Zoom lens

Abstract

The utility model discloses a zoom lens, which sequentially comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and a sixth lens group from an object side to an image side along an optical axis, the second lens group has negative focal power, and the second lens group is a zoom group; the third lens group has positive focal power, and the third lens group is a fixed group; the fourth lens group has positive focal power, and the fourth lens group is a compensation group; the fifth lens group has focal power, and the fifth lens group is a fixed group; wherein the first lens group sequentially comprises a first lens, a second lens and a third lens from the object side to the image side along the optical axis; the second lens group sequentially comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens; the third lens group sequentially comprises an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens; the fourth lens group sequentially comprises a fourteenth lens and a fifteenth lens; the fifth lens group sequentially comprises a sixteenth lens and a seventeenth lens.

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 focus of the existing zoom lenses drifts in high and low temperature environments, and the imaging effect is easily affected by the environment; 2) The existing zoom lenses have large distortion, which causes the photographed people or scenes to be deformed and cannot truly restore the scene; 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 aperture of the existing zoom lenses is small and the aperture changes during zooming, so the imaging picture is not transparent; 5) The image height of the existing zoom lenses is small.

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

[0006] The present application provides a zoom lens, which comprises, in order from the object side to the image side along the optical axis: a first lens group with positive optical power, which is a fixed group; a second lens group with negative optical power, which is a zoom group; a third lens group with positive optical power, which is a fixed group; a fourth lens group with positive optical power, which is a compensation group; and a fifth lens group with positive optical power or negative optical power, which is a fixed group; wherein the first lens group comprises, 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 comprises, 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, wherein the fifth lens has positive power and the sixth lens has negative power; 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 and a fifteenth lens; the fifth lens group includes, in order from the object side to the image side along the optical axis: a sixteenth lens and a seventeenth lens; the second lens group moves between the object side and the image side along the optical axis to achieve continuous zooming between the wide-angle end and the telephoto end; the fourth lens group moves between the object side and the image side along the optical axis to achieve compensation for changes in the image plane position during zooming.

[0007] In one embodiment, the first lens has negative optical power; the second lens has positive 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 concave; the object side surface of the second lens is convex, 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; and the seventh lens has positive optical power.

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

[0011] In one embodiment, the eighth lens has positive optical power; the ninth lens has negative optical power; the tenth lens has positive optical power; the eleventh lens has negative 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 concave; the object side surface of the tenth lens is convex, and the image side surface is convex; the object side surface of the eleventh lens is concave, and the image side surface is concave; the object side surface of the twelfth lens is convex; and the image side surface of the thirteenth lens is concave.

[0013] In one embodiment, the fourteenth lens has positive refractive power; and the fifteenth lens has negative refractive power.

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

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

[0016] In one embodiment, the object-side surface of the sixteenth lens is concave, and the image-side surface is convex; 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: 3.5≤FG1 / Fw≤5.5, 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: -2.0≤FG2 / Fw≤-1.0, 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: 1.0≤FG3 / Fw≤2.5, 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: 2.0≤FG4 / Fw≤4.0, 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: -50≤FG5 / Fw≤60, 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: 1.5≤D2 / IH≤2.5, 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: 0.1≤D2 / TTL≤0.4, wherein D2 is an axial distance between a position of the second lens group on the optical axis when the zoom lens is at a wide-angle end and a position of the second lens group on the optical axis when the zoom lens is at a telephoto end, and TTL is an axial distance from the object side surface of the first lens to an imaging surface of the zoom lens.

[0024] In one embodiment, the zoom lens satisfies: 1.1≤D2 / Fw≤2.3, 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: 50.0≤Vd G3 ≤75.0.

[0026] In one embodiment, the refractive index Nd of at least one lens in the third lens group is G3 Satisfy: 1.85≤Nd G3 ≤2.1.

[0027] In one embodiment, the zoom lens satisfies: 0≤TG4 / FG4≤0.3, 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.

[0028] In one embodiment, the zoom lens satisfies: 0.5≤Ft / FG1≤0.9, 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.

[0029] In one embodiment, the zoom lens satisfies: 0.8≤f8 / FG3≤1.8, wherein f8 is the effective focal length of the eighth lens, and FG3 is the effective focal length of the third lens group.

[0030] In one embodiment, the zoom lens satisfies: 5.0≤TTL / IH≤8.0, 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.

[0031] In one embodiment, the zoom lens satisfies: 27.0≤TTL / (Ft / Fw)≤35.0, 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 axial distance from the object side surface of the first lens to the imaging surface of the zoom lens.

