Zoom lens

Abstract

The application discloses 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 refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive power, and a fifth lens group with positive or negative refractive power; wherein the first lens group, the third lens group and the fifth lens group are fixed groups, the second lens group is a zoom group, the fourth lens group is a focusing group, the third lens group comprises, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with positive refractive power and a third lens with negative refractive power; the zoom lens satisfies 13.1 <= TTL / (ft / fw) <= 32.8, wherein TTL is the distance from the object side surface of the lens closest to the object side in the zoom lens to the imaging surface of the zoom lens on the optical axis, 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.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to a zoom lens. Background Technology

[0002] With the development of facial recognition technology, people have put forward higher requirements for the aperture, distortion, image plane, resolution, infrared performance, and high and low temperature performance of camera lenses.

[0003] Currently used zoom lenses generally have the following drawbacks: 1) Small aperture, which cannot meet the brightness requirements of images in low-light environments; 2) Inconsistent aperture, which cannot guarantee consistent image brightness throughout the zoom process; 3) Large absolute value of distortion during zoom, resulting in significant image deformation; 4) Inability to balance large image size with small volume, failing to meet the lens's space requirements; 5) Low resolution, with current mainstream 1080P lenses having a resolution of around 2 million pixels, which is no longer sufficient to meet the high pixel requirements of face recognition; 6) Lack of thermal optical correction, meaning that different operating temperatures have a significant impact on lens performance, failing to meet the real-time requirements of face recognition in high and low temperature environments.

[0004] Therefore, designing a zoom lens with a constant ultra-large aperture, small size, low distortion, low cost, high magnification, and a resolution of 4K or higher is one of the hot topics of research for those skilled in the art. Summary of the Invention

[0005] This application provides a zoom lens comprising, along the optical axis from the object side to the image side, the following elements in sequence: a first lens group having positive optical power, which is a fixed group; a second lens group having negative optical power, which is a zoom group; a third lens group having positive optical power, which is a fixed group; a fourth lens group having positive optical power, which is a focusing group; and a fifth lens group having either positive or negative optical power, which is a fixed group, wherein the number of lenses having optical power in the fifth lens group is one; wherein the third lens group comprises, along the optical axis from the object side to the image side, the following elements in sequence: a first lens having positive optical power... The zoom lens consists of a first lens, a second lens with positive optical power, and a third lens with negative optical power. The second lens group moves along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle end and the telephoto end. The fourth lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming. The zoom lens satisfies the following condition: 13.1 ≤ TTL / (ft / fw) ≤ 32.8, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the image plane of the zoom lens, ft is the total effective focal length of the zoom lens at the telephoto end, and fw is the total effective focal length of the zoom lens at the wide-angle end.

[0006] In one embodiment, the first lens group has three lenses with optical power, wherein the first lens group includes two lenses with positive optical power and one lens with negative optical power.

[0007] In one embodiment, the first lens group sequentially includes, along the optical axis from the object side to the image side: a first lens having negative optical power; a second lens having positive optical power; and a third lens having positive optical power.

[0008] In one embodiment, the first lens group includes a cemented doublet lens.

[0009] In one embodiment, the object-side surface of the first lens is convex and the image-side surface is concave; the image-side surface of the third lens is concave.

[0010] In one embodiment, the number of lenses with optical power in the second lens group is three or four, and the second lens group includes at least two lenses with negative optical power.

[0011] In one embodiment, the lens closest to the object side in the second lens group has negative optical power.

[0012] In one embodiment, the second lens group includes at least two plastic lenses.

[0013] In one embodiment, the second lens group includes a lens with positive optical power.

[0014] In one embodiment, the lens closest to the image side in the second lens group is a plastic lens.

[0015] In one embodiment, the third lens group includes at least six lenses with optical power.

[0016] In one embodiment, the third lens group includes at least two plastic lenses.

[0017] In one embodiment, the third lens group includes at least two lenses with negative optical power.

[0018] In one embodiment, the third lens group includes at least four lenses with positive optical power.

[0019] In one embodiment, the third lens group includes at least one cemented lens.

[0020] In one embodiment, the object-side surface of the first lens closest to the object side in the third lens group is convex.

[0021] In one embodiment, the lens closest to the object side in the third lens group is a glass lens.

[0022] In one embodiment, the fourth lens group has two or three lenses with optical power, and the fourth lens group includes at least one lens with positive optical power and at least one lens with negative optical power.

[0023] In one embodiment, the fourth lens group includes at least one plastic lens.

[0024] In one embodiment, the lens closest to the object side in the fourth lens group has positive optical power.

[0025] In one embodiment, the lens closest to the image side in the fourth lens group is a plastic lens.

[0026] In one implementation, the zoom lens satisfies: 6≤TTL / φ≤12, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the imaging surface of the zoom lens, and φ is the diameter of the imaging surface of the zoom lens.

[0027] In one embodiment, the zoom lens satisfies: 2.8 ≤ TTL / (d12t-d12w) ≤ 7, where TTL is the distance along the optical axis from the object-side surface of the lens closest to the object side of the zoom lens to the imaging plane of the zoom lens, d12t is the distance along the optical axis from the image-side surface of the lens closest to the image side of the first lens group to the object-side surface of the lens closest to the object side of the second lens group when the zoom lens is at the telephoto end, and d12w is the distance along the optical axis from the image-side surface of the lens closest to the image side of the first lens group to the object-side surface of the lens closest to the object side of the second lens group when the zoom lens is at the wide-angle end.

[0028] In one embodiment, the zoom lens satisfies: 3≤(d12t-d12w) / (ft / fw)≤9, where d12t is the distance along the optical axis from the image side of the lens closest to the image side in the first lens group to the object side of the lens closest to the object side in the second lens group when the zoom lens is at the telephoto end, d12w is the distance along the optical axis from the image side of the lens closest to the image side in the first lens group to the object side of the lens closest to the object side in the second lens group 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, and fw is the total effective focal length when the zoom lens is at the wide-angle end.

[0029] In one embodiment, the zoom lens satisfies: 1.5≤TTL / f3≤6, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the imaging plane of the zoom lens, and f3 is the effective focal length of the third lens group.

[0030] In one implementation, the zoom lens satisfies: 0.3≤f4 / fw≤7.6, where f4 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.

[0031] In one embodiment, at least one plastic lens in the second lens group has an Abbe number VD2i that satisfies: VD2i≥50, and at least one plastic lens in the second lens group has an Abbe number VD2j that satisfies: VD2j≤30, wherein VD2i and VD2j are the Abbe numbers of two different plastic lenses in the second lens group, respectively.

[0032] In one embodiment, at least one plastic lens in the third lens group has an Abbe number VD3i that satisfies: VD3i≥50, and at least one plastic lens in the third lens group has an Abbe number VD3j that satisfies: VD3j≤30, wherein VD3i and VD3j are the Abbe numbers of two different plastic lenses in the third lens group.

[0033] In one embodiment, the third lens group comprises two low-dispersion glass lenses, satisfying: 65≤VD3a≤100 and 1.4≤ND3a≤1.60, where VD3a and ND3a are the Abbe number and refractive index of the low-dispersion glass lens in the third lens group, respectively.

[0034] In one implementation, the zoom lens satisfies: 2.9 ≤ ft / fw ≤ 6, 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.

[0035] In one embodiment, the zoom lens satisfies: 0.7≤ft / sd11≤1.5, where ft is the total effective focal length of the zoom lens at the telephoto end, and sd11 is the effective aperture of the lens closest to the object side in the first lens group.

[0036] In one embodiment, the zoom lens satisfies: 2≤TTL / sd31≤7, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the imaging plane of the zoom lens, and sd31 is the effective aperture of the lens closest to the object side in the third lens group.

[0037] In one embodiment, the zoom lens satisfies: 1.5 ≤ sd31 / fw ≤ 2.5, where sd31 is the effective aperture of the lens closest to the object side in the third lens group, and fw is the total effective focal length of the zoom lens at the wide-angle end.

