Imaging lens assembly

Abstract

An imaging lens set is disclosed, which sequentially comprises, along an optical axis from an object side to an image side: a first lens with an effective focal length less than zero; a second lens; a third lens; a fourth lens with an effective focal length greater than zero; a fifth lens with an effective focal length less than zero; a sixth lens with an effective focal length less than zero; and a seventh lens with an effective focal length greater than zero; wherein the number of lenses in the imaging lens set 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 x (R8+R9) / (R8-R9) < 7.

Description

Technical Field

[0001] This application relates to the field of optical devices, specifically to a seven-element imaging lens group. Background Technology

[0002] With the rapid development of portable devices such as smartphones, new demands have been placed on their imaging capabilities. For example, the optical design of imaging lens groups in smartphones and other portable devices needs to meet the requirement of a large field of view. However, traditional imaging lens groups, while meeting the requirement of a large field of view, also have significant aberrations, which can affect the imaging effect. Summary of the Invention

[0003] This 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 this application provides an imaging lens group comprising, sequentially along the optical axis from the object side to the image side: a first lens having an effective focal length less than zero; 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; a sixth lens having an effective focal length less than zero; and a seventh lens having an effective focal length 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 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 satisfy: 1 <f4 / f5×(R8+R9) / (R8-R9)<7。

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

[0006] According to an exemplary embodiment of this application, 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 half-aperture DT62 of the image-side surface of the sixth lens, and the maximum effective half-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 this application, 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 vertex of the effective half-aperture 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 this application, the center thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 20 < (CT4 + CT5) / T45 < 125.

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

[0010] According to an exemplary embodiment of this application, 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 satisfy: -1.2 <f1 / f×(f1 / R1+f1 / R2)<-0.3。

[0011] According to an exemplary embodiment of this application, the combined focal length f45 of the fourth and fifth lenses, 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 this application, the radius of curvature MR of the imaging surface of the imaging lens group, half the diagonal length of the effective pixel area on the imaging surface of the imaging lens group ImgH, and half the maximum field of view Semi-FOV of the imaging lens group satisfy: 16<|MR| / ImgH×tan(Semi-FOV).

[0013] According to an exemplary embodiment of this application, the imaging lens group further includes an aperture stop, wherein the axial distance SD from the aperture stop 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 this application, 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 satisfy: 1.25 < (N1 + N3 + N5 + N7) / (N2 + N6 + N4) < 1.35.

[0015] This application enables the imaging lens group to meet the characteristics of a large field of view and small aberrations by rationally allocating the effective focal lengths of the lenses in the imaging lens group. Furthermore, it restricts the relationship between the effective focal length of the fourth lens, the radius of curvature of the image side of the fourth lens, and the effective focal length and the radius of curvature of the object side of the fifth lens. While ensuring the manufacturability of the fourth and fifth lenses, it also makes the optical power of the fourth and fifth lenses reasonably distributed in space, thereby reducing the systematic aberrations of the imaging lens group and improving the image quality of the imaging lens group. Attached Figure Description

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

[0017] Figure 1 A schematic diagram of the imaging lens group according to Embodiment 1 of this application is shown;

[0018] Figures 2A to 2C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the imaging lens group according to Embodiment 1 of this application are shown respectively.

[0019] Figure 3 A schematic diagram of the imaging lens group according to Embodiment 2 of this application is shown;

[0020] Figures 4A to 4C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the imaging lens group according to Embodiment 2 of this application are shown respectively.

[0021] Figure 5 A schematic diagram of the imaging lens group according to Embodiment 3 of this application is shown;

[0022] Figures 6A to 6C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the imaging lens group according to Embodiment 3 of this application are shown respectively.

[0023] Figure 7 A schematic diagram of the imaging lens group according to Embodiment 4 of this application is shown;

[0024] Figures 8A to 8C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the imaging lens group according to Embodiment 4 of this application are shown respectively.

[0025] Figure 9 A schematic diagram of the imaging lens group according to Embodiment 5 of this application is shown;

[0026] Figures 10A to 10C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the imaging lens group according to Embodiment 5 of this application are shown respectively.

[0027] Figure 11 A schematic diagram of the imaging lens group according to Embodiment 6 of this application is shown;

[0028] Figures 12A to 12C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the imaging lens group according to Embodiment 6 of this application are shown respectively.

[0029] Figure 13 A schematic diagram of the imaging lens assembly according to Embodiment 7 of this application is shown; and

[0030] Figures 14A to 14C The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the imaging lens group according to Embodiment 7 of this application are shown respectively. Detailed Implementation

[0031] To better understand this application, various aspects of this application will be described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of this application and are not intended to limit the scope of this application in any way.

