CN118169857A

CN118169857A - Zoom lens

Info

Publication number: CN118169857A
Application number: CN202410578487.5A
Authority: CN
Inventors: 梁伟朝; 应永茂; 梁何
Original assignee: Sunny Optics Zhongshan Co Ltd
Current assignee: Sunny Optics Zhongshan Co Ltd
Priority date: 2024-05-10
Filing date: 2024-05-10
Publication date: 2024-06-11
Anticipated expiration: 2044-05-10
Also published as: CN118169857B

Abstract

The application discloses a zoom lens, which sequentially comprises from an object side to an image side along an optical axis: a first lens group having positive optical power; a second lens group having negative optical power; a third lens group having positive optical power; a fourth lens group having positive optical power; a fifth lens group having positive optical power; a sixth lens group having negative optical power; the first lens group to the fourth lens group are all zoom groups, the fifth lens group is a compensation group, and the sixth lens group is a fixed group; the first lens group to the fourth lens group respectively move between an object side and an image side along an optical axis so as to realize zooming between a wide-angle end and a long focal end; the fifth lens group moves between the object side and the image side along the optical axis to realize compensation of the image plane position change during zooming.

Description

Zoom lens

Technical Field

The application relates to the field of optical elements, in particular to a zoom lens.

Background

In recent years, with popularization of the internet and prevalence of social media, network video live broadcast has become one of the most common modes of information transmission in people's life, and demands for high-definition live broadcast lenses are increasing, so that demands of people on performances of the high-definition live broadcast lenses are also increasing. The design of the zoom lens enables a photographer to adjust the focal length by rotating the zoom ring under the condition of not moving the position, so that the zoom-in shooting of a remote target is realized, the wide-angle end is suitable for shooting of a wide scene, and the long-focus end is suitable for close-up of the remote target.

However, the following technical problems are generally existed in the existing zoom lens: 1) When the object distance is changed, the whole zooming process cannot form consistent and clear images, and quick focusing cannot be realized; 2) The zoom lens has small angle of view, poor imaging quality and large distortion; 3) The volume is larger and the structure is not compact enough.

At present, a zoom lens with one of the characteristics of wide object distance range, high resolution, small distortion value in the whole zooming process, wide field of view, large target surface, compact structure, and the like is still needed in the market.

Disclosure of Invention

An aspect of the present application provides a zoom lens sequentially including, from an object side to an image side along an optical axis: a first lens group having positive optical power; a second lens group having negative optical power; a third lens group having positive optical power; a fourth lens group having positive optical power; a fifth lens group having positive optical power; a sixth lens group having negative optical power; the first lens group to the fourth lens group are all zoom groups, the fifth lens group is a compensation group, and the sixth lens group is a fixed group; the first lens group to the fourth lens group respectively move between an object side and an image side along an optical axis so as to realize zooming between a wide-angle end and a long focal end; the fifth lens group moves between the object side and the image side along the optical axis to realize compensation of the image plane position change during zooming.

In one embodiment, the first lens group sequentially includes, along the optical axis from an object side to an image side: a first lens having positive optical power; and a second lens having negative optical power.

In one embodiment, the object-side and image-side surfaces of the first lens are both convex; and the object side surface of the second lens is a concave surface.

In one embodiment, the second lens group sequentially includes, along the optical axis from an object side to an image side: a third lens having negative optical power; a fourth lens having negative optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; and a seventh lens having negative optical power.

In one embodiment, the object side surface of the third lens element is convex, and the image side surface is concave; the object side surface and the image side surface of the fourth lens are concave surfaces; the image side surface of the fifth lens is a concave surface; the object side surface and the image side surface of the sixth lens are convex; and the object side surface of the seventh lens is a concave surface.

In one embodiment, the third lens group sequentially includes, along the optical axis from an object side to an image side: an eighth lens having positive optical power; a ninth lens having positive optical power; and a tenth lens having negative optical power.

In one embodiment, the object-side surface and the image-side surface of the eighth lens element are convex; the object side surface and the image side surface of the ninth lens are both convex surfaces; the object side surface and the image side surface of the tenth lens are concave.

In one embodiment, the fourth lens group sequentially includes, along the optical axis from an object side to an image side: an eleventh lens having positive optical power; a twelfth lens having positive optical power; a thirteenth lens having negative optical power; a fourteenth lens having positive optical power; a fifteenth lens having negative optical power; a sixteenth lens having positive optical power; and a seventeenth lens having negative optical power.

In one embodiment, the object-side and image-side surfaces of the eleventh lens are both convex; the object side surface and the image side surface of the twelfth lens are both convex surfaces; the object side surface and the image side surface of the thirteenth lens are concave surfaces; the object side surface and the image side surface of the fourteenth lens are convex; the object side surface of the fifteenth lens is a concave surface, and the image side surface is a convex surface; the object side surface of the sixteenth lens is a convex surface; and the seventeenth lens has a concave image-side surface.

In one embodiment, the fifth lens group sequentially includes, along the optical axis from an object side to an image side: an eighteenth lens having negative optical power; and a nineteenth lens having positive optical power.

In one embodiment, the object-side surface of the eighteenth lens is concave, and the image-side surface is convex; the object side surface and the image side surface of the nineteenth lens are both convex.

In one embodiment, the sixth lens group sequentially includes, along the optical axis from an object side to an image side: a twentieth lens having negative optical power; and a twenty-first lens having positive optical power.

In one embodiment, the object side and the image side of the twentieth lens are concave; the twenty-first lens element has a convex object-side surface and a concave image-side surface.

In one embodiment, the zoom lens satisfies: FG1/Fw is 3.41.ltoreq.Fw is 4.5, where FG1 is an effective focal length of the first lens group, and Fw is a total effective focal length when the zoom lens is at the wide-angle end.

In one embodiment, the zoom lens satisfies: -1.5 +.FG2/Fw +.0.8, 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.

In one embodiment, the zoom lens satisfies: 2.3.ltoreq.FG3/Fw.ltoreq.5.04, where FG3 is an effective focal length of the third lens group, and Fw is a total effective focal length when the zoom lens is at the wide-angle end.

In one embodiment, the zoom lens satisfies: FG4/Fw is 2.0.ltoreq.FG4.ltoreq.3.2, where FG4 is an effective focal length of the fourth lens group, and Fw is a total effective focal length when the zoom lens is at the wide-angle end.

