Zoom optical system

Abstract

The invention discloses a zoom optical system, and relates to the technical field of optical systems, and the zoom optical system is provided with an object side and an image side which are correspondingly arranged along the direction of an optical axis. The zoom optical system comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with negative focal power, a fifth lens group with negative focal power, a sixth lens group with positive focal power and an image surface which are sequentially arranged from an object side to an image side, the second lens group, the third lens group, the fourth lens group and the sixth lens group are all movably arranged in the extension direction of the optical axis, the second lens group, the third lens group and the fourth lens group are used for zooming, the sixth lens group is used for focusing, and a light focus assembly of the zooming optical system is controlled within 350mm. Through the arrangement, the optical distortion range of the zoom optical system is controlled between-1.85% and 0.43%, so that the imaging quality of the zoom optical system is ensured, and the effects of large magnification, small size, large angle, small distortion and high imaging quality are achieved.

Description

Technical Field

[0001] This invention relates to the field of optical system technology, and in particular to a zoom optical system. Background Technology

[0002] With the continuous development of optical technology, optical imaging lenses have become crucial components for information acquisition. As the application fields of lenses continue to expand, the demand for high-definition continuous zoom lenses is increasing daily. Currently, high-definition continuous zoom lenses are widely used in photography, biology, medicine, materials science, surveillance, early warning systems, microfabrication, and precision machining. Zoom lenses have been used for decades, but at high zoom ratios, they generally suffer from low resolution and large size, failing to meet the application requirements of high-definition imaging. Summary of the Invention

[0003] The main objective of this invention is to propose a zoom optical system that aims to improve the problems of existing lenses having low resolution, large size, and inability to meet the requirements of high-definition imaging.

[0004] To achieve the above objectives, the zoom optical system proposed in this invention has an object side and an image side arranged correspondingly along the optical axis. The zoom optical system includes a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with negative optical power, a fifth lens group with negative optical power, a sixth lens group with positive optical power, and an image plane arranged sequentially from the object side to the image side. The second lens group, the third lens group, the fourth lens group, and the sixth lens group are all movably arranged in the extension direction of the optical axis. The second lens group, the third lens group, and the fourth lens group are used for zooming, and the sixth lens group is used for focusing. The optical zoom assembly of the zoom optical system is controlled within 350mm. Wherein, the focal length of the zoom optical system at the wide-angle end is fw, and the focal length at the telephoto end is ft. The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the focal length of the fifth lens group is f5, and the focal length of the sixth lens group is f6. The zoom optical system satisfies the following conditions: fw = 16mm, and ft = 840mm, and 0.074 ≤ fw / f1 ≤ 0.100, and -0.511 ≤ fw / f2 ≤ -0.378, and 0.258 ≤ fw / f3 ≤ 0.349, and -0.010 ≤ fw / f4 ≤ -0.007, and -0.480 ≤ fw / f5 ≤ -0.355, and 0.421 ≤ fw / f6 ≤ 0.570.

[0005] In one embodiment, the first lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side to the image side. The first lens has a negative optical power, the second lens has a positive optical power, the third lens has a positive optical power, the fourth lens has a negative optical power, and the fifth lens has a positive optical power. The first lens and the second lens are cemented together, and the fourth lens and the fifth lens are cemented together. The focal length of the first lens is f11, the focal length of the second lens is f12, the focal length of the third lens is f13, the focal length of the fourth lens is f14, and the focal length of the fifth lens is f15, wherein -0.275≤f1 / f11≤-0.203, and 0.732≤f1 / f12≤0.990, and 0.271≤f1 / f13≤0.367, and -1.212≤f1 / f14≤-0.896, and 0.969≤f1 / f15≤1.311.

[0006] In one embodiment, the aperture of the second lens is øL12, and the total optical length of the zoom optical system is TTL, wherein 0.234 < øL12 / TTL < 0.498.

[0007] In one embodiment, the second lens group includes a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially from the object side to the image side. The optical power of the sixth lens is negative, the optical power of the seventh lens is negative, the optical power of the eighth lens is negative, and the optical power of the ninth lens is positive. The eighth lens and the ninth lens are cemented together. The focal length of the sixth lens is f21, the focal length of the seventh lens is f22, the focal length of the eighth lens is f23, and the focal length of the ninth lens is f24, wherein 0.209≤f2 / f21≤0.283, 0.577≤f2 / f22≤0.780, 0.541≤f2 / f23≤0.732, and -0.675≤f2 / f24≤-0.499.

[0008] In one embodiment, the third lens group includes a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially from the object side to the image side. The eleventh lens has a positive optical power, the twelfth lens has a positive optical power, the thirteenth lens has a negative optical power, and the fourteenth lens has a positive optical power. The twelfth lens and the thirteenth lens are cemented together. The focal length of the tenth lens is f31, the focal length of the eleventh lens is f32, the focal length of the twelfth lens is f33, and the focal length of the thirteenth lens is f34, wherein 0.323≤f3 / f31≤0.437, and 0.468≤f3 / f32≤0.633, and -0.762≤f3 / f33≤-0.563, and 0.620≤f3 / f34≤0.838.

[0009] In one embodiment, the fourth lens group includes a fourteenth lens and a fifteenth lens arranged sequentially from the object side to the image side. The fourteenth lens has a positive optical power, and the fifteenth lens has a negative optical power. The fourteenth lens and the fifteenth lens are cemented together. The focal length of the fourteenth lens is f41, and the optical power of the fifteenth lens is f42, wherein -6.777≤f4 / f41≤-5.009, and 5.659≤f4 / f42≤7.656.

[0010] In one embodiment, the fifth lens group includes a sixteenth lens and a seventeenth lens arranged sequentially from the object side to the image side. The sixteenth lens has a negative optical power, the seventeenth lens has a positive optical power, and the sixteenth lens and the seventeenth lens are cemented together. The focal length of the sixteenth lens is f51, and the focal length of the seventeenth lens is f52, wherein 1.742≤f5 / f51≤2.356, and -1.285≤f5 / f52≤-0.950.