[0038] In the exemplary embodiments of this application, a five-group, two-motor architecture (fixed + zoom + fixed + focus + fixed) is adopted. By rationally setting the optical power of the first to fifth lens groups and satisfying 13.1 ≤ TTL / (ft / fw) ≤ 32.8, the total effective focal length of the zoom lens at the telephoto and wide-angle ends is rationally designed on the basis of miniaturization, achieving reasonable aberration distribution. This results in high-efficiency zoom at high magnification and excellent resolution across the entire focal length range while ensuring low tolerance sensitivity of each group. The zoom lens provided by this application has at least one of the following beneficial effects: continuous zoom, constant large aperture, small size, low distortion, low cost, high magnification, and high resolution. Attached Figure Description

[0039] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0040] Figure 1A and Figure 1B These are schematic diagrams of the zoom lens at the wide-angle end and the telephoto end according to Embodiment 1 of this application;

[0041] Figure 1C , Figure 1D and Figure 1E These are, respectively, the magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 1 of this application;

[0042] Figure 1F , Figure 1G and Figure 1H These are, respectively, the magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 1 of this application;

[0043] Figure 2A and Figure 2B These are schematic diagrams of the zoom lens at the wide-angle end and the telephoto end according to Embodiment 2 of this application;

[0044] Figure 2C , Figure 2D and Figure 2E These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 2 of this application;

[0045] Figure 2F , Figure 2G and Figure 2H These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 2 of this application;

[0046] Figure 3A and Figure 3B These are schematic diagrams of the zoom lens at the wide-angle end and the telephoto end according to Embodiment 3 of this application;

[0047] Figure 3C , Figure 3D and Figure 3E These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 3 of this application;

[0048] Figure 3F , Figure 3G and Figure 3H These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 3 of this application;

[0049] Figure 4A and Figure 4B These are schematic diagrams of the zoom lens at the wide-angle end and the telephoto end according to Embodiment 4 of this application;

[0050] Figure 4C , Figure 4D and Figure 4E These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 4 of this application; and

[0051] Figure 4F , Figure 4G and Figure 4H These are the magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 4 of this application. Detailed Implementation

[0052] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this 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.

[0053] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0054] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0055] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0056] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0057] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] The features, principles and other aspects of this application are described in detail below.

[0060] A zoom lens according to an exemplary embodiment of this application may include five lens groups with optical power: a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with positive optical power, and a fifth lens group with either positive or negative optical power. These five lens groups are arranged sequentially along the optical axis from the object side to the image side. The first, third, and fifth lens groups are fixed groups, and their positions relative to the imaging plane of the zoom lens are fixed. The second lens group is the zoom group, which can move along the optical axis between the object side and the image side to enable continuous zooming between the wide-angle and telephoto ends. The fourth lens group is the focusing group, which moves along the optical axis in a manner corresponding to the movement of the second lens group to compensate for changes in the image plane position during zooming.

[0061] In an exemplary embodiment, the number of lenses with optical power in the fifth lens group is one, and the fifth lens group may have positive optical power or negative optical power.

[0062] In an exemplary embodiment, the third lens group may include at least six lenses with optical power. For example, the number of lenses with optical power in the third lens group is six or seven.

[0063] In an exemplary embodiment, the third lens group may include at least two plastic lenses.

[0064] In an exemplary embodiment, the third lens group may include at least two lenses with negative optical power.

[0065] In an exemplary embodiment, the third lens group may include at least four lenses with positive optical power.

[0066] In an exemplary embodiment, the third lens group may include at least one cemented lens.

[0067] In an exemplary embodiment, the lens closest to the object side in the third lens group has positive optical power, and the object side of this lens is convex.

[0068] In an exemplary embodiment, the lens closest to the object side in the third lens group is a glass lens.

[0069] In an exemplary embodiment, the third lens group sequentially includes, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with positive optical power, and a third lens with negative optical power.

[0070] The third lens group of this application adopts the above-mentioned lens allocation method, which is beneficial to the correction of lens aberration and chromatic aberration, and also beneficial to the achievement of a large aperture of the lens.

[0071] In an exemplary embodiment, the first lens group comprises three lenses with optical power, including two lenses with positive optical power and one lens with negative optical power. Further, in an exemplary embodiment, the first lens group sequentially comprises, along the optical axis from the object side to the image side, a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power.

[0072] In an exemplary embodiment, the object-side surface of the first lens in the first lens group is convex, and the image-side surface is concave; the image-side surface of the third lens is concave.

[0073] In an exemplary embodiment, the first lens group may include a cemented doublet lens. For example, the first lens and the second lens constitute a cemented doublet lens.

[0074] The first lens group of this application adopts the above-mentioned lens allocation method, which is beneficial to reducing the front diameter of the lens and to chromatic aberration correction at the telephoto end of the lens.

[0075] In an exemplary embodiment, the number of lenses with optical power in the second lens group is three or four, and the second lens group may include at least two lenses with negative optical power.

[0076] In an exemplary embodiment, the lens closest to the object side in the second lens group may have negative optical power.

[0077] In an exemplary embodiment, the second lens group may include at least two plastic lenses.

[0078] In an exemplary embodiment, the second lens group may include a lens with positive optical power.

[0079] In an exemplary embodiment, the lens closest to the image side in the second lens group is a plastic lens.

[0080] The second lens group of this application adopts the above-mentioned lens allocation method, which is beneficial to improving the zoom efficiency of the lens, beneficial to lens aberration correction, and beneficial to solving the problem of focus drift at high and low temperatures across the entire focal length. It is also beneficial to correct the distortion value of the lens during zooming.

[0081] In an exemplary embodiment, the fourth lens group may include at least one lens with positive optical power and at least one lens with negative optical power.

[0082] In an exemplary embodiment, the fourth lens group may contain two or three lenses with optical power, and the fourth lens group may include at least one plastic lens.

[0083] In an exemplary embodiment, the lens closest to the object side in the fourth lens group has positive optical power, and the lens closest to the image side in the fourth lens group is a plastic lens.

[0084] The fourth lens group of this application adopts the above-mentioned lens allocation method, which is beneficial to the correction of lens aberrations and chromatic aberrations, and also helps to reduce the group sensitivity of the fourth lens group.

[0085] In an exemplary embodiment, the zoom lens according to this application further includes an aperture stop disposed between the second lens group and the third lens group.

[0086] In an exemplary embodiment, the position of the second lens group along the optical axis is adjustable; 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 to enable continuous zooming of the zoom lens. 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, thereby enabling continuous zooming of the zoom lens.

[0087] In an exemplary embodiment, the position of the fourth lens group along the optical axis is adjustable. For example, the fourth lens group can move along the optical axis in a manner corresponding to the movement of the second lens group to achieve a compensation effect, so that the zoom lens has a better imaging position and stable imaging quality during continuous zooming.

[0088] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 13.1 ≤ TTL / (ft / fw) ≤ 32.8, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the imaging plane of the zoom lens, ft is the total effective focal length of the zoom lens at the telephoto end, and fw is the total effective focal length of the zoom lens at the wide-angle end. When TTL / (ft / fw) is less than 13.1, aberration and chromatic aberration correction is difficult, making it difficult to achieve a large aperture; when TTL / (ft / fw) is greater than 32.8, the lens size increases, zoom efficiency is low, and cost increases. This application satisfies 13.1 ≤ TTL / (ft / fw) ≤ 32.8, which is beneficial for achieving reasonable aberration distribution and high image quality while maintaining miniaturization.

[0089] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 6 ≤ TTL / φ ≤ 12, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the imaging plane of the zoom lens, and φ is the diameter of the imaging plane of the zoom lens. More specifically, the zoom lens further satisfies 8.4 ≤ TTL / φ ≤ 11.9. When TTL / φ is less than 6, aberration balance at the telephoto end is limited, making it difficult to improve resolution. When TTL / φ is greater than 12, the lens size increases, zoom efficiency is low, and cost increases. This application satisfies 6 ≤ TTL / φ ≤ 12, which is beneficial for improving resolution and achieving high image quality while maintaining miniaturization.

