Zoom lens

Abstract

Embodiments of the present application disclose a zoom lens, which comprises, in order from the object side to the image side along the optical axis, a first lens group, a second lens group, a third lens group and a fourth lens group, the four lens groups comprising nine lenses in order from the object side to the image side along the optical axis, at least one surface of the ninth lens having an inflection point. The zoom lens is switched between a first state and a second state by changing at least the positions of the second lens group and the third lens group along the optical axis. During the switching of the zoom lens between the first state and the second state, half of the maximum field of view angle Semi-FOV of the zoom lens satisfies: 9.0°<Semi-FOV<18.5°; and the zoom lens satisfies: -2.2<f t / f7<‑1.3, -11.8<f w / (FG1+FG4)<‑1.8, where f7 is the effective focal length of the seventh lens; f t is the effective focal length of the zoom lens in the first state; f w is the effective focal length of the zoom lens in the second state; FG1 is the effective focal length of the first lens group; and FG4 is the effective focal length of the fourth lens group.

Description

Technical Field

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

[0002] In recent years, the technology of optical lenses has developed rapidly, and the lenses of portable electronic devices such as mobile phones have also been quickly updated and evolved. The lenses of these portable electronic devices such as mobile phones are applied in more and more fields, for example, video conferencing, online teaching, network video shooting, etc. The telephoto lens with a zoom function has become a major highlight of the current mobile phone lens technology because it can more realistically restore the details of the shooting object in different scenarios.

[0003] However, the existing telephoto lenses with a zoom function still have many deficiencies. For example, these lenses may not be able to achieve a good imaging range at both the telephoto end and the wide-angle end, and cannot balance the system aberration well and achieve a high imaging quality. Especially for a nine-piece zoom lens, how to ensure the imaging effect and achieve a large optical zoom during the moving zoom process is a challenge encountered in the current research and development. Summary of the Invention

[0004] This application provides a zoom lens on the one hand. The zoom lens sequentially includes, along the optical axis from the object side to the image side: a first lens group with a negative optical power, which includes a first lens with a positive optical power and a second lens with a negative optical power; a second lens group with a positive optical power, which includes a third lens with a positive optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power; a third lens group with a negative optical power, which includes a sixth lens with an optical power and a seventh lens with a negative optical power; a fourth lens group with a positive optical power, which includes an eighth lens with a positive optical power and a ninth lens with a negative optical power, and at least one surface of the ninth lens has an inflection point; wherein, the zoom lens switches between a first state and a second state by the following means, that is, by at least changing the positions of the second lens group and the third lens group along the optical axis; wherein, during the process of the zoom lens switching between the first state and the second state, half of the maximum field angle of view Semi-FOV of the zoom lens satisfies 9.0° < Semi-FOV < 18.5°; and wherein, the zoom lens satisfies: -2.2 < f t / f7 < -1.3, and -11.8 < f w / (FG1 + FG4) < -1.8, where f7 is the effective focal length of the seventh lens; f t is the effective focal length of the zoom lens in the first state; f w is the effective focal length of the zoom lens in the second state; FG1 is the effective focal length of the first lens group; FG4 is the effective focal length of the fourth lens group.

[0005] The zoom lens according to the embodiments of this application adopts a nine-element architecture, with the nine lenses divided into four lens groups. The first lens group is a fixed group, while the second, third, and fourth lens groups are zoom groups. By adjusting the positions of at least the second and third lens groups relative to the imaging plane, high-magnification optical zoom can be achieved. By rationally allocating the optical power of the first and fourth lens groups, rationally controlling the effective focal length of the zoom lens in the first and second states, and rationally controlling the range of the lens's field of view during zooming, the lens can achieve a good imaging range in both the first and second states, effectively balancing system aberrations and ensuring image quality. Simultaneously, controlling the lens focal length effectively reduces lens sensitivity, significantly reducing the difficulty of lens assembly and further improving the quality of the produced zoom lenses.

[0006] This application also provides a zoom lens, which comprises, along the optical axis from the object side to the image side, sequentially: a first lens group with negative optical power, a second lens group with positive optical power, a third lens group with negative optical power, and a fourth lens group with positive optical power; wherein the first lens group consists of a first lens and a second lens, the second lens group consists of a third lens, a fourth lens, and a fifth lens, the third lens group consists of a sixth lens and a seventh lens, and the fourth lens group consists of an eighth lens and a ninth lens. The zoom lens switches between a first state and a second state by changing at least the positions of the second and third lens groups along the optical axis. The zoom lens satisfies: 1.9 <TTL w / (f t -f w )<2.2, where TTL w When the zoom lens is in its second state, the distance along the optical axis from the object-side surface of the first lens to the image plane is f. t It is the effective focal length of the zoom lens in its first state, and f w It is the effective focal length of the zoom lens in its second state.

[0007] In another aspect of the present application, a zoom lens is provided. The zoom lens sequentially includes, from the object side to the image side along the optical axis: a first lens group with a negative optical power, a second lens group with a positive optical power, a third lens group with a negative optical power, and a fourth lens group with a positive optical power. Among them, the first lens group consists of a first lens and a second lens, the second lens group consists of a third lens, a fourth lens, and a fifth lens, the third lens group consists of a sixth lens and a seventh lens, and the fourth lens group consists of an eighth lens and a ninth lens. The zoom lens switches between the first state and the second state by at least changing the positions of the second lens group and the third lens group along the optical axis. During the process of the zoom lens switching between the first state and the second state, half of the maximum field angle of view Semi-FOV of the zoom lens satisfies 9.0° < Semi-FOV < 18.5°. The zoom lens also satisfies: 5.6 < f t / Imgh t <6.0, where f t is the effective focal length of the zoom lens in the first state, and Imgh t is half of the diagonal length of the effective pixel area of the zoom lens in the first state.

[0008] In an exemplary embodiment, the zoom lens satisfies: 1.9 < TTL w / (f t - f w ) < 2.2, where TTL w is the distance along the optical axis from the object side surface of the first lens to the imaging surface when the zoom lens is in the second state, f t is the effective focal length of the zoom lens in the first state, and f w is the effective focal length of the zoom lens in the second state.

[0009] In an exemplary embodiment, the zoom lens satisfies: -1.6 < FG3 / FG2 < -1.1, where FG3 is the effective focal length of the third lens group and FG2 is the effective focal length of the second lens group.

[0010] In an exemplary embodiment, the zoom lens satisfies: 1.7 < FG1 / FG3 < 2.5, where FG1 is the effective focal length of the first lens group and FG3 is the effective focal length of the third lens group.

[0011] In an exemplary embodiment, the zoom lens satisfies: -1.5 < FG1 / FG4 < -0.9, where FG3 is the effective focal length of the third lens group and FG4 is the effective focal length of the fourth lens group.

[0012] In an exemplary embodiment, the zoom lens satisfies: 2.0 < (R3 - R4) / (R3 + R4) < 4.5, where R3 is the radius of curvature of the object side surface of the second lens and R4 is the radius of curvature of the image side surface of the second lens.

[0013] In an exemplary embodiment, the zoom lens satisfies: 5.6 < f t / Imgh t < 6.0, where f t is the effective focal length of the zoom lens in the first state, and Imgh t is half of the diagonal length of the effective pixel area of the zoom lens in the first state.

[0014] In an exemplary embodiment, the zoom lens satisfies: 59.2 ≤ TD t / (DT92 - DT12) < 81, where TD t is the distance along the optical axis from the object side surface of the first lens to the image side surface of the ninth lens when the zoom lens is in the first state, DT92 is the effective semi-aperture of the image side surface of the ninth lens, and DT12 is the effective semi-aperture of the image side surface of the first lens.

[0015] In an exemplary embodiment, the zoom lens satisfies: 0.6 < FG4 / f t < 1.4, where FG4 is the effective focal length of the fourth lens group and f t is the effective focal length of the zoom lens in the first state.

[0016] In an exemplary embodiment, the zoom lens satisfies: 3.0 < f3 / R5 + f4 / R7 < 3.8, where f3 is the effective focal length of the third lens, R5 is the radius of curvature of the object side surface of the third lens, f4 is the effective focal length of the fourth lens, and R7 is the radius of curvature of the object side surface of the fourth lens.