[0011] In one embodiment, the sixth lens group includes an eighteenth lens, a nineteenth lens, a twentieth lens, a twenty-first lens, a twenty-second lens, and a twenty-third lens arranged sequentially from the object side to the image side. The eighteenth lens has a positive optical power, the nineteenth lens has a negative optical power, the twentieth lens has a negative optical power, the twenty-first lens has a positive optical power, the twenty-third lens has a negative optical power, and the eighteenth, nineteenth, and twentieth lenses are cemented together to form a three-layer cemented joint. The twenty-first and twenty-second lenses are cemented together. The focal length of the eighteenth lens is f61, the focal length of the nineteenth lens is f62, the focal length of the twentieth lens is f63, the focal length of the twenty-first lens is f64, the focal length of the twenty-second lens is f65, and the focal length of the twenty-third lens is f66, wherein 0.525≤f6 / f61≤0.710, and -1.612≤f6 / f62≤-1.191, and -0.439≤f6 / f63≤-0.324, and 1.535≤f6 / f64≤2.077, and -1.841≤f6 / f65≤-1.360, and 1.169≤f6 / f66≤1.582.

[0012] In one embodiment, the total optical length of the zoom optical system is TTL, the displacement of the second lens group is ΔZ1(WT), 0.218 < ΔZ1(WT) / TTL < 0.283; and / or, The total optical length of the zoom optical system is TTL, and the displacement of the third lens group is ΔZ2(WT), where 0.15 < ΔZ2(WT) / TTL < 0.194; and / or, The total optical length of the zoom optical system is TTL, and the displacement of the fourth lens group is ΔZ3(WT), where 0.151 < ΔZ3(WT) / TTL < 0.19; and / or, The total optical length of the zoom optical system is TTL, and the displacement of the sixth lens group is ΔZ4(WT), where 0.085 < ΔF(WT) / TTL < 0.11.

[0013] In one embodiment, the zoom optical system further includes an aperture stop disposed between the third lens group and the fourth lens group. The distance between the aperture stop and the image plane is L, and the total optical length of the zoom optical system is TTL, 0.442. <L / TTL<0.574。

[0014] In the technical solution of this invention, the first and fifth lens groups are set as fixed lens groups, while only the second, third, fourth, and sixth lens groups are set as movable lens groups. Thus, the second, third, and fourth lens groups move along the optical axis to zoom the zoom optical system. Meanwhile, the sixth lens group moves in coordination along the optical axis to focus the zoom optical system, ensuring clear imaging of the image plane during zooming. By conditionally limiting the ratio of the focal length of the six lens groups to the focal length of the zoom optical system at the wide-angle end, and by rationally matching the optical powers of the six lens groups, the total optical length of the zoom optical system is controlled within 350mm, and the optical distortion range is controlled between -1.85% and 0.43%, thereby ensuring the imaging quality of the zoom optical system and achieving the effects of high magnification, small size, large angle, low distortion, and high imaging quality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a structure of the zoom optical system provided by the present invention at the wide-angle end; Figure 2 This is a schematic diagram of a mid-focal-length embodiment of the zoom optical system provided by the present invention. Figure 3 This is a schematic diagram of a telephoto end embodiment of the zoom optical system provided by the present invention. Figure 4 A schematic diagram of the zoom optical system provided by the present invention with an MTF of 160 lp / mm. Figure 5 This is a schematic diagram of the MTF vs Field of the zoom optical system provided by the present invention; Figure 6 A schematic diagram of the zoom optical system provided by the present invention at 120 lp / mm (defocus MTF); Figure 7 A schematic diagram of the FCD for the zoom optical system provided by this invention; Figure 8 A schematic diagram of the zoom optical system provided by this invention; Figure 9This is a schematic diagram of the LON of the zoom optical system provided by the present invention; Figure 10 This is a schematic diagram of the LAT of the zoom optical system provided by the present invention.

[0017] Explanation of icon numbers: 100. Zoom optical system; 1. First lens group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 15. Fifth lens; 2. Second lens group; 21. Sixth lens; 22. Seventh lens; 23. Eighth lens; 24. Ninth lens; 3. Third lens group; 31. Tenth lens; 32. Eleventh lens; 33. Twelfth lens; 34. Thirteenth lens; 4. Fourth lens group; 41. Fourteenth lens; 42. Fifteenth lens; 5. Fifth lens group; 51. Sixteenth lens; 52. Seventeenth lens; 6. Sixth lens group; 61. Eighteenth lens; 62. Nineteenth lens; 63. Twentieth lens; 64. Twenty-first lens; 65. Twenty-second lens; 66. Twenty-third lens; 7. Image plane; 8. Aperture; 9. Filter.

[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] This invention proposes a zoom optical system designed to improve the problems of existing lenses having low resolution, large size, and inability to meet the requirements of high-definition imaging.

[0023] Please see Figures 1 to 3 In one embodiment of the present invention, the zoom optical system 100 has an object side and an image side correspondingly arranged along the optical axis. The zoom optical system 100 includes a first lens group 1 with positive optical power, a second lens group 2 with negative optical power, a third lens group 3 with positive optical power, a fourth lens group 4 with negative optical power, a fifth lens group 5 with negative optical power, a sixth lens group 6 with positive optical power, and an image plane 7, arranged sequentially from the object side to the image side. The second lens group 2, the third lens group 3, the fourth lens group 4, and the sixth lens group 6 are all movably arranged in the extension direction of the optical axis. The second lens group 2, the third lens group 3, and the fourth lens group 4 are used for zooming, and the sixth lens group 6 is used for focusing. The optical zoom assembly of the zoom optical system 100 is controlled within 350mm. The zoom optical system 100 has a focal length of fw at the wide-angle end and a focal length of ft at the telephoto end. The focal length of the first lens group 1 is f1, the focal length of the second lens group 2 is f2, the focal length of the third lens group 3 is f3, the focal length of the fourth lens group 4 is f4, the focal length of the fifth lens group 5 is f5, and the focal length of the sixth lens group 6 is f6. The zoom optical system 100 satisfies the following conditions: fw = 16mm, and 0.074 ≤ fw / f1 ≤ 0.100, and -0.511 ≤ fw / f2 ≤ -0.378, and 0.258 ≤ fw / f3 ≤ 0.349, and -0.010 ≤ fw / f4 ≤ -0.007, and -0.480 ≤ fw / f5 ≤ -0.355, and 0.421 ≤ fw / f6 ≤ 0.570.

