Zoom lens

Abstract

The invention discloses a zoom lens. The zoom lens sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power and a fifth lens group with focal power from an object side to an image side along an optical axis, the first lens group, the third lens group and the fifth lens group are fixed groups, the second lens group is a zoom group, and the fourth lens group is a compensation group; wherein the first lens group sequentially comprises a first lens, a second lens, a third lens and a fourth lens along the optical axis from the object side to the image side; the second lens group sequentially comprises 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 and a twelfth lens; the fourth lens group sequentially comprises a thirteenth lens and a fourteenth lens; the fifth lens group sequentially comprises a fifteenth lens and a sixteenth 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] With the development of modern society and the advancement of science and technology, zoom lenses are widely used in all aspects of life because their focal length can be continuously changed within a certain range and can adapt to the usage requirements of different scenarios. At the same time, people's performance requirements for zoom lenses are getting higher and higher.

[0003] However, the following problems still exist in existing zoom lenses: 1) When the object distance changes, the image cannot be consistently clear throughout the zoom process, and fast focusing cannot be achieved; 2) The image quality is poor and the distortion is large, resulting in deformation of the photographed people or scenes, and the scene cannot be truly restored; 3) The lens is large in size and the structure is not compact enough, which is not conducive to miniaturization. Summary of the invention

[0004] 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, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens with positive optical power, and a fifth lens group with optical power; the first lens group, the third lens group, and the fifth lens group are fixed groups, the second lens group is a zoom group, and the fourth lens group is a compensation group; 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, a third lens, and a fourth lens; the second lens group comprises, in order from the object side to the image side along the optical axis: The fifth lens, the sixth lens and the seventh lens; the third lens group includes, in order from the object side to the image side along the optical axis: the eighth lens, the ninth lens, the tenth lens, the eleventh lens and the twelfth lens; the fourth lens group includes, in order from the object side to the image side along the optical axis: the thirteenth lens and the fourteenth lens; the fifth lens group includes, in order from the object side to the image side along the optical axis: the fifteenth lens and the sixteenth 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 position of the imaging surface during zooming.

[0005] According to an exemplary embodiment of the present application, the first lens has negative power; the second lens has positive power; the third lens has positive power; and the fourth lens has positive power.

[0006] According to an exemplary embodiment of the present application, the fifth lens has negative power; the sixth lens has negative power; and the seventh lens has positive power.

[0007] According to an exemplary embodiment of the present application, the eighth lens has positive power; the ninth lens has positive power; the tenth lens has negative power; the eleventh lens has negative power; and the twelfth lens has positive power.

[0008] According to an exemplary embodiment of the present application, the fifteenth lens has negative power; and the sixteenth lens has positive power.

[0009] According to an exemplary embodiment of the present application, the fourth lens group further includes a first auxiliary lens, and the first auxiliary lens is located on the object side of the thirteenth lens.

[0010] According to an exemplary embodiment of the present application, the first auxiliary lens has negative optical power.

[0011] According to an exemplary embodiment of the present application, the fifth lens group further includes a second auxiliary lens, and the second auxiliary lens is located between the fifteenth lens and the sixteenth lens.

[0012] According to an exemplary embodiment of the present application, the second auxiliary lens has positive power.

[0013] According to an exemplary embodiment of the present application, the zoom lens satisfies: 2.1≤FG1 / Fw≤3.1, 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.

[0014] According to an exemplary embodiment of the present application, the zoom lens satisfies: -1≤FG2 / Fw≤-0.5, 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.

[0015] According to an exemplary embodiment of the present application, the zoom lens satisfies: 0.9≤FG3 / Fw≤1.7, 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.

[0016] According to an exemplary embodiment of the present application, the zoom lens satisfies: 1≤FG4 / Fw≤3, wherein FG4 is the effective focal length of the fourth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0017] According to an exemplary embodiment of the present application, the zoom lens satisfies: 3≤|FG5 / Fw|≤13, 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.

[0018] According to an exemplary embodiment of the present application, the zoom lens satisfies: 2≤Ft / Fw≤3.5, wherein Ft is the total effective focal length of the zoom lens at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

[0019] According to an exemplary embodiment of the present application, the zoom lens satisfies: 0.4≤Ft / TTL≤0.8, wherein Ft is the total effective focal length of the zoom lens at the telephoto end, and TTL is the axial distance from the object side of the first lens to the imaging surface of the zoom lens.

[0020] According to an exemplary embodiment of the present application, the zoom lens satisfies: 0.15≤Fw / TTL≤0.4, 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 of the first lens to the imaging surface of the zoom lens.

[0021] According to an exemplary embodiment of the present application, the zoom lens satisfies: 5.75≤TTL / d2≤8, wherein TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the zoom lens, and d2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end.

[0022] According to an exemplary embodiment of the present application, the zoom lens satisfies: 0.3≤100*d4 / TTL≤3.5, 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 d4 is the on-axis distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end.

[0023] According to an exemplary embodiment of the present application, the zoom lens satisfies: 3.5≤ΦG1 / H≤5.6, wherein ΦG1 is the maximum full aperture of the lenses in the first lens group, and H is the full image height of the zoom lens.

[0024] According to an exemplary embodiment of the present application, the zoom lens satisfies: -3.9≤f7 / FG2≤-1.9, wherein f7 is the effective focal length of the seventh lens, and FG2 is the effective focal length of the second lens group.

[0025] According to an exemplary embodiment of the present application, the zoom lens satisfies: 0<|f16 / FG5|≤3.3, wherein f16 is the effective focal length of the sixteenth lens, and FG5 is the effective focal length of the fifth lens group.

[0026] According to an exemplary embodiment of the present application, the zoom lens satisfies: 0<1-2Ft*tan(FOV_t / 2) / H≤0.045, wherein Ft is the total effective focal length of the zoom lens at the telephoto end, and FOV_t is the full field of view angle of the zoom lens at the telephoto end.

[0027] According to an exemplary embodiment of the present application, the zoom lens satisfies: 4.3≤TTL / H≤5, wherein TTL is the axial distance from the object side surface of the first lens to the imaging surface of the zoom lens, and H is the total image height of the zoom lens.

[0028] According to an exemplary embodiment of the present application, the zoom lens satisfies at least one of the following: 2.2≤FG1 / Fw≤2.95; -1≤FG2 / Fw≤-0.55; 0.95≤FG3 / Fw≤1.58; 1.25≤FG4 / Fw≤2.7; 3.3≤|FG5 / Fw|≤12.6; 2.0≤Ft / Fw≤3.2; 0.4≤Ft / TTL≤0.7; 0.15≤Fw / TTL≤0.2 5; 6≤TTL / d2≤7.8; 0.3≤100*d4 / TTL≤3.2; 3.75≤ΦG1 / H≤5.35; -3.7≤f7 / FG2≤-2.2; 0<|f16 / FG5|≤0.55; 0<1-2Ft*tan(FOV_t / 2) / H≤0.04; 4.4≤TTL / H≤4.7; Wherein, FG1 is the effective focal length of the first lens group, and FG2 is the effective focal length of the second lens group effective focal length, FG3 is the effective focal length of the third lens group, FG4 is the effective focal length of the fourth lens group, FG5 is the effective focal length of the fifth lens group, Fw is the total effective focal length when the zoom lens is at the wide-angle end, Ft is the total effective focal length when the zoom lens is at the telephoto end, TTL is the axial distance from the object side of the first lens to the imaging surface of the zoom lens, ΦG1 is the maximum full aperture of the lenses in the first lens group, H is the full image height of the zoom lens, 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, d4 ​​is the axial distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end, f7 is the effective focal length of the seventh lens, f16 is the effective focal length of the sixteenth lens, and FOV_t is the full field of view when the zoom lens is at the telephoto end.