[0032] In one embodiment, the zoom lens satisfies: dn / dt<-4E-6, where dn / dt is the relative refractive index temperature coefficient of the twelfth lens.

[0033] 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, constant aperture, small size, large target surface, low distortion, high resolution, infrared confocality, and no defocus at high and low temperatures of -40°C to 80°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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:

[0035] Figure 1A and Figure 1B They 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;

[0036] 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;

[0037] 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;

[0038] 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;

[0039] 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;

[0040] 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;

[0041] 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; and

[0042] Figure 4C and Figure 4D They 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 respectively. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The features, principles and other aspects of the present application are described in detail below.

[0051] 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, and the second lens group 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.

[0052] The first lens group of the zoom lens according to the exemplary embodiment of the present application has a positive focal length, which is conducive to correcting the field curvature of the system at different object distances, and can reduce the tolerance sensitivity and ensure the uniformity of the picture. The third lens group has a positive focal length, which makes the outgoing light trend smooth and reduces the generation of aberrations. The fifth lens group has a positive focal length or a negative focal length, which is conducive to reducing the change of field curvature during the entire zoom process and improving the optical imaging quality.

[0053] 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 negative optical power, and its object side surface is convex, and its image side surface is concave; the second lens may have positive optical power, and its object side surface is convex, and its image side surface is concave; the third lens may have positive optical power, and its object side surface is convex, and its image side surface is concave. Two meniscus lenses are arranged in the first lens group, which is beneficial to the correction of field curvature at different object distances; the object side surface of the first lens of the first lens group is set to be convex, and the image side surface is set to be concave, which is beneficial to reduce distortion.

[0054] In an exemplary embodiment, the first lens and the second lens may be cemented into a doublet lens.

[0055] 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 include at least two lenses with negative optical power, which is beneficial to increase the light divergence speed and improve the zoom efficiency. Exemplarily, the fourth lens has negative optical power, and its object side surface is concave and the image side surface is concave; the fifth lens has positive optical power, and its object side surface is concave and the image side surface is convex; the sixth lens has negative optical power, and its object side surface is concave and the image side surface is concave; the seventh lens has positive optical power and its object side surface is convex. In addition, the second lens group may include a cemented lens, which is beneficial to balance the chromatic aberration at the position of the second lens group and improve the overall resolution. Exemplarily, the fifth lens, the sixth lens and the seventh lens can be cemented into a triplet lens.

[0056] 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. The third lens group may include a convex-concave lens with positive optical power and at least one convex-convex lens with positive optical power. Exemplarily, the eighth lens has positive optical power, and its object side surface is convex, and its image side surface is concave; the ninth lens has negative optical power, and its object side surface is convex, and its image side surface is concave; the tenth lens has positive optical power, and its object side surface is convex, and its image side surface is convex; the eleventh lens has negative optical power, and its object side surface is concave, and its image side surface is concave; the twelfth lens has positive optical power, and its object side surface is convex; the thirteenth lens has negative optical power, 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; the tenth lens is set as a biconvex lens with positive optical power, which is conducive to reducing the height of the light and reducing the generation of aberrations.

[0057] In an exemplary embodiment, the third lens group may include a cemented lens, which may be a combination of a lens with positive power and a lens with negative power, which is beneficial to the mutual compensation of positive and negative spherical aberrations and to improve the resolution of the system. Exemplarily, the ninth lens, the tenth lens and the eleventh lens may be cemented into a triplet lens.

[0058] In an exemplary embodiment, the fourth lens group may include: a fourteenth lens and a fifteenth lens in order from the object side to the image side along the optical axis. The fourth lens group may include a lens with positive optical power and a lens with negative optical power. The provision of a lens with positive optical power is conducive to balancing the astigmatism and distortion introduced by the previous group, and the provision of a lens with negative optical power is conducive to balancing the spherical aberration of the optical system. Exemplarily, the fourteenth lens has positive optical power, and its object side surface is convex and its image side surface is convex; the fifteenth lens has negative optical power, and its image side surface is concave.

[0059] In an exemplary embodiment, the fifth lens group includes, in order from the object side to the image side along the optical axis: a sixteenth lens and a seventeenth lens. The fifth lens group may include two plastic lenses, which are beneficial to athermal design and to balancing various aberrations of the optical system.

