Zoom optical system and optical lens

Abstract

The invention discloses a zoom optical system and an optical lens, and relates to the technical field of zoom optics, the zoom optical system is provided with an object side and an image side which are oppositely arranged along the direction of an optical axis, and the zoom optical system comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an image surface which are sequentially arranged from the object side to the image side, the focal power of the first lens group is positive, the focal power of the second lens group is negative, the focal power of the third lens group is positive, the focal power of the fourth lens group is positive, the second lens group and the fourth lens group are movably arranged along the optical axis direction, the second lens group is used for zooming, and the fourth lens group is used for focusing. By means of the arrangement, the zoom optical system can have a larger zoom ratio so as to ensure clear imaging of the zoom optical system, and finally the effects of large zoom, high image quality and low cost of the zoom optical system are achieved.

Description

Technical Field

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

[0002] Currently, mainstream high-resolution surveillance system zoom lenses on the market suffer from drawbacks such as large size and high cost, failing to meet market demands. Summary of the Invention

[0003] The main objective of this invention is to propose a zoom optical system and optical lens, which aims to improve the shortcomings of existing zoom lenses, such as large size and high cost, and their inability to meet market demands.

[0004] To achieve the above objectives, the zoom optical system proposed in this invention has an object side and an image side arranged opposite to each other along the optical axis. The zoom optical system includes a first lens group, a second lens group, a third lens group, a fourth lens group, and an image plane arranged sequentially from the object side to the image side. The first lens group has positive optical power, the second lens group has negative optical power, the third lens group has positive optical power, and the fourth lens group has positive optical power. Both the second and fourth lens groups are movable along the optical axis. The second lens group is used for zooming, and the fourth lens group is used for focusing. The zoom optical system satisfies the following conditions:

[0005] 0.1≤fw / f1≤0.6, and -1≤fw / f2≤-0.2, and 0.1≤fw / f3≤0.5, and 0.1≤fw / f4≤0.4; Wherein, the focal length of the zoom optical system at the wide-angle end is fw, 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, and the focal length of the fourth lens group is f4.

[0006] In one embodiment, the first lens group includes a first lens, a second lens, a third lens, and a fourth 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, and the fourth lens has a positive optical power. The first lens and the second 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, and the focal length of the fourth lens is f14. Wherein, -0.6≤f1 / f11≤-0.1, and 0.52≤f1 / f12≤0.71, and 0.46≤f1 / f13≤0.62, and 0.31≤f1 / f14≤0.41.

[0007] In one embodiment, the distance between the center of the object side surface of the first lens and the image surface is TTL, where TTL ≤ 81.5 mm.

[0008] In one embodiment, the second lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side. The optical power of the fifth lens is negative, the optical power of the sixth lens is negative, and the optical power of the seventh lens is positive. The focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23, wherein 0.70≤f2 / f21≤0.95, and 0.52≤f2 / f22≤0.70, and -0.49≤f2 / f23≤-0.36.

[0009] In one embodiment, the third lens group includes an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side. The optical power of the eighth lens is positive, the optical power of the ninth lens is positive, and the optical power of the tenth lens is negative. The focal length of the eighth lens is f31, the focal length of the ninth lens is f32, and the focal length of the tenth lens is f33. 1.25 ≤ f3 / f31 ≤ 1.69, and 0.05 ≤ f3 / f32 ≤ 0.06, and -0.8 ≤ f3 / f33 ≤ -0.59.

[0010] In one embodiment, the fourth lens group includes 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 negative optical power, and the thirteenth lens has a positive optical power. The focal length of the eleventh lens is f41, the focal length of the twelfth lens is f42, and the focal length of the thirteenth lens is f43. 1.12 ≤ f4 / f41 ≤ 1.52, and -1.07 ≤ f4 / f42 ≤ -0.79, and 0.5 ≤ f4 / f43 ≤ 0.68.

[0011] In one embodiment, the diameter of the image plane is IC, where IC ≤ 7 mm.