[0024] In the technical solution of this invention, the first lens group 1 and the fifth lens group 5 are set as fixed lens groups, while only the second lens group 2, the third lens group 3, the fourth lens group 4, and the sixth lens group 6 are set as movable lens groups. Thus, the second lens group 2, the third lens group 3, and the fourth lens group 4 move along the optical axis to zoom the zoom optical system 100. At this time, the sixth lens group 6 moves in coordination along the optical axis to focus the zoom optical system 100, enabling the zoom optical system 100 to focus during the zoom process. To maintain the clarity of the image plane 7, the zoom optical system 100 is conditionally limited by the ratio of the focal length of the six lens groups to the focal length of the zoom optical system 100 at the wide-angle end, and by reasonably matching the optical power of the six lens groups. This allows the total optical length of the zoom optical system 100 to be controlled within 350mm, and the optical distortion range of the zoom optical system 100 to be controlled between -1.85% and 0.43%. This ensures the imaging quality of the zoom optical system 100, achieving the effects of high magnification, small size, large angle, small distortion, and high imaging quality.

[0025] In this invention, when the second lens group 2, the third lens group 3, and the fourth lens group 4 move along the optical axis, the sixth lens group 6 moves simultaneously along the optical axis. This arrangement ensures that when the second lens group 2, the third lens group 3, and the fourth lens group 4 move along the optical axis to zoom the zoom optical system 100, the sixth lens group 6 can perform real-time focusing on the zoom optical system 100. This allows the image plane 7 to maintain clear imaging during the zoom process, thereby avoiding image blurring and defocusing caused by the movement of the second lens group 2, the third lens group 3, and the fourth lens group 4 along the optical axis to zoom the zoom optical system 100. This not only improves the operational flexibility of the zoom optical system 100 but also significantly enhances its imaging stability and reliability.

[0026] It is understood that, in this invention, during the movement of the second mirror group 2, the third mirror group 3, the fourth mirror group 4, and the sixth mirror group 6 along the extension direction of the optical axis, each of these mirror groups can move in various different ways. For example, in one embodiment of this invention, the second mirror group 2, the third mirror group 3, the fourth mirror group 4, and the sixth mirror group 6 can be configured to be driven by a drive motor, that is, a single drive motor is used to drive one mirror group to move along the optical axis. With this configuration, the second mirror group 2, the third mirror group 3, the fourth mirror group 4, and the sixth mirror group 6 can move independently along the extension direction of the optical axis.

[0027] In another embodiment of the present invention, the second mirror group 2, the third mirror group 3, the fourth mirror group 4, and the sixth mirror group 6 can also be configured to be driven by the same drive motor. In this case, it is only necessary to ensure that there is a difference in the transmission ratio between the different mirror groups and the drive motor. With this configuration, when the drive motor outputs driving force, the driving force of the drive motor can be transmitted to the second mirror group 2, the third mirror group 3, the fourth mirror group 4, and the sixth mirror group 6 respectively. In this way, the linkage activity of the second mirror group 2, the third mirror group 3, the fourth mirror group 4, and the sixth mirror group 6 can be realized.

[0028] In another embodiment of the present invention, the second mirror group 2, the third mirror group 3, the fourth mirror group 4 and the sixth mirror group 6 can also be configured to be manually driven to move along the optical axis extension direction. Specifically, in actual settings, they can be selected according to needs, and the present invention does not limit them.

[0029] It is also understood that the present invention does not limit the specific ratio of the focal length of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15 and the sixth lens 21 to the focal length of the zoom optical system 100. In the present invention, the ratio of the focal length of each lens group to the focal length of the zoom optical system 100 can be selected according to the actual situation.

[0030] For example, in one embodiment of the present invention, the focal length of the first lens group 1 can be set to 188.95mm, the focal length of the second lens group 2 can be set to -36.85mm, the focal length of the third lens group 3 can be set to 53.92mm, the focal length of the fourth lens group 4 can be set to -1937.07mm, the focal length of the fifth lens group 5 can be set to -39.22mm, and the focal length of the sixth lens group 6 can be set to 33.02mm. With this configuration, since the focal length of the zoom optical system 100 at the wide-angle end is 16mm, the ratio of the focal length of the zoom optical system 100 at the wide-angle end to the focal length of the first lens group 1 is fw / f1 = 0.085, the ratio of the focal length of the zoom optical system 100 at the wide-angle end to the focal length of the second lens group 2 is fw / f2 = -0.434, and the ratio of the focal length of the zoom optical system 100 at the wide-angle end to the focal length of the third lens group 1 is... The focal length ratio of the zoom optical system 100 at the wide-angle end is fw / f3 = 0.297. The focal length ratio of the zoom optical system 100 at the wide-angle end to the focal length of the fourth lens group 4 is fw / f4 = -0.008. The focal length ratio of the zoom optical system 100 at the wide-angle end to the focal length of the fifth lens group 5 is fw / f5 = -0.408. The focal length ratio of the zoom optical system 100 at the wide-angle end to the focal length of the sixth lens group 6 is fw / f6 = 0.485. Thus, the focal length ratios of the zoom optical system 100 at the wide-angle end with the first lens group 1, the second lens group 2, the third lens group 3, the fourth lens group 4, the fifth lens group 5, and the sixth lens group 6 are all within the corresponding ratio range, thereby ensuring that the zoom optical system 100 maintains good image quality during zooming.

[0031] In a further embodiment of the present invention, to ensure successful imaging of the zoom optical system 100 and to ensure the image sharpness of the zoom optical system 100, the first lens group 1 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, and a fifth lens 15 arranged sequentially from the object side to the image side. The optical power of the first lens 11 is negative, the optical power of the second lens 12 is positive, the optical power of the third lens 13 is positive, the optical power of the fourth lens 14 is negative, and the optical power of the fifth lens 15 is positive. Furthermore, the first lens 11 and the second lens 12 are cemented together. The fourth lens 14 and the fifth lens 15 are cemented together. The focal length of the first lens 11 is f11, the focal length of the second lens 12 is f12, the focal length of the third lens 13 is f13, the focal length of the fourth lens 14 is f14, and the focal length of the fifth lens 15 is f15. Wherein, -0.275≤f1 / f11≤-0.203, and 0.732≤f1 / f12≤0.990, and 0.271≤f1 / f13≤0.367, and -1.212≤f1 / f14≤-0.896, and 0.969≤f1 / f15≤1.311.

