Zoom lens

Abstract

The invention 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 the advancement of science and technology, zoom optical systems have been widely used in various aspects of life, such as security monitoring, intelligent transportation, etc. The use of zoom lenses has increased year by year, so the requirements for the optical performance and product stability of zoom lenses have also become higher and higher.

[0004] However, the following problems still exist in the existing zoom lenses: 1) The imaging target surface size of the existing zoom lenses is small, and the resolution of the collected images is low; 2) The aperture of the existing zoom lenses is small and changes during the zooming process, 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 for the entire camera; 4) The focus of the existing zoom lenses drifts in high and low temperature environments, and the imaging effect is easily seriously affected by the environment; 5) The existing zoom lenses have large distortion, which causes the surrounding people or scenes captured to be deformed, and the scene cannot be truly restored.

[0005] Therefore, designing a zoom lens with at least one of the following characteristics: large target surface, 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 for researchers in this field. Summary of the invention

[0006] The present application provides such a zoom lens, which includes, 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 lens group, the third lens group, and the fifth lens group are fixed groups, the second lens group is a zoom group, and the fourth lens group is a compensation group. Among them, the first lens group includes, 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, 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, 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, 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, from the object side to the image side, 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 the wide-angle end and the telephoto end; the fourth lens group moves along the optical axis between the object side and the image side to achieve compensation 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 of the fifth lens is concave, and the image side surface is concave; the object side surface of the sixth lens is convex, and the image side surface is convex; the object side surface of the seventh lens is concave, and the image side surface is 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; the eleventh lens has positive optical power; the twelfth lens has positive optical power; and the thirteenth lens has negative 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; 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 power; the fifteenth lens has positive power; and the sixteenth lens has negative 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, wherein 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, wherein 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, wherein 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, wherein 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, 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.

[0022] In one embodiment, the zoom lens satisfies: 1.6≤D2 / IH≤1.7, wherein 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: 4.16≤TTL / D2≤4.37, 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 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: 1.1≤D2 / Fw≤1.8, wherein 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, wherein 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, wherein 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, wherein f8 is the effective focal length of the eighth lens, 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, wherein TTL is the axial 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: 36.4≤TTL / (Ft / Fw)≤41.4, wherein TTL is the axial 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 when the zoom lens is at the telephoto end, and Fw is the total effective focal length when the zoom lens is at the wide-angle end.

[0031] In one embodiment, the zoom lens satisfies: 2.58≤(f12-f13) / FG3≤3.24, wherein 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, wherein 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, -1.80≤FG2 / Fw≤-1.45, 1.6≤FG3 / Fw≤2.3, 2.4≤FG4 / Fw≤2.9, 7.9≤|FG5 / Fw|≤32.1, 1.65≤D2 / IH≤1.7, 4.2≤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≤2.95, 2.2≤Ft / Fw≤2.5, wherein FG1 is the 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 when the zoom lens is at the wide-angle end, D2 is the axial 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 axial 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 when the zoom lens is 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.

[0035] The zoom lens according to the present application adopts a five-group architecture of fixed + zoom + fixed + compensation + fixed. By reasonably setting the optical focal length and action 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, wide focus object distance range, constant aperture, small size, large target surface, low distortion, high resolution, infrared confocal, and no defocus 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 by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0037] Figure 1A and Figure 1BThey are schematic diagrams of the structure of the zoom lens at the wide-angle end and the telephoto end according to Embodiment 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;

[0039] Figure 2A and Figure 2B They are schematic structural diagrams of a zoom lens at a wide-angle end and a telephoto end according to Embodiment 2 of the present application;

[0040] Figure 2C and Figure 2D Distortion diagrams of the zoom lens according to Embodiment 2 of the present application when it is at the wide-angle end and the telephoto end respectively;

[0041] Figure 3A and Figure 3B They are schematic diagrams of the structure of a zoom lens at a wide-angle end and a telephoto end according to Embodiment 3 of the present application;

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

[0043] Figure 4A and Figure 4B They are schematic diagrams of the structures of a zoom lens at a wide-angle end and a telephoto end according to Embodiment 4 of the present application;

[0044] Figure 4C and Figure 4D 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 respectively;

[0045] Figure 5A and Figure 5B They are schematic structural diagrams of a zoom lens at a wide-angle end and a telephoto end according to Embodiment 5 of the present application;

[0046] Figure 5C and Figure 5D They 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 respectively. DETAILED DESCRIPTION

[0047] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only 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 expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

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

[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 type 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 radius of curvature of the paraxial area) is used to judge the concave and convex. 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 exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

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

[0053] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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] The zoom lens according to the exemplary embodiment of the present application 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 optical power or negative optical power. The 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 the tolerance sensitivity and ensuring the uniformity of the image.