[0012] In one embodiment, the first lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially from the object side to the image side; the second lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side; the third lens group includes an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side; and the fourth lens group includes an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially from the object side to the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the tenth lens, and the eleventh lens are glass spherical lenses, and the sixth lens, the seventh lens, the ninth lens, the twelfth lens, and the thirteenth lens are plastic aspherical lenses.

[0013] In one embodiment, the zoom optical system further includes an aperture stop disposed between the second lens group and the third lens group, the aperture stop being used to adjust the amount of light transmitted by the zoom optical system.

[0014] The present invention also proposes an optical lens, the optical lens including a zoom optical system, the zoom optical system including the zoom optical system as described in any one of claims 1 to 9.

[0015] In the technical solution of this invention, the first lens group and the third lens group are set as fixed lens groups, while the second lens group and the fourth lens group are movable along the optical axis to zoom and focus the zoom optical system. This allows the zoom optical system to maintain a clear image of the image plane during zooming. Thus, by conditionally limiting the ratio of the focal length of the four lens groups to the focal length of the zoom optical system at the wide-angle end, the zoom optical system can have a larger zoom ratio, ensuring a clear image and ultimately achieving the effects of large zoom, high image quality, and low cost. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of an embodiment of the zoom optical system provided by the present invention; Figure 2 for Figure 1 A schematic diagram of LAT (vertical chromatic aberration) at the wide-angle end of a medium zoom optical system; Figure 3 for Figure 1 A schematic diagram of LAT (vertical chromatic aberration) at the telephoto end of a medium zoom optical system.

[0018] Explanation of icon numbers: 100. Zoom optical system; 1. First lens group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 2. Second lens group; 21. Fifth lens; 22. Sixth lens; 23. Seventh lens; 3. Third lens group; 31. Eighth lens; 32. Ninth lens; 33. Tenth lens; 4. Fourth lens group; 41. Eleventh lens; 42. Twelfth lens; 43. Thirteenth lens; 5. Image plane; 6. Aperture stop; 7. Filter.

[0019] 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

[0020] 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.

[0021] 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.

[0022] 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.

[0023] This invention proposes a zoom optical system designed to address the shortcomings of existing zoom lenses, such as large size and high cost, which fail to meet market demands.

[0024] Please see Figure 1In one embodiment of the present invention, the zoom optical system 100 has an object side and an image side arranged opposite to each other along the optical axis. The zoom optical system 100 includes a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4, and an image plane 5 arranged sequentially from the object side to the image side. The optical power of the first lens group 1 is positive, the optical power of the second lens group 2 is negative, the optical power of the third lens group 3 is positive, and the optical power of the fourth lens group 4 is positive. The second lens group 2 and the fourth lens group 4 are both movable along the optical axis. The second lens group 2 is used for zooming, and the fourth lens group 4 is used for focusing. The zoom optical system 100 satisfies the following conditions: 0.1≤fw / f1≤0.6, and -1≤fw / f2≤-0.2, and 0.1≤fw / f3≤0.5, and 0.1≤fw / f4≤0.4. The focal length of the zoom optical system 100 at the wide-angle end is fw, 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, and the focal length of the fourth lens group 4 is f4.

[0025] In the technical solution of the present invention, the first lens group 1 and the third lens group 3 are set as fixed lens groups, and the second lens group 2 and the fourth lens group 4 are movably set along the optical axis to zoom and focus the zoom optical system 100, thereby ensuring that the zoom optical system 100 maintains clear imaging of the image plane 5 during zooming. Thus, by conditionally limiting the ratio of the focal length of the four lens groups to the focal length of the zoom optical system 100 at the wide-angle end, the zoom optical system 100 can have a larger zoom ratio to ensure clear imaging, ultimately achieving the effect of large zoom, high image quality, and low cost of the zoom optical system 100.

