Zoom optical system

Abstract

The utility model discloses a zoom optical system, which relates to the technical field of zoom optical systems, is provided with an object side and an image side which are correspondingly arranged along the direction of an optical axis, and comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group which are sequentially arranged from the object side to the image side, the second lens group and the fourth lens group are movably arranged in the direction of the optical axis, the second lens group is used for zooming, the fourth lens group is used for focusing, and the total optical length of the zooming optical system is controlled within 53 mm. Therefore, the second lens group is movably arranged along the direction of the optical axis to zoom the zoom optical system, and the fourth lens group moves cooperatively to focus, so that the zoom optical system keeps clear imaging of an image plane in the zoom process, and the ratio of the focal lengths of the five lens groups to the focal length of the zoom optical system at the wide-angle end is conditionally limited, so that the zoom optical system is more accurate in zoom. While the imaging quality is ensured, the space requirement of the lens is met, so that the zoom optical system with high imaging quality and small size is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of zoom optical systems, in particular to a zoom optical system. Background Art

[0002] Zoom optical systems are becoming increasingly popular in the security monitoring market because of their variable focal length, which makes them suitable for a variety of monitoring scenarios.

[0003] However, the mainstream high-quality surveillance system zoom optical system currently on the market cannot take into account the characteristics of small size and large image surface, and cannot meet the space requirements of the lens while ensuring imaging quality. Utility Model Content

[0004] The main purpose of the utility model is to propose a zoom optical system, aiming to solve the problem that the existing zoom optical system of the high-image quality monitoring system cannot take into account the characteristics of small volume and large image surface, and cannot meet the space requirements of the lens while ensuring the imaging quality.

[0005] To achieve the above-mentioned object, the zoom optical system proposed in the utility model has an object side and an image side correspondingly arranged along the optical axis direction, the zoom optical system comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group arranged in sequence from the object side to the image side, the second lens group and the fourth lens group are both movably arranged along the optical axis direction, the second lens group is used for zooming, the fourth lens group is used for focusing, and the total optical length of the zoom optical system is controlled within 53 mm;

[0006] 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, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5. The zoom optical system meets the following conditions:

[0007] 0.15≤fw / f1≤0.52; and -0.912≤fw / f2≤-0.642; and 0.2323≤fw / f3≤1.2; and 0.2458≤fw / f4≤1.2; and -0.052≤fw / f5≤-0.3.

[0008] In one embodiment, the optical power of the first lens group is positive;

[0009] The optical power of the second lens group is negative;

[0010] The optical power of the third lens group is positive;

[0011] The optical power of the fourth lens group is positive;

[0012] The optical power of the fifth lens group is negative.

[0013] In one embodiment, the first lens group includes a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power, which are sequentially arranged along the optical axis, and the first lens and the second lens are cemented together;

[0014] The focal length of the first lens is f11, the focal length of the second lens is f12, and the focal length of the third lens is f13, wherein -0.35≤f1 / f11≤-0.26; and 0.52≤f1 / f12≤0.71; and 0.60≤f1 / f13≤0.81.

[0015] In one embodiment, the second lens group includes a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power, which are sequentially arranged along the optical axis, and the sixth lens and the seventh lens are cemented together;

[0016] The focal length of the fourth lens is f21, the focal length of the fifth lens is f22, the focal length of the sixth lens is f23, and the focal length of the seventh lens is f24, wherein 0.64≤f2 / f21≤0.87; and -0.19≤f2 / f22≤-0.14; and 0.64≤f2 / f23≤0.87; and -0.52≤f2 / f23≤-0.39.

[0017] In one embodiment, the third lens group includes an eighth lens with positive optical power, a ninth lens with positive optical power, a tenth lens with negative optical power, and an eleventh lens with negative optical power, which are sequentially arranged along the optical axis direction, and the ninth lens and the tenth lens are cemented together;

[0018] The focal length of the eighth lens is f31, the focal length of the ninth lens is f32, the focal length of the tenth lens is f33, and the focal length of the eleventh lens is f34, wherein 0.99≤f3 / f31≤1.34; and 0.69≤f3 / f32≤0.93; and -0.62≤f3 / f33≤-0.46; and -6.74≤f3 / f34≤-4.98.

[0019] In one embodiment, the fourth lens group includes a twelfth lens having positive optical power;

[0020] The focal length of the twelfth lens is f41, wherein 0.2458≤fw / f41≤1.2.

