Zoom lens

Abstract

The utility model discloses a zoom lens, which comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power and a fifth lens group with focal power, and is characterized in that the first lens group, the third lens group and the fifth lens group are fixed groups; the first lens group comprises a first lens, a second lens and a third lens; the second lens group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens; the third lens group comprises an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens; the fourth lens group comprises a fourteenth lens, a fifteenth lens and a sixteenth lens; the fifth lens group comprises a seventeenth lens; the second lens group moves between the object side and the image side to realize continuous zooming between a wide-angle end and a telephoto end; and the fourth lens group moves between the object side and the image side so as to realize the compensation of the image surface position change in the zooming process.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to a zoom lens. Background Art

[0002] During use, the focal length of a zoom lens can be continuously changed within a certain range, and it has the characteristics of being able to adapt to the usage needs of different scenarios. Its market demand is constantly increasing.

[0003] With the development of modern society and advancements in science and technology, zoom optical systems have become widely used in various aspects of life, such as security monitoring and intelligent transportation. The use of zoom lenses has increased year by year, and the requirements for their optical performance and product stability have also become increasingly higher.

[0004] However, the following problems still exist in existing zoom lenses: 1) The imaging target surface size of existing zoom lenses is small, and the resolution of the collected images is low; 2) The aperture of existing zoom lenses is small and changes during zooming, and the imaging picture is not transparent; 3) The existing zoom lenses use a large number of lenses and the lens size is large, making it impossible to achieve a miniaturized design of the entire camera; 4) The focus of existing zoom lenses drifts in high and low temperature environments, and the imaging effect is easily seriously affected by the environment; 5) The distortion of existing zoom lenses is large, which causes the surrounding people or scenes captured to be distorted, and the scene cannot be truly restored.

[0005] Therefore, designing a zoom lens with at least one of the following characteristics: large target area, high resolution, constant large aperture, small size, low distortion, and no out-of-focus at high and low temperatures is one of the hot topics of research for those skilled in the art. Utility Model Content

[0006] The present application provides a zoom lens that includes, in order from the object side to the image side along the optical axis: a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with positive optical power, and a fifth lens group with optical power. The first, third, and fifth lens groups are fixed groups, the second lens group is a zoom group, and the fourth lens group is a compensation group. The first lens group includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, and a third lens; the second lens group includes, in order from the object side to the image side along the optical axis: a fourth lens, a fifth lens, a sixth lens, and a seventh lens; the third lens group includes, in order from the object side to the image side along the optical axis: an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens; the fourth lens group includes, in order from the object side to the image side along the optical axis: a fourteenth lens, a fifteenth lens, and a sixteenth lens; and the fifth lens group includes a seventeenth lens. The twelfth lens has positive focal power, the thirteenth lens has negative focal power, the fifteenth lens has positive focal power, and the sixteenth lens has negative focal power. The second lens group moves along the optical axis between the object side and the image side to achieve continuous zooming between wide-angle and telephoto ends. The fourth lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming.

[0007] In one embodiment, the first lens has positive optical power; the second lens has negative optical power; and the third lens has positive optical power.

[0008] In one embodiment, the object-side surface of the first lens is convex, and the image-side surface is convex; the object-side surface of the second lens is concave, and the image-side surface is convex; the object-side surface of the third lens is convex, and the image-side surface is concave.

[0009] In one embodiment, the fourth lens has negative optical power; the fifth lens has negative optical power; the sixth lens has positive optical power; and the seventh lens has negative optical power.

[0010] In one embodiment, the image-side surface of the fourth lens is concave; the object-side surface and the image-side surface of the fifth lens are concave; the object-side surface and the image-side surface of the sixth lens are convex; and the object-side surface and the image-side surface of the seventh lens are concave.

[0011] In one embodiment, the eighth lens has positive optical power; the ninth lens has positive optical power; the tenth lens has negative optical power; and the eleventh lens has positive optical power.

[0012] In one embodiment, the object-side surface of the eighth lens is convex, and the image-side surface is concave; the object-side surface of the ninth lens is convex, and the image-side surface is convex; the object-side surface of the tenth lens is concave, and the image-side surface is concave; the object-side surface of the eleventh lens is convex, and the image-side surface is concave; the object-side surface of the twelfth lens is convex, and the image-side surface is convex; and the image-side surface of the thirteenth lens is concave, and the image-side surface is concave.

[0013] In one embodiment, the fourteenth lens has positive optical power.

[0014] In one embodiment, the object-side surface of the fourteenth lens is convex, and the image-side surface is convex; the object-side surface of the fifteenth lens is concave, and the image-side surface is convex; the object-side surface of the sixteenth lens is concave, and the image-side surface is concave.

[0015] In one embodiment, the seventeenth lens has positive or negative power.

[0016] In one embodiment, the object-side surface of the seventeenth lens is convex, and the image-side surface is concave.

[0017] In one embodiment, the zoom lens satisfies: 3.7≤FG1 / Fw≤6.2, where FG1 is the effective focal length of the first lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0018] In one embodiment, the zoom lens satisfies: -1.8≤FG2 / Fw≤-1.4, where FG2 is the effective focal length of the second lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0019] In one embodiment, the zoom lens satisfies: 1.56≤FG3 / Fw≤2.3, where FG3 is the effective focal length of the third lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0020] In one embodiment, the zoom lens satisfies: 2.23≤FG4 / Fw≤3, where FG4 is the effective focal length of the fourth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0021] In one embodiment, the zoom lens satisfies: 7.9≤|FG5 / Fw|≤32.5, where FG5 is the effective focal length of the fifth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0022] In one embodiment, the zoom lens satisfies: 1.6≤D2 / IH≤1.7, where D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, and IH is the maximum image height of the zoom lens.

[0023] In one embodiment, the zoom lens satisfies the following condition: 4.16≤TTL / D2≤4.37, where TTL is the on-axis distance between the object-side surface of the first lens and the imaging surface of the zoom lens, and D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end.

[0024] In one embodiment, the zoom lens satisfies the following: 1.1≤D2 / Fw≤1.8, where D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0025] In one embodiment, the Abbe number Vd of at least one lens in the third lens group is G3 Satisfy: 50≤Vd G3 ≤75.

[0026] In one embodiment, the zoom lens satisfies: 0.18≤TG4 / FG4≤0.31, where TG4 is the thickness of the fourth lens group on the optical axis, and FG4 is the effective focal length of the fourth lens group.

[0027] In one embodiment, the zoom lens satisfies: 0.34≤Ft / FG1≤0.6, where Ft is the total effective focal length of the zoom lens at the telephoto end, and FG1 is the effective focal length of the first lens group.

[0028] In one embodiment, the zoom lens satisfies: 1.46≤f8 / FG3≤2.5, where f8 is the effective focal length of the eighth lens group, and FG3 is the effective focal length of the third lens group.

[0029] In one embodiment, the zoom lens satisfies: 6.98≤TTL / IH≤7.4, where TTL is the on-axis distance from the object-side surface of the first lens to the imaging surface of the zoom lens, and IH is the maximum image height of the zoom lens.

[0030] In one embodiment, the zoom lens satisfies the following condition: 36.4≤TTL / (Ft / Fw)≤41.4, where TTL is the on-axis distance between the object-side surface of the first lens element and the imaging surface of the zoom lens, Ft is the total effective focal length of the zoom lens at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0031] In one embodiment, the zoom lens satisfies: 2.58≤(f12-f13) / FG3≤3.24, where f12 is the effective focal length of the twelfth lens, f13 is the effective focal length of the thirteenth lens, and FG3 is the effective focal length of the third lens group.

[0032] In one embodiment, the zoom lens satisfies: 1.41≤f1 / FG1≤1.6, where f1 is the effective focal length of the first lens, and FG1 is the effective focal length of the first lens group.

