Zoom lens set

Abstract

The present invention provides a zoom lens group, which includes: The first lens group includes a first lens with a negative optical power and a second lens with a positive optical power; the second lens group includes a third lens with a positive optical power and a fourth lens with a negative optical power; the third lens group includes a fifth lens with a negative optical power; the fourth lens group includes a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens; the difference △f between the effective focal length of the zoom lens group in the telephoto end state and the effective focal length of the zoom lens in the wide-angle end state satisfies: 10.8mm < △f < 15.0mm; the relationship between the effective focal length fw of the zoom lens group in the wide-angle end state and the effective focal length f5 of the fifth lens satisfies: -2.4 < fw / f5 < -1.0; the relationship between the effective focal length FG2 of the second lens group and the effective focal length FG4 of the fourth lens group satisfies: 1.3 < FG2 / FG4 < 2.5. The present invention solves the problem in the prior art that it is difficult to balance the miniaturization, large focal length range, and high image quality of the zoom lens group.

Description

Technical Field

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

[0002] Smartphones have an increasing demand for high-performance lenses. In order to meet the different shooting needs of users, mobile phones often require multiple lenses with different designs to be suitable for shooting needs of different purposes. To meet these different shooting needs, usually 4 or more lenses are required to cover various focal lengths, and at the same time, more large-size high-resolution CMOS photosensitive chips are needed, which greatly increases the production cost and occupies more space in the mobile phone, which is very unfavorable for weight reduction and cost reduction of the mobile phone. For the design of optical systems, the design of zoom lenses is always more difficult than that of fixed-focus lenses under the same specifications. The zoom lens with a larger number of lenses not only has a large volume and weight, but also has a smaller change in the achievable focal length, and at the same time, it is easy to have problems such as unclear imaging and poor image quality during the zoom process. Therefore, how to design the lenses in the zoom lens group and the focal length distribution of the lens groups is a very important issue to achieve high image quality while ensuring miniaturization and light weight. Summary of the Invention

[0003] The main object of the present invention is to provide a zoom lens group to solve the problem that it is difficult to balance miniaturization, large focal length, and high image quality in the existing zoom lens group.

[0004] To achieve the above object, according to one aspect of the present invention, there is provided a zoom lens group. Along the object side to the image side of the zoom lens group, the zoom lens group includes: a first lens group including a first lens with a negative optical power and a second lens with a positive optical power; a second lens group including a third lens with a positive optical power and a fourth lens with a negative optical power; a third lens group including a fifth lens with a negative optical power; a fourth lens group including a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with an optical power; wherein, the second lens group and the third lens group are moved to change the air gap between any two adjacent ones of the first lens group to the fourth lens group on the optical axis of the zoom lens group to achieve zooming of the zoom lens group; the difference △f between the effective focal length of the zoom lens group in the telephoto state and the effective focal length of the zoom lens in the wide-angle state satisfies: 10.8mm < △f < 15.0mm; the relationship between the effective focal length fw of the zoom lens group in the wide-angle state and the effective focal length f5 of the fifth lens satisfies: -2.4 < fw / f5 < -1.0; the relationship between the effective focal length FG2 of the second lens group and the effective focal length FG4 of the fourth lens group satisfies: 1.3 < FG2 / FG4 < 2.5.

[0005] According to another aspect of the present invention, a zoom lens group is provided. From the object side to the image side of the zoom lens group, the zoom lens group includes: a first lens group having a positive optical power, the first lens group including a first lens having a negative optical power and a second lens having a positive optical power; a second lens group having a positive optical power, the second lens group including a third lens having a positive optical power and a fourth lens having a negative optical power; a third lens group including a fifth lens having a negative optical power; a fourth lens group having a positive optical power, the fourth lens group including a sixth lens having a positive optical power, a seventh lens having a negative optical power, and an eighth lens having an optical power; wherein, the second lens group and the third lens group are moved to change the air gap on the optical axis of any two adjacent ones of the first lens group to the fourth lens group in the zoom lens group, so as to achieve zooming of the zoom lens group; the difference △f between the effective focal length of the zoom lens group in the telephoto state and the effective focal length of the zoom lens in the wide-angle state satisfies: 10.8mm < △f < 15.0mm; the relationship between the effective focal length fw of the zoom lens group in the wide-angle state and the effective focal length f5 of the fifth lens satisfies: -2.4 < fw / f5 < -1.0; the relationship between the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length FG4 of the fourth lens group satisfies: 1.0 < (|f5| + f6) / FG4 < 2.0. The present application provides an eight-piece zoom lens group, in which the positive and negative optical powers of the lenses of each of the four lens groups are reasonably distributed, and by moving the second lens group and the third lens group, the on-axis distance of each lens group is changed, thereby changing the effective focal length of the zoom lens group, so that the change in the effective focal length can be ensured to be within 10.8mm to 15.0mm. By controlling the effective focal length of the zoom lens group in the wide-angle state, the effective focal lengths of the fourth lens group, and the fifth and sixth lenses, the focal length values of each lens group are reasonably distributed, while reducing weight and cost, meeting the continuous zooming ability of the zoom lens group and having a large focal length change, and effectively improving the aberration of the zoom lens group to ensure clear imaging.

[0006] According to another aspect of the present invention, a zoom lens group is provided. Along the object side to the image side of the zoom lens group, the zoom lens group includes: a first lens group, the first lens group includes a first lens with a negative optical power and a second lens with a positive optical power. The object side and the image side of the first lens are both concave surfaces, and the object side and the image side of the second lens are both convex surfaces; a second lens group, the second lens group includes a third lens with a positive optical power and a fourth lens with a negative optical power. The object side and the image side of the third lens are both convex surfaces, the object side of the fourth lens is concave, and the image side of the fourth lens is convex; a third lens group, the third lens group includes a fifth lens with a negative optical power. The object side and the image side of the fifth lens are both concave surfaces; a fourth lens group, the fourth lens group includes a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with an optical power. The object side and the image side of the sixth lens are both convex surfaces, the object side of the seventh lens is convex, and the image side of the seventh lens is concave. Wherein, the second lens group and the third lens group are moved to change the air gap on the optical axis of any two adjacent ones among the first lens group to the fourth lens group in the zoom lens group, so as to achieve zooming of the zoom lens group; the difference △f between the effective focal length of the zoom lens group in the telephoto end state and the effective focal length of the zoom lens in the wide-angle end state satisfies: 10.8mm < △f < 15.0mm; the effective focal length fw of the zoom lens group in the wide-angle end state and the effective focal length f5 of the fifth lens satisfy: -2.4 < fw / f5 < -1.0; the effective focal length fw of the zoom lens group in the wide-angle end state and half of the field angle Semi-FOVw of the zoom lens group in the wide-angle end state satisfy: 3.0mm < fw * tan(Semi-FOVw) < 3.8mm. The present application provides an eight-piece zoom lens group. The positive and negative of the optical power of each lens of the four lens groups are reasonably distributed, and by moving the second lens group and the third lens group, the axial distance of each lens group is changed to change the effective focal length of the zoom lens group, so that the change of the effective focal length can be ensured to be within 10.8mm to 15.0mm. By controlling the effective focal length, the field angle of the zoom lens group in the wide-angle end state, and the effective focal length of the fifth lens, while reducing weight and cost, it satisfies that the zoom lens group has continuous zooming ability and has a large focal length change, which is beneficial to the zoom lens group to achieve the characteristics of telephoto and high zoom, and still has good imaging quality during continuous zooming.

[0007] Furthermore, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length FG4 of the fourth lens group satisfy: 1.0 < (|f5| + f6) / FG4 < 2.0.

[0008] Furthermore, the total length TTL of the zoom lens group and the air gap D1w on the optical axis of the first lens group and the second lens group of the zoom lens group in the wide-angle end state satisfy: 2.7 < TTL / D1w < 4.8.

[0009] Furthermore, the total length TTL of the zoom lens group, the effective focal length ft of the zoom lens group in the telephoto end state, and the aperture number FNOt of the zoom lens group in the telephoto end state satisfy the following conditions: 3.4 <TTL / ft*FNOt<4.4。

[0010] Furthermore, the air gap D1t between the first lens group and the second lens group on the optical axis when the zoom lens group is in the telephoto end state, the air gap D1w between the first lens group and the second lens group on the optical axis when the zoom lens group is in the wide-angle end state, and the difference △Semi-FOV between half of the field of view angle of the zoom lens group in the wide-angle end state and half of the field of view angle of the zoom lens group in the telephoto end state satisfy the following conditions: 0 <D1t / D1w*tan(△Semi-FOV)<12.0。

[0011] Furthermore, the object-side surface of the fourth lens is concave, the image-side surface of the fourth lens is convex, and the curvature radius R7 of the object-side surface of the fourth lens and the curvature radius R8 of the image-side surface of the fourth lens satisfy: -11.0<(R7+R8) / (R7-R8)<-6.5.

[0012] Furthermore, the object-side surface of the fifth lens is concave, the image-side surface of the fifth lens is concave, and the curvature radius R8 of the image-side surface of the fourth lens and the curvature radius R9 of the object-side surface of the fifth lens satisfy the following relationship: 6.9<(R8+R9) / (R8-R9)<8.5.