[0021] In one embodiment, the fifth lens group includes a thirteenth lens with positive optical power and a fourteenth lens with negative optical power which are arranged in sequence along the optical axis;

[0022] The focal length of the thirteenth lens is f51, and the focal length of the fourteenth lens is f52, wherein -1.13≤f5 / f51≤-0.83; and 1.74≤f5 / f52≤2.35.

[0023] In one embodiment, the target surface size of the zoom optical system is φ, φ≤13.1 mm.

[0024] In one embodiment, the aperture of the zoom optical system is Fno, 1.70≤Fno≤1.81; and / or,

[0025] The focal length of the zoom optical system is f, 10mm≤f≤30mm.

[0026] In one embodiment, the zoom optical system further includes an aperture and a filter, wherein the aperture is disposed between the second lens group and the third lens group, and the filter is disposed on a side of the fifth lens group facing the image side.

[0027] In the technical solution of the utility model, the first lens group, the third lens group and the fifth lens group are all fixed lens groups, the second lens group is movably arranged along the optical axis direction to zoom the zoom optical system, and the fourth lens group moves cooperatively along the optical axis direction to focus the zoom optical system, so that the zoom optical system can keep the image of the image plane clear during the zooming process. In this way, the total optical length of the zoom optical system is controlled within 53mm through the conditional restriction of the ratio of the focal length of the five lens groups to the focal length of the zoom optical system at the wide-angle end, so as to meet the space requirements of the lens while ensuring the imaging quality, so as to provide a zoom optical system with high imaging quality and small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 A schematic structural diagram of an embodiment of a zoom optical system provided by the utility model;

[0030] Figure 2 is a schematic diagram of FCD when the zoom optical system is at a wide-angle end;

[0031] Figure 3 is a schematic diagram of FCD when the zoom optical system is at the telephoto end;

[0032] Figure 4 is a schematic diagram of LON when the zoom optical system is at a wide-angle end;

[0033] Figure 5 FIG. 4 is a schematic diagram of LON when the zoom optical system is at the telephoto end.

[0034] Description of Figure Numbers:

[0035] 100. Zoom optical system; 1. First lens group; 11. First lens; 12. Second lens; 13. Third lens; 2. Second lens group; 21. Fourth lens; 22. Fifth lens; 23. Sixth lens; 24. Seventh lens; 3. Third lens group; 31. Eighth lens; 32. Ninth lens; 33. Tenth lens; 34. Eleventh lens; 4. Fourth lens group; 41. Twelfth lens; 5. Fifth lens group; 51. Thirteenth lens; 52. Fourteenth lens; 6. Diaphragm; 7. Filter.

[0036] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0040] The utility model provides a zoom optical system, which aims to solve the problem that the existing zoom optical system of high-quality monitoring system cannot take into account the characteristics of small volume and large image surface, and cannot meet the space requirements of the lens while ensuring the imaging quality.

[0041] See also Figure 1 In one embodiment of the utility model, the zoom optical system 100 has an object side and an image side correspondingly arranged along the optical axis direction. 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 a fifth lens group 5 arranged in sequence from the object side to the image side. The second lens group 2 and the fourth lens group 4 are both movably arranged along the optical axis direction. The second lens group 2 is used for zooming, and the fourth lens group 4 is used for focusing. The total optical length of the zoom optical system 100 is controlled within 53 mm. The zoom optical system 100 is in a wide The focal length of the corner 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, the focal length of the fourth lens group 4 is f4, and the focal length of the fifth lens group 5 is f5, and the zoom optical system 100 satisfies the following conditions: 0.15≤fw / f1≤0.52; and -0.912≤fw / f2≤-0.642; and 0.2323≤fw / f3≤1.2; and 0.2458≤fw / f4≤1.2; and -0.052≤fw / f5≤-0.3.

[0042] In the technical solution of the present utility model, the first lens group 1, the third lens group 3 and the fifth lens group 5 are all fixed lens groups, the second lens group 2 is movably arranged along the optical axis direction to zoom the zoom optical system 100, and the fourth lens group 4 moves cooperatively along the optical axis direction to focus the zoom optical system 100, so that the zoom optical system 100 keeps the image of the image plane clear during the zooming process. In this way, the total optical length of the zoom optical system 100 is controlled within 53 mm by conditionally limiting the ratio of the focal length of the five lens groups to the focal length of the zoom optical system 100 at the wide-angle end, so as to meet the space requirements of the lens while ensuring the imaging quality, so as to provide a zoom optical system 100 with high imaging quality and small volume.

