Zoom lens set

Abstract

The present invention relates to a zoom lens group, wherein the lens includes, from the object side to the image side along the optical axis, a first lens group including a first lens, a second lens group including an aperture, a second lens with positive focal power, a third lens, a fourth lens with negative focal power, and a fifth lens, and a third lens group including a sixth lens with positive focal power and a seventh lens; the lenses are not attached to each other, and the first lens group is fixed relative to the imaging surface, while the second lens group and the third lens group can move along the optical axis to achieve continuous zooming. By adopting this structure, different lenses are allocated to different lens groups, and the focal power and surface shape of each lens are reasonably allocated, so that the lens can show better imaging effects at different focal lengths, have smaller aberrations, and can balance the high-order aberrations of the system, which is conducive to matching the main light with the image surface. It is suitable for application in portable electronic products and has broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of optical imaging equipment, and in particular relates to a zoom lens group. Background Art

[0002] With the development of society, electronic products such as mobile phones and tablets have become indispensable tools in people's lives. As a part of hardware, optical imaging modules are becoming more and more important to people. Designers have also designed lenses with various characteristics according to people's usage needs. In the past, all lenses were fixed-focus lenses, which had a fixed focal length and could usually only shoot specific subjects, making them very inconvenient to use. Summary of the invention

[0003] The present invention aims to provide a zoom lens group with multiple lens groups, which is easy to use and carry and has the characteristics of good imaging quality.

[0004] One aspect of the present invention provides a zoom lens group, which includes, in order from the object side to the image side along the optical axis of the zoom lens group:

[0005] A first lens group includes a first lens;

[0006] The second lens group includes an aperture, a second lens, a third lens, a fourth lens and a fifth lens, wherein the second lens has positive power and the fourth lens has negative power;

[0007] A third lens group includes a sixth lens and a seventh lens, wherein the sixth lens has positive refractive power;

[0008] Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are not adhered to each other;

[0009] The first lens group is fixed relative to the imaging surface, while the second lens group and the third lens group can move along the optical axis to achieve continuous zooming of the zoom lens group.

[0010] According to one embodiment of the present invention, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -4.5 <f1 / f3<-3.0。

[0011] According to one embodiment of the present invention, the maximum field of view angle FOV of the zoom lens group at different zoom factors is W |Satisfy: 25°<|FOV W |<52°.

[0012] According to one embodiment of the present invention, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.5 <R4 / R3<1.5。

[0013] According to one embodiment of the present invention, the effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens satisfy: 1.0 <f3 / R5<2.0。

[0014] According to one embodiment of the present invention, the total focal length f of the zoom lens group at different zoom factors is W The entrance pupil diameter EPD of the zoom lens group at different zoom factors W Satisfaction: 2.0 <f W / EPD W <4.0.

[0015] According to one embodiment of the present invention, a curvature radius R7 of the object side surface of the fourth lens, a curvature radius R8 of the image side surface of the fourth lens, and an effective focal length f4 of the fourth lens satisfy: -4.5<|R7+R8| / f4<-0.5.

[0016] According to one embodiment of the present invention, the effective focal length f5 of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2.0 <f5 / R10<-1.0。

[0017] According to one embodiment of the present invention, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: 2.0 <R11 / R13<3.0。

[0018] According to one embodiment of the present invention, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -2.0<(f6+f7) / R12<-1.0.

[0019] According to one embodiment of the present invention, the center thickness CT3 of the third lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 1.0 <CT3 / CT2<2.5。

[0020] According to one embodiment of the present invention, the center thickness CT4 of the fourth lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 4.5 <T34 / CT4<6.0。

[0021] According to one embodiment of the present invention, the center thickness CT6 of the sixth lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis satisfy: 4.5 <CT6 / CT7<9.0。

[0022] According to one embodiment of the present invention, the air interval T45 between the fourth lens and the fifth lens on the optical axis and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1.0 <T67 / T45<16.0。

[0023] According to one embodiment of the present invention, the zoom lens group satisfies the following conditional expression: <D1 / D2<6.0;

[0024] Wherein, D1 is the air gap on the optical axis between the surface closest to the image side when the zoom lens group is located at the telephoto end and the aperture; D2 is the air gap on the optical axis between the surface closest to the image side when the zoom lens group is located at the middle end and the surface closest to the object side when the zoom lens group is located at the telephoto end.

[0025] According to one embodiment of the present invention, the total focal length f of the zoom lens group at different zoom factors is W The air spacing between the surface closest to the image side of the third lens group and the filter on the optical axis at different zoom factors satisfies: 2.0 <f W / D3≤66.

[0026] According to one embodiment of the present invention, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2>30.

[0027] Beneficial effects of the present invention:

[0028] The zoom lens group provided by the present invention includes, from the object side to the image side along the optical axis, a first lens group including a first lens, a second lens group including an aperture, a second lens with positive focal power, a third lens, a fourth lens with negative focal power and a fifth lens, and a third lens group including a sixth lens with positive focal power and a seventh lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are not attached to each other; and the first lens group is fixed relative to the imaging surface, while the second lens group and the third lens group can move along the optical axis to achieve continuous zooming of the zoom lens group. By allocating different lenses to different lens groups and reasonably allocating the focal power and surface shape of each lens, the lens can show better imaging effects at different focal lengths, so that the zoom lens group has smaller aberrations on the optical axis, and can balance the high-order aberrations of the system, which is conducive to matching the main light of the system including the zoom lens group with the image surface, thereby achieving good imaging quality. Therefore, the zoom lens group is suitable for application in portable electronic products and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a schematic structural diagram of the zoom lens group in Embodiment 1 of the present invention when it is at the telephoto end;

[0031] Figure 1a to Figure 1d They are shown respectively Figure 1 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0032] Figure 2 is a schematic structural diagram of the zoom lens group in Embodiment 1 of the present invention when it is at the middle end;

[0033] Figure 2a to Figure 2d They are shown respectively Figure 2 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve when the zoom lens group is at the middle end;

[0034] Figure 3 is a schematic structural diagram of the zoom lens assembly in Embodiment 1 of the present invention when it is at the telephoto end;

[0035] Figure 3a to Figure 3d They are shown respectively Figure 3The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0036] Figure 4 is a schematic structural diagram of a zoom lens assembly in Embodiment 2 of the present invention when it is at the telephoto end;

[0037] Figures 4a to 4d They are shown respectively Figure 4 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0038] Figure 5 is a schematic structural diagram of a zoom lens group in Embodiment 2 of the present invention when it is at the middle end;

[0039] Figure 5a to Figure 5d They are shown respectively Figure 5 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve when the zoom lens group is at the middle end;

[0040] Figure 6 is a schematic structural diagram of a zoom lens assembly in Embodiment 2 of the present invention when it is at a telephoto end;