[0026] Of course, it is understood that in this invention, when the second lens group 2 and the fourth lens group 4 move along the optical axis extension direction, this invention does not limit whether there is a time difference between the movements of the second lens group 2 and the fourth lens group 4. For example, in one embodiment of this invention, the second lens group 2 and the fourth lens group 4 can be set to move separately. With this setting, when the zoom optical system 100 needs to be zoomed, the second lens group 2 moves to realize the zoom function of the zoom optical system 100. After the zoom is completed, the fourth lens group 4 moves to realize the focusing function of the zoom optical system 100. In another embodiment of the present invention, the second lens group 2 and the fourth lens group 4 are simultaneously movable along the optical axis. This arrangement allows the fourth lens group 4 to perform real-time focusing on the zoom optical system 100 when the second lens group 2 moves along the optical axis to zoom the system. This ensures that the image plane 5 remains clear during zooming, avoiding blurring and defocusing caused by the movement of the second and fourth lens groups along the optical axis. This not only improves the operational flexibility of the zoom optical system 100 but also significantly enhances its imaging stability and reliability.

[0027] It is also understood that, in this invention, when the second mirror group 2 and the fourth mirror group 4 move along the optical axis, this invention does not limit the specific movement mode of the second mirror group 2 and the fourth mirror group 4. In one embodiment of this invention, the second mirror group 2 and the fourth mirror group 4 can be configured to be driven by separate drive motors, that is, a single drive motor is used to drive one mirror group to move along the optical axis. With this configuration, independent movement of the second mirror group 2 and the fourth mirror group 4 along the optical axis can be achieved. In another embodiment of this invention, the second mirror group 2 and the fourth mirror group 4 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 and the fourth mirror group 4 respectively, thereby realizing the coordinated movement of the second mirror group 2 and the fourth mirror group 4.

[0028] In another embodiment of the present invention, the second mirror group 2 and the fourth mirror group 4 can also be configured to be manually driven to move along the optical axis. The present invention does not impose any restrictions on this, and the selection can be made according to the requirements in actual settings.

[0029] It should be noted that the present invention does not limit the specific ratio of the focal length of the first lens group 1, the second lens group 2, the third lens group 3 and the fourth lens group 4 to the focal length of the zoom optical system 100 at the wide-angle end. 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 39.00 mm, the focal length of the second lens group 2 can be set to -7.20 mm, the focal length of the third lens group 3 can be set to 25.58 mm, the focal length of the fourth lens group 4 can be set to 20.18 mm, and the focal length of the zoom optical system 100 at the wide-angle end can be set to 5.40 mm. With this configuration, 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 = 0.14; 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 = -0.75; 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 3 is fw / f3 = 0.21; and the ratio of the focal length of the zoom optical system 100 at the wide-angle end to the focal length of the fourth lens group 4 is fw / f4 = 0.27. Thus, the ratios of the focal length of the zoom optical system 100 at the wide-angle end to the focal lengths of the first lens group 1, the second lens group 2, the third lens group 3, and the fourth lens group 4 are all within their respective ranges, thereby ensuring that the zoom optical system 100 maintains good image quality during zooming.

[0031] Specifically, to ensure successful imaging of the zoom optical system 100 and to guarantee the image sharpness of the zoom optical system 100, in one embodiment of the present invention, the first lens group 1 includes a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 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, and the optical power of the fourth lens 14 is positive. The first lens 11 and the second lens 12 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, and the focal length of the fourth lens 14 is f14. Wherein, -0.6≤f1 / f11≤-0.1, and 0.52≤f1 / f12≤0.71, and 0.46≤f1 / f13≤0.62, and 0.31≤f1 / f14≤0.41.

[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, and the fourth lens 14. In this embodiment, the specific values ​​of the focal lengths of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 can also be set to any value within the range, and the present invention does not impose any restrictions on this.

