Imaging lens group

Abstract

The invention discloses an imaging lens group, which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis, a second lens; a third lens; a fourth lens having an effective focal length greater than zero; a fifth lens having an effective focal length less than zero; the effective focal length of the sixth lens is smaller than zero; and a seventh lens having an effective focal length greater than zero; wherein the number of the lenses in the imaging lens group is seven, and the effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the effective focal length f5 of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens meet the following conditions: 1lt; f4 / f5 * (R8 + R9) / (R8-R9) lt; 7.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and in particular to a seven-piece imaging lens assembly. Background Art

[0002] With the rapid development of portable devices such as smartphones, more new requirements have been put forward for the imaging functions of portable devices such as smartphones. For example, the imaging lens group of portable devices such as smartphones can meet the requirements of a large field of view through the optical design of the imaging lens group. However, the traditional imaging lens group has large aberrations while meeting the requirements of a large field of view, which will affect the imaging effect of the imaging lens group. Summary of the invention

[0003] The present application provides an imaging lens assembly that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0004] One aspect of the present application provides an imaging lens group, which includes, in order from the object side to the image side along the optical axis: a first lens, whose effective focal length is less than zero; a second lens; a third lens; a fourth lens, whose effective focal length is greater than zero; a fifth lens, whose effective focal length is less than zero; a sixth lens, whose effective focal length is less than zero; and a seventh lens, whose effective focal length is greater than zero; wherein the number of lenses in the imaging lens group is seven, and the effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the effective focal length f5 of the fifth lens, and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1 <f4 / f5×(R8+R9) / (R8-R9)<7。

[0005] According to an exemplary embodiment of the present application, the effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, the effective focal length f7 of the seventh lens, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 0.3<(f7 / R13×f7 / R14) / (f6 / R11×f6 / R12)<1.7.

[0006] According to an exemplary embodiment of the present application, the curvature radius R12 of the image side surface of the sixth lens, the curvature radius R13 of the object side surface of the seventh lens, the maximum effective semi-aperture DT62 of the image side surface of the sixth lens, and the maximum effective semi-aperture DT71 of the object side surface of the seventh lens satisfy: -2.9 <R12 / R13×DT62 / DT71<-1.9。

[0007] According to an exemplary embodiment of the present application, the maximum effective semi-aperture DT11 of the object side surface of the first lens, the axial distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the effective semi-aperture vertex of the object side surface of the first lens, and the refractive index N1 of the first lens satisfy: 13 <DT11 / SAG11×N1<21。

[0008] According to an exemplary embodiment of the present application, a center thickness CT4 of the fourth lens on the optical axis, an air interval T45 between the fourth lens and the fifth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: 20<(CT4+CT5) / T45<125.

[0009] According to an exemplary embodiment of the present application, a center thickness CT6 of the sixth lens on the optical axis, an air interval T67 between the sixth lens and the seventh lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy: 4<(CT6+CT7) / T67<22.

[0010] According to an exemplary embodiment of the present application, the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens and the total effective focal length f of the imaging lens group satisfy: -1.2 <f1 / f×(f1 / R1+f1 / R2)<-0.3。

[0011] According to an exemplary embodiment of the present application, the combined focal length f45 of the fourth lens and the fifth lens, the total effective focal length f of the imaging lens group, the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens satisfy: 2<|f45| / f×N4 / N5<19.

[0012] According to an exemplary embodiment of the present application, the curvature radius MR of the imaging surface of the imaging lens group, half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens group ImgH, and half of the maximum field of view angle Semi-FOV of the imaging lens group satisfy: 16<|MR| / ImgH×tan(Semi-FOV).

[0013] According to an exemplary embodiment of the present application, the imaging lens group further includes an aperture, and the axial distance SD from the aperture to the image side surface of the seventh lens, the axial distance TD from the object side surface of the first lens to the image side surface of the seventh lens, the entrance pupil diameter EPD of the imaging lens group and the total effective focal length f of the imaging lens group satisfy: 0.2 <SD / TD×EPD / f<0.3。

[0014] According to an exemplary embodiment of the present application, a refractive index N1 of the first lens, a refractive index N2 of the second lens, a refractive index N3 of the third lens, a refractive index N4 of the fourth lens, a refractive index N5 of the fifth lens, a refractive index N6 of the sixth lens, and a refractive index N7 of the seventh lens satisfy: 1.25<(N1+N3+N5+N7) / (N2+N6+N4)<1.35.