[0032] In this embodiment, the present invention does not limit the specific values ​​of the focal lengths of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15. In this embodiment, the specific values ​​of the focal lengths of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 can also be set to any value within the range. In actual settings, they can be selected according to the requirements.

[0033] For example, in one embodiment of the present invention, the focal length of the first lens group 1 can be set to 188.95mm. In this case, the focal length of the first lens 11 can be set to -790.43mm, the focal length of the second lens 12 can be set to 219.46mm, the focal length of the third lens 13 can be set to 592.17mm, the focal length of the fourth lens 14 can be set to -179.33mm, and the focal length of the fifth lens 15 can be set to 165.7mm. With this configuration, in this… In this embodiment, the focal length ratio of the first lens group 1 to the first lens 11 is f1 / f11 = -0.239, the focal length ratio of the first lens group 1 to the second lens 12 is f1 / f12 = 0.861, the focal length ratio of the first lens group 1 to the third lens 13 is f1 / f13 = 0.319, the focal length ratio of the first lens group 1 to the fourth lens 14 is f1 / f14 = -1.054, and the focal length ratio of the first lens group 1 to the fifth lens 15 is f1 / f15 = 1.140. In this embodiment, the focal length ratios of the first lens group 1 to the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all within their respective ranges, ensuring a reasonable distribution of the optical power of the first lens group 1, thereby helping to improve the imaging quality of the zoom optical system 100.

[0034] Furthermore, in this embodiment, setting the optical power of the first lens 11 to a negative value can further help the zoom optical system 100 collect light and correct aberrations.

[0035] It should also be noted that in this embodiment, the first lens 11 and the second lens 12 are cemented together, and the fourth lens 14 and the fifth lens 15 are cemented together. This arrangement can correct the chromatic aberration of the zoom optical system 100. Simultaneously, the cemented connection can reduce light energy loss, increase image clarity, and protect the scale surface, thereby further optimizing the manufacturing process to meet design requirements. Therefore, the proper use of cemented components allows optical elements to improve the image quality of the optical system.

[0036] Furthermore, in this invention, the aperture of the second lens 12 is not constant. The size of the aperture of the second lens 12 can be adjusted according to the actual setup requirements of the zoom optical system 100. In one embodiment of this invention, the aperture of the second lens 12 is øL12, and the total optical length of the zoom optical system 100 is TTL, where 0.234 < øL12 / TTL < 0.498. With this setting, when the ratio of the aperture size of the second lens 12 to the total optical length of the zoom optical system 100 is within the corresponding range, the aperture size of the second lens 12 can be ensured to be reasonable, thereby helping to improve the overall performance of the zoom optical system 100. Specifically, if the aperture size of the second lens 12 is too small, it may cause excessive restriction of light transmission, affecting the brightness and clarity of the image; while if the aperture size of the second lens 12 is too large, it may increase the complexity of the zoom optical system 100 and cause the system to become bulky due to the excessive aperture, while also potentially introducing more phase aberrations.

[0037] Similarly, to achieve successful imaging of the zoom optical system 100 and ensure its imaging quality, in another embodiment of the present invention, the second lens group 2 includes a sixth lens 21, a seventh lens 22, an eighth lens 23, and a ninth lens 24 arranged sequentially from the object side to the image side. The optical power of the sixth lens 21 is negative, the optical power of the seventh lens 22 is negative, the optical power of the eighth lens 23 is negative, and the optical power of the ninth lens 24 is positive. Furthermore, the optical power of the eighth lens 23 is... The lens 21 is cemented to the ninth lens 24. The focal length of the sixth lens 21 is f21, the focal length of the seventh lens 22 is f22, the focal length of the eighth lens 23 is f23, and the focal length of the ninth lens 24 is f24. Wherein, 0.209≤f2 / f21≤0.283, 0.577≤f2 / f22≤0.780, 0.541≤f2 / f23≤0.732, and -0.675≤f2 / f24≤-0.499.

[0038] Similarly, the present invention does not limit the specific focal length values ​​of the sixth lens 21, the seventh lens 22, the eighth lens 23, and the ninth lens 24. In the embodiments of the present invention, the specific focal length values ​​of the sixth lens 21, the seventh lens 22, the eighth lens 23, and the ninth lens 24 can be set to any value within the corresponding range, and the present invention does not limit this.

[0039] For example, in one embodiment of the present invention, the focal length of the second lens group 2 can be set to -36.85mm, the focal length of the sixth lens 21 can be set to -149.66mm, the focal length of the seventh lens 22 can be set to -54.31mm, the focal length of the eighth lens 23 can be set to -57.87mm, and the focal length of the ninth lens 24 can be set to 62.76mm. With this configuration, in this embodiment, the focal length ratio of the second lens group 2 to the sixth lens 21 is f2 / f21 = 0.246, the focal length ratio of the second lens group 2 to the seventh lens 22 is f2 / f22 = 0.679, the focal length ratio of the second lens group 2 to the eighth lens 23 is f2 / f23 = 0.637, and the focal length ratio of the second lens group 2 to the ninth lens 24 is f2 / f24 = -0.587. In this embodiment, the specific focal length ratios of the second lens group 2 with the sixth lens 21, the seventh lens 22, the eighth lens 23, and the ninth lens 24 are all within the corresponding ratio range, thereby ensuring that the optical power of the second lens group 2 is reasonably allocated in the zoom optical system 100, thereby improving the imaging performance of the zoom optical system 100.

[0040] It should be further explained that in the second lens group 2, the eighth lens 23 and the ninth lens 24 are cemented together. In this way, the cemented connection of the eighth lens 23 and the ninth lens 24 can further correct the chromatic aberration of the zoom optical system 100. At the same time, the cemented connection can also reduce light energy loss, increase image clarity, and protect the scale surface, thereby further improving the image quality of the zoom optical system 100.

[0041] Furthermore, in another embodiment of the present invention, the third lens group 3 includes a tenth lens 31, an eleventh lens 32, a twelfth lens 33, and a thirteenth lens 34 arranged sequentially from the object side to the image side. The eleventh lens 32 has a positive optical power, the twelfth lens 33 has a positive optical power, the thirteenth lens 34 has a negative optical power, and the fourteenth lens 41 has a positive optical power. The twelfth lens 33 and the thirteenth lens 34 are cemented together. As configured, the focal length of the tenth lens 31 is f31, the focal length of the eleventh lens 32 is f32, the focal length of the twelfth lens 33 is f33, and the focal length of the thirteenth lens 34 is f34, wherein 0.323≤f3 / f31≤0.437, and 0.468≤f3 / f32≤0.633, and -0.762≤f3 / f33≤-0.563, and 0.620≤f3 / f34≤0.838.