[0033] For example, in one embodiment of the present invention, the focal length of the first lens group 1 is set to 39.00 mm. In this case, the focal length of the first lens 11 can be set to -82.06 mm, the focal length of the second lens 12 can be set to 63.26 mm, the focal length of the third lens 13 can be set to 72.20 mm, and the focal length of the fourth lens 14 can be set to 108.58 mm. With this configuration, in this embodiment, the focal length ratio of the first lens group 1 to the first lens 11 is f1 / f11 = -0.48, and the focal length ratio of the first lens group 1 to the second lens 14 is... The focal length ratio of lens 12 is f1 / f12=0.62, the focal length ratio of the first lens 1 to the third lens 13 is f1 / f13=0.54, and the focal length ratio of the first lens group 1 to the fourth lens 14 is f1 / f14=0.36. Thus, the focal length ratios of the first lens group 1 with the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 are all within the corresponding ratio range, which can ensure the 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. This arrangement can 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 optimizing the processing flow to meet design requirements. Therefore, the reasonable use of cemented components can improve the image quality of the optical system.

[0036] Furthermore, to ensure the miniaturization of the zoom optical system 100, in one embodiment of the present invention, the distance between the center of the object-side surface of the first lens 11 and the image plane 5 is TTL, where TTL ≤ 81.5 mm. This setting effectively controls the overall length of the zoom optical system 100, making it more compact and meeting the requirements of miniaturization design.

[0037] Similarly, in order to achieve smooth 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 fifth lens 21, a sixth lens 22, and a seventh lens 23 arranged sequentially from the object side to the image side. The optical power of the fifth lens 21 is negative, the optical power of the sixth lens 22 is negative, and the optical power of the seventh lens 23 is positive. The focal length of the fifth lens 21 is f21, the focal length of the sixth lens 22 is f22, and the focal length of the seventh lens 23 is f23, wherein 0.70≤f2 / f21≤0.95, and 0.52≤f2 / f22≤0.70, and -0.49≤f2 / f23≤-0.36.

[0038] Of course, the present invention does not limit the specific values ​​of the focal lengths of the fifth lens 21, the sixth lens 22 and the seventh lens 23. In the embodiments of the present invention, the specific values ​​of the focal lengths of the fifth lens 21, the sixth lens 22 and the seventh lens 23 can also be set to any value within the 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 is set to -7.20mm. In this case, the focal length of the fifth lens 21 can be set to -8.75mm, the focal length of the sixth lens 22 can be set to -11.82mm, and the focal length of the seventh lens 23 can be set to 17.00mm. With this setting, in this embodiment, the ratio of the focal length of the second lens group 2 to the focal length of the fifth lens 21 is f2 / f21=0.82, the ratio of the focal length of the second lens group 2 to the focal length of the sixth lens 22 is f2 / f22=0.61, and the ratio of the focal length of the second lens group 2 to the focal length of the seventh lens 23 is f2 / f23=-0.42. Thus, the ratios of the focal lengths of the second lens group 2 to the focal lengths of the fifth lens 21, the sixth lens 22, and the seventh lens 23 are all within the corresponding ratio ranges, which can ensure that the optical power of the second lens group 2 is reasonably distributed in the zoom optical system 100, thereby improving the imaging performance of the zoom optical system 100.

[0040] Furthermore, the present invention does not limit the specific number and form of lenses within the third lens group 33. In a further embodiment of the present invention, the third lens group 3 includes an eighth lens 31, a ninth lens 32, and a tenth lens 33 arranged sequentially from the object side to the image side. The optical power of the eighth lens 31 is positive, the optical power of the ninth lens 32 is positive, and the optical power of the tenth lens 33 is negative. The focal length of the eighth lens 31 is f31, the focal length of the ninth lens 32 is f32, and the focal length of the tenth lens 33 is f33. 1.25 ≤ f3 / f31 ≤ 1.69, and 0.05 ≤ f3 / f32 ≤ 0.06, and -0.8 ≤ f3 / f33 ≤ -0.59. It can be understood that in this embodiment, the specific focal length values ​​of the eighth lens 31, the ninth lens 32, and the tenth lens 33 can also be selected according to actual conditions.

