A zoom lens

Abstract

This invention discloses a zoom lens comprising a focusing lens group with negative optical power, a first zoom lens group with positive optical power, an aperture stop, and a second zoom lens group with positive optical power, arranged sequentially along the optical axis from object side to image side. The focusing lens group includes a first lens with negative optical power, a second lens with negative optical power, and a third lens with positive optical power. The first zoom lens group includes a fourth lens with positive optical power. The second zoom lens group includes a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, and a tenth lens with positive optical power. When the zoom lens is switched between wide-angle and telephoto ends, the focusing lens group, the first zoom lens group, and the second zoom lens group move synchronously along the optical axis. This invention achieves a zoom lens with advantages such as large aperture, high resolution, large target area, small size, and infrared confocal focusing.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more particularly to a zoom lens. Background Technology

[0002] In recent years, the demand for lenses in the surveillance market has become increasingly diversified. In the security field, zoom lenses have been widely used due to their advantages such as long shooting distance and wide shooting angle. Furthermore, with the development of technology, cameras are gradually moving towards miniaturization and refinement, which also places more stringent requirements on mainstream zoom lenses.

[0003] For zoom lenses, the market demands that they achieve large aperture zoom across the entire focal length while meeting high resolution and large sensor size requirements. This is essential to capture high-definition images even in situations with insufficient external lighting. Currently, conventional zoom lenses typically have a thicker lens barrel to achieve a large aperture. Furthermore, to enhance image quality, they often utilize a significantly larger proportion of glass elements. However, for scenarios where size is a concern, these lenses become unsuitable, resulting in issues such as small aperture, lack of infrared confocal focus, and high cost. Summary of the Invention

[0004] This invention provides a zoom lens that achieves advantages such as large aperture, high definition, large target area, small size, and infrared confocal focus.

[0005] An embodiment of the present invention provides a zoom lens, comprising a focusing lens group with negative optical power, a first zoom lens group with positive optical power, an aperture stop, and a second zoom lens group with positive optical power, arranged sequentially along the optical axis from the object side to the image side;

[0006] The focusing lens group includes a first lens with negative optical power, a second lens with negative optical power, and a third lens with positive optical power;

[0007] The first zoom lens group includes a fourth lens with positive optical power;

[0008] The second zoom lens group includes a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, and a tenth lens with positive optical power.

[0009] When the zoom lens switches between the wide-angle end and the telephoto end, the focusing lens group, the first zoom lens group, and the second zoom lens group move synchronously along the optical axis.

[0010] Optionally, the focusing lens group, the first zoom lens group, and the second zoom lens group satisfy the following relationship:

[0011] -2.56≤FG1 / FW≤-2.50;

[0012] 1684.80≤FG2 / FW≤1903.58;

[0013] 3.09≤FG3 / FW≤3.15;

[0014] Wherein, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the first zoom lens group, FG3 is the focal length of the second zoom lens group, and FW is the focal length of the wide-angle end of the zoom lens.

[0015] Optionally, the focusing lens group, the first zoom lens group, and the second zoom lens group satisfy the following relationship:

[0016] -0.90≤FG1 / FT≤-0.89;

[0017] 592.3≤FG2 / FT≤667.17;

[0018] 1.10≤FG3 / FT≤1.11;

[0019] Wherein, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the first zoom lens group, FG3 is the focal length of the second zoom lens group, and FT is the focal length of the telephoto end of the zoom lens.

[0020] Optionally, the first lens, the sixth lens, the seventh lens, and the eighth lens are all glass spherical lenses, the second lens, the third lens, the fourth lens, the ninth lens, and the tenth lens are plastic aspherical lenses, and the fifth lens is a glass aspherical lens.

[0021] Optionally, the fourth lens, the fifth lens, the eighth lens, and the ninth lens satisfy the following requirements:

[0022] 1.533≤nd4≤1.545; 55.699≤vd4≤56.003;

[0023] 1.497≤nd5≤1.498; 81.352≤vd5≤90.506;

[0024] 1.466≤nd8≤1.498;81.223≤vd8≤81.637;

[0025] 1.640≤nd9≤1.661;20.389≤vd9≤23.492;

[0026] Wherein, nd4, nd5, nd8, and nd9 are the refractive indices of the fourth lens, the fifth lens, the eighth lens, and the ninth lens, respectively, and vd4, vd5, vd8, and vd9 are the Abbe numbers of the fourth lens, the fifth lens, the eighth lens, and the ninth lens, respectively.

[0027] Optionally, the sixth lens, the seventh lens, and the eighth lens are cemented together in sequence to form a three-cemented lens group.

[0028] Optionally, the triplexed lens group satisfies the following relationship: 4.50≤F678 / FG3≤5.39;

[0029] Wherein, F678 is the focal length of the three-cement lens group, and FG3 is the focal length of the second zoom lens group.

[0030] Optionally, the zoom lens satisfies the following relationship: 2.82 ≤ FT / FW ≤ 2.85;

[0031] Wherein, FW is the focal length at the wide-angle end of the zoom lens, and FT is the focal length at the telephoto end of the zoom lens.

[0032] Optionally, the focusing lens group, the first zoom lens group, and the second zoom lens group satisfy the following relationship:

[0033] 0.34≤S2 / S1≤0.35;

[0034] 0.79≤S3 / S1≤0.84;

[0035] Wherein, S1 is the maximum movable distance of the focusing lens group, S2 is the maximum movable distance of the first zoom lens group, and S3 is the maximum movable distance of the second zoom lens group.