In one embodiment, the zoom lens satisfies: 1.95.ltoreq.FG5/Fw.ltoreq.2.5, where FG5 is the effective focal length of the fifth lens group and Fw is the total effective focal length of the zoom lens at the wide-angle end.

In one embodiment, the zoom lens satisfies: ft/Fw is more than or equal to 2.25 and less than or equal to 2.8, wherein Ft is the total effective focal length when the zoom lens is at the long focal end, and Fw is the total effective focal length when the zoom lens is at the wide angle end.

In one embodiment, the zoom lens satisfies: ft/TTL is not more than 0.39 and not more than 0.5, wherein Ft is the total effective focal length when the zoom lens is at the long focal end, and TTL is the axial distance from the object side surface of the first lens to the imaging surface of the zoom lens.

In one embodiment, the zoom lens satisfies: fw/TTL is 0.15-0.2, wherein Fw is the total effective focal length of the zoom lens 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.

In one embodiment, the zoom lens satisfies: and d2/TTL is more than or equal to 8.57 and less than or equal to 13.18, wherein d2 is the moving distance between the object side and the image side of the second lens group when the zoom lens is switched between the wide angle end and the long focal end, and TTL is the axial distance from the object side of the first lens to the imaging surface of the zoom lens.

In one embodiment, the zoom lens satisfies: 13.4.ltoreq.d4/TTL.ltoreq.23.27, where d4 is a moving distance of the fourth lens group between the object side and the image side when the zoom lens is switched between the wide-angle end and the telephoto end, and TTL is an on-axis distance from the object side of the first lens to the imaging plane of the zoom lens.

In one embodiment, the zoom lens satisfies: 1.5.ltoreq.PhiG1/PhiI.ltoreq.1.8, wherein PhiG 1 is the maximum effective light-transmitting full caliber of the zoom lens in the zooming process, and PhiI is the diagonal length of the effective pixel area on the imaging surface of the zoom lens.

In one embodiment, the zoom lens satisfies: 0.48.ltoreq.f8/FG3.ltoreq.1.0, where f8 is an effective focal length of the eighth lens, FG3 is an effective focal length of the third lens group.

In one embodiment, the zoom lens satisfies: TG4/FG4 is 0.1-0.31, where TG4 is the distance on the optical axis from the object side of the eleventh lens to the image side of the seventeenth lens and FG4 is the effective focal length of the fourth lens group.

In one embodiment, the zoom lens satisfies: 0.04-2 XFt×tan (FOVt/2)/phi I is less than or equal to 0.06, wherein Ft is the total effective focal length of the zoom lens at the long focal end, FOVt is the maximum field angle of the zoom lens at the long focal end, and phi I is the diagonal length of the effective pixel area on the imaging surface of the zoom lens.

In one embodiment, the zoom lens satisfies: and 0.2-phi I/TTL-0.3, wherein phi I is the diagonal length of the effective pixel area on the imaging surface of the zoom lens, and TTL is the axial distance from the object side surface of the first lens to the imaging surface of the zoom lens.

In one embodiment, the zoom lens satisfies: -3.19 +.FG6/Fw +.1.77, where FG6 is the effective focal length of the sixth lens group and Fw is the total effective focal length of the zoom lens at the wide-angle end.

In another aspect, the application provides an electronic device. The electronic device comprises the zoom lens provided by the application and an imaging element for converting an optical image formed by the zoom lens into an electric signal.

The zoom lens provided by the embodiment of the application comprises six lens groups, wherein the first lens group is a zoom group, the fourth lens group is a compensation group, the sixth lens group is a fixed group, and at least one of high resolution, low distortion, large target surface, wide application range and the like of the zoom lens are achieved by reasonably setting the focal power and the action mode of the first lens group to the sixth lens group.

Drawings

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

fig. 1A and 1B are schematic structural views of a zoom lens according to embodiment 1 of the present application at a wide-angle end and a telephoto end, respectively;

fig. 1C and 1D are field curvature distortion diagrams at the wide-angle end and the telephoto end, respectively, of the zoom lens according to embodiment 1 of the present application;

fig. 2A and 2B are schematic structural views of a zoom lens according to embodiment 2 of the present application at a wide-angle end and a telephoto end, respectively;

Fig. 2C and 2D are field curvature distortion diagrams at the wide-angle end and the telephoto end, respectively, of the zoom lens according to embodiment 2 of the present application;

fig. 3A and 3B are schematic structural views of a zoom lens according to embodiment 3 of the present application at a wide-angle end and a telephoto end, respectively;

Fig. 3C and 3D are field curvature distortion diagrams at the wide-angle end and the telephoto end, respectively, of the zoom lens according to embodiment 3 of the present application;

Fig. 4A and 4B are schematic structural views of a zoom lens according to embodiment 4 of the present application at a wide-angle end and a telephoto end, respectively;

fig. 4C and 4D are field curvature distortion diagrams at the wide-angle end and the telephoto end, respectively, of the zoom lens according to embodiment 4 of the present application;

Fig. 5A and 5B are schematic structural views of a zoom lens according to embodiment 5 of the present application at a wide-angle end and a telephoto end, respectively; and

Fig. 5C and 5D are field curvature distortion diagrams at the wide angle end and at the telephoto end, respectively, of the zoom lens according to embodiment 5 of the present application.

Detailed Description

For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in the present 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 feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position 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 referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.

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

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

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

A zoom lens according to an exemplary embodiment of the present application may include six lens groups having optical power, a first lens group having positive optical power, a second lens group having negative optical power, and a third lens group having positive optical power, respectively; a fourth lens group having positive optical power, a fifth lens group having positive optical power, and a sixth lens group having negative optical power. The six lens groups are sequentially arranged from an object side to an image side along the optical axis, and the first lens group to the fourth lens group are all zoom groups which can move between the object side and the image side along the optical axis so as to enable the zoom lens to zoom between a wide-angle end and a long-focus end. The fifth lens group is a compensation group which moves between the object side and the image side along the optical axis so as to realize the compensation of the position change of the image plane in the zooming process; the sixth lens group is a fixed group whose distance with respect to the imaging plane is fixed.

In an exemplary embodiment, the number of lenses having optical power in the first lens group is two, and the first lens group sequentially includes, from an object side to an image side along the optical axis: a first lens having positive optical power and a second lens having negative optical power.

In an exemplary embodiment, the object-side surface and the image-side surface of the first lens are both convex, and the object-side surface of the second lens is concave.