[0041] For example, in one embodiment of the present invention, the focal length of the third lens group 3 can be set to 25.58 mm, the focal length of the eighth lens 31 can be set to 17.42 mm, the focal length of the ninth lens 32 can be set to 474.70 mm, and the focal length of the tenth lens 33 can be set to -36.76 mm. In this embodiment, the ratio of the focal length of the third lens group 3 to the eighth lens 31 is f3 / f31 = 1.47, the ratio of the focal length of the third lens group 3 to the ninth lens 32 is f3 / f32 = 0.05, and the ratio of the focal length of the third lens group 3 to the tenth lens 33 is f3 / f33 = -0.70. Thus, the focal length ratios of the third lens group 3 with the eighth lens 31, the ninth lens 32, and the tenth lens 33 are all within the corresponding ratio range, which can ensure that the optical power of the third lens group 3 is reasonably distributed in the zoom optical system 100, thereby improving the imaging performance of the zoom optical system 100.

[0042] Furthermore, the present invention does not limit the specific number and form of lenses in the fourth lens group 4. In a further embodiment of the present invention, the fourth lens group 4 includes an eleventh lens 41, a twelfth lens 42, and a thirteenth lens 43 arranged sequentially from the object side to the image side. The optical power of the eleventh lens 41 is positive, the optical power of the twelfth lens 42 is negative, and the optical power of the thirteenth lens 43 is positive. The focal length of the eleventh lens 41 is f41, the focal length of the twelfth lens 42 is f42, and the focal length of the thirteenth lens 43 is f43. 1.12≤f4 / f41≤1.52, and -1.07≤f4 / f42≤-0.79, and 0.5≤f4 / f43≤0.68. Similarly, it is understood that the present invention does not limit the specific ratio of the focal lengths of the fourth lens group 4, the eleventh lens 41, the twelfth lens 42, and the thirteenth lens 43. In the present invention, the specific values ​​of the focal lengths of the eleventh lens 41, the twelfth lens 42, and the thirteenth lens 43 can also be selected according to actual conditions.

[0043] In one embodiment of the present invention, the focal length of the fourth lens group 4 can be set to 20.18 mm, the focal length of the eleventh lens 41 can be set to 15.30 mm, the focal length of the twelfth lens 42 can be set to -21.70 mm, and the focal length of the thirteenth lens 43 can be set to 34.04 mm. In this case, the ratio of the focal length of the fourth lens group 4 to the eleventh lens 41 is f4 / f41 = 1.32, the ratio of the focal length of the fourth lens group 4 to the twelfth lens 42 is f4 / f41 = -0.93, and the ratio of the focal length of the fourth lens group 4 to the thirteenth lens 43 is f4 / f41 = 0.59. Thus, these ratio values ​​are also within the corresponding ratio range, which can ensure that the zoom optical system 100 can maintain good image quality during zooming.

[0044] Of course, in order to maintain the miniaturization of the zoom optical system 100 while ensuring its imaging performance, in one embodiment of the present invention, the diameter of the image plane 5 is IC, where IC ≤ 7 mm. This setting effectively controls the size of the image plane 5 of the zoom optical system 100, making the entire optical system more compact and adaptable to more applications with strict space requirements while meeting imaging needs.

[0045] Furthermore, through careful design of the lenses in each lens group and reasonable setting of the focal length ratio, the zoom optical system 100 can effectively correct aberrations at different zoom positions. Aberration correction includes, but is not limited to, spherical aberration, coma, astigmatism, field curvature, and distortion, thereby ensuring that high-quality, clear images without significant distortion can be obtained throughout the entire zoom range.

[0046] Furthermore, in the above embodiments, the present invention does not limit the specific materials of each lens. In a further embodiment of the present invention, the first lens group 1 includes a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 arranged sequentially from the object side to the image side; the second lens group 2 includes a fifth lens 21, a sixth lens 22, and a seventh lens 23 arranged sequentially from the object side to the image side; the third lens group 3 includes an eighth lens 31, a ninth lens 32, and a tenth lens 33 arranged sequentially from the object side to the image side; and the fourth lens group 4 includes an eleventh lens 41, a twelfth lens 42, and a thirteenth lens 43 arranged sequentially from the object side to the image side. The first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 21, the eighth lens 31, the tenth lens 33, and the eleventh lens 41 are glass spherical lenses, and the sixth lens 22, the seventh lens 23, the ninth lens 32, the twelfth lens 42, and the thirteenth lens 43 are plastic aspherical lenses.