[0013] Furthermore, the center thickness CT6 of the sixth lens, the center thickness CT7 of the seventh lens, and the center thickness CT8 of the eighth lens satisfy the following relationship: 0.5 <CT6 / (CT7+CT8)<1.0。

[0014] Furthermore, the air gap T78 between the seventh lens and the eighth lens on the optical axis, the center thickness CT6 of the sixth lens, the center thickness CT7 of the seventh lens, the center thickness CT8 of the eighth lens, and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy the following conditions: 0.9 <T78 / (CT6+T67+CT7+CT8)<1.4。

[0015] Furthermore, the effective focal length f5 of the fifth lens, the curvature radius R9 of the object side surface of the fifth lens, and the curvature radius R10 of the image side surface of the fifth lens satisfy the following relationship: 1.8 <f5 / (R9+R10)<2.4。

[0016] Furthermore, a difference ΔSemi-FOV between half of the field of view angle when the zoom lens group is in the wide-angle end state and half of the field of view angle when the zoom lens group is in the telephoto end state satisfies: 5.0<ΔSemi-FOV<13.7.

[0017] Furthermore, the effective focal length fw of the zoom lens group when in the wide-angle end state and the half of the field of view angle Semi-FOVw of the zoom lens group when in the wide-angle end state satisfy: 3.0mm <fw*tan(Semi-FOVw)<3.8mm。

[0018] Furthermore, the edge thickness ET1 of the first lens at the maximum effective semi-aperture, the center thickness CT1 of the first lens, and the refractive index N1 of the first lens satisfy the following conditions: 3.5 <ET1 / CT1*N1<5.0。

[0019] Furthermore, a curvature radius R14 of the image-side surface of the seventh lens, a curvature radius R15 of the object-side surface of the eighth lens, and an air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 0<(R14+R15) / T78<2.0.

[0020] Furthermore, the effective focal length FG4 of the fourth lens group, the effective focal length ft of the zoom lens group at the telephoto end state, the sum of the center thicknesses ΣCT of all lenses in the zoom lens group, and the center thickness CT6 of the sixth lens satisfy the following relationship: 3.8 <FG4 / ft+∑CT / CT6<4.8。

[0021] Furthermore, the center thickness CT3 of the third lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the center thickness CT4 of the fourth lens satisfy the following conditions: 1.4 <CT3 / (T34+CT4)<2.5。

[0022] Furthermore, the maximum effective semi-aperture DT42 of the image side surface of the fourth lens, the maximum effective semi-aperture DT52 of the image side surface of the fifth lens, the maximum effective semi-aperture DT22 of the image side surface of the second lens, and the maximum effective semi-aperture DT32 of the image side surface of the third lens satisfy the following relationship: 0.8<(DT42-DT52) / (DT22-DT32)<1.5.

[0023] Furthermore, the on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the effective half-aperture vertex of the image side surface of the second lens, the on-axis distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective half-aperture vertex of the object side surface of the second lens, and the on-axis distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective half-aperture vertex of the object side surface of the third lens satisfy the following conditions: -0.7 <SAG22 / (SAG21+SAG31)≤-0.35。

[0024] Further, the air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the difference △D2 between the air gap between the second lens group and the third lens group on the optical axis in the wide-angle state of the zoom lens group and the air gap between the second lens group and the third lens group on the optical axis in the wide-angle state of the zoom lens group satisfy: 3.5 < (T34 + T56) / △D2 < 6.1.

[0025] Further, the total length TTL of the zoom lens group remains unchanged.

[0026] Applying the technical solution of the present invention, from the object side to the image side of the zoom lens group, the zoom lens group includes a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes a first lens with a negative optical power and a second lens with a positive optical power; the second lens group includes a third lens with a positive optical power and a fourth lens with a negative optical power; the third lens group includes a fifth lens with a negative optical power; the fourth lens group includes a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with an optical power; wherein, the second lens group and the third lens group are moved to change the air gap between any two adjacent ones of the first lens group to the fourth lens group on the optical axis of the zoom lens group, so as to achieve zooming of the zoom lens group; the difference △f between the effective focal length of the zoom lens group in the telephoto state and the effective focal length of the zoom lens in the wide-angle state satisfies: 10.8 mm < △f < 15.0 mm; the relationship between the effective focal length fw of the zoom lens group in the wide-angle state and the effective focal length f5 of the fifth lens satisfies: -2.4 < fw / f5 < -1.0; the relationship between the effective focal length FG2 of the second lens group and the effective focal length FG4 of the fourth lens group satisfies: 1.3 < FG2 / FG4 < 2.5.

[0027] The present application provides an eight-piece zoom lens group. The positive and negative optical powers of each lens of the four lens groups are reasonably distributed, and by moving the second lens group and the third lens group, the axial distance of each lens group is changed, thereby changing the effective focal length of the zoom lens group, so that the change in the effective focal length can be guaranteed to be within the range of 10.8 mm to 15.0 mm. By controlling the effective focal length of the zoom lens group in the wide-angle state, the effective focal lengths of the second lens group, the fourth lens group, and the fifth lens, the focal length values of each lens group are reasonably distributed, while reducing weight and cost, meeting the continuous zooming ability of the zoom lens group and having a large focal length change, and ensuring clear imaging. Description of the Drawings

[0028] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 A schematic structural diagram of the zoom lens assembly in the wide-angle end state according to the first embodiment of the present invention is shown;

[0030] Figure 2 A schematic structural diagram of the zoom lens assembly in an intermediate state according to the first embodiment of the present invention is shown;

[0031] Figure 3 A schematic structural diagram of the zoom lens assembly in the telephoto end state according to the first embodiment of the present invention is shown;

[0032] Figure 4 and Figure 5 Shown respectively Figure 1 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0033] Figure 6 and Figure 7 Shown respectively Figure 2 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0034] Figure 8 and Figure 9 Shown respectively Figure 3 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0035] Figure 10 A schematic structural diagram of a zoom lens assembly in a wide-angle end state according to a second embodiment of the present invention is shown;

[0036] Figure 11 A schematic structural diagram of a zoom lens assembly in an intermediate state according to a second embodiment of the present invention is shown;

[0037] Figure 12 A schematic structural diagram of a zoom lens assembly in a telephoto end state according to a second embodiment of the present invention is shown;

[0038] Figure 13 and Figure 14 Shown respectively Figure 10 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0039] Figure 15 and Figure 16 Shown respectively Figure 11 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0040] Figure 17 and Figure 18 Shown respectively Figure 12 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0041] Figure 19A schematic structural diagram of a zoom lens assembly in a wide-angle end state according to a third embodiment of the present invention is shown;

[0042] Figure 20 A schematic structural diagram of a zoom lens assembly in an intermediate state according to a third embodiment of the present invention is shown;

[0043] Figure 21 A schematic structural diagram of a zoom lens assembly in a telephoto end state according to a third embodiment of the present invention is shown;

[0044] Figure 22 and Figure 23 Shown respectively Figure 19 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0045] Figure 24 and Figure 25 Shown respectively Figure 20 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0046] Figure 26 and Figure 27 Shown respectively Figure 21 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0047] Figure 28 A schematic structural diagram of a zoom lens assembly in a wide-angle end state according to a fourth embodiment of the present invention is shown;

[0048] Figure 29 A schematic structural diagram of a zoom lens assembly in an intermediate state according to a fourth embodiment of the present invention is shown;

[0049] Figure 30 A schematic structural diagram of a zoom lens assembly in a telephoto end state according to a fourth embodiment of the present invention is shown;

[0050] Figure 31 and Figure 32 Shown respectively Figure 28 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0051] Figure 33 and Figure 34 Shown respectively Figure 29 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0052] Figure 35 and Figure 36 Shown respectively Figure 30 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0053] Figure 37 A schematic structural diagram of a zoom lens assembly in a wide-angle end state according to a fifth embodiment of the present invention is shown;

[0054] Figure 38 A schematic structural diagram of a zoom lens assembly in an intermediate state according to a fifth embodiment of the present invention is shown;

[0055] Figure 39 A schematic structural diagram of a zoom lens assembly in a telephoto end state according to a fifth embodiment of the present invention is shown;

[0056] Figure 40 and Figure 41 Shown respectively Figure 37 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0057] Figure 42 and Figure 43 Shown respectively Figure 38 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0058] Figure 44 and Figure 45 Shown respectively Figure 39 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0059] Figure 46 A schematic structural diagram of a zoom lens assembly in a wide-angle end state according to a sixth embodiment of the present invention is shown;

[0060] Figure 47 A schematic structural diagram of a zoom lens assembly in an intermediate state according to a sixth embodiment of the present invention is shown;

[0061] Figure 48 FIG2 shows a schematic structural diagram of a zoom lens assembly in a telephoto end state according to a sixth embodiment of the present invention;

[0062] Figure 49 and Figure 50 Shown respectively Figure 46 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0063] Figure 51 and Figure 52 Shown respectively Figure 47 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0064] Figure 53 and Figure 54 Shown respectively Figure 48 The axial chromatic aberration curve and astigmatism curve of the zoom lens group;

[0065] Figure 55 A schematic diagram showing some parameters of a zoom lens assembly according to any optional embodiment of the present invention is shown.