[0032] In the accompanying 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 illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes 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 location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0034] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprises" as 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 used only to distinguish one feature from another and do not imply any limitation on the features.

[0035] Unless otherwise specified, all terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly stated herein.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] An imaging lens group according to an exemplary embodiment of this 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, which are arranged sequentially along the optical axis from the object side to the image side. An air gap may exist between adjacent lenses in the first to seventh lenses.

[0038] In an exemplary embodiment, the effective focal length of the first lens may be less than zero.

[0039] In an exemplary embodiment, the effective focal length of the second lens may be greater than zero.

[0040] In an exemplary embodiment, the effective focal length of the third lens may be greater than zero.

[0041] In an exemplary embodiment, the effective focal length of the fourth lens may be greater than zero.

[0042] In an exemplary embodiment, the effective focal length of the fifth lens may be less than zero.

[0043] In an exemplary embodiment, the effective focal length of the sixth lens may be less than zero.

[0044] In an exemplary embodiment, the effective focal length of the seventh lens may be greater than zero.

[0045] In an exemplary embodiment, the object-side surface of the first lens may be concave, and the image-side surface may be concave.

[0046] In an exemplary embodiment, the object-side surface of the second lens may be convex, and the image-side surface may be concave.

[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. 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 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 shapes 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. By 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, the sizes of the sixth lens and the seventh lens can be constrained, and the processability and assembly stability of the sixth lens and the seventh lens can be improved.

[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 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. By 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 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, the maximum field angle of the imaging lens group can be constrained, the processability of the first lens can be improved, and the assembly difficulty of the first lens can be reduced.

[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. By 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, the sizes of the fourth lens and the fifth lens can be constrained and the fourth lens and the fifth lens can be ensured to have an optimal relative position 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. By 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, the sizes of the sixth lens and the seventh lens can be constrained and the sixth lens and the seventh lens can be ensured to have an optimal relative position 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, and at the same time is 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 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 angle of the imaging lens group can constrain the radius of curvature of the imaging surface while ensuring that the imaging lens group satisfies the characteristics of a large image surface and a large field of view, ensure the processability of the imaging surface, and improve the relative illumination of the imaging lens group, reduce the total optical length of the imaging lens group, and balance the inner and outer field performance of the imaging lens group.

[0061] In an exemplary embodiment, the imaging lens group may further include an aperture, which may be disposed, for example, between the second lens and the third lens. The on-axis distance SD from the aperture 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 mutual relationship among the on-axis distance from the aperture 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 aperture 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 assembly requirements of the entire unit.

[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 mutual relationship 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 accompanying 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, in sequence along the optical axis from the object side to the image side: 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. An aperture stop STO can be positioned between the second lens E2 and the third lens E3.

[0069] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0070] Table 1 shows the basic parameters of the imaging lens group 100 of Embodiment 1, wherein the units of radius of curvature, 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, half the diagonal length of the effective pixel area ImgH on the imaging surface of the imaging lens group is 4.18 mm, half the maximum field of view Semi-FOV of the imaging lens group is 59.00°, and the aperture number Fno of the imaging lens group is 2.27.

[0074] In Embodiment 1, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0075]

[0076] Where x is the distance vector from the vertex of the aspherical surface at 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 i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A14 that can be used for each aspherical mirror S1-S14 in Example 1. 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 on-axis chromatic aberration curve of the imaging lens group 100 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the imaging lens group 100. Figure 2B The astigmatism curves of the imaging lens group 100 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 2C The distortion curves of the imaging lens group 100 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 2A to 2C It can be seen that the imaging lens group 100 can achieve good imaging quality.

[0081] Example 2

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

[0083] like Figure 3 As shown, the imaging lens group 200 includes, in sequence along the optical axis from the object side to the image side: 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. An aperture stop STO can be positioned between the second lens E2 and the third lens E3.

[0084] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0085] Table 3 shows the basic parameters of the imaging lens group 200 of Embodiment 2, wherein the units of radius of curvature, 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, half the diagonal length of the effective pixel area ImgH on the imaging surface of the imaging lens group is 4.18 mm, half the maximum field of view Semi-FOV of the imaging lens group is 62.58°, and the aperture number Fno of the imaging lens group is 2.40.

[0089] In Example 2, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 4 lists the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror S1-S14 in Example 2. 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 4AThe on-axis chromatic aberration curve of the imaging lens group 200 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging lens group 200. Figure 4B The astigmatism curves of the imaging lens group 200 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 4C The distortion curves of the imaging lens group 200 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 4A to 4C It can be seen that the imaging lens group 200 can achieve good imaging quality.

[0094] Example 3

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

[0096] like Figure 5 As shown, the imaging lens group 300 includes, in sequence along the optical axis from the object side to the image side: 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. An aperture stop STO can be positioned between the second lens E2 and the third lens E3.