[0042] It is understood that the present invention does not limit the specific values ​​of the focal lengths of the tenth lens 31, the eleventh lens 32, the twelfth lens 33, and the thirteenth lens 34. In the embodiments of the present invention, the focal lengths of the tenth lens 31, the eleventh lens 32, the twelfth lens 33, and the thirteenth lens 34 can be set to any value within the corresponding range. In actual settings, they can be selected according to requirements, and the present invention does not limit them.

[0043] In a specific embodiment of the present invention, the focal length of the third lens group 3 can be set to 53.92 mm. In this case, the focal length of the tenth lens 31 can be set to 141.75 mm, the focal length of the eleventh lens 32 can be set to 97.97 mm, the focal length of the twelfth lens 33 can be set to -81.42 mm, and the focal length of the thirteenth lens 34 can be set to 73.98 mm. With this configuration, the focal length ratio of the third lens group 3 to the tenth lens 31 is f3 / f31 = 0.380, the focal length ratio of the third lens group 3 to the eleventh lens 32 is f3 / f32 = 0.550, the focal length ratio of the third lens group 3 to the twelfth lens 33 is f3 / f33 = -0.662, and the focal length ratio of the third lens group 3 to the thirteenth lens 34 is f3 / f34 = 0.729. In this embodiment, the focal length ratios of the third lens group 3, the tenth lens 31, the eleventh lens 32, the twelfth lens 33, and the thirteenth lens 34 are all within the corresponding ratio range, thereby ensuring the reasonable allocation of optical power of the third lens group 3 in the zoom optical system 100, and thus ensuring the imaging performance of the zoom optical system 100.

[0044] It should also be noted that, in this embodiment, the cemented connection between the twelfth lens 33 and the thirteenth lens 34 also serves to correct chromatic aberration, reduce light energy loss, and increase image clarity, which is of great significance for improving the overall performance of the zoom optical system 100.

[0045] Furthermore, the present invention does not limit the specific lens form or number of lenses in the fourth lens group 4. In one embodiment of the present invention, the fourth lens group 4 includes a fourteenth lens 41 and a fifteenth lens 42 arranged sequentially from the object side to the image side. The optical power of the fourteenth lens 41 is positive, and the optical power of the fifteenth lens 42 is negative. The fourteenth lens 41 and the fifteenth lens 42 are cemented together. The focal length of the fourteenth lens 41 is f41, and the optical power of the fifteenth lens 42 is f42, wherein -6.777≤f4 / f41≤-5.009, and 5.659≤f4 / f42≤7.656. The present invention does not limit the specific values ​​of the focal lengths of the fourteenth lens 41 and the fifteenth lens 42. In embodiments of the present invention, the specific values ​​of the focal lengths of the fourteenth lens 41 and the fifteenth lens 42 can also be set to any value within a range, and the present invention does not impose any restrictions on this.

[0046] For example, in one embodiment of the present invention, the focal length of the fourth lens group 4 can be set to -1937.07 mm. In this case, the focal length of the fourteenth lens 41 can be set to 328.69 mm, and the focal length of the fifteenth lens 42 can be set to -290.96 mm. With this configuration, in this embodiment, the focal length ratio of the fourth lens group 4 to the fourteenth lens 41 is f4 / f41 = -5.893, and the focal length ratio of the fourth lens group 4 to the fifteenth lens 42 is f4 / f42 = 6.658. The focal length ratios of the fourth lens group 4 to both the fourteenth and fifteenth lenses are within their respective ranges, thereby ensuring a reasonable distribution of optical power in the zoom optical system 100 and also guaranteeing the imaging quality of the zoom optical system 100.

[0047] It should also be noted that in this embodiment, the fourteenth lens 41 and the fifteenth lens 42 are cemented together to ensure that they can correct chromatic aberration, reduce light energy loss, and increase image clarity. This is of great significance for improving the overall performance of the zoom optical system 100.

[0048] Furthermore, this invention does not limit the specific lens form or number of lenses in the fifth lens group 5. In this invention, the fifth lens group 5 includes a sixteenth lens 51 and a seventeenth lens 52 arranged sequentially from the object side to the image side. The optical power of the sixteenth lens 51 is negative, and the optical power of the seventeenth lens 52 is positive. The sixteenth lens 51 and the seventeenth lens 52 are cemented together. The focal length of the sixteenth lens 51 is f51, and the focal length of the seventeenth lens 52 is f52, wherein 1.742≤f5 / f51≤2.356, and -1.285≤f5 / f52≤-0.950. Similarly, this invention does not limit the specific values ​​of the focal lengths of the sixteenth and seventeenth lenses 52. In the embodiments of this invention, the specific values ​​of the focal lengths of the sixteenth lens 51 and the seventeenth lens 52 can also be set to any value within the range. In actual settings, they can be selected according to the requirements.

[0049] For example, in one embodiment of the present invention, the focal length of the fifth lens group 5 can be set to -39.22mm. In this case, the focal length of the sixteenth lens 51 can be set to -19.14mm, and the focal length of the seventeenth lens 52 can be set to 35.11mm. With this configuration, in this embodiment, the ratio of the focal length of the fifth lens group 5 to that of the sixteenth lens 51 is 2.049, and the ratio of the focal length of the fifth lens group 5 to that of the seventeenth lens 52 is -1.117. In this embodiment, the ratios of the focal lengths of the fifth lens group 5 to those of the sixteenth and seventeenth lenses are also within the corresponding range, ensuring a reasonable distribution of optical power of the fifth lens group 5 in the zoom optical system 100, and thus ensuring the imaging quality of the zoom optical system 100.