[0036] Optionally, the zoom lens, the first zoom lens group, and the second zoom lens group satisfy the following relationship:

[0037] 15.93≤TTL / S2≤17.01;

[0038] 7.05≤TTL / S3≤7.16;

[0039] Wherein, TTL is the total optical length of the telephoto end of the zoom lens, S2 is the maximum movable distance of the first zoom lens group, and S3 is the maximum movable distance of the second zoom lens group.

[0040] The zoom lens provided in this embodiment of the invention, by setting up a focusing lens group, a first zoom lens group, an aperture stop, and a second zoom lens group, with optical power in the order of negative-positive-positive; wherein, the focusing lens group includes three lenses with optical power in the order of negative-negative-positive, the first zoom lens group includes one lens with positive optical power, and the second zoom lens group includes six lenses with optical power in the order of positive-positive-negative-positive-negative-positive, this achieves zooming by moving the first and second zoom lens groups along the optical axis while the focusing lens group moves along the optical axis to compensate for aberrations, thereby achieving clear imaging. This embodiment of the invention uses 10 lenses and a certain thickness of flat glass, enabling a zoom lens with advantages such as large aperture, high definition, large target surface, small size, and infrared confocality in the 436nm-850nm wavelength band under a 1 / 2.7″ target surface. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention;

[0042] Figure 2 for Figure 1 The diagram shows the structure of the zoom lens at the telephoto end.

[0043] Figure 3 for Figure 1 The image shows the ray fan diagram of the zoom lens at the wide-angle end;

[0044] Figure 4 for Figure 1 The axial aberration curve of the zoom lens at the wide-angle end is shown.

[0045] Figure 5 for Figure 1 The modulation transfer function curves of the zoom lens at the wide-angle end in the visible and infrared bands are shown.

[0046] Figure 6 for Figure 2 The image shows the ray fan diagram of the zoom lens at the telephoto end;

[0047] Figure 7 for Figure 2 The axial aberration curve of the zoom lens at the telephoto end is shown.

[0048] Figure 8 for Figure 2 The modulation transfer function curves of the zoom lens at the telephoto end in the visible and infrared bands are shown.

[0049] Figure 9 This is a schematic diagram of the structure of a zoom lens at the wide-angle end according to Embodiment 2 of the present invention;

[0050] Figure 10 yes Figure 9The diagram shows the structure of the zoom lens at the telephoto end.

[0051] Figure 11 for Figure 9 The image shows the light fan pattern of the zoom lens at different image heights at the wide-angle end;

[0052] Figure 12 for Figure 9 The axial aberration curve of the zoom lens at the wide-angle end is shown.

[0053] Figure 13 for Figure 9 The modulation transfer function curves of the zoom lens at the wide-angle end in the visible and infrared bands are shown.

[0054] Figure 14 for Figure 10 The image shows the light fan pattern of the zoom lens at different image heights at the telephoto end.

[0055] Figure 15 for Figure 10 The axial aberration curve of the zoom lens at the telephoto end is shown.

[0056] Figure 16 for Figure 10 The modulation transfer function curves of the zoom lens at the telephoto end in the visible and infrared bands are shown.

[0057] Figure 17 This is a schematic diagram of the structure of a zoom lens at the wide-angle end provided in Embodiment 3 of the present invention;

[0058] Figure 18 yes Figure 17 The diagram shows the structure of the zoom lens at the telephoto end.

[0059] Figure 19 for Figure 17 The image shows the light fan pattern of the zoom lens at different image heights at the wide-angle end;

[0060] Figure 20 for Figure 17 The axial aberration curve of the zoom lens at the wide-angle end is shown.

[0061] Figure 21 for Figure 17 The modulation transfer function curves of the zoom lens at the wide-angle end in the visible and infrared bands are shown.

[0062] Figure 22 for Figure 18 The image shows the light fan pattern of the zoom lens at different image heights at the telephoto end.

[0063] Figure 23 for Figure 18 The axial aberration curve of the zoom lens at the telephoto end is shown.

[0064] Figure 24 for Figure 18 The modulation transfer function curves of the zoom lens at the telephoto end in the visible and infrared bands are shown. Detailed Implementation

[0065] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0066] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0067] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0068] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0069] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0070] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of the present invention. Figure 2 for Figure 1 The diagram shown is a structural schematic of the zoom lens at the telephoto end. (Refer to...) Figure 1 and Figure 2The zoom lens comprises a focusing lens group G1 with negative optical power, a first zoom lens group G2 with positive optical power, an aperture stop STO, and a second zoom lens group G3 with positive optical power, arranged sequentially along the optical axis from the object side to the image side. The focusing lens group G1 includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, and a third lens L3 with positive optical power; the first zoom lens group G2 includes a fourth lens L4 with positive optical power; and the second zoom lens group G3 includes a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an eighth lens L8 with positive optical power, a ninth lens L9 with negative optical power, and a tenth lens L10 with positive optical power. When the zoom lens is switched between the wide-angle and telephoto ends, the focusing lens group G1, the first zoom lens group G2, and the second zoom lens group G3 move synchronously along the optical axis.