[0029] The zoom lens of the present application adopts a five-group structure of fixed + zoom + fixed + compensation + fixed. By reasonably setting the optical focal length, number of lenses 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, clear focus at long and short object distances, clear imaging, large field of view, wide field of view, small distortion value throughout the zoom range, and small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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:

[0031] Figure 1 is a schematic structural diagram of a zoom lens according to Embodiment 1 of the present application when it is at a wide-angle end;

[0032] Figure 2 is a schematic structural diagram of a zoom lens according to Embodiment 1 of the present application when it is at a telephoto end;

[0033] Figure 3 is a distortion diagram of the zoom lens according to Embodiment 1 of the present application when it is at the wide-angle end;

[0034] Figure 4 is a distortion diagram of the zoom lens according to Embodiment 1 of the present application when it is at the telephoto end;

[0035] Figure 5 is a schematic structural diagram of a zoom lens according to Embodiment 2 of the present application when it is at a wide-angle end;

[0036] Figure 6 is a schematic structural diagram of a zoom lens according to Embodiment 2 of the present application when it is at a telephoto end;

[0037] Figure 7 is a distortion diagram of the zoom lens according to Embodiment 2 of the present application when it is at the wide-angle end;

[0038] Figure 8 is a distortion diagram of the zoom lens according to Embodiment 2 of the present application when it is at the telephoto end;

[0039] Fig. 9 is a schematic structural diagram of a zoom lens according to Embodiment 3 of the present application when it is at a wide-angle end;

[0040] Fig.10 is a schematic structural diagram of a zoom lens according to Embodiment 3 of the present application when it is at a telephoto end;

[0041] Fig.11 is a distortion diagram of the zoom lens according to Embodiment 3 of the present application when it is at the wide-angle end;

[0042] Fig.12 is a distortion diagram of the zoom lens according to Embodiment 3 of the present application when it is at the telephoto end;

[0043] Fig.13 is a schematic structural diagram of a zoom lens at a wide-angle end according to Embodiment 4 of the present application;

[0044] Fig.14 is a schematic structural diagram of a zoom lens according to Embodiment 4 of the present application when it is at a telephoto end;

[0045] Fig.15 is a distortion diagram of the zoom lens according to Example 4 of the present application when it is at the wide-angle end;

[0046] Fig.16This is a distortion diagram when the zoom lens according to Example 4 of the present application is at the telephoto end. DETAILED DESCRIPTION

[0047] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0048] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

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

[0050] In this article, the paraxial 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.

[0051] It should also be understood that the terms "including", "having", "comprising", etc., 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 a statement such as "at least one of..." appears after a list of listed features, it modifies the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

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

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

[0054] The zoom lens according to the exemplary embodiment of the present application may include five lens groups with optical power in order from the object side to the image side along the optical axis, namely the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group. Among them, the first lens group, the third lens group and the fifth lens group are fixed groups, which can be fixed relative to the position of the imaging surface of the zoom lens; the second lens group is a zoom group, the fourth lens group is a compensation group, and the second lens group and the fourth lens group can move between the object side and the image side along the optical axis.

[0055] In an exemplary embodiment, the first lens group of the zoom lens has positive optical power, which is beneficial for correcting the aberration and distortion of the system, while reducing the tolerance sensitivity and ensuring the uniformity of the image.

[0056] In an exemplary embodiment, the first lens group may include a doublet lens and two positive lenses. Exemplarily, the first lens group may include: a first lens, a second lens, a third lens and a fourth lens in order from the object side to the image side along the optical axis, the first lens has a negative optical focal length, the second lens has a positive optical focal length, the third lens has a positive optical focal length, and the fourth lens has a positive optical focal length; wherein the first lens and the second lens may form a doublet lens. In the present application, a doublet lens is provided in the first lens group of the zoom lens, which is beneficial to balancing the positional chromatic aberration of the first lens group and improving the resolution of the lens; the third lens and the fourth lens with positive optical focal length can share the large aberration pressure under a large field of view, quickly converge the light, and are beneficial to the correction of spherical aberration and chromatic aberration, further improving the resolution of the lens.

[0057] In an exemplary 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. The object side surface of the third lens is convex, and the image side surface is concave. The object side surface of the fourth lens is convex, and the image side surface is concave.

[0058] In an exemplary embodiment, the second lens group of the zoom lens has a negative optical power and can move between the object side and the image side along the optical axis, that is, the second lens group can move 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 can achieve continuous zooming between the wide-angle end and the telephoto end. 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 can perform continuous zooming.

[0059] In an exemplary embodiment, the second lens group may include two negative lenses and one positive lens. Exemplarily, the second lens group may include: 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 fifth lens has a negative optical power; the sixth lens has a negative optical power; and the seventh lens has a positive optical power. In the present application, the second lens group of the zoom lens is provided with two negative lenses, which is conducive to reducing the height difference of light, correcting the field curvature, and improving the resolution of the lens; at the same time, a positive lens is provided, which is conducive to smoothing the divergence of light, ensuring that the aperture remains unchanged during the zoom process, and further improving the resolution of the lens.

[0060] In an exemplary embodiment, the object-side surface of the fifth lens is convex, and the image-side surface is concave. The object-side surface of the sixth lens is concave, and the image-side surface is concave. The object-side surface of the seventh lens is convex, and the image-side surface is concave.

[0061] In an exemplary embodiment, the third lens group of the zoom lens has positive optical power, which is beneficial for correcting aberrations and distortions of the system.

[0062] In an exemplary embodiment, the third lens group may include two doublet lenses and a positive lens. Exemplarily, the third lens group may include: an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens in order from the object side to the image side along the optical axis, wherein the eighth lens has positive focal power, the ninth lens has positive focal power, the tenth lens has negative focal power, the eleventh lens has negative focal power, and the twelfth lens has positive focal power; wherein the ninth lens and the tenth lens form a doublet lens, and the eleventh lens and the twelfth lens form a doublet lens. The third lens group of the zoom lens in the present application can effectively control the trend of light and reduce the height of light by cooperating with the eighth lens and the ninth lens with positive focal power; the doublet lens composed of the ninth lens with positive focal power and the tenth lens with negative focal power is conducive to the mutual compensation of positive and negative spherical aberrations and improves the resolution of the lens; the doublet lens composed of the eleventh lens with negative focal power and the twelfth lens with positive focal power is conducive to controlling the trend of light and making the trend of light rise slowly, which helps to achieve a large target surface.

[0063] In an exemplary embodiment, the object side surface of the eighth lens is convex, and the image side surface is convex. The object side surface of the ninth lens is convex, and the image side surface is convex. The object side surface of the tenth lens is concave, and the image side surface is concave. The object side surface of the eleventh lens is convex, and the image side surface is concave; or the object side surface of the eleventh lens is concave, and the image side surface is convex or concave. The object side surface of the twelfth lens is convex or concave, and the image side surface is convex.