In an exemplary embodiment, the first lens and the second lens may constitute a cemented doublet.

The first lens group comprises a positive lens and a negative lens, the first lens is a positive convex lens, and the second lens is a negative lens with a concave object side surface; the first lens group uses a lens combination with positive and negative matching, so that the correction of spherical aberration and chromatic aberration is facilitated and the lens resolution is improved while the light is rapidly converged.

In an exemplary embodiment, the number of lenses having optical power in the second lens group is five, and the second lens group sequentially includes, from an object side to an image side along the optical axis: a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power, a sixth lens with positive focal power and a seventh lens with negative focal power.

In an exemplary embodiment of the present application, the object-side surface of the third lens element is convex, and the image-side surface is concave; the object side surface and the image side surface of the fourth lens are concave surfaces; the image side surface of the fifth lens is a concave surface; the object side surface and the image side surface of the sixth lens are convex; and the object side surface of the seventh lens is a concave surface.

In an exemplary embodiment, the second lens group may include one double cemented lens and three negative lenses, and illustratively, the fifth lens and the sixth lens may form a double cemented lens, and a group of cemented lenses is provided to facilitate balancing of chromatic aberration of the position of the second lens group and improve overall resolution; the third lens, the fourth lens and the seventh lens are three negative lenses, which is favorable for gently diverging light, so that the lens can improve the resolution of the lens in the zooming process.

In an exemplary embodiment, the number of lenses having optical power in the third lens group is three, and the third lens group includes, in order from an object side to an image side along an optical axis: an eighth lens having positive optical power, a ninth lens having positive optical power, and a tenth lens having negative optical power.

In an exemplary embodiment, the object side surface and the image side surface of the eighth lens element are convex, the object side surface and the image side surface of the ninth lens element are convex, and the object side surface and the image side surface of the tenth lens element are concave.

In an exemplary embodiment, the third lens group may include two convex positive lenses, and illustratively, the eighth lens and the ninth lens are convex positive lenses; the third lens group may include one cemented lens, and illustratively, the ninth lens and the tenth lens may constitute a cemented doublet. The eighth lens is a convex positive lens, which is favorable for correcting field curvature, the ninth lens is a biconvex positive lens, which is favorable for reducing light height, and the cementing lens adopts the combination of the ninth lens with positive focal power and the tenth lens with negative focal power, which is favorable for mutual compensation of positive spherical aberration and negative spherical aberration and is favorable for improving the resolution of the system.

In an exemplary embodiment, the number of lenses having optical power in the fourth lens group is seven, and the fourth lens group includes, in order from an object side to an image side along the optical axis: an eleventh lens having positive power, a twelfth lens having positive power, a thirteenth lens having negative power, a fourteenth lens having positive power, a fifteenth lens having negative power, a sixteenth lens having positive power, and a seventeenth lens having negative power.

In an exemplary embodiment, the fourth lens group may include three cemented lenses and one positive lens; for example, the twelfth lens and the thirteenth lens may constitute a cemented doublet, the fourteenth lens and the fifteenth lens may constitute a cemented doublet, and the sixteenth lens and the seventeenth lens may constitute a cemented doublet. Providing a positive lens (i.e., eleventh lens) for compressing the light height, reducing tolerance sensitivity; and three cemented lenses are arranged, so that the off-axis chromatic aberration and aberration of three ends are balanced, and the overall resolution is improved.

In an exemplary embodiment, the object side surface and the image side surface of the eleventh lens are both convex; the object side surface and the image side surface of the twelfth lens are both convex surfaces; the object side surface and the image side surface of the thirteenth lens are concave surfaces; the object side surface and the image side surface of the fourteenth lens are convex; the object side surface of the fifteenth lens is a concave surface, and the image side surface is a convex surface; the object side surface of the sixteenth lens is a convex surface; and the seventeenth lens has a concave image-side surface.

In an exemplary embodiment, the number of lenses having optical power in the fifth lens group is two, and the fifth lens group sequentially includes, from an object side to an image side along an optical axis: an eighteenth lens having negative optical power and a nineteenth lens having positive optical power.

In an exemplary embodiment, the fifth lens group includes one glass aspherical lens and one positive lens; illustratively, the eighteenth lens is a glass aspheric lens, whose object-side surface is concave and whose image-side surface is convex; the nineteenth lens is a positive lens, and both the object side surface and the image side surface thereof are convex. The arrangement of the aspheric surface of the glass is beneficial to correcting distortion; and the arrangement of the positive lens is beneficial to smooth transition of light rays and improves the resolution of the lens.

In an exemplary embodiment, the number of lenses having optical power in the sixth lens group is two, and the sixth lens group includes, in order from an object side to an image side along the optical axis: a twentieth lens having negative optical power and a twenty-first lens having positive optical power. The sixth lens group comprising a positive lens and a negative lens is beneficial to correcting field curvature, raising light rays, reducing CRA and realizing large target surface effect.

In an exemplary embodiment, the object side and the image side of the twentieth lens are both concave; the twenty-first lens element has a convex object-side surface and a concave image-side surface.

The zoom lens can comprise five double-glued lenses, is beneficial to correcting chromatic aberration, is beneficial to reducing tolerance sensitivity and improves production yield.