[0071] First, it's understandable that optical power equals the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light. The larger the absolute value of optical power, the stronger the bending ability of light; the smaller the absolute value, the weaker the bending ability. When optical power is positive, the refraction of light is converging; when optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens or lens group, or a system composed of multiple lenses (i.e., a group or lens assembly). It's also understandable that in the process of zooming by moving the corresponding lens group, the zoom lens is at its shortest focal length (wide-angle end) and at its longest focal length (telephoto end). At the wide-angle and telephoto ends, the zoom lens has different focal lengths and optical powers, as well as different lengths or shapes. In this embodiment of the invention, the focusing lens group G1, the first zoom lens group G2, the aperture stop STO, and the second zoom lens group G3 can be disposed in a single lens barrel. The aperture stop STO is fixed in position within the lens barrel, meaning that its position relative to the image plane remains consistent across different focal lengths, and its aperture is the same across different focal lengths. The focusing lens group G1, the first zoom lens group G2, and the second zoom lens group G3 can reciprocate along the optical axis within the lens barrel to achieve switching between wide-angle and telephoto ends of the zoom lens. The first zoom lens group G2 and the second zoom lens group G3 are used to adjust the focal length of the lens by moving, while the focusing lens group G1 is used to compensate for aberrations caused by the movement of the first zoom lens group G2 and the second zoom lens group G3, ensuring clear imaging. Furthermore, by placing a negative optical power focusing lens group G1 and a positive optical power first zoom lens group G2 in front of the aperture stop STO in the entire optical system, a larger beam diameter can be generated after light passes through, increasing the aperture of the optical system and meeting the usage requirements under different conditions. The second zoom lens group G3 behind the aperture stop STO can cooperate with the lens group in front of the aperture stop STO to stabilize the imaging quality of the optical system. In addition, this embodiment of the invention uses two movable zoom lens groups for zooming, while simultaneously utilizing the movement of the focusing lens group G1 for image quality compensation. Essentially, this achieves a longer travel distance and relatively greater degrees of freedom of movement through two movable groups, thereby achieving a higher imaging magnification. At the same time, using two movable zoom lens groups to adapt to the fixed aperture stop STO with a constant aperture not only reduces the aperture diameter and lens size, helping to reduce the lens volume, but also achieves a smaller F-number at each focal length, i.e., a larger aperture, meeting the demand for large apertures at different focal lengths.

[0072] It should be added that the zoom lens in this embodiment of the invention is also provided with a planar glass CG; the planar glass CG is located on one side of the image surface of the tenth lens L10, and the planar glass CG can protect the photosensitive chip (not shown in the figure) in the imaging sensor located on the image surface. The photosensitive chip is used to convert the light signal collected by the zoom lens into an electrical signal, thereby realizing the imaging of the zoom lens.

[0073] The zoom lens provided in this embodiment of the invention, by setting a focusing lens group G1, a first zoom lens group G2, an aperture stop STO, and a second zoom lens group G3, with optical power in the order of negative-positive-positive; wherein, the focusing lens group includes three lenses with optical power in the order of negative-negative-positive, the first zoom lens group G2 includes one lens with positive optical power, and the second zoom lens group G3 includes six lenses with optical power in the order of positive-positive-negative-positive-negative-positive, this achieves zooming by moving the first zoom lens group G2 and the second zoom lens group G3 along the optical axis, while the focusing lens group moves along the optical axis to compensate for aberrations, thereby achieving clear imaging. This embodiment of the invention uses 10 lenses and a certain thickness of flat glass, enabling a zoom lens with advantages such as large aperture, high definition, large target surface, small size, and infrared confocality in the 436nm-850nm wavelength range under a 1 / 2.7″ target surface.

[0074] In one specific embodiment, the focusing lens group G1, the first zoom lens group G2, and the second zoom lens group G3 satisfy the following relationships: -2.56≤FG1 / FW≤-2.50; 1684.80≤FG2 / FW≤1903.58; 3.09≤FG3 / FW≤3.15; where FG1 is the focal length of the focusing lens group G1, FG2 is the focal length of the first zoom lens group G2, FG3 is the focal length of the second zoom lens group G3, and FW is the focal length at the wide-angle end of the zoom lens.

[0075] By limiting the three lens groups to meet the above focal length ratio range, a reasonable combination of optical power among the three lens groups can be ensured, allowing light to pass through the lens more smoothly and greatly correcting the impact of advanced aberrations at the wide-angle end of the zoom lens on image quality.

[0076] In one specific embodiment, the focusing lens group G1, the first zoom lens group G2, and the second zoom lens group G3 satisfy the following relationships: -0.90≤FG1 / FT≤-0.89; 592.3≤FG2 / FT≤667.17; 1.10≤FG3 / FT≤1.11; where FG1 is the focal length of the focusing lens group G1, FG2 is the focal length of the first zoom lens group G2, FG3 is the focal length of the second zoom lens group G3, and FT is the focal length at the telephoto end of the zoom lens.

[0077] Similarly, by setting three lens groups to meet the above focal length ratio range, a reasonable combination of optical power can be achieved, allowing light to pass through the lens more smoothly and greatly correcting the impact of advanced aberrations at the telephoto end of the zoom lens on image quality.

[0078] Optionally, the first lens L1, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all glass spherical lenses, the second lens L2, the third lens L3, the fourth lens L4, the ninth lens L9 and the tenth lens L10 are plastic aspherical lenses, and the fifth lens L5 is a glass aspherical lens.

[0079] Furthermore, the fourth lens L4, the fifth lens L5, the eighth lens L8, and the ninth lens L9 satisfy the following requirements: 1.533≤nd4≤1.545; 55.699≤vd4≤56.003; 1.497≤nd5≤1.498; 81.352≤vd5≤90.506; 1.466≤nd8≤1.498; 81.223≤vd8≤81.637; 1.640≤nd9≤1.661; 20.389≤vd9≤23.492; where nd4, nd5, nd8, and nd9 are the refractive indices of the fourth lens L4, the fifth lens L5, the eighth lens L8, and the ninth lens L9, respectively, and vd4, vd5, vd8, and vd9 are the Abbe numbers of the fourth lens L4, the fifth lens L5, the eighth lens L8, and the ninth lens L9, respectively.

