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 fixed lens group with positive refractive power, a first zoom lens group with negative refractive power, a second fixed lens group with refractive power, a second zoom lens group with positive refractive power, a first focusing lens group with positive refractive power, and a third fixed lens group with refractive power; during zooming from the wide-angle end to the telephoto end, the first zoom lens group moves from the object side to the image side along the optical axis, the second zoom lens group moves from the image side to the object side along the optical axis to zoom, and the first focusing lens group moves along the optical axis to correct the change of the image surface position during zooming; wherein the distance TTL from the object side surface of the lens closest to the object side of the first fixed lens group to the imaging surface and the imaging target surface diameter φ of the zoom lens satisfy 7.2 ≤ TTL / φ ≤ 12.5.

Description

Technical Field

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

[0002] In recent years, with the development of lens and chip technology, users have increasingly demanded lenses with long focal lengths, large apertures, and high resolutions. Zoom lenses can switch between wide-angle and telephoto lenses and capture clear images.

[0003] However, currently used zoom lenses generally have the following shortcomings: small aperture, which cannot meet the brightness requirements of images in low-light environments; low resolution, with the current mainstream high-definition lenses having a resolution of 4 megapixels, which is no longer sufficient to meet the demand for high pixels; an inability to balance large image size with small volume, failing to meet the space requirements of the lens; large distortion, with distortion occurring around the edges of the captured image; and the lack of thermal optical correction, which has a significant impact on performance at different operating temperatures, resulting in focus drift issues in high and low temperature environments. Summary of the Invention

[0004] According to an embodiment of this application, a zoom lens is provided, comprising, in sequence along the optical axis from the object side to the image side: a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with optical power, a second zoom lens group with positive optical power, a first focusing lens group with positive optical power, and a third fixed lens group with optical power; during the zoom process from wide-angle to telephoto, the first zoom lens group moves along the optical axis from the object side to the image side, the second zoom lens group moves along the optical axis from the image side to the object side to perform zoom, and the first focusing lens group moves along the optical axis to correct the change in image plane position during the zoom process; and during the zoom process, the distance from the object side surface of the lens closest to the object side in the first fixed lens group to the imaging plane remains unchanged; wherein, the distance TTL from the object side surface of the lens closest to the object side in the first fixed lens group to the imaging plane and the diameter of the imaging target surface of the zoom lens are... satisfy:

[0005]

[0006] In one or more embodiments, the second zoom lens group includes at least six lenses, including at least four lenses with positive optical power and two lenses with negative optical power; and the lens of the second zoom lens group closest to the object side has positive optical power.

[0007] In one or more embodiments, the second zoom lens group includes at least two cemented lenses, one of which is a cemented triplet lens; and the image-side surface of the lens closest to the image side of the second zoom lens group is concave.

[0008] In one or more embodiments, the first fixed lens group includes at least three lenses with positive optical power and at least one lens with negative optical power, and the lens closest to the image side of the first fixed lens group has positive optical power.

[0009] In one or more embodiments, the first fixed lens group includes at least one cemented lens, and the object side of the lens closest to the object side of the first fixed lens group is convex.

[0010] In one or more embodiments, the first zoom lens group includes three lenses with negative optical power and two lenses with positive optical power, and the lens closest to the object side of the first zoom lens group has negative optical power.

[0011] In one or more embodiments, the first zoom lens group includes at least one cemented lens, and the image-side surface of the lens closest to the image side of the first zoom lens group is concave.

[0012] In one or more embodiments, the first focusing lens group includes two lenses with positive optical power and two lenses with negative optical power, and the lens closest to the image side of the first focusing lens group has positive optical power.

[0013] In one or more embodiments, the first focusing lens group includes at least one cemented lens, and the image side of the lens closest to the image side of the first focusing lens group is convex.

[0014] In one or more embodiments, the second fixed lens group includes a lens with positive optical power and a lens with negative optical power, and the lens closest to the image side of the second fixed lens group has positive optical power and a convex object side.

[0015] In one or more embodiments, the third fixed lens group includes at least one lens with positive optical power and at least one lens with negative optical power, and the lens closest to the image side of the third fixed lens group has negative optical power and a concave object side.

[0016] In one or more embodiments, the focal length fw of the zoom lens at the wide-angle end and the focal length ft of the zoom lens at the telephoto end satisfy: 16.5mm≤(ft-fw) / (ft / fw)≤44.0mm.

[0017] In one or more embodiments, the distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane, the focal length fw of the zoom lens at the wide-angle end, and the focal length ft of the zoom lens at the telephoto end satisfy: 0.5≤TTL / (ft-fw)≤2.3.

[0018] In one or more embodiments, the distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane, the distance d12t from the image side of the lens closest to the image side of the first fixed lens group to the object side of the lens closest to the object side of the first zoom lens group when the zoom lens is at the telephoto end, the distance d12w from the image side of the lens closest to the image side of the first fixed lens group to the object side of the lens closest to the object side of the first zoom lens group when the zoom lens is at the wide-angle end, the distance d45t from the image side of the lens closest to the image side of the second zoom lens group to the object side of the lens closest to the object side of the first focusing lens group when the zoom lens is at the telephoto end, and the distance d45w from the image side of the lens closest to the image side of the second zoom lens group to the object side of the lens closest to the object side of the first focusing lens group when the zoom lens is at the wide-angle end satisfy: 1.6≤TTL / [(d12t-d12w)+(d45t-d45w)]≤3.3.

[0019] In one or more embodiments, the distance d34t between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the telephoto end, the distance d34w between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the wide-angle end, the focal length fw of the zoom lens at the wide-angle end, and the focal length ft of the zoom lens at the telephoto end satisfy: 2.5mm≤(d34t-d34w) / (ft / fw)≤7.2mm.

[0020] In one or more embodiments, the focal length fw of the zoom lens at the wide-angle end, the focal length ft of the zoom lens at the telephoto end, and the diameter of the imaging target surface of the zoom lens are... satisfy:

[0021] In one or more embodiments, the focal length fw of the zoom lens at the wide-angle end and the focal length f4 of the second zoom lens group satisfy: 0.9≤f4 / fw≤2.8.

[0022] In one or more embodiments, the focal length ft of the zoom lens at the telephoto end and the focal length f2 of the first zoom lens group satisfy: -9.8≤ft / f2≤-2.9.

[0023] In one or more embodiments, the focal length ft of the zoom lens at the telephoto end, the focal length fw of the zoom lens at the wide-angle end, and the focal length f5 of the first focusing lens group satisfy: 0.4≤(ft-fw) / f5≤4.6.

[0024] In one or more embodiments, the distance d12t between the image side of the lens closest to the image side of the first fixed lens group and the object side of the lens closest to the object side of the first zoom lens group when the zoom lens is at the telephoto end, the distance d12w between the image side of the lens closest to the image side of the first fixed lens group and the object side of the lens closest to the object side of the first zoom lens group when the zoom lens is at the wide-angle end, the distance d34w between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the wide-angle end, and the distance d34t between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the telephoto end, satisfy: 0.8≤(d12t-d12w) / (d34w-d34t)≤3.1.

[0025] In one or more embodiments, the distance d34w between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the wide-angle end, the distance d34t between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the telephoto end, the distance d56w between the image side of the lens closest to the image side of the first focusing lens group and the object side of the lens closest to the object side of the third fixed lens group when the zoom lens is at the wide-angle end, and the distance d56t between the image side of the lens closest to the image side of the first focusing lens group and the object side of the lens closest to the object side of the third fixed lens group when the zoom lens is at the telephoto end, satisfy: 0≤(d34w-d34t) / (d56w-d56t)≤17.2.