[0050] Furthermore, in this invention, the specific number of lenses and the specific surface shape of each lens included in the sixth lens group 6 can also be selected according to actual conditions. For example, in one embodiment of this invention, the sixth lens group 6 can be configured as a combination of six lenses. The sixth lens group 6 includes an eighteenth lens 61, a nineteenth lens 62, a twentieth lens 63, a twenty-first lens 64, a twenty-second lens 65, and a twenty-third lens 66 arranged sequentially from the object side to the image side. The optical power of the eighteenth lens 61 is positive, the optical power of the nineteenth lens 62 is negative, the optical power of the twentieth lens 63 is negative, the optical power of the twenty-first lens 64 is positive, the optical power of the twenty-third lens 66 is negative, and the optical power of the eighteenth lens 61, the nineteenth lens 62, and the twenty-third lens 66 are arranged sequentially from the object side to the image side. The twentieth lens 63 is cemented together to form a three-layer cemented joint. The twentieth lens 64 and the twentieth lens 65 are cemented together. The focal length of the eighteenth lens 61 is f61, the focal length of the nineteenth lens 62 is f62, the focal length of the twentieth lens 63 is f63, the focal length of the twenty-first lens 64 is f64, the focal length of the twenty-second lens 65 is f65, and the focal length of the twenty-third lens 66 is f66. Wherein, 0.525≤f6 / f61≤0.710, and -1.612≤f6 / f62≤-1.191, and -0.439≤f6 / f63≤-0.324, and 1.535≤f6 / f64≤2.077, and -1.841≤f6 / f65≤-1.360, and 1.169≤f6 / f66≤1.582.

[0051] In this embodiment, the specific focal lengths of the eighteenth lens 61, the nineteenth lens 62, the twentieth lens 63, the twenty-first lens 64, the twenty-second lens 65, and the twenty-third lens 66 can be selected according to actual conditions. In actual setup, it is only necessary to ensure that the focal lengths of the six lenses are matched so that the ratio of the focal length of the zoom optical system 100 at the wide-angle end to the focal length of the sixth lens group 6 is within the corresponding ratio range.

[0052] For example, in a specific embodiment of the present invention, the focal length of the sixth lens group 6 can be set to 33.02 mm. In this case, the focal length of the eighteenth lens 61 can be set to 53.45 mm, the focal length of the nineteenth lens 62 can be set to -23.56 mm, the focal length of the twentieth lens 63 can be set to -86.55 mm, the focal length of the twenty-first lens 64 can be set to 18.28 mm, the focal length of the twenty-second lens 65 can be set to -20.63 mm, and the focal length of the twenty-third lens 66 can be set to 24.01 mm. With this configuration, the focal length ratio of the sixth lens group 6 to the eighteenth lens 61 is f6 / f61=0.618, the focal length ratio of the sixth lens group 6 to the nineteenth lens 62 is f6 / f62=-1.402, the focal length ratio of the sixth lens group 6 to the twentieth lens 63 is f6 / f63=-0.382, the focal length ratio of the sixth lens group 6 to the twenty-first lens 64 is f6 / f64=1.806, the focal length ratio of the sixth lens group 6 to the twenty-second lens 65 is f6 / f65=-1.601, and the focal length ratio of the sixth lens group 6 to the twenty-third lens 66 is f6 / f66=1.375. In this embodiment, the ratio of the focal length of the sixth lens group 6 to that of the aforementioned lens is also within the corresponding ratio range, so as to ensure the reasonable allocation of the optical power of the sixth lens group 6 in the zoom optical system 100, and thus ensure the imaging quality of the zoom optical system 100.

[0053] It should be further explained that, in this embodiment, the eighteenth lens 61, the nineteenth lens 62, and the twentieth lens 63 are cemented together to form a three-ply assembly, thereby further correcting the chromatic aberration of the zoom optical system 100, while reducing light energy loss, increasing image clarity, protecting the scale surface, and thus further optimizing the processing flow to meet design requirements.

[0054] Furthermore, in this embodiment, the 21st lens 64 and the 22nd lens 65 are also bonded together, which can further correct chromatic aberration and reduce light loss, thereby increasing image clarity.

[0055] Furthermore, in this invention, it is also necessary to ensure the displacement of the second lens group 2, the third lens group 3, the fourth lens group 4, and the sixth lens group 6. That is, the displacement of the second lens group 2, the third lens group 3, the fourth lens group 4, and the sixth lens group 6 should be determined according to the total optical length of the zoom optical system 100, so as to ensure the zoom capability of the zoom optical system 100.

[0056] For example, in one embodiment of the present invention, the total optical length of the zoom optical system 100 is TTL, and the displacement of the second lens group 2 is ΔZ1(WT), where 0.218 < ΔZ1(WT) / TTL < 0.283.

[0057] It is understood that the displacement of the second mirror group 2 can be any value within its range. In the embodiments of the present invention, the displacement of the second mirror group 2 can be set to any value within the range. In actual setting, it can be selected according to the requirements.

[0058] In a specific embodiment of the present invention, the displacement of the second mirror group 2 can be set to 87.8 mm, and with this setting, ΔZ1(WT) / TTL=0.251.

[0059] Furthermore, the present invention does not limit the specific value of the displacement of the third lens group 3. In a further embodiment of the present invention, the total optical length of the zoom optical system 100 is TTL, and the displacement of the third lens group 3 is ΔZ2(WT), where 0.15 < ΔZ2(WT) / TTL < 0.194. Similarly, the displacement of the third mirror group 3 can also be arbitrarily selected within its range, and can be selected according to the requirements during actual setting.

[0060] In a specific embodiment of the present invention, the displacement of the third mirror group 3 can be set to 60.2 mm, so that ΔZ2(WT) / TTL=0.172.

[0061] Furthermore, the present invention does not limit the specific value of the displacement of the fourth lens group 4. In a further embodiment of the present invention, the total optical length of the zoom optical system 100 is TTL, and the displacement of the fourth lens group 4 is ΔZ3(WT), where 0.151 < ΔZ3(WT) / TTL < 0.19.

[0062] Of course, the displacement of the fourth mirror group 4 can be any value within its range. In the embodiments of the present invention, the displacement of the fourth mirror group 4 can be set to any value within the range. In actual setting, it can be selected according to the requirements.

[0063] In a specific embodiment of the present invention, the displacement of the fourth mirror group 4 can be set to 60.7 mm, so that ΔZ3(WT) / TTL=0.174.

[0064] Of course, the displacement of the sixth lens group 6 can also be selected according to the requirements. In another embodiment of the present invention, the total optical length of the zoom optical system 100 is TTL, and the displacement of the sixth lens group 6 is ΔZ4(WT), 0.085<ΔF(WT) / TTL<0.11.

