 mm, the f-number Fno of the camera lens group is 1.80, and the maximum semi-field angle Semi-FOV of the camera lens group is 58.4°.

[0105] Table 7 shows the basic parameter table of the camera lens group of Example 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 Example 4, where each aspherical surface type can be defined by formula (1) given in Example 1 above.

[0106]

[0107] Table 7

[0108]

[0109]

[0110] Table 8

[0111] Figure 8A Shows the axial chromatic aberration curve of the camera lens group of Example 4, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 8B Shows the astigmatism curve of the camera lens group of Example 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8C Shows the distortion curve of the camera lens group of Example 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8D Shows the lateral chromatic aberration curve of the camera lens group of Example 4, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 8A to 8D It can be seen that the camera lens group given in Example 4 can achieve good imaging quality.

[0112] Example 5

[0113] The following refers to Figures 9 to 10D describes the camera lens group according to Embodiment 5 of the present application. Figure 9 Shows a schematic structural diagram of the camera lens group according to Embodiment 5 of the present application.

[0114] As Figure 9 shown, the camera lens group includes, in order from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0115] The first lens E1 has a negative focal power, its object side S1 is concave, and its image side S2 is convex. 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 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 negative focal power, its object side S9 is concave, and its image side S10 is convex. 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 convex, 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.

[0116] In this example, the total effective focal length f of the camera lens group is 3.86 mm, the total length TTL of the camera lens group is 6.84 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the camera lens group is ImgH = 4.71 mm, the aperture value Fno of the camera lens group is 1.87, and the maximum half field of view Semi - FOV of the camera lens group is 52.8°.

[0117] Table 9 shows the basic parameter table of the camera 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 Example 1 above.

[0118]

[0119] Table 9

[0120] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.2383E-02 -4.2413E-03 1.7543E-03 -5.6301E-04 1.4583E-04 -2.9458E-05 4.1658E-06 -3.4901E-07 1.2693E-08 S2 4.0148E-02 -3.1033E-02 5.3991E-02 -6.2988E-02 5.1140E-02 -2.7582E-02 9.4623E-03 -1.8674E-03 1.6279E-04 S3 1.0834E-02 -3.6807E-02 1.1034E-01 -2.2100E-01 3.2070E-01 -3.1237E-01 1.9235E-01 -6.7376E-02 1.0261E-02 S4 -2.8097E-02 2.0917E-03 1.8140E-02 -6.7562E-02 1.3165E-01 -1.4253E-01 8.2236E-02 -2.0483E-02 1.0302E-03 S5 -3.8404E-02 2.6411E-03 -1.4670E-01 5.5003E-01 -1.2130E+00 1.5818E+00 -1.2145E+00 5.0102E-01 -8.4712E-02 S6 -7.8471E-02 -4.2594E-02 2.0931E-01 -5.4561E-01 9.2747E-01 -1.0447E+00 7.2556E-01 -2.8083E-01 4.6373E-02 S7 -1.5997E-01 7.5572E-03 -1.0083E-01 4.1631E-01 -6.8846E-01 6.1876E-01 -3.3526E-01 1.0752E-01 -1.5887E-02 S8 -4.3414E-02 -3.1812E-02 2.9634E-02 -4.9965E-03 -1.7139E-03 -5.5479E-03 6.2428E-03 -2.2318E-03 2.7839E-04 S9 1.4273E-01 -5.6158E-02 -3.2930E-02 5.7539E-02 -3.5154E-02 1.2056E-02 -2.4120E-03 2.6027E-04 -1.1678E-05 S10 -5.4133E-02 1.0391E-02 2.8318E-03 -7.4203E-03 5.9361E-03 -2.0535E-03 3.5031E-04 -2.9029E-05 9.1773E-07 S11 -3.7726E-03 -5.7112E-03 -4.8326E-03 2.5074E-03 -5.7981E-04 8.9196E-05 -1.3133E-05 1.5925E-06 -8.4725E-08 S12 1.9778E-01 -1.1322E-01 3.4679E-02 -6.9287E-03 8.6502E-04 -5.3929E-05 -2.9644E-07 2.3920E-07 -9.5670E-09 S13 -1.1566E-01 -4.0781E-02 3.0935E-02 -7.9602E-03 1.1355E-03 -9.8354E-05 5.1588E-06 -1.5113E-07 1.9013E-09 S14 -2.3838E-01 7.6950E-02 -2.0128E-02 3.9077E-03 -5.1293E-04 4.3151E-05 -2.2152E-06 6.3108E-08 -7.6517E-10

[0121] Table 10

[0122] Figure 10A Shows the axial chromatic aberration curve of the camera 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 camera 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 camera lens group of Example 5, which represents the distortion magnitude values corresponding to different image heights. Figure 10D Shows the longitudinal chromatic aberration curve of the camera lens group of Example 5, which represents the deviation of different image heights on the imaging surface after light rays pass through the lens. According to Figures 10A to 10D It can be seen that the camera lens group given in Example 5 can achieve good imaging quality.