[0026] In one or more embodiments, the focal length ft of the zoom lens at the telephoto end, the focal length fw of the zoom lens at the wide-angle end, the distance d45t between the image side of the lens closest to the image side of the second zoom lens group and the object side of the lens closest to the object side of the first focusing lens group when the zoom lens is at the telephoto end, and the distance d45w between the image side of the lens closest to the image side of the second zoom lens group and the object side of the lens closest to the object side of the first focusing lens group when the zoom lens is at the wide-angle end, satisfy: 2.9≤(ft-fw) / (d45t-d45w)≤5.4.

[0027] In one or more embodiments, the distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane satisfies the following condition: -7.1≤TTL / f2≤-4.6.

[0028] In one or more embodiments, the distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane and the focal length f4 of the second zoom lens group satisfy: 2.1≤TTL / f4≤4.8.

[0029] In one or more embodiments, the focal length f1 of the first fixed lens group and the focal length f2 of the first zoom lens group satisfy: -4≤f1 / f2≤-2.3.

[0030] In one or more embodiments, the Abbe number Vd of at least one lens with positive optical power in the first fixed lens group m and refractive index Nd m They respectively satisfy: 15≤Vd m ≤40; 1.75≤Nd m ≤2.1, where m is a positive integer.

[0031] In one or more embodiments, the Abbe number Vd of at least one lens with positive optical power in the second zoom lens group n and refractive index Nd n They respectively satisfy: 15≤Vd n ≤40; 1.75≤Nd n ≤2.1, where n is a positive integer.

[0032] According to the embodiments of this application, a zoom lens with a large target area, long focal length, high magnification, and resolution of 8k or higher is provided. By reasonably setting the positions and optical power distribution of the fixed lens group, zoom lens group, and focusing lens group, it is beneficial to achieve efficient zoom with high magnification and high-quality resolution across the entire focal length while ensuring low tolerance sensitivity of each lens group.

[0033] The zoom lens provided according to the embodiments of this application has good aberration correction capability based on a wide range of variable focal length and aperture. It can ensure clear focus from an object distance of 1m to infinity throughout the zoom range. While meeting the requirements of low distortion with an absolute value of less than 5% and a large aperture of 2.0 at the telephoto end, it can achieve high resolution of 8K or more and a large target surface with a full image height of 25.56mm or more. Attached Figure Description

[0034] 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:

[0035] Figure 1A and Figure 1B The diagrams show the structure of the zoom lens according to Embodiment 1 of this application at the wide-angle end and the telephoto end when the object distance is infinity;

[0036] Figure 1C , Figure 1D and Figure 1E The magnification chromatic aberration, positional chromatic aberration, and distortion diagrams at the wide-angle end of the zoom lens in Embodiment 1 of this application are shown respectively.

[0037] Figure 1F , Figure 1G and Figure 1H The magnification chromatic aberration, positional chromatic aberration, and distortion at the telephoto end of the zoom lens in Embodiment 1 of this application are shown respectively.

[0038] Figure 2A and Figure 2B The diagrams show the structure of the zoom lens at the wide-angle end and the telephoto end when the object distance is infinity according to Embodiment 2 of this application.

[0039] Figure 2C , Figure 2D and Figure 2E The magnification chromatic aberration, positional chromatic aberration, and distortion at the wide-angle end of the zoom lens in Embodiment 2 of this application are shown respectively.

[0040] Figure 2F , Figure 2G and Figure 2H The magnification chromatic aberration, positional chromatic aberration, and distortion at the telephoto end of the zoom lens in Embodiment 2 of this application are shown respectively.

[0041] Figure 3A and Figure 3B The diagrams show the structure of the zoom lens according to Embodiment 3 of this application at the wide-angle end and the telephoto end when the object distance is infinity;

[0042] Figure 3C , Figure 3D and Figure 3E The magnification chromatic aberration, positional chromatic aberration, and distortion diagrams at the wide-angle end of the zoom lens in Embodiment 3 of this application are shown respectively.

[0043] Figure 3F , Figure 3G and Figure 3H The magnification chromatic aberration, positional chromatic aberration, and distortion at the telephoto end of the zoom lens in Embodiment 3 of this application are shown respectively.

[0044] Figure 4A and Figure 4B The diagrams show the structure of the zoom lens at the wide-angle end and the telephoto end when the object distance is infinity according to Embodiment 4 of this application.

[0045] Figure 4C , Figure 4D and Figure 4E The following diagrams respectively illustrate the magnification chromatic aberration, positional chromatic aberration, and distortion at the wide-angle end of the zoom lens in Embodiment 4 of this application when the object distance is infinity; and

[0046] Figure 4F , Figure 4G and Figure 4HThe diagrams show the magnification chromatic aberration, positional chromatic aberration, and distortion at the telephoto end when the object distance of the zoom lens is at infinity in Embodiment 4 of this application. Detailed Implementation

[0047] 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.

[0048] 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 first lens.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

[0054] The features, principles and other aspects of this application are described in detail below.

[0055] refer to Figure 1A and Figure 1B As shown, a zoom lens according to an exemplary embodiment of this application may include a first fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, a second fixed lens group G3 with positive or negative optical power, a second zoom lens group G4 with positive optical power, a first focusing lens group G5 with positive optical power, and a third fixed lens group G6 with positive or negative optical power, arranged sequentially along the optical axis from the object side to the image side.

[0056] In an exemplary embodiment, each lens group of the zoom lens may include multiple lenses, wherein the number N of lenses included in each lens group satisfies: 2≤N≤7, where N is a positive integer.

[0057] In an exemplary embodiment, the zoom lens from Figure 1A The wide-angle end (W) shown Figure 1B During the zoom process at the telephoto end (T), the first zoom lens group G2 can move along the optical axis from the object side to the image side, and the second zoom lens group G4 can move along the optical axis from the image side to the object side, thereby achieving zoom from the wide-angle end to the telephoto end. Meanwhile, the first focusing lens group G5 can move back and forth along the optical axis to correct changes in the image plane position during zooming, achieving continuous sharp focusing on the zoom lens. During zooming, the positions of the first fixed lens group G1, the second fixed lens group G3, and the third fixed lens group G6 on the optical axis remain unchanged. For example, the distance from the object side of the lens closest to the object side in the first fixed lens group G1 to the image plane Image remains constant.

[0058] According to the zoom lens of the above-described embodiments of this application, by rationally setting the distribution positions of each lens group and the optical power allocation method, it is beneficial to achieve efficient zoom at high magnification and excellent resolution across the entire focal length while ensuring low tolerance sensitivity of each lens group. Focusing is achieved by adjusting the first zoom lens group G2 and the second zoom lens group G4, while simultaneously compensating for changes in the image plane position by moving the first focusing lens group G5 along the axial direction. This ensures that images formed at different object distances can be adjusted onto the imaging plane, guaranteeing clear focus throughout the zoom range from 1m to infinity, and improving zoom efficiency and image quality.

[0059] In an exemplary embodiment, the zoom lens satisfies the following condition: Where TTL is the distance from the object side of the lens closest to the object side of the first fixed lens group G1 of the zoom lens to the image plane. This is the diameter of the imaging target surface of the zoom lens. If it is smaller than this lower limit, aberration balance at the telephoto end is limited, making it difficult to improve resolution. If it is larger than this upper limit, the lens size increases, zoom efficiency decreases, and cost increases.