[0015] The present application reasonably distributes the effective focal lengths of the lenses in the imaging lens group so that the imaging lens group can meet the characteristics of a large field of view and small aberrations. In addition, the effective focal length of the fourth lens, the radius of curvature of the image side surface of the fourth lens, the effective focal length of the fifth lens and the radius of curvature of the object side surface of the fifth lens are restricted. While ensuring the processability of the fourth lens and the fifth lens, the optical powers of the fourth lens and the fifth lens are reasonably distributed in space, thereby reducing the systematic aberrations of the imaging lens group and improving the image quality of the imaging lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 A schematic structural diagram of an imaging lens assembly according to Embodiment 1 of the present application is shown;

[0018] FIG. 2A to FIG. 2C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group according to Example 1 of the present application are respectively shown;

[0019] Figure 3 A schematic structural diagram of an imaging lens assembly according to Embodiment 2 of the present application is shown;

[0020] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group according to Example 2 of the present application are respectively shown;

[0021] Figure 5 A schematic structural diagram of an imaging lens assembly according to Embodiment 3 of the present application is shown;

[0022] FIG. 6A to FIG. 6C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group according to Example 3 of the present application are respectively shown;

[0023] Figure 7 A schematic structural diagram of an imaging lens assembly according to Embodiment 4 of the present application is shown;

[0024] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group according to Example 4 of the present application are respectively shown;

[0025] Fig. 9 A schematic structural diagram of an imaging lens assembly according to Embodiment 5 of the present application is shown;

[0026] FIG. 10A to FIG. 10C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group according to Example 5 of the present application are respectively shown;

[0027] Fig.11 A schematic structural diagram of an imaging lens assembly according to Embodiment 6 of the present application is shown;

[0028] FIG. 12A to FIG. 12C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group according to Example 6 of the present application are respectively shown;

[0029] Fig.13 shows a schematic structural diagram of an imaging lens group according to Embodiment 7 of the present application; and

[0030] FIG. 14A to FIG. 14C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group according to Example 7 of the present application are respectively shown. DETAILED DESCRIPTION

[0031] In order to better understand the present application, various aspects of the present application are described in detail 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.

[0032] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0033] 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 is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0034] It should also be understood that the terms "include", "comprising", "having", "including" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features.

[0035] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. Terms should be interpreted as having the same meaning as they have in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] The imaging lens group according to the exemplary embodiment of the present application may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, and the seven lenses are arranged in sequence from the object side to the image side along the optical axis. There may be an air gap between adjacent two lenses of the first lens to the seventh lens.

[0038] In example embodiments, the effective focal length of the first lens may be less than zero.

[0039] In example embodiments, the effective focal length of the second lens may be greater than zero.

[0040] In example embodiments, the effective focal length of the third lens may be greater than zero.

[0041] In example embodiments, the effective focal length of the fourth lens may be greater than zero.

[0042] In example embodiments, the effective focal length of the fifth lens may be less than zero.

[0043] In example embodiments, the effective focal length of the sixth lens may be less than zero.

[0044] In example embodiments, the effective focal length of the seventh lens may be greater than zero.

[0045] In example embodiments, the object-side surface of the first lens may be a concave surface, and the image-side surface may be a concave surface.

[0046] In example embodiments, the object-side surface of the second lens may be a convex surface, and the image-side surface may be a concave surface.

[0047] In an exemplary embodiment, the object side surface of the third lens may be convex, and the image side surface may be convex.

[0048] In an exemplary embodiment, the object side surface of the fourth lens may be concave, and the image side surface may be convex.

[0049] In an exemplary embodiment, the object side surface of the fifth lens may be concave, and the image side surface may be concave.

[0050] In an exemplary embodiment, the object side surface of the sixth lens may be concave, and the image side surface may be convex.

[0051] In an exemplary embodiment, the object side surface of the seventh lens may be convex, and the image side surface may be concave.

[0052] In an exemplary embodiment, the effective focal length f4 of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, the effective focal length f5 of the fifth lens, and the radius of curvature R9 of the object side surface of the fifth lens may satisfy: 1 < f4 / f5 × (R8 + R9) / (R8 - R9) < 7. By reasonably allocating the effective focal lengths of the lenses in the imaging lens group, the present application can enable the imaging lens group to have the characteristics of a large field of view and small aberration. Moreover, the mutual relationship between the effective focal length of the fourth lens, the radius of curvature of the image side surface of the fourth lens, the effective focal length of the fifth lens, and the radius of curvature of the object side surface of the fifth lens is restricted, so as to reasonably distribute the optical power of the fourth lens and the fifth lens in space while ensuring the processability of the fourth lens and the fifth lens, thereby reducing the systematic aberration of the imaging lens group and improving the image quality of the imaging lens group.

[0053] In an exemplary embodiment, the effective focal length f6 of the sixth lens, the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens, the effective focal length f7 of the seventh lens, 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: 0.3 < (f7 / R13 × f7 / R14) / (f6 / R11 × f6 / R12) < 1.7. By reasonably controlling the mutual relationship between the effective focal length of the sixth lens, the radii of curvature of the object side surface and the image side surface of the sixth lens, the effective focal length of the seventh lens, and the radii of curvature of the object side surface and the image side surface of the seventh lens, the surface types of the sixth lens and the seventh lens can be constrained, the processability of the sixth lens and the seventh lens can be improved, and the sensitivity and assembly difficulty of the sixth lens and the seventh lens can be reduced.