[0041] Figures 6a to 6d They are shown respectively Figure 6 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0042] Figure 7 is a schematic structural diagram of a zoom lens assembly in Embodiment 3 of the present invention at the telephoto end;

[0043] Figures 7a to 7d They are shown respectively Figure 7 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0044] Figure 8 is a schematic structural diagram of a zoom lens group in Embodiment 3 of the present invention when it is at the middle end;

[0045] Figures 8a to 8d They are shown respectively Figure 8 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve when the zoom lens group is at the middle end;

[0046] Fig. 9 is a schematic structural diagram of a zoom lens assembly in Embodiment 3 of the present invention when it is at a telephoto end;

[0047] Figures 9a to 9d They are shown respectively Fig. 9 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0048] Fig.10 is a schematic structural diagram of a zoom lens assembly in Embodiment 4 of the present invention at the telephoto end;

[0049] Figures 10a to 10d They are shown respectively Fig.10 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0050] Fig.11 is a schematic structural diagram of a zoom lens group in Embodiment 4 of the present invention when it is at the middle end;

[0051] Figures 11a to 11d They are shown respectively Fig.11 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve when the zoom lens group is at the middle end;

[0052] Fig.12 is a schematic structural diagram of a zoom lens assembly in Embodiment 4 of the present invention at a telephoto end;

[0053] Figures 12a to 12d They are shown respectively Fig.12 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0054] Fig.13 is a schematic structural diagram of a zoom lens assembly in Embodiment 5 of the present invention at the telephoto end;

[0055] Figures 13a to 13d They are shown respectively Fig.13 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end;

[0056] Fig.14 is a schematic structural diagram of a zoom lens group in Embodiment 5 of the present invention when it is at the middle end;

[0057] Figures 14a to 14d They are shown respectively Fig.14 The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve when the zoom lens group is at the middle end;

[0058] Fig.15 is a schematic structural diagram of a zoom lens assembly in Embodiment 5 of the present invention at a telephoto end;

[0059] Figures 15a to 15d They are shown respectively Fig.15 The on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens group at the telephoto end.

[0060] Reference numerals

[0061] G1 first lens group; E1 first lens; S1 object side surface of the first lens; S2 image side surface of the first lens; G2 second lens group; STO aperture; E2 second lens; S3 object side surface of the second lens; S4 image side surface of the second lens; E3 third lens; S5 object side surface of the third lens; S6 image side surface of the third lens; E4 fourth lens; S7 object side surface of the seventh lens; S8 image side surface of the eighth lens; E5 fifth lens; S9 object side surface of the ninth lens; S10 image side surface of the tenth lens; G3 third lens group; E6 sixth lens; S11 object side surface of the sixth lens; S12 image side surface of the sixth lens; E7 seventh lens; S13 object side surface of the seventh lens; S14 image side surface of the seventh lens; E8 filter; S15 object side surface of the filter; S16 image side surface of the filter; S17 imaging surface. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0063] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0064] It should also be understood that the terms "comprises", "including", "having", "includes" 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0065] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. 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 only examples and are not drawn strictly to scale.

[0066] In the description of the present invention, 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.

[0067] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0068] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0069] Exemplary Embodiments

[0070] The zoom lens group of the exemplary embodiment of the present invention comprises a first lens group G1, a second lens group G2 and a third lens group G3 which are sequentially arranged from the object side to the image side on the optical axis; wherein the first lens group comprises a first lens; the second lens group comprises an aperture stop, a second lens, a third lens, a fourth lens and a fifth lens which are distributed on the optical axis, wherein the second lens has positive power and the fourth lens has negative power; the third lens group comprises a sixth lens and a seventh lens, wherein the sixth lens has positive power;

[0071] Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are not adhered to each other;

[0072] The first lens group is fixed relative to the imaging surface, while the second lens group and the third lens group can move along the optical axis to achieve continuous zooming of the zoom lens group.

[0073] In the present invention, the above grouping method is adopted to divide the above different lenses into three groups. This characteristic of lens distribution enables zooming of the lens while ensuring imaging quality. By distributing different lenses in different lens groups, each lens can exhibit better imaging effects at different focal lengths. At the same time, by reasonably distributing the optical power and surface shape of the lenses in each lens group, the system including this zoom lens group can have smaller aberrations on the axis. And by reasonably distributing the optical power of the second lens and the fourth lens in the second lens group and the optical power of the sixth lens in the third lens group, the high-order aberrations of the system can be balanced, and it is beneficial for the chief ray of the system to match the image plane. By arranging the aperture in front of the second lens in the second lens group, it is beneficial to improve the chromatic aberration of the system including this zoom lens group.

[0074] The zoom lens group in the present invention has continuous different zoom ratios, and different zoom ratios can be divided into three states - when at the telephoto end, when at the middle end, and when at the long focal length end. The three different zoom states respectively include a certain range of zoom ratios to meet different shooting requirements.

[0075] In this exemplary embodiment, the conditional formula satisfied by the effective focal length f1 of the first lens and the effective focal length f3 of the third lens is: -4.5 < f1 / f3 < -3.0. By reasonably controlling the ratio between the effective focal length of the first lens and the effective focal length of the third lens, it can be ensured that the zoom lens group still has good imaging effects at different focal lengths. More specifically, f1 and f3 satisfy: -4.3 < f1 / f3 < -3.03. For example, -4.13 ≤ f1 / f3 ≤ -3.06.

[0076] In this exemplary embodiment, the maximum field of view |FOV W | of the zoom lens group at different zoom ratios satisfies the conditional formula: 25° < |FOV W | < 52°. This conditional formula restricts the visual angle of the optical system, enabling the zoom lens group to still have a good imaging range at a smaller volume and different zoom ratios. More specifically, |FOV W | satisfies: 26.5° < |FOV W | < 51.8°. For example, 28.4° ≤ |FOV W | ≤ 51.7°.

[0077] In this exemplary embodiment, the conditional formula satisfied by the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens is: 0.5 < R4 / R3 < 1.5. By reasonably controlling the ratio range between the radius of curvature of the object side surface of the second lens and the radius of curvature of the image side surface of the second lens, it is beneficial to reduce the sensitivity of the zoom lens group, and at the same time ensure that the second lens has good processability. More specifically, R4 and R3 satisfy: 0.7 < R4 / R3 < 1.3. For example, 0.94 ≤ R4 / R3 ≤ 1.15.

[0078] In this exemplary embodiment, the conditional formula satisfied by the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens is: 1.0 < f3 / R5 < 2.0. By reasonably controlling the ratio of the effective focal length of the third lens to the radius of curvature of the object side surface within a certain range, the deflection angle of the marginal field of view in the third lens can be controlled, effectively reducing the sensitivity of the third lens to the zoom lens group, thereby effectively reducing the sensitivity of the zoom lens group, and further ensuring the performance of the zoom lens group to a certain extent. More specifically, f3 and R5 satisfy: 1.30 < f3 / R5 < 1.95. For example, 1.47 ≤ f3 / R5 ≤ 1.92.