[0060] In an exemplary embodiment, the second zoom lens group G4 includes at least six lenses, including at least four lenses with positive optical power and two lenses with negative optical power; and the lens closest to the object side in the second zoom lens group G4 has positive optical power. The lens arrangement in the second zoom lens group G4 of the zoom lens is advantageous for correcting lens aberrations and chromatic aberrations, resulting in smooth light path and low lens tolerance sensitivity.

[0061] In an exemplary embodiment, the second zoom lens group G4 includes at least two cemented lenses, one of which is a cemented triplet lens; the image-side surface of the lens closest to the image side of the second zoom lens group G4 is concave. The lens arrangement described above in the second zoom lens group G4 of the zoom lens is beneficial for correcting lens aberrations and chromatic aberrations, and also helps to reduce the group sensitivity of the second zoom lens group G4.

[0062] In an exemplary embodiment, the first fixed lens group G1 includes at least three lenses with positive optical power and at least one lens with negative optical power, and the lens closest to the image side of the first fixed lens group G1 has positive optical power. The lens allocation method described above in the first fixed lens group G1 of the zoom lens is beneficial for reducing the front aperture of the zoom lens and for chromatic aberration correction at the telephoto end of the lens.

[0063] In an exemplary embodiment, the first fixed lens group G1 includes at least one cemented lens, and the object-side surface of the lens closest to the object side of the first fixed lens group G1 is convex. The lens arrangement described above in the first fixed lens group G1 of the zoom lens is beneficial for chromatic aberration correction at the telephoto end of the lens and also helps to reduce the front diameter of the lens, thus lowering costs.

[0064] In an exemplary embodiment, the first zoom lens group G2 includes three lenses with negative optical power and two lenses with positive optical power, and the lens closest to the object side in the first zoom lens group G2 has negative optical power. The first zoom lens group G2 of the zoom lens employs the above-described lens allocation method, which is beneficial for improving the lens zoom efficiency and for correcting lens aberrations.

[0065] In an exemplary embodiment, the first zoom lens group G2 includes at least one cemented lens, and the image-side surface of the lens closest to the image side of the first zoom lens group G2 is concave. The lens arrangement described above in the first zoom lens group G2 of the zoom lens is beneficial for lens aberration correction and also helps to reduce the group tolerance sensitivity of the second lens group G2.

[0066] In an exemplary embodiment, the first focusing lens group G5 includes two lenses with positive optical power and two lenses with negative optical power, and the lens closest to the image side of the first focusing lens group G5 has positive optical power. The lens allocation method described above in the first focusing lens group G5 of the zoom lens is beneficial for improving the zoom efficiency and focusing efficiency of the lens, and enhancing the overall resolution.

[0067] In an exemplary embodiment, the first focusing lens group G5 includes at least one cemented lens, and the image-side surface of the lens closest to the image side of the first focusing lens group G5 is convex. The lens arrangement described above in the first focusing lens group G5 of the zoom lens is beneficial for aberration correction and helps reduce the group tolerance sensitivity of the lens group.

[0068] In an exemplary embodiment, the second fixed lens group G3 includes a lens with positive optical power and a lens with negative optical power, and the lens closest to the image side of the second fixed lens group G3 has positive optical power and a convex object side. The third lens group G3 adopts the above-described lens allocation method, adjusting the light angle at the center position of the lens, which is beneficial to improving the lens resolution and reducing the overall tolerance sensitivity of the lens.

[0069] In an exemplary embodiment, an aperture stop (STOP) is provided between the first zoom lens group G2 and the second fixed lens group G3.

[0070] In an exemplary embodiment, the third fixed lens group G6 includes at least one lens with positive optical power and at least one lens with negative optical power, and the lens closest to the image side of the third fixed lens group G6 has negative optical power and a concave object side. The lens arrangement described above in the third fixed lens group G6 of the zoom lens facilitates large-area imaging and improves lens distortion and CRA correction.

[0071] In an exemplary embodiment, the zoom lens satisfies the following condition: 16.5mm ≤ (ft-fw) / (ft / fw) ≤ 44.0mm. Here, fw is the focal length of the zoom lens at the wide-angle end, and ft is the focal length of the zoom lens at the telephoto end. If the focal length is less than this lower limit, the telephoto end of the lens is too short, making it difficult to achieve super-telephoto functionality and hindering the miniaturization of the lens's front end, thus making cost control difficult. If the focal length is greater than this upper limit, chromatic aberration across the entire focal length is difficult to correct, the lens's resolution decreases, and the overall length of the lens is difficult to compress, which is detrimental to the lens's portability and low cost.

[0072] In an exemplary embodiment, the zoom lens satisfies the following condition: 0.5 ≤ TTL / (ft-fw) ≤ 2.3. Where TTL is the distance from the object side of the lens closest to the object side of the first fixed lens group G1 of the zoom lens to the image plane, fw is the focal length of the zoom lens at the wide-angle end, and ft is the focal length of the zoom lens at the telephoto end. If the value is less than this lower limit, lens aberrations are difficult to correct, and lens resolution decreases; if the value is greater than this upper limit, it will lead to an increase in lens size and design cost.

[0073] In an exemplary embodiment, the zoom lens satisfies the following condition: 1.6≤TTL / [(d12t-d12w)+(d45t-d45w)]≤3.3. Where TTL is the distance from the object side of the lens closest to the object side of the first fixed lens group G1 of the zoom lens to the image plane, d12t is the distance from the image side of the lens closest to the image side of the first fixed lens group G1 to the object side of the lens closest to the object side of the first zoom lens group G2 when the zoom lens is at the telephoto end, d12w is the distance from the image side of the lens closest to the image side of the first fixed lens group G1 to the object side of the lens closest to the object side of the first zoom lens group G2 when the zoom lens is at the wide-angle end, d45t is the distance from the image side of the lens closest to the image side of the second zoom lens group G4 to the object side of the lens closest to the object side of the first focusing lens group G5 when the zoom lens is at the telephoto end, and d45w is the distance from the image side of the lens closest to the image side of the second zoom lens group G4 to the object side of the lens closest to the object side of the first focusing lens group G5 when the zoom lens is at the wide-angle end. If the value is less than the lower limit, it will result in an increase in lens size, increased design cost, and low zoom efficiency; if the value is greater than the upper limit, it will increase the aberration between the first zoom lens group G2 and the second zoom lens group G4, decrease the lens's resolving power, and worsen the group tolerance sensitivity.

[0074] In an exemplary embodiment, the zoom lens satisfies the following condition: 2.5mm ≤ (d34t - d34w) / (ft / fw) ≤ 7.2mm. Where d34t is the distance from the image-side surface of the lens closest to the image side of the second fixed lens group G3 to the object-side surface of the lens closest to the object side of the second zoom lens group G4 at the telephoto end; d34w is the distance from the image-side surface of the lens closest to the image side of the second fixed lens group G3 to the object-side surface of the lens closest to the object side of the second zoom lens group G4 at the wide-angle end; fw is the focal length of the zoom lens at the wide-angle end; and ft is the focal length of the zoom lens at the telephoto end. If the value exceeds this upper limit, the lens size increases, design costs increase, and zoom efficiency decreases; if the value is less than this lower limit, the lens cannot simultaneously achieve both telephoto and wide-angle performance, resolution decreases, and tolerance sensitivity deteriorates.

[0075] In an exemplary embodiment, the zoom lens satisfies the following condition: Where fw is the focal length of the zoom lens at the wide-angle end, and ft is the focal length of the zoom lens at the telephoto end. This is the diameter of the imaging target surface of the zoom lens. If it is smaller than this lower limit, aberration balance at the telephoto end is limited, resolving power is difficult to improve, and the lens size will increase. If it is larger than this upper limit, the lens cannot achieve the function of an ultra-large target surface, and the lens resolution will decrease.