[0097] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0098] Table 5 shows the basic parameters of the imaging lens group 300 of Embodiment 3, where the units for radius of curvature, 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, half the diagonal length of the effective pixel area ImgH on the imaging surface of the imaging lens group is 4.18 mm, half the maximum field of view Semi-FOV of the imaging lens group is 64.06°, and the aperture number Fno of the imaging lens group is 2.30.

[0103] In Example 3, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 6 lists the higher-order coefficients A4, A6, A8, and A6 that can be used for each of the aspherical mirrors S1-S14 in Example 3. 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] Figure 6A The on-axis chromatic aberration curve of the imaging lens group 300 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the imaging lens group 300. Figure 6B The astigmatism curves of the imaging lens group 300 are shown, which represent the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 6C The distortion curves of the imaging lens group 300 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 6A to 6C It can be seen that the imaging lens group 300 can achieve good imaging quality.

[0108] Example 4

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

[0110] like Figure 7 As shown, the imaging lens group 400 includes, in sequence along the optical axis from the object side to the image side: 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. An aperture stop STO can be positioned between the second lens E2 and the third lens E3.

[0111] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0112] Table 7 shows the basic parameters of the imaging lens group 400 of Embodiment 4, where the units for radius of curvature, 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, half the diagonal length of the effective pixel area ImgH on the imaging surface of the imaging lens group is 4.18 mm, half the maximum field of view Semi-FOV of the imaging lens group is 58.14°, and the aperture number Fno of the imaging lens group is 2.40.

[0117] In Example 4, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 8 lists the higher-order coefficients A4, A6, A8, and A6 that can be used for each of the aspherical mirrors S1-S14 in Example 4. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 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] Figure 8AThe on-axis chromatic aberration curve of the imaging lens group 400 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging lens group 400. Figure 8B The astigmatism curves of the imaging lens group 400 are shown, which represent the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 8C The distortion curves of the imaging lens group 400 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 8A to 8C It can be seen that the imaging lens group 400 can achieve good imaging quality.

[0121] Example 5

[0122] The following is for reference Figures 9 to 10C The imaging lens group according to Embodiment 5 of this application is described.

[0123] like Figure 9 As shown, the imaging lens group 500 includes, in sequence along the optical axis from the object side to the image side: 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. An aperture stop STO can be positioned between the second lens E2 and the third lens E3.

[0124] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0125] Table 9 shows the basic parameters of the imaging lens group 500 of Embodiment 5, where the units for radius of curvature, 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, half the diagonal length of the effective pixel area ImgH on the imaging surface of the imaging lens group is 4.18 mm, half the maximum field of view Semi-FOV of the imaging lens group is 55.89°, and the aperture number Fno of the imaging lens group is 2.32.

[0129] In Example 5, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 10 lists the higher-order coefficients A4, A6, A8, and A6 that can be used for each of the aspherical mirrors S1-S14 in Example 5. 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] Figure 10A The on-axis chromatic aberration curve of the imaging lens group 500 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging lens group 500. Figure 10B The astigmatism curves of the imaging lens group 500 are shown, which represent the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 10C The distortion curves of the imaging lens group 500 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 10A to 10C It can be seen that the imaging lens group 500 can achieve good imaging quality.

[0133] Example 6

[0134] The following is for reference Figures 11 to 12C The imaging lens group according to Embodiment 6 of this application is described.

[0135] like Figure 11 As shown, the imaging lens group 600 includes, in sequence along the optical axis from the object side to the image side: 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. An aperture stop STO can be positioned between the second lens E2 and the third lens E3.

[0136] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0137] Table 11 shows the basic parameters of the imaging lens group 600 of Embodiment 6, where the units for radius of curvature, thickness / distance and focal length are 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, half the diagonal length of the effective pixel area ImgH on the imaging surface of the imaging lens group is 4.18 mm, half the maximum field of view Semi-FOV of the imaging lens group is 56.18°, and the aperture number Fno of the imaging lens group is 2.36.

[0141] In Example 6, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 12 lists the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror S1-S14 in Example 6. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0142]

[0143]

[0144] Table 12

[0145] Figure 12AThe on-axis chromatic aberration curve of the imaging lens group 600 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging lens group 600. Figure 12B The astigmatism curves of the imaging lens group 600 are shown, which represent the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 12C The distortion curves of the imaging lens group 600 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 12A to 12C It can be seen that the imaging lens group 600 can achieve good imaging quality.

[0146] Example 7

[0147] The following is for reference Figures 13 to 14C The imaging lens group according to Embodiment 7 of this application is described.