[0017] In an exemplary embodiment, the zoom lens satisfies: 12.0 < V2 / N2 < 55, 12.0 < V3 / N3 < 55, 12.0 < V4 / N4 < 55, 12.0 < V5 / N5 < 55, 12.0 < V6 / N6 < 55, 12.0 < V7 / N7 < 55, and 12.0 < V8 / N8 < 55, where V2 is the Abbe number of the second lens, N2 is the refractive index of the second lens, V3 is the Abbe number of the third lens, N3 is the refractive index of the third lens, V4 is the Abbe number of the second lens, N4 is the refractive index of the fourth lens, V5 is the Abbe number of the fifth lens, N5 is the refractive index of the fifth lens, V6 is the Abbe number of the sixth lens, N6 is the refractive index of the sixth lens, V7 is the Abbe number of the seventh lens, N7 is the refractive index of the seventh lens, V8 is the Abbe number of the eighth lens, and N8 is the refractive index of the eighth lens.

[0018] In an exemplary embodiment, the zoom lens satisfies: 0.1 < Dr1r4 / △T23 < 0.5, where Dr1r4 is the distance along the optical axis from the object side surface of the first lens to the image side surface of the second lens, and △T23 is the change value of the distance T23 along the optical axis between the second lens and the third lens in the first state t and the distance T23 along the optical axis between the second lens and the third lens in the second state w i.e., △T23 = |T23 t - T23 w |.

[0019] In an exemplary embodiment, the zoom lens satisfies: 0.4 < Dr11r14 / △T78 < 0.9, where Dr11r14 is the distance along the optical axis from the object side surface of the sixth lens to the image side surface of the seventh lens, and △T78 is the change value of the distance T78 along the optical axis between the seventh lens and the eighth lens in the first state t and the distance T78 along the optical axis between the seventh lens and the eighth lens in the second state w i.e., △T78 = |T78 t - T78 w |.

[0020] In an exemplary embodiment, the zoom lens satisfies: 0.7 < f3 / f8 < 1.4, where f3 is the effective focal length of the third lens and f8 is the effective focal length of the eighth lens.

[0021] In an exemplary embodiment, the zoom lens satisfies: 0.6 < (R11 + R12) / (R13 + R14) < 2.2, where R11 is the curvature radius of the object side surface of the sixth lens, R12 is the curvature radius of the image side surface of the sixth lens, R13 is the curvature radius of the object side surface of the seventh lens, and R14 is the curvature radius of the image side surface of the seventh lens.

[0022] In an exemplary embodiment, the zoom lens satisfies: -2.4 < f9 / (R17 + R18) < -0.6, where f9 is the effective focal length of the ninth lens, R17 is the curvature radius of the object side surface of the ninth lens, and R18 is the curvature radius of the image side surface of the ninth lens.

[0023] In an exemplary embodiment, the zoom lens satisfies: 0.4 < (CT1 + CT2) / (CT6 + CT7) < ...........1.2, where CT1 is the central thickness of the first lens along the optical axis, CT2 is the central thickness of the second lens along the optical axis, CT6 is the central thickness of the sixth lens along the optical axis, and CT7 is the central thickness of the seventh lens along the optical axis.

[0024] Note: There seems to be an ellipsis in the original text at the end of . I've translated it as "..........." in the English version to maintain the integrity of the original text structure. If this is not what you intended, please provide more context or clarify the issue.In an exemplary embodiment, the zoom lens satisfies: 3.2 < ∑AT / T67 < 5.2, where ∑AT is the sum of the distances along the optical axis between any two adjacent lenses among the first lens to the ninth lens when the zoom lens is in the second state, and T67 is the distance along the optical axis between the sixth lens and the seventh lens.

[0025] In an exemplary embodiment, the zoom lens satisfies: 1.6 < SAG71 / SAG72 < 2.4, where SAG71 is the distance along the optical axis from the intersection of the object side surface of the seventh lens with the optical axis to the vertex of the maximum effective semi-aperture of the object side surface of the seventh lens, and SAG72 is the distance along the optical axis from the intersection of the image side surface of the seventh lens with the optical axis to the vertex of the maximum effective semi-aperture of the image side surface of the seventh lens.

[0026] In an exemplary embodiment, the zoom lens satisfies: 1.7 < T78 / T67 < 2.7, where T78 is the distance along the optical axis between the seventh lens and the eighth lens when the zoom lens is in the first state, and T67 is the distance along the optical axis between the sixth lens and the seventh lens.

[0027] In an exemplary embodiment, the zoom lens satisfies: 1.0 ≤ N4 / N3 < 1.2, 1.0 ≤ N5 / N3 < 1.2, where N4 is the refractive index of the fourth lens, N5 is the refractive index of the fifth lens, and N3 is the refractive index of the third lens.

[0028] In an exemplary embodiment, by changing the positions of the second lens group, the third lens group, and the fourth lens group along the optical axis, the zoom lens is switched between the first state and the second state. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In combination with the accompanying drawings, through the detailed description of the following embodiments, other features, objects, and advantages of the present application will become more obvious. In the drawings:

[0030] Figure 1 、 Figure 2 and Figure 3 are respectively schematic structural diagrams of the zoom lens according to Embodiment 1 of the present application in the wide-angle end state, the middle-end state, and the telephoto end state;

[0031] Figure 4A 、 Figure 4B 、 Figure 4C and Figure 4D are respectively the axial chromatic aberration curve diagram, the astigmatism curve diagram, the distortion curve diagram, and the lateral chromatic aberration curve diagram of the zoom lens according to Embodiment 1 of the present application in the wide-angle end state;

[0032] Figure 5A 、 Figure 5B 、 Figure 5C and Figure 5DThese are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens in the telephoto end state according to Embodiment 1 of this application;

[0033] Figure 6 , Figure 7 and Figure 8 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 2 of this application.

[0034] Figure 9A , Figure 9B , Figure 9C and Figure 9D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state according to Embodiment 2 of this application;

[0035] Figure 10A , Figure 10B , Figure 10C and Figure 10D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens in the telephoto end state according to Embodiment 2 of this application;

[0036] Figure 11 , Figure 12 and Figure 13 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 3 of this application.

[0037] Figure 14A , Figure 14B , Figure 14C and Figure 14D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state according to Embodiment 3 of this application;

[0038] Figure 15A , Figure 15B , Figure 15C and Figure 15D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens in the telephoto end state according to Embodiment 3 of this application;

[0039] Figure 16 , Figure 17 and Figure 18 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 4 of this application.

[0040] Figure 19A , Figure 19B , Figure 19C and Figure 19DThese are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state according to Embodiment 4 of this application;

[0041] Figure 20A , Figure 20B , Figure 20C and Figure 20D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end state according to Embodiment 4 of this application;

[0042] Figure 21 , Figure 22 and Figure 23 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 5 of this application.

[0043] Figure 24A , Figure 24B , Figure 24C and Figure 24D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state according to Embodiment 5 of this application;

[0044] Figure 25A , Figure 25B , Figure 25C and Figure 25D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end state according to Embodiment 5 of this application;

[0045] Figure 26 , Figure 27 and Figure 28 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 6 of this application.

[0046] Figure 29A , Figure 29B , Figure 29C and Figure 29D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state according to Embodiment 6 of this application;

[0047] Figure 30A , Figure 30B , Figure 30C and Figure 30D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end state according to Embodiment 6 of this application;

[0048] Figure 31 , Figure 32 and Figure 33 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 7 of this application.

[0049] Figure 34A , Figure 34B , Figure 34C and Figure 34D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state according to Embodiment 7 of this application;

[0050] Figure 35A , Figure 35B , Figure 35C and Figure 35D These are, respectively, the on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end state according to Embodiment 7 of this application;

[0051] Figure 36A This is a schematic diagram of the effective half-aperture of the image-side surface of the first lens according to an embodiment of this application;

[0052] Figure 36B This is a schematic diagram of the effective half-aperture of the image side of the ninth lens according to an embodiment of this application;

[0053] Figure 36C This is a schematic diagram showing the distance along the optical axis from the intersection of the object-side surface of the seventh lens and the optical axis to the vertex of the maximum effective half-aperture of the object-side surface of the seventh lens, and the distance along the optical axis from the intersection of the image-side surface of the seventh lens and the optical axis to the vertex of the maximum effective half-aperture of the image-side surface of the seventh lens. Detailed Implementation

[0054] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0055] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0056] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0057] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging side is called the image-side surface of the lens.

[0058] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0059] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0061] The features, principles and other aspects of this application are described in detail below.

[0062] In an exemplary embodiment, the zoom lens may include four lens groups with optical power arranged sequentially along the optical axis from the object side to the image side, namely a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group consists of a first lens and a second lens, the second lens group consists of a third lens, a fourth lens, and a fifth lens, the third lens group consists of a sixth lens and a seventh lens, and the fourth lens group consists of an eighth lens and a ninth lens.