[0057] In an exemplary embodiment, the second lens group has negative optical focal length and can be moved between the object side and the image side along the optical axis. 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 out-of-focus in high and low temperature environments.

[0059] In an exemplary embodiment, the fourth lens group has positive refractive power and is mainly responsible for compensating the change in the position of the image plane during zooming. The fourth lens group can move along the optical axis corresponding to the movement of the second lens group during the continuous zooming of the lens to compensate for the image plane, thereby ensuring the imaging quality of the lens body during continuous zooming.

[0060] In an exemplary embodiment, the fifth lens group has positive or negative optical power, which is beneficial to 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: a first lens, a second lens, and a third lens in order from the object side to the image side along the optical axis. 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, and its object side surface is convex and its image side surface is convex; the second lens may have negative optical power, and its object side surface is concave and its image side surface is convex; the third lens may have positive optical power, and its object side surface is convex and its image side surface is concave. The first lens is a positive convex-convex lens, the second lens is a negative concave-convex lens, and the third lens is a positive convex-concave lens. Two meniscus lenses are provided in the first lens group, which is conducive to the correction of field curvature at different object distances. The object side surface of the first lens is set to be convex and the image side surface is set to be concave, which is conducive to reducing the distortion of the optical system, so that the absolute value of the optical distortion DIS of the lens at the wide-angle end satisfies |DIS|≤|±5.5%|, and the optical distortion 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 chromatic aberration correction at the telephoto end of the lens.

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

[0064] In an exemplary embodiment, the second lens group may include a cemented lens, which is beneficial to balance the position chromatic aberration of the second lens group and improve the overall resolution of the optical system. Exemplarily, the fifth lens and the sixth lens may cooperate with each other to form a doublet lens. Exemplarily, the fifth lens, the sixth lens and the seventh lens may cooperate with each other to form a triplet lens.

[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, its object side surface is convex, and its image side surface is concave; the ninth lens has positive optical power, its object side surface is convex, and its image side surface is convex; the tenth lens has negative optical power, its object side surface is concave, and its image side surface is concave; the eleventh lens has positive optical power, its object side surface is convex, and its image side surface is concave; the twelfth lens has positive optical power, its object side surface is convex, and its image side surface is convex; the thirteenth lens has negative optical power, its object side surface is concave, and its image side surface is concave. Among them, the eighth lens is set as a meniscus lens with positive optical power, which is conducive to correcting 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 focal lengths of the ninth lens, the tenth lens and the eleventh lens are reasonably set so that they use positive and negative optical focal lengths to match each other, which is beneficial 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 make the light transition smoothly, effectively reduce the tolerance sensitivity of the third lens group, and can also reduce the angle of the outgoing light on the image side of the eleventh lens, effectively reduce the light height, and reduce the generation of aberrations.

[0067] In an exemplary embodiment, the twelfth lens with positive optical power and the thirteenth lens with negative optical power cooperate with each other to effectively control the trend of light, so that the light is transmitted smoothly, effectively reduce the tolerance sensitivity of the third lens group, and improve the production yield of the lens; at the same time, the thirteenth lens has a negative optical power, which is also 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 to correcting aberrations and improving the imaging performance of the lens.

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

[0069] In an exemplary embodiment, the fifth lens group may include a seventeenth lens having positive or negative power. The seventeenth lens may be configured as a convex-concave plastic lens, which is conducive to realizing a heat-free lens design and effectively controlling the trend of the light emitted from the seventeenth lens to better match the chip requirements of a large target surface; at the same time, it is conducive to balancing various aberrations of the optical system and improving 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. Exemplarily, the aperture stop may be disposed between the seventh lens and the eighth lens. However, it should be noted that the position of the aperture stop disclosed herein is merely an example and not a limitation; in alternative embodiments, the aperture stop may also be disposed at other positions according to actual needs.

[0071] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 3.7≤FG1 / Fw≤6.2, wherein 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. Satisfying 3.7≤FG1 / Fw≤6.2 and reasonably controlling the focal length of the first lens group and the total effective focal length of the zoom lens at the wide-angle end is conducive to converging large-angle incident light into the optical system, effectively expanding the field of view of the optical system.

[0072] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: -1.8≤FG2 / Fw≤-1.4, wherein 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. Satisfying -1.8≤FG2 / Fw≤-1.4 and reasonably controlling the focal length value of the second lens group is conducive to achieving imaging performance while ensuring the required zoom ratio during zooming.