[0033] In one embodiment, the zoom lens satisfies: 2.0≤Ft / Fw≤2.5, where Ft is the total effective focal length of the zoom lens at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0034] In one embodiment, the zoom lens satisfies at least one of the following: 3.95≤FG1 / Fw≤6.2, -1.8≤FG2 / Fw≤-1.45, 1.6≤FG3 / Fw≤2.3, 2.3≤FG4 / Fw≤2.9, 7.9≤|FG5 / Fw|≤32.1, 1.65≤D2 / IH≤1.7, 4.15≤TTL / D2≤4.37, 1.2≤D2 / Fw≤1.7, 1.6≤f8 / FG3≤2.42, 7≤TTL / IH≤7.4, 36.9≤TTL / (Ft / Fw)≤40.75, 2.6≤(f12-f13) / FG3≤2.9, 2.2≤Ft / Fw≤2.5, wherein FG1 is the first where F is the effective focal length of the first lens group, FG2 is the effective focal length of the second lens group, FG3 is the effective focal length of the third lens group, FG4 is the effective focal length of the fourth lens group, FG5 is the effective focal length of the fifth lens group, Fw is the total effective focal length of the zoom lens at the wide-angle end, D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, IH is the maximum image height of the zoom lens, TTL is the on-axis distance from the object-side surface of the first lens to the imaging plane of the zoom lens, Ft is the total effective focal length of the zoom lens at the telephoto end, f8 is the effective focal length of the eighth lens element, f12 is the effective focal length of the twelfth lens, and f13 is the effective focal length of the thirteenth lens.

[0035] The zoom lens according to the present application adopts a five-group structure of fixed + zoom + fixed + compensation + fixed. By reasonably setting the optical focal length and movement mode of the first lens group to the fifth lens group, the zoom lens provided by the present application has at least one of the beneficial effects of continuous zoom, a wide range of focus object distances, a constant aperture, a small size, a large target surface, low distortion, high resolution, infrared confocality, and no defocusing at high and low temperatures of -40°C to 80°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1A and Figure 1BSchematic diagrams of the structures of the zoom lens at the wide-angle end and the telephoto end according to Example 1 of the present application;

[0038] Figure 1C and Figure 1D These are distortion diagrams of the zoom lens according to Example 1 of the present application when it is at the wide-angle end and the telephoto end, respectively;

[0039] Figure 2A and Figure 2B Schematic diagrams of the structures of the zoom lens at the wide-angle end and the telephoto end according to Example 2 of the present application, respectively;

[0040] Figure 2C and Figure 2D These are distortion diagrams of the zoom lens according to Example 2 of the present application at the wide-angle end and the telephoto end, respectively;

[0041] Figure 3A and Figure 3B Schematic diagrams of the structures of the zoom lens at the wide-angle end and the telephoto end according to Example 3 of the present application;

[0042] Figure 3C and Figure 3D These are distortion diagrams of the zoom lens according to Example 3 of the present application at the wide-angle end and the telephoto end, respectively;

[0043] Figure 4A and Figure 4B Schematic diagrams of the structures of the zoom lens at the wide-angle end and the telephoto end according to Example 4 of the present application;

[0044] Figure 4C and Figure 4D These are distortion diagrams of the zoom lens according to Example 4 of the present application when it is at the wide-angle end and the telephoto end;

[0045] Figure 5A and Figure 5B Schematic diagrams of the structures of the zoom lens at the wide-angle end and the telephoto end according to Example 5 of the present application, respectively;

[0046] Figure 5C and Figure 5D The following are distortion diagrams of the zoom lens according to Example 5 of the present application when it is at the wide-angle end and the telephoto end. DETAILED DESCRIPTION

[0047] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present 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.

[0048] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0049] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0050] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface shape in the paraxial area can be judged according to the general method in this field, for example, the positive and negative R value (R refers to the curvature radius of the paraxial area) is used to judge the convexity. In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging side is called the image side of the lens. In terms of the object side, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; in terms of the image side, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0051] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0052] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0053] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] The features, principles and other aspects of the present application are described in detail below.

[0055] According to an exemplary embodiment of the present application, the zoom lens may include five lens groups with optical power, namely a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with positive optical power and a fifth lens group with positive or negative optical power. These five lens groups are arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens group, the third lens group and the fifth lens group are fixed groups, and the first lens group, the third lens group and the fifth lens group can be fixed relative to the position of the imaging surface of the zoom lens. The second lens group is a zoom group, which can move between the object side and the image side along the optical axis so that the zoom lens can achieve continuous zooming between the wide-angle end and the telephoto end. The fourth lens group is a compensation group, which moves along the optical axis corresponding to the movement of the second lens group to achieve compensation for changes in the image plane position during zooming.

[0056] In an exemplary embodiment, the first lens group has positive optical power. The main function of the first lens is to correct the field curvature of the system at different object distances, while reducing tolerance sensitivity and ensuring image uniformity.

[0057] In an exemplary embodiment, the second lens group has negative optical focal length and can be moved along the optical axis between the object side and the image side. By changing the position of the second lens group on the optical axis, the zoom lens can be switched from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, so that the zoom lens can perform continuous zooming.

[0058] In an exemplary embodiment, the third lens group has positive optical power, which can effectively control the direction of light, make the light transition smoothly, reduce the generation of aberrations, and help ensure the resolution quality of the lens; it can also help the lens to achieve athermalization, so that the optical lens has good temperature performance, which is beneficial for the lens to avoid defocusing in high and low temperature environments.

[0059] In this exemplary embodiment, the fourth lens group has positive refractive power and primarily compensates for image plane position variations during zooming. During continuous zooming, the fourth lens group can move along the optical axis in a manner consistent with the movement of the second lens group to compensate for image plane variations, thereby ensuring image quality during continuous zooming.

[0060] In an exemplary embodiment, the fifth lens group has positive or negative optical power, which is beneficial for reducing the change of field curvature during the entire zooming process and improving the optical imaging quality.

[0061] In an exemplary embodiment, the first lens group may include, in order from the object side to the image side along the optical axis: a first lens, a second lens, and a third lens. The first lens group may include two lenses with positive optical power and one lens with negative optical power. Exemplarily, the first lens may have positive optical power, with a convex object-side surface and a convex image-side surface; the second lens may have negative optical power, with a concave object-side surface and a convex image-side surface; and the third lens may have positive optical power, with a convex object-side surface and a concave image-side surface. The first lens is a positive convex-convex lens, the second lens is a negative convex-convex lens, and the third lens is a positive convex-concave lens. The inclusion of two meniscus lenses in the first lens group facilitates correction of field curvature at different object distances. Convex object-side surface and concave image-side surface of the first lens facilitates reducing distortion in the optical system, ensuring that the absolute value of optical distortion (DIS) satisfies |DIS| ≤ |±5.5%| at the wide-angle end and DIS ≤ 8.2% at the telephoto end.

[0062] In an exemplary embodiment, the first lens and the second lens may cooperate with each other to form a doublet lens, which is beneficial for correcting chromatic aberration at the telephoto end of the lens.

[0063] In an exemplary embodiment, the second lens group may include, in order from the object side to the image side along the optical axis: a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The second lens group may be provided with at least two lenses with negative optical power. Exemplarily, the fourth lens has negative optical power, its object side surface is concave or convex, and its image side surface is concave; the fifth lens has negative optical power, its object side surface is concave, and its image side surface is concave; the sixth lens has positive optical power, its object side surface is convex, and its image side surface is convex; the seventh lens has negative optical power, its object side surface is concave, and its image side surface is concave. The second lens group is provided with at least two negative lenses, which is conducive to increasing the divergence speed of light and improving zoom efficiency. In particular, the rational configuration of the optical power of the fourth lens and the seventh lens, when the fourth lens and the seventh lens have negative optical power, can help accelerate the divergence speed of light and improve the zoom efficiency of the lens.

[0064] In an exemplary embodiment, the second lens group may include a cemented lens, which helps balance positional chromatic aberration in the second lens group and improve the overall resolution of the optical system. Exemplarily, the fifth and sixth lenses may combine to form a doublet. Exemplarily, the fifth, sixth, and seventh lenses may combine to form a triplet.

[0065] In an exemplary embodiment, the third lens group may include, in order from the object side to the image side along the optical axis, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens. Exemplarily, the eighth lens has positive optical power, with its object-side surface being convex and its image-side surface being concave; the ninth lens has positive optical power, with its object-side surface being convex and its image-side surface being convex; the tenth lens has negative optical power, with its object-side surface being concave and its image-side surface being concave; the eleventh lens has positive optical power, with its object-side surface being convex and its image-side surface being concave; the twelfth lens has positive optical power, with its object-side surface being convex and its image-side surface being convex; and the thirteenth lens has negative optical power, with its object-side surface being concave and its image-side surface being concave. The eighth lens is configured as a meniscus lens with positive optical power, which facilitates correction of field curvature.