[0054] In an exemplary embodiment, the radius of curvature R12 of the image side surface of the sixth lens, the radius of curvature R13 of the object side surface of the seventh lens, the maximum effective semi-aperture DT62 of the image side surface of the sixth lens, and the maximum effective semi-aperture DT71 of the object side surface of the seventh lens may satisfy: -2.9 < R12 / R13 × DT62 / DT71 < -1.9. Reasonably controlling the mutual relationship among the radius of curvature of the image side surface of the sixth lens, the radius of curvature of the object side surface of the seventh lens, the maximum effective semi-aperture of the image side surface of the sixth lens, and the maximum effective semi-aperture of the object side surface of the seventh lens can constrain the sizes of the sixth lens and the seventh lens, and improve the processability and assembly stability of the sixth lens and the seventh lens.

[0055] In an exemplary embodiment, the maximum effective semi-aperture DT11 of the object side surface of the first lens, the axial distance SAG11 from the intersection point of the object side surface of the first lens and the optical axis to the vertex of the effective semi-aperture of the object side surface of the first lens, and the refractive index N1 of the first lens may satisfy: 13 < DT11 / SAG11 × N1 < 21. Reasonably controlling the mutual relationship among the maximum effective semi-aperture of the object side surface of the first lens, the axial distance from the intersection point of the object side surface of the first lens and the optical axis to the vertex of the effective semi-aperture of the object side surface of the first lens, and the refractive index of the first lens can constrain the maximum field of view angle of the imaging lens group, improve the processability of the first lens, and reduce the assembly difficulty of the first lens.

[0056] In an exemplary embodiment, the central thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis may satisfy: 20 < (CT4 + CT5) / T45 < 125. Reasonably controlling the mutual relationship among the central thickness of the fourth lens on the optical axis, the air gap between the fourth lens and the fifth lens on the optical axis, and the central thickness of the fifth lens on the optical axis can constrain the sizes of the fourth lens and the fifth lens and ensure an optimal relative position of the fourth lens and the fifth lens in space, thereby improving the processability and assembly stability of the fourth lens and the fifth lens.

[0057] In an exemplary embodiment, the central thickness CT6 of the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the central thickness CT7 of the seventh lens on the optical axis may satisfy: 4 < (CT6 + CT7) / T67 < 22. Reasonably controlling the mutual relationship among the central thickness of the sixth lens on the optical axis, the air gap between the sixth lens and the seventh lens on the optical axis, and the central thickness of the seventh lens on the optical axis can constrain the sizes of the sixth lens and the seventh lens and ensure an optimal relative position of the sixth lens and the seventh lens in space, thereby improving the processability and assembly stability of the sixth lens and the seventh lens.

[0058] In an exemplary embodiment, the effective focal length f1 of the first lens, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the total effective focal length f of the imaging lens group may satisfy: -1.2 < f1 / f × (f1 / R1 + f1 / R2) < -0.3. Reasonably controlling the mutual relationship among the effective focal length of the first lens, the radius of curvature of the object side surface of the first lens, the radius of curvature of the image side surface of the first lens, and the total effective focal length of the imaging lens group can improve the processability of the first lens. At the same time, it is also beneficial to the reasonable spatial distribution of the optical power of the first lens, thereby reducing the systematic aberration of the imaging lens group and improving the image quality of the imaging lens group.

[0059] In an exemplary embodiment, the combined focal length f45 of the fourth lens and the fifth lens, the total effective focal length f of the imaging lens group, the refractive index N4 of the fourth lens, and the refractive index N5 of the fifth lens may satisfy: 2 < |f45| / f × N4 / N5 < 19. Reasonably controlling the mutual relationship among the combined focal length of the fourth lens and the fifth lens, the total effective focal length of the imaging lens group, the refractive index N4 of the fourth lens, and the refractive index of the fifth lens is beneficial to the reasonable spatial distribution of the optical power of the fourth lens and the fifth lens, thereby reducing the systematic aberration of the imaging lens group and improving the image quality of the imaging lens group.

[0060] In an exemplary embodiment, the radius of curvature MR of the imaging surface of the imaging lens group, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the imaging lens group, and half of the maximum field of view angle Semi-FOV of the imaging lens group satisfy: 16 < |MR| / ImgH × tan(Semi-FOV). In the example, 16 < |MR| / ImgH × tan(Semi-FOV) < 50. Reasonably controlling the mutual relationship among the radius of curvature of the imaging surface of the imaging lens group, half of the diagonal length of the effective pixel region on the imaging surface of the imaging lens group, and half of the maximum field of view angle of the imaging lens group can constrain the radius of curvature of the imaging surface while ensuring that the imaging lens group has the characteristics of a large image surface and a large field of view, ensuring the processability of the imaging surface, improving the relative illumination of the imaging lens group, reducing the total optical length of the imaging lens group, and balancing the inner and outer field performance of the imaging lens group.