[0123] Example 6

[0124] The following refers 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 a camera lens group according to Embodiment 6 of the present application is shown.

[0125] As Figure 11 shown, the camera lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0126] The first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is convex. 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 positive optical power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. 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 convex, 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.

[0127] In this example, the total effective focal length f of the camera lens group is 3.51 mm, the total length TTL of the camera lens group is 6.72 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the camera lens group is ImgH = 4.55 mm, the aperture value Fno of the camera lens group is 1.90, and the maximum half field of view Semi-FOV of the camera lens group is 60.9°.

[0128] 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 higher-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 6, and each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0129]

[0130]

[0131] Table 11

[0132] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.1651E-02 -1.2043E-02 8.2064E-03 -4.7131E-03 1.9461E-03 -5.3796E-04 9.3326E-05 -9.1296E-06 3.8237E-07 S2 3.2583E-02 -8.3560E-03 1.4815E-02 -1.2030E-02 2.9207E-03 3.8866E-03 -3.6445E-03 1.2346E-03 -1.5254E-04 S3 -2.9809E-03 -2.5456E-02 1.0207E-01 -2.0710E-01 2.5935E-01 -2.0066E-01 9.4003E-02 -2.4349E-02 2.7437E-03 S4 -2.8802E-02 4.9162E-03 2.4265E-02 -9.1705E-02 1.9987E-01 -2.5780E-01 1.9616E-01 -7.9318E-02 1.2831E-02 S5 -2.2007E-02 -7.7605E-02 3.4347E-01 -9.6384E-01 1.6648E+00 -1.8390E+00 1.2591E+00 -4.8926E-01 8.2673E-02 S6 -9.3022E-02 2.0446E-01 -6.5684E-01 1.3086E+00 -1.6190E+00 1.1937E+00 -4.8936E-01 9.1009E-02 -3.0453E-03 S7 -3.0291E-01 7.5383E-01 -2.0121E+00 3.5533E+00 -3.9749E+00 2.7493E+00 -1.0893E+00 1.8962E-01 8.7933E-03 S8 -6.8590E-01 1.6749E+00 -2.5009E+00 2.3257E+00 -1.3816E+00 5.2218E-01 -1.1930E-01 1.3895E-02 -1.8152E-04 S9 -8.2605E-01 2.0649E+00 -2.8222E+00 2.3474E+00 -1.2464E+00 4.2541E-01 -9.0418E-02 1.0953E-02 -6.0684E-04 S10 -1.9682E-01 3.0718E-01 -2.8785E-01 1.6211E-01 -5.7140E-02 1.2706E-02 -1.6316E-03 9.1201E-05 0.0000E+00 S11 1.1785E-01 -1.3902E-01 7.4202E-02 -2.2235E-02 2.7675E-03 2.3965E-04 -1.2089E-04 1.4332E-05 -5.9623E-07 S12 2.6694E-01 -2.5712E-01 1.4831E-01 -5.5108E-02 1.3064E-02 -1.9513E-03 1.7752E-04 -8.9842E-06 1.9407E-07 S13 -1.2025E-01 -4.1062E-02 3.2191E-02 -8.4642E-03 1.2314E-03 -1.0866E-04 5.8045E-06 -1.7317E-07 2.2186E-09 S14 -2.3725E-01 7.4041E-02 -1.7552E-02 3.0794E-03 -3.7780E-04 3.0537E-05 -1.5267E-06 4.2556E-08 -5.0521E-10

[0133] Table 12

[0134] Figure 12A shows the axial chromatic aberration curve of the camera lens group of Example 6, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 12B shows the astigmatism curve of the camera lens group of Example 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C shows the distortion curve of the camera lens group of Example 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12D shows the lateral chromatic aberration curve of the camera lens group of Example 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 camera lens group given in Example 6 can achieve good imaging quality.

[0135] Example 7

[0136] The following refers to Figures 13 to 14D describes the camera lens group according to Embodiment 7 of the present application. Figure 13 shows a schematic structural diagram of the camera lens group according to Embodiment 7 of the present application.