[0076] In an exemplary embodiment, the zoom lens satisfies the following condition: 0.9 ≤ f4 / fw ≤ 2.8. Here, fw is the focal length of the zoom lens at the wide-angle end, and f4 is the focal length of the second zoom lens group G4. If the value is less than this lower limit, the tolerance sensitivity of the second zoom lens group deteriorates, resulting in poor resolution consistency in the product. If the value is greater than this upper limit, the size (length) of the lens increases, which is detrimental to meeting the requirements of portability and cost.

[0077] In an exemplary embodiment, the zoom lens satisfies the following condition: -9.8 ≤ ft / f2 ≤ -2.9. Where ft is the focal length of the zoom lens at the telephoto end, and f2 is the focal length of the first zoom lens group G2. If the value is less than this lower limit, the resolution at the telephoto end of the lens is difficult to improve, and the size (length) of the lens increases, which is detrimental to the lens's portability and cost. If the value is greater than this upper limit, the tolerance sensitivity of the first zoom lens group deteriorates, resulting in poor product resolution consistency.

[0078] In an exemplary embodiment, the zoom lens satisfies the following condition: 0.4 ≤ (ft - fw) / f5 ≤ 4.6. Where ft is the focal length of the zoom lens at the telephoto end, fw is the focal length of the zoom lens at the wide-angle end, and f5 is the focal length of the first focusing lens group G5. If the value is less than this lower limit, it is difficult to increase the lens magnification, and the tolerance sensitivity of the lens group deteriorates. If the value is greater than this upper limit, the lens zoom efficiency is low, and the lens size increases, which is detrimental to the lens's portability and cost.

[0079] In an exemplary embodiment, the zoom lens satisfies the following condition: 0.8 ≤ (d12t - d12w) / (d34w - d34t) ≤ 3.1. Wherein, d12t is the distance from the image-side surface of the lens closest to the image side of the first fixed lens group G1 to the object-side surface of the lens closest to the object side of the first zoom lens group G2 when the zoom lens is at the telephoto end; d12w is the distance from the image-side surface of the lens closest to the image side of the first fixed lens group G1 to the object-side surface of the lens closest to the object side of the first zoom lens group G2 when the zoom lens is at the wide-angle end; d34w is the distance from the image-side surface of the lens closest to the image side of the second fixed lens group G3 to the object-side surface of the lens closest to the object side of the second zoom lens group G4 when the zoom lens is at the wide-angle end; and d34t is the distance from the image-side surface of the lens closest to the image side of the second fixed lens group G3 to the object-side surface of the lens closest to the object side of the second zoom lens group G4 when the zoom lens is at the telephoto end. If the sensitivity is less than the lower limit, the sensitivity of the second zoom lens group G4 decreases; if the sensitivity is greater than the upper limit, the sensitivity of the first zoom lens group G2 decreases. If this expression is satisfied, the lens has a high zoom efficiency and a relatively uniform distribution of sensitivity among the lens groups.

[0080] In an exemplary embodiment, the zoom lens satisfies the following condition: 0 ≤ (d34w - d34t) / (d56w - d56t) ≤ 17.2. Wherein, d34w is the distance from the image-side surface of the lens closest to the image side of the second fixed lens group G3 to the object-side surface of the lens closest to the object side of the second zoom lens group G4 when the zoom lens is at the wide-angle end; d34t is the distance from the image-side surface of the lens closest to the image side of the second fixed lens group G3 to the object-side surface of the lens closest to the object side of the second zoom lens group G4 when the zoom lens is at the telephoto end; d56w is the distance from the image-side surface of the lens closest to the image side of the first focusing lens group G5 to the object-side surface of the lens closest to the object side of the third fixed lens group G6 when the zoom lens is at the wide-angle end; and d56t is the distance from the image-side surface of the lens closest to the image side of the first focusing lens group G5 to the object-side surface of the lens closest to the object side of the third fixed lens group G6 when the zoom lens is at the telephoto end. If the sensitivity is below the lower limit, the sensitivity of the second zoom lens group G4 decreases. If the sensitivity is above the upper limit, the sensitivity of the first focusing lens group G5 decreases, and the focusing accuracy of the lens drops.

[0081] In an exemplary embodiment, the zoom lens satisfies the following condition: 2.9 ≤ (ft - fw) / (d45t - d45w) ≤ 5.4. Where ft is the focal length of the zoom lens at the telephoto end, fw is the focal length of the zoom lens at the wide-angle end, d45t is the distance from the image-side surface of the lens closest to the image side of the second zoom lens group G4 to the object-side surface of the lens closest to the object side of the first focusing lens group G5 when the zoom lens is at the telephoto end, and d45w is the distance from the image-side surface of the lens closest to the image side of the second zoom lens group G4 to the object-side surface of the lens closest to the object side of the first focusing lens group G5 when the zoom lens is at the wide-angle end. If the value is less than this lower limit, the overall sensitivity of the lens deteriorates, and resolution across the entire focal length is difficult to achieve. If the value is greater than this upper limit, the zoom efficiency of the lens is low, and the lens size increases, which is detrimental to cost control.

[0082] In an exemplary embodiment, the zoom lens satisfies the following condition: -7.1 ≤ TTL / f2 ≤ -4.6. Where TTL is the distance from the object side of the lens closest to the object side of the first fixed lens group G1 to the image plane, and f2 is the focal length of the first zoom lens group G2. If the value is less than this lower limit, the sensitivity of the first zoom lens group G2 decreases. If the value is greater than this upper limit, the zoom efficiency of the lens is low, and the lens size increases.

[0083] In an exemplary embodiment, the zoom lens satisfies the following condition: 2.1 ≤ TTL / f4 ≤ 4.8. Where TTL is the distance from the object-side surface of the lens closest to the object side of the first fixed lens group G1 to the image plane, and f4 is the focal length of the second zoom lens group G4. If the value is less than the lower limit, the sensitivity of the second zoom lens group G4 decreases. If the value is greater than the upper limit, the zoom efficiency of the lens is low, and the lens size increases.

[0084] In an exemplary embodiment, the zoom lens satisfies the following condition: -4 ≤ f1 / f2 ≤ -2.3. Here, f1 is the focal length of the first fixed lens group G1, and f2 is the focal length of the first zoom lens group G2. If the value is less than this lower limit, the zoom efficiency of the lens is low. If the value is greater than this upper limit, it is difficult to improve the resolution at the telephoto end of the lens, and the lens size (aperture) increases.

[0085] In an exemplary embodiment, the Abbe number Vd of at least one lens with positive optical power in the first fixed lens group G1 of the zoom lens m The refractive index Ndm satisfies: 15 ≤ Vd m ≤40; 1.75≤Nd m ≤2.1, where m is a positive integer. Satisfying the above conditions can effectively reduce field curvature and astigmatism caused by large incident angle light rays at the wide-angle end, comprehensively improve the resolution at the wide-angle end, and play a key role in solving the problem of inconsistent focus between the wide-angle end and the telephoto end under high and low temperatures.

[0086] In an exemplary embodiment, the Abbe number Vd of at least one lens with positive optical power in the second zoom lens group G4 of the zoom lens... n and refractive index Nd n They respectively satisfy: 15≤Vd n ≤40; 1.75≤Nd n ≤2.1, where n is a positive integer. Satisfying the above conditions is beneficial for optimizing light path, reducing the group tolerance sensitivity of the second zoom lens group G4, reducing the weight of the group, improving the reliability of group operation, and playing a key role in solving the problem of inconsistent high and low temperature focus and normal temperature focus of the lens.