[0063] In an exemplary embodiment, the first lens group may be a fixed group with negative optical power; the second lens group may be a zoom group with positive optical power; the third lens group may be a zoom group with negative optical power; and the fourth lens group may have positive optical power.

[0064] In an exemplary embodiment, the first lens may have positive optical power; the second lens may have negative optical power; the third lens may have positive optical power; the fourth lens may have positive optical power; the fifth lens may have negative optical power; the sixth lens may have optical power; the seventh lens may have negative optical power; the eighth lens may have positive optical power; and the ninth lens may have negative optical power. In an exemplary embodiment, at least one surface of the ninth lens has a curvature point.

[0065] In an exemplary embodiment, the zoom lens according to the embodiments of this application can switch between a first state (the first state may be, for example, a telephoto end state) and a second state (the second state may be, for example, a wide-angle end state) by changing at least the positions of the second and third lens groups along the optical axis, that is, by changing the air gaps along the optical axis of the first and second lens groups, the second and third lens groups, and the third and fourth lens groups. In an exemplary embodiment, the zoom lens according to the embodiments of this application can also switch between a first state and a second state by changing the positions of the second, third, and fourth lens groups along the optical axis, that is, by changing the air gap from the fourth lens group to the imaging plane along the optical axis.

[0066] In this application, by using four zoom lens groups, including nine lenses, in conjunction with movable zoom, a high magnification optical zoom can be achieved. Furthermore, this combination simultaneously satisfies the requirements of long focal length and large image size, resulting in excellent overall performance of the zoom lens.

[0067] In an exemplary embodiment, the zoom lens according to an embodiment of this application may further include an aperture stop. In an exemplary embodiment, the aperture stop may be disposed between the fourth lens and the fifth lens.

[0068] In an exemplary embodiment, during the process of the zoom lens according to an embodiment of the present application switching between the first state and the second state, the half Semi-FOV of the maximum field of view angle of the zoom lens can satisfy: 9.0° < Semi-FOV < 18.5°. By making the zoom lens according to an embodiment of the present application satisfy the above conditional formula, the field of view angle of the lens can be controlled, so that the zoom lens can achieve a good imaging range in both the first state and the second state, and can well balance the system aberration, thereby ensuring that the zoom lens has excellent quality.

[0069] In an exemplary embodiment, the zoom lens according to an embodiment of the present application can satisfy: -2.2 < f t / f7 < -1.3. Where f7 is the effective focal length of the seventh lens; f t is the effective focal length of the zoom lens in the first state. By making the zoom lens according to an embodiment of the present application satisfy the above conditional formula, the sensitivity of the lens can be effectively reduced, the difficulty of assembling the lens sheets is greatly reduced, and thus it is convenient to further improve the quality of the produced zoom lens.

[0070] In an exemplary embodiment, the zoom lens according to an embodiment of the present application can satisfy: -11.8 < f w / (FG1 + FG4) < -1.8. Where f w is the effective focal length of the zoom lens in the second state; FG1 is the effective focal length of the first lens group; FG4 is the effective focal length of the fourth lens group. By making the zoom lens according to an embodiment of the present application satisfy the above conditional formula, the optical power of the lens group can be reasonably distributed, so that the zoom lens can achieve a good imaging range in both the second state and the first state, and can well balance the system aberration, thereby ensuring that the zoom lens has excellent quality. At the same time, the sensitivity of the lens of the zoom lens can also be reduced.

[0071] In an exemplary embodiment, the zoom lens according to an embodiment of the present application can satisfy: 1.9 < TTL w / (f t - f w ) < 2.2. Where TTL w is the distance along the optical axis from the object side surface of the first lens to the imaging surface when the zoom lens is in the second state; f t is the effective focal length of the zoom lens in the first state; f w is the effective focal length of the zoom lens in the second state. By restricting the ratio of the distance along the optical axis from the object side surface of the first lens to the imaging surface to the focal length when the zoom lens is in the second state, a large range of optical zoom can be achieved, and the movement stroke of the movable lens group in the lens can also be restricted within a certain range, making the zoom lens according to an embodiment of the present application more competitive in the market. And satisfy 1.9 < TTLw / (f t -f w ) A zoom lens with a zoom ratio of <2.2 is also beneficial for maintaining a short overall optical length while achieving multiple zooms, thereby effectively controlling the volume of the entire lens and still having a good imaging range while ensuring a small volume of the zoom lens.

[0072] In an exemplary embodiment, the zoom lens according to the embodiment of the present application can satisfy: -1.6 < FG3 / FG2 < -1.1. Where FG3 is the effective focal length of the third lens group; FG2 is the effective focal length of the second lens group. By controlling the ratio of the effective focal lengths of the third lens group and the second lens group within this range, the travel of the second lens group and the third lens group during moving zoom can be effectively controlled to avoid excessive travel, resulting in the problem of lens interference during the moving zoom of the front and rear lens groups.

[0073] In an exemplary embodiment, the zoom lens according to the embodiment of the present application can satisfy: 1.7 < FG1 / FG3 < 2.5. Where FG1 is the effective focal length of the first lens group; FG3 is the effective focal length of the third lens group. By controlling the ratio of the effective focal lengths of the first lens group and the third lens group within this range, the distribution of the optical power of these two lens groups in the optical system of the zoom lens can be better allocated, thereby effectively balancing the aberrations of the zoom lens in different states of the first state and the second state, which is beneficial to improving the resolution of the optical system of the zoom lens.

[0074] In an exemplary embodiment, the zoom lens according to the embodiment of the present application can satisfy: -1.5 < FG1 / FG4 < -0.9. Where FG3 is the effective focal length of the third lens group; FG4 is the effective focal length of the fourth lens group. By controlling the ratio of the effective focal lengths of the third lens group and the fourth lens group within this range, the spherical aberration of the entire zoom lens can be effectively adjusted, ensuring that the zoom lens can achieve a high imaging effect in different focal length states.

[0075] In an exemplary embodiment, the zoom lens according to the embodiment of the present application can satisfy: 2.0 < (R3 - R4) / (R3 + R4) < 4.5. Where R3 is the curvature radius of the object side of the second lens; R4 is the curvature radius of the image side of the second lens. By making the zoom lens according to the embodiment of the present application satisfy the above conditional formula, the shape of the second lens can be effectively controlled, thereby effectively reducing the processing difficulty of the second lens.

[0076] In an exemplary embodiment, the zoom lens according to the embodiment of the present application can satisfy: 5.6 < f t / Imgh t <6.0. Where f tis the effective focal length of the zoom lens in the first state; Imgh t is half of the diagonal length of the effective pixel area of the zoom lens in the first state. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, it can be ensured that while the zoom lens provided by the embodiments of the present application has a reasonable image plane, it can also have a good imaging range and can obtain better lens detail performance capabilities.

[0077] In an exemplary embodiment, the zoom lens according to the embodiments of the present application can satisfy: 59.2 ≤ TD t / (DT92 - DT12) < 81. Where, TD t is the distance along the optical axis from the object side of the first lens to the image side of the ninth lens when the zoom lens is in the first state; DT92 is the effective semi-aperture of the image side of the ninth lens; DT12 is the effective semi-aperture of the image side of the first lens. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the optical apertures of the first lens and the ninth lens can be reasonably distributed, which is beneficial to the compactness of the optical structure, and can ensure that the size of the lens system and the difference between the front and rear port apertures are not too large.

[0078] In an exemplary embodiment, the zoom lens according to the embodiments of the present application can satisfy: 0.6 < FG4 / f t < 1.4. Where, FG4 is the effective focal length of the fourth lens group; f t is the effective focal length of the zoom lens in the first state. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the effective focal length of the fourth lens group can be effectively controlled, thereby being able to reduce the aberration of the marginal field of view.

[0079] In an exemplary embodiment, the zoom lens according to the embodiments of the present application can satisfy: 3.0 < f3 / R5 + f4 / R7 < 3.8. Where, f3 is the effective focal length of the third lens, R5 is the curvature radius of the object side of the third lens, f4 is the effective focal length of the fourth lens, and R7 is the curvature radius of the object side of the fourth lens. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the light deflection angles of the light in the inner field of view at the third lens and the fourth lens can be effectively controlled, so as to play a better role in converging the light, thereby being able to reduce the height of the entire lens, and at the same time, it can also ensure that the third lens and the fourth lens have good manufacturability.