[0047] In this embodiment, by setting the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 21, the eighth lens 31, the tenth lens 33, and the eleventh lens 41 as glass spherical lenses, the glass material has high thermal stability and a low coefficient of thermal expansion, enabling the glass lenses to have good resistance to thermal deformation. This reduces the impact of temperature on the zoom optical system 100. When the temperature changes, the shape and size of the glass lenses change very little, effectively resisting the problem of thermal deformation of the zoom optical system 100. This allows the zoom optical system 100 to maintain stable optical performance under different temperature environments, reducing aberrations caused by temperature changes and ensuring consistent image quality. At the same time, using spherical lenses can reduce costs while ensuring image quality and reliability, with lower assembly sensitivity and improved product yield.

[0048] By setting the sixth lens 22, the seventh lens 23, the ninth lens 32, the twelfth lens 42, and the thirteenth lens 43 as plastic aspherical lenses, the plastic material, with its inherent flexibility, is less prone to damage than glass lenses when subjected to minor external impacts, thus improving the durability of the zoom optical system 100. Furthermore, aspherical lenses are characterized by a continuously changing curvature from the lens center to the periphery, unlike spherical lenses which have a constant curvature. Aspherical lenses offer superior curvature radius characteristics, improving distortion and astigmatism. Using aspherical lenses can minimize aberrations that occur during image formation, thereby enhancing the lens's image quality.

[0049] Furthermore, in this invention, to adjust the light transmission of the zoom optical system 100, in one embodiment, the zoom optical system 100 further includes an aperture stop 6, which is disposed between the second lens group 2 and the third lens group 3. The aperture stop 6 is used to adjust the light transmission of the zoom optical system 100. With this configuration, by placing the aperture stop 6 between the second lens group 2 and the third lens group 3, the amount of light entering the zoom optical system 100 can be flexibly adjusted according to actual needs. In strong light, reducing the aperture stop 6 can decrease the light entering the system, avoiding overexposure and ensuring image clarity and detail; while in weak light, increasing the aperture stop 6 can increase the light entering the system, making the image brighter, thus adapting to shooting needs under different lighting conditions.

[0050] Of course, in this invention, the zoom optical system 100 is also provided with a filter 7, which is disposed between the fourth lens group 4 and the image plane 5. The filter 7 is used to prevent stray light from interfering with the imaging quality, thereby further improving the imaging quality.

[0051] In a specific embodiment of the present invention, the parameters of the material, surface type, radius of curvature, thickness, refractive index, Abbe number, and focal length of the plurality of lenses are shown in Table 1 below: Table 1

[0052] It is understood that in this embodiment, the sixth lens 22, the seventh lens 23, the ninth lens 32, the twelfth lens 42, and the thirteenth lens 43 are all configured as aspherical lenses.

[0053] Furthermore, in this embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:

[0054] 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 quadratic coefficient (when the k coefficient is less than -1, the surface curve is a hyperbola; when the k coefficient is equal to -1, it is a parabola; when the k coefficient is between -1 and 0, it is an ellipse; when the k coefficient is equal to 0, it is a circle; and when the k coefficient is greater than 0, it is an oval), A, B, C, D, E, F, G, and H are higher-order aspherical coefficients (please refer to Table 2 below). The shape and size of the aspherical surfaces of the object side and image side of the lens can be set by using the above parameters.

[0055] Table 2 Conic coefficients and aspherical coefficients corresponding to aspherical lenses

[0056] 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.

[0057] Please see Figure 2 , Figure 2 This is a schematic diagram of the LAT (vertical chromatic aberration) at the wide-angle end of the zoom optical system 100 in this embodiment.

[0058] Please see Figure 3 , Figure 3 This is a schematic diagram of the vertical chromatic aberration (LAT) at the telephoto end of the zoom optical system 100 in this embodiment.