[0043] It should be noted that the present invention does not limit the specific driving form of the second lens group 2 and the fourth lens group 4 moving along the optical axis. In one embodiment of the present invention, the driving force for the second lens group 2 and the fourth lens group 4 moving along the optical axis may be driven by a driving motor; and in another embodiment of the present invention, the driving force for the second lens group 2 and the fourth lens group 4 moving along the optical axis may also be manually adjusted. The present invention does not impose any limitation on this, and it can be selected according to needs during actual setting.

[0044] It can be understood that, in the present invention, 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, the optical power of the fourth lens group 4 is positive, and the optical power of the fifth lens group 5 is negative. In this way, the imaging quality of the zoom optical system 100 is ensured by the coordination of multiple lens groups with reasonable optical powers.

[0045] In addition, in the present invention, the focal length of the zoom optical system 100 is f, 10.00 mm ≤ f ≤ 30.00 mm.

[0046] Specifically, in an embodiment of the present invention, the first lens group 1 includes a first lens 11 with negative optical power, a second lens 12 with positive optical power, and a third lens 13 with positive optical power, which are sequentially arranged along the optical axis.

[0047] In a specific embodiment of the present invention, the focal length of the first lens 11 is f11, the focal length of the second lens 12 is f12, and the focal length of the third lens 13 is f13, wherein -0.35≤f1 / f11≤-0.26; and 0.52≤f1 / f12≤0.71; and 0.60≤f1 / f13≤0.81.

[0048] It can be understood that the present invention does not limit the specific values ​​of the focal lengths of the first lens 11, the second lens 12 and the third lens 13. In an embodiment of the present invention, the first lens 11, the second lens 12 and the third lens 13 can be set to any value within a range.

[0049] Moreover, in this embodiment, the first lens 11 and the second lens 12 are glued together. Such a configuration can better correct the chromatic aberration of the zoom optical system 100. At the same time, the glued connection can also reduce the loss of light energy, increase the imaging clarity, and protect the scale surface, thereby further optimizing the processing flow to meet the design requirements. Therefore, the glued parts are used reasonably to allow optical components to improve the image quality of the optical system.

[0050] The second lens group 2 includes a fourth lens 21 with negative optical power, a fifth lens 22 with positive optical power, a sixth lens 23 with negative optical power, and a seventh lens 24 with positive optical power, which are sequentially arranged along the optical axis.

[0051] Specifically, in this embodiment, the focal length of the fourth lens 21 is f21, the focal length of the fifth lens 22 is f22, the focal length of the sixth lens 23 is f23, and the focal length of the seventh lens 24 is f24, wherein 0.64≤f2 / f21≤0.87; and -0.19≤f2 / f22≤-0.14; and 0.64≤f2 / f23≤0.87; and -0.52≤f2 / f23≤-0.39.

[0052] Similarly, in the present invention, the specific values ​​of the focal lengths of the fourth lens 21, the fifth lens 22, the sixth lens 23 and the seventh lens 24 may also be set to any value within a range, and the present invention does not impose any limitation on this.

[0053] It should also be noted that, in another embodiment of the present invention, the fifth lens 22 can be configured as a plastic lens. The use of a plastic lens can reduce the manufacturing cost of the zoom optical system 100 to achieve a low-cost effect of the zoom optical system 100 .

[0054] In addition, in another embodiment of the present invention, the sixth lens 23 and the seventh lens 24 are glued together to further reduce light energy loss, increase imaging clarity, protect the scale surface, and optimize the processing flow to meet design requirements.

[0055] In other embodiments of the present invention, the third lens group 3 includes an eighth lens 31 with positive optical power, a ninth lens 32 with positive optical power, a tenth lens 33 with negative optical power, and an eleventh lens 34 with negative optical power, which are arranged in sequence along the optical axis.

[0056] Specifically, the focal length of the eighth lens 31 is f31, the focal length of the ninth lens 32 is f32, the focal length of the tenth lens 33 is f33, and the focal length of the eleventh lens 34 is f34, wherein 0.99≤f3 / f31≤1.34; and 0.69≤f3 / f32≤0.93; and -0.62≤f3 / f33≤-0.46; and -6.74≤f3 / f34≤-4.98.

[0057] It can be understood that the present invention also does not limit the specific values ​​of the focal lengths of the eighth lens 31, the ninth lens 32, the tenth lens 33 and the eleventh lens 34. In the embodiment of the present invention, the eighth lens 31, the ninth lens 32, the tenth lens 33 and the eleventh lens 34 can be set to any value within a range.

[0058] To further reduce the manufacturing cost of the zoom optical system 100 , in another embodiment of the present invention, both the eighth lens 31 and the eleventh lens 34 can be configured as plastic lenses.