[0090] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 2.8 ≤ TTL / (d12t-d12w) ≤ 7, where TTL is the distance along the optical axis from the object-side surface of the lens closest to the object side in the zoom lens to the imaging plane of the zoom lens; d12t is the distance along the optical axis from the image-side surface of the lens closest to the image side in the first lens group to the object-side surface of the lens closest to the object side in the second lens group when the zoom lens is at the telephoto end; and d12w is the distance along the optical axis from the image-side surface of the lens closest to the image side in the first lens group to the object-side surface of the lens closest to the object side in the second lens group when the zoom lens is at the wide-angle end. More specifically, the zoom lens further satisfies: 2.8 ≤ TTL / (d12t-d12w) ≤ 6. When TTL / (d12t-d12w) is less than 2.8, the lens size increases, design costs rise, zoom efficiency decreases, and distortion increases. When TTL / (d12t-d12w) is greater than 7, aberrations between the first and second lens groups increase, the lens's resolving power decreases, and group tolerance sensitivity worsens. Meeting the condition 2.8 ≤ TTL / (d12t-d12w) ≤ 7 is beneficial for balancing aberrations between the first and second lens groups while maintaining miniaturization, improving resolving power, achieving high image quality, reducing group tolerance sensitivity, and increasing lens assembly production yield.

[0091] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 3≤(d12t-d12w) / (ft / fw)≤9, where d12t is the distance along the optical axis from the image-side surface of the lens closest to the image side in the first lens group to the object-side surface of the lens closest to the object side in the second lens group when the zoom lens is at the telephoto end, d12w is the distance along the optical axis from the image-side surface of the lens closest to the image side in the first lens group to the object-side surface of the lens closest to the object side in the second lens group 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, and fw is the total effective focal length when the zoom lens is at the wide-angle end. More specifically, the zoom lens further satisfies: 3.9≤(d12t-d12w) / (ft / fw)≤6.5. When (d12t-d12w) / (ft / fw) is less than 3, the lens size increases, the design cost increases, and the zoom efficiency is low; when (d12t-d12w) / (ft / fw) is greater than 9, the aberrations between the first lens group and the second lens group increase, the lens resolution decreases, and the sensitivity of group tolerance deteriorates.

[0092] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 1.5 ≤ TTL / f3 ≤ 6, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the imaging plane of the zoom lens, and f3 is the effective focal length of the third lens group. More specifically, the zoom lens further satisfies: 2.1 ≤ TTL / f3 ≤ 5. When TTL / f3 is less than 1.5, the lens aberrations are difficult to correct, and the lens tolerance sensitivity is poor; when TTL / f3 is greater than 6, the lens zoom efficiency is low, the size increases, and the design cost increases.

[0093] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 0.3 ≤ f4 / fw ≤ 7.6, where f4 is the effective focal length of the fourth lens group, and fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, the zoom lens further satisfies: 1.0 ≤ f4 / fw ≤ 7.0. When f4 / fw is greater than 7.6, the lens's focusing group tolerance sensitivity is poor; when f4 / fw is less than 0.3, the lens's focusing efficiency is low, and aberrations are difficult to correct.

[0094] In an exemplary embodiment of this application, at least one plastic lens in the second lens group has an Abbe number VD2i that satisfies: VD2i≥50, and at least one plastic lens in the second lens group has an Abbe number VD2j that satisfies: VD2j≤30, where VD2i and VD2j are the Abbe numbers of two different plastic lenses in the second lens group. Satisfying this condition can effectively reduce field curvature and astigmatism caused by large incident angle light rays when the lens is at the wide-angle end, comprehensively improve the resolution at the wide-angle end, and play a key role in solving the problem of inconsistency in focus between the wide-angle end and the telephoto end of the system under high and low temperatures.

[0095] In an exemplary embodiment of this application, at least one plastic lens in the third lens group has an Abbe number VD3i that satisfies: VD3i ≥ 50, and at least one plastic lens in the third lens group has an Abbe number VD3j that satisfies: VD3j ≤ 30, where VD3i and VD3j are the Abbe numbers of two different plastic lenses in the third lens group, respectively. Satisfying this condition greatly helps in correcting system aberrations and chromatic aberrations, comprehensively improving the overall resolving power of the optical system, and playing a key role in solving the focus drift problem under high and low temperatures.

[0096] In an exemplary embodiment of this application, the third lens group includes two low-dispersion glass lenses, satisfying: 65≤VD3a≤100 and 1.4≤ND3a≤1.60, where VD3a and ND3a are the Abbe number and refractive index of the low-dispersion glass lens in the third lens group, respectively. The introduction of low-dispersion glass lenses into the third lens group can reasonably balance the chromatic aberration generated by the first and second lens groups, improve the infrared and ultraviolet performance of the system, comprehensively enhance the resolution throughout the zoom range, and achieve confocal focusing of visible light and infrared.

[0097] In an exemplary embodiment of this application, the zoom lens satisfies: 2.9 ≤ ft / fw ≤ 6, where ft is the total effective focal length of the zoom lens at the telephoto end, and fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, the zoom lens may further satisfy: 2.9 ≤ ft / fw ≤ 5.4. When ft / fw is less than 2.9, the lens zoom ratio is low, limiting its applicable scenarios. When ft / fw is greater than 6, the lens size increases, costs rise, and it becomes difficult to achieve the goal of a constant ultra-large aperture.

[0098] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 0.7 ≤ ft / sd11 ≤ 1.5, where ft is the total effective focal length of the zoom lens at the telephoto end, and sd11 is the effective aperture of the lens closest to the object side in the first lens group. More specifically, the zoom lens may further satisfy: 0.7 ≤ ft / sd11 ≤ 1.3. When ft / sd11 is greater than 1.5, it is difficult to achieve the goal of a super-large aperture at the telephoto end, and the relative illumination in the intermediate focal length range is difficult to improve. When ft / sd11 is less than 0.7, it is difficult to correct chromatic aberration in the lens, and the lens size increases, leading to higher costs.

[0099] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 2 ≤ TTL / sd31 ≤ 7, where TTL is the distance on the optical axis from the object side of the lens closest to the object side to the imaging plane of the zoom lens, and sd31 is the effective aperture of the lens closest to the object side in the third lens group. More specifically, the zoom lens may further satisfy: 3.6 ≤ TTL / sd31 ≤ 6.7. When TTL / sd31 is greater than 7, the lens size increases, and the cost rises; when TTL / sd31 is less than 2, chromatic aberration and other aberrations are difficult to correct.

[0100] In an exemplary embodiment of this application, the zoom lens according to this application satisfies: 1.5 ≤ sd31 / fw ≤ 2.5, where sd31 is the effective aperture of the lens closest to the object side in the third lens group, and fw is the total effective focal length of the zoom lens at the wide-angle end. More specifically, the zoom lens may further satisfy: 1.6 ≤ sd31 / fw ≤ 2.2. When sd31 / fw is greater than 2.5, chromatic aberration is difficult to correct, the lens size increases, costs rise, and aspherical surface processing becomes difficult. When sd31 / fw is less than 1.5, a large field of view at the wide-angle end of the lens is difficult to achieve, and a super-large aperture is also difficult to achieve.

[0101] For example, the distance TTL on the optical axis from the object side of the lens closest to the object side in the zoom lens of this application to the imaging plane of the zoom lens can satisfy: TTL≤100mm.

[0102] In an exemplary embodiment, this application utilizes a combination of spherical and aspherical lenses, which helps reduce the manufacturing difficulty of the lenses. Simultaneously, through material selection, a heat-free design can be achieved. This application does not specifically limit the number of spherical and aspherical lenses; when image quality is paramount, the number of aspherical lenses can be increased, or even all lenses can be aspherical. The characteristic of aspherical lenses is that their curvature changes continuously from the center to the periphery. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have better radius of curvature characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving the image quality of the lens.