[0080] Specifically, plastic aspherical lenses are used for the second lens L2 and the third lens L3 in the focusing lens group G1, and the fourth lens L4 in the first zoom lens group G2. This is to correct advanced chromatic aberration and other aberrations, control the aberration balance of each group, ensure that the structure after light enters the aperture stop STO does not produce severe aberrations, and improve the imaging quality of the optical system. For the fifth lens L5 in the second zoom lens group G3, a glass aspherical lens is used. This is to achieve day and night confocal focusing of the zoom lens in the sensitive area near the aperture stop STO by utilizing the stable high and low temperature performance of glass.

[0081] Specifically, the correction of chromatic aberration and higher aberrations in this zoom lens primarily relies on aspherical lenses. Therefore, the material selection for the fourth lens L4, fifth lens L5, and eighth lens L8, located before and after the STO (Side Stop), is crucial. Introducing aspherical lenses before and after the STO effectively improves chromatic aberration in light passing through it. Simultaneously, the high Abbe number of the fifth lens L5 effectively corrects chromatic aberration in light after the STO. The high Abbe number material used in the eighth lens L8 corrects chromatic aberration and higher aberrations at the rear of the lens. The ninth lens L9, using the aforementioned lens materials, corrects chromatic aberration and aberrations throughout the lens, controlling them within a reasonable range before light enters the image plane. Furthermore, aspherical lenses have excellent control over higher aberrations in the optical system. The use of aspherical lenses in the fourth lens L4, fifth lens L5, and ninth lens L9 further reduces higher aberrations as light enters the image plane, resulting in improved image quality and meeting the requirements of 4K imaging. Finally, glass lenses are not sensitive to temperature. The fifth lens, L5, uses a glass aspherical lens, which allows for more consistent lens performance under different temperature conditions, exhibiting stable performance at both high and low temperatures. Furthermore, the fourth lens, L4, the fifth lens, L5, and the ninth lens, L9, use plastic aspherical lenses, which effectively compensate for the expansion / contraction of the lens frame at high and low temperatures, improving the environmental adaptability of the zoom lens. The introduction of glass aspherical lenses also significantly corrects chromatic aberration and higher aberrations, offering a wider range of choices compared to plastic aspherical lenses, allowing for more diverse structural options and enhancing the lens's market competitiveness.

[0082] In one specific embodiment, optionally, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are cemented together in sequence to form a cemented triplet lens group.

[0083] In addition, the correction of chromatic aberration and advanced aberrations in this zoom lens also relies on cemented triplet lenses. After light passes through the aperture STO, the cemented triplet lens group can effectively correct chromatic aberration, avoiding the superposition of chromatic aberration at the rear of the lens, which would require a large amount of high Abbe number material to pull back the aberration. It can also effectively reduce chromatic aberration, achieving confocal imaging in both the visible and near-infrared bands while maintaining clear imaging. Furthermore, by setting the sixth lens L6, the seventh lens L7, and the eighth lens L8 to form a cemented triplet lens group, the air gap between the sixth lens L6, the seventh lens L7, and the eighth lens L8 can be effectively reduced, thereby further reducing the overall length of the lens.

[0084] Furthermore, the cemented triplet lens group satisfies the following relationship: 4.50≤F678 / FG3≤5.39; where F678 is the focal length of the cemented triplet lens group and FG3 is the focal length of the second zoom lens group G3.

[0085] By limiting the focal length ratio range of the cemented lens group and its associated second zoom lens group G3, the chromatic aberration can be reduced by the complementary chromatic aberration of the positive and negative optical power surfaces of the cemented lens. At the same time, the remaining chromatic aberration is used to balance the chromatic aberration caused by other components of the zoom lens, so that various aberrations of the zoom lens can be fully corrected, improving imaging performance. Under the premise of compact structure, resolution can be improved, optical performance such as distortion can be optimized, and light loss caused by reflection between lenses can be reduced, thus improving illumination, thereby improving image quality and enhancing the sharpness of the lens image.

[0086] In one specific embodiment, the zoom lens satisfies the following relationship: 2.82≤FT / FW≤2.85; where FW is the focal length at the wide-angle end of the zoom lens, and FT is the focal length at the telephoto end of the zoom lens.

[0087] By limiting the zoom lens to meet the above-mentioned focal length ratio range at the wide-angle and telephoto ends, distortion can be controlled within a reasonable small range while ensuring the zoom range and large target area, thus meeting the requirement of small lens distortion.

[0088] In one specific embodiment, the focusing lens group G1, the first zoom lens group G2, and the second zoom lens group G3 satisfy the following relationship: 0.34≤S2 / S1≤0.35; 0.79≤S3 / S1≤0.84; where S1 is the maximum movable distance of the focusing lens group G1, S2 is the maximum movable distance of the first zoom lens group G2, and S3 is the maximum movable distance of the second zoom lens group G3.

[0089] This limitation restricts the movement distances of the focusing lens group G1, the first zoom lens group G2, and the second zoom lens group G3 to a specific ratio range, ensuring that the volume and range of motion of the focusing lens group G1 are minimized to the greatest extent, thereby significantly reducing the lens size.