[0059] Meanwhile, in a further embodiment, the ninth lens 32 and the tenth lens 33 are glued together, so that the manufacturing cost of the zoom optical system 100 can be reduced while reducing light energy loss, thereby ensuring the imaging clarity of the zoom optical system 100 .

[0060] Further, in an embodiment of the present invention, the fourth lens group 4 includes twelfth lenses 41 with positive optical power arranged in sequence along the optical axis direction. It can be understood that since the fourth lens group 4 is composed of a single lens structure, the focal length f4 of the fourth lens group 4 and the focal length f41 between the twelfth lenses 41 satisfy the following condition: f4=f41, therefore, 0.2458≤fw / f41≤1.2.

[0061] Similarly, the focal length value of the specific embodiment of the twelfth lens 41 can be set to any value within a range, and can be selected according to actual needs during actual setting.

[0062] In addition, in another embodiment of the present invention, the twelfth lens 41 can be configured as a plastic lens, so as to reduce the manufacturing cost of the zoom optical system 100 and achieve a low-cost effect of the zoom optical system 100 .

[0063] Furthermore, the fifth lens group 5 includes a thirteenth lens 51 with positive optical power and a fourteenth lens 52 with negative optical power, which are sequentially arranged along the optical axis.

[0064] Specifically, the focal length of the thirteenth lens 51 is f51, and the focal length of the fourteenth lens 52 is f52, wherein -1.13≤f5 / f51≤-0.83; and 1.74≤f5 / f52≤2.35.

[0065] It can be understood that the present invention does not limit the specific values ​​of the thirteenth lens 51 and the fourteenth lens 52. In the embodiment of the present invention, the thirteenth lens 51 and the fourteenth lens 52 can be set to any value within a range.

[0066] In another embodiment of the present invention, the thirteenth lens 51 and the fourteenth lens 52 can be configured as plastic lenses to reduce the manufacturing cost of the zoom optical system 100 .

[0067] It should also be noted that, in the embodiment of the present utility model, the zoom optical system 100 further includes an aperture 6 and a filter 7. The aperture 6 is arranged between the second lens group 2 and the third lens group 3. The filter 7 is arranged on the side of the fourth lens group 4 facing the image side. The aperture 6 is used to adjust the light flux according to the actual situation to improve the imaging quality.

[0068] In addition, in the above embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 21, the sixth lens 23, the seventh lens 24, the eighth lens 31 and the ninth lens 32 can all be configured as glass lenses. In this configuration, the use of lenses made of glass can reduce the influence of temperature on the optical performance of the lens. The glass lens is not easily affected by thermal expansion and contraction and has a focus shift phenomenon. Therefore, the glass lens can well resist the problem of thermal deformation of the lens and maintain the high precision of the lens for a long time. The setting of the filter 7 can effectively filter out stray light in non-working bands to reduce optical noise, reduce difficulties for the subsequent optoelectronic module processing part, and thus improve the imaging quality.

[0069] Specifically, in a specific embodiment, the material refractive index, material Abbe number, curvature radius, and thickness interval of the lens in this embodiment are shown in Table 1 below:

[0070] Table 1

[0071]

[0072]

[0073] It can be understood that, in the present embodiment, the fifth lens 22, the eighth lens 31, the eleventh lens 34, the twelfth lens 41, the thirteenth lens 51 and the fourteenth lens 52 are all aspherical lenses. The characteristics of aspherical lenses are: the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens.

[0074] Accordingly, in the present embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 21, the sixth lens 23, the seventh lens 24, the eighth lens 31 and the ninth lens 32 are arranged in this way, and the spherical lens is used to reduce the cost while ensuring the image quality and reliability, and the assembly sensitivity is low, thereby improving the yield rate of finished products.

[0075] Further, in this embodiment, the aspheric surface shape of the aspheric lens satisfies the following conditions:

[0076]

[0077] Wherein, 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 coefficient of the conic quadratic curve (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 oblate circle), A, B, C, D, E, F, G, H are high-order aspheric coefficients (please refer to Table 2 below). The above parameters can be used to set the shape and size of the aspheric surfaces of the object side and image side of the lens.

[0078] Table 2 Conic coefficients and aspheric coefficients corresponding to aspheric lenses

[0079]

[0080]

[0081] With this setting, by reasonably allocating the lens power, adjusting the glass shape and material combination, effectively eliminating chromatic aberration and secondary spectrum, the spherical aberration, coma, astigmatism, etc. on each lens compensate and cancel each other out, so as to achieve a clear imaging effect and realize the optimal correction of high-order aberrations and chromatic aberrations.