[0066] In an exemplary embodiment, the third lens group may include a cemented lens. For example, the ninth lens, the tenth lens, and the eleventh lens may be cemented into a triplet lens. The optical powers of the ninth lens, the tenth lens, and the eleventh lens are reasonably set so that they use positive and negative optical powers to match each other, which is conducive to the mutual compensation of positive and negative spherical aberrations and improves the image resolution of the lens. At the same time, the trend of light is effectively controlled to ensure a smooth transition of light, effectively reducing the tolerance sensitivity of the third lens group, and can also reduce the angle of the light emitted from the image side of the eleventh lens, effectively reducing the height of the light and reducing the generation of aberrations.

[0067] In an exemplary embodiment, the twelfth lens having positive optical power and the thirteenth lens having negative optical power cooperate with each other to effectively control the direction of light, allowing the light to be transmitted smoothly, effectively reducing the tolerance sensitivity of the third lens group, and improving the production yield of the lens; at the same time, the thirteenth lens has negative optical power, which is beneficial for the light to diverge after passing through the thirteenth lens, so that the light is better transmitted to the fourth lens group, which is beneficial for correcting aberrations and improving the imaging performance of the lens.

[0068] In an exemplary embodiment, the fourth lens group may include, in order from the object side to the image side along the optical axis, a fourteenth lens, a fifteenth lens, and a sixteenth lens. The fourth lens group may include two lenses with positive optical power and one lens with negative optical power. The two positive lenses help balance the astigmatism and chromatic aberration introduced by the preceding lens group, while the one negative lens helps balance various aberrations of the optical system. Exemplarily, the fourteenth lens has positive optical power, with a convex object-side surface and a convex image-side surface; the fifteenth lens has positive optical power, with a concave object-side surface and a convex image-side surface; and the sixteenth lens has negative optical power, with a concave object-side surface and a concave image-side surface.

[0069] In an exemplary embodiment, the fifth lens group may include a seventeenth lens having positive or negative refractive power. The seventeenth lens may be a convexo-concave plastic lens, which facilitates an athermal lens design and effectively controls the trajectory of light emitted from the seventeenth lens to better match the requirements of large-area chips. This also helps balance various aberrations in the optical system and improve lens performance.

[0070] In an exemplary embodiment, the zoom lens according to the present application further includes an aperture stop disposed between the second lens group and the third lens group. For example, the aperture stop may be disposed between the seventh lens group and the eighth lens group. However, it should be noted that the aperture stop positions disclosed herein are merely exemplary and non-limiting; in alternative embodiments, the aperture stop may be disposed in other positions as desired.

[0071] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following relationship: 3.7 ≤ FG1 / Fw ≤ 6.2, where FG1 is the effective focal length of the first lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, FG1 and Fw may further satisfy 3.95 ≤ FG1 / Fw ≤ 6.2. This 3.7 ≤ FG1 / Fw ≤ 6.2, along with proper control of the focal length of the first lens group and the total effective focal length of the zoom lens at the wide-angle end, facilitates converging incident light at large angles into the optical system, effectively expanding the optical system's field of view.

[0072] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following: -1.8 ≤ FG2 / Fw ≤ -1.4, where FG2 is the effective focal length of the second lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, FG2 and Fw may further satisfy -1.8 ≤ FG2 / Fw ≤ -1.45. By properly controlling the focal length of the second lens group, achieving imaging performance while maintaining the desired zoom ratio during zooming is beneficial.

[0073] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following: 1.56 ≤ FG3 / Fw ≤ 2.3, where FG3 is the effective focal length of the third lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, FG3 and Fw may further satisfy 1.6 ≤ FG3 / Fw ≤ 2.3. This 1.56 ≤ FG3 / Fw ≤ 2.3 rationally distributes the focal length of the third lens group, facilitates the third lens group to collect light emitted from the second lens group, and ensures a smooth transition of light, effectively minimizing aberrations and improving optical imaging quality.

[0074] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following conditions: 2.23 ≤ FG4 / Fw ≤ 3, where FG4 is the effective focal length of the fourth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, FG4 and Fw may further satisfy 2.3 ≤ FG4 / Fw ≤ 2.9. By satisfying 2.23 ≤ FG4 / Fw ≤ 3, by properly controlling the focal length of the fourth lens group, image stability during zooming is ensured, and spherical aberration is reduced throughout the zooming process, thereby achieving high imaging performance. Optical distortion can also be effectively reduced, with the absolute value of the optical distortion DIS of the optical lens satisfying |DIS| ≤ |±5.5%| at the wide-angle end and DIS ≤ 8.2% at the telephoto end, achieving a low distortion effect.

[0075] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following condition: 7.9 ≤ |FG5 / Fw| ≤ 32.5, where FG5 is the effective focal length of the fifth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, FG5 and Fw may further satisfy 7.9 ≤ |FG5 / Fw| ≤ 32.1. By properly controlling the focal length of the fifth lens group, the change in field curvature during the entire zooming process can be reduced, thereby improving optical imaging quality.

[0076] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following relationship: 1.6 ≤ D2 / IH ≤ 1.7, where D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, and IH is the maximum image height of the zoom lens. More specifically, D2 and IH may further satisfy 1.65 ≤ D2 / IH ≤ 1.7. When 1.6 ≤ D2 / IH ≤ 1.7 is satisfied, controlling the movement distance of the second lens group at the same image height effectively limits the length of the optical lens, thereby facilitating miniaturization of the optical lens and achieving a total optical length (TTL) of less than 95 mm for the zoom lens.

[0077] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following relationship: 4.16 ≤ TTL / D2 ≤ 4.37, where D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, and TTL is the on-axis distance from the object-side surface of the first lens to the imaging surface of the zoom lens. More specifically, TTL and D2 may further satisfy 4.15 ≤ TTL / D2 ≤ 4.37. Satisfying 4.16 ≤ TTL / D2 ≤ 4.37 controls the ratio of the total optical length of the lens to the travel distance of the second lens group within a specific range, which is beneficial for achieving a small size while maintaining tolerance sensitivity and improving the zoom response speed of the lens.

[0078] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy the following relationship: 1.1 ≤ D2 / Fw ≤ 1.8, where D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, D2 and Fw may further satisfy 1.2 ≤ D2 / Fw ≤ 1.7. Meeting 1.1 ≤ D2 / Fw ≤ 1.8 helps reduce aberrations between the first lens group and the second lens group, while also controlling the size of the lens and reducing design costs.

[0079] In the exemplary embodiment of the present application, the Abbe number Vd of at least one lens in the third lens group is G3 Satisfy: 50≤Vd G3 ≤75, reasonably controlling the Abbe number of the third lens group so that the Abbe number of at least one lens in the third lens group meets the range of this conditional expression is beneficial to effectively correcting the chromatic aberration of the third lens group, thereby improving the imaging quality of the optical system.

[0080] In an exemplary embodiment of the present application, the zoom lens according to the present application satisfies the following conditions: 0.18 ≤ TG4 / FG4 ≤ 0.31, where TG4 is the thickness of the fourth lens group on the optical axis (i.e., the on-axis distance from the object-side surface of the fourteenth lens element to the image-side surface of the sixteenth lens element), and FG4 is the effective focal length of the fourth lens group. By properly setting the ratio of the thickness of the fourth lens group to the focal length of the fourth lens group, the fourth lens group is reduced in size, facilitating miniaturization of the lens and reducing the total optical length (TTL) to less than 95 mm.

[0081] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies the following relationship: 0.34 ≤ Ft / FG1 ≤ 0.6, where Ft is the total effective focal length of the zoom lens at the telephoto end, and FG1 is the effective focal length of the first lens group. This condition helps balance various aberrations of the zoom lens at the telephoto end, thereby improving resolution.

[0082] In an exemplary embodiment of the present application, the zoom lens system according to the present application satisfies the following conditions: 1.46 ≤ f8 / FG3 ≤ 2.5, where f8 is the effective focal length of the eighth lens element and FG3 is the effective focal length of the third lens group. More specifically, f8 and FG3 can further satisfy 1.6 ≤ f8 / FG3 ≤ 2.42. By satisfying 1.46 ≤ f8 / FG3 ≤ 2.5 and rationally controlling the ratio of the focal length of the eighth lens element to the focal length of the third lens group, the eighth lens element achieves a light-collecting effect, thereby ensuring light transmission and improving the illumination of the optical system.

[0083] In an exemplary embodiment of the present application, the zoom lens according to the present application satisfies the following conditions: 6.98 ≤ TTL / IH ≤ 7.4, where TTL is the on-axis distance from the object-side surface of the first lens element to the imaging plane of the zoom lens, and IH is the maximum image height of the zoom lens. More specifically, TTL and IH can further satisfy 7 ≤ TTL / IH ≤ 7.4. Satisfying 6.98 ≤ TTL / IH ≤ 7.4 and rationally controlling the ratio of the lens's image plane size to its total optical length within a specific range facilitates achieving a compact size while maintaining image quality at full image height.