[0103] The zoom lens according to this application includes a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with positive optical power, and a fifth lens group with either positive or negative optical power. It also includes an aperture stop disposed between the second and third lens groups. By moving the zoom group and the focus group, continuous zoom between the wide-angle end and the telephoto end can be achieved, while maintaining clear focus on the image plane during zooming.

[0104] The zoom lens of this application adopts a glass-plastic hybrid lens structure, with a reasonable distribution of anomalous dispersion glass and high refractive index glass to achieve high-quality imaging effect.

[0105] The zoom lens of this application uses a variable aperture, which keeps the aperture constant during zooming, with a maximum aperture of F1.0, to meet the lens's requirement to ensure image brightness in low-light environments.

[0106] The zoom lens of this application has excellent resolution, with a resolution of 4K or higher.

[0107] The zoom lens of this application is small in size, maximizing performance within the smallest possible volume.

[0108] The zoom lens of this application achieves chromatic aberration and secondary spectrum correction in the 420-940nm band, and can maintain resolution without refocusing when switching between day and night.

[0109] The zoom lens of this application solves the problem of focus drift in high and low temperature environments while taking into account infrared performance. This makes the zoom lens of this application not blurry in the temperature range of -40℃ to 80℃, and it is suitable for various high and low temperature environments, which greatly expands the application range of the zoom lens of this application.

[0110] The zoom lens of this application has an absolute distortion value of less than or equal to 6% throughout the zoom range, ensuring minimal distortion in the captured image.

[0111] The zoom lens of this application has a wide focusing distance range, and can ensure clear focus from 0.1m to infinity throughout the zoom range, resulting in good image quality.

[0112] The zoom lens of this application adopts a glass-plastic hybrid structure, which reduces design costs while ensuring a large magnification.

[0113] The zoom lens of this application has good individual component and assembly tolerances and good manufacturability.

[0114] This application, by reasonably setting the optical power of each lens group and the optical power and surface shape of each lens, is beneficial to the zoom lens in terms of the ability to correct optical aberrations and chromatic aberrations when switching between wide-angle and telephoto ends. At the same time, it helps to reduce the tolerance sensitivity of the system and improve the uniformity of the image.

[0115] Alternatively, in other alternative exemplary embodiments, the zoom lens described above may also be equipped with a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0116] However, those skilled in the art will understand that the number of lenses constituting the zoom lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although sixteen or seventeen lenses are described as examples in the embodiments, the zoom lens is not limited to including sixteen or seventeen lenses. If desired, the zoom lens may also include other numbers of lenses.

[0117] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the zoom lens applicable to the above-described embodiments.

[0118] Example 1

[0119] The following is for reference Figures 1A to 1H The zoom lens 100 according to Embodiment 1 of this application is described. Figure 1A This is a schematic diagram of the zoom lens 100 at the wide-angle end according to Embodiment 1 of this application. Figure 1B This is a schematic diagram of the zoom lens 100 at the telephoto end according to Embodiment 1 of this application.

[0120] like Figure 1A and Figure 1B As shown, the zoom lens 100 includes, from the object side to the image side, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with positive optical power, and an image plane Image.

[0121] The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3. The first lens L1 may have negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 may have positive optical power, with its object-side surface S2 being convex and its image-side surface S3 being convex. The third lens L3 may have positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0122] The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The fourth lens L4 can have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens L5 can have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens L6 can have positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The seventh lens L7 can have negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being concave.

[0123] The third lens group G3 includes the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13. The eighth lens L8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The ninth lens L9 has positive optical power, with its object-side surface S17 being convex and its image-side surface S18 being convex. The tenth lens L10 has negative optical power, with its object-side surface S19 being concave and its image-side surface S20 being concave. The eleventh lens L11 has positive optical power, with its object-side surface S21 being convex and its image-side surface S22 being convex. The twelfth lens L12 has negative optical power, with its object-side surface S22 being concave and its image-side surface S23 being concave. The thirteenth lens L13 has positive optical power, with its object-side surface S24 being convex and its image-side surface S25 being convex. The eleventh lens L11 and the twelfth lens L12 are cemented together to form a cemented doublet lens.

[0124] The fourth lens group G4 includes the fourteenth lens L14 and the fifteenth lens L15. The fourteenth lens L14 can have positive optical power, with its object-side surface S26 being convex and its image-side surface S27 being concave. The fifteenth lens L15 can have negative optical power, with its object-side surface S28 being convex and its image-side surface S29 being concave.

[0125] The fifth lens group G5 includes the sixteenth lens L16. The sixteenth lens L16 has positive optical power, its object side S30 is convex, and its image side S31 is concave.

[0126] The stop aperture can be set between the second lens group G2 and the third lens group G3. More specifically, the stop aperture can be set between the seventh lens L7 and the eighth lens L8.

[0127] Light from the object passes sequentially through each surface (i.e., sequentially through the object side surface S1 of the first lens L1 to the image side surface S31 of the sixteenth lens L16) and is finally imaged on the imaging surface Image, where an image sensing chip may be provided.

[0128] Table 1 shows the basic parameters of the zoom lens 100 of Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0129]

[0130]

[0131] Table 1

[0132] In Example 1, the sixth lens L6 and the seventh lens L7 in the second lens group G2 are plastic lenses. In order from the object side to the image side along the optical axis, the sixth lens L6 is the third lens of the second lens group with an Abbe number Vd23 of 20.37, and the seventh lens L7 is the fourth lens of the second lens group with an Abbe number Vd24 of 55.71.

[0133] In Example 1, the ninth lens L9 and the tenth lens L10 in the third lens group G3 are plastic lenses. In order from the object side to the image side along the optical axis, the ninth lens L9 is the second lens of the third lens group with an Abbe number Vd32 of 55.71, and the tenth lens L10 is the third lens of the third lens group with an Abbe number Vd33 of 23.53.

[0134] In Example 1, the eleventh lens L11 and the thirteenth lens L13 in the third lens group G3 are low-dispersion glass lenses. Following the order along the optical axis from the object side to the image side, the eleventh lens L11 is the fourth lens in the third lens group, with a refractive index Nd34 of 1.55 and an Abbe number Vd34 of 75.50. The thirteenth lens L13 is the sixth lens in the third lens group, with a refractive index Nd36 of 1.50 and an Abbe number Vd36 of 81.61.

[0135] In Embodiment 1, by changing the position of the second lens group G2 on the optical axis, the total effective focal length of the zoom lens 100 can be continuously variable. At the same time, by adjusting the position of the fourth lens group G4 on the optical axis, the image plane of the zoom lens 100 can be clearly focused during the zooming process.

[0136] Table 2 shows the air spacing on the optical axis of the first and second lens groups (D5), the second and third lens groups (D13), the third and fourth lens groups (D25), and the fourth and fifth lens groups (D29) of the zoom lens 100 in Embodiment 1 when it is in the wide-angle and telephoto positions. Table 2 also shows the total effective focal length F, total optical length TTL, and aperture value Fno of the zoom lens 100. F changes as the zoom lens 100 switches from the wide-angle to the telephoto end or vice versa, while TTL and Fno remain constant. All values ​​for F, TTL, D5, D13, D25, and D29 are in millimeters (mm).

[0137] Wide-angle end telephoto end F 9.118(fw) 38.833 (ft) Fno 1.05 1.05 TTL 86.77 86.77 D5 1.67 26.47 D13 25.48 0.68 D25 1.93 1.72 D29 3.91 4.12

[0138] Table 2

[0139] In Example 1, the object-side and image-side surfaces of the sixth lens L6, the seventh lens L7, the ninth lens L9, the tenth lens L10, the fifteenth lens L15, and the sixteenth lens L16 are all aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0140]

[0141] Where x is the distance vector from the vertex of the aspherical surface at a height 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 radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the conic coefficient k and higher-order coefficients A4, A6, A8, A4, A5, A6, A7, A8, A9 ... 10 A 12 A 14 and A 16 .