[0079] In this exemplary embodiment, the total focal length f of the zoom lens group at different zoom ratios W and the entrance pupil diameter EPD of the zoom lens group at different zoom ratios W satisfy the conditional formula: 2.0 < f W / EPD W < 4.0. By controlling the ratio of the total focal length of the zoom lens group to the entrance pupil diameter of the zoom lens group within a certain range, the image plane energy density can be effectively increased, and the signal-to-noise ratio of the output signal of the image-side sensor of the imaging device including the zoom lens group can be improved. More specifically, f W and EPD W satisfy: 2.15 < f W / EPD W < 4.2. For example, 2.25 ≤ f W / EPD W ≤ 4.4.

[0080] In the present exemplary embodiment, the conditional expression satisfied by the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, and the effective focal length f4 of the fourth lens is: -4.5 < |R7 + R8| / f4 < -0.5. By controlling the ratio of the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens to the effective focal length f4 of the fourth lens, it is beneficial to make the structure of the fourth lens E4 more reasonable, ensure the processability of the fourth lens, thereby facilitating the improvement of the mass production yield of the zoom lens group and reducing the production cost. More specifically, R7, R8, and f4 satisfy: -4.3 < |R7 + R8| / f4 < -0.6. For example, -4.05 ≤ |R7 + R8| / f4 ≤ -0.72.

[0081] In the present exemplary embodiment, the conditional expression satisfied by the effective focal length f5 of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens is: -2.0 < f5 / R10 < -1.0. By controlling the ratio of the effective focal length of the fifth lens to the radius of curvature of the object side surface of the fifth lens within a certain reasonable range, the deflection angle of the marginal field of view in the fifth lens can be controlled, and the sensitivity of the zoom lens group can be effectively reduced. More specifically, f5 and R10 satisfy: -1.99 < f5 / R10 < -1.01. For example, -1.98 ≤ f5 / R10 ≤ -1.02.

[0082] In the present exemplary embodiment, the conditional expression satisfied by the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R13 of the object side surface of the seventh lens is: 2.0 < R11 / R13 < 3.0. Limiting the ratio of the radius of curvature of the image side surface of the sixth lens to the radius of curvature of the image side surface of the seventh lens within a certain range helps to improve the stability of lens assembly. More specifically, R11 and R13 satisfy: 2.02 < R11 / R13 < 2.8. For example, 2.05 ≤ R11 / R13 ≤ 2.67.

[0083] In the present exemplary embodiment, the conditional expression satisfied by the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the radius of curvature R12 of the image side surface of the sixth lens is: -2.0 < (f6 + f7) / R12 < -1.0. When the ratio among the effective focal length of the sixth lens, the effective focal length of the seventh lens, and the radius of curvature of the image side surface of the sixth lens is controlled within this range, the field curvature and distortion of the zoom lens group can be improved, and at the same time, the processing difficulty of the sixth lens can be controlled. More specifically, f6, f7, and R12 satisfy: -1.9 < (f6 + f7) / R12 < -1.3. For example, -1.78 ≤ (f6 + f7) / R12 ≤ -1.45.

[0084] In the present exemplary embodiment, the conditional formula satisfied by the central thickness CT3 of the third lens on the optical axis and the central thickness CT2 of the second lens on the optical axis is: 1.0 < CT3 / CT2 < 2.5. By controlling the ratio between the central thickness of the second lens and the central thickness of the third lens, the molding characteristics of the second lens and the third lens can be ensured to a certain extent. More specifically, CT3 and CT2 satisfy: 1.22 < CT3 / CT2 < 2.48. For example, 1.42 ≤ CT3 / CT2 ≤ 2.46.

[0085] In the present exemplary embodiment, the conditional formula satisfied by the central thickness CT4 of the fourth lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis is: 4.5 < T34 / CT4 < 6.0. Reasonably distributing the air gaps between the lenses of the zoom lens group can ensure the processing and assembly characteristics, and avoid problems such as interference between the front and rear lenses during the assembly process due to too small a gap. At the same time, it is beneficial to slow down the light deflection, adjust the field curvature of the zoom lens group, reduce the sensitivity, and thus obtain better imaging quality. More specifically, T34 and CT4 satisfy: 4.7 < T34 / CT4 < 5.7. For example, 4.97 ≤ T34 / CT4 ≤ 5.57.

[0086] In the present exemplary embodiment, the conditional formula satisfied by the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis is: 4.5 < CT6 / CT7 < 9.0. By controlling the ratio of the central thickness of the sixth lens and the central thickness of the seventh lens, the molding characteristics of these two lenses can be ensured to a certain extent, so as to further ensure the mass production yield of the zoom lens group and reduce the production cost. More specifically, CT6 and CT7 satisfy: 4.6 < CT6 / CT7 < 8.8. For example, 4.76 ≤ CT6 / CT7 ≤ 8.66.

[0087] In the present exemplary embodiment, the conditional formula satisfied by the air gap T45 between the fourth lens and the fifth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis is: 1.0 < T67 / T45 < 16.0. Reasonably controlling the range of this conditional formula is beneficial to slowing down the light deflection degree, reducing the sensitivity, and at the same time can ensure the imaging quality of the zoom lens group in the macro state. More specifically, T67 and T45 satisfy: 1.2 < T67 / T45 < 15.57. For example, 1.36 ≤ T67 / T45 ≤ 15.54.

[0088] In the present exemplary embodiment, the zoom lens group satisfies the following conditional expression: 0 < D1 / D2 < 6.0; where D1 is the air gap on the optical axis between the surface closest to the image side when the zoom lens group is at the telephoto end and the diaphragm; D2 is the air gap on the optical axis between the surface closest to the image side when the zoom lens group is at the intermediate end and the surface closest to the object side when the zoom lens group is at the long focal length end. By controlling the ratio of D1 to D2, it is beneficial to slow down the degree of light deflection at different focal lengths, and the imaging quality of the zoom lens group at different focal lengths can be ensured. More specifically, D1 and D2 satisfy: 0.7 < D1 / D2 < 5.80. For example, 0.11 ≤ D1 / D2 ≤ 5.67.

[0089] In the present exemplary embodiment, the total focal length f of the zoom lens group at different zoom ratios W and the conditional expression satisfied by the air gap on the optical axis between the surface closest to the image side in the third lens group and the filter at different zoom ratios is: 2.0 < f W / D3 ≤ 66.0. By the total focal length and the air gap on the optical axis between the surface closest to the image side of the third lens group and the filter, it is beneficial to reduce the chromatic aberration of the telephoto lens, making the telephoto lens have a better imaging effect. More specifically, f W and D3 satisfy: 2.20 < f W / D3 < 65.78. For example, 2.48 ≤ f W / D3 ≤ 65.74.