[0073] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 1.56≤FG3 / Fw≤2.3, wherein 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. Satisfying 1.56≤FG3 / Fw≤2.3 and reasonably allocating the focal length value of the third lens group is conducive to the third lens group collecting the outgoing light of the second lens group, making the light transition smoothly, effectively reducing the generation of aberrations, and improving the optical imaging quality.

[0074] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 2.23≤FG4 / Fw≤3, wherein 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 2.4≤FG4 / Fw≤2.9. By satisfying 2.23≤FG4 / Fw≤3, the image plane is kept stable during the zooming process by reasonably controlling the focal length value of the fourth lens group, and the generation of spherical aberration during the entire zooming process can also be reduced to obtain high imaging performance; at the same time, the optical distortion can be effectively reduced, so that the absolute value of the optical distortion DIS of the optical lens at the wide-angle end satisfies |DIS|≤|±5.5%|, and the optical distortion DIS≤8.2% at the telephoto end, thereby achieving a low distortion effect.

[0075] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 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. More specifically, FG5 and Fw may further satisfy 7.9≤|FG5 / Fw|≤32.1. By satisfying 7.9≤|FG5 / Fw|≤32.5, by reasonably controlling the focal length value of the fifth lens group, the change of field curvature during the entire zooming process can be reduced, thereby improving the optical imaging quality.

[0076] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 1.6≤D2 / IH≤1.7, wherein 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, under the same image height, by controlling the moving distance of the second lens group, the length of the optical lens can be effectively limited, which is conducive to the miniaturization of the optical lens, so that the total optical length TTL of the zoom lens is less than 95 mm.

[0077] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 4.16≤TTL / D2≤4.37, wherein 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 of the first lens to the imaging surface of the zoom lens. More specifically, TTL and D2 may further satisfy 4.2≤TTL / D2≤4.37. Satisfying 4.16≤TTL / D2≤4.37 controls the ratio of the total optical length of the lens to the moving distance of the second lens group within a specific range, which is conducive to achieving a small volume while ensuring tolerance sensitivity, and at the same time improving the zoom response speed of the lens.

[0078] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 1.1≤D2 / Fw≤1.8, wherein 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. Satisfying 1.1≤D2 / Fw≤1.8 is conducive to reducing the aberrations generated between the first lens group and the second lens group, and can also control the volume of the lens and reduce the design cost.

[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 satisfies the range of the conditional expression is beneficial to effectively correct the chromatic aberration of the third lens group, thereby improving the imaging quality of the optical system.

[0080] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 0.18≤TG4 / FG4≤0.31, wherein TG4 is the thickness of the fourth lens group on the optical axis (i.e., the on-axis distance from the object side of the fourteenth lens to the image side of the sixteenth lens), and FG4 is the effective focal length of the fourth lens group. Satisfying 0.18≤TG4 / FG4≤0.31, by reasonably setting the ratio of the thickness of the fourth lens group and the focal length of the fourth lens group, the volume of the fourth lens group is small, which is conducive to miniaturization of the lens, and the total optical length TTL is less than 95 mm.

[0081] In the exemplary embodiment of the present application, the zoom lens according to the present application 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. Satisfying 0.34≤Ft / FG1≤0.6 is conducive to balancing various aberrations of the zoom lens at the telephoto end and improving the resolution.

[0082] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 1.46≤f8 / FG3≤2.5, wherein f8 is the effective focal length of the eighth lens, and FG3 is the effective focal length of the third lens group. More specifically, f8 and FG3 may further satisfy 1.6≤f8 / FG3≤2.42. By satisfying 1.46≤f8 / FG3≤2.5, the ratio of the focal length of the eighth lens to the focal length of the third lens group is reasonably controlled, so that the eighth lens has a light collecting effect, thereby ensuring the amount of light transmitted 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: 6.98≤TTL / IH≤7.4, wherein TTL is the on-axis distance from the object side of the first lens to the imaging surface of the zoom lens, and IH is the maximum image height of the zoom lens. More specifically, TTL and IH may further satisfy 7≤TTL / IH≤7.4. Satisfying 6.98≤TTL / IH≤7.4 and reasonably controlling the ratio of the image plane size of the lens to the total optical length of the lens within a specific range is conducive to achieving a small volume while ensuring image quality at full image height.