[0059] Furthermore, the focal length and aperture changes of the zoom optical system 100 from the Wide end (wide-angle end) to the Tele end (telephoto end) in this embodiment, as well as the zoom magnification data between each lens group, are shown in Table 3: Table 3

[0060] The present invention also proposes an optical lens, which includes a zoom optical system 100. The specific structure of the zoom optical system 100 is as described in the above embodiments. Since the optical lens adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0061] 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 opposite each other along the optical axis. The zoom optical system includes a first lens group, a second lens group, a third lens group, a fourth lens group, and an image plane arranged sequentially from the object side to the image side. The first lens group has positive optical power, the second lens group has negative optical power, the third lens group has positive optical power, and the fourth lens group has positive optical power. Both the second and fourth lens groups are movable along the optical axis. The second lens group is used for zooming, and the fourth lens group is used for focusing. The zoom optical system satisfies the following conditions: 0.1≤fw / f1≤0.6, and -1≤fw / f2≤-0.2, and 0.1≤fw / f3≤0.5, and 0.1≤fw / f4≤0.4; Wherein, the focal length of the zoom optical system at the wide-angle end is fw, 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, and the focal length of the fourth lens group is f4.

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, and a fourth 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, and the fourth lens has a positive optical power. The first lens and the second 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, and the focal length of the fourth lens is f14. Wherein, -0.6≤f1 / f11≤-0.1, and 0.52≤f1 / f12≤0.71, and 0.46≤f1 / f13≤0.62, and 0.31≤f1 / f14≤0.

41.

3. The zoom optical system as described in claim 2, characterized in that, The distance between the center of the object side surface of the first lens and the image surface is TTL, where TTL ≤ 81.5 mm.

4. The zoom optical system as described in claim 1, characterized in that, The second lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side. The optical power of the fifth lens is negative, the optical power of the sixth lens is negative, and the optical power of the seventh lens is positive. The focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23. Wherein, 0.70≤f2 / f21≤0.95, and 0.52≤f2 / f22≤0.70, and -0.49≤f2 / f23≤-0.

36.

5. The zoom optical system as described in claim 1, characterized in that, The third lens group includes an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side. The optical power of the eighth lens is positive, the optical power of the ninth lens is positive, and the optical power of the tenth lens is negative. The focal length of the eighth lens is f31, the focal length of the ninth lens is f32, and the focal length of the tenth lens is f33. 1.25≤f3 / f31≤1.69, and 0.05≤f3 / f32≤0.06, and -0.8≤f3 / f33≤-0.

59.

6. The zoom optical system as described in claim 1, characterized in that, The fourth lens group includes 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 negative optical power, and the thirteenth lens has a positive optical power. The focal length of the eleventh lens is f41, the focal length of the twelfth lens is f42, and the focal length of the thirteenth lens is f43. 1.12≤f4 / f41≤1.52, and -1.07≤f4 / f42≤-0.79, and 0.5≤f4 / f43≤0.

68.

7. The zoom optical system as described in claim 1, characterized in that, The diameter of the image plane is IC, where IC ≤ 7 mm.

8. 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, and a fourth lens arranged sequentially from the object side to the image side. The second lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially from the object side to the image side. The third lens group includes an eighth lens, a ninth lens, and a tenth lens arranged sequentially from the object side to the image side. The fourth lens group includes an eleventh lens, a twelfth lens, and a thirteenth lens arranged sequentially from the object side to the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the tenth lens, and the eleventh lens are glass spherical lenses, and the sixth lens, the seventh lens, the ninth lens, the twelfth lens, and the thirteenth lens are plastic aspherical lenses.

9. The zoom optical system as described in claim 1, characterized in that, The zoom optical system also includes an aperture stop, which is located between the second lens group and the third lens group, and is used to adjust the amount of light transmitted by the zoom optical system.

10. An optical lens, characterized in that, The optical lens includes a zoom optical system, which includes the zoom optical system as described in any one of claims 1 to 9.

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