[0090] In the present exemplary embodiment, the conditional expression satisfied by the Abbe number V1 of the first lens and the Abbe number V2 of the second lens is: V1 - V2 > 30. By reasonably controlling the Abbe number of the first lens and the Abbe number of the second lens, the sensitivity of light to the first two lenses can be reduced, making the zoom lens group have a better imaging quality. More specifically, V1 and V2 satisfy: V1 - V2 > 33. For example, V1 - V2 ≥ 35.7.

[0091] In the present exemplary embodiment, the above zoom lens group may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0092] The zoom lens group according to the above embodiment of the present invention can use multiple lenses in combination, such as the above seven lenses. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the spacing on the optical axis between each lens, etc., the zoom lens group can have multiple different focal lengths, be convenient for photographing objects of different subjects, and have good imaging quality, and is suitable for portable electronic products.

[0093] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the third lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens from the first lens to the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens from the first lens to the seventh lens are both aspherical mirror surfaces.

[0094] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the zoom lens group can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses, and the optical imaging lens may also include other numbers of lenses if necessary.

[0095] The following further describes the specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings. In the following embodiments, f1 refers to the effective focal length of the first lens E1, in millimeters (mm); f2 refers to the effective focal length of the second lens E2, in millimeters (mm); f3 refers to the effective focal length of the third lens E3, in millimeters (mm); f4 refers to the effective focal length of the fourth lens E4, in millimeters (mm); f5 refers to the effective focal length of the fifth lens E5, in millimeters (mm); f6 refers to the effective focal length of the sixth lens E6, in millimeters (mm); f7 refers to the effective focal length of the seventh lens E7, in millimeters (mm); TTL refers to the distance from the object side S1 of the first lens E1 to the imaging surface S17 on the optical axis, in millimeters (mm); ImgH refers to half the diagonal length of the effective pixel area on the imaging surface S17, in millimeters (mm); f W Refers to the total focal length of the zoom lens group at different zoom factors; |FOV W | Refers to the maximum field of view of the zoom lens group at different zoom factors, in degrees; HFOV W It refers to half of the maximum field of view of the zoom lens group at different zoom factors, in degrees; EPD WRefers to the entrance pupil diameter of the zoom lens group at different zoom factors; R1 refers to the radius of curvature of the object side of the first lens; R2 refers to the radius of curvature of the image side of the first lens; R3 refers to the radius of curvature of the object side of the second lens; R4 refers to the radius of curvature of the image side of the second lens; R5 refers to the radius of curvature of the object side of the third lens; R6 refers to the radius of curvature of the image side of the third lens; R7 refers to the radius of curvature of the object side of the fourth lens; R8 refers to the radius of curvature of the image side of the fourth lens; R9 refers to the radius of curvature of the object side of the fifth lens; R10 refers to the radius of curvature of the image side of the fifth lens; R11 refers to the radius of curvature of the object side of the sixth lens; R12 refers to the radius of curvature of the image side of the sixth lens; R13 refers to the radius of curvature of the object side of the seventh lens; R14 refers to the radius of curvature of the image side of the seventh lens; CT2 refers to the center thickness of the second lens on the optical axis; CT3 refers to the center thickness of the third lens on the optical axis; CT4 refers to the center thickness of the fourth The center thickness of the lens on the optical axis; CT6 refers to the center thickness of the sixth lens on the optical axis; CT7 refers to the center thickness of the seventh lens on the optical axis; T34 refers to the air interval between the third lens and the fourth lens on the optical axis; T45 refers to the air interval between the fourth lens and the fifth lens on the optical axis; T67 refers to the air interval between the sixth lens and the seventh lens on the optical axis; D1 refers to the air interval between the surface closest to the image side and the aperture on the optical axis when the zoom lens group is at the telephoto end at different zoom magnifications; D2 refers to the air interval between the surface closest to the image side when the zoom lens group is at the middle end and the surface closest to the object side when the zoom lens group is at the telephoto end at different zoom magnifications; D3 refers to the air interval D3 between the surface closest to the image side in the third lens group and the filter on the optical axis at different zoom magnifications; V1 refers to the Abbe number of the first lens; V2 refers to the Abbe number of the second lens. Specific embodiment 1

[0097] like Figures 1 to 3d As shown, schematic diagrams of the structures of the zoom lens group of Example 1 at the telephoto end, the intermediate end and the long focal end are described respectively, as well as the chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves corresponding to each schematic diagram.

[0098] like Figure 1 , Figure 2 and Figure 3As shown, the zoom lens group includes, from the object side to the image side, a first lens group G1, a second lens group G2, a third lens group G3, a filter E8 and an imaging surface S17. The first lens group G1 includes a first lens E1, the second lens group G2 includes a stop STO, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7. The lenses are not attached to each other, and the third lens group moves along the optical axis with the second lens group.

[0099] Meanwhile, in this embodiment, the object side surface S1 of the first lens E1 is concave, and the image side surface S2 is convex; the second lens has positive power, and the object side surface S3 of the second lens E2 is convex, and the image side surface S4 is concave; the object side surface S5 of the third lens E3 is convex, and the image side surface S6 is convex; the fourth lens has negative power, and the object side surface S7 of the fourth lens E4 is concave, and the image side surface S8 is concave; the object side surface S9 of the fifth lens E5 is convex, and the image side surface S10 is convex; the sixth lens has positive power, and the object side surface S11 of the sixth lens E6 is concave, and the image side surface S12 is convex; the object side surface S13 of the seventh lens E7 is concave, and the image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0100] As shown in Table 1, it is a parameter table of each basic structure of the zoom lens group of Example 1, wherein the units of the curvature radius, thickness / distance, and focal length are all millimeters (mm), wherein OBJ represents an object, the effective focal length f1 of the first lens E1 in the zoom lens group in this embodiment is -18.18 mm, the effective focal length f2 of the second lens E2 in the zoom lens group in this embodiment is 34.11 mm, the effective focal length f3 of the third lens E3 in the zoom lens group in this embodiment is 5.33 mm, the effective focal length f4 of the fourth lens E4 in the zoom lens group in this embodiment is -4.06 mm, the effective focal length f5 of the fifth lens E5 in the zoom lens group in this embodiment is 4.18 mm, the effective focal length f6 of the sixth lens E6 in the zoom lens group in this embodiment is 10.79 mm, and the effective focal length f7 of the seventh lens E7 in the zoom lens group in this embodiment is -4.15 mm:

[0101] Face number Surface type Radius of curvature thickness focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless S1 Aspheric -8.1370 0.2000 -18.18 1.55 56.1 3.4763 S2 Aspheric -45.5977 D1 97.8689 STO Spherical endless 0.0300 S3 Aspheric 3.6524 0.4862 34.11 1.67 20.4 0.0076 S4 Aspheric 4.1191 0.1539 0.1248 S5 Aspheric 3.3885 1.1957 5.33 1.55 56.1 0.1932 S6 Aspheric -17.9712 1.0194 68.0661 S7 Aspheric -3.0806 0.2000 -4.06 1.64 19.2 -0.1391 S8 Aspheric 16.9289 0.1104 18.1211 S9 Aspheric 4.7545 0.9396 4.18 1.55 56.1 0.0777 S10 Aspheric -4.0768 D2 -0.2034 S11 Aspheric -8.5520 2.3177 10.79 1.68 19.2 5.4359 S12 Aspheric -4.3732 0.5266 0.8647 S13 Aspheric -3.3318 0.3669 -4.15 1.55 56.1 1.0413 S14 Aspheric 7.3777 D3 -39.7185 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 0.0500 S17 Spherical endless

[0102] Table 1

[0103] In this embodiment, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 11.59 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm.