In an exemplary embodiment, the zoom lens according to the present application further includes a stop disposed between the second lens group and the third lens group. The diaphragm moves along with the movable group, so that coma, spherical aberration and astigmatism of different focal length sections can be corrected, light entering the lens can be converged, the light height of the movable group behind the diaphragm can be reduced, and the caliber of the rear end of the lens can be reduced. In an exemplary embodiment of the present application, a diaphragm may be disposed between the seventh lens and the eighth lens. It should be noted, however, that the locations of the diaphragms disclosed herein are merely examples and not limiting; in alternative embodiments, the diaphragm may be arranged in other positions as desired.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: FG1/Fw is 3.41.ltoreq.Fw is 4.5, where FG1 is an effective focal length of the first lens group, and Fw is a total effective focal length when the zoom lens is at the wide-angle end. Satisfies FG1/Fw less than or equal to 3.41 and less than or equal to 4.5, reasonably controls the focal length of the first lens group and the total effective focal length when the zoom lens is at the wide-angle end, is beneficial to converging large-angle incident light into the optical system, effectively enlarges the field angle of the optical system, and enables the field angle to be more than or equal to 68 DEG at the wide-angle end.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: -1.5 +.FG2/Fw +.0.8, 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. Meets FG2/Fw of-1.5 and-0.8, and is beneficial to realizing imaging performance and ensuring the required zoom ratio in the zooming process by reasonably controlling the focal length value of the second lens group.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: 2.3.ltoreq.FG3/Fw.ltoreq.5.04, where FG3 is an effective focal length of the third lens group, and Fw is a total effective focal length when the zoom lens is at the wide-angle end. Satisfies FG3/Fw less than or equal to 2.3 and less than or equal to 5.04, reasonably distributes focal length values of the third lens group, is favorable for the third lens group to collect emergent rays of the second lens group, ensures smooth transition of optics, effectively reduces generation of aberration, and improves optical imaging quality.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: FG4/Fw is 2.0.ltoreq.FG4.ltoreq.3.2, where FG4 is an effective focal length of the fourth lens group, and Fw is a total effective focal length when the zoom lens is at the wide-angle end. Satisfies FG4/Fw less than or equal to 2.0 and less than or equal to 3.2, and ensures the required zoom ratio in the zooming process by reasonably controlling the focal length value of the fourth lens group, and can reduce the chromatic aberration and the aberration variation in the whole zooming process so as to obtain high imaging performance.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: 1.95.ltoreq.FG5/Fw.ltoreq.2.5, where FG5 is the effective focal length of the fifth lens group and Fw is the total effective focal length of the zoom lens at the wide-angle end. Satisfies FG5/Fw less than or equal to 1.95 and less than or equal to 2.5, ensures that the far and near object distance and different focal length sections are focused clearly by reasonably controlling the focal length value of the fifth lens group, and can reduce the change of spherical aberration and distortion in the whole zooming process so as to obtain high imaging performance.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: ft/Fw is more than or equal to 2.25 and less than or equal to 2.8, wherein Ft is the total effective focal length when the zoom lens is at the long focal end, and Fw is the total effective focal length when the zoom lens is at the wide angle end. Satisfies Ft/Fw of 2.25-2.8, and is beneficial to realizing zoom ratio of more than 2.3X.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: ft/TTL is not more than 0.39 and not more than 0.5, wherein Ft is the total effective focal length when the zoom lens is at the long focal end, and TTL is the axial distance from the object side surface of the first lens to the imaging surface of the zoom lens. The Ft/TTL which is more than or equal to 0.39 and less than or equal to 0.5 is satisfied, the length of the zoom lens can be effectively limited, and the miniaturization of the zoom lens is facilitated.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: fw/TTL is 0.15-0.2, wherein Fw is the total effective focal length of the zoom lens 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. The Fw/TTL is smaller than or equal to 0.15 and smaller than or equal to 0.2, the length of the zoom lens can be effectively limited, and further the miniaturization of the zoom lens is facilitated.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: and d2/TTL is more than or equal to 8.57 and less than or equal to 13.18, wherein d2 is the moving distance between the object side and the image side of the second lens group when the zoom lens is switched between the wide angle end and the long focal end, and TTL is the axial distance from the object side of the first lens to the imaging surface of the zoom lens. Satisfies d2/TTL less than or equal to 8.57 and less than or equal to 13.18, and ensures that the zoom lens has faster zooming speed.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: 13.4.ltoreq.d4/TTL.ltoreq.23.27, where d4 is a moving distance of the fourth lens group between the object side and the image side when the zoom lens is switched between the wide-angle end and the telephoto end, and TTL is an on-axis distance from the object side of the first lens to the imaging plane of the zoom lens. Satisfies that d4/TTL is less than or equal to 13.4 and less than or equal to 23.27, and ensures that the zoom lens has faster zooming speed.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: 1.5.ltoreq.PhiG1/PhiI.ltoreq.1.8, wherein PhiG 1 is the maximum effective light-transmitting full caliber of the zoom lens in the zooming process, and PhiI is the diagonal length of the effective pixel area on the imaging surface of the zoom lens. Satisfies 1.5-1.8 and is beneficial to the miniaturization of the zoom lens.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: 0.48.ltoreq.f8/FG3.ltoreq.1.0, where f8 is an effective focal length of the eighth lens, FG3 is an effective focal length of the third lens group. Satisfies f8/FG3 less than or equal to 0.48 and less than or equal to 1.0, and ensures that the eighth lens has a shorter focal length for light receiving, thereby ensuring the light quantity.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: TG4/FG4 is 0.1-0.31, where TG4 is the distance on the optical axis from the object side of the eleventh lens to the image side of the seventeenth lens and FG4 is the effective focal length of the fourth lens group. Satisfying the condition that TG4/FG4 is less than or equal to 0.1 and less than or equal to 0.31, facilitating smooth transition of light in the fourth lens group, facilitating lens resolution improvement and reducing tolerance sensitivity.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: 0.04-2 XFt×tan (FOVt/2)/phi I is less than or equal to 0.06, wherein Ft is the total effective focal length of the zoom lens at the long focal end, FOVt is the maximum field angle of the zoom lens at the long focal end, and phi I is the diagonal length of the effective pixel area on the imaging surface of the zoom lens. Satisfies 0.04-1-2 xFt tan (FOVt/2)/phi I-0.06, is beneficial to the approach of the ratio of the actual image height to the theoretical image height by controlling the relation between the system focal length and the field angle of the zoom lens at the long focal end, and is beneficial to the realization of low distortion.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: and 0.2-phi I/TTL-0.3, wherein phi I is the diagonal length of the effective pixel area on the imaging surface of the zoom lens, and TTL is the axial distance from the object side surface of the first lens to the imaging surface of the zoom lens. Satisfies 0.2-0.3 phi I/TTL, is beneficial to improving the resolution and reducing the cost. The phi I/TTL is smaller than the lower limit value of the expression, the aberration balance of the tele end is limited, and the resolution is difficult to promote. When phi I/TTL is larger than the expression upper limit value, the volume of the lens is increased, the zooming efficiency is low, and the cost is increased.

In an exemplary embodiment, the zoom lens according to the present application may satisfy: -3.19 +.FG6/Fw +.1.77, where FG6 is the effective focal length of the sixth lens group and Fw is the total effective focal length of the zoom lens at the wide-angle end. Meets FG6/Fw of-3.19 or less and Fw of-1.77 or less, has negative focal power of the fixed group, and is favorable for realizing the effect of large target surface.