[0082] In addition, in this embodiment, the target surface size of the zoom optical system 100 is φ, φ≤13.1 mm.

[0083] It should be further explained that, in this embodiment, the aperture of the zoom optical system 100 is Fno, and the aperture of the zoom optical system 100 is Fno, 1.70≤Fno≤1.81. In this way, the zoom optical system 100 has the characteristic of a large aperture, so that the zoom optical system 100 can still have an excellent imaging effect in a low-light environment, can meet the imaging requirements of bright and dark environments, and realize the night vision function.

[0084] In addition, the intervals between the lens groups of the zoom optical system 100 in this embodiment from the Wide end (wide-angle end) to the Tele end (telephoto end) are changed as follows:

[0085] Table 3

[0086] Surface number Wide Angle Telephoto 5 0.55 11.76 12 12.19 0.98 20 1.64 1.65 22 0.91 0.91

[0087] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in 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 correspondingly arranged along the optical axis direction, and comprises a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group arranged in sequence from the object side to the image side, the second lens group and the fourth lens group are both movably arranged along the optical axis direction, the second lens group is used for zooming, the fourth lens group is used for focusing, and the total optical length of the zoom optical system is controlled within 53 mm; 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, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5. The zoom optical system meets the following conditions: 0.15≤fw / f1≤0.52; and -0.912≤fw / f2≤-0.642; and 0.2323≤fw / f3≤1.2; and 0.2458≤fw / f4≤1.2; and -0.052≤fw / f5≤-0.

3.

2. The zoom optical system according to claim 1, wherein: The optical power of the first lens group is positive; The optical power of the second lens group is negative; The optical power of the third lens group is positive; The optical power of the fourth lens group is positive; The optical power of the fifth lens group is negative.

3. The zoom optical system according to claim 1, wherein: The first lens group comprises a first lens with negative optical power, a second lens with positive optical power and a third lens with positive optical power, which are sequentially arranged along the optical axis direction, and the first lens and the second lens are glued together; The focal length of the first lens is f11, the focal length of the second lens is f12, and the focal length of the third lens is f13, wherein -0.35≤f1 / f11≤-0.26; and 0.52≤f1 / f12≤0.71; and 0.60≤f1 / f13≤0.

81.

4. The zoom optical system according to claim 1, wherein: The second lens group comprises a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power and a seventh lens with positive optical power, which are sequentially arranged along the optical axis direction, and the sixth lens and the seventh lens are glued together; The focal length of the fourth lens is f21, the focal length of the fifth lens is f22, the focal length of the sixth lens is f23, and the focal length of the seventh lens is f24, wherein 0.64≤f2 / f21≤0.87; and -0.19≤f2 / f22≤-0.14; and 0.64≤f2 / f23≤0.87; and -0.52≤f2 / f23≤-0.

39.

5. The zoom optical system according to claim 1, wherein: The third lens group comprises an eighth lens with positive optical power, a ninth lens with positive optical power, a tenth lens with negative optical power and an eleventh lens with negative optical power, which are sequentially arranged along the optical axis direction, and the ninth lens and the tenth lens are glued together; The focal length of the eighth lens is f31, the focal length of the ninth lens is f32, the focal length of the tenth lens is f33, and the focal length of the eleventh lens is f34, wherein 0.99≤f3 / f31≤1.34; and 0.69≤f3 / f32≤0.93; and -0.62≤f3 / f33≤-0.46; and -6.74≤f3 / f34≤-4.

98.

6. The zoom optical system according to claim 1, wherein: The fourth lens group includes a twelfth lens with positive optical power; The focal length of the twelfth lens is f41, wherein 0.2458≤fw / f41≤1.

2.

7. The zoom optical system according to claim 1, wherein: The fifth lens group includes a thirteenth lens with positive focal power and a fourteenth lens with negative focal power which are arranged in sequence along the optical axis; The focal length of the thirteenth lens is f51, and the focal length of the fourteenth lens is f52, wherein -1.13≤f5 / f51≤-0.83; and 1.74≤f5 / f52≤2.

35.

8. The zoom optical system according to claim 1, wherein: The target surface size of the zoom optical system is φ, φ≤13.1 mm.

9. The zoom optical system according to claim 1, wherein: The aperture of the zoom optical system is Fno, 1.70≤Fno≤1.81; and / or, The focal length of the zoom optical system is f, 10mm≤f≤30mm.

10. The zoom optical system according to claim 1, wherein: The zoom optical system further includes an aperture and a filter. The aperture is arranged between the second lens group and the third lens group. The filter is arranged on a side of the fifth lens group facing the image side.

Images