[0087] In an exemplary embodiment, the zoom lens may adopt an all-glass spherical lens structure, with a reasonable distribution of aberrant dispersion glass and high refractive index glass, to ensure high-quality imaging while reducing manufacturing difficulty and improving lens manufacturability.

[0088] The zoom lens according to the above embodiments of this application has excellent resolving power, with a resolution of 8K or higher.

[0089] The zoom lens according to the embodiments of this application adopts a three-motion group structure that combines two zoom lens groups and one focusing lens group, which can improve zoom efficiency, shorten the total length of the lens, reduce the lens volume, achieve a zoom efficiency of up to 8.7 times, compress the total length of the lens to a minimum of 205mm, and compress the lens diameter to a minimum of 100mm.

[0090] The zoom lens according to the embodiments of this application has an imaging target diameter of more than 40mm, and when paired with an ultra-large target sensor, it can provide ultra-high resolution resolution.

[0091] The zoom lens according to the embodiments of this application can achieve super telephoto function, with a focal length of up to 394mm at the telephoto end, and can capture high-definition details of objects at extremely far distances.

[0092] The zoom lens according to the embodiments of this application achieves low distortion throughout the zoom process, with the absolute value of distortion reaching as low as 1.5%, ensuring minimal distortion in the captured image.

[0093] The zoom lens according to the embodiments of this application has a wide focusing distance range, and can ensure clear focus from 1m to infinity throughout the zoom range, resulting in good imaging effect.

[0094] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the zoom lens applicable to the above-described embodiments.

[0095] Example 1

[0096] The following is for reference Figures 1A to 1H A zoom lens according to Embodiment 1 of this application is described.

[0097] like Figure 1A and Figure 1B As shown, in this embodiment, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop (STOP), a second fixed lens group G3 with positive optical power, a second zoom lens group G4 with positive optical power, a first focusing lens group G5 with positive optical power, and a third fixed lens group G6 with negative optical power. Light incident from the object side passes sequentially through the lens surfaces of each lens group and is finally imaged onto the imaging plane Image.

[0098] Among them, the first zoom lens group G2 and the second zoom lens group G4 can move along the optical axis to perform optical zoom between the wide-angle end and the telephoto end of the zoom lens, and the first focusing lens group G5 can also move along the optical axis to correct the change in the image plane position of the zoom lens during the zoom process.

[0099] In the descriptions of this embodiment and the following embodiments, each optical surface of the lens is referred to as a surface (surf), the aperture stop is referred to as a surface, and the cemented surface of the cemented lens is referred to as a surface. For example, a cemented doublet lens composed of two cemented lenses has three surfaces.

[0100] In this embodiment, the zoom lens includes 26 lenses with optical power. Along the optical axis from the object side to the image side, the first fixed lens group G1 includes five lenses L1 to L5, including one cemented triplet lens L3 to L5, and the object-side surface surf1 of the lens L1 closest to the object side in the first fixed lens group G1 is convex; the first zoom lens group G2 includes five lenses L6 to L10, including one cemented triplet lens L7 to L9, and the image-side surface surf16 of the lens L10 closest to the image side in the first zoom lens group G2 is concave; the second fixed lens group G3 includes two lenses L11 and L12, and the optical power of the lens L11 closest to the object side in the second fixed lens group G3 is positive, and the object-side surface surf18 is convex; the second zoom lens... Lens group G4 includes seven lenses L13 to L19, including one cemented triplet lens L15 to L17 and one cemented doublet lens L18 to L19. The image-side surface (surf32) of lens L19, which is closest to the image side of the second zoom lens group G4, is concave. The first focusing lens group G5 includes four lenses L20 to L23, including one cemented doublet lens L20 to L21. The image-side surface (surf39) of lens L23, which is closest to the image side of the first focusing lens group G5, is convex. The third fixed lens group G6 includes three lenses L24 to L26, including one positive lens L25 and two negative lenses L24 and L26. The image-side surface (surf44) of lens L26, which is closest to the image side of the third fixed lens group G6, is a negative lens.

[0101] In this embodiment, the zoom lens from Figure 1A The wide-angle end shown Figure 1B During the zoom process at the telephoto end, the first zoom lens group G2 moves along the optical axis from the object side to the image side, and the second zoom lens group G4 moves along the optical axis from the image side to the object side to perform zoom. Simultaneously, the first focusing lens group G5 moves along the optical axis to correct for changes in the image plane position during zoom. During zoom, the positions of the first fixed lens group G1, the second fixed lens group G3, and the third fixed lens group G6 remain fixed.

[0102] In this embodiment, the distance TTL from the object side surface surf1 of the lens L1 closest to the object side of the first fixed lens group G1 of the zoom lens to the image plane Image is 244.635mm; the aperture coefficient FNO (WIDE) at the wide-angle end is 2.16; the focal length fw at the wide-angle end is 45.000mm; and the focal length ft at the telephoto end is 250.000mm.

[0103] Table 1 shows some basic parameters of each lens in the zoom lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0104]

[0105]

[0106] Table 1

[0107] In the first fixed lens group G1, the refractive index Nd2 and Abbe number Vd2 of a positive lens L2 are Nd2 = 1.95 and Vd2 = 18.0, respectively; the refractive index Nd2 of a positive lens L19 in the second zoom lens group G4 is... 19 And Abbe number Vd 19 They are: Nd 19 =1.95, Vd 19 =18.0.

[0108] The zoom range data for the zoom lens in this embodiment at the wide-angle and telephoto ends are shown in Table 2 below.

[0109]

[0110]

[0111] Table 2

[0112] Figure 1C , Figure 1D and Figure 1E The magnification chromatic aberration, position chromatic aberration, and distortion at the wide-angle end in Example 1 when the object distance is infinitely far are shown respectively. Figure 1F , Figure 1G and Figure 1H The following diagrams show the chromatic aberration at magnification, positional chromatic aberration, and distortion at the focal length when the object distance is at infinity in Example 1. The chromatic aberration diagrams at magnification and positional chromatic aberration are shown below the D-line, C-line, and F-line, respectively. According to... Figures 1C to 1H As can be seen, the zoom lens given in Example 1 has good aberration correction capability, can achieve good image quality, and can achieve low distortion.

[0113] Example 2

[0114] The following is for reference Figures 2A to 2H This application describes a zoom lens according to Embodiment 2. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in Embodiment 2 and the following embodiments.

[0115] like Figure 2A and Figure 2BAs shown, in this embodiment, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop (STOP), a second fixed lens group G3 with positive optical power, a second zoom lens group G4 with positive optical power, a first focusing lens group G5 with positive optical power, and a third fixed lens group G6 with negative optical power. Light incident from the object side passes sequentially through the lens surfaces of each lens group and is finally imaged onto the imaging plane Image.

[0116] Among them, the first zoom lens group G2 and the second zoom lens group G4 can move along the optical axis to perform optical zoom between the wide-angle end and the telephoto end of the zoom lens, and the first focusing lens group G5 can also move along the optical axis to correct the change in the image plane position of the zoom lens during the zoom process.