[0142] Face number k A4 A6 A8 A10 A12 A14 A16 S10 10.085 -1.33E-04 -2.09E-07 -1.01E-08 1.15E-10 6.75E-13 -1.62E-14 1.01E-16 S11 27.172 -1.61E-04 9.37E-07 5.12E-09 -9.44E-11 8.84E-14 -8.58E-15 3.40E-16 S12 4.414 3.45E-05 5.90E-07 1.43E-08 -1.97E-10 -1.23E-12 2.79E-14 2.38E-16 S13 25.597 1.97E-06 -9.76E-07 -5.78E-09 1.58E-10 -2.78E-12 3.49E-14 -1.82E-16 S17 -0.972 -8.25E-05 -5.86E-07 9.98E-10 -2.47E-11 9.30E-14 3.69E-15 -2.79E-17 S18 19.539 1.27E-04 3.38E-07 3.08E-09 -1.06E-11 3.60E-13 2.39E-15 -1.98E-17 S19 -29.879 1.04E-04 2.24E-07 1.43E-09 8.94E-12 1.13E-13 1.14E-15 2.56E-18 S20 -20.416 -3.35E-05 -7.05E-07 1.17E-09 5.62E-13 -1.48E-14 8.50E-16 0.00E+00 S28 -0.551 -2.01E-04 -2.69E-06 1.50E-08 2.30E-10 -4.03E-12 1.91E-14 -5.37E-27 S29 -0.607 -3.68E-05 -2.68E-06 5.22E-08 9.39E-10 -2.93E-21 2.71E-25 5.74E-28 S30 -10.094 -5.58E-04 -1.02E-05 -8.62E-08 1.70E-09 0.00E+00 0.00E+00 0.00E+00 S31 -6.148 -6.17E-04 -1.42E-05 2.02E-07 -8.14E-10 0.00E+00 0.00E+00 0.00E+00

[0143] Table 3

[0144] Figure 1C , Figure 1D and Figure 1E These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 1 of this application. Figure 1F , Figure 1G and Figure 1H These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 1 of this application. Figures 1C to 1H It can be seen that the zoom lens 100 given in Example 1 can achieve good imaging quality at different focal lengths.

[0145] Example 2

[0146] The following is for reference Figures 2A to 2H The zoom lens 200 according to Embodiment 2 of this application is described. Figure 2A This is a schematic diagram of the zoom lens 200 at the wide-angle end according to Embodiment 2 of this application. Figure 2B This is a schematic diagram of the zoom lens 200 at the telephoto end according to Embodiment 2 of this application.

[0147] In this embodiment and the following embodiments, for the sake of brevity, the omitted parts are similar to the description in Embodiment 1.

[0148] like Figure 2A and Figure 2B As shown, the zoom lens 200 includes, from the object side to the image side, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an image plane Image.

[0149] The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3. The first lens L1 may have negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 may have positive optical power, with its object-side surface S2 being convex and its image-side surface S3 being convex. The third lens L3 may have positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0150] The second lens group G2 includes a fourth lens L4, a fifth lens L5, and a sixth lens L6. The fourth lens L4 can have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens L5 can have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens L6 can have positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex.

[0151] The third lens group G3 includes the seventh lens L7, the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13. The seventh lens L7 can have positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens L8 can have positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being convex. The ninth lens L9 can have negative optical power, with its object-side surface S17 being concave and its image-side surface S18 being concave. The tenth lens L10 can have negative optical power, with its object-side surface S19 being concave and its image-side surface S20 being concave. The eleventh lens L11 can have positive optical power, with its object-side surface S20 being convex and its image-side surface S21 being convex. The twelfth lens L12 can have negative optical power, with its object-side surface S21 being concave and its image-side surface S22 being convex. The thirteenth lens L13 can have positive optical power, and its object-side surface S23 is convex, as is its image-side surface S24. The tenth lens L10, the eleventh lens L11, and the twelfth lens L12 are cemented together to form a cemented triplicate lens.

[0152] The fourth lens group G4 includes the fourteenth lens L14 and the fifteenth lens L15. The fourteenth lens L14 can have positive optical power, with its object-side surface S25 being convex and its image-side surface S26 being concave. The fifteenth lens L15 can have negative optical power, with its object-side surface S27 being convex and its image-side surface S28 being concave.

[0153] The fifth lens group G5 includes the sixteenth lens L16. The sixteenth lens L16 has negative optical power, its object side S29 is convex, and its image side S30 is concave.

[0154] The stop aperture can be set between the second lens group G2 and the third lens group G3. More specifically, the stop aperture can be set between the sixth lens L6 and the seventh lens L7.

[0155] Light from the object passes through each surface in sequence (i.e., passes through the object side surface S1 of the first lens L1 to the image side surface S30 of the sixteenth lens L16 in sequence) and is finally imaged on the imaging surface Image, where an image sensing chip may be provided.

[0156] Table 4 shows the basic parameters of the zoom lens 200 of Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0157]

[0158]

[0159] Table 4

[0160] In Example 2, the fifth lens L5 and the sixth lens L6 in the second lens group G2 are plastic lenses. In order from the object side to the image side along the optical axis, the fifth lens L5 is the second lens of the second lens group with an Abbe number Vd22 of 55.71, and the sixth lens L6 is the third lens of the second lens group with an Abbe number Vd23 of 20.37.

[0161] In Example 2, the eighth lens L8 and the ninth lens L9 in the third lens group G3 are plastic lenses. In order from the object side to the image side along the optical axis, the eighth lens L8 is the second lens of the third lens group with an Abbe number Vd32 of 55.71, and the ninth lens L9 is the second lens of the third lens group with an Abbe number Vd32 of 23.53.

[0162] In Example 2, the eleventh lens L11 and the thirteenth lens L13 in the third lens group G3 are low-dispersion glass lenses. Following the order along the optical axis from the object side to the image side, the eleventh lens L11 is the fifth lens in the third lens group, with a refractive index Nd35 of 1.60 and an Abbe number Vd35 of 68.62. The thirteenth lens L13 is the seventh lens in the third lens group, with a refractive index Nd37 of 1.50 and an Abbe number Vd37 of 81.61.

[0163] In Embodiment 2, by changing the position of the second lens group G2 on the optical axis, the total effective focal length of the zoom lens 200 can be continuously variable. At the same time, by adjusting the position of the fourth lens group G4 on the optical axis, the image plane of the zoom lens 200 can be clearly focused during the zooming process.

[0164] Table 5 shows the air gaps on the optical axis of the first and second lens groups (D5), the second and third lens groups (D11), the third and fourth lens groups (D24), the fourth and fifth lens groups (D28), the total effective focal length F, the total optical length TTL, and the aperture value Fno of the zoom lens 200 when the zoom lens 200 is at the wide-angle and telephoto ends, respectively. The units of F, TTL, D5, D11, D24, and D28 are all millimeters (mm).

[0165] Wide-angle end telephoto end F 9.005(fw) 45.01 (ft) Fno 1.15 1.15 TTL 99.76 99.76 D5 4.4 34.67 D11 30.57 0.3 D24 2.61 3.26 D28 4.26 3.61

[0166] Table 5

[0167] Table 6 lists the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror in Example 2. 10 A 12 A 14 and A 16 .