[0104] As shown in Table 2, it shows the parameters of the zoom lens group in Example 1 at the telephoto end, the intermediate end and the long focal end, wherein the total focal length f of the zoom lens group at different zoom factors is W , the air gap D1 between the surface closest to the image side and the aperture on the optical axis when the zoom lens group is located at the telephoto end at different zoom magnifications, the air gap D2 between the surface closest to the image side and the surface closest to the object side when the zoom lens group is located at the middle end at different zoom magnifications, and the air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis at different zoom magnifications are all in millimeters (mm). The maximum field of view |FOV of the zoom lens group at different zoom magnifications W The unit of | is degree.

[0105]

[0106] Table 2

[0107] The parameter relationship between the lenses in the zoom lens group in this embodiment 1 is shown in the following Table 3:

[0108]

[0109] Table 3

[0110] 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:

[0111]

[0112] 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); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0113] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 4 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S14 in Example 1.

[0114]

[0115]

[0116] Table 4

[0117] Figure 1a Shows Figure 1 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 1b Shows Figure 1 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Figure 1c Shows Figure 1 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field angles; Figure 1d Shows Figure 1 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0118] Figure 2a Shows Figure 2 The axial chromatic aberration curve when the zoom lens group is at the middle end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 2b Shows Figure 2 The astigmatism curve when the zoom lens group is at the middle end, which represents the meridional image plane curvature and sagittal image plane curvature; Figure 2c Shows Figure 2 The distortion curve of the zoom lens group in the middle end, which indicates the distortion value corresponding to different field of view angles; Figure 2d Shows Figure 2 The magnification chromatic aberration curve when the zoom lens group is at the middle end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0119] Figure 3a Shows Figure 3 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 3b Shows Figure 3 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Figure 3c Shows Figure 3 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field of view angles; Figure 3d Shows Figure 3 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0120] according to Figures 1a to 3d It can be seen from the figure that the zoom lens group provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0122] like Figures 4 to 6d As shown, schematic diagrams of the structures of the zoom lens group of Example 2 at the telephoto end, the intermediate end and the long focal end are described respectively, as well as the chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves corresponding to each schematic diagram.

[0123] like Figure 4 , Figure 5 and Figure 6 As shown, the zoom lens group includes, from the object side to the image side, a first lens group G1, a second lens group G2, a third lens group G3, a filter E8 and an imaging surface S17. The first lens group G1 includes a first lens E1, the second lens group G2 includes a stop STO, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7. The lenses are not attached to each other, and the third lens group moves along the optical axis with the second lens group.

[0124] Meanwhile, in this embodiment, the object side surface S1 of the first lens E1 is concave, and the image side surface S2 is concave; the second lens has positive power, and the object side surface S3 of the second lens E2 is convex, and the image side surface S4 is concave; the object side surface S5 of the third lens E3 is convex, and the image side surface S6 is concave; the fourth lens has negative power, and the object side surface S7 of the fourth lens E4 is concave, and the image side surface S8 is convex; the object side surface S9 of the fifth lens E5 is concave, and the image side surface S10 is convex; the sixth lens has positive power, and the object side surface S11 of the sixth lens E6 is concave, and the image side surface S12 is convex; the object side surface S13 of the seventh lens E7 is concave, and the image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0125] As shown in Table 5, it is a parameter table of each basic structure of the zoom lens group of Example 2, wherein the units of the curvature radius, thickness / distance, and focal length are all millimeters (mm), wherein OBJ represents an object, the effective focal length f1 of the first lens E1 in the zoom lens group in this embodiment is -18.84 mm, the effective focal length f2 of the second lens E2 in the zoom lens group in this embodiment is 97.90 mm, the effective focal length f3 of the third lens E3 in the zoom lens group in this embodiment is 4.85 mm, the effective focal length f4 of the fourth lens E4 in the zoom lens group in this embodiment is -5.41 mm, the effective focal length f5 of the fifth lens E5 in the zoom lens group in this embodiment is 4.93 mm, the effective focal length f6 of the sixth lens E6 in the zoom lens group in this embodiment is 14.13 mm, and the effective focal length f7 of the seventh lens E7 in the zoom lens group in this embodiment is -4.79 mm:

[0126] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless S1 Aspheric -24.0837 0.2000 -18.84 1.55 56.1 -24.9468 S2 Aspheric 17.9983 D1 -34.6198 STO Spherical endless 0.0300 S3 Aspheric 3.4125 0.7921 97.90 1.67 20.4 0.0686 S4 Aspheric 3.2662 0.0300 0.1045 S5 Aspheric 2.5518 1.1574 4.85 1.55 56.1 0.1529 S6 Aspheric 60.0000 0.9950 99.0000 S7 Aspheric -2.2244 0.2000 -5.41 1.64 19.2 0.1880 S8 Aspheric -6.4273 0.0635 8.3057 S9 Aspheric -30.0000 0.7519 4.93 1.55 56.1 99.0000 S10 Aspheric -2.4898 D2 -0.0689 S11 Aspheric -9.0783 2.8437 14.13 1.68 19.2 7.4569 S12 Aspheric -5.2487 0.6430 1.5873 S13 Aspheric -3.9884 0.3282 -4.79 1.55 56.1 1.6061 S14 Aspheric 7.7913 D3 -33.2579 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 0.0500 S17 Spherical endless

[0127] Table 5

[0128] In this embodiment, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 10.54 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm.

[0129] As shown in Table 6, it shows the parameters of the zoom lens group in Example 2 at the telephoto end, the intermediate end and the long focal end, wherein the total focal length f of the zoom lens group at different zoom factors is W , the air gap D1 between the surface closest to the image side and the aperture on the optical axis when the zoom lens group is located at the telephoto end at different zoom magnifications, the air gap D2 between the surface closest to the image side and the surface closest to the object side when the zoom lens group is located at the middle end at different zoom magnifications, and the air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis at different zoom magnifications are all in millimeters (mm). The maximum field of view |FOV of the zoom lens group at different zoom magnifications W The unit of | is degree.