[0148] like Figure 13 As shown, the imaging lens group 700 includes, in sequence along the optical axis from the object side to the image side: 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. An aperture stop STO can be positioned between the second lens E2 and the third lens E3.

[0149] The first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0150] Table 13 shows the basic parameters of the imaging lens group 700 of Embodiment 7, wherein the units of radius of curvature, 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, half the diagonal length of the effective pixel area on the imaging surface of the imaging lens group (ImgH) is 4.75 mm, half the maximum field of view (Semi-FOV) of the imaging lens group is 59.00°, and the aperture number Fno of the imaging lens group is 2.27.

[0154] In Example 7, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 14 lists the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror S1-S14 in Example 7. 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] Figure 14A The on-axis chromatic aberration curve of the imaging lens group 700 is shown, which represents the deflection of the focal point after light of different wavelengths passes through the imaging lens group 700. Figure 14B The astigmatism curves of the imaging lens group 700 are shown, which represent the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 14C The distortion curves of the imaging lens group 700 are shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 14A to 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 relationships 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 merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An imaging lens group, characterized by, sequentially include, along the optical axis from the object side to the image side: a first lens having an effective focal length less than zero, an object-side surface being concave, and an image-side surface being concave; a second lens having an effective focal length greater than zero, an object-side surface being convex, and an image-side surface being concave; a third lens having an effective focal length greater than zero, an object-side surface being convex, and an image-side surface being convex; a fourth lens having an effective focal length greater than zero, an object-side surface being concave, and an image-side surface being convex; a fifth lens having an effective focal length less than zero, an object-side surface being concave, and an image-side surface being concave; a sixth lens having an effective focal length less than zero, an object-side surface being concave, and an image-side surface being convex; and a seventh lens having an effective focal length greater than zero, an object-side surface being convex, and an image-side surface being concave; wherein the number of lenses in the imaging lens set 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: 1.40 ≤ f4 / f5 × (R8+R9) / (R8-R9) ≤ 5.97, the imaging surface of the imaging lens set is concave, the curvature radius MR of the imaging surface of the imaging lens set, half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens set ImgH, and half of the maximum field angle of the imaging lens set Semi-FOV satisfy: 17.66 ≤ |MR| / ImgH × tan(Semi-FOV) ≤ 46.

18.

2. The imaging lens set 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: 0.53 ≤ (f7 / R13 × f7 / R14) / (f6 / R11 × f6 / R12) ≤ 1.

58.

3. The imaging lens set 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 half aperture DT62 of the image-side surface of the sixth lens, and the maximum effective half aperture DT71 of the object-side surface of the seventh lens satisfy: -2.75 ≤ R12 / R13 × DT62 / DT71 ≤ -1.

99.

4. The imaging lens set according to claim 1, characterized in that, the maximum effective half aperture DT11 of the object-side surface of the first lens, the on-axis 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: 13.99 ≤ DT11 / SAG11 × N1 ≤ 19.

97.

5. The imaging lens set according to claim 1, characterized in that, the central thickness CT4 of the fourth lens on the optical axis, the air separation T45 of the fourth lens and the fifth lens on the optical axis, and the central thickness CT5 of the fifth lens on the optical axis satisfy: 26.81 ≤ (CT4+CT5) / T45 ≤ 121.

26.

6. The imaging lens set according to claim 1, wherein, A central thickness CT6 of the sixth lens on the optical axis, an air separation T67 of the sixth lens and the seventh lens on the optical axis, and a central thickness CT7 of the seventh lens on the optical axis satisfy: 4.70 ≤ (CT6 + CT7) / T67 ≤ 20.

80.

7. The imaging lens set according to any one of claims 1 to 6, characterized in that, An effective focal length f1 of the first lens, a curvature radius R1 of an object side surface of the first lens, a curvature radius R2 of an image side surface of the first lens, and a total effective focal length f of the imaging lens group satisfy: -1.09 ≤ f1 / f × (f1 / R1 + f1 / R2) ≤ -0.

41.

8. The imaging lens set according to any one of claims 1 to 6, characterized in that, A combined focal length f45 of the fourth lens and the fifth lens, a total effective focal length f of the imaging lens group, a refractive index N4 of the fourth lens, and a refractive index N5 of the fifth lens satisfy: 3.17 ≤ |f45| / f × N4 / N5 ≤ 17.

34.

9. The imaging lens set according to any one of claims 1 to 6, characterized in that, The imaging lens group further includes a stop, an on-axis distance SD of the stop to an image side surface of the seventh lens, an on-axis distance TD of an 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.

10. The imaging lens set according to any one of claims 1 to 6, characterized in that, 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: 1.30 ≤ (N1 + N3 + N5 + N7) / (N2 + N6 + N4) < 1.35.

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