[0084] In an exemplary embodiment of the present application, the zoom lens according to the present application satisfies the following conditions: 36.4≤TTL / (Ft / Fw)≤41.4, wherein Ft is the total effective focal length of the zoom lens when at the telephoto end, Fw is the total effective focal length of the zoom lens when at the wide-angle end, and TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens. More specifically, TTL, Ft, and Fw may further satisfy 36.9≤TTL / (Ft / Fw)≤40.75. Satisfying 36.4≤TTL / (Ft / Fw)≤41.4 and rationally controlling the ratio of the total optical length TTL of the lens to the zoom ratio Ft / Fw of the lens within a specific range is beneficial for achieving the beneficial effect of a small lens size while ensuring image quality and tolerance sensitivity while meeting the required zoom ratio of the lens.

[0085] In an exemplary embodiment of the present application, the zoom lens according to the present application satisfies the following conditions: 2.58 ≤ (f12 - f13) / FG3 ≤ 3.24, where f12 is the effective focal length of the twelfth lens, f13 is the effective focal length of the thirteenth lens, and FG3 is the effective focal length of the third lens group. More specifically, f12, f13, and FG3 may further satisfy 2.6 ≤ (f12 - f13) / FG3 ≤ 2.9. Satisfying 2.58 ≤ (f12 - f13) / FG3 ≤ 3.24 and rationally controlling the ratio of the difference between the effective focal lengths of the twelfth and thirteenth lenses to the effective focal length of the third lens group within a specific range facilitates athermalization of the zoom lens.

[0086] In an exemplary embodiment of the present application, the zoom lens according to the present application satisfies the following conditions: 1.41 ≤ f1 / FG1 ≤ 1.6, where f1 is the effective focal length of the first lens element, and FG1 is the effective focal length of the first lens group. Satisfying 1.41 ≤ f1 / FG1 ≤ 1.6 and properly controlling the ratio of the effective focal length of the first lens element to the effective focal length of the first lens group within a specific range facilitates the proper distribution of the optical power of the first lens element and reduces the front aperture of the zoom lens.

[0087] In an exemplary embodiment of the present application, the zoom lens according to the present application satisfies the following conditions: 2.0 ≤ Ft / Fw ≤ 2.5, where Ft is the total effective focal length of the zoom lens at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, Ft and Fw can further satisfy 2.2 ≤ Ft / Fw ≤ 2.5. Satisfying 2.0 ≤ Ft / Fw ≤ 2.5 allows for proper control of the ratio of the total effective focal lengths of the zoom lens at the telephoto end to the wide-angle end, i.e., controls the zoom ratio of the lens, ensuring that the lens meets the required zoom ratio and improving zoom efficiency.

[0088] In an exemplary embodiment, a distance TTL from the object-side surface of the first lens element to the imaging surface of the zoom lens element on the optical axis in the zoom lens element according to the present application may satisfy: TTL<95 mm.

[0089] In an exemplary embodiment, the aperture number Fno of the zoom lens according to the present application is constant, for example, Fno is 1.6. The zoom lens according to the present application maintains a constant aperture during zooming, does not reduce image resolution, and provides clear images with natural background blur.

[0090] In an exemplary embodiment, the absolute value of the optical distortion DIS of the optical lens according to the present application satisfies |DIS|≤|±5.5%| at the wide-angle end, and the optical distortion DIS≤8.2% at the telephoto end, and has the characteristic of low distortion.

[0091] In an exemplary embodiment, the total effective focal length Fw of the zoom lens according to the present application at the wide-angle end satisfies: 12.95 mm ≤ Fw ≤ 17 mm, and the total effective focal length Ft of the zoom lens at the telephoto end satisfies: 30 mm ≤ Ft ≤ 38 mm.

[0092] In an exemplary embodiment, the present application uses a combination of spherical lenses and aspherical lenses, which helps to reduce the difficulty of lens processing; at the same time, through material matching, a heat-free design can be achieved. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, and even all lenses use aspherical lenses. The characteristic of aspherical lenses is that the curvature changes continuously from the center of the lens to the periphery. Unlike spherical lenses with a constant curvature from the center of the lens to the periphery, aspherical lenses have better curvature radius characteristics and have the advantages of improving distortion aberration and improving astigmatism aberration. After using aspherical lenses, the aberrations that occur during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. Optionally, the object side and image side of the twelfth lens, the thirteenth lens, the fifteenth lens, the sixteenth lens and the seventeenth lens are aspherical mirror surfaces.

[0093] The zoom lens of the present application can adopt a glass-plastic hybrid lens structure, which reduces the design cost while ensuring the required zoom ratio of the lens and has excellent resolution.

[0094] The zoom lens according to the present application adopts a five-group structure of fixed + zoom + fixed + compensation + fixed. More specifically, the five-group structure includes a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, and a fifth lens group with positive or negative focal power. It also includes an aperture arranged between the second lens group and the third lens group, which can well correct field curvature and distortion, while meeting the use requirements of a large target surface (the maximum imaging target surface can reach 12.8mm). The focal power of each group is reasonably matched so that the light can correct high-order aberrations to a large extent when passing smoothly through the lens, thereby improving the imaging quality. At the same time, the joint movement of the zoom group and the compensation group realizes the continuous zoom of the zoom lens between the wide-angle end and the telephoto end, compensates for the aberrations caused during the zoom movement, effectively achieves the aberration balance of each focal length of the zoom lens, and ensures the clarity of the image under different focal lengths.

[0095] The zoom lens of this application has excellent resolution, with a resolution of over 8K.

[0096] The zoom lens of the present application is small in size and maximizes performance in the smallest possible size.

[0097] The zoom lens of the present application solves the problem of focus drift in high and low temperature environments while taking into account infrared performance. The zoom lens of the present application does not have out-of-focus in the temperature range of -40°C to 80°C, and is suitable for various high and low temperature environments, greatly broadening the application range of the zoom lens of the present application.

[0098] The zoom lens of the present application has the characteristic of confocality of visible light and infrared, realizes the correction of chromatic aberration and secondary spectrum in the 420nm to 940nm band, and can ensure resolution without refocusing when switching between day and night.

[0099] The zoom lens of the present application has a wide range of focus distances, and can ensure clear focus from an object distance of 0.1m to infinity throughout the entire zoom range.

[0100] This application reasonably sets the optical focal length of each lens group as well as the optical focal length and surface shape of each lens, which is beneficial for the zoom lens to have better ability to correct optical aberrations and chromatic aberrations when switching between the wide-angle end and the telephoto end. It is also beneficial to reduce the tolerance sensitivity of the system and improve the uniformity of the picture.

[0101] Optionally, in other alternative exemplary embodiments, the zoom lens may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0102] However, those skilled in the art will appreciate that the number of lenses comprising the zoom lens can be varied to achieve the various results and advantages described herein without departing from the claimed technical solutions. For example, while the embodiments describe seventeen lenses as an example, the zoom lens is not limited to seventeen lenses. If desired, the zoom lens may also include other numbers of lenses.

[0103] Specific embodiments of the zoom lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0104] Example 1

[0105] The following reference Figures 1A to 1D A zoom lens 100 according to Embodiment 1 of the present application will be described. Figure 1A is a structural diagram of the zoom lens 100 according to Example 1 of the present application when it is at the wide-angle end. Figure 1B 1 is a schematic structural diagram of the zoom lens 100 according to Embodiment 1 of the present application when it is at the telephoto end.

[0106] like Figure 1A and Figure 1B As shown, the zoom lens 100 includes, from the object side to the image side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with negative refractive power, and an imaging surface IMA.

[0107] The first lens group G1 comprises first lens L1, second lens L2, and third lens L3. First lens L1 has positive optical power, with a convex object-side surface S1 and a convex image-side surface S2. Second lens L2 has negative optical power, with a concave object-side surface S2 and a convex image-side surface S3. Third lens L3 has positive optical power, with a convex object-side surface S4 and a concave image-side surface S5. First lens L1 and second lens L2 are cemented together to form a doublet.

[0108] The second lens group G2 includes the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7. The fourth lens L4 may have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens L5 may have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens L6 may have positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The seventh lens L7 may have negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The fifth lens L5 and the sixth lens L6 are cemented together to form a doublet.