[0061] In an exemplary embodiment, the imaging lens group may further include a diaphragm, which may be disposed, for example, between the second lens and the third lens. The on-axis distance SD from the diaphragm of the imaging lens group to the image side of the seventh lens, the on-axis distance TD from the object side of the first lens to the image side of the seventh lens, the entrance pupil diameter EPD of the imaging lens group, and the total effective focal length f of the imaging lens group may satisfy: 0.2 < SD / TD × EPD / f < 0.3. By reasonably controlling the interrelationship among the on-axis distance from the diaphragm of the imaging lens group to the image side of the seventh lens, the on-axis distance from the object side of the first lens to the image side of the seventh lens, the entrance pupil diameter of the imaging lens group, and the total effective focal length of the imaging lens group, the optical overall length and the f-number of the imaging lens group can be constrained, and while ensuring that the imaging lens group has a large aperture, miniaturization of the imaging lens group can be achieved to meet the requirements of the overall machine assembly.

[0062] In an exemplary embodiment, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, the refractive index N6 of the sixth lens, and the refractive index N7 of the seventh lens may satisfy: 1.25 < (N1 + N3 + N5 + N7) / (N2 + N6 + N4) < 1.35. By reasonably controlling the interrelationship among the refractive indices of the first lens to the seventh lens, it is beneficial to the reasonable spatial distribution of the optical power of the sixth lens, thereby reducing the systematic aberration of the imaging lens group and improving the image quality of the imaging lens group.

[0063] The imaging lens group according to the above embodiment of the present application may employ multiple lenses, such as the seven lenses described above. By reasonably allocating optical parameters such as the optical power, surface shape, central thickness of each lens, and on-axis spacing between each lens, at least one of miniaturization, large field of view, large image plane, and large aperture of the imaging lens group can be achieved, the systematic aberration of the imaging lens group can be reduced, and the image quality, processability, and assembly stability of the imaging lens group can be improved.

[0064] 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 imaging lens group can be changed to obtain the various results and advantages described in this specification.

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

[0066] Example 1

[0067] The following refers to Figures 1 to 2C Describe the imaging lens group according to Embodiment 1 of the present application.

[0068] As Figure 1As shown, the imaging lens group 100 includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. A stop STO may be disposed between the second lens E2 and the third lens E3.

[0069] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive power, and 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. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0070] Table 1 shows a basic parameter table of the imaging lens group 100 of Example 1, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0071]

[0072] Table 1

[0073] In this embodiment, the total effective focal length f of the imaging lens group is 2.03 mm, the value of half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group ImgH is 4.18 mm, the value of half the maximum field of view angle Semi-FOV of the imaging lens group is 59.00°, and the value of the aperture number Fno of the imaging lens group is 2.27.

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

[0075]

[0076] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A of the aspheric mirror surfaces S1-S14 that can be used in Example 14 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0077]

[0078]

[0079] Table 2

[0080] Figure 2A The axial chromatic aberration curve of the imaging lens assembly 100 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens assembly 100 . Figure 2B The astigmatism curve of the imaging lens assembly 100 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 2C The distortion curve of the imaging lens assembly 100 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 2A to FIG. 2C It can be seen that the imaging lens group 100 can achieve good imaging quality.

[0081] Example 2

[0082] The following reference Figures 3 to 4C An imaging lens group according to Embodiment 2 of the present application is described.

[0083] like Figure 3 As shown, the imaging lens group 200 includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. A stop STO may be disposed between the second lens E2 and the third lens E3.

[0084] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive power, and 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. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0085] Table 3 shows a basic parameter table of the imaging lens group 200 of Example 2, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0086]

[0087] Table 3

[0088] In this embodiment, the total effective focal length f of the imaging lens group is 2.14 mm, the value of half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group ImgH is 4.18 mm, the value of half the maximum field of view angle Semi-FOV of the imaging lens group is 62.58°, and the value of the aperture number Fno of the imaging lens group is 2.40.

[0089] In Example 2, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 4 lists the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 2. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0090]

[0091]

[0092] Table 4

[0093] Figure 4A The axial chromatic aberration curve of the imaging lens assembly 200 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens assembly 200 . Figure 4B The astigmatism curve of the imaging lens group 200 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 4C The distortion curve of the imaging lens assembly 200 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 4A to FIG. 4C It can be seen that the imaging lens group 200 can achieve good imaging quality.

[0094] Example 3

[0095] The following reference Figures 5 to 6C An imaging lens group according to Embodiment 3 of the present application is described.

[0096] like Figure 5 As shown, the imaging lens group 300 includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. A stop STO may be disposed between the second lens E2 and the third lens E3.