[0064] In an exemplary embodiment, the fourth lens group of the zoom lens has positive optical power and its position along the optical axis is adjustable, that is, the fourth lens group moves between the object side and the image side along the optical axis and moves corresponding to the movement of the second lens group to achieve compensation for changes in the position of the imaging surface during the zooming process, so that the zoom lens has a better imaging position and stable imaging quality during continuous zooming.

[0065] In an exemplary embodiment, the fourth lens group may be composed of a double-cemented lens. Exemplarily, the fourth lens group may include, in order from the object side to the image side along the optical axis: a thirteenth lens and a fourteenth lens, the thirteenth lens has positive or negative focal power, the fourteenth lens has positive or negative focal power; the thirteenth lens and the fourteenth lens form a double-cemented lens. The fourth lens group of the zoom lens in the present application is provided with a double-cemented lens, which is conducive to balancing the off-axis chromatic aberration and aberration of the zoom lens, improving the resolution of the lens, and can also effectively control the light trend, make the light transition smoothly, reduce the tolerance sensitivity of the lens, and improve the production yield.

[0066] In an exemplary embodiment, the fourth lens group may be composed of a doublet lens and a negative lens. Exemplarily, the fourth lens group may include, in order from the object side to the image side along the optical axis: a first auxiliary lens, a thirteenth lens and a fourteenth lens, the first auxiliary lens having a negative optical power, the thirteenth lens having a positive optical power or a negative optical power, and the fourteenth lens having a positive optical power or a negative optical power; wherein the thirteenth lens and the fourteenth lens form a doublet lens. The fourth lens group of the zoom lens in the present application is provided with a doublet lens, which is beneficial to balancing the off-axis chromatic aberration and aberration of the zoom lens, improving the resolution of the lens, and can also effectively control the light trend, make the light transition smoothly, reduce the tolerance sensitivity of the lens, and improve the production yield; at the same time, the first auxiliary lens is located on the object side of the thirteenth lens, which can effectively compress the light height and reduce the tolerance sensitivity of the lens.

[0067] In an exemplary embodiment, the object side surface of the first auxiliary lens is convex, and the image side surface is concave. The object side surface of the thirteenth lens is convex, and the image side surface is convex or concave. The object side surface of the fourteenth lens is concave, and the image side surface is convex or concave; or, the object side surface of the fourteenth lens is convex, and the image side surface is convex.

[0068] In an exemplary embodiment, the fifth lens group of the zoom lens has positive or negative optical power, which is beneficial to reducing CRA and making the light diverge smoothly, and is also beneficial to raising the light and achieving a large target surface.

[0069] In an exemplary embodiment, the fifth lens group may be composed of a negative lens and a positive lens. Exemplarily, the fifth lens group may include, in order from the object side to the image side along the optical axis: a fifteenth lens and a sixteenth lens, the fifteenth lens having negative optical power, and the sixteenth lens having positive optical power.

[0070] In an exemplary embodiment, the fifth lens group may be composed of a doublet lens and a positive lens. Exemplarily, the fifth lens group may include, in order from the object side to the image side along the optical axis: a fifteenth lens, a second auxiliary lens and a sixteenth lens, the fifteenth lens having a negative optical power, the second auxiliary lens having a positive optical power, and the sixteenth lens having a positive optical power; wherein the fifteenth lens and the second auxiliary lens form a doublet lens. The fifth lens group of the zoom lens in the present application can effectively correct residual chromatic aberration and field curvature by setting a doublet lens, while enhancing light, increasing image height, and realizing a large target surface.

[0071] In an exemplary embodiment, the object side surface of the fifteenth lens is concave, and the image side surface is convex or concave or flat. The object side surface of the second auxiliary lens is convex or flat, and the image side surface is convex. The object side surface of the sixteenth lens is convex or concave, and the image side surface is convex.

[0072] The sixteenth lens in the present application is a positive lens with a convex image side surface, which is beneficial to the smooth transition of light while lifting the light, reducing CRA, and helping the light to better match the chip size and achieve a large target surface; at the same time, it can further correct field curvature and improve the resolution of the lens.

[0073] In an exemplary embodiment, the zoom lens of the present application further includes an aperture, which is disposed between the second lens group and the third lens group. Exemplarily, the aperture may be disposed between the seventh lens and the eighth lens. It should be noted that in alternative embodiments, the aperture may also be disposed at other positions according to actual needs, and this is not specifically limited.

[0074] In an exemplary embodiment, the zoom lens satisfies: 2.1≤FG1 / Fw≤3.1, 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. By reasonably controlling the ratio of the effective focal length of the first lens group to the total effective focal length of the zoom lens at the wide-angle end, it is beneficial to converge large-angle incident light into the optical system, effectively expand the field of view of the optical system, and make the field of view of the zoom lens at the wide-angle end greater than or equal to 68°. Exemplarily, the zoom lens may also satisfy: 2.2≤FG1 / Fw≤2.95, which may be more beneficial to converge large-angle incident light into the optical system, effectively expanding the field of view of the optical system.

[0075] In an exemplary embodiment, the zoom lens satisfies: -1≤FG2 / Fw≤-0.5, 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. By reasonably controlling the ratio of the effective focal length of the second lens group to the total effective focal length of the zoom lens at the wide-angle end, the imaging performance is improved while ensuring the required zoom ratio during the zooming process. Exemplarily, the zoom lens may also satisfy: -1≤FG2 / Fw≤-0.55, which may be more conducive to improving the imaging performance while ensuring the required zoom ratio during the zooming process.

[0076] In an exemplary embodiment, the zoom lens satisfies: 0.9≤FG3 / Fw≤1.7, 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. By reasonably allocating the effective focal length of the third lens group, it is beneficial for the third lens group to collect the emitted light of the second lens group, so that the light transitions smoothly, effectively reduces the generation of aberrations, and improves the optical imaging quality. Exemplarily, the zoom lens may also satisfy: 0.95≤FG3 / Fw≤1.58, which may be more beneficial for the third lens group to collect the emitted light of the second lens group, so that the light transitions smoothly, further reduces the generation of aberrations, and improves the optical imaging quality.

[0077] In an exemplary embodiment, the zoom lens satisfies: 1≤FG4 / Fw≤3, where FG4 is the effective focal length of the fourth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By reasonably controlling the effective focal length of the fourth lens group, while ensuring the focus clarity of the object distance at far and near and different focal length segments, the changes in spherical aberration and distortion during the entire zooming process can also be reduced to obtain higher imaging performance. Exemplarily, the zoom lens can also satisfy: 1.25≤FG4 / Fw≤2.7, while ensuring the focus clarity of the object distance at far and near and different focal length segments, it can be more conducive to reducing the changes in spherical aberration and distortion during the entire zooming process, and further conducive to obtaining higher imaging performance.

[0078] In an exemplary embodiment, the zoom lens satisfies: 3≤|FG5 / Fw|≤13, 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. By properly controlling the effective focal length of the fifth lens group, it is beneficial to ensure that a large target surface effect is achieved during the entire zooming process to obtain higher imaging performance. Exemplarily, the zoom lens may also satisfy: 3.3≤|FG5 / Fw|≤12.6, which may be more beneficial to ensure that a large target surface effect is achieved during the entire zooming process, and further to obtain higher imaging performance.