[0084] In an exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 36.4≤TTL / (Ft / Fw)≤41.4, wherein Ft is the total effective focal length of the zoom lens when it is at the telephoto end, Fw is the total effective focal length of the zoom lens when it is at the wide-angle end, and TTL is the on-axis distance from the object side of the first lens to the imaging surface 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 reasonably 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 conducive to achieving the beneficial effect of a small lens volume 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: 2.58≤(f12-f13) / FG3≤3.24, wherein 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≤2.95. Satisfying 2.58≤(f12-f13) / FG3≤3.24 and reasonably controlling the ratio of the difference between the effective focal lengths of the twelfth lens and the thirteenth lens to the effective focal length of the third lens group within a specific range is conducive to ensuring the athermalization of the zoom lens.

[0086] In the exemplary embodiment of the present application, the zoom lens according to the present application 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. Satisfying 1.41≤f1 / FG1≤1.6 and reasonably controlling the ratio of the effective focal length of the first lens to the effective focal length of the first lens group within a specific range is conducive to reasonably allocating the optical power of the first lens and reducing the front port diameter of the zoom lens.

[0087] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 2.0≤Ft / Fw≤2.5, wherein Ft is the total effective focal length of the zoom lens when it is at the telephoto end, and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end. More specifically, Ft and Fw may further satisfy 2.2≤Ft / Fw≤2.5. Satisfying 2.0≤Ft / Fw≤2.5, the ratio of the total effective focal length of the zoom lens when it is at the telephoto end and the wide-angle end is reasonably controlled, that is, the zoom ratio of the lens is controlled, so that the lens meets the zoom ratio requirement and improves the zoom efficiency.

[0088] In an exemplary embodiment, a distance TTL from the object side surface of the first lens to the imaging surface of the zoom lens on the optical axis in the zoom lens 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 has a constant aperture during zooming, the resolution does not decrease, the image is transparent, and the background blur is natural.

[0090] In an exemplary embodiment, the absolute value of the optical distortion DIS of the optical lens according to the present application at the wide-angle end satisfies |DIS|≤|±5.5%|, and the optical distortion DIS at the telephoto end is ≤8.2%, 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 to reduce the difficulty of lens processing; at the same time, a heat-free design can be achieved through material matching. 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 characteristics of aspherical lenses are: the curvature changes continuously from the center of the lens to the periphery. Unlike spherical lenses with 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 focal power or negative focal power, and also includes an aperture arranged between the second lens group and the third lens group, which can well correct field curvature and distortion, and meet the use requirements of a large target surface (the maximum imaging target surface can reach 12.8mm). Reasonable matching of the focal power of each group allows light to correct high-level aberrations to a large extent when passing smoothly through the lens, 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 realizes 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 the present application has excellent resolution, with a resolution of over 8K.

[0096] The zoom lens of the present application is small in size and achieves maximum 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, so that the zoom lens of the present application is not 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 scope of the zoom lens of the present application.

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

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

[0100] The present application reasonably sets the focal length of each lens group as well as the focal length and surface shape of each lens, which is beneficial for the zoom lens to have a better ability to correct optical aberrations and chromatic aberrations when switching between the wide-angle end and the telephoto end. It is also beneficial for reducing the tolerance sensitivity of the system and improving 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 should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the zoom lens can be changed to obtain the various results and advantages described in this specification. For example, although seventeen lenses are described as an example in the embodiments, the zoom lens is not limited to including seventeen lenses. If necessary, 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 schematic structural diagram of the zoom lens 100 according to Embodiment 1 of the present application when it is at a 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 power, a second lens group G2 with negative power, a third lens group G3 with positive power, a fourth lens group G4 with positive power, a fifth lens group G5 with negative power, and an imaging surface IMA.

[0107] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens L2 has negative power, and its object side surface S2 is concave, and its image side surface S3 is convex. The third lens L3 has positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The first lens L1 and the second lens L2 are cemented to form a double cemented lens.

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

[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 power, and its object-side surface S14 is convex, and its image-side surface S15 is concave. The ninth lens L9 may have positive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex. The tenth lens L10 may have negative power, and its object-side surface S17 is concave, and its image-side surface S18 is concave. The eleventh lens L11 may have positive power, and its object-side surface S18 is convex, and its image-side surface S19 is concave. The twelfth lens L12 may have positive power, and its object-side surface S20 is convex, and its image-side surface S21 is convex. The thirteenth lens L13 may have negative power, and its object-side surface S22 is concave, and its image-side surface S23 is 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. The fourteenth lens L14 may have positive power, and its object-side surface S24 is convex, and its image-side surface S25 is convex. The fifteenth lens L15 may have positive power, and its object-side surface S26 is concave, and its image-side surface S27 is convex. The sixteenth lens L16 has negative power, and its object-side surface S28 is concave, and its image-side surface S29 is concave.