[0097] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive power, and 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. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0098] Table 5 shows a basic parameter table of the imaging lens group 300 of Example 3, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0099]

[0100]

[0101] Table 5

[0102] In this embodiment, the total effective focal length f of the imaging lens group is 2.06 mm, the value of half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group ImgH is 4.18 mm, the value of half the maximum field of view angle Semi-FOV of the imaging lens group is 64.06°, and the value of the aperture number Fno of the imaging lens group is 2.30.

[0103] In Example 3, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 6 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 3. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0104]

[0105]

[0106] Table 6

[0107] Fig. 6A The axial chromatic aberration curve of the imaging lens group 300 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens group 300 . Figure 6B The astigmatism curve of the imaging lens group 300 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 6C The distortion curve of the imaging lens assembly 300 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 6A to FIG. 6C It can be seen that the imaging lens group 300 can achieve good imaging quality.

[0108] Example 4

[0109] The following reference Figures 7 to 8C An imaging lens group according to Embodiment 4 of the present application is described.

[0110] like Figure 7As shown, the imaging lens group 400 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. A stop STO may be disposed between the second lens E2 and the third lens E3.

[0111] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive power, and 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. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0112] Table 7 shows a basic parameter table of the imaging lens group 400 of Example 4, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0113]

[0114]

[0115] Table 7

[0116] In this embodiment, the total effective focal length f of the imaging lens group is 2.40 mm, the value of half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group ImgH is 4.18 mm, the value of half the maximum field of view angle Semi-FOV of the imaging lens group is 58.14°, and the value of the aperture number Fno of the imaging lens group is 2.40.

[0117] In Example 4, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 8 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 4. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A24 , A 26 , A 28 and A 30 .

[0118] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.4668E-01 -1.0326E-01 6.2191E-02 -2.9575E-02 1.0723E-02 -2.9181E-03 5.9071E-04 S2 1.3670E-01 4.9627E-02 -5.3386E-01 1.2908E+00 -1.9238E+00 1.9723E+00 -1.4418E+00 S3 1.2770E-02 -1.3515E-02 -7.5174E-02 4.9738E-01 -1.6948E+00 3.9721E+00 -6.6801E+00 S4 8.2182E-02 -6.5490E-01 1.3450E+01 -1.6982E+02 1.4497E+03 -8.6121E+03 3.6320E+04 S5 -2.5916E-03 -6.7486E-01 2.2189E+01 -4.3344E+02 5.4949E+03 -4.7675E+04 2.9155E+05 S6 -2.0454E-01 6.7323E-01 -1.0446E+01 1.0652E+02 -7.0771E+02 3.2300E+03 -1.0404E+04 S7 -1.3814E-01 4.2206E-01 -5.1553E+00 4.3044E+01 -2.3228E+02 8.6410E+02 -2.2760E+03 S8 1.5885E-01 -1.8393E+00 1.0748E+01 -3.6611E+01 7.5957E+01 -8.1001E+01 -2.6584E+01 S9 4.3162E-02 -2.1043E+00 1.1005E+01 -3.2795E+01 5.8030E+01 -4.1147E+01 -7.3839E+01 S10 1.4800E-01 -1.2063E+00 3.8292E+00 -8.9923E+00 1.6627E+01 -2.4237E+01 2.7540E+01 S11 7.9347E-01 -1.7677E+00 3.3399E+00 -5.3601E+00 7.0157E+00 -7.4542E+00 6.4513E+00 S12 1.6064E-01 -2.6241E-01 5.3120E-01 -8.4311E-01 9.3178E-01 -7.3524E-01 4.2315E-01 S13 -3.0888E-01 2.8251E-01 -2.3909E-01 1.5534E-01 -7.3777E-02 2.5415E-02 -6.3753E-03 S14 -1.4410E-01 1.0907E-01 -8.7868E-02 5.3844E-02 -2.3193E-02 7.0317E-03 -1.5236E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 -8.7946E-05 9.4412E-06 -7.0452E-07 3.4016E-08 -8.9732E-10 5.8093E-12 1.7605E-13 S2 7.6246E-01 -2.9209E-01 8.0190E-02 -1.5362E-02 1.9482E-03 -1.4690E-04 4.9834E-06 S3 8.1221E+00 -7.1195E+00 4.4463E+00 -1.9279E+00 5.5137E-01 -9.3507E-02 7.1204E-03 S4 -1.0992E+05 2.3913E+05 -3.7029E+05 3.9794E+05 -2.8189E+05 1.1830E+05 -2.2272E+04 S5 -1.2759E+06 4.0091E+06 -8.9661E+06 1.3920E+07 -1.4254E+07 8.6528E+06 -2.3580E+06 S6 2.3990E+04 -3.9735E+04 4.6869E+04 -3.8411E+04 2.0782E+04 -6.6744E+03 9.6364E+02 S7 4.3007E+03 -5.8455E+03 5.6627E+03 -3.8128E+03 1.6950E+03 -4.4715E+02 5.3006E+01 S8 2.4999E+02 -4.4609E+02 4.5672E+02 -2.9823E+02 1.2304E+02 -2.9347E+01 3.0914E+00 S9 2.6453E+02 -4.0085E+02 3.7469E+02 -2.2848E+02 8.8898E+01 -2.0095E+01 2.0108E+00 S10 -2.4026E+01 1.5806E+01 -7.6596E+00 2.6406E+00 -6.1122E-01 8.5007E-02 -5.3622E-03 S11 -4.5276E+00 2.5293E+00 -1.0876E+00 3.4297E-01 -7.3929E-02 9.6598E-03 -5.7426E-04 S12 -1.7897E-01 5.5447E-02 -1.2410E-02 1.9498E-03 -2.0373E-04 1.2698E-05 -3.5679E-07 S13 1.1686E-03 -1.5615E-04 1.5030E-05 -1.0145E-06 4.5562E-08 -1.2230E-09 1.4848E-11 S14 2.3868E-04 -2.7106E-05 2.2122E-06 -1.2657E-07 4.8225E-09 -1.0996E-10 1.1355E-12