[0090] In one specific embodiment, the zoom lens, the first zoom lens group G2, and the second zoom lens group G3 satisfy the following relationship: 15.93≤TTL / S2≤17.01; 7.05≤TTL / S3≤7.16; where TTL is the total optical length at the telephoto end of the zoom lens, S2 is the maximum movable distance of the first zoom lens group G2, and S3 is the maximum movable distance of the second zoom lens group G3.

[0091] It is understandable that the total optical length at the telephoto end is the maximum total length of the zoom lens during the entire zoom process. Here, the total optical length at the telephoto end of the zoom lens and the moving distance of the first zoom lens group G2 and the second zoom lens group G3 are limited to meet a specific ratio range, which can compress the lens space and ensure that the required image quality and zoom level are met under the condition of small lens size.

[0092] Based on the same concept described above, this invention provides three different specific embodiments, the optical power relationship and related physical optical parameter design ranges of which are shown in Table 1:

[0093] Table 1 shows the relationship between the optical power of each lens and the design values ​​of related physical and optical parameters in the three embodiments.

[0094]

[0095]

[0096] like Figure 1 and Figure 2 The parameter design values ​​of each lens in the zoom lens of Embodiment 1 are shown in Table 2:

[0097] Table 2 shows a design value for each lens in the zoom lens of Example 1.

[0098]

[0099]

[0100] The surface numbers in Table 2 are assigned according to the surface sequence of each lens; where "STO" represents the aperture stop of the zoom lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; "INF" indicates that the surface is flat and the radius of curvature is infinite; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface. The zoom interval values ​​in Table 2 are shown in Table 3.

[0101] Table 3 shows a design value for the zoom interval of the zoom lens at the wide-angle and telephoto ends in Example 1.

[0102] Wide-angle end telephoto end Zoom interval 1 13.5180 0.6157 Zoom interval 2 13.5180 0.6157 Zoom interval 3 4.5752 0.3196 Zoom interval 4 1.8970 9.5273

[0103] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0104] Where Z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis at a height r; c represents the curvature at the vertex of the aspherical surface; k is the fitted conic coefficient; a4, a6, a8, a 10 a 12 For the higher-order aspheric coefficients corresponding to the fourth, sixth, eighth, tenth, and twelfth orders of aspheric surfaces, a i r iThese are combined to form higher-order terms for the corresponding aspherical surfaces. The coefficients of the even-order terms for each aspherical surface in Example 1 above are shown in Table 4:

[0105] Table 4 Aspherical parameters of each lens in the zoom lens in Example 1

[0106]

[0107] Where -6.445577515439E-05 indicates that the coefficient a4 of surface number 4 is -6.445577515439*10 -5 And so on.

[0108] The parameters of the zoom lens in this embodiment are shown in Table 5:

[0109] Table 5. Parameter specifications of the zoom lens in Example 1

[0110] Wide-angle end telephoto end Image plane size (mm) Φ7.0 Φ7.0 Focal length (mm) 3.27 9.33 Waveband (nm) 436-850 436-850 Total optical length (mm) 50.41 53.77

[0111] Figure 3 for Figure 1 The image shows a fan plot of light rays from a zoom lens at the wide-angle end. In a single image, the horizontal axis represents the normalized beam diameter, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, meaning all light rays in that field of view should focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The fan plot not only reflects monochromatic aberrations at different wavelengths but also indicates the magnitude of transverse chromatic aberration. Figure 3 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths within the wide-angle field of view, indicating that the transverse aberration of each wavelength is well corrected. Furthermore, the curves for each color do not show significant dispersion, indicating that this zoom lens also provides good correction for chromatic aberration, meeting the usage requirements of this zoom lens.

[0112] Figure 4 for Figure 1 The diagram shows the axial aberration curve of the zoom lens at the wide-angle end. The vertical direction represents the normalized aperture, with 0 indicating on the optical axis. The vertex in the perpendicular direction represents the maximum pupil radius. The dominant wavelength is 546.07 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 4 It can be seen that the axial aberrations of different wavelengths (0.3–1.0 normalized aperture) are all controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberrations at the wide-angle end, meeting the usage requirements. Furthermore, at pupil positions of 0.5–0.9, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement of clear nighttime imaging and achieving clear images across the entire wavelength range.

[0113] Figure 5 for Figure 1The modulation transfer function (MJF) curves of the zoom lens at the wide-angle end in the visible and infrared bands are shown. The vertical axis represents the MJF value, and the horizontal axis represents the frequency. The simulated wavelength range is 436 nm to 850 nm, with 546.07 nm as the dominant wavelength. Figure 5 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. The modulation transfer function values ​​in the entire field of view are all greater than 0.5 in the 80lp / mm frequency band, indicating that the image quality of the zoom lens is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0114] Figure 6 for Figure 2 The image shows a fan plot of light rays from a zoom lens at the telephoto end. In a single image, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, in which case all light rays in that field of view focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The fan plot not only reflects monochromatic aberrations at different wavelengths but also indicates the magnitude of transverse chromatic aberration. Figure 6 It can be seen that, at the telephoto end, all wavelengths of this zoom lens closely approximate the horizontal axis in each field of view, indicating that the transverse aberration of each wavelength is well corrected. Furthermore, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good chromatic aberration correction, meeting the usage requirements of this zoom lens.