[0130]

[0131] Table 6

[0132] The parameter relationship between the lenses in the zoom lens group in this embodiment 2 is shown in the following Table 7:

[0133]

[0134] Table 7

[0135] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 8 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical mirror surfaces S1-S14 that can be used in Example 2.

[0136]

[0137]

[0138] Table 8

[0139] Figure 4a Shows Figure 4 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 4b Shows Figure 4 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Figure 4c Shows Figure 4 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field angles; Figure 4d Shows Figure 4 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0140] Figure 5a Shows Figure 5 The axial chromatic aberration curve when the zoom lens group is at the middle end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 5b Shows Figure 5 The astigmatism curve when the zoom lens group is at the middle end, which represents the meridional image plane curvature and sagittal image plane curvature; Figure 5c Shows Figure 5 The distortion curve of the zoom lens group in the middle end, which indicates the distortion value corresponding to different field of view angles; Figure 5d Shows Figure 5 The magnification chromatic aberration curve when the zoom lens group is at the middle end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0141] Figure 6a Shows Figure 6 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 6b Shows Figure 6 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Figure 6c Shows Figure 6 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field of view angles; Figure 6d Shows Figure 6 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0142] according to Figures 4a to 6d As shown, the zoom lens set provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0144] like Figures 7 to 9d As shown, schematic diagrams of the structures of the zoom lens group of Example 3 at the telephoto end, the intermediate end and the long focal end are described respectively, as well as the chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves corresponding to each schematic diagram.

[0145] like Figure 7 , Figure 8 and Fig. 9 As shown, the zoom lens group includes, from the object side to the image side, a first lens group G1, a second lens group G2, a third lens group G3, a filter E8 and an imaging surface S17. The first lens group G1 includes a first lens E1, the second lens group G2 includes a stop STO, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7. The lenses are not attached to each other, and the third lens group moves along the optical axis with the second lens group.

[0146] Meanwhile, in this embodiment, the object side surface S1 of the first lens E1 is concave, and the image side surface S2 is concave; the second lens has positive power, and the object side surface S3 of the second lens E2 is convex, and the image side surface S4 is concave; the object side surface S5 of the third lens E3 is convex, and the image side surface S6 is concave; the fourth lens has negative power, and the object side surface S7 of the fourth lens E4 is concave, and the image side surface S8 is concave; the object side surface S9 of the fifth lens E5 is convex, and the image side surface S10 is convex; the sixth lens has positive power, and the object side surface S11 of the sixth lens E6 is concave, and the image side surface S12 is convex; the object side surface S13 of the seventh lens E7 is concave, and the image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0147] As shown in Table 9, it is a parameter table of each basic structure of the zoom lens group of Example 3, wherein the units of the curvature radius, thickness / distance, and focal length are all millimeters (mm), wherein OBJ represents object, the effective focal length f1 of the first lens E1 in the zoom lens group in this embodiment is -18.20 mm, the effective focal length f2 of the second lens E2 in the zoom lens group in this embodiment is 29.00 mm, the effective focal length f3 of the third lens E3 in the zoom lens group in this embodiment is 5.94 mm, the effective focal length f4 of the fourth lens E4 in the zoom lens group in this embodiment is -4.17 mm, the effective focal length f5 of the fifth lens E5 in the zoom lens group in this embodiment is 3.96 mm, the effective focal length f6 of the sixth lens E6 in the zoom lens group in this embodiment is 11.47 mm, and the effective focal length f7 of the seventh lens E7 in the zoom lens group in this embodiment is -4.29 mm:

[0148] Table 9

[0149] In the embodiment, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 11.61 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm.

[0150] As shown in Table 10, it shows the parameters of the zoom lens group in Example 3 at the telephoto end, the intermediate end and the long focal end, wherein the total focal length f of the zoom lens group at different zoom factors is W , the air gap D1 between the surface closest to the image side and the aperture on the optical axis when the zoom lens group is located at the telephoto end at different zoom magnifications, the air gap D2 between the surface closest to the image side and the surface closest to the object side when the zoom lens group is located at the middle end at different zoom magnifications, and the air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis at different zoom magnifications are all in millimeters (mm). The maximum field of view |FOV of the zoom lens group at different zoom magnifications W The unit of | is degree.

[0151]

[0152] Table 10

[0153] The parameter relationship between the lenses in the zoom lens group in this embodiment 3 is shown in the following Table 11:

[0154]

[0155] Table 11

[0156] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 12 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S14 in Example 3.

[0157]

[0158]

[0159] Table 12

[0160] Figure 7a Shows Figure 7 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 7b Shows Figure 7 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Figure 7c Shows Figure 7 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field angles; Figure 7d Shows Figure 7 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0161] Figure 8a Shows Figure 8 The axial chromatic aberration curve when the zoom lens group is at the middle end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 8b Shows Figure 8 The astigmatism curve when the zoom lens group is at the middle end, which represents the meridional image plane curvature and sagittal image plane curvature; Figure 8c Shows Figure 8 The distortion curve of the zoom lens group in the middle end, which indicates the distortion value corresponding to different field of view angles; Figure 8d Shows Figure 8 The magnification chromatic aberration curve when the zoom lens group is at the middle end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0162] Figure 9a Shows Fig. 9 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 9b Shows Fig. 9 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Fig.9c Shows Fig. 9 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field of view angles; Figure 9d Shows Fig. 9 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0163] according to Figures 7a to 9d As shown, the zoom lens group provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0165] like Figures 10 to 12d As shown, schematic diagrams of the structures of the zoom lens group of Example 4 at the telephoto end, the intermediate end and the long focal end are described respectively, as well as the chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves corresponding to each schematic diagram.

[0166] like Fig.10 , Fig.11 and Fig.12 As shown, the zoom lens group includes, from the object side to the image side, a first lens group G1, a second lens group G2, a third lens group G3, a filter E8 and an imaging surface S17. The first lens group G1 includes a first lens E1, the second lens group G2 includes a stop STO, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7. The lenses are not attached to each other, and the third lens group moves along the optical axis with the second lens group.