[0080] In an exemplary embodiment, the zoom lens according to an embodiment of the present application may satisfy: 12.0 < V1 / N1 < 55, 12.0 < V3 / N3 < 55, 12.0 < V4 / N4 < 55, 12.0 < V5 / N5 < 55, 12.0 < V6 / N6 < 55, 12.0 < V7 / N7 < 55, and 12.0 < V8 / N8 < 55. Wherein, V1 is the Abbe number of the first lens, N1 is the refractive index of the first lens, V2 is the Abbe number of the second lens, N2 is the refractive index of the second lens, V3 is the Abbe number of the third lens, N3 is the refractive index of the third lens, V4 is the Abbe number of the second lens, N4 is the refractive index of the fourth lens, V5 is the Abbe number of the fifth lens, N5 is the refractive index of the fifth lens, V6 is the Abbe number of the sixth lens, N6 is the refractive index of the sixth lens, V7 is the Abbe number of the seventh lens, N7 is the refractive index of the seventh lens, V8 is the Abbe number of the eighth lens, and N8 is the refractive index of the eighth lens. By making the zoom lens according to an embodiment of the present application satisfy the above conditional expressions simultaneously, while ensuring a good imaging effect of the imaging lens group, the optical system of the zoom lens has a small chromatic aberration.

[0081] In an exemplary embodiment, the zoom lens according to an embodiment of the present application may satisfy: 0.1 < Dr1r4 / △T23 < 0.5. Wherein, Dr1r4 is the distance along the optical axis from the object side surface of the first lens to the image side surface of the second lens; △T23 is the change value of the distance T23 along the optical axis between the second lens and the third lens in the first state t (The distance may be, for example, an air gap) and the distance T23 along the optical axis between the second lens and the third lens in the second state W That is, △T23 = |T23 t - T23 w |. By making the zoom lens according to an embodiment of the present application satisfy the above conditional expression, the relative positions of the second lens group and the first lens group during the zooming process can be effectively controlled, preventing interference between the lenses during the moving zoom process, and at the same time, the difficulty of assembling the zoom lens can be effectively reduced.

[0082] In an exemplary embodiment, the zoom lens according to an embodiment of the present application may satisfy: 0.4 < Dr11r14 / △T78. Wherein, Dr11r14 is the distance along the optical axis from the object side surface of the sixth lens to the image side surface of the seventh lens; △T78 is the change value of the distance T78 along the optical axis between the seventh lens and the eighth lens in the first state t and the distance T78 along the optical axis between the second lens and the third lens in the second state W That is, △T78 = |T78 t - T78 w|. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the relative positions of the sixth lens and the seventh lens in the optical system of the entire zoom lens can be reasonably controlled, and the ability of the optical system of the zoom lens to correct field curvature and astigmatism during zooming can be effectively improved.

[0083] In an exemplary embodiment, the zoom lens according to the embodiments of the present application can satisfy: 0.7 < f3 / f8 < 1.4. Wherein, f3 is the effective focal length of the third lens; f8 is the effective focal length of the eighth lens. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the aberration of the entire zoom lens can be effectively balanced, and thus the resolution of the optical system of the zoom lens can be improved.

[0084] In an exemplary embodiment, the zoom lens according to the embodiments of the present application can satisfy: 0.6 < (R11 + R12) / (R13 + R14) < 2.2. Wherein, R11 is the radius of curvature of the object side surface of the sixth lens; R12 is the radius of curvature of the image side surface of the sixth lens; R13 is the radius of curvature of the object side surface of the seventh lens; R14 is the radius of curvature of the image side surface of the seventh lens. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the sixth lens and the seventh lens can be effectively prevented from being too curved, the processing difficulty of the lens can be reduced, and at the same time, the stability of assembling these two lenses can be improved.

[0085] In an exemplary embodiment, the zoom lens according to the embodiments of the present application can satisfy: -2.4 < f9 / (R17 + R18) < -0.6. Wherein, f9 is the effective focal length of the ninth lens; R17 is the radius of curvature of the object side surface of the ninth lens; R18 is the radius of curvature of the image side surface of the ninth lens. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the field curvature of the optical system of the entire zoom lens can be effectively adjusted, and thus better imaging quality can be obtained while reducing the processing difficulty of the ninth lens.

[0086] In an exemplary embodiment, the zoom lens according to the embodiments of the present application can satisfy: 0.4 < (CT1 + CT2) / (CT6 + CT7) < 1.2. Wherein, CT1 is the central thickness of the first lens along the optical axis; CT2 is the central thickness of the second lens along the optical axis; CT6 is the central thickness of the sixth lens along the optical axis; CT7 is the central thickness of the seventh lens along the optical axis. By making the zoom lens according to the embodiments of the present application satisfy the above conditional formula, the central thickness of the lens along the optical axis can be effectively controlled, and thus the size of the zoom lens can be effectively reduced, and the volume of the zoom lens can be prevented from being too large. At the same time, a high space utilization rate can also be achieved.

[0087] In an exemplary embodiment, the zoom lens according to an embodiment of the present application may satisfy: 3.2 < ∑AT / T67 < 5.2. Wherein, ∑AT is the sum of the distances along the optical axis between any two adjacent lenses from the first lens to the ninth lens when the zoom lens is in the second state; T67 is the distance along the optical axis between the sixth lens and the seventh lens. By making the zoom lens according to an embodiment of the present application satisfy the above conditional formula, the distances of the zoom lens in the second state can be reasonably allocated, ensuring the processing and assembly characteristics of the zoom lens, and avoiding the interference of the front and rear lenses during the assembly process due to too small distances; at the same time, it is also beneficial to reduce the deflection angle of light, reduce the sensitivity of the entire optical system of the zoom lens, and thus obtain higher imaging quality.

[0088] In an exemplary embodiment, the zoom lens according to an embodiment of the present application may satisfy: 1.6 < SAG71 / SAG72 < 2.4. Wherein, SAG71 is the distance along the optical axis from the intersection of the object side surface of the seventh lens and the optical axis to the vertex of the maximum effective semi-aperture of the object side surface of the seventh lens; SAG72 is the distance along the optical axis from the intersection of the image side surface of the seventh lens and the optical axis to the vertex of the maximum effective semi-aperture of the image side surface of the seventh lens. By making the zoom lens according to an embodiment of the present application satisfy the above conditional formula, the sag heights of the two side surfaces of the seventh lens can be effectively constrained. While facilitating the refraction of the seventh lens, it will not cause the seventh lens to be too curved, which is beneficial to the processing and shaping of the seventh lens.

[0089] In an exemplary embodiment, the zoom lens according to an embodiment of the present application may satisfy: 1.7 < T78 / T67 < 2.7. Wherein, T78 is the distance along the optical axis between the seventh lens and the eighth lens when the zoom lens is in the first state; T67 is the distance along the optical axis between the sixth lens and the seventh lens. By making the zoom lens according to an embodiment of the present application satisfy the above conditional formula, the deflection degree of light and the sensitivity of the optical system of the zoom lens can be reduced, and further the imaging quality of the zoom lens in the first state can be improved.

[0090] In an exemplary embodiment, the zoom lens according to an embodiment of the present application may satisfy: 1.0 ≤ N4 / N3 < 1.2, 1.0 ≤ N5 / N3 < 1.2. Wherein, N4 is the refractive index of the fourth lens; N5 is the refractive index of the fifth lens; N3 is the refractive index of the third lens. By making the zoom lens according to an embodiment of the present application satisfy the above conditional formula, it helps to adjust the principal ray angle of the optical system of the zoom lens, and thus can effectively improve the relative illumination of the optical system of the zoom lens and enhance the clarity of the image plane.

[0091] In the embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the ninth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that its curvature changes continuously from the center to the periphery of the lens. Unlike a spherical lens, which has a constant curvature from the center to the periphery, an aspherical lens has better radius of curvature characteristics, and has the advantages of improving distortion aberrations and astigmatism aberrations. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, at least one of the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses is an aspherical mirror surface. Optionally, both the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are aspherical mirror surfaces.

[0092] However, those skilled in the art will understand that the structure and number of lens groups constituting the lens can be changed without departing from the technical solutions claimed in this application to obtain the various results and advantages described in this specification. For example, although the embodiment is described using four lens groups with a total of nine lenses as an example, the zoom lens is not limited to including these four lens groups / nine lenses. If desired, the zoom lens may also include other numbers of lens groups or lenses. Specific embodiments of zoom lenses applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0093] Example 1

[0094] The following is for reference Figures 1 to 5D A zoom lens according to Embodiment 1 of this application is described. Figure 1 , Figure 2 and Figure 3 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 1 of this application.

[0095] like Figures 1 to 3 As shown, the zoom lens includes, in sequence along the optical axis from the object side to the image side, a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4, and also includes an imaging surface S19 located at the image side end.