[0079] In an exemplary embodiment, the zoom lens satisfies: 2≤Ft / Fw≤3.5, where Ft is the total effective focal length of the zoom lens at the telephoto end, and Fw is the total effective focal length of the zoom lens at the wide-angle end. By properly controlling the total effective focal length of the zoom lens at the telephoto end and the total effective focal length of the zoom lens at the wide-angle end, the lens can achieve a zoom ratio of more than 2.18X. Exemplarily, the zoom lens can also satisfy: 2≤Ft / Fw≤3.2, which can be more conducive to achieving a zoom ratio of more than 2.18X for the lens.

[0080] In an exemplary embodiment, the zoom lens satisfies: 0.4≤Ft / TTL≤0.8, where Ft is the total effective focal length of the zoom lens 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. By controlling the above conditions, the length of the zoom lens can be effectively limited, which is conducive to miniaturization of the zoom lens. Exemplarily, the zoom lens can also satisfy: 0.4≤Ft / TTL≤0.7.

[0081] In an exemplary embodiment, the zoom lens satisfies: 0.15≤Fw / TTL≤0.4, where Fw is the total effective focal length of the zoom lens 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. By controlling the above conditions, the length of the zoom lens can be effectively limited, which is conducive to miniaturization of the zoom lens. Exemplarily, the zoom lens can also satisfy: 0.15≤Fw / TTL≤0.25, which can more effectively limit the length of the zoom lens and achieve miniaturization of the zoom lens.

[0082] In an exemplary embodiment, the zoom lens satisfies: 5.75≤TTL / d2≤8, wherein TTL is the on-axis distance from the object side of the first lens to the imaging surface of the zoom lens, and d2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end. By controlling the above conditions, the zoom lens of the present application has a faster zoom speed and improved zoom efficiency. Exemplarily, the zoom lens can also satisfy: 6≤TTL / d2≤7.8, which can be more conducive to making the zoom lens of the present application have a faster zoom speed and improved zoom efficiency.

[0083] In an exemplary embodiment, the zoom lens satisfies: 0.3≤100*d4 / TTL≤3.5, wherein TTL is the on-axis distance from the object side of the first lens to the imaging surface of the zoom lens, and d4 is the on-axis distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end. By controlling the above conditions, the zoom lens of the present application has a faster focusing speed, so that the lens can focus quickly during the zooming process, and the clarity of the imaging picture is guaranteed. Exemplarily, the zoom lens can also satisfy: 0.3≤100*d4 / TTL≤3.2, which can be more conducive to the zoom lens of the present application having a faster focusing speed, so that the lens can focus quickly during the zooming process, and further conducive to ensuring the clarity of the imaging picture.

[0084] In an exemplary embodiment, the zoom lens satisfies: 3.5≤ΦG1 / H≤5.6, where ΦG1 is the maximum full aperture of the lens in the first lens group, and H is the full image height of the zoom lens. Under the requirement of meeting the large target surface, by reasonably constraining the maximum full aperture of the lens in the first lens group, it is helpful to achieve miniaturization of the lens on the basis of meeting the large target surface. Exemplarily, the zoom lens can also meet: 3.75≤ΦG1 / H≤5.35, which can be more conducive to achieving miniaturization of the lens on the basis of meeting the large target surface.

[0085] In an exemplary embodiment, the zoom lens satisfies: -3.9≤f7 / FG2≤-1.9, where f7 is the effective focal length of the seventh lens and FG2 is the effective focal length of the second lens group. By controlling the above conditions, the seventh lens has a short focal length for converging light, thereby ensuring the light throughput of the lens. Exemplarily, the zoom lens may also satisfy: -3.7≤f7 / FG2≤-2.2, which may be more conducive to making the seventh lens have a short focal length for converging light, further conducive to ensuring the light throughput of the lens.

[0086] In an exemplary embodiment, the zoom lens satisfies: 0<|f16 / FG5|≤3.3, wherein f16 is the effective focal length of the sixteenth lens, and FG5 is the effective focal length of the fifth lens group. By controlling the above conditions, it is beneficial to make the light diverge smoothly, and at the same time, it is beneficial to raise the light to achieve a large target surface. Exemplarily, the zoom lens can also satisfy: 0<|f16 / FG5|≤0.55, which can be more beneficial to make the light diverge smoothly, and further to raise the light to achieve a large target surface.

[0087] In an exemplary embodiment, the zoom lens satisfies: 0<1-2Ft*tan(FOV_t / 2) / H≤0.045, where Ft is the total effective focal length of the zoom lens when it is at the telephoto end, and FOV_t is the full field of view angle when the zoom lens is at the telephoto end. By controlling the relationship between the total effective focal length and the full field of view angle when the zoom lens is at the telephoto end, the ratio of the actual image height to the theoretical image height can be controlled within a suitable range, which is conducive to achieving low distortion. Exemplarily, the zoom lens may also satisfy: 0<1-2Ft*tan(FOV_t / 2) / H≤0.04.

[0088] In an exemplary embodiment, the zoom lens satisfies: 4.3≤TTL / H≤5, wherein TTL is the on-axis distance from the object side of the first lens to the imaging surface of the zoom lens, and H is the full image height of the zoom lens. By controlling the above conditions, it is beneficial to improve the resolution of the lens while reducing costs. It should be noted that when TTL / H is less than the lower limit of the above-mentioned limited range, the aberration balance of the zoom lens at the telephoto end is limited, and it is difficult to improve the resolution of the lens; when TTL / H is greater than the upper limit of the above-mentioned limited range, the volume of the zoom lens increases, the zoom efficiency is low, and the cost increases. Exemplarily, the zoom lens can also satisfy: 4.4≤TTL / H≤4.7, which can be more conducive to improving the resolution of the lens.

[0089] In an exemplary embodiment, the full image height H of the zoom lens of the present application may satisfy: 15 mm ≤ H ≤ 18 mm, and more specifically, H may satisfy 15.98 mm ≤ H ≤ 17.47 mm.

[0090] In an exemplary embodiment, the aperture number Fno of the zoom lens of the present application is constant, for example, Fno is 6.0 or 7.0.

[0091] In an exemplary embodiment, the optical distortion DIS of the zoom lens of the present application at the wide-angle end satisfies: -0.5%≤DIS≤-0.28%, and the optical distortion DIS of the zoom lens at the telephoto end satisfies: 0.1%≤DIS≤0.48%, and has the characteristic of low distortion.

[0092] In an exemplary embodiment, the zoom lens of the present application has a wide object distance range, for example, from 0.15 mm to infinity.

[0093] In an exemplary embodiment, the present application uses a combination of spherical lenses and aspherical lenses, which is conducive to reducing the difficulty of lens processing; at the same time, through the combination of materials, a heat-free design can be achieved. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased, and even all lenses use aspherical lenses. The 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 aberrations and improving astigmatism aberrations. 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. Exemplarily, the seventh lens is a meniscus-shaped aspherical mirror surface, which is conducive to correcting field curvature and distortion at different focal lengths, achieving low distortion of the lens, and effectively improving the resolution of the lens.