[0109] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. The eighth lens L8 may have positive refractive power, with its object-side surface S14 being convex and its image-side surface S15 being concave. The ninth lens L9 may have positive refractive power, with its object-side surface S16 being convex and its image-side surface S17 being convex. The tenth lens L10 may have negative refractive power, with its object-side surface S17 being concave and its image-side surface S18 being concave. The eleventh lens L11 may have positive refractive power, with its object-side surface S18 being convex and its image-side surface S19 being concave. The twelfth lens L12 may have positive refractive power, with its object-side surface S20 being convex and its image-side surface S21 being convex. The thirteenth lens L13 may have negative refractive power, with its object-side surface S22 being concave and its image-side surface S23 being concave. The ninth lens L9, the tenth lens L10 and the eleventh lens L11 are cemented together to form a triplet lens.

[0110] The fourth lens group G4 includes a fourteenth lens L14, a fifteenth lens L15, and a sixteenth lens L16. Fourteenth lens L14 has positive refractive power, with its object-side surface S24 being convex and its image-side surface S25 being convex. Fifteenth lens L15 has positive refractive power, with its object-side surface S26 being concave and its image-side surface S27 being convex. Sixteenth lens L16 has negative refractive power, with its object-side surface S28 being concave and its image-side surface S29 being concave.

[0111] The fifth lens group G5 includes a seventeenth lens L17 having negative refractive power, a convex object-side surface S30 and a concave image-side surface S31 .

[0112] The zoom lens 100 may further include an aperture stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens element L7 and the eighth lens element L8. Optionally, the zoom lens 100 may further include a filter (not shown) having a first side surface and a second side surface, and / or a cover glass CG having a first side surface S32 and a second side surface S33. Light from an object sequentially passes through each of the surfaces S1 to S33 and is ultimately imaged on the imaging surface IMA. An image sensor chip may be disposed on the imaging surface IMA.

[0113] Table 1 shows basic parameters of the zoom lens 100 of Example 1, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0114] Table 1

[0115]

[0116]

[0117] In Example 1 and the following embodiments, by changing the position of the second lens group G2 on the optical axis, the zoom lens can be switched from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, so that the total effective focal length of the zoom lens is continuously variable. At the same time, by adjusting the position of the fourth lens group G4 on the optical axis, the image plane of the zoom lens can be clearly focused during the zooming process.

[0118] Table 2 shows the values ​​of T0, T1, T2, and T3 in Table 1 when the zoom lens 100 is at the wide-angle and telephoto ends, respectively. Table 2 also shows the values ​​of the total effective focal length F, aperture number Fno, and optical distortion DIS of the zoom lens 100 of Example 1 when it is at the wide-angle and telephoto ends, respectively. F and DIS change as the zoom lens 100 switches from the wide-angle end to the telephoto end, or vice versa, while Fno remains unchanged. The units of T0, T1, T2, T3, and F in Table 2 are all millimeters (mm).

[0119] Table 2

[0120] Wide-angle end Telephoto end F 15(Fw) 36.5 (Ft) Fno 1.6 1.6 DIS -5.38％ 3.3％ T0 0.94 22.23 T1 26.9 5.61 T2 3.37 1.65 T3 2.61 4.33

[0121] In Example 1, the object-side surface and the image-side surface of the twelfth lens L12, the thirteenth lens L13, the fifteenth lens L15, the sixteenth lens L16, and the seventeenth lens L17 are all aspherical surfaces. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0122]

[0123] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below shows the conic coefficient k and the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 and A 16 .

[0124] Table 3

[0125] Face number k A4 A6 A8 A10 A12 A14 A16 S20 -3.76 -2.41E-05 -5.65E-07 5.25E-09 -1.96E-11 1.50E-13 -1.27E-14 -3.61E-17 S21 -74.70 -8.50E-05 -2.88E-06 4.07E-08 1.25E-10 -5.65E-12 -1.91E-14 5.20E-16 S22 61.80 6.79E-07 -2.72E-06 2.52E-08 1.37E-11 5.90E-12 -1.71E-13 1.34E-15 S23 -10.60 1.79E-04 -5.09E-07 -6.68E-09 -3.80E-10 1.69E-11 -1.94E-13 1.21E-15 S26 89.30 -2.87E-04 -2.55E-06 2.33E-08 4.31E-10 -1.04E-11 -2.80E-13 5.39E-15 S27 18.80 -2.56E-04 -3.31E-06 1.22E-08 6.55E-10 1.02E-12 -2.47E-13 2.76E-15 S28 -26.20 3.15E-04 -3.69E-06 -7.23E-08 -1.13E-10 1.37E-11 3.80E-13 -4.23E-15 S29 14.30 3.27E-04 -1.92E-06 -2.11E-08 -2.97E-09 -4.08E-12 1.65E-12 -1.58E-14 S30 0.70 -7.62E-04 -4.29E-06 -6.68E-08 1.20E-08 -5.14E-10 9.30E-12 -7.19E-14 S31 0.19 -7.62E-04 -1.26E-05 5.21E-07 -1.56E-08 2.69E-10 -2.94E-12 1.28E-14

[0126] Figure 1C and Figure 1D The following are the distortion diagrams of the zoom lens 100 according to Example 1 of the present application when it is at the wide-angle end and the telephoto end. Figure 1C and Figure 1D It can be seen that the zoom lens 100 provided in Example 1 can achieve good imaging quality at different focal lengths.

[0127] Example 2

[0128] The following reference Figures 2A to 2D A zoom lens 200 according to Embodiment 2 of the present application will be described. Figure 2A is a structural diagram of the zoom lens 200 according to Embodiment 2 of the present application when it is at the wide-angle end. Figure 2B 2 is a schematic structural diagram of the zoom lens 200 according to Embodiment 2 of the present application when it is at the telephoto end.

[0129] In this embodiment and the following embodiments, some descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity.

[0130] like Figure 2A and Figure 2B As shown, the zoom lens 200 includes, from the object side to the image side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with negative refractive power, and an imaging surface IMA.

[0131] The first lens group G1 comprises first lens L1, second lens L2, and third lens L3. First lens L1 has positive optical power, with a convex object-side surface S1 and a convex image-side surface S2. Second lens L2 has negative optical power, with a concave object-side surface S2 and a convex image-side surface S3. Third lens L3 has positive optical power, with a convex object-side surface S4 and a concave image-side surface S5. First lens L1 and second lens L2 are cemented together to form a doublet.

[0132] The second lens group G2 includes fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7. Fourth lens L4 may have negative optical power, with its object-side surface S6 being concave and its image-side surface S7 being concave. Fifth lens L5 may have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. Sixth lens L6 may have positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. Seventh lens L7 may have negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. Fifth lens L5, sixth lens L6, and seventh lens L7 are cemented together to form a doublet.

[0133] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. The eighth lens L8 may have positive refractive power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The ninth lens L9 may have positive refractive power, with its object-side surface S15 being convex and its image-side surface S16 being convex. The tenth lens L10 may have negative refractive power, with its object-side surface S16 being concave and its image-side surface S17 being concave. The eleventh lens L11 may have positive refractive power, with its object-side surface S17 being convex and its image-side surface S18 being concave. The twelfth lens L12 may have positive refractive power, with its object-side surface S19 being convex and its image-side surface S20 being convex. The thirteenth lens L13 may have negative refractive power, with its object-side surface S21 being concave and its image-side surface S22 being concave. The ninth lens L9, the tenth lens L10 and the eleventh lens L11 are cemented together to form a triplet lens.

[0134] The fourth lens group G4 includes a fourteenth lens L14, a fifteenth lens L15, and a sixteenth lens L16. Fourteenth lens L14 has positive refractive power, with its object-side surface S23 being convex and its image-side surface S24 being convex. Fifteenth lens L15 has positive refractive power, with its object-side surface S25 being concave and its image-side surface S26 being convex. Sixteenth lens L16 has negative refractive power, with its object-side surface S27 being concave and its image-side surface S28 being concave.

[0135] The fifth lens group G5 includes a seventeenth lens L17 having negative refractive power, a convex object-side surface S29 and a concave image-side surface S30.

[0136] The zoom lens 200 may further include an aperture stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens element L7 and the eighth lens element L8. Optionally, the zoom lens 100 may further include a filter (not shown) having a first side surface and a second side surface and / or a cover glass CG having a first side surface S31 and a second side surface S32. Light from an object sequentially passes through each of the surfaces S1 to S32 and is ultimately imaged on the imaging surface IMA. An image sensor chip may be disposed on the imaging surface IMA.

[0137] Table 4 shows basic parameters of the zoom lens 200 of Example 2, where the units of curvature radius and thickness / distance are all millimeters (mm).