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

[0112] The zoom lens 100 may further include an aperture STO disposed between the second lens group G2 and the third lens group G3, and more specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens 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 protective glass CG having a first side surface S32 and a second side surface S33. Light from an object sequentially passes through each surface S1 to S33 and is finally imaged on an imaging surface IMA, wherein an image sensor chip may be disposed at the imaging surface IMA.

[0113] Table 1 shows basic parameters of the zoom lens 100 of Example 1, wherein the units of the curvature radius and thickness / distance are both 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 end and the telephoto end, respectively. Table 2 also shows the values ​​of the total effective focal length F, the aperture number Fno and the optical distortion DIS of the zoom lens 100 of Example 1 when it is at the wide-angle end and the telephoto end, respectively, wherein F and DIS change as the zoom lens 100 switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and 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 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, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0122]

[0123] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 3 gives the cone coefficient k and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A3 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 distortion diagrams of the zoom lens 100 according to Embodiment 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 in different focal length states.

[0127] Example 2

[0128] The following reference FIG. 2A to FIG. 2D A zoom lens 200 according to Embodiment 2 of the present application will be described. Figure 2A is a schematic structural diagram of the zoom lens 200 according to Embodiment 2 of the present application when it is at a wide-angle end, Figure 2B It 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, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted.

[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 optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an imaging surface IMA.

[0131] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens L2 has negative power, and its object side surface S2 is concave, and its image side surface S3 is convex. The third lens L3 has positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The first lens L1 and the second lens L2 are cemented to form a double cemented lens.

[0132] The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. The fourth lens L4 may have negative power, and its object side surface S6 is concave, and its image side surface S7 is concave. The fifth lens L5 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The sixth lens L6 may have positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The seventh lens L7 may have negative power, and its object side surface S10 is concave, and its image side surface S11 is concave. The fifth lens L5, the sixth lens L6 and the seventh lens L7 are cemented and formed into a double cemented lens.

[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 power, and its object-side surface S13 is convex, and its image-side surface S14 is concave. The ninth lens L9 may have positive power, and its object-side surface S15 is convex, and its image-side surface S16 is convex. The tenth lens L10 may have negative power, and its object-side surface S16 is concave, and its image-side surface S17 is concave. The eleventh lens L11 may have positive power, and its object-side surface S17 is convex, and its image-side surface S18 is concave. The twelfth lens L12 may have positive power, and its object-side surface S19 is convex, and its image-side surface S20 is convex. The thirteenth lens L13 may have negative power, and its object-side surface S21 is concave, and its image-side surface S22 is 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. The fourteenth lens L14 may have positive power, and its object-side surface S23 is convex, and its image-side surface S24 is convex. The fifteenth lens L15 may have positive power, and its object-side surface S25 is concave, and its image-side surface S26 is convex. The sixteenth lens L16 has negative power, and its object-side surface S27 is concave, and its image-side surface S28 is concave.

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

[0136] The zoom lens 200 may further include an aperture STO disposed between the second lens group G2 and the third lens group G3, and more specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens 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 protective glass CG having a first side surface S31 and a second side surface S32. Light from an object sequentially passes through each surface S1 to S32 and is finally imaged on an imaging surface IMA, wherein an image sensor chip may be disposed at the imaging surface IMA.

[0137] Table 4 shows basic parameters of the zoom lens 200 of Example 2, wherein the units of the curvature radius and thickness / distance are both 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, the aperture number Fno and the optical distortion DIS of the zoom lens 200 of Example 2 when it is at the wide-angle end and the telephoto end, respectively, wherein F and DIS change as the zoom lens 200 switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and 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 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 cone 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 the 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 Embodiment 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 in different focal length states.

[0149] Example 3

[0150] The following reference FIG. 3A to FIG. 3D A zoom lens 300 according to Embodiment 3 of the present application will be described. Figure 3A is a schematic structural diagram of a zoom lens 300 according to Embodiment 3 of the present application when it is at a wide-angle end. Figure 3B 3 is a schematic structural diagram of the zoom lens 300 according to Embodiment 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 optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an imaging surface IMA.

[0152] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens L2 has negative power, and its object side surface S2 is concave, and its image side surface S3 is convex. The third lens L3 has positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The first lens L1 and the second lens L2 are cemented to form a double cemented lens.