[0094] The zoom lens of the present application can adopt a lens structure made of all glass materials. The zoom lens made of glass can suppress the deviation of the back focus of the zoom lens due to temperature changes, so as to improve the stability of the system; at the same time, the use of glass material can avoid the occurrence of lens imaging blur due to high and low temperature changes in the use environment, ensuring the normal use of the lens, and is conducive to the lens to achieve athermalization, and can also better correct the system chromatic aberration and improve the resolution of the lens. The temperature range of the zoom lens designed with all glass materials in the present application is relatively wide, and stable optical performance can be maintained in the range of -40℃ to 85℃.

[0095] The zoom lens of 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 focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, and a fifth lens group with positive focal power or negative focal power, and also includes an aperture 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 17.77 mm).

[0096] The zoom lens of the present application has excellent resolution, with a resolution of over 8K.

[0097] 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.

[0098] 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 sixteen lenses or eighteen lenses are described as examples in the embodiments, the zoom lens is not limited to including sixteen lenses or eighteen lenses. If necessary, the zoom lens may also include other numbers of lenses.

[0099] Specific embodiments of the zoom lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0100] Example 1

[0101] The following reference Figures 1 to 4 A zoom lens according to Embodiment 1 of the present application is described. Figure 1 is a schematic structural diagram of the zoom lens of Example 1 of the present application when it is at the wide-angle end, Figure 2 It is a schematic structural diagram of the zoom lens of Example 1 of the present application when it is at the telephoto end.

[0102] like Figure 1 and Figure 2 As shown, the zoom lens includes, from the object side to the image side along the optical axis, a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a third lens group G3 with positive focal power, a fourth lens group G4 with positive focal power, a fifth lens group G5 with negative focal power, and an imaging surface IMA. Among them, the first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, which can be fixed relative to the position of the imaging surface IMA of the zoom lens; the second lens group G2 is a zoom group, and the fourth lens group G4 is a compensation group. The second lens group G2 and the fourth lens group G4 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.

[0103] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in order from the object side to the image side along the optical axis. The first lens L1 has negative optical power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive optical power, and its object side surface S2 is convex, and its image side surface S3 is concave. The third lens L3 has positive optical power, and its object side surface S4 is convex, and its image side surface S5 is concave. The fourth lens L4 has positive optical power, and its object side surface S6 is convex, and its image side surface S7 is concave. Among them, the first lens L1 and the second lens L2 are glued to form a double glued lens.

[0104] The second lens group G2 includes a fifth lens L5, a sixth lens L6 and a seventh lens L7 in order from the object side to the image side along the optical axis. The fifth lens L5 has negative optical power, and its object side surface S8 is convex, and its image side surface S9 is concave. The sixth lens L6 has negative optical power, and its object side surface S10 is concave, and its image side surface S11 is concave. The seventh lens L7 has positive optical power, and its object side surface S12 is convex, and its image side surface S13 is concave.

[0105] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 in order from the object side to the image side along the optical axis. The eighth lens L8 has positive power, and its object side surface S15 is convex, and its image side surface S16 is convex. The ninth lens L9 has positive power, and its object side surface S17 is convex, and its image side surface S18 is convex. The tenth lens L10 has negative power, and its object side surface S18 is concave, and its image side surface S19 is concave. The eleventh lens L11 has negative power, and its object side surface S20 is concave, and its image side surface S21 is concave. The twelfth lens L12 has positive power, and its object side surface S21 is convex, and its image side surface S22 is convex. Among them, the ninth lens L9 and the tenth lens L10 are cemented to form a double cemented lens, and the eleventh lens L11 and the twelfth lens L12 are cemented to form a double cemented lens.

[0106] The fourth lens group G4 includes a first auxiliary lens L41, a thirteenth lens L13 and a fourteenth lens L14 in order from the object side to the image side along the optical axis. The first auxiliary lens L41 has negative optical power, and its object side surface S23 is convex, and its image side surface S24 is concave. The thirteenth lens L13 has positive optical power, and its object side surface S25 is convex, and its image side surface S26 is convex. The fourteenth lens L14 has negative optical power, and its object side surface S26 is concave, and its image side surface S27 is convex. Among them, the thirteenth lens L13 and the fourteenth lens L14 are cemented to form a double cemented lens.

[0107] The fifth lens group G5 includes a fifteenth lens L15, a second auxiliary lens L52 and a sixteenth lens L16 in order from the object side to the image side along the optical axis. The fifteenth lens L15 has negative optical power, and its object side surface S28 is concave, and its image side surface S29 is concave. The second auxiliary lens L52 has positive optical power, and its object side surface S29 is convex, and its image side surface S30 is convex. The sixteenth lens L16 has positive optical power, and its object side surface S31 is convex, and its image side surface S32 is convex. Among them, the fifteenth lens L15 and the second auxiliary lens L52 are cemented to form a double cemented lens.

[0108] The zoom lens may further include an aperture STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S33 and a second side surface S34 and / or a protective glass (not shown) having a first side surface and a second side surface. Light from an object passes through each surface S1 to S34 in sequence and is finally imaged on the imaging surface IMA. It should be noted that surfaces S1 to S34 are Figure 1 and Figure 2 Not shown in FIG.

[0109] Table 1 shows basic parameters of the zoom lens of Example 1, wherein the units of the curvature radius and thickness / distance are both millimeters (mm).

[0110] Table 1

[0111]

[0112]

[0113] 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 zoom lens can achieve clear focus on the imaging surface during the zooming process.

[0114] The constant aperture Fno of the zoom lens in Example 1 is 6.0. Table 2 shows the values ​​of T0, T1, T2 and T3 in Table 1 when the zoom lens is at the wide-angle end, the mid-focus end and the telephoto end, respectively. It can be understood that the mid-focus end is the state when the zoom lens is between the wide-angle end and the telephoto end. Table 2 also shows the values ​​of the total effective focal length F, optical distortion value DIS, full field of view FOV, full image height H and the axial distance TTL from the object side of the first lens to the imaging surface of the zoom lens when the zoom lens of Example 1 is at the wide-angle end and the telephoto end, respectively, wherein F, DIS and FOV change as the zoom lens switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and H and TTL remain unchanged. The units of F, H, TTL, T0, T1, T2 and T3 in Table 2 are all millimeters (mm), the unit of FOV is degree (°), and the unit of DIS is %.

[0115] Table 2

[0116] Wide-angle end Mid-focus Telephoto end F 16.08(Fw) 35.05(Ft) DIS -0.33 0.48 FOV 54.683 26.092 H 16.78 16.78 TTL 74 74 T0 2.434 6.879 14.739 T1 14.605 10.160 2.300 T2 4.512 4.094 4.270 T3 4.507 4.925 4.749

[0117] It should be noted that in Example 1, the object-side surface and the image-side surface of each lens are both spherical surfaces.

[0118] Figure 3 and Figure 4 The following are distortion diagrams of the zoom lens of Example 1 of the present application when it is at the wide-angle end and the telephoto end. Figure 3 and Figure 4 It can be seen that the zoom lens provided in Example 1 can achieve good imaging quality at different focal lengths.

[0119] Example 2

[0120] The following reference Figures 5 to 8 The zoom lens according to Embodiment 2 of the present application is described. Figure 5 is a schematic structural diagram of the zoom lens of Example 2 of the present application when it is at the wide-angle end, Figure 6 It is a schematic diagram of the structure of the zoom lens of Example 2 of the present application when it is at the telephoto end.