[0060] In an exemplary embodiment, the sixteenth lens has positive refractive power, its object-side surface is concave, and its image-side surface is convex; the seventeenth lens has positive refractive power or negative refractive power, its object-side surface is convex, and its image-side surface is concave.

[0061] In an exemplary embodiment, the zoom lens according to the present application further includes an aperture disposed between the second lens group and the third lens group. The aperture is conducive to converging the light entering the optical system, reducing the aperture of the optical system, and reducing the assembly sensitivity of the system. Exemplarily, the aperture may be disposed between the seventh lens and the eighth lens. However, it should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be disposed at other positions according to actual needs.

[0062] In an exemplary embodiment, the position of the second lens group along the optical axis is adjustable, that is, the second lens group can be moved from the image side to the object side or from the object side to the image side along the optical axis, so that the zoom lens performs continuous zooming. Specifically, 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 performs continuous zooming.

[0063] In an exemplary embodiment, the position of the fourth lens group along the optical axis is adjustable. For example, the fourth lens group can move along the optical axis corresponding to the movement of the second lens group to achieve a compensation effect, so that the zoom lens has a better imaging position and stable imaging quality during continuous zooming.

[0064] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 3.5≤FG1 / Fw≤5.5, 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. Satisfying 3.5≤FG1 / Fw≤5.5 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.

[0065] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: -2.0≤FG2 / Fw≤-1.0, 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. Satisfying -2.0≤FG2 / Fw≤-1.0, by reasonably controlling the focal length value of the second lens group, the imaging performance is achieved while ensuring the required zoom ratio during the zooming process, so that the zoom ratio satisfies 3X.

[0066] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 1.0≤FG3 / Fw≤2.5, 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. Satisfying 1.0≤FG3 / Fw≤2.5 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 optical transition smooth, effectively reducing the generation of aberrations, and improving the optical imaging quality.

[0067] In the exemplary embodiment of the present application, the zoom lens according to the present application can satisfy: 2.0≤FG4 / Fw≤4.0, 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. Satisfying 2.0≤FG4 / Fw≤4.0, by reasonably controlling the focal length value of the fourth lens group, the stability of the image plane during the zooming process is ensured, 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 optical distortion DIS of the optical lens at the wide-angle end is ≤|±2%|, and the optical distortion DIS at the telephoto end is ≤10.5%, achieving a low distortion effect.

[0068] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: -50≤FG5 / Fw≤60, 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. When -50≤FG5 / Fw≤60 is satisfied, 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.

[0069] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 1.5≤D2 / IH≤2.5, 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. When 1.5≤D2 / IH≤2.5 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 miniaturization of the optical lens, so that the total optical length TTL of the zoom lens is less than 100 mm.

[0070] In an exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 0.1≤D2 / TTL≤0.4, 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. Satisfying 0.1≤D2 / TTL≤0.4 and controlling the ratio of the moving distance of the second lens group to the total optical length of the lens within a specific range is conducive to achieving a small volume while ensuring tolerance sensitivity and improving the zoom response speed of the lens.

[0071] In the exemplary embodiment of the present application, the zoom lens according to the present application may satisfy: 1.1≤D2 / Fw≤2.3, wherein 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, and Fw is the total effective focal length of the zoom lens at the wide-angle end. Satisfying 1.1≤D2 / Fw≤2.3 is conducive to reducing the aberration 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.

[0072] 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: 50.0≤Vd G3 ≤75.0, and 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, which is beneficial to effectively correct the chromatic aberration of the third lens group, thereby improving the imaging quality of the optical system.

[0073] In the exemplary embodiment of the present application, the refractive index Nd of at least one lens in the third lens group is G3 Satisfy: 1.85≤Nd G3 ≤2.1, and reasonably controlling the refractive index of the third lens group so that the refractive index of at least one lens in the third lens group satisfies the range of the conditional formula, which is beneficial to effectively correct the chromatic aberration of the third lens group, thereby improving the imaging quality of the optical system.

[0074] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 0≤TG4 / FG4≤0.3, 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. Satisfying 0≤TG4 / FG4≤0.3, 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 100 mm.

[0075] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 0.5≤Ft / FG1≤0.9, 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 0.5≤Ft / FG1≤0.9 is conducive to balancing various aberrations at the telephoto end and improving resolution.

[0076] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 0.8≤f8 / FG3≤1.8, where f8 is the effective focal length of the eighth lens and FG3 is the effective focal length of the third lens group. Satisfying 0.8≤f8 / FG3≤1.8, 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.