[0096] In this embodiment, the first lens group G1 has negative optical power and is a fixed group, including a first lens E1 and a second lens E2 arranged sequentially from the object side to the image side along the optical axis. The first lens E1 has positive optical power, with its object side S1 being convex and its image side S2 being concave; the second lens E2 has negative optical power, with its object side S3 being concave and its image side S4 being concave.

[0097] In this embodiment, the second lens group G2 has positive optical power and is a zoom group, including a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the optical axis from the object side to the image side. Specifically, the third lens E3 has positive optical power, with its object side S5 being convex and its image side S6 being convex; the fourth lens E4 has positive optical power, with its object side S7 being convex and its image side S8 being convex; and the fifth lens E5 has negative optical power, with its object side S9 being convex and its image side S10 being concave.

[0098] In this embodiment, the third lens group G3 has negative optical power and is a zoom group, including a sixth lens E6 and a seventh lens E7 arranged sequentially from the object side to the image side along the optical axis. The sixth lens E6 has optical power, with its object side S11 being concave and its image side S12 being convex; the seventh lens E7 has negative optical power, with its object side S13 being concave and its image side S14 being convex.

[0099] In this embodiment, the fourth lens group G4 has positive optical power and includes an eighth lens E8 and a ninth lens E9 arranged sequentially from the object side to the image side along the optical axis. The eighth lens E8 has positive optical power, and its object side S15 and image side S15 are convex. The ninth lens E9 has negative optical power, and its object side S17 is convex and its image side S18 is concave.

[0100] In this embodiment, the zoom lens also includes an aperture stop STO, which is disposed between the fourth lens E4 and the fifth lens E5.

[0101] Table 1 shows the radius of curvature R, thickness / distance, refractive index N, Abbe number V, and conic coefficient of each lens in the zoom lens of Example 1.

[0102]

[0103]

[0104] Table 1

[0105] In this example, the zoom lens group switches between wide-angle, mid-range, and telephoto states by changing the air gap D1 between the second and third lenses along the optical axis (i.e., the distance between the image side of the second lens E2 and the object side of the third lens E3 along the optical axis), the air gap D2 between the fifth and sixth lenses along the optical axis (i.e., the distance between the image side of the fifth lens E5 and the object side of the sixth lens E6 along the optical axis), and the air gap D3 between the seventh and eighth lenses along the optical axis (i.e., the distance between the image side of the seventh lens E7 and the object side of the eighth lens E8 along the optical axis).

[0106] Table 2 shows the specific parameter values ​​of the zoom lens group in Example 1 in the wide-angle, mid-range, and telephoto states, where FNO is the aperture value of the zoom lens group.

[0107]

[0108] Table 2

[0109] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the ninth lens E9 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0110]

[0111] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A1, and A2 that can be used for the aspherical mirrors S1 to S18 in Example 1. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0112]

[0113]

[0114] Table 3

[0115] Figure 4A , Figure 4B , Figure 4C , Figure 4D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state of Embodiment 1 are shown respectively. Figure 5A , Figure 5B , Figure 5C , Figure 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end of Example 1 are shown respectively. Figures 4A to 5D It can be seen that the zoom lens of Example 1 can achieve good image quality in all states.

[0116] Example 2

[0117] The following is for reference Figures 6 to 10D Description of a zoom lens according to Embodiment 2 of this application. Figure 6 , Figure 7 and Figure 8 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 2 of this application.

[0118] like Figures 6 to 8 As shown, in this embodiment, the zoom lens has a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 sequentially arranged along the optical axis from the object side to the image side, and also includes an imaging surface S19 located at the image side end. Specifically, the first lens group G1 includes a first lens E1 and a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7; and the fourth lens group G4 includes an eighth lens E8 and a ninth lens E9.

[0119] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave; the third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex; and the fifth lens E5 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. Lens S9 is convex, and its image-side surface S10 is concave; the sixth lens E6 has optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex; the seventh lens E7 has negative optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex; the eighth lens E8 has positive optical power, its object-side surface S15 is convex, and its image-side surface S15 is convex; the ninth lens E9 has negative optical power, its object-side surface S17 is convex, and its image-side surface S18 is concave.

[0120] Table 4 shows the radius of curvature R, thickness / distance, refractive index N, Abbe number V, and conic coefficient of each lens in the zoom lens of Example 2.

[0121]

[0122]

[0123] Table 4

[0124] In this example, the zoom lens group switches between wide-angle, mid-range, and telephoto states by changing the air gap D1 between the second and third lenses along the optical axis (i.e., the distance between the image side of the second lens E2 and the object side of the third lens E3 along the optical axis), the air gap D2 between the fifth and sixth lenses along the optical axis (i.e., the distance between the image side of the fifth lens E5 and the object side of the sixth lens E6 along the optical axis), and the air gap D3 between the seventh and eighth lenses along the optical axis (i.e., the distance between the image side of the seventh lens E7 and the object side of the eighth lens E8 along the optical axis).

[0125] Table 5 shows the specific parameter values ​​of the zoom lens in Example 2 when it is in the wide-angle, mid-range, and telephoto states, where FNO is the aperture value of the zoom lens group.

[0126]

[0127] Table 5

[0128] In Example 2, the object side and image side of the first lens E1 to the ninth lens E9 are both aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 6 shows the higher-order coefficients that can be used for each aspherical mirror S1 to S18 in Example 2.

[0129] Face number A4 A6 A8 A10 A12 A14 A16 S1 -1.99E-01 -1.35E-02 -6.44E-03 -1.41E-03 3.26E-04 -2.01E-04 1.59E-04 S2 -1.66E-01 -1.38E-02 -3.29E-03 -2.00E-03 8.85E-04 -4.78E-04 3.24E-04 S3 -1.90E-02 1.19E-03 8.36E-03 -2.43E-03 1.10E-03 -4.84E-04 2.10E-04 S4 -8.31E-02 2.37E-03 4.51E-03 -1.22E-03 3.54E-04 -7.70E-05 -2.55E-05 S5 -2.54E-01 -1.10E-02 1.32E-02 6.70E-03 3.08E-03 2.16E-03 1.03E-03 S6 4.04E-03 4.04E-02 1.40E-02 6.00E-03 3.94E-03 3.37E-03 1.16E-03 S7 5.19E-02 3.51E-02 9.46E-04 6.53E-03 7.86E-03 5.98E-03 2.13E-03 S8 1.70E-02 -1.27E-02 3.10E-03 6.80E-03 5.91E-03 2.81E-03 1.20E-03 S9 4.35E-02 -3.70E-03 4.30E-03 1.33E-03 1.15E-03 -5.62E-05 9.99E-05 S10 1.16E-01 7.89E-03 2.27E-03 1.91E-04 1.02E-04 -6.41E-06 4.61E-06 S11 1.14E-01 -1.02E-02 2.36E-04 -1.19E-04 5.39E-06 -9.33E-06 5.51E-06 S12 6.48E-02 -9.54E-03 -8.25E-05 -7.94E-05 -2.57E-06 -6.65E-07 1.41E-06 S13 -1.30E-01 4.08E-02 -2.73E-03 1.58E-03 -1.41E-04 1.09E-04 -6.78E-05 S14 -1.75E-01 4.85E-02 -6.17E-03 2.35E-03 -3.96E-04 2.13E-04 -1.41E-04 S15 -8.90E-01 -1.96E-01 -5.65E-02 -1.56E-02 -4.42E-03 -2.28E-03 -1.22E-03 S16 -9.40E-01 -9.25E-02 -8.69E-02 -1.48E-02 -6.39E-03 -4.75E-03 -1.60E-03 S17 -2.49E+00 6.68E-01 -2.10E-01 5.33E-02 -1.17E-02 -4.36E-03 6.35E-03 S18 -3.92E+00 2.62E-01 -2.62E-01 1.15E-02 -2.55E-02 -1.34E-02 6.88E-04 Face number A18 A20 A22 A24 A26 A28 A30 S1 -6.88E-05 6.17E-05 -4.30E-05 -9.76E-07 1.54E-06 9.46E-06 -4.30E-06 S2 -1.18E-04 8.33E-05 -1.00E-04 -1.85E-05 2.58E-05 2.23E-05 -1.25E-05 S3 -3.16E-05 -1.15E-05 -3.81E-05 -4.73E-05 4.55E-05 1.13E-05 -9.90E-06 S4 4.49E-05 -5.32E-05 3.46E-05 -2.80E-05 1.85E-05 -5.07E-06 1.91E-06 S5 3.18E-04 -1.15E-04 -9.70E-05 -4.19E-05 1.49E-05 4.26E-06 1.34E-06 S6 4.58E-04 -3.33E-04 -2.77E-05 -7.69E-05 4.17E-05 -3.77E-05 -6.15E-06 S7 3.23E-04 -7.93E-04 -3.73E-04 -1.62E-04 4.51E-05 -3.11E-05 -1.84E-05 S8 -1.91E-04 -3.90E-04 -1.81E-04 -8.14E-06 -5.76E-05 -8.25E-05 -2.22E-05 S9 -1.73E-04 -1.07E-04 -9.16E-05 1.87E-05 1.07E-05 -1.17E-05 -6.37E-06 S10 -1.10E-05 1.05E-06 -6.55E-06 -1.30E-06 -3.19E-07 5.63E-07 1.01E-06 S11 -4.19E-07 7.93E-06 -3.64E-07 5.47E-07 -1.59E-06 1.39E-06 -4.59E-07 S12 1.56E-06 4.70E-06 1.06E-06 -2.26E-08 -5.70E-07 1.27E-06 8.08E-07 S13 -3.85E-05 -1.42E-05 -6.08E-06 1.89E-05 -5.51E-07 -1.96E-06 -6.39E-06 S14 -6.05E-06 -3.00E-05 1.30E-05 1.27E-05 -1.79E-06 -4.60E-06 -4.49E-07 S15 -3.61E-04 2.87E-04 1.65E-04 2.80E-05 -3.76E-05 -7.72E-05 1.64E-05 S16 -6.96E-04 5.95E-04 -1.14E-04 4.77E-05 2.30E-06 -1.14E-04 1.28E-04 S17 1.23E-03 2.95E-03 -2.92E-03 -1.89E-04 -4.92E-04 -3.51E-04 6.92E-04 S18 2.02E-03 5.84E-03 -2.02E-03 1.81E-04 -6.19E-04 -7.84E-04 6.33E-05