[0115] Figure 7 for Figure 2 The image shows the axial aberration curve of the zoom lens at the telephoto end. The vertical direction represents the normalized aperture, with 0 indicating it's on the optical axis. The vertex in the perpendicular direction represents the maximum pupil radius. The dominant wavelength is 546.07 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 7 It can be seen that the axial aberrations of the normalized aperture at different wavelengths (0.3–1.0) are all controlled within a reasonable range, indicating that the axial aberrations of the zoom lens are well controlled at the telephoto end, meeting the usage requirements. In addition, at the pupil positions of 0.5–0.9, there is no obvious chromatic aberration between visible and infrared light, meeting the basic requirement of clear imaging at night and achieving a clear image across the entire wavelength range.

[0116] Figure 8 for Figure 2 The modulation transfer function (MJF) curves of the zoom lens at the telephoto end in the visible and infrared bands are shown. The vertical axis represents the MJF value, and the horizontal axis represents the frequency. The simulated wavelength range is 436 nm to 850 nm, with 546.07 nm as the dominant wavelength. Figure 8It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. The modulation transfer function values ​​in the entire field of view are all greater than 0.5 in the 80lp / mm band, indicating that the image quality of the zoom lens is well controlled at the telephoto end, which meets the requirements of 4K camera use.

[0117] Figure 9 This is a schematic diagram of the structure of a zoom lens at the wide-angle end according to Embodiment 2 of the present invention. Figure 10 yes Figure 9 The diagram shown is a structural schematic of the zoom lens at the telephoto end. (Refer to...) Figure 9 and Figure 10 The parameter design values ​​of each lens in the zoom lens of this embodiment two are shown in Table 6:

[0118] Table 6 shows a design value for each lens in the zoom lens of Example 2.

[0119]

[0120]

[0121] The surface numbers in Table 6 are assigned according to the surface sequence of each lens; where "STO" represents the aperture stop of the zoom lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; "INF" indicates that the surface is flat and the radius of curvature is infinite; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface. The zoom interval values ​​in Table 6 are shown in Table 7.

[0122] Table 7 shows a design value for the zoom interval of the zoom lens at the wide-angle and telephoto ends in Example 2.

[0123]

[0124]

[0125] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0126] Where Z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis at a height r; c represents the curvature at the vertex of the aspherical surface; k is the fitted conic coefficient; a4, a6, a8, a 10 a 12 a 14 a16 For the higher-order aspheric coefficients corresponding to the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders of aspheric surfaces, a i r i These are combined to form higher-order terms for the corresponding aspherical surfaces. The coefficients of the even-order terms for each aspherical surface in Example 2 above are shown in Table 8:

[0127] Table 8. Aspherical parameters of each lens in the zoom lens in Example 2.

[0128]

[0129]

[0130] Where -5.725016578700E-05 indicates that the coefficient a4 of surface number 4 is -5.725016578700 * 10 -5 And so on.

[0131] The parameters of the zoom lens in this embodiment two are shown in Table 9:

[0132] Table 9. Parameter specifications of the zoom lens in Example 2

[0133] Wide-angle end telephoto end Image plane size (mm) Φ7 Φ7 Focal length (mm) 3.28 9.33 Waveband (nm) 436-850 436-850 Total optical length (mm) 50.85 54.16

[0134] Figure 11 for Figure 9 The diagram shows the ray fan plots of a zoom lens at different image heights at the wide-angle end. In a single plot, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, in which case all rays in that field of view should focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan plot not only reflects monochromatic aberration at different wavelengths but also indicates the magnitude of transverse chromatic aberration. Figure 11 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths within the wide-angle field of view, indicating that the transverse aberration of each wavelength is well corrected. Furthermore, the curves for each color do not show significant dispersion, indicating that this zoom lens also provides good correction for chromatic aberration, meeting the usage requirements of this zoom lens.

[0135] Figure 12 for Figure 9 The diagram shows the axial aberration curve of the zoom lens at the wide-angle end. The vertical direction represents the normalized aperture, with 0 indicating on the optical axis. The vertex in the perpendicular direction represents the maximum pupil radius. The dominant wavelength is 546.07 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 12It can be seen that the axial aberrations of different wavelengths (0.3–1.0 normalized aperture) are all controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberrations at the wide-angle end, meeting the usage requirements. Furthermore, at pupil positions of 0.5–0.9, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement of clear nighttime imaging and achieving clear images across the entire wavelength range.

[0136] Figure 13 for Figure 9 The modulation transfer function (MJF) curves of the zoom lens at the wide-angle end in the visible and infrared bands are shown. The vertical axis represents the MJF value, and the horizontal axis represents the frequency. The simulated wavelength range is 436 nm to 850 nm, with 546.07 nm as the dominant wavelength. Figure 13 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. The modulation transfer function values ​​in the entire field of view are all greater than 0.45 in the 80lp / mm frequency band, indicating that the image quality of the zoom lens is well controlled at the wide-angle end, which meets the requirements of 4K camera use.

[0137] Figure 14 for Figure 10 The diagram shows the ray fan plots of a zoom lens at different image heights at the telephoto end. In a single plot, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, in which case all rays in that field of view should focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan plot not only reflects monochromatic aberrations at different wavelengths but also indicates the magnitude of transverse chromatic aberration. Figure 14 It can be seen that, at the telephoto end, all wavelengths of this zoom lens closely approximate the horizontal axis in each field of view, indicating that the transverse aberration of each wavelength is well corrected. Furthermore, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good chromatic aberration correction, meeting the usage requirements of this zoom lens.