[0066] The above drawings include the following reference numerals:

[0067] STO, aperture; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; 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 fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens;

[0068] 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, eighth lens; S15, object-side surface of the eighth lens; S16, image-side surface of the eighth lens; S17, imaging surface. DETAILED DESCRIPTION

[0069] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0070] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0071] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0072] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0073] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0074] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the convex surface position is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the concave surface position is not defined, it means that the lens surface is concave at least in the paraxial area. The surface of each lens close to the object side is called the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The judgment of the surface shape in the paraxial area can be based on the judgment method of common knowledge in this field, and the positive and negative R value (R refers to the curvature radius of the paraxial area, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the convexity. In terms of the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; in terms of the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0075] It should be noted that in the present application, when the air spacing between the second lens group and the third lens group on the optical axis is the largest, the zoom lens group is in the telephoto end state; when the air spacing between the second lens group and the third lens group on the optical axis is the smallest, the zoom lens group is in the wide-angle end state; and when the air spacing between the second lens group and the third lens group on the optical axis is in the range between the minimum and the maximum, the zoom lens group is in the intermediate end state. The total length TTL of the zoom lens group is the distance from the object side surface of the first lens to the imaging surface of the zoom lens group along the optical axis. The TTL of the zoom lens group of the present application remains unchanged during the zooming process, which is conducive to the miniaturization of the zoom lens group. The air spacing between the first lens group and the second lens group on the optical axis is the air spacing from the image side surface of the second lens to the object side surface of the third lens on the optical axis, the air spacing between the second lens group and the third lens group on the optical axis is the air spacing from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis, and the air spacing between the third lens group and the fourth lens group on the optical axis is the air spacing from the image side surface of the fifth lens to the object side surface of the sixth lens on the optical axis.

[0076] In order to solve the problem in the prior art that it is difficult to achieve a compact zoom lens assembly with a large focal length and high image quality, the present invention provides a zoom lens assembly.

[0077] First embodiment

[0078] like Figures 1 to 55As shown in the figure, from the object side to the image side of the zoom lens group, the zoom lens group includes a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes a first lens with a negative optical power and a second lens with a positive optical power; the second lens group includes a third lens with a positive optical power and a fourth lens with a negative optical power; the third lens group includes a fifth lens with a negative optical power; the fourth lens group includes a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with an optical power. Among them, by moving the second lens group and the third lens group, the air gap between any two adjacent ones of the first lens group to the fourth lens group on the optical axis of the zoom lens group is changed to achieve zooming of the zoom lens group. The difference △f between the effective focal length of the zoom lens group in the telephoto state and the effective focal length of the zoom lens in the wide-angle state satisfies: 10.8mm < △f < 15.0mm; between the effective focal length fw of the zoom lens group in the wide-angle state and the effective focal length f5 of the fifth lens, it satisfies: -2.4 < fw / f5 < -1.0; between the effective focal length FG2 of the second lens group and the effective focal length FG4 of the fourth lens group, it satisfies: 1.3 < FG2 / FG4 < 2.5.

[0079] This application provides an eight-piece zoom lens group. The positive and negative of the optical power of each lens of the four lens groups are reasonably distributed. By moving the second lens group and the third lens group, the axial distance of each lens group is changed to change the effective focal length of the zoom lens group, so that the change in the effective focal length can be guaranteed to be within 10.8mm to 15.0mm. By controlling the effective focal length of the zoom lens group in the wide-angle state, the effective focal lengths of the second lens group, the fourth lens group, and the fifth lens, the focal length values of each lens group are reasonably distributed, while reducing weight and cost, meeting the continuous zooming ability of the zoom lens group and having a large focal length change, and ensuring clear imaging.

[0080] Preferably, 10.9mm < △f < 14.9mm.

[0081] Preferably, -2.3 < fw / f5 < -1.1.

[0082] Preferably, 1.4 < FG2 / FG4 < 2.4.

[0083] In this embodiment, between the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length FG4 of the fourth lens group, it satisfies: 1.0 < (|f5| + f6) / FG4 < 2.0. By limiting (|f5| + f6) / FG4 within a reasonable range, the optical power of the third lens group and the fourth lens group can be reasonably distributed, effectively improving the aberration of the zoom lens group. Preferably, 1.1 < (|f5| + f6) / FG4 < 1.8.

[0084] In this embodiment, the total length TTL of the zoom lens group, and the air gap D1w between the first lens group and the second lens group on the optical axis in the wide-angle state of the zoom lens group satisfy: 2.7 < TTL / D1w < 4.8. By restricting TTL / D1w within a reasonable range, the front-end size of the zoom lens group is controlled, avoiding the zoom lens group from being too large in volume, while controlling the processing difficulty and ensuring the durability of the zoom lens group. Preferably, 2.75 < TTL / D1w < 4.78.

[0085] In this embodiment, the total length TTL of the zoom lens group, the effective focal length ft in the telephoto state of the zoom lens group, and the f-number FNOt in the telephoto state of the zoom lens group satisfy: 3.4 < TTL / ft * FNOt < 4.4. By restricting TTL / ft * FNOt within a reasonable range, it is beneficial to ensure the telephoto state of the zoom lens group and ensure sufficient depth of field. Preferably, 3.5 < TTL / ft * FNOt < 4.3.

[0086] In this embodiment, the air gap D1t between the first lens group and the second lens group on the optical axis in the telephoto state of the zoom lens group, the air gap D1w between the first lens group and the second lens group on the optical axis in the wide-angle state of the zoom lens group, and the difference △Semi-FOV between half of the field angle in the wide-angle state of the zoom lens group and half of the field angle in the telephoto state of the zoom lens group satisfy: 0 < D1t / D1w * tan(△Semi-FOV) < 12.0. By restricting D1t / D1w * tan(△Semi-FOV) within a reasonable range, the change value of the air gap between the first lens group and the second lens group on the optical axis when switching between wide-angle and telephoto is reasonably controlled and distributed, so as to control the size of the zoom lens group, while ensuring the reliability and durability of the mechanical moving parts. Preferably, 0.2 < D1t / D1w * tan(△Semi-FOV) < 12.0.

[0087] In this embodiment, the object side surface of the fourth lens is concave, the image side surface of the fourth lens is convex, and 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 satisfy: -11.0 < (R7 + R8) / (R7 - R8) < -6.5. By restricting (R7 + R8) / (R7 - R8) within a reasonable range, the fourth lens has good processability, and can also reduce the size of optical distortion, ensuring that the zoom lens group has good imaging quality. Preferably, -10.9 < (R7 + R8) / (R7 - R8) < -6.7. <{

[0088] In this embodiment, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is concave. The relationship between the radius of curvature R8 of the image side surface of the fourth lens and the radius of curvature R9 of the object side surface of the fifth lens satisfies: 6.9 < (R8 + R9) / (R8 - R9) < 8.5. By restricting (R8 + R9) / (R8 - R9) within a reasonable range, the fifth lens has good processability, and can also reduce the magnitude of optical distortion, ensuring that the zoom lens group has good imaging quality. Preferably, 6.95 < (R8 + R9) / (R8 - R9) < 8.45.

[0089] In this embodiment, the relationship between the central thickness CT6 of the sixth lens, the central thickness CT7 of the seventh lens, and the central thickness CT8 of the eighth lens satisfies: 0.5 < CT6 / (CT7 + CT8) < 1.0. By restricting CT6 / (CT7 + CT8) within a reasonable range, controlling the central thickness distribution of the sixth, seventh, and eighth lenses to constrain the space occupancy of the fourth lens group can effectively control the size of the zoom lens group, avoid the zoom lens group from being too large in volume, and is also conducive to structural adjustment and layout, facilitating production. Preferably, 0.6 < CT6 / (CT7 + CT8) < 1.0.

[0090] In this embodiment, the relationship between the air gap T78 on the optical axis between the seventh lens and the eighth lens, the central thickness CT6 of the sixth lens, the central thickness CT7 of the seventh lens, the central thickness CT8 of the eighth lens, and the air gap T67 on the optical axis between the sixth lens and the seventh lens satisfies: 0.9 < T78 / (CT6 + T67 + CT7 + CT8) < 1.4. By restricting T78 / (CT6 + T67 + CT7 + CT8) within a reasonable range, controlling the central thickness and gaps of each lens in the fourth lens group can effectively control the size of the key parts of the zoom lens group, ensure the processability of the zoom lens group, is conducive to structural adjustment and layout, and facilitates production. Preferably, 0.9 < T78 / (CT6 + T67 + CT7 + CT8) < 1.3.

[0091] In this embodiment, the relationship between the effective focal length f5 of the fifth lens, the radius of curvature R9 of the object side surface of the fifth lens, and the radius of curvature R10 of the image side surface of the fifth lens satisfies: 1.8 < f5 / (R9 + R10) < 2.4. By restricting f5 / (R9 + R10) within a reasonable range, the shape of the fifth lens can be reasonably set, which is conducive to the processing and forming of the fifth lens. Preferably, 1.85 < f5 / (R9 + R10) < 2.30.