[0119] Table 8

[0120] Fig. 8A The axial chromatic aberration curve of the imaging lens group 400 is shown, which indicates that the focusing point of light rays of different wavelengths deviates after passing through the imaging lens group 400 . Figure 8B The astigmatism curve of the imaging lens group 400 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Figure 8C The distortion curve of the imaging lens assembly 400 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 8A to FIG. 8C It can be seen that the imaging lens group 400 can achieve good imaging quality.

[0121] Example 5

[0122] The following reference Figures 9 to 10C An imaging lens group according to Example 5 of the present application is described.

[0123] like Fig. 9 As shown, the imaging lens group 500 includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. A stop STO may be disposed between the second lens E2 and the third lens E3.

[0124] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive power, and 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. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0125] Table 9 shows a basic parameter table of the imaging lens group 500 of Example 5, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0126]

[0127] Table 9

[0128] In this embodiment, the total effective focal length f of the imaging lens group is 2.12 mm, the value of half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group ImgH is 4.18 mm, the value of half the maximum field of view angle Semi-FOV of the imaging lens group is 55.89°, and the value of the aperture number Fno of the imaging lens group is 2.32.

[0129] In Example 5, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 10 lists the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 5. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0130] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.5617E-01 -1.1588E-01 7.1336E-02 -3.4215E-02 1.2596E-02 -3.5422E-03 7.5899E-04 S2 1.4560E-01 6.3927E-03 -3.9382E-01 9.1411E-01 -1.2497E+00 1.1738E+00 -7.9202E-01 S3 2.1692E-02 -5.5199E-02 -4.2048E-02 8.7515E-01 -3.5481E+00 8.4540E+00 -1.3520E+01 S4 7.9755E-02 -7.9967E-02 -8.5702E-02 2.4557E+01 -3.6131E+02 2.8651E+03 -1.4642E+04 S5 -7.7490E-02 5.3406E+00 -1.9756E+02 4.4210E+03 -6.4992E+04 6.5866E+05 -4.7367E+06 S6 -1.4060E-01 -6.1932E-01 9.9185E+00 -9.7223E+01 6.6911E+02 -3.2905E+03 1.1751E+04 S7 -1.1916E-01 -2.1344E-01 2.1388E+00 -1.2538E+01 5.7476E+01 -1.9971E+02 5.3033E+02 S8 3.1998E-01 -5.2405E+00 4.3485E+01 -2.2812E+02 8.2667E+02 -2.1474E+03 4.0780E+03 S9 1.1436E-01 -4.7492E+00 3.8447E+01 -1.9755E+02 7.1929E+02 -1.9142E+03 3.7820E+03 S10 8.3196E-03 -8.0114E-01 2.8084E+00 -6.8696E+00 1.3259E+01 -2.0146E+01 2.3595E+01 S11 8.0940E-01 -1.6262E+00 2.0523E+00 -2.2644E-01 -5.5479E+00 1.3307E+01 -1.7703E+01 S12 2.2672E-01 -6.2102E-01 1.4344E+00 -2.2728E+00 2.4996E+00 -1.9728E+00 1.1356E+00 S13 -2.7507E-01 1.5621E-01 -7.0213E-02 1.7664E-02 2.6102E-03 -4.5092E-03 2.0171E-03 S14 -3.3699E-02 -6.7452E-02 7.5830E-02 -4.4721E-02 1.7493E-02 -4.8258E-03 9.5765E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.2332E-04 1.5046E-05 -1.3533E-06 8.6904E-08 -3.7646E-09 9.8437E-11 -1.1721E-12 S2 3.8997E-01 -1.4024E-01 3.6415E-02 -6.6426E-03 8.0688E-04 -5.8549E-05 1.9181E-06 S3 1.5155E+01 -1.2074E+01 6.8109E+00 -2.6599E+00 6.8417E-01 -1.0426E-01 7.1305E-03 S4 5.1279E+04 -1.2593E+05 2.1703E+05 -2.5732E+05 1.9995E+05 -9.1652E+04 1.8776E+04 S5 2.4535E+07 -9.1814E+07 2.4590E+08 -4.5943E+08 5.6848E+08 -4.1851E+08 1.3873E+08 S6 -3.0716E+04 5.8633E+04 -8.0638E+04 7.7635E+04 -4.9548E+04 1.8792E+04 -3.1990E+03 S7 -1.0735E+03 1.6238E+03 -1.7777E+03 1.3459E+03 -6.5632E+02 1.8064E+02 -2.0310E+01 S8 -5.7250E+03 5.9575E+03 -4.5566E+03 2.4984E+03 -9.3178E+02 2.1191E+02 -2.2165E+01 S9 -5.5966E+03 6.2024E+03 -5.0837E+03 2.9912E+03 -1.1933E+03 2.8836E+02 -3.1778E+01 S10 -2.0928E+01 1.3834E+01 -6.6794E+00 2.2817E+00 -5.2152E-01 7.1457E-02 -4.4331E-03 S11 1.5642E+01 -9.6206E+00 4.1493E+00 -1.2328E+00 2.4049E-01 -2.7732E-02 1.4322E-03 S12 -4.7855E-01 1.4699E-01 -3.2459E-02 5.0111E-03 -5.1281E-04 3.1218E-05 -8.5466E-07 S13 -5.2539E-04 8.9588E-05 -1.0317E-05 7.9784E-07 -3.9789E-08 1.1581E-09 -1.4963E-11 S14 -1.3733E-04 1.4179E-05 -1.0405E-06 5.2834E-08 -1.7626E-09 3.4728E-11 -3.0606E-13