[0138] Table 4

[0139]

[0140]

[0141] Table 5 shows the values ​​of T0, T1, T2, and T3 in Table 4 when the zoom lens 200 is at the wide-angle end and the telephoto end, respectively. Table 5 also shows the values ​​of the total effective focal length F, aperture number Fno, and optical distortion DIS of the zoom lens 200 of Example 2 when it is at the wide-angle end and the telephoto end, respectively. F and DIS change as the zoom lens 200 switches from the wide-angle end to the telephoto end or vice versa, while Fno remains unchanged. The units of T0, T1, T2, T3, and F in Table 5 are all millimeters (mm).

[0142] Table 5

[0143] Wide-angle end Telephoto end F 17(Fw) 38 (Ft) Fno 1.6 1.6 DIS -3.96％ 3.05％ T0 1.12 22.19 T1 27.37 6.30 T2 3.04 4.19 T3 2.1 0.95

[0144] Table 6 shows the conic coefficient k and the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 and A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0145] Table 6

[0146]

[0147]

[0148] Figure 2C and Figure 2D The following are distortion diagrams of the zoom lens 200 according to Example 2 of the present application when it is at the wide-angle end and the telephoto end. Figure 2C and Figure 2D It can be seen that the zoom lens 200 provided in Example 2 can achieve good imaging quality at different focal lengths.

[0149] Example 3

[0150] The following reference Figures 3A to 3D A zoom lens 300 according to Embodiment 3 of the present application will be described. Figure 3A is a structural diagram of the zoom lens 300 according to Example 3 of the present application when it is at the wide-angle end. Figure 3B 3 is a schematic structural diagram of the zoom lens 300 according to Example 3 of the present application when it is at the telephoto end.

[0151] like Figure 3A and Figure 3BAs shown, the zoom lens 300 includes, from the object side to the image side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with negative refractive power, and an imaging surface IMA.

[0152] The first lens group G1 comprises first lens L1, second lens L2, and third lens L3. First lens L1 has positive optical power, with a convex object-side surface S1 and a convex image-side surface S2. Second lens L2 has negative optical power, with a concave object-side surface S2 and a convex image-side surface S3. Third lens L3 has positive optical power, with a convex object-side surface S4 and a concave image-side surface S5. First lens L1 and second lens L2 are cemented together to form a doublet.

[0153] The second lens group G2 includes the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7. The fourth lens L4 may have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens L5 may have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens L6 may have positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The seventh lens L7 may have negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The fifth lens L5 and the sixth lens L6 are cemented together to form a doublet.

[0154] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. The eighth lens L8 may have positive refractive power, with its object-side surface S14 being convex and its image-side surface S15 being concave. The ninth lens L9 may have positive refractive power, with its object-side surface S16 being convex and its image-side surface S17 being convex. The tenth lens L10 may have negative refractive power, with its object-side surface S17 being concave and its image-side surface S18 being concave. The eleventh lens L11 may have positive refractive power, with its object-side surface S18 being convex and its image-side surface S19 being concave. The twelfth lens L12 may have positive refractive power, with its object-side surface S20 being convex and its image-side surface S21 being convex. The thirteenth lens L13 may have negative refractive power, with its object-side surface S22 being concave and its image-side surface S23 being concave. The ninth lens L9, the tenth lens L10 and the eleventh lens L11 are cemented together to form a triplet lens.

[0155] The fourth lens group G4 includes a fourteenth lens L14, a fifteenth lens L15, and a sixteenth lens L16. Fourteenth lens L14 has positive refractive power, with its object-side surface S24 being convex and its image-side surface S25 being convex. Fifteenth lens L15 has positive refractive power, with its object-side surface S26 being concave and its image-side surface S27 being convex. Sixteenth lens L16 has negative refractive power, with its object-side surface S28 being concave and its image-side surface S29 being concave.

[0156] The fifth lens group G5 includes a seventeenth lens L17 having negative refractive power, a convex object-side surface S30 and a concave image-side surface S31 .

[0157] The zoom lens 100 may further include an aperture stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens element L7 and the eighth lens element L8. Optionally, the zoom lens 100 may further include a filter (not shown) having a first side surface and a second side surface, and / or a cover glass CG having a first side surface S32 and a second side surface S33. Light from an object sequentially passes through each of the surfaces S1 to S33 and is ultimately imaged on the imaging surface IMA. An image sensor chip may be disposed on the imaging surface IMA.

[0158] Table 7 shows basic parameters of the zoom lens 300 of Example 3, where the units of curvature radius and thickness / distance are all millimeters (mm).

[0159] Table 7

[0160]

[0161]

[0162] Table 8 shows the values ​​of T0, T1, T2, and T3 in Table 7 when the zoom lens 300 is at the wide-angle end and the telephoto end, respectively. Table 8 also shows the values ​​of the total effective focal length F, aperture number Fno, and optical distortion DIS of the zoom lens 300 of Example 3 when it is at the wide-angle end and the telephoto end, respectively. F and DIS change as the zoom lens 300 switches from the wide-angle end to the telephoto end or vice versa, while Fno remains unchanged. In Table 8, T0, T1, T2, T3, and F are all in millimeters (mm), and FOV is in degrees (°).

[0163] Table 8

[0164] Wide-angle end Telephoto end F 15(Fw) 36(Ft) Fno 1.6 1.6 DIS -5.5％ 2.57％ T0 0.71 22.21 T1 27.13 5.63 T2 2.67 1.72 T3 3.62 4.57

[0165] Table 9 shows the conic coefficient k and the high-order coefficients A4, A6, A8, A 10 、A 12 、A14 and A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0166] Table 9

[0167] Face number k A4 A6 A8 A10 A12 A14 A16 S20 -3.47 -2.29E-05 -5.68E-07 5.12E-09 -2.20E-11 1.11E-13 -1.33E-14 -4.24E-17 S21 -37.80 -8.59E-05 -2.88E-06 4.07E-08 1.25E-10 -5.65E-12 -1.94E-14 5.02E-16 S22 32.00 1.41E-06 -2.73E-06 2.50E-08 1.11E-11 5.88E-12 -1.71E-13 1.36E-15 S23 -11.40 1.77E-04 -4.99E-07 -6.54E-09 -3.81E-10 1.68E-11 -1.98E-13 1.12E-15 S26 53.40 -2.86E-04 -2.57E-06 2.30E-08 4.28E-10 -1.04E-11 -2.78E-13 5.44E-15 S27 18.60 -2.56E-04 -3.28E-06 1.26E-08 6.59E-10 1.03E-12 -2.47E-13 2.79E-15 S28 -59.90 3.17E-04 -3.71E-06 -7.29E-08 -1.17E-10 1.38E-11 3.83E-13 -4.26E-15 S29 14.20 3.23E-04 -1.85E-06 -1.93E-08 -2.96E-09 -4.71E-12 1.63E-12 -1.61E-14 S30 0.72 -7.48E-04 -4.39E-06 -7.04E-08 1.20E-08 -5.15E-10 9.27E-12 -7.32E-14 S31 0.14 -7.28E-04 -1.24E-05 5.19E-07 -1.56E-08 2.67E-10 -2.94E-12 1.37E-14

[0168] Figure 3C and Figure 3D The following are the distortion diagrams of the zoom lens 300 according to Example 3 of the present application when it is at the wide-angle end and the telephoto end. Figure 3C and Figure 3D It can be seen that the zoom lens 300 provided in Example 3 can achieve good imaging quality at different focal lengths.

[0169] Example 4

[0170] The following reference Figures 4A to 4D A zoom lens 400 according to Embodiment 4 of the present application will be described. Figure 4A is a structural diagram of the zoom lens 400 according to Example 4 of the present application when it is at the wide-angle end. Figure 4B 4 is a schematic structural diagram of the zoom lens 400 according to Example 4 of the present application when it is at the telephoto end.

[0171] like Figure 4A and Figure 4B As shown, the zoom lens 400 includes, from the object side to the image side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with negative refractive power, and an imaging surface IMA.

[0172] The first lens group G1 comprises first lens L1, second lens L2, and third lens L3. First lens L1 has positive optical power, with a convex object-side surface S1 and a convex image-side surface S2. Second lens L2 has negative optical power, with a concave object-side surface S2 and a convex image-side surface S3. Third lens L3 has positive optical power, with a convex object-side surface S4 and a concave image-side surface S5. First lens L1 and second lens L2 are cemented together to form a doublet.