[0077] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 5.0≤TTL / IH≤8.0, 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. Satisfying 5.0≤TTL / IH≤8.0 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.

[0078] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: 27.0≤TTL / (Ft / Fw)≤35.0, 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. Satisfying 27.0≤TTL / (Ft / Fw)≤35.0 and reasonably controlling the ratio of the lens zoom ratio Ft / Fw to the lens optical total length TTL 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.

[0079] In the exemplary embodiment of the present application, the zoom lens according to the present application satisfies: dn / dt<-4E-6, where dn / dt is the relative refractive index temperature coefficient of the twelfth lens. The material with the relative refractive index temperature coefficient is reasonably selected so that the zoom lens does not have a false focus in the temperature range of -40°C to 80°C.

[0080] 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<100 mm.

[0081] 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.

[0082] In an exemplary embodiment, the optical distortion DIS of the optical lens according to the present application at the wide-angle end is ≤|±2%|, and the optical distortion DIS at the telephoto end is ≤10.5%, and has the characteristic of low distortion.

[0083] In an exemplary embodiment, the zoom lens according to the present application has a maximum field of view FOV≥43° at the wide-angle end and a maximum field of view FOV≥14° at the telephoto end.

[0084] 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: 14.9 mm≤Fw≤16.0 mm, and the total effective focal length Ft of the zoom lens at the telephoto end satisfies: 44.7 mm≤Ft≤48.0 mm.

[0085] 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.

[0086] The zoom lens of the present application may adopt a glass-plastic hybrid lens structure, thereby reducing the design cost while ensuring the required zoom ratio of the lens.

[0087] The zoom lens according to the present application adopts a five-group architecture of fixed + zoom + fixed + compensation + fixed. More specifically, the five-group architecture includes a first lens group with positive optical focal power, a second lens group with negative optical focal power, a third lens group with positive optical focal power, a fourth lens group with positive optical focal power, and a fifth lens group with positive optical focal power or negative optical focal power, and also includes an aperture stop 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).

[0088] The zoom lens of the present application has excellent resolution, with a resolution of over 8K.

[0089] The zoom lens of the present application is small in size and achieves maximum performance in the smallest possible size.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] Specific embodiments of the zoom lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0095] Example 1

[0096] 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.

[0097] 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 positive power, and an imaging surface IMA.

[0098] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive power, and its object side surface S2 is convex, 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.

[0099] 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 positive power, and its object-side surface S8 is concave, and its image-side surface S9 is convex. The sixth lens L6 may have negative power, and its object-side surface S9 is concave, and its image-side surface S10 is concave. The seventh lens L7 may have positive power, and its object-side surface S10 is convex, 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 triplet lens.

[0100] 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 negative power, and its object-side surface S15 is convex, and its image-side surface S16 is concave. The tenth lens L10 may have positive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex. The eleventh lens L11 may have negative power, and its object-side surface S17 is concave, 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 concave. The thirteenth lens L13 may have negative power, and its object-side surface S21 is convex, 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.

[0101] The fourth lens group G4 includes a fourteenth lens L14 and a fifteenth lens L15. The fourteenth lens L14 may have positive refractive power, and its object-side surface S23 is convex, and its image-side surface S24 is convex. The fifteenth lens L15 may have negative refractive power, and its object-side surface S25 is convex, and its image-side surface S26 is concave.

[0102] The fifth lens group G5 includes a sixteenth lens L16 and a seventeenth lens L17. The sixteenth lens L16 has positive refractive power, its object-side surface S27 is concave, and its image-side surface S28 is convex. The seventeenth lens L17 has positive refractive power, its object-side surface S29 is convex, and its image-side surface S30 is concave.

[0103] The zoom lens 100 may further include a stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens 100 may further include a filter CG having a first side surface S31 and a second side surface S32 and / or a protective glass (not shown) having a first side surface and a second side surface. 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.

[0104] 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).

[0105]

[0106] Table 1

[0107] 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.

[0108] Table 2 shows the values ​​of T1, T2, T3 and T4 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, the absolute value of optical distortion DIS and the maximum field of view FOV of the zoom lens 100 of Example 1 when it is at the wide-angle end and the telephoto end, respectively, wherein F, DIS and FOV 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 T1, T2, T3, T4 and F in Table 2 are all millimeters (mm), and the unit of FOV is degrees (°).