[0137] As Figure 13 shown, the camera lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0138] The first lens E1 has a negative optical power, its object side surface S1 is concave, and its image side surface S2 is convex. 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 positive optical power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power, its object side surface S7 is concave, 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 convex. 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 convex, 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.

[0139] In this example, the total effective focal length f of the camera lens group is 3.95 mm, the total length TTL of the camera lens group is 6.70 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the camera lens group is ImgH = 4.60 mm, the aperture value Fno of the camera lens group is 1.78, and the maximum half field of view Semi-FOV of the camera lens group is 52.3°.

[0140] Table 13 shows the basic parameter table of the camera 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 mirrors that can be used in Example 7, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0141]

[0142] Table 13

[0143]

[0144]

[0145] Table 14

[0146] Figure 14A Shows the axial chromatic aberration curve of the camera lens group of Example 7, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 14B Shows the astigmatism curve of the camera 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 camera lens group of Example 7, which represents the distortion magnitude values corresponding to different image heights. Figure 14D Shows the longitudinal chromatic aberration curve of the camera lens group of Example 7, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 14A to 14D It can be known that the camera lens group given in Example 7 can achieve good imaging quality.

[0147] Example 8

[0148] The following refers to Figures 15 to 16D Describes the camera lens group according to Embodiment 8 of the present application. Figure 15 Shows a schematic structural diagram of the camera lens group according to Embodiment 8 of the present application.

[0149] As Figure 15 shown, the camera lens group sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0150] The first lens E1 has a positive optical power, its object side S1 is convex, and its image side S2 is convex. 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 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 concave. The fifth lens E5 has a positive optical power, its object side S9 is concave, and its image side S10 is convex. The sixth lens E6 has a positive optical power, its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a negative optical power, its object side S13 is convex, 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.

[0151] In this example, the total effective focal length f of the camera lens group is 4.00 mm, the total length TTL of the camera lens group is 5.86 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 of the camera lens group is ImgH = 4.30 mm, the aperture value Fno of the camera lens group is 1.92, and the maximum half field of view Semi - FOV of the camera lens group is 35.4°.

[0152] Table 15 shows the basic parameter table of the camera 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 high - order term coefficients of the aspherical mirrors 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.

[0153]

[0154]

[0155] Table 15

[0156] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.4626E-02 6.7816E-03 -1.0313E-02 1.0549E-02 -7.0048E-03 2.7655E-03 -6.3823E-04 7.9488E-05 -4.1107E-06 S2 4.4273E-02 -3.4997E-03 -4.4744E-03 1.6383E-02 -1.8512E-02 1.1588E-02 -4.3458E-03 9.3679E-04 -8.7640E-05 S3 2.0396E-02 1.5642E-03 -2.8406E-02 6.4732E-02 -4.3084E-02 -2.9085E-02 6.6616E-02 -4.0488E-02 8.8538E-03 S4 -2.2285E-02 1.2599E-02 -1.0419E-01 5.0102E-01 -1.3348E+00 2.0922E+00 -1.9074E+00 9.3768E-01 -1.9183E-01 S5 -4.6569E-02 4.2323E-02 -1.8581E-01 4.4321E-01 -6.4584E-01 5.5673E-01 -2.4890E-01 3.0545E-02 9.1528E-03 S6 -1.2346E-01 9.1343E-02 -3.2001E-01 6.8871E-01 -9.4447E-01 8.9855E-01 -5.7633E-01 2.1124E-01 -3.1721E-02 S7 -1.5820E-01 1.2999E-01 -6.0857E-01 1.5328E+00 -2.3599E+00 2.4206E+00 -1.5922E+00 5.9003E-01 -9.1661E-02 S8 -4.8045E-02 8.9979E-02 -2.5008E-01 3.3412E-01 -2.6311E-01 1.3100E-01 -4.1502E-02 7.7543E-03 -6.4539E-04 S9 4.1551E-03 1.2673E-01 -2.3123E-01 2.1616E-01 -1.2284E-01 4.3596E-02 -9.4402E-03 1.1428E-03 -5.9377E-05 S10 -1.6923E-01 3.7096E-02 9.7926E-02 -1.1709E-01 6.7402E-02 -2.2483E-02 4.3777E-03 -4.6224E-04 2.0496E-05 S11 3.5179E-02 -1.3201E-01 1.2564E-01 -9.8375E-02 7.8373E-02 -5.8647E-02 3.3552E-02 -1.3472E-02 3.7252E-03 S12 2.5577E-01 -1.6924E-01 -8.9174E-02 2.6296E-01 -2.5028E-01 1.4294E-01 -5.4883E-02 1.4746E-02 -2.8084E-03 S13 -2.1189E-01 2.9196E-02 -2.0994E-02 4.3608E-02 -3.4453E-02 1.5172E-02 -4.2733E-03 8.1680E-04 -1.0870E-04 S14 -3.4929E-01 1.9392E-01 -1.1766E-01 6.6505E-02 -2.9461E-02 9.4095E-03 -2.1241E-03 3.3951E-04 -3.8509E-05