[0092] In this embodiment, the difference △Semi-FOV between half of the field angle of the zoom lens group in the wide-angle end state and half of the field angle of the zoom lens group in the telephoto end state satisfies: 5.0 < △Semi-FOV < 13.7. By restricting △Semi-FOV within a reasonable range, the switching between the wide-angle end state and the telephoto end state of the zoom lens group can be ensured on the premise of having a relatively wide range of focal lengths, achieving clear imaging while satisfying a large focal length range. Preferably, 5.2 < △Semi-FOV < 13.7.

[0093] In this embodiment, between the effective focal length fw of the zoom lens group in the wide-angle end state and half of the field angle Semi-FOVw of the zoom lens group in the wide-angle end state, it satisfies: 3.0 mm < fw * tan(Semi-FOVw) < 3.8 mm. By restricting fw * tan(Semi-FOVw) within a reasonable range, it is beneficial for the zoom lens group to achieve the characteristics of telephoto and high zoom, and still have good imaging quality during continuous zooming. Preferably, 3.1 mm < fw * tan(Semi-FOVw) < 3.7 mm.

[0094] In this embodiment, between the edge thickness ET1 at the maximum effective semi-aperture of the first lens, the central thickness CT1 of the first lens, and the refractive index N1 of the first lens, it satisfies: 3.5 < ET1 / CT1 * N1 < 5.0. By restricting ET1 / CT1 * N1 within a reasonable range, the thickening ratio of the first lens is reasonably controlled, ensuring the processability of the first lens and being beneficial for the forming process of the first lens. Preferably, 3.6 < ET1 / CT1 * N1 < 4.9.

[0095] In this embodiment, between the curvature radius R14 of the image side of the seventh lens, the curvature radius R15 of the object side of the eighth lens, and the air gap T78 between the seventh lens and the eighth lens on the optical axis, it satisfies: 0 < (R14 + R15) / T78 < 2.0. By restricting (R14 + R15) / T78 within a reasonable range, the optical power of the seventh lens and the eighth lens can be reasonably distributed under a certain mechanical mobility to reduce the magnitude of optical distortion and ensure better imaging quality. Preferably, 0.1 < (R14 + R15) / T78 < 1.9.

[0096] In this embodiment, the effective focal length FG4 of the fourth lens group, the effective focal length ft of the zoom lens group in the telephoto state, the sum ∑CT of the central thicknesses of all the lenses in the zoom lens group, and the central thickness CT6 of the sixth lens satisfy: 3.8 < FG4 / ft + ∑CT / CT6 < 4.8. By restricting FG4 / ft + ∑CT / CT6 within a reasonable range, the contribution ratio of the fourth lens group to the overall focal length can be reasonably distributed. The sixth lens is the first lens of the fourth lens group close to the object side. Reasonably setting its central thickness is beneficial to restricting its focal length and size to better connect with the front and rear lenses. Preferably, 3.9 < FG4 / ft + ∑CT / CT6 < 4.87.

[0097] In this embodiment, the central thickness CT3 of the third lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the central thickness CT4 of the fourth lens satisfy: 1.4 < CT3 / (T34 + CT4) < 2.5. By restricting CT3 / (T34 + CT4) within a reasonable range, the size of the second lens group can be effectively controlled, avoiding the excessive volume of the zoom lens group. At the same time, it is also beneficial to the structural adjustment and layout. Preferably, 1.5 < CT3 / (T34 + CT4) < 2.5.

[0098] In this embodiment, the maximum effective semi-aperture DT42 of the image side of the fourth lens, the maximum effective semi-aperture DT52 of the image side of the fifth lens, the maximum effective semi-aperture DT22 of the image side of the second lens, and the maximum effective semi-aperture DT32 of the image side of the third lens satisfy: 0.8 < (DT42 - DT52) / (DT22 - DT32) < 1.5. By restricting (DT42 - DT52) / (DT22 - DT32) within a reasonable range, the effective diameter segment difference of the second to fifth lenses and the radial size of the zoom lens group can be reasonably controlled, improving the matching degree with the chip. At the same time, it is beneficial to adjusting the structure of the zoom lens group. Preferably, 0.9 < (DT42 - DT52) / (DT22 - DT32) < 1.4.

[0099] In this embodiment, the axial distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective semi-aperture of the image side surface of the second lens, the axial distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective semi-aperture of the object side surface of the second lens, and the axial distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective semi-aperture of the object side surface of the third lens satisfy: -0.7 < SAG22 / (SAG21 + SAG31) ≤ -0.35. By restricting SAG22 / (SAG21 + SAG31) within a reasonable range, it is beneficial to control the front and rear sagittal of the second lens and the third lens, constrain the curvature of the overall shape of the lens, adjust the light deflection angle, and enable the light to enter the next lens group well after passing through the second lens, thereby obtaining the best imaging quality.

[0100] In this embodiment, the air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the difference △D2 between the air gap on the optical axis between the second lens group and the third lens group in the wide-angle state of the zoom lens group and the air gap on the optical axis between the second lens group and the third lens group in the wide-angle state of the zoom lens group satisfy: 3.5 < (T34 + T56) / △D2 < 6.1. By restricting (T34 + T56) / △D2 within a reasonable range, the △D2 gap is controlled under certain mechanical mobility and processability conditions to ensure the zoom range. Preferably, 3.5 < (T34 + T56) / △D2 < 6.0.

[0101] Second Embodiment

[0102] As Figures 1 to 55As shown, from the object side to the image side of the zoom lens group, the zoom lens group includes a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group has a positive optical power, and the first lens group includes a first lens with a negative optical power and a second lens with a positive optical power; the second lens group has a positive optical power, and the second lens group includes a third lens with a positive optical power and a fourth lens with a negative optical power; the third lens group includes a fifth lens with a negative optical power; the fourth lens group has a positive optical power, and the fourth lens group includes a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with an optical power; wherein, the second lens group and the third lens group are moved to change the air gap on the optical axis of any two adjacent ones among the first lens group to the fourth lens group in the zoom lens group, so as to achieve zooming of the zoom lens group; the difference △f between the effective focal length of the zoom lens group in the telephoto state and the effective focal length of the zoom lens in the wide-angle state satisfies: 10.8mm < △f < 15.0mm; the relationship between the effective focal length fw of the zoom lens group in the wide-angle state and the effective focal length f5 of the fifth lens satisfies: -2.4 < fw / f5 < -1.0; the relationship between the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length FG4 of the fourth lens group satisfies: 1.0 < (|f5| + f6) / FG4 < 2.0.

[0103] The present application provides an eight-piece zoom lens group. The positive and negative of the optical power of each lens of the four lens groups are reasonably distributed, and by moving the second lens group and the third lens group, the on-axis distance of each lens group is changed, thereby changing the effective focal length of the zoom lens group, so that the change in the effective focal length can be ensured to be within 10.8mm to 15.0mm. By controlling the effective focal length of the zoom lens group in the wide-angle state, the effective focal lengths of the fourth lens group, the fifth lens, and the sixth lens, the focal length values of each lens group are reasonably distributed, while reducing weight and cost, meeting the continuous zooming ability of the zoom lens group and having a large focal length change, and effectively improving the aberration of the zoom lens group to ensure clear imaging.

[0104] Preferably, 10.9mm < △f < 14.9mm.

[0105] Preferably, -2.3 < fw / f5 < -1.1.

[0106] [[ID=​​​​​​​​​​As shown in the figure, from the object side to the image side of the zoom lens group, the zoom lens group includes a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes a first lens with a negative optical power and a second lens with a positive optical power. The object side surface and the image side surface of the first lens are both concave surfaces, and the object side surface and the image side surface of the second lens are both convex surfaces. The second lens group includes a third lens with a positive optical power and a fourth lens with a negative optical power. The object side surface and the image side surface of the third lens are both convex surfaces, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface. The third lens group includes a fifth lens with a negative optical power, and the object side surface and the image side surface of the fifth lens are both concave surfaces. The fourth lens group includes a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with an optical power. The object side surface and the image side surface of the sixth lens are both convex surfaces, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface. Among them, the second lens group and the third lens group are moved to change the air gap on the optical axis of any two adjacent ones from the first lens group to the fourth lens group in the zoom lens group, so as to achieve the zoom of the zoom lens group. The difference △f between the effective focal length of the zoom lens group in the telephoto end state and the effective focal length of the zoom lens in the wide-angle end state satisfies: 10.8mm < △f < 15.0mm. The relationship between the effective focal length fw of the zoom lens group in the wide-angle end state and the effective focal length f5 of the fifth lens satisfies: -2.4 < fw / f5 < -1.0. The relationship between the effective focal length fw of the zoom lens group in the wide-angle end state and half of the field angle Semi-FOVw of the zoom lens group in the wide-angle end state satisfies: 3.0mm < fw * tan(Semi-FOVw) < 3.8mm.

[0110] The present application provides an eight-piece zoom lens group. The positive and negative of the optical power of each lens in the four lens groups are reasonably distributed. By moving the second lens group and the third lens group, the on-axis distance of each lens group is changed, thereby changing the effective focal length of the zoom lens group, so that the change in the effective focal length can be ensured to be within 10.8mm to 15.0mm. By controlling the effective focal length, the field angle of the zoom lens group in the wide-angle end state, and the effective focal length of the fifth lens, while reducing weight and cost, it satisfies that the zoom lens group has continuous zoom ability and has a large focal length change, which is beneficial to the zoom lens group to achieve the characteristics of telephoto and high zoom, and still has good imaging quality during continuous zoom.