[0109] Wide-angle end Telephoto end F 16(Fw) 48(Ft) Fno 1.6 1.6 DIS 0.73％ 8.35％ FOV 43.3 14 T1 5.222 27.172 T2 22.576 0.626 T3 5.304 5.099 T4 3.890 4.095

[0110] Table 2

[0111] 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 x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0112]

[0113] 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 .

[0114] Face number k A4 A6 A8 A10 A12 S19 -2.691 -9.88E-05 -2.02E-06 -6.96E-09 2.22E-10 -1.83E-12 S20 -50.000 -3.85E-05 -2.89E-06 -5.29E-09 3.75E-10 -2.62E-12 S21 50.000 2.78E-04 -1.39E-06 -1.79E-08 1.73E-11 1.88E-12 S22 6.066 1.58E-04 -8.73E-07 -1.35E-08 -5.37E-10 5.83E-12 S25 -8.484 -1.50E-04 2.05E-06 -2.18E-08 7.50E-11 -5.14E-13 S26 -2.350 2.44E-05 2.97E-06 -5.43E-08 1.24E-09 -1.39E-11 S27 -5.977 9.99E-04 -9.72E-06 -1.30E-07 2.97E-09 -3.25E-11 S28 -7.707 1.16E-03 4.41E-06 -3.89E-07 5.05E-09 -4.29E-11 S29 -5.947 -2.24E-04 7.38E-06 -9.31E-08 -1.20E-09 -3.33E-12 S30 -16.240 -1.12E-04 -1.17E-05 5.22E-07 -1.32E-08 1.06E-10

[0115] Table 3

[0116] 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.

[0117] Example 2

[0118] 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.

[0119] In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted.

[0120] like Figure 2A and Figure 2BAs 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.

[0121] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive power, and its object side surface S2 is convex, 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.

[0122] 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 positive power, and its object-side surface S8 is concave, and its image-side surface S9 is convex. The sixth lens L6 may have negative power, and its object-side surface S9 is concave, and its image-side surface S10 is concave. The seventh lens L7 may have positive power, and its object-side surface S10 is convex, and its image-side surface S11 is flat. The fifth lens L5, the sixth lens L6 and the seventh lens L7 are cemented and formed into a triplet lens.

[0123] 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 negative power, and its object-side surface S15 is convex, and its image-side surface S16 is concave. The tenth lens L10 may have positive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex. The eleventh lens L11 may have negative power, and its object-side surface S17 is concave, 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.

[0124] The fourth lens group G4 includes a fourteenth lens L14 and a fifteenth lens L15. The fourteenth lens L14 may have positive refractive power, and its object-side surface S23 is convex, and its image-side surface S24 is convex. The fifteenth lens L15 may have negative refractive power, and its object-side surface S25 is concave, and its image-side surface S26 is concave.

[0125] The fifth lens group G5 includes a sixteenth lens L16 and a seventeenth lens L17. The sixteenth lens L16 has positive refractive power, its object-side surface S27 is concave, and its image-side surface S28 is convex. The seventeenth lens L17 has negative refractive power, its object-side surface S29 is convex, and its image-side surface S30 is concave.

[0126] The zoom lens 200 may further include a stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens 200 may further include a filter CG having a first side surface S31 and a second side surface S32 and / or a protective glass (not shown) having a first side surface and a second side surface. 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.

[0127] 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).

[0128]

[0129] Table 4

[0130] Table 5 shows the values ​​of T1, T2, T3 and T4 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, the absolute value of optical distortion DIS and the maximum field of view FOV of the zoom lens 200 of Example 2 when it is at the wide-angle end and the telephoto end, respectively, wherein F, DIS and FOV 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 T1, T2, T3, T4 and F in Table 5 are all millimeters (mm), and the unit of FOV is degrees (°).

[0131] Wide-angle end Telephoto end F 15.03(Fw) 45.09(Ft) Fno 1.6 1.6 DIS 0.63％ 8.99％ FOV 46.3 14.8 T1 4.791 29.052 T2 24.861 0.600 T3 3.562 3.542 T4 2.394 2.414

[0132] Table 5

[0133] Table 6 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A 10 and A 12 , wherein each aspheric surface shape can be defined by the formula (1) given in the above embodiment 1.