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

[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 power, and its object-side surface S14 is convex, and its image-side surface S15 is concave. The ninth lens L9 may have positive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex. The tenth lens L10 may have negative power, and its object-side surface S17 is concave, and its image-side surface S18 is concave. The eleventh lens L11 may have positive power, and its object-side surface S18 is convex, and its image-side surface S19 is concave. The twelfth lens L12 may have positive power, and its object-side surface S20 is convex, and its image-side surface S21 is convex. The thirteenth lens L13 may have negative power, and its object-side surface S22 is concave, and its image-side surface S23 is 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. The fourteenth lens L14 may have positive power, and its object-side surface S24 is convex, and its image-side surface S25 is convex. The fifteenth lens L15 may have positive power, and its object-side surface S26 is concave, and its image-side surface S27 is convex. The sixteenth lens L16 has negative power, and its object-side surface S28 is concave, and its image-side surface S29 is concave.

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

[0157] The zoom lens 300 may further include an aperture STO disposed between the second lens group G2 and the third lens group G3, and more specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens 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 protective glass CG having a first side surface S32 and a second side surface S33. Light from an object sequentially passes through each surface S1 to S33 and is finally imaged on an imaging surface IMA, wherein an image sensor chip may be disposed at the imaging surface IMA.

[0158] Table 7 shows basic parameters of the zoom lens 300 of Example 3, where the units of the curvature radius and thickness / distance are both 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, the aperture number Fno and the optical distortion DIS of the zoom lens 300 of Example 3 when it is at the wide-angle end and the telephoto end, respectively, wherein F and DIS change as the zoom lens 300 switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and Fno remains unchanged. The units of T0, T1, T2, T3 and F in Table 8 are all millimeters (mm), and the unit of FOV is degrees (°).

[0163] Table 8

[0164] Wide angle Telephoto end F 13(Fw) 30(Ft) Fno 1.6 1.6 DIS -3.9％ 4.24％ T0 0.2 21.39 T1 27.64 6.45 T2 4.37 0.89 T3 0.4 3.88

[0165] Table 9 shows the cone 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 the formula (1) given in the above embodiment 1.

[0166] Table 9

[0167] Face number k A4 A6 A8 A10 A12 A14 A16 S20 -4.41 -2.69E-05 -5.58E-07 5.39E-09 -1.73E-11 2.00E-13 -1.17E-14 -2.28E-17 S21 -150.00 -8.45E-05 -2.90E-06 4.08E-08 1.28E-10 -5.64E-12 -1.95E-14 5.23E-16 S22 170.00 -1.86E-07 -2.72E-06 2.47E-08 3.20E-12 5.78E-12 -1.72E-13 1.32E-15 S23 -10.50 1.77E-04 -5.54E-07 -5.78E-09 -3.59E-10 1.69E-11 -2.02E-13 9.66E-16 S26 15.20 -2.82E-04 -2.36E-06 2.53E-08 4.20E-10 -1.12E-11 -2.94E-13 5.32E-15 S27 19.10 -2.58E-04 -3.28E-06 1.33E-08 6.85E-10 1.44E-12 -2.48E-13 2.50E-15 S28 45.50 3.09E-04 -3.54E-06 -6.57E-08 -1.65E-11 1.41E-11 3.66E-13 -4.48E-15 S29 14.50 3.04E-04 -9.69E-07 -1.88E-08 -3.14E-09 -4.90E-12 1.75E-12 -1.33E-14 S30 0.77 -7.39E-04 -4.38E-06 -5.53E-08 1.25E-08 -5.06E-10 9.31E-12 -7.60E-14 S31 0.53 -7.63E-04 -1.20E-05 5.56E-07 -1.51E-08 2.70E-10 -3.07E-12 7.33E-15

[0168] Figure 3C and Figure 3D The following are distortion diagrams when the zoom lens 300 according to Embodiment 3 of the present application 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 in different focal length states.

[0169] Example 4

[0170] The following reference FIG. 4A to FIG. 4D A zoom lens 400 according to Embodiment 4 of the present application will be described. Figure 4A is a schematic structural diagram of a zoom lens 400 according to Embodiment 4 of the present application when it is at a wide-angle end, Figure 4B It is a schematic structural diagram of the zoom lens 400 according to Embodiment 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 optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an imaging surface IMA.

[0172] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens L2 has negative power, and its object side surface S2 is concave, and its image side surface S3 is convex. The third lens L3 has positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The first lens L1 and the second lens L2 are cemented to form a double cemented lens.