[0111] Preferably, 10.9mm < △f < 14.9mm.

[0112] Preferably, -2.3 < fw / f5 < -1.1.

[0113] Preferably, 3.1mm < fw * tan(Semi-FOVw) < 3.7mm.

[0114] It should be noted that this embodiment may also include other conditional expressions in the first embodiment, which will not be detailed here.

[0115] Optionally, the zoom lens assembly may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0116] like Figure 55 The following is a schematic diagram of some parameters of the zoom lens group of the present application. The figure schematically shows only some lens groups of the zoom lens group. The SAG value has positive and negative signs. In the present application, the direction of the intersection of the intersection of one side of the lens with the optical axis and the perpendicular line of the vertex of the effective radius of the surface on the optical axis is defined. If the direction is from the object side of the zoom lens group to the image side, the SAG is a positive value. If the direction is from the image side of the zoom lens group to the object side, the SAG is a negative value.

[0117] The zoom lens assembly in this application can utilize multiple lenses, such as the eight lenses described above. By properly allocating the optical power, surface shape, center thickness of each lens, and the on-axis distance between lenses, the aperture of the zoom lens assembly can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the zoom lens assembly more convenient for production and processing and suitable for portable electronic devices such as smartphones.

[0118] In this application, at least one of the lens surfaces is an aspheric surface. Aspheric lenses are characterized by a continuously varying curvature from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspheric lenses have a more optimized curvature radius, offering advantages in reducing distortion and astigmatism. The use of aspheric lenses minimizes aberrations that occur during imaging, thereby improving image quality.

[0119] The following further describes examples of specific surface shapes and parameters of the zoom lens assembly applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0120] It should be noted that any one of the following embodiments 1 to 6 is applicable to all implementation methods of the present application.

[0121] Example 1

[0122] like Figures 1 to 9 As shown, the zoom lens group of embodiment 1 of the present application is described. Figure 1 The figure shows a schematic structural diagram of the zoom lens assembly in the wide-angle end state according to the first embodiment. Figure 2 A schematic structural diagram of the zoom lens assembly of the first embodiment in the middle end state is shown. Figure 3 The diagram shows the structure of the zoom lens assembly in the telephoto end state according to the first embodiment.

[0123] like Figures 1 to 3 As shown, the zoom lens group includes, from object side to image side, the following: a first lens group, a second lens group, a third lens group, an aperture stop STO, a fourth lens group, and an imaging surface S17. The first lens group includes a first lens E1 and a second lens E2; the second lens group includes a third lens E3 and a fourth lens E4; the third lens group includes a fifth lens E5; and the fourth lens group includes a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[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 convex. 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 negative 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 positive optical power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex, and its image-side surface S14 being concave. The eighth lens element E8 has negative optical power. The object-side surface S15 of the eighth lens element is concave, and the image-side surface S16 of the eighth lens element is convex. Light from an object passes through each surface S1 to S16 in sequence and is ultimately imaged on the imaging surface S17.

[0125] Table 1 shows the basic structural parameters of the zoom lens assembly of Example 1, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0126] Face number Face shape Radius of curvature thickness Refractive index Abbe number Cone coefficient OBJ spherical surface endless endless S1 Aspheric -100.4485 0.4000 1.658 20.04 0 S2 Aspheric 13.4700 0.0300 0 S3 Aspheric 10.9495 1.4613 1.553 48.80 0 S4 Aspheric -26.6553 D1 0 S5 Aspheric 24.6229 1.1279 1.637 22.31 0 S6 Aspheric -12.9912 0.3365 0 S7 Aspheric -8.9627 0.4000 1.591 28.42 0 S8 Aspheric -12.0547 D2 0 S9 Aspheric -9.4948 0.4000 1.545 56.00 0 S10 Aspheric 6.00074 D3 0 STO spherical surface endless -0.6012 S11 Aspheric 4.3100 2.0000 1.498 81.56 0 S12 Aspheric -12.3899 1.5241 0 S13 Aspheric 20.9513 1.0987 1.670 19.00 0 S14 Aspheric 8.0267 6.4554 0 S15 Aspheric -7.1728 1.7502 1.583 33.36 0 S16 Aspheric -14.9180 1.300 0 S17 spherical surface endless

[0127] Table 1

[0128] In Example 1, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0129]

[0130] Where x is the distance vector from the vertex of the aspheric surface 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 radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspheric surface. Table 2 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspheric mirror surface S1-S16 in Example 1.

[0131]

[0132]

[0133] Table 2

[0134] Some structural parameters of the zoom lens group in different states are shown in Table 3.

[0135] Status / Parameters TTL(mm) f(mm) Semi-FOV(°) FNO D1(mm) D2(mm) D3(mm) Wide-angle end state 27.00 11.00 18.23 2.54 0.5000 0.5079 7.7106 Intermediate status 27.00 15.56 12.48 2.54 2.2747 1.9016 4.5422 Telephoto end state 27.00 21.98 8.72 5.4734 2.7454 0.5000 5.4734

[0136] Table 3

[0137] Figures 4 to 9 The axial chromatic aberration curve and astigmatism curve of the zoom lens assembly of Example 1 in different states are shown. The axial chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the zoom lens assembly. The astigmatism curve represents the meridional image curvature and sagittal image curvature. Figure 4 The axial chromatic aberration curve of the zoom lens group of Example 1 at the wide-angle end state is shown. Figure 5 FIG. 1 shows the astigmatism curve of the zoom lens group of Example 1 at the wide-angle end state. Figure 6 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 1 at the intermediate end state. Figure 7 FIG. 1 shows the astigmatism curve of the zoom lens group of Example 1 at the intermediate end state. Figure 8 The figure shows the axial chromatic aberration curve of the zoom lens assembly of Example 1 at the telephoto end state. Figure 9 FIG. 4 shows the astigmatism curve of the zoom lens assembly of Example 1 at the telephoto end state.

[0138] according to Figures 4 to 9 It can be seen that the zoom lens assembly provided in Example 1 can achieve good imaging quality in different states.

[0139] Example 2

[0140] like Figures 10 to 18 As shown, the zoom lens group of the second embodiment of the present application is described. Figure 10 The diagram shows the structure of the zoom lens assembly in the wide-angle end state according to the second embodiment. Figure 11 A schematic structural diagram of the zoom lens assembly of the second embodiment in an intermediate state is shown. Figure 12 The structure diagram of the zoom lens assembly of the second embodiment in the telephoto end state is shown. For the sake of brevity, some descriptions similar to those of the first embodiment will be omitted.

[0141] like Figures 10 to 12 As shown, the zoom lens group includes, from object side to image side, the following: a first lens group, a second lens group, a third lens group, an aperture stop STO, a fourth lens group, and an imaging surface S17. The first lens group includes a first lens E1 and a second lens E2; the second lens group includes a third lens E3 and a fourth lens E4; the third lens group includes a fifth lens E5; and the fourth lens group includes a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0142] 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 convex. 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 negative 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 positive optical power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex, and its image-side surface S14 being concave. The eighth lens element E8 has positive refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave. Light from the object passes through the surfaces S1 to S16 in sequence and is ultimately imaged on the imaging surface S17.

[0143] Table 4 shows the basic structural parameters of the zoom lens assembly of Example 2, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0144] Face number Face shape Radius of curvature thickness Refractive index Abbe number Cone coefficient OBJ spherical surface endless endless S1 Aspheric -201.2819 0.3285 1.710 29.69 0 S2 Aspheric 15.0135 0.1207 0 S3 Aspheric 13.0510 1.6907 1.545 65.04 0 S4 Aspheric -18.3873 D1 0 S5 Aspheric 33.7963 1.0038 1.673 31.92 0 S6 Aspheric -15.2813 0.3216 0 S7 Aspheric -10.1403 0.2000 1.553 64.42 0 S8 Aspheric -12.1988 D2 0 S9 Aspheric -9.3269 0.5654 1.547 64.90 0 S10 Aspheric 5.9665 D3 0 STO spherical surface endless 0.4107 S11 Aspheric 4.3443 2.6711 1.498 81.56 0 S12 Aspheric -11.8802 1.3628 0 S13 Aspheric 48.6035 1.0178 1.753 27.65 0 S14 Aspheric 7.5906 8.0760 0 S15 Aspheric 5.6639 1.7606 1.523 66.91 0 S16 Aspheric 21.0619 1.0253 0 S17 spherical surface endless

[0145] Table 4

[0146] In the second embodiment, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in the first embodiment.

[0147] Table 5 lists the high-order coefficients of the aspherical mirror surfaces S1-S16 that can be used in the second embodiment.

[0148]

[0149]

[0150] Table 5

[0151] Some structural parameters of the zoom lens group in different states are shown in Table 6.