[0134] Face number k A4 A6 A8 A10 A12 S19 -0.394 -6.96E-05 -1.18E-06 2.76E-09 3.65E-10 -2.42E-12 S20 -17.840 1.30E-05 -1.77E-06 -6.84E-10 3.22E-10 -1.85E-12 S21 -23.250 2.92E-04 -1.54E-06 -2.15E-08 -8.94E-11 3.21E-12 S22 9.501 1.84E-04 -9.99E-07 -2.02E-08 -4.13E-10 6.41E-12 S25 -11.582 -1.30E-04 2.18E-06 -3.01E-08 3.19E-11 1.99E-12 S26 -17.956 1.13E-04 1.74E-06 -2.23E-08 2.79E-10 -7.13E-14 S27 -7.014 1.23E-03 -7.34E-06 -1.12E-07 3.05E-09 -4.17E-11 S28 -6.807 1.22E-03 3.41E-06 -2.88E-07 6.43E-09 -1.37E-10 S29 -1.226 -9.00E-04 9.55E-06 -1.46E-07 1.77E-09 -9.26E-11 S30 -11.327 -7.17E-05 -2.11E-05 8.10E-07 -1.92E-08 1.71E-10

[0135] Table 6

[0136] Figure 2C and Figure 2DThe 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.

[0137] Example 3

[0138] 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.

[0139] like Figure 3A and Figure 3B As 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.

[0140] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive power, and its object side surface S2 is convex, 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.

[0141] 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 positive power, and its object-side surface S8 is concave, and its image-side surface S9 is convex. The sixth lens L6 may have negative power, and its object-side surface S9 is concave, and its image-side surface S10 is concave. The seventh lens L7 may have positive power, and its object-side surface S10 is convex, 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 triplet lens.

[0142] 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 negative power, and its object-side surface S15 is convex, and its image-side surface S16 is concave. The tenth lens L10 may have positive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex. The eleventh lens L11 may have negative power, and its object-side surface S17 is concave, 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 convex, 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.

[0143] The fourth lens group G4 includes a fourteenth lens L14 and a fifteenth lens L15. The fourteenth lens L14 may have positive refractive power, and its object-side surface S23 is convex, and its image-side surface S24 is convex. The fifteenth lens L15 may have negative refractive power, and its object-side surface S25 is concave, and its image-side surface S26 is concave.

[0144] The fifth lens group G5 includes a sixteenth lens L16 and a seventeenth lens L17. The sixteenth lens L16 has positive refractive power, its object-side surface S27 is concave, and its image-side surface S28 is convex. The seventeenth lens L17 has negative refractive power, its object-side surface S29 is convex, and its image-side surface S30 is concave.

[0145] The zoom lens 300 may further include a stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens 300 may further include a filter CG having a first side surface S31 and a second side surface S32 and / or a protective glass (not shown) having a first side surface and a second side surface. 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.

[0146] 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).

[0147]

[0148]

[0149] Table 7

[0150] Table 8 shows the values ​​of T1, T2, T3 and T4 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, the absolute value of optical distortion DIS and the maximum field of view FOV of the zoom lens 300 of Example 3 when it is at the wide-angle end and the telephoto end, respectively, wherein F, DIS and FOV 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. In Table 8, the units of T1, T2, T3, T4 and F are all millimeters (mm), and the unit of FOV is degrees (°).

[0151] Wide angle Telephoto end F 14.9(Fw) 44.7(Ft) Fno 1.6 1.6 DIS 1.74％ 10.38％ FOV 45.8 14.8 T1 5.624 27.734 T2 22.776 0.666 T3 3.825 3.817 T4 3.795 3.804

[0152] Table 8

[0153] Table 9 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A 10 and A 12 , wherein each aspheric surface shape can be defined by the formula (1) given in the above embodiment 1.

[0154] Face number k A4 A6 A8 A10 A12 S19 -0.786 -7.11E-05 -1.55E-06 -8.38E-09 2.43E-10 -4.08E-12 S20 -50.000 7.24E-06 -2.54E-06 -7.96E-09 2.51E-10 -2.63E-12 S21 50.000 2.87E-04 -1.40E-06 -1.99E-08 1.41E-11 2.58E-12 S22 7.651 1.74E-04 -9.72E-07 -1.48E-08 -4.88E-10 5.88E-12 S25 -47.081 -1.02E-04 2.01E-06 -3.29E-08 1.10E-10 9.30E-13 S26 -0.898 4.61E-05 3.05E-06 -3.76E-08 2.56E-10 1.61E-12 S27 -7.287 1.27E-03 -7.59E-06 -1.53E-07 2.67E-09 -3.30E-11 S28 -7.043 1.28E-03 5.28E-06 -3.46E-07 4.87E-09 -1.12E-10 S29 -4.299 -7.51E-04 9.33E-06 -1.68E-07 6.50E-10 -7.65E-11 S30 -13.483 -2.50E-04 -1.75E-05 7.06E-07 -1.77E-08 1.65E-10

[0155] Table 9

[0156] 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.