[0173] The second lens group G2 includes fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7. Fourth lens L4 may have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. Fifth lens L5 may have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. Sixth lens L6 may have positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. Seventh lens L7 may have negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. Fifth lens L5, sixth lens L6, and seventh lens L7 are cemented together to form a doublet.

[0174] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. The eighth lens L8 may have positive refractive power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The ninth lens L9 may have positive refractive power, with its object-side surface S15 being convex and its image-side surface S16 being convex. The tenth lens L10 may have negative refractive power, with its object-side surface S16 being concave and its image-side surface S17 being concave. The eleventh lens L11 may have positive refractive power, with its object-side surface S17 being convex and its image-side surface S18 being concave. The twelfth lens L12 may have positive refractive power, with its object-side surface S19 being convex and its image-side surface S20 being convex. The thirteenth lens L13 may have negative refractive power, with its object-side surface S21 being concave and its image-side surface S22 being concave. The ninth lens L9, the tenth lens L10 and the eleventh lens L11 are cemented together to form a triplet lens.

[0175] The fourth lens group G4 includes a fourteenth lens L14, a fifteenth lens L15, and a sixteenth lens L16. Fourteenth lens L14 has positive refractive power, with its object-side surface S23 being convex and its image-side surface S24 being convex. Fifteenth lens L15 has positive refractive power, with its object-side surface S25 being concave and its image-side surface S26 being convex. Sixteenth lens L16 has negative refractive power, with its object-side surface S27 being concave and its image-side surface S28 being concave.

[0176] The fifth lens group G5 includes a seventeenth lens L17 having negative refractive power, a convex object-side surface S29 and a concave image-side surface S30.

[0177] The zoom lens 400 may further include an aperture stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens element L7 and the eighth lens element L8. Optionally, the zoom lens 100 may further include a filter (not shown) having a first side surface and a second side surface and / or a cover glass CG having a first side surface S31 and a second side surface S32. Light from an object sequentially passes through each of the surfaces S1 to S32 and is ultimately imaged on the imaging surface IMA. An image sensor chip may be disposed on the imaging surface IMA.

[0178] Table 10 shows basic parameters of the zoom lens 400 of Example 4, where the units of curvature radius and thickness / distance are all millimeters (mm).

[0179] Table 10

[0180]

[0181] Table 11 shows the values ​​of T0, T1, T2, and T3 in Table 10 when the zoom lens 400 is at the wide-angle end and the telephoto end, respectively. Table 11 also shows the values ​​of the total effective focal length F, aperture number Fno, and optical distortion DIS of the zoom lens 400 of Example 4 when it is at the wide-angle end and the telephoto end, respectively. F and DIS change as the zoom lens 400 switches from the wide-angle end to the telephoto end, or vice versa, while Fno remains unchanged. The units of T0, T1, T2, T3, and F in Table 11 are all millimeters (mm).

[0182] Table 11

[0183]

[0184]

[0185] Table 12 shows the conic coefficient k and the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 and A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0186] Table 12

[0187] Face number k A4 A6 A8 A10 A12 A14 A16 S19 -4.77 -2.77E-05 -5.45E-07 5.57E-09 -1.54E-11 1.74E-13 -1.15E-14 -2.96E-17 S20 -181.13 -8.41E-05 -2.91E-06 4.06E-08 1.26E-10 -5.65E-12 -1.98E-14 5.18E-16 S21 174.39 4.49E-07 -2.70E-06 2.49E-08 1.04E-12 5.80E-12 -1.71E-13 1.32E-15 S22 -9.91 1.78E-04 -5.90E-07 -6.16E-09 -3.60E-10 1.70E-11 -2.00E-13 1.00E-15 S25 6.92 -2.82E-04 -2.35E-06 2.53E-08 4.21E-10 -1.12E-11 -2.95E-13 5.28E-15 S26 19.10 -2.58E-04 -3.29E-06 1.31E-08 6.81E-10 1.39E-12 -2.48E-13 2.51E-15 S27 44.27 3.11E-04 -3.51E-06 -6.56E-08 -2.39E-11 1.40E-11 3.61E-13 -4.63E-15 S28 14.32 2.94E-04 -1.17E-06 -2.14E-08 -3.18E-09 -4.47E-12 1.76E-12 -1.23E-14 S29 0.71 -7.63E-04 -4.40E-06 -5.67E-08 1.25E-08 -5.06E-10 9.36E-12 -7.41E-14 S30 0.59 -7.13E-04 -1.16E-05 5.64E-07 -1.49E-08 2.73E-10 -3.07E-12 5.52E-15

[0188] Figure 4C and Figure 4D The following are the distortion diagrams of the zoom lens 400 according to Example 4 of the present application when it is at the wide-angle end and the telephoto end. Figure 4C and Figure 4DIt can be seen that the zoom lens 400 provided in Example 4 can achieve good imaging quality at different focal lengths.

[0189] Example 5

[0190] The following reference 5A to 5D A zoom lens 500 according to Embodiment 5 of the present application will be described. Figure 5A is a structural diagram of a zoom lens 500 according to Embodiment 5 of the present application when at a wide-angle end. Figure 5B 3 is a schematic structural diagram of the zoom lens 500 according to Example 5 of the present application when it is at the telephoto end.

[0191] like Figure 5A and Figure 5B As shown, the zoom lens 500 includes, from the object side to the image side, a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with positive refractive power, a fifth lens group G5 with positive refractive power, and an imaging surface IMA.

[0192] The first lens group G1 comprises first lens L1, second lens L2, and third lens L3. First lens L1 has positive optical power, with a convex object-side surface S1 and a convex image-side surface S2. Second lens L2 has negative optical power, with a concave object-side surface S2 and a convex image-side surface S3. Third lens L3 has positive optical power, with a convex object-side surface S4 and a concave image-side surface S5. First lens L1 and second lens L2 are cemented together to form a doublet.

[0193] The second lens group G2 includes fourth lens L4, fifth lens L5, sixth lens L6, and seventh lens L7. Fourth lens L4 may have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. Fifth lens L5 may have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. Sixth lens L6 may have positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. Seventh lens L7 may have negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. Fifth lens L5, sixth lens L6, and seventh lens L7 are cemented together to form a doublet.

[0194] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. The eighth lens L8 may have positive refractive power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The ninth lens L9 may have positive refractive power, with its object-side surface S15 being convex and its image-side surface S16 being convex. The tenth lens L10 may have negative refractive power, with its object-side surface S16 being concave and its image-side surface S17 being concave. The eleventh lens L11 may have positive refractive power, with its object-side surface S17 being convex and its image-side surface S18 being concave. The twelfth lens L12 may have positive refractive power, with its object-side surface S19 being convex and its image-side surface S20 being convex. The thirteenth lens L13 may have negative refractive power, with its object-side surface S21 being concave and its image-side surface S22 being concave. The ninth lens L9, the tenth lens L10 and the eleventh lens L11 are cemented together to form a triplet lens.

[0195] The fourth lens group G4 includes a fourteenth lens L14, a fifteenth lens L15, and a sixteenth lens L16. Fourteenth lens L14 has positive refractive power, with its object-side surface S23 being convex and its image-side surface S24 being convex. Fifteenth lens L15 has positive refractive power, with its object-side surface S25 being concave and its image-side surface S26 being convex. Sixteenth lens L16 has negative refractive power, with its object-side surface S27 being concave and its image-side surface S28 being concave.

[0196] The fifth lens group G5 includes a seventeenth lens L17 having positive refractive power, a convex object-side surface S29 and a concave image-side surface S30.

[0197] The zoom lens 500 may further include an aperture stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture stop STO may be disposed between the seventh lens element L7 and the eighth lens element L8. Optionally, the zoom lens 100 may further include a filter (not shown) having a first side surface and a second side surface and / or a cover glass CG having a first side surface S31 and a second side surface S32. Light from an object sequentially passes through each of the surfaces S1 to S32 and is ultimately imaged on the imaging surface IMA. An image sensor chip may be disposed on the imaging surface IMA.

[0198] Table 13 shows basic parameters of the zoom lens 500 of Example 5, where the units of curvature radius and thickness / distance are all millimeters (mm).

[0199] Table 13

[0200]

[0201]

[0202] Table 14 shows the values ​​of T0, T1, T2, and T3 in Table 10 when the zoom lens 500 is at the wide-angle end and the telephoto end, respectively. Table 14 also shows the values ​​of the total effective focal length F, aperture number Fno, and optical distortion DIS of the zoom lens 500 of Example 5 when it is at the wide-angle end and the telephoto end, respectively. F and DIS change as the zoom lens 500 switches from the wide-angle end to the telephoto end, or vice versa, while Fno remains unchanged. The units of T0, T1, T2, T3, and F in Table 14 are all millimeters (mm).