[0173] The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. The fourth lens L4 may have negative power, and its object-side surface S6 is convex, and its image-side surface S7 is concave. The fifth lens L5 may have negative power, and its object-side surface S8 is concave, and its image-side surface S9 is concave. The sixth lens L6 may have positive power, and its object-side surface S9 is convex, and its image-side surface S10 is convex. The seventh lens L7 may have negative power, and its object-side surface S10 is concave, and its image-side surface S11 is concave. The fifth lens L5, the sixth lens L6 and the seventh lens L7 are cemented and formed into a double cemented lens.

[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 power, and its object-side surface S13 is convex, and its image-side surface S14 is concave. The ninth lens L9 may have positive power, and its object-side surface S15 is convex, and its image-side surface S16 is convex. The tenth lens L10 may have negative power, and its object-side surface S16 is concave, and its image-side surface S17 is concave. The eleventh lens L11 may have positive power, and its object-side surface S17 is convex, and its image-side surface S18 is concave. The twelfth lens L12 may have positive power, and its object-side surface S19 is convex, and its image-side surface S20 is convex. The thirteenth lens L13 may have negative power, and its object-side surface S21 is concave, and its image-side surface S22 is 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. The fourteenth lens L14 may have positive power, and its object-side surface S23 is convex, and its image-side surface S24 is convex. The fifteenth lens L15 may have positive power, and its object-side surface S25 is concave, and its image-side surface S26 is convex. The sixteenth lens L16 has negative power, and its object-side surface S27 is concave, and its image-side surface S28 is concave.

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

[0177] The zoom lens 400 may further include an aperture STO disposed between the second lens group G2 and the third lens group G3, and more specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens 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 protective glass CG having a first side surface S31 and a second side surface S32. Light from an object sequentially passes through each surface S1 to S32 and is finally imaged on an imaging surface IMA, wherein an image sensor chip may be disposed at the imaging surface IMA.

[0178] Table 10 shows basic parameter tables of the zoom lens 400 of Example 4, wherein the units of the curvature radius and thickness / distance are both 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, the aperture number Fno and the optical distortion DIS of the zoom lens 400 of Example 4 when it is at the wide-angle end and the telephoto end, respectively, wherein F and DIS change as the zoom lens 400 switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and 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 cone 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 the 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 distortion diagrams when the zoom lens 400 according to Embodiment 4 of the present application is at the wide-angle end and the telephoto end, respectively. Figure 4C and Figure 4DIt can be seen that the zoom lens 400 provided in Example 4 can achieve good imaging quality in different focal length states.

[0189] Example 5

[0190] The following reference FIG. 5A to FIG. 5D A zoom lens 500 according to Embodiment 5 of the present application will be described. Figure 5A is a schematic structural diagram of a zoom lens 500 according to Embodiment 5 of the present application when it is at a wide-angle end, Figure 5B It is a schematic structural diagram of the zoom lens 500 according to Embodiment 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 optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with positive optical power, and an imaging surface IMA.

[0192] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens L2 has negative power, and its object side surface S2 is concave, and its image side surface S3 is convex. The third lens L3 has positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The first lens L1 and the second lens L2 are cemented to form a double cemented lens.

[0193] The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. The fourth lens L4 may have negative power, and its object-side surface S6 is convex, and its image-side surface S7 is concave. The fifth lens L5 may have negative power, and its object-side surface S8 is concave, and its image-side surface S9 is concave. The sixth lens L6 may have positive power, and its object-side surface S9 is convex, and its image-side surface S10 is convex. The seventh lens L7 may have negative power, and its object-side surface S10 is concave, and its image-side surface S11 is concave. The fifth lens L5, the sixth lens L6 and the seventh lens L7 are cemented and formed into a double cemented lens.

[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 power, and its object-side surface S13 is convex, and its image-side surface S14 is concave. The ninth lens L9 may have positive power, and its object-side surface S15 is convex, and its image-side surface S16 is convex. The tenth lens L10 may have negative power, and its object-side surface S16 is concave, and its image-side surface S17 is concave. The eleventh lens L11 may have positive power, and its object-side surface S17 is convex, and its image-side surface S18 is concave. The twelfth lens L12 may have positive power, and its object-side surface S19 is convex, and its image-side surface S20 is convex. The thirteenth lens L13 may have negative power, and its object-side surface S21 is concave, and its image-side surface S22 is 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. The fourteenth lens L14 may have positive power, and its object-side surface S23 is convex, and its image-side surface S24 is convex. The fifteenth lens L15 may have positive power, and its object-side surface S25 is concave, and its image-side surface S26 is convex. The sixteenth lens L16 has negative power, and its object-side surface S27 is concave, and its image-side surface S28 is concave.