[0121] like Figure 5 and Figure 6 As shown, the zoom lens includes, from the object side to the image side along the optical axis, a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a third lens group G3 with positive focal power, a fourth lens group G4 with positive focal power, a fifth lens group G5 with positive focal power, and an imaging surface IMA. Among them, the first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, which can be fixed relative to the position of the imaging surface IMA of the zoom lens; the second lens group G2 is a zoom group, and the fourth lens group G4 is a compensation group. The second lens group G2 and the fourth lens group G4 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.

[0122] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in order from the object side to the image side along the optical axis. The first lens L1 has negative optical power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive optical power, and its object side surface S2 is convex, and its image side surface S3 is a plane. The third lens L3 has positive optical power, and its object side surface S4 is convex, and its image side surface S5 is concave. The fourth lens L4 has positive optical power, and its object side surface S6 is convex, and its image side surface S7 is concave. Among them, the first lens L1 and the second lens L2 are glued together to form a double glued lens.

[0123] The second lens group G2 includes a fifth lens L5, a sixth lens L6 and a seventh lens L7 in order from the object side to the image side along the optical axis. The fifth lens L5 has negative optical power, and its object side surface S8 is convex, and its image side surface S9 is concave. The sixth lens L6 has negative optical power, and its object side surface S10 is concave, and its image side surface S11 is concave. The seventh lens L7 has positive optical power, and its object side surface S12 is convex, and its image side surface S13 is concave.

[0124] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 in order from the object side to the image side along the optical axis. The eighth lens L8 has positive power, and its object side surface S15 is convex, and its image side surface S16 is convex. The ninth lens L9 has positive power, and its object side surface S17 is convex, and its image side surface S18 is convex. The tenth lens L10 has negative power, and its object side surface S18 is concave, and its image side surface S19 is concave. The eleventh lens L11 has negative power, and its object side surface S20 is convex, and its image side surface S21 is concave. The twelfth lens L12 has positive power, and its object side surface S21 is convex, and its image side surface S22 is convex. Among them, the ninth lens L9 and the tenth lens L10 are cemented to form a double cemented lens, and the eleventh lens L11 and the twelfth lens L12 are cemented to form a double cemented lens.

[0125] The fourth lens group G4 includes a first auxiliary lens L41, a thirteenth lens L13 and a fourteenth lens L14 in order from the object side to the image side along the optical axis. The first auxiliary lens L41 has negative optical power, and its object side surface S23 is convex, and its image side surface S24 is concave. The thirteenth lens L13 has positive optical power, and its object side surface S25 is convex, and its image side surface S26 is convex. The fourteenth lens L14 has negative optical power, and its object side surface S26 is concave, and its image side surface S27 is concave. Among them, the thirteenth lens L13 and the fourteenth lens L14 are cemented to form a double cemented lens.

[0126] The fifth lens group G5 includes a fifteenth lens L15, a second auxiliary lens L52 and a sixteenth lens L16 in order from the object side to the image side along the optical axis. The fifteenth lens L15 has negative optical power, and its object side surface S28 is concave, and its image side surface S29 is concave. The second auxiliary lens L52 has positive optical power, and its object side surface S29 is convex, and its image side surface S30 is convex. The sixteenth lens L16 has positive optical power, and its object side surface S31 is concave, and its image side surface S32 is convex. Among them, the fifteenth lens L15 and the second auxiliary lens L52 are cemented to form a double cemented lens.

[0127] The zoom lens may further include an aperture STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S33 and a second side surface S34 and / or a protective glass (not shown) having a first side surface and a second side surface. Light from an object passes through each surface S1 to S34 in sequence and is finally imaged on the imaging surface IMA. It should be noted that surfaces S1 to S34 are Figure 5 and Figure 6 Not shown in FIG.

[0128] Table 3 shows basic parameters of the zoom lens of Example 2, wherein the units of the curvature radius and thickness / distance are both millimeters (mm).

[0129] Table 3

[0130]

[0131] The constant aperture Fno of the zoom lens in Example 2 is 6.0. Table 4 shows the values ​​of T0, T1, T2 and T3 in Table 3 when the zoom lens is at the wide-angle end, the mid-focus end and the telephoto end, respectively. It can be understood that the mid-focus end is the state when the zoom lens is between the wide-angle end and the telephoto end. Table 4 also shows the values ​​of the total effective focal length F, optical distortion value DIS, full field of view FOV, full image height H and the axial distance TTL from the object side of the first lens to the imaging surface of the zoom lens when the zoom lens of Example 2 is at the wide-angle end and the telephoto end, respectively, wherein F, DIS and FOV change as the zoom lens switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and H and TTL remain unchanged. The units of F, H, TTL, T0, T1, T2 and T3 in Table 4 are all millimeters (mm), the unit of FOV is degree (°), and the unit of DIS is %.

[0132] Table 4

[0133] Wide angle Mid-focus Telephoto end F 16(Fw) 50(Ft) DIS -0.5 0.14 FOV 52.77 17.47 H 15.976 15.976 TTL 74 74 T0 1.781 8.405 13.264 T1 13.685 7.061 2.202 T2 5.882 2.799 3.526 T3 4.855 7.938 7.211

[0134] In Example 2, both the object-side surface S12 and the image-side surface S13 of the seventh lens L7 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0135]

[0136] Wherein, x is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 3 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 5 below gives the cone coefficient k and the high-order coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each aspherical mirror surface in Example 2.

[0137] Table 5

[0138] Face number k A4 A6 A8 A10 A12 A14 A16 S12 -0.556 9.71E-06 -7.37E-06 4.48E-08 8.93E-10 -1.88E-10 -5.39E-13 9.74E-14 S13 -0.110 -1.83E-06 -1.16E-05 4.30E-07 -1.61E-08 -1.70E-11 8.42E-12 -7.64E-14

[0139] Figure 7 and Figure 8 The following are distortion diagrams of the zoom lens of Example 2 of the present application when it is at the wide-angle end and the telephoto end. Figure 7 and Figure 8It can be seen that the zoom lens provided in Example 2 can achieve good imaging quality at different focal lengths.

[0140] Example 3

[0141] The following reference Figures 9 to 12 The zoom lens according to Embodiment 3 of the present application is described. Fig. 9 is a schematic structural diagram of the zoom lens of Example 3 of the present application when it is at the wide-angle end, Fig.10 It is a schematic diagram of the structure of the zoom lens of Example 3 of the present application when it is at the telephoto end.

[0142] like Fig. 9 and Fig.10 As shown, the zoom lens includes, from the object side to the image side along the optical axis, a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a third lens group G3 with positive focal power, a fourth lens group G4 with positive focal power, a fifth lens group G5 with positive focal power, and an imaging surface IMA. Among them, the first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, which can be fixed relative to the position of the imaging surface IMA of the zoom lens; the second lens group G2 is a zoom group, and the fourth lens group G4 is a compensation group. The second lens group G2 and the fourth lens group G4 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.

[0143] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in order from the object side to the image side along the optical axis. The first lens L1 has negative optical power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive optical power, and its object side surface S2 is convex, and its image side surface S3 is concave. The third lens L3 has positive optical power, and its object side surface S4 is convex, and its image side surface S5 is concave. The fourth lens L4 has positive optical power, and its object side surface S6 is convex, and its image side surface S7 is concave. Among them, the first lens L1 and the second lens L2 are glued to form a double glued lens.