[0131] Table 10

[0132] Fig. 10A The axial chromatic aberration curve of the imaging lens group 500 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens group 500. Fig. 10B The astigmatism curve of the imaging lens group 500 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 10C The distortion curve of the imaging lens assembly 500 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 10A to FIG. 10C It can be seen that the imaging lens group 500 can achieve good imaging quality.

[0133] Example 6

[0134] The following reference Figures 11 to 12C An imaging lens group according to Example 6 of the present application is described.

[0135] like Fig.11As shown, the imaging lens group 600 includes, from the object side to the image side along the optical axis, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. A stop STO may be disposed between the second lens E2 and the third lens E3.

[0136] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive power, and 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. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0137] Table 11 shows a basic parameter table of the imaging lens group 600 of Example 6, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0138]

[0139] Table 11

[0140] In this embodiment, the total effective focal length f of the imaging lens group is 2.35 mm, the value of half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group ImgH is 4.18 mm, the value of half the maximum field of view angle Semi-FOV of the imaging lens group is 56.18°, and the value of the aperture number Fno of the imaging lens group is 2.36.

[0141] In Example 6, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 12 lists the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 6. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A30 .

[0142]

[0143]

[0144] Table 12

[0145] Fig. 12A The axial chromatic aberration curve of the imaging lens group 600 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the imaging lens group 600. Fig. 12B The astigmatism curve of the imaging lens group 600 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 12C The distortion curve of the imaging lens assembly 600 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 12A to FIG. 12C It can be seen that the imaging lens group 600 can achieve good imaging quality.

[0146] Example 7

[0147] The following reference Figures 13 to 14C An imaging lens group according to Example 7 of the present application is described.

[0148] like Fig.13 As shown, the imaging lens group 700 includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7. A stop STO may be disposed between the second lens E2 and the third lens E3.

[0149] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive power, and 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. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0150] Table 13 shows a basic parameter table of the imaging lens group 700 of Example 7, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0151]

[0152] Table 13

[0153] In this embodiment, the total effective focal length f of the imaging lens group is 2.31 mm, the value of half the diagonal length of the effective pixel area on the imaging plane of the imaging lens group ImgH is 4.75 mm, the value of half the maximum field of view angle Semi-FOV of the imaging lens group is 59.00°, and the value of the aperture number Fno of the imaging lens group is 2.27.

[0154] In Example 7, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 14 lists the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 7. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0155]

[0156]

[0157] Table 14

[0158] Fig.14A The axial chromatic aberration curve of the imaging lens group 700 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens group 700. Fig. 14B The astigmatism curve of the imaging lens group 700 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 14C The distortion curve of the imaging lens assembly 700 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. FIG. 14A to FIG. 14C It can be seen that the imaging lens group 700 can achieve good imaging quality.

[0159] In summary, the conditional expressions in Examples 1 to 7 satisfy the relationship shown in Table 15.