[0130] Table 6

[0131] Figure 9A , Figure 9B , Figure 9C , Figure 9D The on-axis chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the zoom lens of Embodiment 2 in the second state are shown respectively. Figure 10A , Figure 10B , Figure 10C , Figure 10D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the first state of Embodiment 2 are shown respectively. Figures 9A to 10D It can be seen that the zoom lens of Example 2 can achieve good image quality in all states.

[0132] Example 3

[0133] The following is for reference Figures 11 to 15D Description of a zoom lens according to Embodiment 3 of this application. Figure 11 , Figure 12 and Figure 13These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 3 of this application.

[0134] like Figures 11 to 13 As shown, in this embodiment, the zoom lens has a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 sequentially arranged along the optical axis from the object side to the image side, and also includes an imaging surface S19 located at the image side end. Specifically, the first lens group G1 includes a first lens E1 and a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7; and the fourth lens group G4 includes an eighth lens E8 and a ninth lens E9.

[0135] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave; the third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex; and the fifth lens E5 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. Lens S9 is convex, and its image-side surface S10 is concave; the sixth lens E6 has optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex; the seventh lens E7 has negative optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex; the eighth lens E8 has positive optical power, its object-side surface S15 is convex, and its image-side surface S15 is convex; the ninth lens E9 has negative optical power, its object-side surface S17 is convex, and its image-side surface S18 is concave.

[0136] Table 7 shows the radius of curvature R, thickness / distance, refractive index N, Abbe number V, and conic coefficient of each lens in the zoom lens of Example 3.

[0137]

[0138]

[0139] Table 7

[0140] In this example, the zoom lens assembly is switched between the second state, the intermediate state, and the first state by changing the air gap D1 between the second and third lenses along the optical axis (i.e., the distance between the image side of the second lens E2 and the object side of the third lens E3 along the optical axis), the air gap D2 between the fifth and sixth lenses along the optical axis (i.e., the distance between the image side of the fifth lens E5 and the object side of the sixth lens E6 along the optical axis), and the air gap D3 between the seventh and eighth lenses along the optical axis (i.e., the distance between the image side of the seventh lens E7 and the object side of the eighth lens E8 along the optical axis).

[0141] Table 8 shows the specific parameter values ​​of the zoom lens group in Example 3 in the telephoto, intermediate, and wide-angle states, where FNO is the aperture value of the zoom lens group.

[0142]

[0143] Table 8

[0144] In Example 3, the object side and image side of the first lens E1 to the ninth lens E9 are aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 9 shows the higher-order coefficients that can be used for each aspherical mirror S1 to S18 in Example 3.

[0145]

[0146]

[0147] Table 9

[0148] Figure 14A , Figure 14B , Figure 14C , Figure 14D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state of Example 3 are shown respectively. Figure 15A , Figure 15B , Figure 15C , Figure 15D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end of Example 3 are shown respectively. Figures 14A to 15D It can be seen that the zoom lens of Example 3 can achieve good image quality in all states.

[0149] Example 4

[0150] The following is for reference Figures 16 to 20D The zoom lens according to Embodiment 4 of this application is described. Figure 16 , Figure 17 and Figure 18 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 4 of this application.

[0151] like Figures 16 to 18As shown, in this embodiment, the zoom lens has a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 sequentially arranged along the optical axis from the object side to the image side, and also includes an imaging surface S19 located at the image side end. Specifically, the first lens group G1 includes a first lens E1 and a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7; and the fourth lens group G4 includes an eighth lens E8 and a ninth lens E9.

[0152] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave; the third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex; and the fifth lens E5 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. Lens S9 is convex, and its image-side surface S10 is concave; the sixth lens E6 has optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex; the seventh lens E7 has negative optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex; the eighth lens E8 has positive optical power, its object-side surface S15 is convex, and its image-side surface S15 is convex; the ninth lens E9 has negative optical power, its object-side surface S17 is convex, and its image-side surface S18 is concave.

[0153] Table 10 shows the radius of curvature R, thickness / distance, refractive index N, Abbe number V, and conic coefficient of each lens in the zoom lens of Example 4.

[0154]

[0155] Table 10

[0156] In this example, the zoom lens group switches between wide-angle, mid-range, and telephoto states by changing the air gap D1 between the second and third lenses along the optical axis (i.e., the distance between the image side of the second lens E2 and the object side of the third lens E3 along the optical axis), the air gap D2 between the fifth and sixth lenses along the optical axis (i.e., the distance between the image side of the fifth lens E5 and the object side of the sixth lens E6 along the optical axis), and the air gap D3 between the seventh and eighth lenses along the optical axis (i.e., the distance between the image side of the seventh lens E7 and the object side of the eighth lens E8 along the optical axis).

[0157] Table 11 shows the specific parameter values ​​of the zoom lens group in Example 4 in the wide-angle, mid-range, and telephoto states, where FNO is the aperture value of the zoom lens group.

[0158]

[0159] Table 11

[0160] In Example 4, the object side and image side of the first lens E1 to the ninth lens E9 are both aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 12 shows the higher-order coefficients that can be used for each aspherical mirror S1 to S18 in Example 4.

[0161]

[0162]

[0163] Table 12

[0164] Figure 19A , Figure 19B , Figure 19C , Figure 19D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state of Example 4 are shown respectively. Figure 20A , Figure 20B , Figure 20C , Figure 20D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end of Example 4 are shown respectively. Figures 19A to 20D It can be seen that the zoom lens of Example 4 can achieve good image quality in all states.

[0165] Example 5

[0166] The following is for reference Figures 21 to 25D The zoom lens according to Embodiment 5 of this application is described. Figure 21 , Figure 22 and Figure 23 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 5 of this application.

[0167] like Figures 21 to 23 As shown, in this embodiment, the zoom lens has a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 sequentially arranged along the optical axis from the object side to the image side, and also includes an imaging surface S19 located at the image side end. Specifically, the first lens group G1 includes a first lens E1 and a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7; and the fourth lens group G4 includes an eighth lens E8 and a ninth lens E9.

[0168] In this embodiment, the first lens group G1 is a fixed group, and the second lens group G2, the third lens group G3 and the fourth lens group G4 are zoom groups.

[0169] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave; the third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex; and the fifth lens E5 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. Lens S9 is convex, and its image-side surface S10 is concave; the sixth lens E6 has optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex; the seventh lens E7 has negative optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex; the eighth lens E8 has positive optical power, its object-side surface S15 is convex, and its image-side surface S15 is convex; the ninth lens E9 has negative optical power, its object-side surface S17 is convex, and its image-side surface S18 is concave.