[0144] The second lens group G2 includes a fifth lens L5, a sixth lens L6 and a seventh lens L7 in order from the object side to the image side along the optical axis. The fifth lens L5 has negative optical power, and its object side surface S8 is convex, and its image side surface S9 is concave. The sixth lens L6 has negative optical power, and its object side surface S10 is concave, and its image side surface S11 is concave. The seventh lens L7 has positive optical power, and its object side surface S12 is convex, and its image side surface S13 is concave.

[0145] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 in order from the object side to the image side along the optical axis. The eighth lens L8 has positive power, and its object side surface S15 is convex, and its image side surface S16 is convex. The ninth lens L9 has positive power, and its object side surface S17 is convex, and its image side surface S18 is convex. The tenth lens L10 has negative power, and its object side surface S18 is concave, and its image side surface S19 is concave. The eleventh lens L11 has negative power, and its object side surface S20 is concave, and its image side surface S21 is convex. The twelfth lens L12 has positive power, and its object side surface S21 is concave, and its image side surface S22 is convex. Among them, the ninth lens L9 and the tenth lens L10 are cemented to form a double cemented lens, and the eleventh lens L11 and the twelfth lens L12 are cemented to form a double cemented lens.

[0146] The fourth lens group G4 includes a first auxiliary lens L41, a thirteenth lens L13 and a fourteenth lens L14 in order from the object side to the image side along the optical axis. The first auxiliary lens L41 has negative optical power, and its object side surface S23 is convex, and its image side surface S24 is concave. The thirteenth lens L13 has positive optical power, and its object side surface S25 is convex, and its image side surface S26 is convex. The fourteenth lens L14 has positive optical power, and its object side surface S26 is concave, and its image side surface S27 is convex. Among them, the thirteenth lens L13 and the fourteenth lens L14 are cemented to form a double cemented lens.

[0147] The fifth lens group G5 includes a fifteenth lens L15, a second auxiliary lens L52 and a sixteenth lens L16 in order from the object side to the image side along the optical axis. The fifteenth lens L15 has negative optical power, and its object side surface S28 is concave, and its image side surface S29 is concave. The second auxiliary lens L52 has positive optical power, and its object side surface S29 is convex, and its image side surface S30 is convex. The sixteenth lens L16 has positive optical power, and its object side surface S31 is convex, and its image side surface S32 is convex. Among them, the fifteenth lens L15 and the second auxiliary lens L52 are cemented to form a double cemented lens.

[0148] The zoom lens may further include an aperture STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S33 and a second side surface S34 and / or a protective glass (not shown) having a first side surface and a second side surface. Light from an object passes through each surface S1 to S34 in sequence and is finally imaged on the imaging surface IMA. It should be noted that surfaces S1 to S34 are Fig. 9 and Fig.10 Not shown in FIG.

[0149] Table 6 shows basic parameter tables of the zoom lens of Example 3, wherein the units of the curvature radius and thickness / distance are both millimeters (mm).

[0150] Table 6

[0151]

[0152] The constant aperture Fno of the zoom lens in Example 3 is 6.0. Table 7 shows the values ​​of T0, T1, T2 and T3 in Table 6 when the zoom lens is at the wide-angle end, the mid-focus end and the telephoto end, respectively. It can be understood that the mid-focus end is the state when the zoom lens is between the wide-angle end and the telephoto end. Table 7 also shows the values ​​of the total effective focal length F, optical distortion value DIS, full field of view FOV, full image height H and the axial distance TTL from the object side of the first lens to the imaging surface of the zoom lens when the zoom lens of Example 3 is at the wide-angle end and the telephoto end, respectively, where F, DIS and FOV change as the zoom lens switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and H and TTL remain unchanged. The units of F, H, TTL, T0, T1, T2 and T3 in Table 7 are all millimeters (mm), the unit of FOV is degree (°), and the unit of DIS is %.

[0153] Table 7

[0154] Wide-angle end Mid-focus Telephoto end F 15.78(Fw) 34.56(Ft) DIS -0.49 0.44 FOV 55.69 26.8 H 16.78 16.78 TTL 74 74 T0 2.279 5.943 12.328 T1 12.395 8.731 2.346 T2 6.471 5.629 5.639 T3 3.389 4.231 4.221

[0155] In Example 3, the object-side surface S12 and the image-side surface S13 of the seventh lens L7 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by, but not limited to, the formula (1) given in the above Example 2. The following Table 8 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, and A12 of each aspherical mirror surface that can be used in Example 3.

[0156] Table 8

[0157] Face number k A4 A6 A8 A10 A12 S12 -0.031 -1.61E-05 -2.72E-06 -4.93E-08 2.97E-10 -1.99E-12 S13 3.828 -1.03E-04 -4.76E-06 -6.12E-08 1.02E-09 -1.53E-11

[0158] Fig.11 and Fig.12 The following are distortion diagrams of the zoom lens of Example 3 of the present application when it is at the wide-angle end and the telephoto end. Fig.11 and Fig.12 It can be seen that the zoom lens provided in Example 3 can achieve good imaging quality at different focal lengths.

[0159] Example 4

[0160] The following reference Figures 13 to 16 The zoom lens according to Embodiment 4 of the present application is described. Fig.13 is a schematic structural diagram of the zoom lens of Example 4 of the present application when it is at the wide-angle end, Fig.13It is a schematic diagram of the structure of the zoom lens of Example 4 of the present application when it is at the telephoto end.

[0161] like Fig.13 and Fig.14 As shown, the zoom lens includes, from the object side to the image side along the optical axis, a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, a third lens group G3 with positive focal power, a fourth lens group G4 with positive focal power, a fifth lens group G5 with negative focal power, and an imaging surface IMA. Among them, the first lens group G1, the third lens group G3, and the fifth lens group G5 are fixed groups, which can be fixed relative to the position of the imaging surface IMA of the zoom lens; the second lens group G2 is a zoom group, and the fourth lens group G4 is a compensation group. The second lens group G2 and the fourth lens group G4 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.

[0162] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in order from the object side to the image side along the optical axis. The first lens L1 has negative optical power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens L2 has positive optical power, and its object side surface S2 is convex, and its image side surface S3 is convex. The third lens L3 has positive optical power, and its object side surface S4 is convex, and its image side surface S5 is concave. The fourth lens L4 has positive optical power, and its object side surface S6 is convex, and its image side surface S7 is concave. Among them, the first lens L1 and the second lens L2 are glued to form a double glued lens.

[0163] The second lens group G2 includes a fifth lens L5, a sixth lens L6 and a seventh lens L7 in order from the object side to the image side along the optical axis. The fifth lens L5 has negative optical power, and its object side surface S8 is convex, and its image side surface S9 is concave. The sixth lens L6 has negative optical power, and its object side surface S10 is concave, and its image side surface S11 is concave. The seventh lens L7 has positive optical power, and its object side surface S12 is convex, and its image side surface S13 is concave.