[0117] In this embodiment, the zoom lens includes 25 lenses with optical power. Along the optical axis from the object side to the image side, the first fixed lens group G1 includes five lenses L1 to L5, including one cemented triplet lens L3 to L5, and the object-side surface surf1 of the lens L1 closest to the object side in the first fixed lens group G1 is convex; the first zoom lens group G2 includes five lenses L6 to L10, including one cemented triplet lens L7 to L9, and the image-side surface surf16 of the lens L10 closest to the image side in the first zoom lens group G2 is concave; the second fixed lens group G3 includes two lenses L11 and L12, and the optical power of the lens L11 closest to the object side in the second fixed lens group G3 is positive, and the object-side surface surf18 is convex; the second zoom lens... Lens group G4 includes six lenses L13 to L18, including one cemented triplet lens L14 to L16 and one cemented doublet lens L17 to L18. The image-side surface (surf30) of lens L18, which is closest to the image side of the second zoom lens group G4, is concave. The first focusing lens group G5 includes four lenses L19 to L22, including one cemented doublet lens L19 to L20. The image-side surface (surf37) of lens L22, which is closest to the image side of the first focusing lens group G5, is convex. The third fixed lens group G6 includes three lenses L23 to L25, including one positive lens L24 and two negative lenses L23 and L25. The image-side surface (surf42) of lens L25, which is closest to the image side of the third fixed lens group G6, is a negative lens.

[0118] In this embodiment, the zoom lens from Figure 2A The wide-angle end shown Figure 2BDuring the zoom process at the telephoto end, the first zoom lens group G2 moves along the optical axis from the object side to the image side, and the second zoom lens group G4 moves along the optical axis from the image side to the object side to perform zoom. Simultaneously, the first focusing lens group G5 moves along the optical axis to correct for changes in the image plane position during zoom. During zoom, the positions of the first fixed lens group G1, the second fixed lens group G3, and the third fixed lens group G6 remain fixed.

[0119] In this embodiment, the distance TTL from the object side surface surf1 of the lens L1 closest to the object side of the first fixed lens group G1 of the zoom lens to the image plane Image is 299.636mm; the aperture coefficient FNO (WIDE) at the wide-angle end is 2.00; the focal length fw at the wide-angle end is 38.125mm; and the focal length ft at the telephoto end is 190.623mm.

[0120] Table 3 shows some basic parameters of each lens in the zoom lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0121]

[0122]

[0123] Table 3

[0124] In the first fixed lens group G1, the refractive index Nd2 and Abbe number Vd2 of a positive lens L2 are Nd2 = 1.95 and Vd2 = 18.0, respectively; the refractive index Nd2 of a positive lens L18 in the second zoom lens group G4 is... 18 And Abbe number Vd 18 They are: Nd 18 =1.95, Vd 18 =18.0.

[0125] The zoom range data for the zoom lens in this embodiment at the wide-angle and telephoto ends are shown in Table 4 below.

[0126] thickness Wide-angle end telephoto end surf8 3.495 70.011 surf16 82.186 15.670 surf21 33.826 5.144 surf30 4.403 39.582 surf37 16.552 10.056

[0127] Table 4

[0128] Figure 2C , Figure 2D and Figure 2E The magnification chromatic aberration, position chromatic aberration, and distortion at the wide-angle end in Example 2 when the object distance is infinitely far are shown respectively. Figure 2F , Figure 2G and Figure 2HThe following diagrams show the chromatic aberration at magnification, positional chromatic aberration, and distortion at the focal length when the object distance is at infinity in Example 2. The chromatic aberration diagrams at magnification and positional chromatic aberration show the aberrations along the D, C, and F lines, respectively. According to... Figures 2C to 2H As can be seen, the zoom lens given in Example 2 has good aberration correction capability, can achieve good image quality, and can achieve low distortion.

[0129] Example 3

[0130] The following is for reference Figures 3A to 3H Description of a zoom lens according to Embodiment 3 of this application.

[0131] like Figure 3A and Figure 3B As shown, in this embodiment, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop (STOP), a second fixed lens group G3 with positive optical power, a second zoom lens group G4 with positive optical power, a first focusing lens group G5 with positive optical power, and a third fixed lens group G6 with negative optical power. Light incident from the object side passes sequentially through the lens surfaces of each lens group and is finally imaged onto the imaging plane Image.

[0132] Among them, the first zoom lens group G2 and the second zoom lens group G4 can move along the optical axis to perform optical zoom between the wide-angle end and the telephoto end of the zoom lens, and the first focusing lens group G5 can also move along the optical axis to correct the change in the image plane position of the zoom lens during the zoom process.

[0133] In this embodiment, the zoom lens includes 26 lenses with optical power. Along the optical axis from the object side to the image side, the first fixed lens group G1 includes five lenses L1 to L5, including two cemented doublet lenses L1 to L2 and L4 to L5, and the object-side surface surf1 of the lens L1 closest to the object side in the first fixed lens group G1 is convex; the first zoom lens group G2 includes five lenses L6 to L10, including two cemented doublet lenses L7 to L8 and L9 to L10, and the image-side surface surf16 of the lens L10 closest to the image side in the first zoom lens group G2 is concave; the second fixed lens group G3 includes two lenses L11 and L12, and the optical power of the lens L11 closest to the object side in the second fixed lens group G3 is positive, and the object-side surface surf18 is convex; the second The zoom lens group G4 includes seven lenses L13 to L19, including one cemented triplet lens L15 to L17 and one cemented doublet lens L18 to L19. The image-side surface (surf32) of the lens L19, which is closest to the image side of the second zoom lens group G4, is concave. The first focusing lens group G5 includes four lenses L20 to L23, including two cemented doublet lenses L20 to L21 and L22 to L23. The image-side surface (surf38) of the lens L23, which is closest to the image side of the first focusing lens group G5, is convex. The third fixed lens group G6 includes three lenses L24 to L26, including one positive lens L24 and two negative lenses L25 and L26. The image-side surface (surf43) of the lens L26, which is closest to the image side of the third fixed lens group G6, is a negative lens.

[0134] In this embodiment, the zoom lens from Figure 3A The wide-angle end shown Figure 3B During the zoom process at the telephoto end, the first zoom lens group G2 moves along the optical axis from the object side to the image side, and the second zoom lens group G4 moves along the optical axis from the image side to the object side to perform zoom. Simultaneously, the first focusing lens group G5 moves along the optical axis to correct for changes in the image plane position during zoom. During zoom, the positions of the first fixed lens group G1, the second fixed lens group G3, and the third fixed lens group G6 remain fixed.

[0135] In this embodiment, the distance TTL from the object side surface surf1 of the lens L1 closest to the object side of the first fixed lens group G1 of the zoom lens to the image plane Image is 204.085mm; the aperture coefficient FNO (WIDE) at the wide-angle end is 2.20; the focal length fw at the wide-angle end is 25.572mm; and the focal length ft at the telephoto end is 127.861mm.

[0136] Table 5 shows some basic parameters of each lens in the zoom lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0137]

[0138]

[0139] Table 5

[0140] In the first fixed lens group G1, the refractive index Nd3 and Abbe number Vd3 of one positive lens L3 are Nd3 = 1.92 and Vd3 = 20.9, respectively; the refractive index and Abbe number of the two positive lenses L13 and L19 in the second zoom lens group G4 are Nd3 = 1.92 and Vd3 = 20.9, respectively. 13 =1.99, Vd 13 =16.5, Nd 19 =1.87, Vd 19 =20.0.

[0141] The zoom range data for the zoom lens in this embodiment at the wide-angle and telephoto ends are shown in Table 6 below.