[0170] Table 13 shows the radius of curvature R, thickness / distance, refractive index N, Abbe number V, and conic coefficient of each lens in the zoom lens of Example 5.

[0171]

[0172] Table 13

[0173] In this example, the zoom lens group switches between wide-angle, mid-range, and telephoto states by changing the air gap D1 between the second and third lenses along the optical axis (i.e., the distance between the image side of the second lens E2 and the object side of the third lens E3 along the optical axis), the air gap D2 between the fifth and sixth lenses along the optical axis (i.e., the distance between the image side of the fifth lens E5 and the object side of the sixth lens E6 along the optical axis), the air gap D3 between the seventh and eighth lenses along the optical axis (i.e., the distance between the image side of the seventh lens E7 and the object side of the eighth lens E8 along the optical axis), and the air gap D4 between the ninth lens and the filter along the optical axis (i.e., the distance between the image side of the ninth lens E9 and the object side of the filter S19 along the optical axis).

[0174] Table 14 shows the specific parameter values ​​of the zoom lens group in Example 5 in the wide-angle, mid-range, and telephoto states, where FNO is the aperture value of the zoom lens group.

[0175]

[0176] Table 14

[0177] In Example 5, the object-side surface and image-side surface of the first lens E1 to the ninth lens E9 are both aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 15 shows the higher-order coefficients that can be used for each aspherical mirror S1 to S18 in Example 5.

[0178]

[0179]

[0180] Table 15

[0181] Figure 24A , Figure 24B , Figure 24C , Figure 24D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state of Example 5 are shown respectively. Figure 25A , Figure 25B , Figure 25C , Figure 25D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end of Example 5 are shown respectively. Figures 24A to 25D It can be seen that the zoom lens of Example 5 can achieve good image quality in all states.

[0182] Example 6

[0183] The following is for reference Figures 26 to 30D The zoom lens according to Embodiment 6 of this application is described. Figure 26 , Figure 27 and Figure 28 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 6 of this application.

[0184] like Figures 26 to 28 As shown, in this embodiment, the zoom lens has a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 sequentially arranged along the optical axis from the object side to the image side, and also includes an imaging surface S19 located at the image side end. Specifically, the first lens group G1 includes a first lens E1 and a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7; and the fourth lens group G4 includes an eighth lens E8 and a ninth lens E9.

[0185] In this embodiment, the first lens group G1 is a fixed group, and the second lens group G2, the third lens group G3 and the fourth lens group G4 are zoom groups.

[0186] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave; the third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex; and the fifth lens E5 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. Lens S9 is convex, and its image-side surface S10 is concave; the sixth lens E6 has optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex; the seventh lens E7 has negative optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex; the eighth lens E8 has positive optical power, its object-side surface S15 is convex, and its image-side surface S15 is convex; the ninth lens E9 has negative optical power, its object-side surface S17 is convex, and its image-side surface S18 is concave.

[0187] Table 16 shows the radius of curvature R, thickness / distance, refractive index N, Abbe number V, and conic coefficient of each lens in the zoom lens of Example 6.

[0188]

[0189] Table 16

[0190] In this example, the zoom lens group switches between wide-angle, mid-range, and telephoto states by changing the air gap D1 between the second and third lenses along the optical axis (i.e., the distance between the image side of the second lens E2 and the object side of the third lens E3 along the optical axis), the air gap D2 between the fifth and sixth lenses along the optical axis (i.e., the distance between the image side of the fifth lens E5 and the object side of the sixth lens E6 along the optical axis), the air gap D3 between the seventh and eighth lenses along the optical axis (i.e., the distance between the image side of the seventh lens E7 and the object side of the eighth lens E8 along the optical axis), and the air gap D4 between the ninth lens and the filter along the optical axis (i.e., the distance between the image side of the ninth lens E9 and the object side of the filter S19 along the optical axis).

[0191] Table 17 shows the specific parameter values ​​of the zoom lens in Example 6 when the zoom lens group is in the wide-angle end state, the middle end state, and the telephoto end state, where FNO is the aperture value of the zoom lens group.

[0192]

[0193]

[0194] Table 17

[0195] In Example 6, the object side and image side of the first lens E1 to the ninth lens E9 are both aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 18 shows the higher-order coefficients that can be used for each aspherical mirror S1 to S18 in Example 6.

[0196]

[0197]

[0198] Table 18

[0199] Figure 29A , Figure 29B , Figure 29C , Figure 29D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state of Example 6 are shown respectively. Figure 30A , Figure 30B , Figure 30C , Figure 30D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end of Example 6 are shown respectively. Figures 29A to 30D It can be seen that the zoom lens of Example 6 can achieve good image quality in all states.

[0200] Example 7

[0201] The following is for reference Figures 31 to 35D The zoom lens according to Embodiment 7 of this application is described. Figure 31 , Figure 32 and Figure 33 These are schematic diagrams showing the zoom lens in wide-angle, mid-range, and telephoto states according to Embodiment 7 of this application.

[0202] like Figures 31 to 33 As shown, in this embodiment, the zoom lens has a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 sequentially arranged along the optical axis from the object side to the image side, and also includes an imaging surface S19 located at the image side end. Specifically, the first lens group G1 includes a first lens E1 and a second lens E2; the second lens group G2 includes a third lens E3, a fourth lens E4, and a fifth lens E5; the third lens group G3 includes a sixth lens E6 and a seventh lens E7; and the fourth lens group G4 includes an eighth lens E8 and a ninth lens E9.

[0203] In this embodiment, the first lens group G1 is a fixed group, and the second lens group G2, the third lens group G3 and the fourth lens group G4 are zoom groups.

[0204] In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave; the third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex; the fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex; and the fifth lens E5 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. Lens S9 is convex, and its image-side surface S10 is concave; the sixth lens E6 has optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex; the seventh lens E7 has negative optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex; the eighth lens E8 has positive optical power, its object-side surface S15 is convex, and its image-side surface S15 is convex; the ninth lens E9 has negative optical power, its object-side surface S17 is convex, and its image-side surface S18 is concave.

[0205] Table 19 shows the radius of curvature R, thickness / distance, refractive index N, Abbe number V, and conic coefficient of each lens in the zoom lens of Example 7.

[0206]

[0207] Table 19

[0208] In this example, the zoom lens group switches between wide-angle, mid-range, and telephoto states by changing the air gap D1 between the second and third lenses along the optical axis (i.e., the distance between the image side of the second lens E2 and the object side of the third lens E3 along the optical axis), the air gap D2 between the fifth and sixth lenses along the optical axis (i.e., the distance between the image side of the fifth lens E5 and the object side of the sixth lens E6 along the optical axis), the air gap D3 between the seventh and eighth lenses along the optical axis (i.e., the distance between the image side of the seventh lens E7 and the object side of the eighth lens E8 along the optical axis), and the air gap D4 between the ninth lens and the filter along the optical axis (i.e., the distance between the image side of the ninth lens E9 and the object side of the filter S19 along the optical axis).

[0209] Table 20 shows the specific parameter values ​​of the zoom lens group in Example 7 in the wide-angle, mid-range, and telephoto states, where FNO is the aperture value of the zoom lens group.

[0210]

[0211]

[0212] Table 20

[0213] In Example 7, the object side and image side of the first lens E1 to the ninth lens E9 are both aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the formula (1) given in Example 1 above. Table 21 shows the higher-order coefficients that can be used for each aspherical mirror S1 to S18 in Example 7.

[0214]

[0215]

[0216] Table 21

[0217] Figure 34A , Figure 34B , Figure 34C , Figure 34D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the wide-angle end state of Embodiment 7 are shown respectively. Figure 35A , Figure 35B , Figure 35C , Figure 35D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the zoom lens in the telephoto end of Example 7 are shown respectively. Figures 34A to 35D It can be seen that the zoom lens of Example 7 can achieve good image quality in all states.

[0218] Appendix Figure 36A , 36B And 36C illustrates the effective half-aperture DT12 of the image side of the first lens, the effective half-aperture DT92 of the image side of the ninth lens, and the distance SAG71 along the optical axis from the intersection of the object side of the seventh lens along the optical axis to the vertex of the maximum effective half-aperture of the object side of the seventh lens, and the distance SAG72 along the optical axis from the intersection of the image side of the seventh lens along the optical axis to the vertex of the maximum effective half-aperture of the image side of the seventh lens.