[0167] Meanwhile, in this embodiment, the object side surface S1 of the first lens E1 is concave, and the image side surface S2 is convex; the second lens has positive power, and the object side surface S3 of the second lens E2 is convex, and the image side surface S4 is concave; the object side surface S5 of the third lens E3 is convex, and the image side surface S6 is convex; the fourth lens has negative power, and the object side surface S7 of the fourth lens E4 is concave, and the image side surface S8 is concave; the object side surface S9 of the fifth lens E5 is convex, and the image side surface S10 is convex; the sixth lens has positive power, and the object side surface S11 of the sixth lens E6 is concave, and the image side surface S12 is convex; the object side surface S13 of the seventh lens E7 is concave, and the image side surface S14 is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0168] As shown in Table 13, it is a parameter table of each basic structure of the zoom lens group of Example 4, wherein the units of the curvature radius, thickness / distance, and focal length are all millimeters (mm), wherein OBJ represents an object, the effective focal length f1 of the first lens E1 in the zoom lens group in this embodiment is -17.90 mm, the effective focal length f2 of the second lens E2 in the zoom lens group in this embodiment is 37.89 mm, the effective focal length f3 of the third lens E3 in the zoom lens group in this embodiment is 5.15 mm, the effective focal length f4 of the fourth lens E4 in the zoom lens group in this embodiment is -3.81 mm, the effective focal length f5 of the fifth lens E5 in the zoom lens group in this embodiment is 4.04 mm, the effective focal length f6 of the sixth lens E6 in the zoom lens group in this embodiment is 12.23 mm, and the effective focal length f7 of the seventh lens E7 in the zoom lens group in this embodiment is -5.46 mm:

[0169]

[0170] Table 13

[0171] In this embodiment, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 is 12.50 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm.

[0172] As shown in Table 14, it shows the parameters of the zoom lens group in Example 4 at the telephoto end, the intermediate end and the long focal end, wherein the total focal length f of the zoom lens group at different zoom factors is W , the air gap D1 between the surface closest to the image side and the aperture on the optical axis when the zoom lens group is located at the telephoto end at different zoom magnifications, the air gap D2 between the surface closest to the image side and the surface closest to the object side when the zoom lens group is located at the middle end at different zoom magnifications, and the air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis at different zoom magnifications are all in millimeters (mm). The maximum field of view |FOV of the zoom lens group at different zoom magnifications W The unit of | is degree.

[0173]

[0174] Table 14

[0175] The parameter relationship between the lenses in the zoom lens group in this embodiment 4 is shown in the following Table 15:

[0176]

[0177] Table 15

[0178] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 16 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of the aspherical mirror surfaces S1 to S14 that can be used in Example 4.

[0179]

[0180]

[0181] Table 16

[0182] Fig.10a Shows Fig.10 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Fig.10b Shows Fig.10 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Fig.10c Shows Fig.10 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field angles; Fig.10d Shows Fig.10 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0183] Fig.11a Shows Fig.11 The axial chromatic aberration curve when the zoom lens group is at the middle end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Fig.11b Shows Fig.11 The astigmatism curve when the zoom lens group is at the middle end, which represents the meridional image plane curvature and sagittal image plane curvature; Fig.11c Shows Fig.11 The distortion curve of the zoom lens group in the middle end, which indicates the distortion value corresponding to different field of view angles; Fig.11d Shows Fig.11 The magnification chromatic aberration curve when the zoom lens group is at the middle end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0184] Fig.12a Shows Fig.12 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Figure 12b Shows Fig.12 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Fig.12c Shows Fig.12 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field of view angles; Fig.12d Shows Fig.12 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0185] according to Figures 10a to 12d As shown, the zoom lens group provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0187] like Figure 13 to Figure 15d As shown, schematic diagrams of the structures of the zoom lens group of Example 5 at the telephoto end, the intermediate end and the long focal end are described respectively, as well as the chromatic aberration curves, astigmatism curves, distortion curves and magnification chromatic aberration curves corresponding to each schematic diagram.

[0188] like Fig.13 , Fig.14 and Fig.15 As shown, the zoom lens group includes, from the object side to the image side, a first lens group G1, a second lens group G2, a third lens group G3, a filter E8 and an imaging surface S17. The first lens group G1 includes a first lens E1, the second lens group G2 includes a stop STO, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7. The lenses are not attached to each other, and the third lens group moves along the optical axis with the second lens group.

[0189] Meanwhile, in this embodiment, the object side surface S1 of the first lens E1 is concave, and the image side surface S2 is concave; the second lens has positive power, and the object side surface S3 of the second lens E2 is convex, and the image side surface S4 is concave; the object side surface S5 of the third lens E3 is convex, and the image side surface S6 is convex; the fourth lens has negative power, and the object side surface S7 of the fourth lens E4 is concave, and the image side surface S8 is concave; the object side surface S9 of the fifth lens E5 is convex, and the image side surface S10 is convex; the sixth lens has positive power, and the object side surface S11 of the sixth lens E6 is concave, and the image side surface S12 is convex; the object side surface S13 of the seventh lens E7 is concave, and the image side surface S14 is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0190] As shown in Table 17, it is a parameter table of basic structures of the zoom lens group of Example 5, wherein the units of the curvature radius, thickness / distance, and focal length are all millimeters (mm), wherein OBJ represents an object, the effective focal length f1 of the first lens E1 in the zoom lens group in this embodiment is -15.93 mm, the effective focal length f2 of the second lens E2 in the zoom lens group in this embodiment is 156.25 mm, the effective focal length f3 of the third lens E3 in the zoom lens group in this embodiment is 3.85 mm, the effective focal length f4 of the fourth lens E4 in the zoom lens group in this embodiment is -2.90 mm, the effective focal length f5 of the fifth lens E5 in the zoom lens group in this embodiment is 3.74 mm, the effective focal length f6 of the sixth lens E6 in the zoom lens group in this embodiment is 9.35 mm, and the effective focal length f7 of the seventh lens E7 in the zoom lens group in this embodiment is -4.81 mm:

[0191] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless S1 Aspheric -14.2672 0.2000 -15.93 1.55 56.1 3.9072 S2 Aspheric 22.3788 D1 -29.1355 STO Spherical endless 0.0300 S3 Aspheric 3.4189 0.7668 156.25 1.67 20.4 -0.0635 S4 Aspheric 3.2176 0.0300 0.1535 S5 Aspheric 2.6137 1.0907 3.85 1.55 56.1 0.1619 S6 Aspheric -9.1895 1.1133 -84.5254 S7 Aspheric -2.9760 0.2000 -2.90 1.64 19.2 -0.5334 S8 Aspheric 5.0540 0.3167 -2.0295 S9 Aspheric 5.5284 1.1584 3.74 1.55 56.1 -1.1188 S10 Aspheric -3.0022 D2 -0.5644 S11 Aspheric -5.2494 1.1424 9.35 1.68 19.2 2.0350 S12 Aspheric -3.1235 0.4296 0.1626 S13 Aspheric -2.5581 0.2000 -4.81 1.55 56.1 0.3361 S14 Aspheric -99.0081 D3 -94.5023 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 0.0500 S17 Spherical endless

[0192] Table 17

[0193] The distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S17 on the optical axis is 14.87 mm, and the half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm.