[0203] Table 14

[0204] Wide-angle end Telephoto end F 12.95(Fw) 30(Ft) Fno 1.6 1.6 DIS -1.87％ 4.18％ T0 0.20 21.94 T1 28.29 6.55 T2 4.30 0.96 T3 0.45 3.78

[0205] Table 15 shows the conic coefficient k and the high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 and A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0206] Table 15

[0207]

[0208]

[0209] Figure 5C and Figure 5D The following are the distortion diagrams of the zoom lens 500 according to Example 5 of the present application when it is at the wide-angle end and the telephoto end. Figure 5C and Figure 5D It can be seen that the zoom lens 500 provided in Example 5 can achieve good imaging quality at different focal lengths.

[0210] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 16.

[0211] Table 16

[0212] Conditional formula / Example 1 2 3 4 5 3.7≤FG1 / Fw≤6.2 4.73 4.02 4.70 6.12 6.00 -1.8≤FG2 / Fw≤-1.4 -1.48 -1.54 -1.54 -1.71 -1.76 1.56≤FG3 / Fw≤2.3 1.83 1.66 1.98 2.13 2.24 2.23≤FG4 / Fw≤3 2.48 2.89 2.33 2.64 2.76 7.9≤|FG5 / Fw|≤32.5 7.95 19.11 9.96 32.03 10.02 1.6≤D2 / IH≤1.7 1.66 1.65 1.68 1.69 1.70 4.16≤TTL / D2≤4.37 4.23 4.27 4.19 4.34 4.32 1.1≤D2 / Fw≤1.8 1.42 1.24 1.43 1.67 1.68 0.18≤TG4 / FG4≤0.31 0.24 0.20 0.25 0.29 0.28 0.34≤Ft / FG1≤0.6 0.51 0.56 0.51 0.38 0.39 1.46≤f8 / FG3≤2.5 1.69 1.61 1.91 2.23 2.39 6.98≤TTL / IH≤7.4 7.03 7.03 7.03 7.34 7.34 36.4≤TTL / (Ft / Fw)≤41.4 36.99 40.28 37.50 40.73 40.62 2.58≤(f12-f13) / FG3≤3.24 2.84 2.65 2.63 2.80 2.70 1.41≤f1 / FG1≤1.6 1.44 1.48 1.45 1.53 1.58 2.0≤Ft / Fw≤2.5 2.43 2.23 2.40 2.31 2.31

[0213] The above description is merely a preferred embodiment of the present application and an illustration 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 the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zoom lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens group having positive optical power, wherein the first lens group is a fixed group; a second lens group having negative optical power, wherein the second lens group is a zoom group; a third lens group having positive optical power, wherein the third lens group is a fixed group; a fourth lens group having positive optical power, the fourth lens group being a compensation group; and a fifth lens group having positive or negative optical power, wherein the fifth lens group is a fixed group; in, The first lens group includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, and a third lens; The second lens group includes, in order from the object side to the image side along the optical axis: a fourth lens, a fifth lens, a sixth lens, and a seventh lens; The third lens group includes, in order from the object side to the image side along the optical axis: an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens, wherein the twelfth lens has positive refractive power, and the thirteenth lens has negative refractive power; The fourth lens group includes, in order from the object side to the image side along the optical axis: a fourteenth lens, a fifteenth lens, and a sixteenth lens, wherein the fifteenth lens has positive refractive power, and the sixteenth lens has negative refractive power; The fifth lens group includes: a seventeenth lens; The second lens group moves along the optical axis between the object side and the image side to achieve continuous zooming between a wide-angle end and a telephoto end; The fourth lens group moves along the optical axis between the object side and the image side to compensate for changes in image plane position during zooming.

2. The zoom lens according to claim 1, wherein: The first lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The second lens has negative optical power, its object side surface is concave, and its image side surface is convex; The third lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The fourth lens has negative optical power and its image side surface is concave; The fifth lens has negative optical power, and its object-side surface and image-side surface are concave; The sixth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The seventh lens has negative optical power, and its object-side surface and image-side surface are concave; The eighth lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave; The ninth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The tenth lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The eleventh lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The object-side surface of the twelfth lens is convex, and the image-side surface is convex; The image side surface of the thirteenth lens is concave, and the image side surface is concave; The fourteenth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The object-side surface of the fifteenth lens is concave, and the image-side surface is convex; The object-side surface of the sixteenth lens is concave, and the image-side surface is concave; The seventeenth lens has positive or negative refractive power, an object-side surface thereof is convex, and an image-side surface thereof is concave.

3. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies at least one of the following conditions: 3.7≤FG1 / Fw≤6.2, 0.34≤Ft / FG1≤0.6, 1.41≤f1 / FG1≤1.6, wherein FG1 is the effective focal length of the first lens group, Fw is the total effective focal length of the zoom lens at the wide-angle end, Ft is the total effective focal length of the zoom lens at the telephoto end, and f1 is the effective focal length of the first lens.

4. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies at least one of the following conditions: -1.8≤FG2 / Fw≤-1.4, 1.6≤D2 / IH≤1.7, 4.16≤TTL / D2≤4.37, 1.1≤D2 / Fw≤1.8, where FG2 is the effective focal length of the second lens group, Fw is the total effective focal length when the zoom lens is at the wide-angle end, D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, IH is the maximum image height of the zoom lens, and TTL is the on-axis distance from the object-side surface of the first lens to the imaging plane of the zoom lens.

5. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies at least one of the following conditions: 1.56≤FG3 / Fw≤2.3,50≤Vd G3 ≤75, 1.46≤f8 / FG3≤2.5, 2.58≤(f12-f13) / FG3≤3.24, where FG3 is the effective focal length of the third lens group, Fw is the total effective focal length of the zoom lens at the wide-angle end, Vd G3 is the Abbe number of at least one lens in the third lens group, f8 is the effective focal length of the eighth lens, f12 is the effective focal length of the twelfth lens, and f13 is the effective focal length of the thirteenth lens.

6. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies at least one of the following conditions: 2.23≤FG4 / Fw≤3, 0.18≤TG4 / FG4≤0.31, wherein FG4 is the effective focal length of the fourth lens group, Fw is the total effective focal length of the zoom lens at the wide-angle end, and TG4 is the thickness of the fourth lens group on the optical axis.

7. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies the following: 7.9≤|FG5 / Fw|≤32.5, wherein FG5 is the effective focal length of the fifth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

8. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies the following: 6.98≤TTL / IH≤7.4, wherein TTL is the on-axis distance from the object-side surface of the first lens to the imaging surface of the zoom lens, and IH is the maximum image height of the zoom lens.

9. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies the following conditions: 36.4≤TTL / (Ft / Fw)≤41.4, 2.0≤Ft / Fw≤2.5, where TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the zoom lens, Ft is the total effective focal length of the zoom lens at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

10. The zoom lens according to claim 1 or 2, wherein: The zoom lens satisfies at least one of the following conditions: 3.95≤FG1 / Fw≤6.2, -1.8≤FG2 / Fw≤-1.45, 1.6≤FG3 / Fw≤2.3, 2.3≤FG4 / Fw≤2.9, 7.9≤|FG5 / Fw|≤32.1, 1.65≤D2 / IH≤1.7, 4.15≤TTL / D2≤4.37, 1.2≤D2 / Fw≤1.7, 1.6≤f8 / FG3≤2.42, 7≤TTL / IH≤7.4, 36.9≤TTL / (Ft / Fw)≤40.75, 2.6≤(f12-f13) / FG3≤2.9, 2.2≤Ft / Fw≤2.5, Wherein, FG1 is the effective focal length of the first lens group, FG2 is the effective focal length of the second lens group, FG3 is the effective focal length of the third lens group, FG4 is the effective focal length of the fourth lens group, FG5 is the effective focal length of the fifth lens group, Fw is the total effective focal length of the zoom lens at the wide-angle end, D2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end, IH is the maximum image height of the zoom lens, TTL is the on-axis distance from the object-side surface of the first lens to the imaging plane of the zoom lens, Ft is the total effective focal length of the zoom lens at the telephoto end, f8 is the effective focal length of the eighth lens, f12 is the effective focal length of the twelfth lens, and f13 is the effective focal length of the thirteenth lens.

Images