[0219] The optical parameters of Examples 1 to 7 are shown in Table 22:

[0220]

[0221] Table 22

[0222] In summary, Examples 1 to 7 respectively satisfy the relationships shown in Table 23:

[0223]

[0224]

[0225] Table 23

[0226] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zoom lens, characterized in that, In order from the object side to the image side along the optical axis, comprising: a first lens group with negative refractive power, comprising a first lens with positive refractive power and a second lens with negative refractive power; a second lens group with positive refractive power, comprising a third lens with positive refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power; a third lens group with negative refractive power, comprising a sixth lens with refractive power and a seventh lens with negative refractive power; a fourth lens group with positive refractive power, comprising an eighth lens with positive refractive power and a ninth lens with negative refractive power, at least one surface of the ninth lens having an inflection point; wherein the zoom lens switches between a first state and a second state by changing at least the positions of the second lens group and the third lens group along the optical axis; wherein during the switching of the zoom lens between the first state and the second state, half of the maximum field of view angle Semi-FOV of the zoom lens satisfies 9.41°≤ Semi-FOV≤ 18.33°; and wherein the zoom lens satisfies: - 2.08 < f t f7 < -1.43, and -11.71 < f w (FG1 + FG4) < -1.93, wherein f7 is an effective focal length of the seventh lens; f t is an effective focal length of the zoom lens in the first state; f w is an effective focal length of the zoom lens in the second state; FG1 is an effective focal length of the first lens group; FG4 is an effective focal length of the fourth lens group; the number of lenses with refractive power in the zoom lens is nine; the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is concave, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is convex; the object side surface of the fourth lens is convex, and the image side surface is convex; the object side surface of the fifth lens is convex, and the image side surface is concave; the object side surface of the sixth lens is concave, and the image side surface is convex; the object side surface of the seventh lens is concave, and the image side surface is convex; the object side surface of the eighth lens is convex, and the image side surface is convex; the object side surface of the ninth lens is convex, and the image side surface is concave.

2. The zoom lens according to claim 1, characterized by The zoom lens satisfies: 2.06≤TTL w / (f t -f w )≤2.12, wherein TTL w is the distance from the object side of the first lens to the image plane along the optical axis when the zoom lens is in the second state, f t is the effective focal length of the zoom lens in the first state, and f w is the effective focal length of the zoom lens when it is in the second state.

3. The zoom lens according to claim 1, characterized by the zoom lens satisfies: -1.53≤ FG3 / FG2≤ -1.30, wherein FG3 is the effective focal length of the third lens group, and FG2 is the effective focal length of the second lens group.

4. The zoom lens according to claim 1, characterized by the zoom lens satisfies: 1.83≤ FG1 / FG3≤ 2.33, wherein FG1 is the effective focal length of the first lens group, and FG3 is the effective focal length of the third lens group.

5. The zoom lens according to claim 1, characterized by the zoom lens satisfies: -1.35≤ FG1 / FG4≤ -1.04, wherein FG3 is the effective focal length of the third lens group, and FG4 is the effective focal length of the fourth lens group.

6. The zoom lens according to claim 1, characterized by the zoom lens satisfies: 2.18≤ (R3-R4) / (R3+R4)≤ 4.46, wherein R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens.

7. The zoom lens according to claim 1, characterized by The zoom lens satisfies: 5.71 < f t / Imgh t ≤ 5.90, wherein f t is an effective focal length of the zoom lens in the first state, Img t is half of the diagonal length of the effective pixel area of the zoom lens in the first state.

8. The zoom lens according to claim 1, characterized by The zoom lens satisfies: 59.20≤TD t / (DT92-DT12)≤80.90, wherein TD t is the distance from the object side surface of the first lens to the image side surface of the ninth lens along the optical axis when the zoom lens is in the first state, DT92 is the effective half-aperture radius of the image side surface of the ninth lens, and DT12 is the effective half-aperture radius of the image side surface of the first lens.

9. The zoom lens according to claim 1, wherein The zoom lens satisfies: 0.75≤FG4 / f t ≤1.21, wherein FG4 is an effective focal length of the fourth lens group, f t is an effective focal length of the zoom lens in the first state.

10. The zoom lens according to claim 1, characterized by the zoom lens satisfies: 3.19≤ f3 / R5+f4 / R7≤ 3.63, wherein f3 is the effective focal length of the third lens, R5 is the radius of curvature of the object side surface of the third lens, f4 is the effective focal length of the fourth lens, and R7 is the radius of curvature of the object side surface of the fourth lens.

11. The zoom lens according to any one of claims 1 to 10, characterized by The zoom lens satisfies: 12.0 < V2 / N2 ≤ 36.31, 12.0 < V3 / N3 ≤ 54.45, 12.0 < V4 / N4 ≤ 36.31, 12.0 < V5 / N5 ≤ 12.22, 12.0 < V6 / N6 ≤ 14.31, 12.0 < V7 / N7 ≤ 36.31, and 12.0 < V8 / N8 ≤ 14.31, Wherein, V2 is the Abbe number of the second lens, N2 is the refractive index of the second lens, V3 is the Abbe number of the third lens, N3 is the refractive index of the third lens, V4 is the Abbe number of the second lens, N4 is the refractive index of the fourth lens, V5 is the Abbe number of the fifth lens, N5 is the refractive index of the fifth lens, V6 is the Abbe number of the sixth lens, N6 is the refractive index of the sixth lens, V7 is the Abbe number of the seventh lens, N7 is the refractive index of the seventh lens, V8 is the Abbe number of the eighth lens, and N8 is the refractive index of the eighth lens.

12. The zoom lens according to any one of claims 1 to 10, characterized by The zoom lens satisfies: 0.17 ≤ Dr1r4 / △T23 ≤ 0.25, Wherein, Dr1r4 is the distance along the optical axis from the object side surface of the first lens to the image side surface of the second lens, and △T23 is the change value of the interval distance T23t along the optical axis between the second lens and the third lens in the first state and the interval distance T23w along the optical axis between the second lens and the third lens in the second state, i.e. △T23 = |T23t-T23w|.

13. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: 0.58 ≤ Dr11r14 / △T78 ≤ 0.76, Wherein, Dr11r14 is the distance along the optical axis from the object side surface of the sixth lens to the image side surface of the seventh lens, and △T78 is the change value of the interval distance T78t along the optical axis between the seventh lens and the eighth lens in the first state and the interval distance T78w along the optical axis between the seventh lens and the eighth lens in the second state, i.e. △T78 = |T78t-T78w|.

14. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: 0.90 ≤ f3 / f8 ≤ 1.27, Wherein, f3 is the effective focal length of the third lens, and f8 is the effective focal length of the eighth lens.

15. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: 0.80 ≤ (R11+R12) / (R13+R14) ≤ 2.02, Wherein, R11 is the radius of curvature of the object side surface of the sixth lens, R12 is the radius of curvature of the image side surface of the sixth lens, R13 is the radius of curvature of the object side surface of the seventh lens, and R14 is the radius of curvature of the image side surface of the seventh lens.

16. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: -2.35 ≤ f9 / (R17+R18) ≤ -0.73, Wherein, f9 is the effective focal length of the ninth lens, R17 is the radius of curvature of the object side surface of the ninth lens, and R18 is the radius of curvature of the image side surface of the ninth lens.

17. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: 0.53 ≤ (CT1+CT2) / (CT6+CT7) ≤ 1.01, CT1 is a central thickness of the first lens along the optical axis, CT2 is a central thickness of the second lens along the optical axis, CT6 is a central thickness of the sixth lens along the optical axis, and CT7 is a central thickness of the seventh lens along the optical axis.

18. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: 3.42≤∑AT / T67≤5.05, where ∑AT is a total sum of interval distances of any two adjacent lenses from the first lens to the ninth lens along the optical axis when the zoom lens is in the second state, and T67 is an interval distance of the sixth lens and the seventh lens along the optical axis.

19. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: 1.79≤SAG71 / SAG72≤2.25, where SAG71 is a distance from an intersection of an object side surface of the seventh lens and the optical axis to a maximum effective half-aperture vertex of the object side surface of the seventh lens along the optical axis, and SAG72 is a distance from an intersection of an image side surface of the seventh lens and the optical axis to a maximum effective half-aperture vertex of the image side surface of the seventh lens along the optical axis.

20. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens satisfies: 1.84≤T78 / T67≤2.60, where T78 is an interval distance of the seventh lens and the eighth lens along the optical axis when the zoom lens is in the first state, and T67 is an interval distance of the sixth lens and the seventh lens along the optical axis.

21. The zoom lens according to any one of claims 1 to 10, wherein The zoom lens is switched between the first state and the second state by changing positions of the second lens group, the third lens group, and the fourth lens group along the optical axis.

Images