[0157] Table 16

[0158] Figure 16A shows the axial chromatic aberration curve of the camera 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 camera 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 camera 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 camera 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 toFigures 16A to 16D It can be seen that the camera lens group given in Embodiment 8 can achieve good imaging quality.

[0159] In summary, Embodiments 1 to 8 respectively satisfy the relationships shown in Table 17.

[0160]

[0161]

[0162] Table 17

[0163] 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 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 above-described camera lens group.

[0164] The above description is only a preferred embodiment of the present application and an explanation 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 a focal power, whose image side is convex; a second lens with a positive focal power, whose object side is convex; a diaphragm; a third lens with a focal power, whose image side is convex; a fourth lens with a focal power, whose object side is concave; a fifth lens with a focal power, whose image side is convex; a sixth lens with a positive focal power, whose object side is convex; and a seventh lens with a negative focal power, whose object side is convex and image side is concave; wherein, the first lens has a negative focal power, the third lens has a positive focal power, and the fifth lens has a negative focal power; or, the fourth lens has a negative focal power, the fifth lens has a positive focal power, and the signs of the focal powers of the first lens and the third lens are opposite; at least one of the mirror surfaces from the object side of the first lens to the image side of the seventh lens is an aspherical mirror surface; the number of lenses with focal power in the imaging lens group is seven; and the total effective focal length f of the imaging lens group, the effective focal length f2 of the second lens, and the effective focal length f6 of the sixth lens satisfy: 1.60 < (f / f2) + (f / f6) ≤ 2.12; the combined focal length f56 of the fifth lens and the sixth lens and the distance BFL on the optical axis from the image side of the seventh lens to the imaging surface of the imaging lens group satisfy: 1.70 < f56 / BFL < 4.80; the combined focal length f12 of the first lens and the second lens and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 0.88 ≤ f12 / f56 < 2.

10.

2. The imaging lens group according to claim 1, characterized in that, the radius of curvature R13 of the object side of the seventh lens and the radius of curvature R14 of the image side of the seventh lens satisfy: 3.07 ≤ (R13 + R14) / (R13 - R14) ≤ 4.

24.

3. The imaging lens group according to claim 1, characterized in that, the central thickness CT1 of the first lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis satisfy: 0.70 < CT1 / CT7 < 2.

00.

4. The imaging lens group according to claim 1, characterized in that, the central thickness CT4 of the fourth lens on the optical axis and the spacing distance T45 on the optical axis between the fourth lens and the fifth lens satisfy: 0.80 < CT4 / T45 < 4.

20.

5. The imaging lens group according to claim 1, characterized in that, the distance SAG12 on the optical axis from the intersection of the image side of the first lens and the optical axis to the vertex of the effective radius of the image side of the first lens and the distance SAG21 on the optical axis from the intersection of the object side of the second lens and the optical axis to the vertex of the effective radius of the object side of the second lens satisfy: 1.11 ≤ (SAG21 + SAG12) / (SAG21 - SAG12) ≤ 2.

90.

6. The camera lens group according to claim 1, wherein, the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy: 1.60 < ET4 / ET5 ≤ 3.

21.

7. The camera lens group according to claim 1, wherein, the maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT72 of the image side of the seventh lens satisfy: 2.59 ≤ (DT11 + DT72) / (DT72 - DT11) ≤ 4.

50.

8. The camera lens group according to claim 1, wherein, the total effective focal length f of the camera lens group and the curvature radius R11 of the object side of the sixth lens satisfy: 0.63 ≤ f / R11 ≤ 1.

93.

9. The camera lens group according to claim 1, wherein, the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the camera lens group and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the camera lens group satisfy: 1.36 ≤ TTL / ImgH < 1.

50.

10. The camera lens group according to claim 1, wherein, the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the camera lens group, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the camera lens group, and the total effective focal length f of the camera lens group satisfy: 5.19 mm ≤ TTL / ImgH × f < 5.80 mm.

Images