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

[0197] The zoom lens 500 may further include an aperture STO disposed between the second lens group G2 and the third lens group G3, and more specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens 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 protective glass CG having a first side surface S31 and a second side surface S32. Light from an object sequentially passes through each surface S1 to S32 and is finally imaged on an imaging surface IMA, wherein an image sensor chip may be disposed at the imaging surface IMA.

[0198] Table 13 shows basic parameter tables of the zoom lens 500 of Example 5, wherein the units of the curvature radius and thickness / distance are both 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, the aperture number Fno and the optical distortion DIS of the zoom lens 500 of Example 5 when it is at the wide-angle end and the telephoto end, respectively, wherein F and DIS change as the zoom lens 500 switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and 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 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 cone 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 the formula (1) given in the above embodiment 1.

[0206] Table 15

[0207]

[0208]

[0209] Figure 5C and Figure 5D The following are distortion diagrams of the zoom lens 500 according to Embodiment 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 / Example 1 2 3 4 5 3.7≤FG1 / Fw≤6.2 4.73 4.02 6.09 6.12 6.00 -1.8≤FG2 / Fw≤-1.4 -1.48 -1.54 -1.67 -1.71 -1.76 1.56≤FG3 / Fw≤2.3 1.83 1.66 2.07 2.13 2.24 2.23≤FG4 / Fw≤3 2.48 2.89 2.63 2.64 2.76 7.9≤|FG5 / Fw|≤32.5 7.95 19.11 13.68 32.03 10.02 1.6≤D2 / IH≤1.7 1.66 1.65 1.66 1.69 1.70 4.16≤TTL / D2≤4.37 4.23 4.27 4.34 4.34 4.32 1.1≤D2 / Fw≤1.8 1.42 1.24 1.63 1.67 1.68 0.18≤TG4 / FG4≤0.31 0.24 0.20 0.30 0.29 0.28 0.34≤Ft / FG1≤0.6 0.51 0.56 0.38 0.38 0.39 1.46≤f8 / FG3≤2.5 1.69 1.61 2.22 2.23 2.39 6.98≤TTL / IH≤7.4 7.03 7.03 7.19 7.34 7.34 36.4≤TTL / (Ft / Fw)≤41.4 36.99 40.28 39.87 40.73 40.62 2.58≤(f12-f13) / FG3≤3.24 2.84 2.65 2.93 2.80 2.70 1.41≤f1 / FG1≤1.6 1.44 1.48 1.49 1.53 1.58 2.0≤Ft / Fw≤2.5 2.43 2.23 2.31 2.31 2.31

[0213] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

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; 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; 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 between the object side and the image side along the optical axis to compensate for changes in image plane position during zooming.

2. The zoom lens according to claim 1, wherein: The first lens has positive optical power; The second lens has negative optical power; The third lens has positive refractive power.

3. The zoom lens according to claim 2, wherein: 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.

4. The zoom lens according to claim 1, wherein: The fourth lens has negative optical power; The fifth lens has negative optical power; The sixth lens has positive optical power; The seventh lens has negative refractive power.

5. The zoom lens according to claim 4, wherein: The image side surface of the fourth lens is a concave surface; The object side surface of the fifth lens is concave, and the image side surface is concave; The object side surface of the sixth lens is convex, and the image side surface is convex; The object-side surface of the seventh lens is concave, and the image-side surface is concave.

6. The zoom lens according to claim 1, wherein: The eighth lens has positive refractive power; The ninth lens has positive optical power; The tenth lens has negative optical power; The eleventh lens has positive refractive power; The twelfth lens has positive optical power; The thirteenth lens has negative refractive power.

7. The zoom lens according to claim 6, wherein: 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 a convex surface, and the image side surface is a convex surface; The object side surface of the tenth lens is a concave surface, and the image side surface is a concave surface; 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; the image side surface of the thirteenth lens is concave, and the image side surface is concave.

8. The zoom lens according to claim 1, wherein: The fourteenth lens has positive refractive power; The fifteenth lens has positive refractive power; The sixteenth lens has negative refractive power.

9. The zoom lens according to claim 8, wherein: 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.

10. The zoom lens according to any one of claims 1 to 9, characterized in that: 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, 2.4≤FG4 / Fw≤2.9, 7.9≤|FG5 / Fw|≤32.1, 1.65≤D2 / IH≤1.7, 4.2≤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≤2.95, 2.2≤Ft / Fw≤2.5, Among them, 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 when the zoom lens is at the wide-angle end, D2 is the axial 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 axial 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 when the zoom lens is 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