[0142] thickness Wide-angle end telephoto end surf8 0.891 43.691 surf16 44.135 1.335 surf21 24.409 0.600 surf32 4.123 29.586 surf38 2.254 0.600

[0143] Table 6

[0144] Figure 3C , Figure 3D and Figure 3E The magnification chromatic aberration, position chromatic aberration, and distortion at the wide-angle end in Example 3 when the object distance is infinitely far are shown respectively. Figure 3F , Figure 3G and Figure 3H The following diagrams show the chromatic aberration at magnification, positional chromatic aberration, and distortion at the focal length when the object distance is at infinity in Example 3. The chromatic aberration diagrams at magnification and positional chromatic aberration show the aberrations along the D, C, and F lines, respectively. According to... Figures 3C to 3H As can be seen, the zoom lens given in Example 3 has good aberration correction capability, can achieve good image quality, and can achieve low distortion.

[0145] Example 4

[0146] The following is for reference Figures 4A to 4H The zoom lens according to Embodiment 4 of this application is described.

[0147] like Figure 4A and Figure 4BAs shown, in this embodiment, the zoom lens, along the optical axis from the object side to the image side, sequentially includes: a first fixed lens group G1 with positive optical power, a first zoom lens group G2 with negative optical power, an aperture stop (STOP), a second fixed lens group G3 with negative optical power, a second zoom lens group G4 with positive optical power, a first focusing lens group G5 with positive optical power, and a third fixed lens group G6 with positive optical power. Light incident from the object side passes sequentially through the lens surfaces of each lens group and is finally imaged onto the imaging plane Image.

[0148] Among them, the first zoom lens group G2 and the second zoom lens group G4 can move along the optical axis to perform optical zoom between the wide-angle end and the telephoto end of the zoom lens, and the first focusing lens group G5 can also move along the optical axis to correct the change in the image plane position of the zoom lens during the zoom process.

[0149] In this embodiment, the zoom lens includes 26 lenses with optical power. Along the optical axis from the object side to the image side, the first fixed lens group G1 includes five lenses L1 to L5, including one cemented doublet lens L3 to L4, and the object side surface surf1 of the lens L1 closest to the object side in the first fixed lens group G1 is convex; the first zoom lens group G2 includes six lenses L6 to L11, including one cemented doublet lens L7 to L8 and one cemented triplet lens L9 to L11, and the image side surface surf18 of the lens L11 closest to the image side in the first zoom lens group G2 is concave; the second fixed lens group G3 includes two lenses L12 and L13, and the optical power of the lens L12 closest to the object side in the second fixed lens group G3 is positive, and the object side surface surf20 is convex. The second zoom lens group G4 includes seven lenses L14 to L20, including one cemented triplet lens L16 to L18 and one cemented doublet lens L19 to L20. The image-side surface (surf34) of the lens L20 closest to the image side of the second zoom lens group G4 is concave. The first focusing lens group G5 includes four lenses L21 to L24, including two cemented doublet lenses L21 to L22 and L23 to L24. The image-side surface (surf40) of the lens L24 closest to the image side of the first focusing lens group G5 is convex. The third fixed lens group G6 includes two lenses L25 to L26, including one positive lens L25 and one negative lens L26. The image-side surface (surf43) of the lens L26 closest to the image side of the third fixed lens group G6 is a negative lens.

[0150] In this embodiment, the zoom lens from Figure 4A The wide-angle end shown Figure 4BDuring the zoom process at the telephoto end, the first zoom lens group G2 moves along the optical axis from the object side to the image side, and the second zoom lens group G4 moves along the optical axis from the image side to the object side to perform zoom. Simultaneously, the first focusing lens group G5 moves along the optical axis to correct for changes in the image plane position during zoom. During zoom, the positions of the first fixed lens group G1, the second fixed lens group G3, and the third fixed lens group G6 remain fixed.

[0151] In this embodiment, the distance TTL from the object side surface surf1 of the lens L1 closest to the object side of the first fixed lens group G1 of the zoom lens to the image plane Image is 239.640mm; the aperture coefficient FNO (WIDE) at the wide-angle end is 2.20; the focal length fw at the wide-angle end is 45.000mm; and the focal length ft at the telephoto end is 250.000mm.

[0152] Table 7 shows some basic parameters of each lens in the zoom lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of the material, and Abbe number. The units for radius of curvature and thickness / distance are millimeters (mm).

[0153]

[0154]

[0155] Table 7

[0156] In the first fixed lens group G1, the refractive index Nd2 and Abbe number Vd2 of a positive lens L2 are Nd2 = 1.95 and Vd2 = 18.0, respectively; the refractive index Nd2 of a positive lens L20 in the second zoom lens group G4 is... 20 And Abbe number Vd 20 They are: Nd 20 =1.95, Vd 20 =18.0.

[0157] The zoom range data for the zoom lens in this embodiment at the wide-angle and telephoto ends are shown in Table 8 below.

[0158]

[0159]

[0160] Table 8

[0161] Figure 4C , Figure 4D and Figure 4E The magnification chromatic aberration, position chromatic aberration, and distortion at the wide-angle end in Example 4 when the object distance is infinitely far are shown respectively. Figure 4F , Figure 4G and Figure 4HThe magnification chromatic aberration, positional chromatic aberration, and distortion diagrams at the focal length with an infinity object distance in Example 4 are shown respectively. The magnification chromatic aberration diagram and the positional chromatic aberration diagram show the aberrations along the D line, C line, and F line, respectively. According to... Figures 4C to 4H As can be seen, the zoom lens given in Example 4 has good aberration correction capability, can achieve good image quality, and can achieve low distortion.

[0162] In summary, the zoom lenses in Embodiments 1 to 4 satisfy the conditions shown in Table 9 below.

[0163]

[0164] Table 9

[0165] The zoom lens provided by the embodiments of this application, by rationally setting the position of the lens group and the shape and power distribution of each lens, is conducive to achieving high-magnification efficiency and high-quality resolution across the entire focal length while ensuring low tolerance sensitivity of each lens group. By using a combination of cemented doublet or cemented triplicate lenses, aberrations can be effectively corrected, improving the resolution of the zoom lens and giving the lens good manufacturability. By matching the Abbe number and refractive index of the lenses, the problem of focus drift under high and low temperature environments is solved, ensuring that the lens does not have defocusing in the temperature range of -40℃ to 80℃, making it suitable for various high and low temperature environments and greatly expanding the application range of the zoom lens. In addition, by adopting an all-glass spherical lens structure and rationally distributing aberrant dispersion glass and high refractive index glass, high-quality imaging effect is achieved while reducing processing difficulty and improving lens manufacturability.

[0166] 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, The zoom lens, along the optical axis from the object side to the image side, sequentially comprises: a first fixed lens group with positive optical power, a first zoom lens group with negative optical power, a second fixed lens group with optical power, a second zoom lens group with positive optical power, a first focusing lens group with positive optical power, and a third fixed lens group with optical power; and The first fixed lens group comprises five lenses with optical power. The first lens along the optical axis from the object side to the image side has either positive or negative optical power; the second and fifth lenses both have positive optical power; and the third and fourth lenses have opposite optical power attributes. Specifically, when the first lens has positive optical power, the fourth lens has either positive or negative optical power; and when the first lens has negative optical power, the fourth lens has negative optical power. The second fixed lens group has two lenses with optical power. The first lens in the second fixed lens group along the optical axis from the object side to the image side has positive optical power, and the second lens has negative optical power. The first focusing lens group has four lenses with optical power. The first and fourth lenses in the first focusing lens group along the optical axis from the object side to the image side both have positive optical power, and the second and third lenses both have negative optical power. The first zoom lens group has five lenses with optical power, the third fixed lens group has three lenses with optical power, and the second zoom lens group has six or seven lenses with optical power; or, The first zoom lens group has six lenses with optical power, the second zoom lens group has seven lenses with optical power, and the third fixed lens group has two lenses with optical power; the zoom lens has six lens groups with optical power. During the zoom process from wide-angle to telephoto, the first zoom lens group moves along the optical axis from the object side to the image side, the second zoom lens group moves along the optical axis from the image side to the object side to perform zoom, and the first focusing lens group moves along the optical axis to correct the change in the image plane position during the zoom process. Among them, the distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane and the diameter of the imaging target surface of the zoom lens are included. Satisfies: 7.98≤TTL / ≤11.