In an exemplary embodiment, the first to twenty-first lenses may be spherical lenses or aspherical lenses. The application is not particularly limited to the specific number of spherical lenses and aspherical lenses, and can increase the number of aspherical lenses even if all lenses use aspherical lenses when focusing on the imaging quality. The aspherical lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, aberration generated during imaging can be eliminated as much as possible, and therefore imaging quality of the lens is improved. Optionally, the eighteenth lens is an aspherical lens, and the other lenses are all spherical lenses. More specifically, the eighteenth lens may be a meniscus glass aspherical lens, so that the field curvature and distortion at different focal lengths can be corrected.

The zoom lens has excellent resolution, and the resolution ratio is more than 8K.

The absolute distortion value |DIS| of the zoom lens is smaller than or equal to 5.1%, and the deformation of a shooting picture is small.

The zoom lens has the characteristic of large target surface, and the total image height can reach 43.2mm.

The zoom lens has wide object distance range capable of focusing, can ensure that the object distance can be focused clearly from 0.3m to infinity in the whole zooming process, and has good imaging effect.

The zoom lens can adopt a glass-plastic mixed structure, so that the design cost is reduced while the larger magnification is ensured.

The application is beneficial to the effect that the zoom lens has better capability of correcting optical aberration and chromatic aberration when being switched between a wide angle end and a long focal end by reasonably setting the focal power of each lens group and the focal power and the surface of each lens, and is beneficial to reducing the tolerance sensitivity of the system and improving the uniformity of pictures.

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

The zoom lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the above fifteen lenses, and may be adapted to an endoscope adaptation lens by reasonably distributing optical parameters such as optical power of each lens, surface type, center thickness of each lens, and on-axis spacing between each lens, so that the zoom lens provided by the present application has at least one of high resolution (8K), low distortion (|dis|5.1% or less), large target surface (total image height up to 43.2 mm), and wide object distance range (object distance 0.3m to infinity).

However, it will be appreciated by those skilled in the art that the number of lenses making up the zoom lens may be varied to achieve the various results and advantages described in the specification without departing from the technical solution claimed in the present application. For example, although the description has been made by taking 21 lenses as an example in the embodiment, the zoom lens is not limited to including 21 lenses. The zoom lens may also include other numbers of lenses, if desired.

Specific examples of the zoom lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

Example 1

A zoom lens 100 according to embodiment 1 of the present application is described below with reference to fig. 1A, 1B, 1C, and 1D. Fig. 1A is a schematic configuration diagram of a zoom lens 100 according to embodiment 1 of the present application at a wide-angle end, and fig. 1B is a schematic configuration diagram of the zoom lens 100 according to embodiment 1 of the present application at a telephoto end.

As shown in fig. 1A and 1B, the zoom lens 100 sequentially includes, from an object side to an image side: a first lens group G1 having positive power, a second lens group G2 having negative power, a stop STO, a third lens group G3 having positive power, a fourth lens group G4 having positive power, a fifth lens group G5 having positive power, a sixth lens group G6 having negative power, and an imaging plane IMA.

The first lens group G1 includes a first lens L1 and a second lens L2. The first lens element L1 has a positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element L2 has a negative refractive power, wherein an object-side surface S2 thereof is concave and an image-side surface S3 thereof is convex. The first lens L1 and the second lens L2 are cemented and form a cemented doublet.

The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The third lens element L3 has a negative refractive power, wherein an object-side surface S4 thereof is convex and an image-side surface S5 thereof is concave. The fourth lens element L4 has a negative refractive power, wherein an object-side surface S6 thereof is concave and an image-side surface S7 thereof is concave. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S8 thereof is convex and an image-side surface S9 thereof is concave. The sixth lens element L6 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The seventh lens element L7 with negative refractive power has a concave object-side surface S11 and a convex image-side surface S12. The fifth lens L5 and the sixth lens L6 are cemented and form one cemented doublet.

The third lens group G3 includes an eighth lens L8, a ninth lens L9, and a tenth lens L10. The eighth lens element L8 has a positive refractive power, wherein the object-side surface S14 thereof is convex, and the image-side surface S15 thereof is convex. The ninth lens element L9 with positive refractive power has a convex object-side surface S16 and a convex image-side surface S17. The tenth lens L10 has negative refractive power, wherein an object-side surface S17 thereof is concave, and an image-side surface S18 thereof is concave. The ninth lens L9 and the tenth lens L10 are cemented and form a cemented doublet.

The fourth lens group G4 includes an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, a sixteenth lens L16, and a seventeenth lens L17. The eleventh lens element L11 has a positive refractive power, wherein the object-side surface S19 thereof is convex, and the image-side surface S20 thereof is convex. The twelfth lens element L12 has a positive refractive power, wherein the object-side surface S21 thereof is convex and the image-side surface S22 thereof is convex. The thirteenth lens element L13 has a negative refractive power, wherein the object-side surface S22 is concave and the image-side surface S23 is concave. The fourteenth lens element L14 has a positive refractive power, wherein an object-side surface S24 thereof is convex, and an image-side surface S25 thereof is convex. The fifteenth lens element L15 has a negative refractive power, wherein an object-side surface S25 thereof is concave and an image-side surface S26 thereof is convex. The sixteenth lens element L16 has a positive refractive power, wherein an object-side surface S27 thereof is convex, and an image-side surface S28 thereof is convex. The seventeenth lens L17 may have a negative refractive power, wherein an object-side surface S28 is concave, and an image-side surface S29 is concave. The twelfth lens L12 and the thirteenth lens L13 are cemented and form one doublet, the fourteenth lens L14 and the fifteenth lens L15 are cemented and form one doublet, and the sixteenth lens L16 and the seventeenth lens are cemented and form one doublet.

The fifth lens group G5 includes an eighteenth lens L18 and a nineteenth lens L19. The eighteenth lens element L18 has a negative refractive power, wherein the object-side surface S30 is concave and the image-side surface S31 is convex. The nineteenth lens L19 may have a positive refractive power, wherein an object-side surface S32 thereof is convex, and an image-side surface S33 thereof is convex.

The sixth lens group G6 includes a twenty-first lens L21 and a twenty-second lens L20. The twentieth lens L20 may have a negative optical power, wherein the object-side surface S34 is concave and the image-side surface S35 is concave. The twenty-first lens element L21 can have positive refractive power, wherein the object-side surface S36 thereof is convex and the image-side surface S37 thereof is concave.