[0168] Face number k A4 A6 A8 A10 A12 A14 A16 S8 -1.219 7.30E-05 -5.86E-07 2.78E-09 8.99E-11 -2.62E-12 2.87E-14 -1.12E-16 S9 29.597 4.54E-05 -2.66E-07 -1.43E-09 -3.88E-11 5.36E-14 1.19E-14 -1.48E-16 S10 5.027 -5.90E-06 -2.48E-07 -6.98E-09 -6.04E-11 4.83E-13 9.38E-15 -2.45E-16 S11 50 2.69E-05 -4.66E-07 -7.15E-09 5.47E-11 -4.50E-13 -6.80E-15 -8.29E-19 S15 -9.594 -9.79E-05 -6.40E-07 -5.39E-09 -4.95E-11 9.29E-13 1.09E-14 -8.49E-17 S16 8.119 1.13E-04 -4.38E-07 -1.77E-09 -2.20E-11 3.81E-13 1.47E-14 -1.05E-16 S17 11.422 8.37E-05 0.00E+00 9.35E-10 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S18 0.564 -1.43E-04 0.00E+00 -8.64E-10 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S27 0.299 6.74E-05 7.29E-08 -1.62E-09 6.48E-10 -2.38E-11 2.61E-13 -8.39E-16 S28 0.799 1.55E-04 8.60E-08 5.92E-08 -3.73E-10 -8.50E-12 1.33E-22 4.65E-25 S29 49.345 -1.09E-03 -2.19E-06 9.83E-08 -3.69E-10 0.00E+00 0.00E+00 0.00E+00 S30 12.144 -1.16E-03 -2.40E-06 2.01E-07 -2.64E-09 0.00E+00 0.00E+00 0.00E+00

[0169] Table 6

[0170] Figure 2C , Figure 2D and Figure 2E These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 2 of this application. Figure 2F , Figure 2G and Figure 2H These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 2 of this application. Figures 2C to 2H It can be seen that the zoom lens 200 given in Example 2 can achieve good imaging quality at different focal lengths.

[0171] Example 3

[0172] The following is for reference Figures 3A to 3H The zoom lens 300 according to Embodiment 3 of this application is described. Figure 3A This is a schematic diagram of the zoom lens 300 at the wide-angle end according to Embodiment 3 of this application. Figure 3B This is a schematic diagram of the zoom lens 300 at the telephoto end according to Embodiment 3 of this application.

[0173] like Figure 3A and Figure 3B As shown, the zoom lens 300 includes, from the object side to the image side, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an image plane Image.

[0174] The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3. The first lens L1 may have negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 may have positive optical power, with its object-side surface S2 being convex and its image-side surface S3 being concave. The third lens L3 may have positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0175] The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The fourth lens L4 can have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens L5 can have negative optical power, with its object-side surface S8 being concave and its image-side surface S9 being concave. The sixth lens L6 can have negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. The seventh lens L7 can have positive optical power, with its object-side surface S12 being convex, and its image-side surface S13 being adaptable to be convex, concave, or flat.

[0176] The third lens group G3 includes the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13. The eighth lens L8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The ninth lens L9 has positive optical power, with its object-side surface S17 being convex and its image-side surface S18 being convex. The tenth lens L10 has negative optical power, with its object-side surface S19 being concave and its image-side surface S20 being concave. The eleventh lens L11 has positive optical power, with its object-side surface S21 being convex and its image-side surface S22 being convex. The twelfth lens L12 has negative optical power, with its object-side surface S23 being concave and its image-side surface S24 being concave. The thirteenth lens L13 has positive optical power, with its object-side surface S24 being convex and its image-side surface S25 being concave. The twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented doublet lens.

[0177] The fourth lens group G4 includes the fourteenth lens L14, the fifteenth lens L15, and the sixteenth lens L16. The fourteenth lens L14 can have positive optical power, with its object-side surface S26 being convex and its image-side surface S27 being convex. The fifteenth lens L15 can have negative optical power, with its object-side surface S28 being convex and its image-side surface S29 being concave. The sixteenth lens L16 has negative optical power, with its object-side surface S30 being convex and its image-side surface S31 being concave.

[0178] The fifth lens group G5 includes the seventeenth lens L17. The seventeenth lens L17 has negative optical power, its object side S32 is convex, and its image side S33 is concave.

[0179] The stop aperture can be set between the second lens group G2 and the third lens group G3. More specifically, the stop aperture can be set between the seventh lens L7 and the eighth lens L8.

[0180] Light from the object passes sequentially through each surface (i.e., sequentially through the object side surface S1 of the first lens L1 to the image side surface S33 of the seventeenth lens L17) and is finally imaged on the imaging surface Image, where an image sensing chip may be provided.

[0181] Table 7 shows the basic parameters of the zoom lens 300 of Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0182]

[0183]

[0184] Table 7

[0185] In Example 3, the sixth lens L6 and the seventh lens L7 in the second lens group G2 are plastic lenses. In order from the object side to the image side along the optical axis, the sixth lens L6 is the third lens of the second lens group with an Abbe number Vd23 of 55.71, and the seventh lens L7 is the fourth lens of the second lens group with an Abbe number Vd24 of 20.37.

[0186] In Example 3, the ninth lens L9 and the tenth lens L10 in the third lens group G3 are plastic lenses. In order from the object side to the image side along the optical axis, the ninth lens L9 is the second lens of the third lens group with an Abbe number Vd32 of 55.71, and the tenth lens L10 is the third lens of the third lens group with an Abbe number Vd33 of 23.53.

[0187] In Example 3, the eleventh lens L11 and the thirteenth lens L13 in the third lens group G3 are low-dispersion glass lenses. Following the order along the optical axis from the object side to the image side, the eleventh lens L11 is the fourth lens in the third lens group, with a refractive index Nd34 of 1.60 and an Abbe number Vd34 of 68.62. The thirteenth lens L13 is the sixth lens in the third lens group, with a refractive index Nd36 of 1.50 and an Abbe number Vd36 of 81.61.

[0188] In embodiment 3, by changing the position of the second lens group G2 on the optical axis, the total effective focal length of the zoom lens 300 can be continuously variable. At the same time, by adjusting the position of the fourth lens group G4 on the optical axis, the image plane of the zoom lens 300 can be clearly focused during the zooming process.

[0189] Table 8 shows the air spacing on the optical axis of the first and second lens groups (D5), the second and third lens groups (D13), the third and fourth lens groups (D25), and the fourth and fifth lens groups (D31) of the zoom lens 300 in Embodiment 3 when it is in the wide-angle and telephoto positions. Table 8 also shows the total effective focal length F, total optical length TTL, and aperture value Fno of the zoom lens 300. F changes as the zoom lens 300 switches from the wide-angle to the telephoto end or vice versa, while TTL and Fno remain constant. All values ​​for F, TTL, D5, D13, D25, and D31 are in millimeters (mm).

[0190] Wide-angle end telephoto end F 12.004(fw) 49.204 (ft) Fno 1.20 1.20 TTL 89.76 89.76 D5 0.61 22.85 D13 22.54 0.3 D25 6.24 7.22 D31 3.14 2.16

[0191] Table 8

[0192] Table 9 lists the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror in Example 3. 10 A 12 A 14 and A 16 .

[0193] Face number k A4 A6 A8 A10 A12 A14 A16 S10 5.453 3.03E-05 1.12E-06 -3.57E-09 -1.87E-11 2.85E-12 -3.14E-14 2.12E-16 S11 3.607 -3.73E-05 3.41E-07 -8.41E-09 6.33E-11 6.95E-13 7.81E-15 -1.77E-16 S12 5.164 -2.06E-05 -6.01E-07 -7.85E-11 -1.58E-11 -9.46E-13 2.80E-14 -3.24E-16 S13 -50 1.79E-06 -1.45E-07 -4.82E-10 -7.85E-11 6.78E-13 -5.22E-15 -6.32E-17 S17 -0.215 -1.65E-05 1.53E-08 -6.62E-10 -4.27E-12 6.16E-15 8.75E-17 -1.93E-18 S18 -29.808 3.54E-05 1.09E-07 5.64E-10 -1.34E-12 -5.38E-14 -4.18E-16 2.27E-18 S19 -30.202 2.34E-05 2.29E-07 2.95E-10 -4.93E-12 -5.37E-14 -2.18E-16 2.89E-18 S20 -21.968 9.92E-06 -4.27E-08 -4.03E-10 -7.07E-12 -3.89E-14 3.01E-16 0.00E+00 S28 21.173 -2.39E-05 -1.16E-06 -4.94E-09 1.89E-10 -1.71E-13 -1.25E-14 -1.85E-27 S29 17.933 3.78E-05 -1.72E-06 -1.64E-08 1.52E-10 -1.35E-12 -7.31E-15 2.05E-27 S30 0.163 -1.79E-04 -1.07E-06 5.70E-08 -7.32E-10 -1.02E-11 1.67E-14 -1.12E-24 S31 -0.34 -2.51E-04 -1.55E-06 1.77E-07 -2.82E-09 -4.47E-12 -2.95E-24 -4.82E-27 S32 50 7.36E-04 3.16E-06 -3.65E-08 -1.00E-09 0.00E+00 0.00E+00 0.00E+00 S33 39.706 1.03E-03 8.90E-06 1.69E-07 -8.22E-10 0.00E+00 0.00E+00 0.00E+00

[0194] Table 9

[0195] Figure 3C , Figure 3D and Figure 3E These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 3 of this application. Figure 3F , Figure 3G and Figure 3H These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 3 of this application. Figures 3C to 3H It can be seen that the zoom lens 300 given in Example 3 can achieve good imaging quality at different focal lengths.