72.

2. The zoom lens according to claim 1, wherein, The second zoom lens group includes at least four lenses with positive optical power and two lenses with negative optical power; and the lens closest to the object side of the second zoom lens group has positive optical power.

3. The zoom lens according to claim 1, wherein, The second zoom lens group includes at least two cemented lenses, one of which is a cemented triplet lens; and the image-side surface of the lens closest to the image side of the second zoom lens group is concave.

4. The zoom lens according to claim 1, wherein, The first fixed lens group includes at least one cemented lens, and the object side of the lens closest to the object side of the first fixed lens group is convex.

5. The zoom lens according to claim 1, wherein, The first zoom lens group includes three lenses with negative optical power and two lenses with positive optical power, and the lens closest to the object side of the first zoom lens group has negative optical power.

6. The zoom lens according to claim 1, wherein, The first zoom lens group includes at least one cemented lens, and the image side of the lens closest to the image side of the first zoom lens group is concave.

7. The zoom lens according to claim 1, wherein, The first focusing lens group includes at least one cemented lens, and the image side of the lens closest to the image side of the first focusing lens group is convex.

8. The zoom lens according to claim 1, wherein, The object-side surface of the lens closest to the object side in the second fixed lens group is convex.

9. The zoom lens according to claim 1, wherein, The third fixed lens group includes at least one lens with positive optical power and at least one lens with negative optical power, and the lens closest to the image side of the third fixed lens group has negative optical power and a concave object side.

10. The zoom lens according to any one of claims 1-9, wherein, The focal length fw at the wide-angle end of the zoom lens and the focal length ft at the telephoto end of the zoom lens satisfy the following condition: 20.46mm≤(ft-fw) / (ft / fw)≤36.90mm.

11. The zoom lens according to any one of claims 1-9, wherein, The distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane, the focal length fw of the zoom lens at the wide-angle end, and the focal length ft of the zoom lens at the telephoto end satisfy: 1.17≤TTL / (ft-fw)≤2.

00.

12. The zoom lens according to any one of claims 1-9, wherein, The following distances satisfy the following conditions: TTL (distance from the object side of the lens closest to the object side in the first fixed lens group to the imaging plane), d12t (distance from the image side of the lens closest to the image side in the first fixed lens group to the object side of the lens closest to the object side in the first zoom lens group when the zoom lens is at the telephoto end), d12w (distance from the image side of the lens closest to the image side in the first fixed lens group to the object side of the lens closest to the object side in the first zoom lens group when the zoom lens is at the wide-angle end), d45t (distance from the image side of the lens closest to the image side in the second zoom lens group to the object side of the lens closest to the object side in the first focusing lens group when the zoom lens is at the telephoto end), and d45w (distance from the image side of the lens closest to the image side in the second zoom lens group to the object side of the lens closest to the object side in the first focusing lens group when the zoom lens is at the wide-angle end): 2.25≤TTL / [(d12t-d12w)+(d45t-d45w)]≤2.

99.

13. The zoom lens according to any one of claims 1-9, wherein, The distance d34t between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the telephoto end, the distance d34w between the image side of the lens closest to the image side of the second fixed lens group and the object side of the lens closest to the object side of the second zoom lens group when the zoom lens is at the wide-angle end, the focal length fw of the zoom lens at the wide-angle end, and the focal length ft of the zoom lens at the telephoto end satisfy: 4.76mm≤(d34t-d34w) / (ft / fw)≤6.50mm.

14. The zoom lens according to any one of claims 1-9, wherein, The focal length fw of the zoom lens at the wide-angle end, the focal length ft of the zoom lens at the telephoto end, and the diameter of the imaging target surface of the zoom lens. Satisfies: 4.00 ≤ (ft - fw) / ≤8.

02.

15. The zoom lens according to any one of claims 1-9, wherein, The focal length fw of the zoom lens at the wide-angle end and the focal length f4 of the second zoom lens group satisfy: 1.23≤f4 / fw≤2.

50.

16. The zoom lens according to any one of claims 1-9, wherein, The focal length ft of the zoom lens at the telephoto end and the focal length f2 of the first zoom lens group satisfy: -6.35≤ft / f2≤-3.

88.

17. The zoom lens according to any one of claims 1-9, wherein, The focal length ft of the zoom lens at the telephoto end, the focal length fw of the zoom lens at the wide-angle end, and the focal length f5 of the first focusing lens group satisfy: 1.05≤(ft-fw) / f5≤2.

17.

18. The zoom lens according to any one of claims 1-9, wherein, The following distances satisfy the following conditions for zoom lenses at the telephoto end: d12t (the distance from the image side of the lens closest to the image side of the first fixed lens group to the object side of the lens closest to the object side of the first zoom lens group), d12w (the distance from the image side of the lens closest to the image side of the first fixed lens group to the object side of the lens closest to the object side of the first zoom lens group), d34w (the distance from the image side of the lens closest to the image side of the second fixed lens group to the object side of the lens closest to the object side of the second zoom lens group), and d34t (the distance from the image side of the lens closest to the image side of the second fixed lens group to the object side of the lens closest to the object side of the second zoom lens group).

19. The zoom lens according to any one of claims 1-9, wherein, The following distances satisfy the following conditions: 1.10 ≤ (d34w - d34t) / (d56w - d56t) ≤ 14.39 when the zoom lens is at the wide-angle end; d34t when the zoom lens is at the telephoto end; d56w when the zoom lens is at the wide-angle end; d34t when the zoom lens is at the telephoto ...

20. The zoom lens according to any one of claims 1-9, wherein, The focal length ft of the zoom lens at the telephoto end, the focal length fw of the zoom lens at the wide-angle end, the distance d45t between the image side of the second zoom lens group closest to the image side and the object side of the first focusing lens group closest to the object side when the zoom lens is at the telephoto end, and the distance d45w between the image side of the second zoom lens group closest to the image side and the object side of the first focusing lens group closest to the object side when the zoom lens is at the wide-angle end satisfy: 3.31≤(ft-fw) / (d45t-d45w)≤4.

33.

21. The zoom lens according to any one of claims 1-9, wherein, The distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane satisfies the following condition: -6.76≤TTL / f2≤-5.

04.

22. The zoom lens according to any one of claims 1-9, wherein, The distance TTL from the object side of the lens closest to the object side of the first fixed lens group to the imaging plane satisfies the following condition: 3.17≤TTL / f4≤4.

35.

23. The zoom lens according to any one of claims 1-9, wherein, The focal length f1 of the first fixed lens group and the focal length f2 of the first zoom lens group satisfy: -3.76≤f1 / f2≤-2.

58.

24. The zoom lens according to any one of claims 1-9, wherein, The Abbe number Vd of at least one lens with positive optical power in the first fixed lens group m and refractive index Nd m Each satisfies: 18.0 ≤ Vd m ≤20.9; 1.92≤Nd m ≤1.95, where m is a positive integer.

25. The zoom lens according to any one of claims 1-9, wherein, The Abbe number Vd of at least one lens with positive optical power in the second zoom lens group n and refractive index Nd n Each satisfies: 16.5 ≤ Vd n ≤20.0; 1.87≤Nd n ≤1.99, where n is a positive integer.

Images