A stop STO may be disposed between the second lens group G2 and the third lens group G3, and more specifically, a stop STO may be disposed between the seventh lens L7 and the eighth lens L8.

Light from the object sequentially passes through the surfaces (i.e., sequentially passes through the first lens L1 to the twenty-first lens L21) and is finally imaged on the imaging plane IMA, where an image sensing chip may be disposed.

Table 1 shows a basic parameter table of the zoom lens 100 of embodiment 1, wherein the units of radius of curvature and thickness/distance are each millimeters (mm).

TABLE 1

In embodiment 1, the object side surface S30 and the image side surface S31 of the eighteenth lens L18 are aspherical, and the surface shape x of the aspherical lens can be defined by, but not limited to, the following aspherical formula:

（1）

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The cone coefficients k and the higher order coefficients A4, A6, A8, a10 and a12 that can be used for each of the aspherical mirror faces S30, S31 in example 1 are given in table 2 below.

TABLE 2

Table 3 shows values of T0, T1, T2, T3, and T4 in table 1 when the zoom lens 100 is at the wide-angle end, the middle-focus end, and the telephoto end, respectively. Table 3 also shows the values of the total effective focal length F, the aperture value Fno, and the distortion DIS of the zoom lens 100 of embodiment 1.

TABLE 3 Table 3

Fig. 1C is a field curvature distortion diagram when the zoom lens 100 of embodiment 1 is at the wide-angle end, and fig. 1D is a field curvature distortion diagram when the zoom lens 100 of embodiment 1 is at the telephoto end. As can be seen from fig. 1C and 1D, the zoom lens 100 according to embodiment 1 achieves good imaging quality in different focal length states.

Example 2

A zoom lens 200 according to embodiment 2 of the present application is described below with reference to fig. 2A, 2B, 2C, and 2D. Fig. 2A is a schematic structural view of the zoom lens 200 according to embodiment 2 of the present application at the wide-angle end, and fig. 2B is a schematic structural view of the zoom lens 200 according to embodiment 2 of the present application at the telephoto end.

In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity.

As shown in fig. 2A and 2B, the zoom lens 200 sequentially includes, from an object side to an image side: a first lens group G1 having positive power, a second lens group G2 having negative power, a stop STO, a third lens group G3 having positive power, a fourth lens group G4 having positive power, a fifth lens group G5 having positive power, a sixth lens group G6 having negative power, and an imaging plane IMA.

The first lens group G1 includes a first lens L1 and a second lens L2. The first lens element L1 has a positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element L2 has a negative refractive power, wherein an object-side surface S2 thereof is concave, and an image-side surface S3 thereof is concave. The first lens L1 and the second lens L2 are cemented and form a cemented doublet.

The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The third lens element L3 has a negative refractive power, wherein an object-side surface S4 thereof is convex and an image-side surface S5 thereof is concave. The fourth lens element L4 has a negative refractive power, wherein an object-side surface S6 thereof is concave and an image-side surface S7 thereof is concave. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S8 thereof is concave and an image-side surface S9 thereof is concave. The sixth lens element L6 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The seventh lens element L7 with negative refractive power has a concave object-side surface S11 and a convex image-side surface S12. The fifth lens L5 and the sixth lens L6 are cemented and form one cemented doublet.

The fourth lens group G4 includes an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, a fifteenth lens L15, a sixteenth lens L16, and a seventeenth lens L17. The eleventh lens element L11 has a positive refractive power, wherein the object-side surface S19 thereof is convex, and the image-side surface S20 thereof is convex. The twelfth lens element L12 has a positive refractive power, wherein the object-side surface S21 thereof is convex and the image-side surface S22 thereof is convex. The thirteenth lens element L13 has a negative refractive power, wherein the object-side surface S22 is concave and the image-side surface S23 is concave. The fourteenth lens element L14 has a positive refractive power, wherein an object-side surface S24 thereof is convex, and an image-side surface S25 thereof is convex. The fifteenth lens element L15 has a negative refractive power, wherein an object-side surface S25 thereof is concave and an image-side surface S26 thereof is convex. The sixteenth lens element L16 has a positive refractive power, wherein an object-side surface S27 thereof is convex and an image-side surface S28 thereof is concave. The seventeenth lens L17 may have a negative refractive power, wherein an object-side surface S28 is convex and an image-side surface S29 is concave. The twelfth lens L12 and the thirteenth lens L13 are cemented and form one doublet, the fourteenth lens L14 and the fifteenth lens L15 are cemented and form one doublet, and the sixteenth lens L16 and the seventeenth lens are cemented and form one doublet.

Table 4 shows a basic parameter table of the zoom lens 200 of embodiment 2, wherein the units of radius of curvature and thickness/distance are each millimeters (mm). Table 5 shows cone coefficients and higher order coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical surface profile can be defined by the formula (1) given in example 1 above.

TABLE 4 Table 4

TABLE 5

Table 6 shows values of T0, T1, T2, T3, and T4 in table 3 when the zoom lens 200 is at the wide-angle end, the middle-focus end, and the telephoto end, respectively. Table 6 also shows the values of the total effective focal length F, the aperture value Fno, and the distortion DIS of the zoom lens 200 of embodiment 2.

TABLE 6

Fig. 2C is a field curvature distortion map when the zoom lens 200 of embodiment 2 is at the wide-angle end, and fig. 2D is a field curvature distortion map when the zoom lens 200 of embodiment 2 is at the telephoto end. As can be seen from fig. 2C and 2D, the zoom lens 200 according to embodiment 2 can achieve good imaging quality in different focal length states.

Example 3

A zoom lens 300 according to embodiment 3 of the present application is described below with reference to fig. 3A,3B, 3C, and 3D. Fig. 3A is a schematic structural view of the zoom lens 300 according to embodiment 3 of the present application at the wide-angle end, and fig. 3B is a schematic structural view of the zoom lens 300 according to embodiment 3 of the present application at the telephoto end.

As shown in fig. 3A and 3B, the zoom lens 300 sequentially includes, from an object side to an image side: a first lens group G1 having positive power, a second lens group G2 having negative power, a stop STO, a third lens group G3 having positive power, a fourth lens group G4 having positive power, a fifth lens group G5 having positive power, a sixth lens group G6 having negative power, and an imaging plane IMA.