[0196] Example 4

[0197] The following is for reference Figures 4A to 4H The zoom lens 400 according to Embodiment 4 of this application is described. Figure 4A This is a schematic diagram of the zoom lens 400 at the wide-angle end according to Embodiment 4 of this application. Figure 4B This is a schematic diagram of the zoom lens 400 at the telephoto end according to Embodiment 4 of this application.

[0198] like Figure 4A and Figure 4BAs shown, the zoom lens 400 includes, from the object side to the image side, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with positive optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, and an image plane Image.

[0199] The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3. The first lens L1 may have negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 may have positive optical power, with its object-side surface S2 being convex and its image-side surface S3 being concave. The third lens L3 may have positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented doublet lens.

[0200] The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The fourth lens L4 can have negative optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens L5 can have negative optical power, with its object-side surface S8 being convex and its image-side surface S9 being concave. The sixth lens L6 can have positive optical power, with its object-side surface S10 being concave and its image-side surface S11 being convex. The seventh lens L7 can have negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being concave.

[0201] The third lens group G3 includes the eighth lens L8, the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13. The eighth lens L8 has positive optical power, with its object-side surface S15 and image-side surface S16 being convex. The ninth lens L9 has positive optical power, with its object-side surface S17 and image-side surface S18 being convex. The tenth lens L10 has negative optical power, with its object-side surface S19 and image-side surface S20 being concave. The eleventh lens L11 has positive optical power, with its object-side surface S21 and image-side surface S22 being convex. The twelfth lens L12 has negative optical power, with its object-side surface S22 and image-side surface S23 being concave. The thirteenth lens L13 has positive optical power, with its object-side surface S23 and image-side surface S24 being convex. The eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13 are cemented together to form a cemented triplet lens.

[0202] The fourth lens group G4 includes the fourteenth lens L14, the fifteenth lens L15, and the sixteenth lens L16. The fourteenth lens L14 has positive optical power, with its object-side surface S25 and image-side surface S26 being convex. The fifteenth lens L15 has positive optical power, with its object-side surface S27 and image-side surface S28 being convex. The sixteenth lens L16 has negative optical power, with its object-side surface S29 being convex and its image-side surface S30 being concave.

[0203] The fifth lens group G5 includes the seventeenth lens L17. The seventeenth lens L17 has negative optical power, its object side S31 is convex, and its image side S32 is concave.

[0204] The stop aperture can be set between the second lens group G2 and the third lens group G3. More specifically, the stop aperture can be set between the seventh lens L7 and the eighth lens L8.

[0205] Light from the object passes sequentially through each surface (i.e., sequentially through the object side surface S1 of the first lens L1 to the image side surface S32 of the seventeenth lens L17) and is finally imaged on the imaging surface Image, where an image sensing chip may be provided.

[0206] Table 10 shows the basic parameters of the zoom lens 400 of Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0207]

[0208]

[0209] Table 10

[0210] In Example 4, the sixth lens L6 and the seventh lens L7 in the second lens group G2 are plastic lenses. In order from the object side to the image side along the optical axis, the sixth lens L6 is the third lens of the second lens group with an Abbe number Vd23 of 20.37, and the seventh lens L7 is the fourth lens of the second lens group with an Abbe number Vd24 of 55.71.

[0211] In Example 4, the ninth lens L9 and the tenth lens L10 in the third lens group G3 are plastic lenses. In order from the object side to the image side along the optical axis, the ninth lens L9 is the second lens of the third lens group with an Abbe number Vd32 of 55.71, and the tenth lens L10 is the third lens of the third lens group with an Abbe number Vd33 of 23.53.

[0212] In Example 4, the eleventh lens L11 and the thirteenth lens L13 in the third lens group G3 are low-dispersion glass lenses. Following the order along the optical axis from the object side to the image side, the eleventh lens L11 is the fourth lens in the third lens group, with a refractive index Nd34 of 1.50 and an Abbe number Vd34 of 81.61. The thirteenth lens L13 is the sixth lens in the third lens group, with a refractive index Nd36 of 1.60 and an Abbe number Vd36 of 68.62.

[0213] In embodiment 4, by changing the position of the second lens group G2 on the optical axis, the total effective focal length of the zoom lens 400 can be continuously variable. At the same time, by adjusting the position of the fourth lens group G4 on the optical axis, the image plane of the zoom lens 400 can be clearly focused during the zooming process.

[0214] Table 11 shows the air spacing on the optical axis of the first and second lens groups (D5), the second and third lens groups (D13), the third and fourth lens groups (D24), and the fourth and fifth lens groups (D30) of the zoom lens 400 in Embodiment 4 when it is in the wide-angle and telephoto positions. Table 11 also shows the total effective focal length F, total optical length TTL, and aperture value Fno of the zoom lens 400, where F changes as the zoom lens 400 switches from the wide-angle to the telephoto end or vice versa, while TTL and Fno remain constant. The units for F, TTL, D5, D13, D24, and D30 are all millimeters (mm).

[0215] Wide-angle end telephoto end F 10.566 (fw) 35.002 (ft) Fno 1.08 1.08 TTL 99.17 99.17 D5 1.70 19.77 D13 18.6 0.53 D24 3.92 4.29 D30 2.68 2.31

[0216] Table 11

[0217] Table 12 lists the conic coefficient k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror in Example 4. 10 A 12 A 14 and A 16 .

[0218] Face number k A4 A6 A8 A10 A12 A14 A16 S10 -50 -1.09E-04 -7.32E-08 -3.38E-09 2.79E-11 -4.79E-13 1.39E-14 -6.53E-17 S11 4.77 -4.24E-05 1.15E-07 -2.75E-09 1.88E-11 5.14E-13 -2.32E-15 6.97E-17 S12 3.469 4.74E-06 -2.11E-07 5.02E-09 -3.34E-11 -5.00E-13 1.28E-15 1.20E-16 S13 -27.921 -7.34E-05 -2.86E-07 1.22E-09 2.72E-11 -4.10E-13 -1.77E-14 2.05E-16 S17 -1.685 -3.31E-05 -2.06E-07 1.25E-10 -8.30E-12 -1.37E-13 -4.45E-16 3.23E-17 S18 -25.004 6.11E-05 8.26E-08 9.47E-10 1.96E-12 -1.15E-13 1.72E-16 2.19E-17 S19 -33.508 5.65E-05 6.61E-07 2.34E-09 1.31E-11 2.77E-15 -2.27E-15 4.58E-18 S20 -25.588 -1.32E-05 9.02E-08 5.12E-09 9.20E-12 -3.76E-13 -1.18E-16 0.00E+00 S25 23.947 -3.18E-05 1.55E-06 9.98E-09 -1.09E-10 2.04E-13 -7.25E-15 5.61E-17 S26 -50 6.40E-05 1.51E-06 1.34E-08 -9.20E-11 -1.79E-13 -6.20E-15 4.67E-17 S29 0.188 -1.61E-04 -1.09E-06 4.10E-08 -5.26E-10 3.24E-12 -1.91E-14 -2.01E-16 S30 -0.567 -2.49E-04 -4.45E-06 1.63E-07 -2.94E-09 2.61E-11 -3.49E-13 -2.97E-27 S31 50 7.60E-04 6.46E-07 -1.14E-07 -8.41E-11 0.00E+00 0.00E+00 0.00E+00 S32 50 1.03E-03 5.46E-06 -2.19E-08 -2.13E-09 0.00E+00 0.00E+00 0.00E+00

[0219] Table 12

[0220] Figure 4C , Figure 4D and Figure 4E These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the wide-angle end according to Embodiment 4 of this application. Figure 4F , Figure 4G and Figure 4H These are, respectively, magnification chromatic aberration, positional chromatic aberration, and distortion diagrams of the zoom lens at the telephoto end according to Embodiment 4 of this application. Figures 4C to 4H It can be seen that the zoom lens 400 given in Example 4 can achieve good imaging quality at different focal lengths.