[0065] With this configuration, the displacement of the sixth mirror group 6 can be any value within its range. In the embodiments of the present invention, the displacement of the sixth mirror group 6 can be set to any value within the range. In actual settings, it can be selected according to the requirements.

[0066] Specifically, in one embodiment, the displacement of the sixth mirror group 6 can be set to 34.1 mm, and in this embodiment, ΔF(WT) / TTL=0.097.

[0067] It should also be noted that, in this invention, the zoom optical system 100 further includes an aperture stop 8, which is disposed between the third lens group 3 and the fourth lens group 4. The distance between the aperture stop 8 and the image plane 7 is L, and the total optical length of the zoom optical system 100 is TTL, 0.442. <L / TTL<0.574。

[0068] Furthermore, in this invention, the specific value of the distance between the aperture 8 and the image plane 7 can also be set to any value within the range, and this invention does not impose any restrictions on this.

[0069] For example, in one embodiment of the present invention, the distance between the aperture 8 and the image plane 7 can be set to 177.8 mm, so that L / TTL=0.508, which is within the corresponding range.

[0070] To further improve image quality, in a further embodiment of the present invention, the zoom optical system 100 further includes a filter 9, which is disposed between the seventh lens group and the image plane 7. The filter 9 can filter the light entering the image plane 7, filtering out light of specific wavelengths to reduce stray light interference with imaging, thereby further improving the sharpness and color reproduction of the image formed by the zoom optical system 100.

[0071] Furthermore, in the above embodiments, the 23rd lens 66 is configured as an aspherical lens, while all other lenses are configured as spherical lenses.

[0072] In one specific embodiment of the present invention, the diameter of the image plane 7 is 9.2 mm, and the surface type, radius of curvature, thickness, material refractive index, and material Abbe number of the multiple lenses are shown in Table 1 below: Table 1

[0073] It is understood that in this embodiment, the first lens 11 and the second lens 12 are cemented together, the fourth lens 14 and the fifth lens 15 are cemented together, the eighth lens 23 and the ninth lens 24 are cemented together, the twelfth lens 33 and the thirteenth lens 34 are cemented together, the fourteenth lens 41 and the fifteenth lens 42 are cemented together, the sixteenth lens 51 and the seventeenth lens 52 are cemented together, the eighteenth lens 61, the nineteenth lens 62 and the twentieth lens 63 are cemented together, the twenty-first lens 64 and the twenty-second lens 65 are cemented together, and among the multiple lenses, at least the twenty-third lens 66 is set as an aspherical lens.

[0074] Furthermore, in this embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:

[0075] Where c is the curvature corresponding to the radius, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic conic coefficient (when the coefficient k is less than -1, the surface curve is a hyperbola; when the coefficient k is equal to -1, it is a parabola; when the coefficient k is between -1 and 0, it is an ellipse; when the coefficient k is equal to 0, it is a circle; and when the coefficient k is greater than 0, it is an oval), A, B, C, D, E, and F are higher-order aspherical coefficients. The higher-order coefficients of each aspherical mirror are shown in Table 2 below: Table 2 Conic coefficients and aspherical coefficients corresponding to aspherical lenses

[0076] This setup, by rationally allocating the lens power and adjusting the glass shape and material combination, effectively eliminates chromatic aberration and secondary spectrum, allowing spherical aberration, coma, astigmatism, etc. on each lens to compensate and cancel each other out, thereby achieving a clear imaging effect and realizing optimal correction of higher-order aberrations and chromatic aberration.

[0077] It should be further noted that, in this embodiment, the aperture value of the zoom optical system 100 is Fno, 2.8 ≤ Fno ≤ 9.17. When the zoom optical system 100 is at the wide-angle end, the aperture value Fno = 9.18, and when the zoom optical system 100 is at the telephoto end, the aperture value Fnow = 2.8. Thus, the zoom optical system 100 has the characteristic of a large aperture, which enables the zoom optical system 100 to still have excellent imaging effect in low-light environments, meet the imaging requirements of both bright and dark environments, and realize night vision function.

[0078] Please refer to Table 3 for further details. The zoom magnification data of the zoom optical system 100 at the wide-angle end, intermediate magnification, and telephoto end are shown in Table 3. Table 3

[0079] Please see Figure 4 , Figure 4 The diagram shows the MTF of the zoom optical system 100 provided by the present invention: 160 lp / mm. From left to right, the diagram shows the zoom optical system 100 at the wide-angle end, the mid-range focal length, and the telephoto end.

[0080] Please see Figure 5 , Figure 5 This is a schematic diagram of the MTF vs Field of the zoom optical system 100 provided by the present invention. From left to right, the diagram shows the zoom optical system 100 at the wide-angle end, the mid-range focal length, and the telephoto end.

[0081] Please see Figure 6 , Figure 6 This is a schematic diagram of the zoom optical system 100 provided by the present invention at 120 lp / mm (defocus MTF). From left to right, the diagram shows the zoom optical system 100 at the wide-angle end, the mid-range, and the telephoto end.

[0082] Please see Figure 7 , Figure 7 This is an FCD schematic diagram of the zoom optical system 100 provided by the present invention. From left to right, the diagram shows the zoom optical system 100 at the wide-angle end, the mid-range focal length, and the telephoto end.

[0083] Please see Figure 8 , Figure 8 This is a RAY diagram of the zoom optical system 100 provided by the present invention. From left to right, the diagram shows the zoom optical system 100 at the wide-angle end, the mid-range focal length, and the telephoto end.

[0084] Please see Figure 9 , Figure 9 This is a schematic diagram of the zoom optical system 100 provided by the present invention. From left to right, the diagram shows the zoom optical system 100 at the wide-angle end, the mid-range focal length, and the telephoto end.

[0085] Please see Figure 10 , Figure 10 This is a LAT schematic diagram of the zoom optical system 100 provided by the present invention. From left to right, the diagram shows the zoom optical system 100 at the wide-angle end, the mid-range focal length, and the telephoto end.