[0152] Status / Parameters TTL(mm) f(mm) Semi-FOV(°) FNO D1(mm) D2(mm) D3(mm) Wide-angle end state 31.86 8.39 21.24 2.54 0.1650 0.3429 11.2131 Intermediate status 31.86 17.56 9.66 2.54 5.1223 2.5325 4.0000 Telephoto end state 31.86 22.37 7.61 2.87 8.1057 2.7444 0.8059

[0153] Table 6

[0154] Figures 13 to 18 The axial chromatic aberration curves and astigmatism curves of the zoom lens assembly of Example 2 in different states are shown. The axial chromatic aberration curves represent the deviation of the focal point of light of different wavelengths after passing through the zoom lens assembly. The astigmatism curves represent the meridional and sagittal image curvatures. Figure 13 The axial chromatic aberration curve of the zoom lens group of Example 2 at the wide-angle end state is shown. Figure 14 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 2 at the wide-angle end state. Figure 15 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 2 at the intermediate end state. Figure 16 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 2 at the middle end state. Figure 17 The figure shows the axial chromatic aberration curve of the zoom lens assembly of the second embodiment at the telephoto end state. Figure 18 The astigmatism curve of the zoom lens assembly of Example 2 at the telephoto end state is shown.

[0155] according to Figures 13 to 18 It can be seen that the zoom lens assembly provided in the second embodiment can achieve good imaging quality in different states.

[0156] Example 3

[0157] like Figures 19 to 27 As shown, the zoom lens group of embodiment 3 of the present application is described. Figure 19 The diagram shows the structure of the zoom lens assembly in the third embodiment at the wide-angle end state. Figure 20 FIG. 1 shows a schematic structural diagram of the zoom lens assembly of the third embodiment in an intermediate state. Figure 21 The structure diagram of the zoom lens assembly in the telephoto end state of the third embodiment is shown. For the sake of brevity, some descriptions similar to those in the first embodiment will be omitted.

[0158] like Figures 19 to 21As shown, the zoom lens group includes, from object side to image side, the following: a first lens group, a second lens group, a third lens group, an aperture stop STO, a fourth lens group, and an imaging surface S17. The first lens group includes a first lens E1 and a second lens E2; the second lens group includes a third lens E3 and a fourth lens E4; the third lens group includes a fifth lens E5; and the fourth lens group includes a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0159] 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 convex. 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 negative 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 positive optical power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex, and its image-side surface S14 being concave. The eighth lens element E8 has positive refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave. Light from the object passes through the surfaces S1 to S16 in sequence and is ultimately imaged on the imaging surface S17.

[0160] Table 7 shows the basic structural parameters of the zoom lens assembly of Example 3, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0161] Face number Face shape Radius of curvature thickness Refractive index Abbe number Cone coefficient OBJ spherical surface endless endless S1 Aspheric -335.7611 0.4393 1.706 29.88 0 S2 Aspheric 15.3410 0.1046 0 S3 Aspheric 13.2874 1.7140 1.543 65.17 0 S4 Aspheric -20.8314 D1 0 S5 Aspheric 32.8897 1.1419 1.666 32.87 0 S6 Aspheric -13.2758 0.3379 0 S7 Aspheric -9.0526 0.2175 1.579 41.53 0 S8 Aspheric -11.9662 D2 0 S9 Aspheric -9.0060 0.6182 1.552 64.54 0 S10 Aspheric 6.0929 D3 0 STO spherical surface endless 0.0579 S11 Aspheric 4.3424 2.6714 1.498 81.56 0 S12 Aspheric -12.2994 1.3912 0 S13 Aspheric 36.0021 1.0491 1.755 27.58 0 S14 Aspheric 7.4043 8.7510 0 S15 Aspheric 8.8148 1.8254 1.755 27.58 0 S16 Aspheric 9.1383 1.5961 0 S17 spherical surface endless

[0162] Table 7

[0163] In the third embodiment, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in the first embodiment.

[0164] Table 8 shows the high-order coefficients of the aspheric mirror surfaces S1-S16 that can be used in the third embodiment.

[0165]

[0166]

[0167] Table 8

[0168] Some structural parameters of the zoom lens group in different states are shown in Table 9.

[0169] Status / Parameters TTL(mm) f(mm) Semi-FOV(°) FNO D1(mm) D2(mm) D3(mm) Wide-angle end state 32.32 14.33 13.55 2.93 2.0533 1.5248 6.8803 Intermediate status 32.32 19.26 9.99 2.94 4.0944 2.3849 3.9791 Telephoto end state 32.32 25.67 7.50 2.93 6.9943 2.8802 0.5839

[0170] Table 9

[0171] Figures 22 to 27 The axial chromatic aberration curves and astigmatism curves of the zoom lens assembly of Example 3 in different states are shown. The axial chromatic aberration curves represent the deviation of the focal point of light of different wavelengths after passing through the zoom lens assembly. The astigmatism curves represent the meridional and sagittal image curvatures. Figure 22 The axial chromatic aberration curve of the zoom lens group of Example 3 at the wide-angle end state is shown. Figure 23 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 3 at the wide-angle end state. Figure 24 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 3 at the intermediate end state. Figure 25 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 3 at the middle end state. Figure 26 The axial chromatic aberration curve of the zoom lens assembly of Example 3 at the telephoto end state is shown. Figure 27 The astigmatism curve of the zoom lens assembly of Example 3 is shown in the telephoto end state.

[0172] according to Figures 22 to 27 It can be seen that the zoom lens assembly provided in the third embodiment can achieve good imaging quality in different states.

[0173] Example 4

[0174] like Figures 28 to 36 As shown, the zoom lens group of the fourth embodiment of the present application is described. Figure 28 A schematic structural diagram of the zoom lens assembly of the fourth embodiment in the wide-angle end state is shown. Figure 29 A schematic structural diagram of the zoom lens assembly of the fourth embodiment is shown in the middle end state. Figure 30 The structure diagram of the zoom lens assembly of the fourth embodiment in the telephoto end state is shown. For the sake of brevity, some descriptions similar to those of the first embodiment will be omitted.

[0175] like Figures 28 to 30 As shown, the zoom lens group includes, from object side to image side, the following: a first lens group, a second lens group, a third lens group, an aperture stop STO, a fourth lens group, and an imaging surface S17. The first lens group includes a first lens E1 and a second lens E2; the second lens group includes a third lens E3 and a fourth lens E4; the third lens group includes a fifth lens E5; and the fourth lens group includes a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0176] 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 convex. 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 negative 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 positive optical power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex, and its image-side surface S14 being concave. The eighth lens element E8 has positive refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave. Light from the object passes through the surfaces S1 to S16 in sequence and is ultimately imaged on the imaging surface S17.

[0177] Table 10 shows the basic structural parameters of the zoom lens assembly of Example 4, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0178] Face number Face shape Radius of curvature thickness Refractive index Abbe number Cone coefficient OBJ spherical surface endless endless S1 Aspheric -379.2738 0.4968 1.709 29.69 0 S2 Aspheric 16.6213 0.1297 0 S3 Aspheric 14.2583 1.8855 1.536 65.70 0 S4 Aspheric -23.2454 D1 0 S5 Aspheric 36.3549 1.2647 1.676 32.46 0 S6 Aspheric -14.8316 0.3396 0 S7 Aspheric -9.9444 0.2219 1.579 48.27 0 S8 Aspheric -13.0030 D2 0 S9 Aspheric -10.0677 0.7707 1.548 64.84 0 S10 Aspheric 6.6203 D3 0 STO spherical surface endless 0.0000 S11 Aspheric 4.7908 2.8581 1.498 81.56 0 S12 Aspheric -13.5723 1.5045 0 S13 Aspheric 43.7746 1.1503 1.755 27.58 0 S14 Aspheric 7.9643 9.6544 0 S15 Aspheric 9.6634 2.2234 1.746 40.04 0 S16 Aspheric 10.1696 1.9155 0 S17 spherical surface endless

[0179] Table 10

[0180] In the fourth embodiment, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in the first embodiment.

[0181] Table 11 lists the high-order coefficients of the aspheric mirror surfaces S1-S16 that can be used in the fourth embodiment.

[0182]

[0183]

[0184] Table 11

[0185] Some structural parameters of the zoom lens group in different states are shown in Table 12.

[0186] Status / Parameters TTL(mm) f(mm) Semi-FOV(°) FNO D1(mm) D2(mm) D3(mm) Wide-angle end state 37.22 14.21 14.21 2.82 2.0879 1.3485 9.3677 Intermediate status 37.22 21.75 9.12 2.82 5.2407 2.7895 4.7739 Telephoto end state 37.22 29.06 6.83 3.21 8.6476 3.3136 0.8430

[0187] Table 12

[0188] Figures 31 to 36The axial chromatic aberration curves and astigmatism curves of the zoom lens assembly of Example 4 in different states are shown. The axial chromatic aberration curves represent the deviation of the focal point of light of different wavelengths after passing through the zoom lens assembly. The astigmatism curves represent the meridional and sagittal image curvatures. Figure 31 The axial chromatic aberration curve of the zoom lens group of Example 4 at the wide-angle end state is shown. Figure 32 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 4 at the wide-angle end state. Figure 33 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 4 at the intermediate end state. Figure 34 FIG. 1 shows the astigmatism curve of the zoom lens group of Example 4 at the intermediate end state. Figure 35 The axial chromatic aberration curve of the zoom lens group of Example 4 at the telephoto end state is shown. Figure 36 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 4 at the telephoto end state.