[0138] Figure 15 for Figure 10 The image shows the axial aberration curve of the zoom lens at the telephoto end. The vertical direction represents the normalized aperture, with 0 indicating it's on the optical axis. The vertex in the perpendicular direction represents the maximum pupil radius. The dominant wavelength is 546.07 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 15 As can be seen, the transverse chromatic aberration at different wavelengths is controlled within a small range, indicating that the zoom lens achieves good control over transverse chromatic aberration at the telephoto end, meeting the application requirements under normal conditions. Furthermore, at the 0.5–0.9 pupil positions, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear nighttime imaging and achieving clear images across the entire wavelength range.

[0139] Figure 16 for Figure 10 The modulation transfer function (MJF) curves of the zoom lens at the telephoto end in the visible and infrared bands are shown. The vertical axis represents the MJF value, and the horizontal axis represents the frequency. The simulated wavelength range is 436 nm to 850 nm, with 546.07 nm as the dominant wavelength. Figure 16 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. The modulation transfer function values ​​in the entire field of view are all greater than 0.45 in the 80lp / mm band, indicating that the image quality of the zoom lens is well controlled at the telephoto end, which meets the requirements of 4K camera use.

[0140] Figure 17 This is a schematic diagram of the structure of a zoom lens at the wide-angle end according to Embodiment 3 of the present invention. Figure 18 yes Figure 17 The diagram shown is a structural schematic of the zoom lens at the telephoto end. (Refer to...) Figure 17 and Figure 18 The parameter design values ​​of each lens in the zoom lens of this embodiment three are shown in Table 10:

[0141] Table 10 shows a design value for each lens in the zoom lens of Example 3.

[0142]

[0143]

[0144] The surface numbers in Table 10 are assigned according to the surface sequence of each lens; where "STO" represents the aperture stop of the zoom lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; "INF" indicates that the surface is flat and the radius of curvature is infinite; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1. The Abbe number represents the dispersion characteristics of the material between the current surface and the next surface. The zoom interval values ​​in Table 10 are shown in Table 11.

[0145] Table 11 shows a design value for the zoom interval of the zoom lens at the wide-angle and telephoto ends in Example 3.

[0146] Wide-angle end telephoto end Zoom interval 1 13.5581 0.6103 Zoom interval 2 13.5581 0.6103 Zoom interval 3 4.5490 0.3019 Zoom interval 4 1.9083 9.4727

[0147] The conicity coefficients of aspherical surfaces can be defined using the following aspherical formulas, but are not limited to the following representations:

[0148] Where Z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis at a height r; c represents the curvature at the vertex of the aspherical surface; k is the fitted conic coefficient; a4, a6, a8, a 10 a 12 For the higher-order aspheric coefficients corresponding to the fourth, sixth, eighth, tenth, and twelfth orders of aspheric surfaces, a i r i These are combined to form higher-order terms for the corresponding aspherical surfaces. The coefficients of the even-order terms for each aspherical surface in Example 3 above are shown in Table 12:

[0149] Table 12 Aspherical parameters of each lens in the zoom lens in Example 3

[0150]

[0151]

[0152] Where -5.700960376265E-05 indicates that the coefficient a4 of surface number 4 is -5.700960376265*10 -5 And so on.

[0153] The parameters of the zoom lens in this embodiment three are shown in Table 13:

[0154] Table 13 Parameter Specifications of the Zoom Lens in Example 3

[0155] Wide-angle end telephoto end Image plane size (mm) Φ7 Φ7 Focal length (mm) 3.28 9.33 Waveband (nm) 436-850 436-850 Total optical length (mm) 50.86 54.17

[0156] Figure 19 for Figure 17 The diagram shows the ray fan plots of a zoom lens at different image heights at the wide-angle end. In a single plot, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, in which case all rays in that field of view should focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan plot not only reflects monochromatic aberration at different wavelengths but also indicates the magnitude of transverse chromatic aberration. Figure 19 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths within the wide-angle field of view, indicating that the transverse aberration of each wavelength is well corrected. Furthermore, the curves for each color do not show significant dispersion, indicating that this zoom lens also provides good correction for chromatic aberration, meeting the usage requirements of this zoom lens.

[0157] Figure 20 for Figure 17The diagram shows the axial aberration curve of the zoom lens at the wide-angle end. The vertical direction represents the normalized aperture, with 0 indicating on the optical axis. The vertex in the perpendicular direction represents the maximum pupil radius. The dominant wavelength is 546.07 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 20 It can be seen that the axial aberrations of different wavelengths (0.3–1.0 normalized aperture) are all controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberrations at the wide-angle end, meeting the usage requirements. Furthermore, at pupil positions of 0.5–0.9, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement of clear nighttime imaging and achieving clear images across the entire wavelength range.

[0158] Figure 21 for Figure 17 The modulation transfer function (MJF) curves of the zoom lens at the wide-angle end in the visible and infrared bands are shown. The vertical axis represents the MJF value, and the horizontal axis represents the frequency. The simulated wavelength range is 436 nm to 850 nm, with 546.07 nm as the dominant wavelength. Figure 21 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. The modulation transfer function values ​​in the entire field of view are all greater than 0.5 in the 80lp / mm band, indicating that the image quality of this zoom lens in the visible light band at the wide-angle end is well controlled, which meets the requirements of 4K camera use.

[0159] Figure 22 for Figure 18 The diagram shows the ray fan plots of a zoom lens at different image heights at the telephoto end. In a single plot, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, in which case all rays in that field of view should focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan plot not only reflects monochromatic aberrations at different wavelengths but also indicates the magnitude of transverse chromatic aberration. Figure 22 It can be seen that, at the telephoto end, all wavelengths of this zoom lens closely approximate the horizontal axis in each field of view, indicating that the transverse aberration of each wavelength is well corrected. Furthermore, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good chromatic aberration correction, meeting the usage requirements of this zoom lens.