[0221] In summary, Examples 1 to 4 satisfy the relationships shown in Table 13.

[0222] Conditional / Example 1 2 3 4 6≤TTL / φ≤12 9.86 11.34 10.20 11.27 2.9≤ft / fw≤6 4.26 5.00 4.10 3.31 13.1 ≤ TTL / (ft / fw) ≤ 32.8 20.37 19.96 21.90 29.94 2.8≤TTL / (d12t-d12w)≤7 3.50 3.30 4.04 5.49 3≤(d12t-d12w) / (ft / fw)≤9 5.82 6.06 5.43 5.45 1.5≤TTL / f3≤6 3.36 4.52 2.78 2.53 0.3≤f4 / fw≤7.6 3.98 6.50 1.40 1.47 0.7 ≤ ft / sd11 ≤ 1.5 0.97 0.94 1.22 0.79 2≤TTL / sd31≤7 5.04 6.24 4.08 5.58 1.5 ≤ sd31 / fw ≤ 2.5 1.89 1.77 1.83 1.68

[0223] Table 13

[0224] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zoom lens, characterized in that, Along the optical axis from the object side to the image side, the following are included in sequence: A first lens group having positive optical power, wherein the first lens group is a fixed group; A second lens group with negative optical power, the second lens group being a zoom group; A third lens group with positive optical power, wherein the third lens group is a fixed group; A fourth lens group having positive optical power, wherein the fourth lens group is a focusing group; and A fifth lens group having positive or negative optical power, wherein the fifth lens group is a fixed group; The first lens group has three lenses with optical power, and the first lens group includes, along the optical axis from the object side to the image side, the following in sequence: a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power. The second lens group contains three lenses with optical power, the third lens group contains seven lenses with optical power, and the fourth lens group contains two lenses with optical power; or, The second lens group has four lenses with optical power, the third lens group has six lenses with optical power, and the fourth lens group has two or three lenses with optical power. The number of lenses with optical power in the fifth lens group is one; The third lens group comprises, along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with positive optical power, and a third lens with negative optical power. The zoom lens has five lens groups with optical power. The second lens group moves along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle end and the telephoto end; The fourth lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming. The zoom lens satisfies: 19.96≤TTL / (ft / fw)≤29.94, where TTL is the distance from the object side of the lens closest to the object side to the imaging plane of the zoom lens on the optical axis, 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.

2. The zoom lens according to claim 1, characterized in that, The first lens group includes a cemented doublet lens.

3. The zoom lens according to claim 1, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave; the image-side surface of the third lens is concave.

4. The zoom lens according to claim 1, characterized in that, The second lens group includes at least two lenses with negative optical power.

5. The zoom lens according to claim 4, characterized in that, The lens closest to the object side in the second lens group has negative optical power.

6. The zoom lens according to claim 4, characterized in that, The second lens group includes at least two plastic lenses.

7. The zoom lens according to claim 4, characterized in that, The second lens group includes a lens with positive optical power.

8. The zoom lens according to claim 4, characterized in that, The lens closest to the image side in the second lens group is a plastic lens.

9. The zoom lens according to claim 1, characterized in that, The third lens group contains two plastic lenses.

10. The zoom lens according to claim 1, characterized in that, The third lens group includes at least two lenses with negative optical power.

11. The zoom lens according to claim 1, characterized in that, The third lens group includes at least four lenses with positive optical power.

12. The zoom lens according to claim 1, characterized in that, The third lens group includes at least one cemented lens.

13. The zoom lens according to claim 1, characterized in that, The object-side surface of the first lens in the third lens group, which is closest to the object side, is convex.

14. The zoom lens according to claim 1, characterized in that, The lens closest to the object side in the third lens group is a glass lens.

15. The zoom lens according to claim 1, characterized in that, The fourth lens group includes at least one lens with positive optical power and at least one lens with negative optical power.

16. The zoom lens according to claim 15, characterized in that, The fourth lens group includes at least one plastic lens.

17. The zoom lens according to claim 15, characterized in that, The lens closest to the object side in the fourth lens group has positive optical power.

18. The zoom lens according to claim 15, characterized in that, The lens closest to the image side in the fourth lens group is a plastic lens.

19. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies: 9.86≤TTL / Φ≤11.34, where Φ is the diameter of the imaging surface of the zoom lens.

20. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies: 3.30≤TTL / (d12t-d12w)≤5.49, where d12t is the distance along the optical axis from the image side of the lens closest to the image side in the first lens group to the object side of the lens closest to the object side in the second lens group when the zoom lens is at the telephoto end, and d12w is the distance along the optical axis from the image side of the lens closest to the image side in the first lens group to the object side of the lens closest to the object side in the second lens group when the zoom lens is at the wide-angle end.

21. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies: 5.43≤(d12t-d12w) / (ft / fw)≤6.06, where d12t is the distance along the optical axis from the image side of the lens closest to the image side in the first lens group to the object side of the lens closest to the object side in the second lens group when the zoom lens is at the telephoto end, and d12w is the distance along the optical axis from the image side of the lens closest to the image side in the first lens group to the object side of the lens closest to the object side in the second lens group when the zoom lens is at the wide-angle end.

22. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies the following condition: 2.53≤TTL / f3≤4.52, where f3 is the effective focal length of the third lens group.

23. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies the following condition: 1.40≤f4 / fw≤6.50, where f4 is the effective focal length of the fourth lens group.

24. The zoom lens according to any one of claims 1-18, characterized in that, In the second lens group, at least one plastic lens has an Abbe number VD2i that satisfies: VD2i≥50. In the second lens group, at least one plastic lens has an Abbe number VD2j that satisfies: VD2j≤30. Wherein, VD2i and VD2j are the Abbe numbers of two different plastic lenses in the second lens group.

25. The zoom lens according to any one of claims 1-18, characterized in that, At least one plastic lens in the third lens group has an Abbe number VD3i that satisfies: VD3i≥50. At least one plastic lens in the third lens group has an Abbe number VD3j that satisfies: VD3j≤30. Wherein, VD3i and VD3j are the Abbe numbers of two different plastic lenses in the third lens group.

26. The zoom lens according to any one of claims 1-18, characterized in that, The third lens group comprises two low-dispersion glass lenses, satisfying: 68.62≤VD3a≤81.61 and 1.50≤ND3a≤1.60, where VD3a and ND3a are the Abbe number and refractive index of the low-dispersion glass lens in the third lens group, respectively.

27. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies the following condition: 3.31≤ft / fw≤5.

00.

28. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies the following condition: 0.79≤ft / sd11≤1.22, where sd11 is the effective aperture of the lens closest to the object side in the first lens group.

29. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies: 4.08≤TTL / sd31≤6.24, where sd31 is the effective aperture of the lens closest to the object side in the third lens group.

30. The zoom lens according to any one of claims 1-18, characterized in that, The zoom lens satisfies the following condition: 1.68≤sd31 / fw≤1.89, where sd31 is the effective aperture of the lens closest to the object side in the third lens group.

Images