[0086] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A zoom optical system, characterized in that, The zoom optical system has an object side and an image side arranged correspondingly along the optical axis. It includes a first lens group with positive optical power, a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with negative optical power, a fifth lens group with negative optical power, a sixth lens group with positive optical power, and an image plane arranged sequentially from the object side to the image side. The second lens group, the third lens group, the fourth lens group, and the sixth lens group are all movably arranged in the extension direction of the optical axis. The second lens group, the third lens group, and the fourth lens group are used for zooming, and the sixth lens group is used for focusing. The optical zoom assembly of the zoom optical system is controlled within 350mm. Wherein, the focal length of the zoom optical system at the wide-angle end is fw, and the focal length at the telephoto end is ft. The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the focal length of the fifth lens group is f5, and the focal length of the sixth lens group is f6. The zoom optical system satisfies the following conditions: fw = 16mm, and ft = 840mm, and 0.074 ≤ fw / f1 ≤ 0.100, and -0.511 ≤ fw / f2 ≤ -0.378, and 0.258 ≤ fw / f3 ≤ 0.349, and -0.010 ≤ fw / f4 ≤ -0.007, and -0.480 ≤ fw / f5 ≤ -0.355, and 0.421 ≤ fw / f6 ≤ 0.

570.

2. The zoom optical system as described in claim 1, characterized in that, The first lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side to the image side. The first lens has a negative optical power, the second lens has a positive optical power, the third lens has a positive optical power, the fourth lens has a negative optical power, and the fifth lens has a positive optical power. The first lens and the second lens are cemented together, and the fourth lens and the fifth lens are cemented together. The focal length of the first lens is f11, the focal length of the second lens is f12, the focal length of the third lens is f13, the focal length of the fourth lens is f14, and the focal length of the fifth lens is f15, wherein -0.275≤f1 / f11≤-0.203, and 0.732≤f1 / f12≤0.990, and 0.271≤f1 / f13≤0.367, and -1.212≤f1 / f14≤-0.896, and 0.969≤f1 / f15≤1.

311.

3. The zoom optical system as described in claim 2, characterized in that, The aperture of the second lens is øL12, and the total optical length of the zoom optical system is TTL, where 0.234 < øL12 / TTL < 0.

498.

4. The zoom optical system as described in claim 1, characterized in that, The second lens group includes a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially from the object side to the image side. The optical power of the sixth lens is negative, the optical power of the seventh lens is negative, the optical power of the eighth lens is negative, and the optical power of the ninth lens is positive. The eighth lens and the ninth lens are cemented together. The focal length of the sixth lens is f21, the focal length of the seventh lens is f22, the focal length of the eighth lens is f23, and the focal length of the ninth lens is f24, wherein 0.209≤f2 / f21≤0.283, 0.577≤f2 / f22≤0.780, 0.541≤f2 / f23≤0.732, and -0.675≤f2 / f24≤-0.

499.

5. The zoom optical system as described in claim 1, characterized in that, The third lens group includes a tenth lens, an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially from the object side to the image side. The eleventh lens has a positive optical power, the twelfth lens has a positive optical power, the thirteenth lens has a negative optical power, and the fourteenth lens has a positive optical power. The twelfth lens and the thirteenth lens are cemented together. The focal length of the tenth lens is f31, the focal length of the eleventh lens is f32, the focal length of the twelfth lens is f33, and the focal length of the thirteenth lens is f34, wherein 0.323≤f3 / f31≤0.437, and 0.468≤f3 / f32≤0.633, and -0.762≤f3 / f33≤-0.563, and 0.620≤f3 / f34≤0.

838.

6. The zoom optical system as described in claim 1, characterized in that, The fourth lens group includes a fourteenth lens and a fifteenth lens arranged sequentially from the object side to the image side. The fourteenth lens has a positive optical power, and the fifteenth lens has a negative optical power. The fourteenth lens and the fifteenth lens are cemented together. The focal length of the fourteenth lens is f41, and the optical power of the fifteenth lens is f42, wherein -6.777≤f4 / f41≤-5.009, and 5.659≤f4 / f42≤7.

656.

7. The zoom optical system as described in claim 1, characterized in that, The fifth lens group includes a sixteenth lens and a seventeenth lens arranged sequentially from the object side to the image side. The sixteenth lens has a negative optical power, and the seventeenth lens has a positive optical power. The sixteenth lens and the seventeenth lens are cemented together. The focal length of the sixteenth lens is f51, and the focal length of the seventeenth lens is f52, wherein 1.742≤f5 / f51≤2.356, and -1.285≤f5 / f52≤-0.

950.

8. The zoom optical system as described in claim 1, characterized in that, The sixth lens group includes an eighteenth lens, a nineteenth lens, a twentieth lens, a twenty-first lens, a twenty-second lens, and a twenty-third lens arranged sequentially from the object side to the image side. The eighteenth lens has a positive optical power, the nineteenth lens has a negative optical power, the twentieth lens has a negative optical power, the twenty-first lens has a positive optical power, the twenty-third lens has a negative optical power, and the eighteenth, nineteenth, and twentieth lenses are cemented together to form a three-layer cemented joint. The twenty-first and twenty-second lenses are also cemented together. The focal length of the eighteenth lens is f61, the focal length of the nineteenth lens is f62, the focal length of the twentieth lens is f63, the focal length of the twenty-first lens is f64, the focal length of the twenty-second lens is f65, and the focal length of the twenty-third lens is f66, wherein 0.525≤f6 / f61≤0.710, and -1.612≤f6 / f62≤-1.191, and -0.439≤f6 / f63≤-0.324, and 1.535≤f6 / f64≤2.077, and -1.841≤f6 / f65≤-1.360, and 1.169≤f6 / f66≤1.

582.

9. The zoom optical system as described in claim 1, characterized in that, The total optical length of the zoom optical system is TTL, and the displacement of the second lens group is ΔZ1(WT), where 0.218 < ΔZ1(WT) / TTL < 0.283; and / or, The total optical length of the zoom optical system is TTL, and the displacement of the third lens group is ΔZ2(WT), where 0.15 < ΔZ2(WT) / TTL < 0.194; and / or, The total optical length of the zoom optical system is TTL, and the displacement of the fourth lens group is ΔZ3(WT), where 0.151 < ΔZ3(WT) / TTL < 0.19; and / or, The total optical length of the zoom optical system is TTL, and the displacement of the sixth lens group is ΔZ4(WT), where 0.085 < ΔF(WT) / TTL < 0.

11.

10. The zoom optical system as claimed in claim 1, characterized in that, The zoom optical system also includes an aperture stop, which is located between the third lens group and the fourth lens group. The distance between the aperture stop and the image plane is L. The total optical length of the zoom optical system is TTL, 0.

442. <L / TTL<0.574。

Images