[0189] according to Figures 31 to 36 It can be seen that the zoom lens assembly provided in the fourth embodiment can achieve good imaging quality in different states.

[0190] Example 5

[0191] like Figures 37 to 45 As shown, the zoom lens group of the fifth embodiment of the present application is described. Figure 37 FIG. 1 is a schematic structural diagram of the zoom lens assembly of the fifth embodiment in the wide-angle end state. Figure 38 FIG2 shows a schematic structural diagram of the zoom lens assembly of the fifth embodiment in an intermediate state. Figure 39 The structure diagram of the zoom lens assembly of the fifth embodiment in the telephoto end state is shown. For the sake of brevity, some descriptions similar to those of the first embodiment will be omitted.

[0192] like Figures 37 to 39 As shown, the zoom lens group includes, from object side to image side, the following: a first lens group, a second lens group, a third lens group, an aperture stop STO, a fourth lens group, and an imaging surface S17. The first lens group includes a first lens E1 and a second lens E2; the second lens group includes a third lens E3 and a fourth lens E4; the third lens group includes a fifth lens E5; and the fourth lens group includes a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0193] 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 convex. 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 negative 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 positive optical power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex, and its image-side surface S14 being concave. The eighth lens element E8 has positive refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave. Light from the object passes through the surfaces S1 to S16 in sequence and is ultimately imaged on the imaging surface S17.

[0194] Table 13 shows the basic structural parameters of the zoom lens assembly of Example 5, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0195] Face number Face shape Radius of curvature thickness Refractive index Abbe number Cone coefficient OBJ spherical surface endless endless S1 Aspheric -275.7205 0.4945 1.708 30.14 0 S2 Aspheric 16.7639 0.0575 0 S3 Aspheric 13.3870 1.8308 1.531 66.19 0 S4 Aspheric -27.9720 D1 0 S5 Aspheric 37.3879 1.4232 1.698 31.91 0 S6 Aspheric -15.0422 0.3779 0 S7 Aspheric -10.4056 0.2120 1.581 41.31 0 S8 Aspheric -13.7272 D2 0 S9 Aspheric -10.5013 0.7267 1.541 65.35 0 S10 Aspheric 6.9652 D3 0 STO spherical surface endless 0.0000 S11 Aspheric 5.0387 2.8716 1.498 81.56 0 S12 Aspheric -13.8953 1.5406 0 S13 Aspheric 59.1374 1.2011 1.755 27.58 0 S14 Aspheric 8.5801 9.4951 0 S15 Aspheric 9.2960 1.8601 1.751 32.25 0 S16 Aspheric 9.2541 3.0537 0 S17 spherical surface endless

[0196] Table 13

[0197] In the fifth embodiment, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in the first embodiment.

[0198] Table 14 shows the high-order coefficients of the aspheric mirror surfaces S1-S16 that can be used in Example 5.

[0199]

[0200]

[0201] Table 14

[0202] Some structural parameters of the zoom lens group in different states are shown in Table 15.

[0203] Status / Parameters TTL(mm) f(mm) Semi-FOV(°) FNO D1(mm) D2(mm) D3(mm) Wide-angle end state 38.0 16.88 11.85 2.86 2.6779 1.5754 8.6085 Intermediate status 38.0 22.75 8.70 2.86 5.3346 2.5779 4.9493 Telephoto end state 38.0 30.35 6.51 3.30 9.0225 3.1820 0.6573

[0204] Table 15

[0205] Figures 40 to 45The axial chromatic aberration curves and astigmatism curves of the zoom lens assembly of Example 5 in different states are shown. The axial chromatic aberration curves represent the deviation of the focal point of light of different wavelengths after passing through the zoom lens assembly. The astigmatism curves represent the meridional and sagittal image curvatures. Figure 40 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 5 at the wide-angle end state. Figure 41 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 5 at the wide-angle end state. Figure 42 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 5 at the intermediate end state. Figure 43 FIG. 1 shows the astigmatism curve of the zoom lens group of Example 5 at the intermediate end state. Figure 44 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 5 at the telephoto end state. Figure 45 The astigmatism curve of the zoom lens group of Example 5 at the telephoto end state is shown.

[0206] according to Figures 40 to 45 It can be seen that the zoom lens assembly provided in the fifth embodiment can achieve good imaging quality in different states.

[0207] Example 6

[0208] like Figures 46 to 54 As shown, the zoom lens group of embodiment 6 of the present application is described. Figure 46 FIG. 1 is a schematic structural diagram of the zoom lens assembly of Example 6 in the wide-angle end state. Figure 47 FIG. 1 is a schematic structural diagram of the zoom lens assembly of Example 6 in an intermediate end state. Figure 48 FIG2 is a schematic diagram showing the structure of the zoom lens assembly of Example 6 in the telephoto end state. For the sake of brevity, some descriptions similar to those of Example 1 will be omitted.

[0209] like Figures 46 to 48 As shown, the zoom lens group includes, from object side to image side, the following: a first lens group, a second lens group, a third lens group, an aperture stop STO, a fourth lens group, and an imaging surface S17. The first lens group includes a first lens E1 and a second lens E2; the second lens group includes a third lens E3 and a fourth lens E4; the third lens group includes a fifth lens E5; and the fourth lens group includes a sixth lens E6, a seventh lens E7, and an eighth lens E8.

[0210] 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 convex. 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 negative 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 positive optical power, with its object-side surface S11 being convex, and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being convex, and its image-side surface S14 being concave. The eighth lens element E8 has positive refractive power. The object-side surface S15 of the eighth lens element is convex, and the image-side surface S16 of the eighth lens element is concave. Light from the object passes through the surfaces S1 to S16 in sequence and is ultimately imaged on the imaging surface S17.

[0211] Table 16 shows the basic structural parameters of the zoom lens assembly of Example 6, where the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0212] Face number Face shape Radius of curvature thickness Refractive index Abbe number Cone coefficient OBJ spherical surface endless endless S1 Aspheric -371.6883 0.4869 1.710 29.69 0 S2 Aspheric 16.2888 0.1272 0 S3 Aspheric 13.9731 1.8478 1.537 65.70 0 S4 Aspheric -22.7805 D1 0 S5 Aspheric 35.6278 1.2394 1.677 32.46 0 S6 Aspheric -14.5350 0.3328 0 S7 Aspheric -9.7455 0.2174 1.579 48.27 0 S8 Aspheric -12.7430 D2 0 S9 Aspheric -9.8663 0.7553 1.548 64.84 0 S10 Aspheric 6.4879 D3 0 STO spherical surface endless 0.0000 S11 Aspheric 4.6950 2.8010 1.498 81.56 0 S12 Aspheric -13.3008 1.4744 0 S13 Aspheric 42.8991 1.1273 1.755 27.58 0 S14 Aspheric 7.8051 9.4613 0 S15 Aspheric 9.4701 2.1790 1.746 40.04 0 S16 Aspheric 9.9662 1.8772 0 S17 spherical surface endless

[0213] Table 16

[0214] In Example 6, the object-side surface and the image-side surface of any lens from the first lens E1 to the eighth lens E8 are both aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, formula (1) in Example 1.

[0215] Table 17 shows the high-order coefficients of the aspheric mirror surfaces S1-S16 that can be used in Example 6.

[0216]

[0217]

[0218] Table 17

[0219] Some structural parameters of the zoom lens group in different states are shown in Table 18.

[0220] Status / Parameters TTL(mm) f(mm) Semi-FOV(°) FNO D1(mm) D2(mm) D3(mm) Wide-angle end state 36.47 13.92 14.55 2.93 2.0462 1.3215 9.1804 Intermediate status 36.47 21.32 9.33 2.93 5.1359 2.7337 4.6784 Telephoto end state 36.47 28.48 6.99 3.28 8.4746 3.2473 0.8261

[0221] Table 18

[0222] Figures 49 to 54The axial chromatic aberration curves and astigmatism curves of the zoom lens assembly of Example 6 in different states are shown. The axial chromatic aberration curves represent the deviation of the focal point of light of different wavelengths after passing through the zoom lens assembly. The astigmatism curves represent the meridional and sagittal image curvatures. Figure 49 The axial chromatic aberration curve of the zoom lens group of Example 6 at the wide-angle end state is shown. Figure 50 FIG. 1 shows the astigmatism curve of the zoom lens group of Example 6 at the wide-angle end state. Figure 51 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 6 at the intermediate end state. Figure 52 FIG. 1 shows the astigmatism curve of the zoom lens group of Example 6 at the intermediate end state. Figure 53 The figure shows the axial chromatic aberration curve of the zoom lens group of Example 6 at the telephoto end state. Figure 54 FIG. 4 shows the astigmatism curve of the zoom lens group of Example 6 at the telephoto end state.

[0223] according to Figures 49 to 54 It can be seen that the zoom lens assembly provided in Example 6 can achieve good imaging quality in different states.

[0224] In summary, Examples 1 to 6 respectively satisfy the relationships shown in Table 19.