[0157] Example 4

[0158] 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.

[0159] 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.

[0160] The first lens group G1 includes a first lens L1, a second lens L2 and a third lens L3. The first lens L1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive power, and its object side surface S2 is convex, 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.

[0161] 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 positive power, and its object-side surface S8 is concave, and its image-side surface S9 is convex. The sixth lens L6 may have negative power, and its object-side surface S9 is concave, and its image-side surface S10 is concave. The seventh lens L7 may have positive power, and its object-side surface S10 is convex, and its image-side surface S11 is convex. The fifth lens L5, the sixth lens L6 and the seventh lens L7 are cemented to form a triplet lens.

[0162] 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 negative power, and its object-side surface S15 is convex, and its image-side surface S16 is concave. The tenth lens L10 may have positive power, and its object-side surface S16 is convex, and its image-side surface S17 is convex. The eleventh lens L11 may have negative power, and its object-side surface S17 is concave, 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 convex, 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.

[0163] The fourth lens group G4 includes a fourteenth lens L14 and a fifteenth lens L15. The fourteenth lens L14 may have positive refractive power, and its object-side surface S23 is convex, and its image-side surface S24 is convex. The fifteenth lens L15 may have negative refractive power, and its object-side surface S25 is concave, and its image-side surface S26 is concave.

[0164] The fifth lens group G5 includes a sixteenth lens L16 and a seventeenth lens L17. The sixteenth lens L16 has positive refractive power, its object-side surface S27 is concave, and its image-side surface S28 is convex. The seventeenth lens L17 has negative refractive power, its object-side surface S29 is convex, and its image-side surface S30 is concave.

[0165] The zoom lens 400 may further include a stop STO disposed between the second lens group G2 and the third lens group G3. More specifically, the stop STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens 400 may further include a filter CG having a first side surface S31 and a second side surface S32 and / or a protective glass (not shown) having a first side surface and a second side surface. 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.

[0166] 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).

[0167]

[0168]

[0169] Table 10

[0170] Table 11 shows the values ​​of T1, T2, T3 and T4 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, the absolute value of optical distortion DIS and the maximum field of view FOV of the zoom lens 400 of Example 4 when it is at the wide-angle end and the telephoto end, respectively, wherein F, DIS and FOV 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 T1, T2, T3, T4 and F in Table 11 are all millimeters (mm), and the unit of FOV is degrees (°).

[0171] Wide-angle end Telephoto end F 15.03(Fw) 45.1(Ft) Fno 1.6 1.6 DIS 0.72％ 8.58％ FOV 46.4 14.9 T1 7.102 34.578 T2 28.076 0.600 T3 3.316 3.497 T4 3.598 3.417

[0172] Table 11

[0173] Table 12 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A 10 and A 12 , wherein each aspheric surface shape can be defined by the formula (1) given in the above embodiment 1.

[0174] Face number k A4 A6 A8 A10 A12 S19 -0.854 -7.22E-05 -1.23E-06 -3.85E-09 2.38E-10 -4.31E-12 S20 -50.000 1.54E-05 -2.07E-06 -7.82E-09 2.12E-10 -2.35E-12 S21 47.829 2.95E-04 -1.52E-06 -2.11E-08 -5.42E-11 4.32E-12 S22 6.207 1.78E-04 -1.06E-06 -2.13E-08 -4.08E-10 7.37E-12 S25 -14.515 -1.12E-04 1.93E-06 -3.75E-08 2.11E-10 1.36E-12 S26 0.225 5.25E-05 2.34E-06 -1.60E-08 -3.14E-10 7.82E-12 S27 -7.160 1.31E-03 -8.09E-06 -1.46E-07 2.73E-09 -3.68E-11 S28 -7.119 1.32E-03 5.27E-06 -3.47E-07 5.14E-09 -1.35E-10 S29 -3.316 -6.99E-04 9.86E-06 -1.51E-07 1.14E-09 -9.80E-11 S30 -17.804 -1.91E-04 -1.53E-05 7.05E-07 -1.90E-08 1.80E-10

[0175] Table 12

[0176] 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.

[0177] In summary, Examples 1 to 4 respectively satisfy the relationships shown in Table 13.