[0194] As shown in Table 18, it shows the parameters of the zoom lens group in Example 5 at the telephoto end, the intermediate end and the long focal end, wherein the total focal length f of the zoom lens group at different zoom factors is W , the air gap D1 between the surface closest to the image side and the aperture on the optical axis when the zoom lens group is located at the telephoto end at different zoom magnifications, the air gap D2 between the surface closest to the image side and the surface closest to the object side when the zoom lens group is located at the middle end at different zoom magnifications, and the air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis at different zoom magnifications are all in millimeters (mm). The maximum field of view |FOV of the zoom lens group at different zoom magnifications W The unit of | is degree.

[0195]

[0196] Table 18

[0197] The parameter relationship between the lenses in the zoom lens group in this embodiment 5 is shown in the following Table 19:

[0198]

[0199] Table 19

[0200] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 20 shows high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface S1-S14 in Example 5.

[0201]

[0202]

[0203] Table 20

[0204] Fig.13a Shows Fig.13 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Fig.13b Shows Fig.13 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Fig.13c Shows Fig.13 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field angles; Fig.13d Shows Fig.13 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0205] Fig.14a Shows Fig.14 The axial chromatic aberration curve when the zoom lens group is at the middle end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Fig.14b Shows Fig.14 The astigmatism curve when the zoom lens group is at the middle end, which represents the meridional image plane curvature and sagittal image plane curvature; Fig.14c Shows Fig.14 The distortion curve of the zoom lens group in the middle end, which indicates the distortion value corresponding to different field of view angles; Fig.14d Shows Fig.14 The magnification chromatic aberration curve when the zoom lens group is at the middle end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0206] Fig.15a Shows Fig.15 The axial chromatic aberration curve of the zoom lens group at the telephoto end, which indicates the deviation of the focal point of light of different wavelengths after passing through the zoom lens group; Fig.15b Shows Fig.15 The astigmatism curve of the zoom lens group at the telephoto end, which represents the meridional image curvature and sagittal image curvature; Fig.15c Shows Fig.15 The distortion curve of the zoom lens group at the telephoto end, which indicates the distortion value corresponding to different field of view angles; Fig.15d Shows Fig.15 The magnification chromatic aberration curve of the zoom lens group at the telephoto end, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0207] according to Figures 13a to 15d As shown, the zoom lens group provided in Example 5 can achieve good imaging quality.

[0208] The zoom lens group provided by the present invention includes, from the object side to the image side along the optical axis, a first lens group including a first lens, a second lens group including an aperture, a second lens with positive focal power, a third lens, a fourth lens with negative focal power and a fifth lens, and a third lens group including a sixth lens with positive focal power and a seventh lens; the lenses are not attached to each other, and the first lens group, the second lens group and the third lens group move on the optical axis respectively to achieve continuous zooming of the zoom lens group. By allocating different lenses to different lens groups and reasonably allocating the focal power and surface shape of each lens, the lens can show better imaging effects at different focal lengths, so that the zoom lens group has smaller aberrations on the optical axis, and can balance the high-order aberrations of the system, which is conducive to matching the main light of the system including the zoom lens group with the image plane, thereby achieving good imaging quality. Therefore, the zoom lens group is suitable for use in portable electronic products and has broad application prospects.

[0209] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zoom lens assembly, characterized in that: The zoom lens group has three lens groups, and the three lens groups include, in sequence from the object side to the image side along the optical axis of the zoom lens group: A first lens group, consisting of a first lens; A first lens having negative optical power, whose object side surface is concave; The second lens group is composed of a stop, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side to the image side along the optical axis of the zoom lens group; The second lens has positive refractive power, its object side surface is convex and its image side surface is concave; The third lens has positive power and its object side surface is convex; a fourth lens element having negative optical power and a concave object side surface; a fifth lens element having positive refractive power and a convex image-side surface; A third lens group is composed of a sixth lens and a seventh lens arranged in sequence from the object side to the image side along the optical axis of the zoom lens group; a sixth lens having positive refractive power, whose object side surface is concave and image side surface is convex; A seventh lens element having negative optical power, whose object side surface is concave; Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are not adhered to each other; The first lens group is fixed relative to the imaging surface, while the second lens group and the third lens group can move along the optical axis to achieve continuous zooming of the zoom lens group; The effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: -4.13≤f1 / f3≤-3.

06.

2. The zoom lens assembly according to claim 1, wherein: The maximum field of view angle |FOV of the zoom lens group at different zoom factors W |Satisfy: 29.2°≤|FOV W |≤51.7°.

3. The zoom lens assembly according to claim 1, wherein: The curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.94≤R4 / R3≤1.

15.

4. The zoom lens assembly according to claim 1, wherein: The effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens satisfy: 1.47≤f3 / R5≤1.

92.

5. The zoom lens assembly according to claim 1, wherein: The total focal length f of the zoom lens group at different zoom factors W The entrance pupil diameter EPD of the zoom lens group at different zoom factors W Satisfies: 2.25≤f W / EPD W ≤4.

4.

6. The zoom lens assembly according to claim 1, wherein: The curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens and the effective focal length f4 of the fourth lens satisfy: -4.05≤|R7+R8| / f4≤-0.

72.

7. The zoom lens assembly according to claim 1, wherein: The effective focal length f5 of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: -2.0 <f5 / R10<-1.0。 8. The zoom lens assembly according to claim 1, wherein: A curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R13 of the object-side surface of the seventh lens satisfy: 2.05≤R11 / R13≤2.

67.

9. The zoom lens assembly according to claim 1, wherein: The effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -1.78≤(f6+f7) / R12≤-1.

45.

10. The zoom lens assembly according to claim 1, wherein: The center thickness CT3 of the third lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 1.42≤CT3 / CT2<2.

5.

11. The zoom lens assembly according to claim 1, wherein: The center thickness CT4 of the fourth lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 4.97≤T34 / CT4≤5.

57.

12. The zoom lens assembly according to claim 1, wherein: The center thickness CT6 of the sixth lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis satisfy: 4.76≤CT6 / CT7≤8.

66.

13. The zoom lens assembly according to claim 1, wherein: An air interval T45 between the fourth lens and the fifth lens on the optical axis and an air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy the following: 1.36≤T67 / T45≤15.

54.

14. The zoom lens assembly according to claim 1, wherein: The zoom lens group satisfies the following conditional expression: 0.11≤D1 / D2≤3.24; Wherein, D1 is the air gap on the optical axis between the surface closest to the image side when the zoom lens group is located at the telephoto end and the aperture; D2 is the air gap on the optical axis between the surface closest to the image side when the zoom lens group is located at the middle end and the surface closest to the object side when the zoom lens group is located at the telephoto end.

15. The zoom lens assembly according to claim 1, wherein: The total focal length f of the zoom lens group at different zoom factors W The air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis under different zoom factors satisfies: 2.48≤f W / D3≤65.

74.

16. The zoom lens assembly according to claim 1, wherein: The Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: V1-V2=35.7.

Images