Table 7 shows a basic parameter table of the zoom lens 300 of embodiment 3, wherein the units of radius of curvature and thickness/distance are each millimeters (mm). Table 8 shows cone coefficients and higher order coefficients that can be used for each aspherical mirror surface in example 3, where each aspherical surface profile can be defined by the formula (1) given in example 1 above.

TABLE 7

TABLE 8

Table 9 shows values of T0, T1, T2, T3, and T4 in table 7 when the zoom lens 300 is at the wide-angle end, the middle-focus end, and the telephoto end, respectively. Table 9 also shows the values of the total effective focal length F, the aperture value Fno, and the distortion DIS of the zoom lens 300 of embodiment 3.

TABLE 9

Fig. 3C is a field curvature distortion map when the zoom lens 300 of embodiment 3 is at the wide-angle end, and fig. 3D is a field curvature distortion map when the zoom lens 300 of embodiment 3 is at the telephoto end. As can be seen from fig. 3C and 3D, the zoom lens 300 according to embodiment 3 achieves good imaging quality in different focal length states.

Example 4

A zoom lens 400 according to embodiment 4 of the present application is described below with reference to fig. 4A, 4B, 4C, and 4D. Fig. 4A is a schematic structural view of the zoom lens 400 according to embodiment 4 of the present application at the wide-angle end, and fig. 4B is a schematic structural view of the zoom lens 400 according to embodiment 4 of the present application at the telephoto end.

As shown in fig. 4A and 4B, the zoom lens 400 sequentially includes, from an object side to an image side: a first lens group G1 having positive power, a second lens group G2 having negative power, a stop STO, a third lens group G3 having positive power, a fourth lens group G4 having positive power, a fifth lens group G5 having positive power, a sixth lens group G6 having negative power, and an imaging plane IMA.

The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The third lens element L3 has a negative refractive power, wherein an object-side surface S4 thereof is convex and an image-side surface S5 thereof is concave. The fourth lens element L4 has a negative refractive power, wherein an object-side surface S6 thereof is concave and an image-side surface S7 thereof is concave. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S8 thereof is concave and an image-side surface S9 thereof is concave. The sixth lens element L6 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10. The seventh lens element L7 with negative refractive power has a concave object-side surface S11 and a concave image-side surface S12. The fifth lens L5 and the sixth lens L6 are cemented and form one cemented doublet.

Table 10 shows a basic parameter table of the zoom lens 400 of embodiment 4, wherein the units of radius of curvature and thickness/distance are each millimeters (mm). Table 11 shows cone coefficients and higher order term coefficients that can be used for each aspherical mirror surface in example 4, where each aspherical surface profile can be defined by the formula (1) given in example 1 above.

Table 10

TABLE 11

Table 12 shows values of T0, T1, T2, T3, and T4 in table 10 when the zoom lens 400 is at the wide-angle end, the middle-focus end, and the telephoto end, respectively. Table 12 also shows the values of the total effective focal length F, the aperture value Fno, and the distortion DIS of the zoom lens 400 of embodiment 4.

Table 12

Fig. 4C is a field curvature distortion diagram when the zoom lens 400 of embodiment 4 is at the wide-angle end, and fig. 4D is a field curvature distortion diagram when the zoom lens 400 of embodiment 4 is at the telephoto end. As can be seen from fig. 4C and 4D, the zoom lens 400 according to embodiment 4 achieves good imaging quality in different focal length states.

Example 5

A zoom lens 500 according to embodiment 5 of the present application is described below with reference to fig. 5A, 5B, 5C, and 5D. Fig. 5A is a schematic structural view of the zoom lens 500 according to embodiment 5 of the present application at the wide-angle end, and fig. 5B is a schematic structural view of the zoom lens 500 according to embodiment 5 of the present application at the telephoto end.

As shown in fig. 5A and 5B, the zoom lens 500 sequentially includes, from an object side to an image side: a first lens group G1 having positive power, a second lens group G2 having negative power, a stop STO, a third lens group G3 having positive power, a fourth lens group G4 having positive power, a fifth lens group G5 having positive power, a sixth lens group G6 having negative power, and an imaging plane IMA.

Table 13 shows a basic parameter table of a zoom lens 500 of embodiment 5, wherein both the radius of curvature and the thickness/distance are in millimeters (mm). Table 14 shows cone coefficients and higher order term coefficients that can be used for each aspherical mirror surface in example 5, where each aspherical surface profile can be defined by the formula (1) given in example 1 above.

TABLE 13

TABLE 14

Table 15 shows values of T0, T1, T2, T3, and T4 in table 13 when the zoom lens 500 is at the wide-angle end, the middle-focus end, and the telephoto end, respectively. Table 15 also shows the values of the total effective focal length F, the aperture value Fno, and the distortion DIS of the zoom lens 500 of embodiment 5.

TABLE 15

Fig. 5C is a field curvature distortion map when the zoom lens 500 of embodiment 5 is at the wide-angle end, and fig. 5D is a field curvature distortion map when the zoom lens 500 of embodiment 5 is at the telephoto end. As can be seen from fig. 5C and 5D, the zoom lens 500 according to embodiment 5 achieves good imaging quality in different focal length states.

In summary, examples 1 to 5 satisfy the relationships shown in table 16, respectively.

Table 16

The present application also provides an electronic device that may include the zoom lens according to the above-described embodiment of the present application and an imaging element for converting an optical image formed by the zoom lens into an electrical signal.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

1. The zoom lens is characterized by comprising, in order from an object side to an image side along an optical axis:

A first lens group having positive optical power;

A second lens group having negative optical power;

a third lens group having positive optical power;

a fourth lens group having positive optical power;

a fifth lens group having positive optical power;

a sixth lens group having negative optical power;

Wherein,

The first lens group to the fourth lens group are all zoom groups, the fifth lens group is a compensation group, and the sixth lens group is a fixed group;

the first lens group to the fourth lens group are respectively moved between the object side and the image side along the optical axis to realize zooming between a wide-angle end and a telephoto end;

the fifth lens group moves between the object side and the image side along the optical axis to compensate for the change of the image plane position during zooming.

2. The zoom lens of claim 1, wherein the first lens group sequentially comprises, along the optical axis from the object side to the image side:

a first lens having positive optical power, both the object-side surface and the image-side surface of which are convex; and

The object side surface of the second lens with negative focal power is concave.