[0160] Figure 23 for Figure 18 The image shows the axial aberration curve of the zoom lens at the telephoto end. The vertical direction represents the normalized aperture, with 0 indicating it's on the optical axis. The vertex in the perpendicular direction represents the maximum pupil radius. The dominant wavelength is 546.07 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 23As can be seen, the transverse chromatic aberration at different wavelengths is controlled within a small range, indicating that the zoom lens achieves good control over transverse chromatic aberration at the telephoto end, meeting the application requirements under normal conditions. Furthermore, at the 0.5–0.9 pupil positions, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear nighttime imaging and achieving clear images across the entire wavelength range.

[0161] Figure 24 for Figure 18 The modulation transfer function (MJF) curves of the zoom lens at the telephoto end in the visible and infrared bands are shown. The vertical axis represents the MJF value, and the horizontal axis represents the frequency. The simulated wavelength range is 436 nm to 850 nm, with 546.07 nm as the dominant wavelength. Figure 24 It can be seen that the modulation transfer function values ​​of each frequency under different fields of view are all controlled within a reasonable range. The modulation transfer function values ​​in the entire field of view are all greater than 0.5 in the 80lp / mm band, indicating that the image quality of the zoom lens in the visible light band at the telephoto end is well controlled, which meets the requirements of 4K camera use.

[0162] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A zoom lens, characterized in that, It includes a focusing lens group with negative optical power, a first zoom lens group with positive optical power, an aperture stop, and a second zoom lens group with positive optical power, arranged sequentially from the object side to the image side along the optical axis; The focusing lens group includes a first lens with negative optical power, a second lens with negative optical power, and a third lens with positive optical power; The first zoom lens group includes a fourth lens with positive optical power; The second zoom lens group includes a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, a ninth lens with negative optical power, and a tenth lens with positive optical power. When the zoom lens switches between the wide-angle end and the telephoto end, the focusing lens group, the first zoom lens group, and the second zoom lens group move synchronously along the optical axis.

2. The zoom lens according to claim 1, characterized in that, The focusing lens group, the first zoom lens group, and the second zoom lens group satisfy the following relationship: -2.56≤FG1 / FW≤-2.50; 1684.80≤FG2 / FW≤1903.58; 3.09≤FG3 / FW≤3.15; Wherein, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the first zoom lens group, FG3 is the focal length of the second zoom lens group, and FW is the focal length of the wide-angle end of the zoom lens.

3. The zoom lens according to claim 1, characterized in that, The focusing lens group, the first zoom lens group, and the second zoom lens group satisfy the following relationship: -0.90≤FG1 / FT≤-0.89; 592.3≤FG2 / FT≤667.17; 1.10≤FG3 / FT≤1.11; Wherein, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the first zoom lens group, FG3 is the focal length of the second zoom lens group, and FT is the focal length of the telephoto end of the zoom lens.

4. The zoom lens according to claim 1, characterized in that, The first lens, the sixth lens, the seventh lens, and the eighth lens are all glass spherical lenses; the second lens, the third lens, the fourth lens, the ninth lens, and the tenth lens are plastic aspherical lenses; and the fifth lens is a glass aspherical lens.

5. The zoom lens according to claim 4, characterized in that, The fourth lens, the fifth lens, the eighth lens, and the ninth lens satisfy the following requirements: 1.533≤nd4≤1.545; 55.699≤vd4≤56.003; 1.497≤nd5≤1.498; 81.352≤vd5≤90.506; 1.466≤nd8≤1.498;81.223≤vd8≤81.637; 1.640≤nd9≤1.661;20.389≤vd9≤23.492; Wherein, nd4, nd5, nd8, and nd9 are the refractive indices of the fourth lens, the fifth lens, the eighth lens, and the ninth lens, respectively, and vd4, vd5, vd8, and vd9 are the Abbe numbers of the fourth lens, the fifth lens, the eighth lens, and the ninth lens, respectively.

6. The zoom lens according to claim 1, characterized in that, The sixth lens, the seventh lens, and the eighth lens are cemented together in sequence to form a three-layer cemented lens group.

7. The zoom lens according to claim 6, characterized in that, The triplexed lens group satisfies the following relationship: 4.50≤F678 / FG3≤5.39; Wherein, F678 is the focal length of the three-cement lens group, and FG3 is the focal length of the second zoom lens group.

8. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies the following relationship: 2.82≤FT / FW≤2.85; Wherein, FW is the focal length at the wide-angle end of the zoom lens, and FT is the focal length at the telephoto end of the zoom lens.

9. The zoom lens according to claim 1, characterized in that, The focusing lens group, the first zoom lens group, and the second zoom lens group satisfy the following relationship: 0.34≤S2 / S1≤0.35; 0.79≤S3 / S1≤0.84; Wherein, S1 is the maximum movable distance of the focusing lens group, S2 is the maximum movable distance of the first zoom lens group, and S3 is the maximum movable distance of the second zoom lens group.

10. The zoom lens according to claim 1, characterized in that, The zoom lens, the first zoom lens group, and the second zoom lens group satisfy the following relationship: 15.93≤TTL / S2≤17.01; 7.05≤TTL / S3≤7.16; Wherein, TTL is the total optical length of the telephoto end of the zoom lens, S2 is the maximum movable distance of the first zoom lens group, and S3 is the maximum movable distance of the second zoom lens group.

Images