[0164] The third lens group G3 includes an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11 and a twelfth lens L12 in order from the object side to the image side along the optical axis. The eighth lens L8 has positive power, and its object side surface S15 is convex, and its image side surface S16 is convex. The ninth lens L9 has positive power, and its object side surface S17 is convex, and its image side surface S18 is convex. The tenth lens L10 has negative power, and its object side surface S18 is concave, and its image side surface S19 is concave. The eleventh lens L11 has negative power, and its object side surface S20 is concave, and its image side surface S21 is convex. The twelfth lens L12 has positive power, and its object side surface S21 is concave, and its image side surface S22 is convex. Among them, the ninth lens L9 and the tenth lens L10 are cemented to form a double cemented lens, and the eleventh lens L11 and the twelfth lens L12 are cemented to form a double cemented lens.

[0165] The fourth lens group G4 includes a thirteenth lens L13 and a fourteenth lens L14 in order from the object side to the image side along the optical axis. The thirteenth lens L13 has negative optical power, and its object side surface S23 is convex, and its image side surface S24 is concave. The fourteenth lens L14 has positive optical power, and its object side surface S24 is convex, and its image side surface S25 is convex. The thirteenth lens L13 and the fourteenth lens L14 are cemented to form a double cemented lens.

[0166] The fifth lens group G5 includes a fifteenth lens L15 and a sixteenth lens L16 in order from the object side to the image side along the optical axis. The fifteenth lens L15 has negative refractive power, its object side surface S26 is concave, and its image side surface S27 is convex. The sixteenth lens L16 has positive refractive power, its object side surface S28 is convex, and its image side surface S29 is convex.

[0167] The zoom lens may further include an aperture STO (surface S14) disposed between the second lens group G2 and the third lens group G3. More specifically, the aperture STO may be disposed between the seventh lens L7 and the eighth lens L8. Optionally, the zoom lens may further include a filter having a first side surface S30 and a second side surface S31 and / or a protective glass having a first side surface and a second side surface (not shown). Light from an object passes through each surface S1 to S31 in sequence and is finally imaged on the imaging surface IMA. It should be noted that the surfaces S1 to S31 are Fig.13 and Fig.14 Not shown in FIG.

[0168] Table 9 shows basic parameter tables of the zoom lens of Example 4, wherein the units of the curvature radius and thickness / distance are both millimeters (mm).

[0169] Table 9

[0170]

[0171]

[0172] The constant aperture Fno of the zoom lens in Example 4 is 6.0. Table 10 shows the values ​​of T0, T1, T2 and T3 in Table 9 when the zoom lens is at the wide-angle end, the mid-focus end and the telephoto end, respectively. It can be understood that the mid-focus end is the state when the zoom lens is between the wide-angle end and the telephoto end. Table 10 also shows the values ​​of the total effective focal length F, optical distortion value DIS, full field of view FOV, full image height H and the axial distance TTL from the object side of the first lens to the imaging surface of the zoom lens when the zoom lens of Example 4 is at the wide-angle end and the telephoto end, respectively, wherein F, DIS and FOV change as the zoom lens switches from the wide-angle end to the telephoto end or from the telephoto end to the wide-angle end, and H and TTL remain unchanged. The units of F, H, TTL, T0, T1, T2 and T3 in Table 10 are all millimeters (mm), the unit of FOV is degree (°), and the unit of DIS is %.

[0173] Table 10

[0174]

[0175]

[0176] In Example 4, the object-side surface S12 and the image-side surface S13 of the seventh lens L7 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by, but not limited to, the formula (1) given in the above Example 2. The following Table 11 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A10, and A12 of each aspherical mirror surface that can be used in Example 4.

[0177] Table 11

[0178] Face number k A4 A6 A8 A10 A12 S12 -1.001 7.14E-05 -1.05E-06 -6.21E-09 -2.05E-09 8.47E-12 S13 -20.000 1.41E-04 -2.35E-06 -1.53E-08 -2.23E-09 2.22E-11

[0179] Fig.15 and Fig.16 The following are distortion diagrams of the zoom lens of Example 4 of the present application when it is at the wide-angle end and the telephoto end. Fig.15 and Fig.16 It can be seen that the zoom lens provided in Example 4 can achieve good imaging quality at different focal lengths.

[0180] Table 12 lists the values ​​of the parameters of the zoom lens in each of Examples 1 to 4. The unit of FOV_t is degree (°), and the units of other parameters are all millimeters (mm).

[0181] Table 12

[0182] Parameters / Examples 1 2 3 4 FG1 46.858 35.973 40.232 38.249 FG2 -15.437 -9.416 -12.394 -11.509 FG3 18.584 16.389 17.506 24.505 FG4 25.370 42.638 37.289 20.992 FG5 -80.106 82.057 197.731 -53.887 f7 34.268 28.329 45.274 27.958 f16 -9.414 -10.590 -10.590 -26.825 f18 16.068 19.058 20.311 60.000 d2 12.305 11.484 10.049 10.143 d4 0.242 2.356 0.832 1.700 ΦG1 89.328 82.486 86.234 63.8978 FWf 16.080 16.000 15.780 16.000 Ft 35.050 50.000 34.560 35.000 TTL 74.000 74.000 74.000 77.700 H 16.780 15.976 16.780 17.470 FOV_t 26.092 17.468 26.787 27.240

[0183] In summary, the zoom lenses in Examples 1 to 4 respectively satisfy the relationships shown in Table 13.

[0184] Table 13

[0185]

[0186]

[0187] 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; Wherein, 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, a third lens and a fourth lens; The second lens group includes, in order from the object side to the image side along the optical axis: a fifth lens, a sixth lens and a seventh lens; The third lens group includes, in order from the object side to the image side along the optical axis: an eighth lens, a ninth lens, a tenth lens, an eleventh lens and a twelfth lens; The fourth lens group includes, in order from the object side to the image side along the optical axis: a thirteenth lens and a fourteenth lens; The fifth lens group includes, in order from the object side to the image side along the optical axis: a fifteenth lens and a sixteenth 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 the position of the imaging surface during zooming.

2. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 2.1≤FG1 / Fw≤3.1, 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.

3. The zoom lens according to claim 1, wherein: The zoom lens satisfies: -1≤FG2 / Fw≤-0.5, 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.

4. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 0.9≤FG3 / Fw≤1.7, 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.

5. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 1≤FG4 / Fw≤3, wherein FG4 is the effective focal length of the fourth lens group, and Fw is the total effective focal length of the zoom lens at the wide-angle end.

6. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 3≤|FG5 / Fw|≤13, 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.

7. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 5.75≤TTL / d2≤8, wherein TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the zoom lens, and d2 is the on-axis distance between the position of the second lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the second lens group on the optical axis when the zoom lens is at the telephoto end.

8. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 0.3≤100*d4 / TTL≤3.5, 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 d4 is the on-axis distance between the position of the fourth lens group on the optical axis when the zoom lens is at the wide-angle end and the position of the fourth lens group on the optical axis when the zoom lens is at the telephoto end.

9. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 3.5≤ΦG1 / H≤5.6, wherein ΦG1 is the maximum full aperture of the lenses in the first lens group, and H is the full image height of the zoom lens.

10. The zoom lens according to claim 1, wherein: The zoom lens satisfies: 0<1-2Ft*tan(FOV_t / 2) / H≤0.045, wherein Ft is the total effective focal length of the zoom lens when it is at the telephoto end, and FOV_t is the full field of view angle of the zoom lens when it is at the telephoto end.

Images