3. The zoom lens of claim 1, wherein the second lens group sequentially comprises, along the optical axis from the object side to the image side:

a third lens having negative optical power;

A fourth lens having negative optical power;

A fifth lens having negative optical power;

A sixth lens having positive optical power; and

A seventh lens having negative optical power.

4. A zoom lens according to claim 3, wherein,

The object side surface of the third lens is a convex surface, and the image side surface is a concave surface;

the object side surface and the image side surface of the fourth lens are concave surfaces;

The image side surface of the fifth lens is a concave surface;

The object side surface and the image side surface of the sixth lens are both convex surfaces; and

The object side surface of the seventh lens is a concave surface.

5. The zoom lens according to claim 1, wherein the third lens group sequentially includes, along the optical axis from the object side to the image side:

An eighth lens element with positive refractive power having convex object-side and image-side surfaces;

a ninth lens element having positive refractive power, both the object-side surface and the image-side surface of the ninth lens element being convex; and

The tenth lens with negative focal power has concave object side and concave image side.

6. The zoom lens of claim 1, wherein the fourth lens group sequentially comprises, along the optical axis from the object side to the image side:

An eleventh lens having positive optical power;

A twelfth lens having positive optical power;

a thirteenth lens having negative optical power;

A fourteenth lens having positive optical power;

a fifteenth lens having negative optical power;

a sixteenth lens having positive optical power; and

A seventeenth lens having negative optical power.

7. The zoom lens of claim 6, wherein the lens is configured to,

The object side surface and the image side surface of the eleventh lens are both convex surfaces;

The object side surface and the image side surface of the twelfth lens are both convex surfaces;

the object side surface and the image side surface of the thirteenth lens are concave surfaces;

the object side surface and the image side surface of the fourteenth lens are both convex surfaces;

The object side surface of the fifteenth lens is a concave surface, and the image side surface is a convex surface;

The object side surface of the sixteenth lens is a convex surface; and

The seventeenth lens has a concave image-side surface.

8. The zoom lens according to claim 1, wherein the fifth lens group sequentially comprises, along the optical axis from the object side to the image side:

an eighteenth lens with negative focal power, wherein the object side surface of the eighteenth lens is a concave surface, and the image side surface of the eighteenth lens is a convex surface; and

A nineteenth lens having positive optical power has convex object-side and image-side surfaces.

9. The zoom lens of claim 1, wherein the sixth lens group sequentially comprises, along the optical axis from the object side to the image side:

A twentieth lens having negative optical power, both the object-side surface and the image-side surface of which are concave surfaces; and

The twenty-first lens element with positive refractive power has a convex object-side surface and a concave image-side surface.

10. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: FG1/Fw is 3.41.ltoreq.Fw is 4.5, where FG1 is an effective focal length of the first lens group and Fw is a total effective focal length when the zoom lens is at a wide-angle end.

11. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: -1.5 +.FG2/Fw +.0.8, 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.

12. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: 2.3.ltoreq.FG3/Fw.ltoreq.5.04, where FG3 is an effective focal length of the third lens group, fw is a total effective focal length when the zoom lens is at a wide-angle end.

13. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: 2.0.ltoreq.FG4/Fw.ltoreq.3.2, where FG4 is an effective focal length of the fourth lens group and Fw is a total effective focal length when the zoom lens is at the wide-angle end.

14. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: 1.95.ltoreq.FG5/Fw.ltoreq.2.5, where FG5 is an effective focal length of the fifth lens group and Fw is a total effective focal length when the zoom lens is at the wide-angle end.

15. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: ft/Fw is more than or equal to 2.25 and less than or equal to 2.8, wherein Ft is the total effective focal length when the zoom lens is at the long focal end, and Fw is the total effective focal length when the zoom lens is at the wide angle end.

16. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: ft/TTL is not less than 0.39 and not more than 0.5, wherein Ft is the total effective focal length when the zoom lens is positioned at the long focal end, and TTL is the axial distance from the object side surface of the first lens to the imaging surface of the zoom lens.

17. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: fw/TTL is not less than 0.15 and not more than 0.2, wherein Fw is the total effective focal length of the zoom lens 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.

18. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: and d2 is more than or equal to 8.57 and less than or equal to 13.18/TTL, wherein d2 is the moving distance of the second lens group between the object side and the image side when the zoom lens is switched between a wide angle end and a long focal end, and TTL is the axial distance from the object side of the first lens to the imaging surface of the zoom lens.

19. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: 13.4.ltoreq.d4/TTL.ltoreq.23.27, wherein d4 is a moving distance of the fourth lens group between the object side and the image side when the zoom lens is switched between a wide angle end and a telephoto end, and TTL is an on-axis distance from the object side of the first lens to an imaging surface of the zoom lens.

20. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: 1.5.ltoreq.PhiG1/PhiI.ltoreq.1.8, wherein PhiG 1 is the maximum effective light-transmitting full caliber of the zoom lens in the zooming process, and PhiI is the diagonal length of an effective pixel area on an imaging surface of the zoom lens.

21. The zoom lens of claim 5, wherein the lens is configured to,

The zoom lens satisfies the following conditions: 0.48.ltoreq.f8/FG3.ltoreq.1.0, wherein f8 is an effective focal length of the eighth lens, FG3 is an effective focal length of the third lens group.

22. The zoom lens according to any one of claims 6 or 7, wherein,

The zoom lens satisfies the following conditions: and 0.1.ltoreq.TG 4/FG4.ltoreq.0.31, wherein TG4 is a distance on the optical axis from an object side surface of the eleventh lens to an image side surface of the seventeenth lens, FG4 is an effective focal length of the fourth lens group.

23. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: 0.04-1×Ft×tan (FOVt/2)/ΦI-0.06, wherein Ft is total effective focal length of the zoom lens at long focal end, FOVt is maximum field angle of the zoom lens at long focal end, and ΦI is diagonal length of effective pixel region on imaging plane of the zoom lens.

24. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: and 0.2-phi I/TTL-0.3, wherein phi I is the diagonal length of an effective pixel area on the imaging surface of the zoom lens, and TTL is the axial distance from the object side surface of the first lens to the imaging surface of the zoom lens.

25. The zoom lens according to any one of claims 1 to 9, wherein,

The zoom lens satisfies the following conditions: -3.19 +.FG6/Fw +.1.77, where FG6 is the effective focal length of the sixth lens group and Fw is the total effective focal length of the zoom lens at the wide-angle end.