[0160] Conditional / Example 1 2 3 4 5 6 7 f4 / f5×(R8+R9) / (R8-R9) 3.08 1.40 1.65 1.78 5.97 4.86 3.08 (f7 / R13×f7 / R14) / (f6 / R11×f6 / R12) 0.73 1.58 1.14 0.89 0.53 1.39 0.73 R12 / R13×DT62 / DT71 -2.15 -2.28 -1.99 -2.39 -2.42 -2.75 -2.15 DT11 / SAG11×N1 15.36 18.06 17.03 19.97 18.24 13.99 15.33 (CT4+CT5) / T45 40.25 52.82 40.69 26.81 121.26 41.56 40.25 (CT6+CT7) / T67 7.51 20.80 19.62 20.49 8.13 4.70 7.51 f1 / f×(f1 / R1+f1 / R2) -0.59 -0.63 -0.56 -0.87 -1.09 -0.41 -0.59 |f45| / f×N4 / N5 17.34 3.17 3.79 5.17 5.66 8.43 17.34 |MR| / ImgH×tan(Semi-FOV) 19.91 46.18 24.59 19.24 17.66 17.86 19.91 SD / TD×EPD / f 0.27 0.26 0.27 0.25 0.25 0.24 0.27 (N1+N3+N5+N7) / (N2+N6+N4) 1.33 1.30 1.30 1.30 1.32 1.30 1.33

[0161] Table 15

[0162] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a 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 above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An imaging lens assembly, characterized in that: Along the optical axis from the object side to the image side, they include: A first lens having an effective focal length less than zero; Second lens; The third lens; a fourth lens having an effective focal length greater than zero; a fifth lens having an effective focal length less than zero; a sixth lens having an effective focal length less than zero; and a seventh lens having an effective focal length greater than zero; The number of lenses in the imaging lens group is seven, and The effective focal length f4 of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the effective focal length f5 of the fifth lens and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1 <f4 / f5×(R8+R9) / (R8-R9)<7。 2. The imaging lens assembly according to claim 1, characterized in that: The effective focal length f6 of the sixth lens, the curvature radius R11 of the object side surface of the sixth lens, the curvature radius R12 of the image side surface of the sixth lens, the effective focal length f7 of the seventh lens, the curvature radius R13 of the object side surface of the seventh lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 0.3<(f7 / R13×f7 / R14) / (f6 / R11×f6 / R12)<1.

7.

3. The imaging lens assembly according to claim 1, characterized in that: The curvature radius R12 of the image side surface of the sixth lens, the curvature radius R13 of the object side surface of the seventh lens, the maximum effective semi-aperture DT62 of the image side surface of the sixth lens, and the maximum effective semi-aperture DT71 of the object side surface of the seventh lens satisfy: -2.9 <R12 / R13×DT62 / DT71<-1.9。 4. The imaging lens assembly according to claim 1, characterized in that: The maximum effective half-aperture DT11 of the object side surface of the first lens, the axial distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the effective half-aperture vertex of the object side surface of the first lens, and the refractive index N1 of the first lens satisfy: 13 <DT11 / SAG11×N1<21。 5. The imaging lens assembly according to claim 1, characterized in that: A center thickness CT4 of the fourth lens on the optical axis, an air interval T45 between the fourth lens and the fifth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: 20<(CT4+CT5) / T45<125.

6. The imaging lens assembly according to claim 1, characterized in that: A center thickness CT6 of the sixth lens on the optical axis, an air interval T67 between the sixth lens and the seventh lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy: 4<(CT6+CT7) / T67<22.

7. The imaging lens assembly according to any one of claims 1 to 6, characterized in that: The effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens and the total effective focal length f of the imaging lens group satisfy: -1.2 <f1 / f×(f1 / R1+f1 / R2)<-0.3。 8. The imaging lens assembly according to any one of claims 1 to 6, characterized in that: The combined focal length f45 of the fourth lens and the fifth lens, the total effective focal length f of the imaging lens group, the refractive index N4 of the fourth lens and the refractive index N5 of the fifth lens satisfy: 2<|f45| / f×N4 / N5<19.

9. The imaging lens assembly according to any one of claims 1 to 6, characterized in that: The curvature radius MR of the imaging surface of the imaging lens group, half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens group ImgH and half of the maximum field of view Semi-FOV of the imaging lens group satisfy: 16<|MR| / ImgH×tan(Semi-FOV).

10. The imaging lens assembly according to any one of claims 1 to 6, characterized in that: The imaging lens group further includes an aperture, and an axial distance SD from the aperture to the image side surface of the seventh lens, an axial distance TD from the object side surface of the first lens to the image side surface of the seventh lens, an entrance pupil diameter EPD of the imaging lens group and a total effective focal length f of the imaging lens group satisfy: 0.2 <SD / TD×EPD / f<0.3。

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