[0178] Conditional / Example 1 2 3 4 3.5≤FG1 / Fw≤5.5 3.907 4.403 4.181 4.957 -2.0≤FG2 / Fw≤-1.0 -1.186 -1.397 -1.285 -1.588 1.0≤FG3 / Fw≤2.5 1.460 1.792 1.677 1.907 2.0≤FG4 / Fw≤4.0 3.509 2.372 2.975 2.689 -50≤FG5 / Fw≤60 54.874 -11.002 -34.024 -14.563 1.5≤D2 / IH≤2.5 1.715 1.895 1.727 2.147 0.1≤D2 / TTL≤0.4 0.247 0.267 0.251 0.289 1.1≤D2 / Fw≤2.3 1.372 1.614 1.484 1.828 0≤TG4 / FG4≤0.3 0.080 0.251 0.156 0.198 0.5≤Ft / FG1≤0.9 0.768 0.681 0.718 0.605 0.8≤f8 / FG3≤1.8 1.363 0.989 1.507 1.385 5.0≤TTL / IH≤8.0 6.953 7.109 6.875 7.422 27.0≤TTL / (Ft / Fw)≤35.0 29.667 30.344 29.333 31.667 dn / dt<-4E-6 -1.02E-04 -1.015E-04 -1.02E-04 -1.02E-04

[0179] Table 13

[0180] 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, wherein the fifth lens has positive power and the sixth lens has negative power; 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 and a fifteenth lens; The fifth lens group includes, in order from the object side to the image side along the optical axis: a sixteenth lens and 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 negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The third lens has positive 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, wherein: The fourth lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The object side surface of the fifth lens is concave, and the image side surface is convex; The object side surface of the sixth lens is concave, and the image side surface is concave; The seventh lens element has positive refractive power, and its object side surface is convex.

4. The zoom lens according to claim 1, wherein: The eighth lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The ninth lens has negative optical power, its object side surface is convex, and its image side surface is concave; The tenth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The eleventh lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The twelfth lens has positive refractive power, and its object side surface is convex; The thirteenth lens has negative refractive power, and its image side surface is concave.

5. The zoom lens according to claim 1, wherein: The fourteenth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The fifteenth lens has negative optical power, and its image side surface is concave.

6. The zoom lens according to claim 1, wherein: The sixteenth lens has positive refractive power, its object side surface is concave, and its image side surface is convex; The seventeenth lens has positive or negative optical power, an object-side surface is convex, and an image-side surface is concave.

7. The zoom lens according to any one of claims 1 to 6, characterized in that: The zoom lens satisfies any one of the following conditional expressions: 3.5≤FG1 / Fw≤5.5, -2.0≤FG2 / Fw≤-1.0, 1.0≤FG3 / Fw≤2.5, 2.0≤FG4 / Fw≤4.0, -50≤FG5 / Fw≤60, 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, and Fw is the total effective focal length of the zoom lens when it is at the wide-angle end.

8. The zoom lens according to any one of claims 1 to 6, characterized in that: The zoom lens satisfies any one of the following conditional expressions: 1.5≤D2 / IH≤2.5, 0.1≤D2 / TTL≤0.4, 1.1≤D2 / Fw≤2.3, 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, 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 surface of the zoom lens, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

9. The zoom lens according to any one of claims 1 to 6, characterized in that: The zoom lens satisfies any one of the following conditional expressions: 50.0≤Vd G3 ≤75.0,1.85≤Nd G3 ≤2.1, Among them, Vd G3 is the Abbe number of at least one lens in the third lens group, Nd G3 is the refractive index of at least one lens in the third lens group.

10. The zoom lens according to any one of claims 1 to 6, characterized in that: The zoom lens satisfies any one of the following conditional expressions: 0≤TG4 / FG4≤0.3, 0.5≤Ft / FG1≤0.9, 0.8≤f8 / FG3≤1.8, 5.0≤TTL / IH≤8.0, 27.0≤TTL / (Ft / Fw)≤35.0, dn / dt<-4E-6, Wherein, TG4 is the thickness of the fourth lens group on the optical axis, FG4 is the effective focal length of the fourth lens group, Ft is the total effective focal length when the zoom lens is at the telephoto end, FG1 is the effective focal length of the first lens group, f8 is the effective focal length of the eighth lens, FG3 is the effective focal length of the third lens group, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the zoom lens, IH is the maximum image height of the zoom lens, Fw is the total effective focal length when the zoom lens is at the wide-angle end, and dn / dt is the relative refractive index temperature coefficient of the twelfth lens.

Images