[0225]

[0226]

[0227] Table 19

[0228] Table 20 shows the optical parameters of the zoom lens system of Examples 1 to 6.

[0229] Optical parameters / Examples one two three Four five six f1(mm) -17.86 -19.56 -20.64 -22.29 -22.18 -21.85 f2(mm) 14.19 14.23 15.16 16.71 17.27 16.38 f3(mm) 13.40 15.69 14.26 15.64 15.46 15.32 f4(mm) -61.76 -112.17 -65.68 -74.67 -75.46 -73.18 f5(mm) -6.67 -6.55 -6.47 -7.15 -7.61 -7.01 f6(mm) 6.68 6.75 6.80 7.50 7.82 7.35 f7(mm) -19.92 -11.99 -12.46 -12.99 -13.34 -12.73 f8(mm) -25.73 14.23 95.32 89.89 150.20 88.09 FG2(mm) 17.18 18.26 18.18 19.75 19.38 19.35 FG4(mm) 7.49 11.80 8.84 10.02 10.50 9.82

[0230] Table 20

[0231] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the zoom lens assembly described above.

[0232] Obviously, the embodiments described above 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 efforts should fall within the scope of protection of the present invention.

[0233] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0234] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0235] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A zoom lens assembly, characterized in that: The zoom lens group is composed of four lens groups along the object side to the image side, and the four lens groups are sequentially: a first lens group having positive refractive power, the first lens group consisting of a first lens having negative refractive power and a second lens having positive refractive power, the object-side surface of the first lens being concave, the image-side surface of the first lens being concave, the object-side surface of the second lens being convex, and the image-side surface of the second lens being convex; a second lens group, wherein the second lens group has positive refractive power and is composed of a third lens having positive refractive power and a fourth lens having negative refractive power, the object-side surface of the third lens is convex, the image-side surface of the third lens is convex, the object-side surface of the fourth lens is concave, and the image-side surface of the fourth lens is convex; a third lens group having negative optical power, the third lens group consisting of a fifth lens having negative optical power, the object-side surface of the fifth lens being concave, and the image-side surface of the fifth lens being concave; a fourth lens group having positive refractive power, the fourth lens group consisting of a sixth lens having positive refractive power, a seventh lens having negative refractive power, and an eighth lens having refractive power, the object-side surface of the sixth lens being convex, the image-side surface of the sixth lens being convex, the object-side surface of the seventh lens being convex, and the image-side surface of the seventh lens being concave; The second lens group and the third lens group are moved to change the air interval between any two adjacent lens groups from the first lens group to the fourth lens group on the optical axis of the zoom lens group, so as to achieve zooming of the zoom lens group; A difference Δf between the effective focal length of the zoom lens assembly in the telephoto end state and the effective focal length of the zoom lens assembly in the wide-angle end state satisfies the following: 10.98≤Δf≤14.85; The effective focal length fw of the zoom lens group in the wide-angle end state and the effective focal length f5 of the fifth lens satisfy the following: -2.22≤fw / f5≤-1.28; The effective focal length FG2 of the second lens group and the effective focal length FG4 of the fourth lens group satisfy the following: 1.55≤FG2 / FG4≤2.

29.

2. The zoom lens assembly according to claim 1, wherein: The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, and the effective focal length FG4 of the fourth lens group satisfy the following: 1.13≤(|f5|+f6) / FG4≤1.

78.

3. The zoom lens assembly according to claim 1, wherein: A total length TTL of the zoom lens group and an air distance D1w between the first lens group and the second lens group on the optical axis when the zoom lens group is in the wide-angle end state satisfy the following: 2.84≤TTL / D1w<4.

80.

4. The zoom lens assembly according to claim 1, wherein: The total length TTL of the zoom lens group, the effective focal length ft of the zoom lens group in the telephoto end state, and the aperture number FNOt of the zoom lens group in the telephoto end state satisfy the following relationship: 3.52≤TTL / ft*FNOt≤4.

21.

5. The zoom lens assembly according to claim 1, wherein: The air gap D1t between the first lens group and the second lens group on the optical axis when the zoom lens group is in the telephoto end state, the air gap D1w between the first lens group and the second lens group on the optical axis when the zoom lens group is in the wide-angle end state, and the difference △Semi-FOV between half of the field of view of the zoom lens group in the wide-angle end state and half of the field of view of the zoom lens group in the telephoto end state satisfy the following: 0.32≤D1t / D1w*tan(△Semi-FOV)<12.

00.

6. The zoom lens assembly according to claim 1, wherein: The object side surface of the fourth lens is concave, the image side surface of the fourth lens is convex, and the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -10.85≤(R7+R8) / (R7-R8)≤-6.

80.

7. The zoom lens assembly according to claim 6, wherein: The object-side surface of the fifth lens is concave, the image-side surface of the fifth lens is concave, and the curvature radius R8 of the image-side surface of the fourth lens and the curvature radius R9 of the object-side surface of the fifth lens satisfy the following relationship: 7.08≤(R8+R9) / (R8-R9)<8.

50.

8. The zoom lens assembly according to claim 1, wherein: The center thickness CT6 of the sixth lens, the center thickness CT7 of the seventh lens, and the center thickness CT8 of the eighth lens satisfy the following: 0.70≤CT6 / (CT7+CT8)<1.

00.

9. The zoom lens assembly according to claim 1, wherein: An air gap T78 between the seventh lens and the eighth lens on the optical axis, a center thickness CT6 of the sixth lens, a center thickness CT7 of the seventh lens, a center thickness CT8 of the eighth lens, and an air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy the following: 1.01≤T78 / (CT6+T67+CT7+CT8)≤1.

27.

10. The zoom lens assembly according to claim 1, wherein: An effective focal length f5 of the fifth lens, a curvature radius R9 of the object-side surface of the fifth lens, and a curvature radius R10 of the image-side surface of the fifth lens satisfy the following relationship: 1.91≤f5 / (R9+R10)≤2.

22.

11. The zoom lens assembly according to claim 1, wherein: A difference ΔSemi-FOV between half of the field of view angle of the zoom lens group in the wide-angle end state and half of the field of view angle of the zoom lens group in the telephoto end state satisfies the following: 5.34≤ΔSemi-FOV<13.

70.

12. The zoom lens assembly according to claim 1, wherein: The effective focal length fw of the zoom lens group in the wide-angle end state and half of the field of view Semi-FOVw of the zoom lens group in the wide-angle end state satisfy the following: 3.26≤fw*tan(Semi-FOVw)≤3.

62.

13. The zoom lens assembly according to claim 1, wherein: The edge thickness ET1 of the first lens at the maximum effective semi-aperture, the center thickness CT1 of the first lens, and the refractive index N1 of the first lens satisfy the following relationship: 3.76≤ET1 / CT1*N1≤4.

88.

14. The zoom lens assembly according to claim 1, wherein: A curvature radius R14 of the image-side surface of the seventh lens, a curvature radius R15 of the object-side surface of the eighth lens, and an air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy the following relationship: 0.13≤(R14+R15) / T78≤1.

88.

15. The zoom lens assembly according to claim 1, wherein: The effective focal length FG4 of the fourth lens group, the effective focal length ft of the zoom lens group in the telephoto end state, the sum of the center thicknesses ∑CT of all lenses in the zoom lens group, and the center thickness CT6 of the sixth lens satisfy the following: 3.97≤FG4 / ft+∑CT / CT6≤4.

66.

16. The zoom lens assembly according to claim 1, wherein: The center thickness CT3 of the third lens, the air gap T34 between the third lens and the fourth lens on the optical axis, and the center thickness CT4 of the fourth lens satisfy the following: 1.53≤CT3 / (T34+CT4)<2.

50.

17. The zoom lens assembly according to claim 1, wherein: The maximum effective semi-aperture DT42 of the image side surface of the fourth lens, the maximum effective semi-aperture DT52 of the image side surface of the fifth lens, the maximum effective semi-aperture DT22 of the image side surface of the second lens, and the maximum effective semi-aperture DT32 of the image side surface of the third lens satisfy the following: 0.99≤(DT42-DT52) / (DT22-DT32)≤1.

34.

18. The zoom lens assembly according to claim 1, wherein: The on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the effective half-aperture vertex of the image side surface of the second lens, the on-axis distance SAG21 from the intersection of the object side surface of the second lens and the optical axis to the effective half-aperture vertex of the object side surface of the second lens, and the on-axis distance SAG31 from the intersection of the object side surface of the third lens and the optical axis to the effective half-aperture vertex of the object side surface of the third lens satisfy the following conditions: -0.70 <SAG22 / (SAG21+SAG31)≤-0.35。 19. The zoom lens assembly according to claim 1, wherein: The air gap T34 between the third lens and the fourth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap between the second lens group and the third lens group on the optical axis when the zoom lens group is in the wide-angle end state, and the difference △D2 between the air gap between the second lens group and the third lens group on the optical axis when the zoom lens group is in the wide-angle end state satisfy the following: 3.50<(T34+T56) / △D2≤5.

59.

20. The zoom lens assembly according to any one of claims 1 to 19, wherein: The total length of the zoom lens group remains unchanged in TTL.

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