A zoom lens

Abstract

An embodiment of the present invention discloses a zoom lens. The zoom lens includes a fixed lens group with positive optical power, a first variable magnification lens group with negative optical power, a second variable magnification lens group with positive optical power, and a compensation lens group with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis. The first variable magnification lens group and the second variable magnification lens group can reciprocate along the optical axis. The fixed lens group includes a first lens. The first variable magnification lens group includes a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side along the optical axis. The second variable magnification lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged in sequence from the object side to the image side along the optical axis. The compensation lens group includes a twelfth lens, a thirteenth lens, and a fourteenth lens arranged in sequence from the object side to the image side along the optical axis. The zoom lens provided by the embodiment of the present invention has an ultra-wide-angle constant large aperture and infrared confocal ability across the entire focal length range.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of lenses, and in particular, to a zoom lens. Background Art

[0002] Zoom lenses are becoming increasingly popular in the security monitoring market because their focal lengths are variable and thus can be applied to a variety of monitoring scenarios. Zoom lenses can be classified into constant aperture and non-constant aperture according to the aperture type; and can be classified into wide-angle zoom and telephoto zoom according to the angle. In the existing technology, the maximum angle of a constant aperture zoom lens is usually less than 76°, and the monitoring range is not wide enough; while for an ultra-wide angle zoom lens with a maximum angle above 130°, the aperture differences in different focal lengths are relatively large, resulting in obvious differences in the picture brightness of different focal lengths.

[0003] In recent years, the concept of super-large aperture starlight has gradually been recognized in the security field. In the era of networking and digitization, the pursuit of high definition in monitoring has led to an increasing demand for the light transmission amount of cameras. Generally speaking, the larger the light transmission amount, the better the low-light performance, the higher the signal-to-noise ratio, and the better the imaging effect. However, infrared supplementary lighting imaging is still required in a completely dark environment. Therefore, the lens needs to have infrared confocal ability. However, there is no lens on the market that simultaneously has technical parameters such as ultra-wide angle zoom, near-constant aperture, and F1.0 infrared confocal. Summary of the Invention

[0004] The embodiments of the present invention provide a zoom lens to provide a zoom lens with an ultra-wide angle constant large aperture (F1.0 - F1.2) and infrared confocal at all focal lengths.

[0005] The embodiments of the present invention provide a zoom lens, which includes a fixed lens group with positive optical power, a first varifocal lens group with negative optical power, a second varifocal lens group with positive optical power, and a compensation lens group with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side. The first varifocal lens group and the second varifocal lens group can reciprocally move along the optical axis;

[0006] The fixed lens group includes a first lens. The first varifocal lens group includes a second lens, a third lens, and a fourth lens arranged in sequence along the optical axis from the object side to the image side. The second varifocal lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged in sequence along the optical axis from the object side to the image side. The compensation lens group includes a twelfth lens, a thirteenth lens, and a fourteenth lens arranged in sequence along the optical axis from the object side to the image side.

[0007] Optionally, the optical power G of the fixed lens group and the optical power B of the compensation lens group satisfy: 0.2 ≤ |G / B| ≤ 2.5;

[0008] The optical power Z1 of the first variable magnification lens group and the optical power B of the compensating lens group satisfy: 3 ≤ |Z1 / B| ≤ 30;

[0009] The optical power Z2 of the second variable magnification lens group and the optical power B of the compensating lens group satisfy: 2 ≤ |Z2 / B| ≤ 25.

[0010] Optionally, the first lens has a positive optical power, the second lens has a negative optical power, the third lens has a negative optical power, the fourth lens has a positive optical power, the fifth lens has a positive optical power, the sixth lens has a negative optical power, the seventh lens has a negative optical power, the eighth lens has a positive optical power, the ninth lens has a negative optical power, the tenth lens has a positive optical power, the eleventh lens has a negative optical power, the twelfth lens has a positive optical power, the thirteenth lens has a positive optical power, and the fourteenth lens has a negative optical power.

[0011] Optionally, the optical power of the second lens is φ2, the optical power of the third lens is φ3, the optical power of the fourth lens is φ4, the optical power of the fifth lens is φ5, the optical power of the sixth lens is φ6, the optical power of the seventh lens is φ7, the optical power of the eighth lens is φ8, the optical power of the ninth lens is φ9, the optical power of the tenth lens is φ10, the optical power of the eleventh lens is φ11, the optical power of the twelfth lens is φ12, the optical power of the thirteenth lens is φ13, the optical power of the fourteenth lens is φ14, the optical power of the first variable magnification lens group is Z1, the optical power of the second variable magnification lens group is Z2, and the optical power of the compensating lens group is B;

[0012] Among them, the optical powers of the second lens to the fourteenth lens satisfy the following conditions:

[0013] 0.3 ≤ |φ2 / Z1| ≤ 2.1; 0.3 ≤ |φ3 / Z1| ≤ 2.0, 0.15 ≤ |φ4 / Z1| ≤ 1.5;

[0014] 0.15 ≤ |φ5 / Z2| ≤ 1.5; 0.05 ≤ |φ6 / Z2| ≤ 0.8; 0.08 ≤ |φ7 / Z2| ≤ 1;

[0015] 0.35 ≤ |φ8 / Z2| ≤ 2.5; 0.25 ≤ |φ9 / Z2| ≤ 2.2; 0.4 ≤ |φ10 / Z2| ≤ 3.9;

[0016] 0.05 ≤ |φ11 / Z2| ≤ 0.85; 0.8 ≤ |φ12 / B| ≤ 5.5; 3.5 ≤ |φ13 / B| ≤ 55;

[0017] 4 ≤ |φ14 / B| ≤ 45.

[0018] Optionally, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, the refractive index of the seventh lens is n7, the refractive index of the eighth lens is n8, the refractive index of the ninth lens is n9, the refractive index of the tenth lens is n10, the refractive index of the eleventh lens is n11, the refractive index of the twelfth lens is n12, and the refractive index of the thirteenth lens is n13, and the refractive index of the fourteenth lens is n14;

[0019] Among them, the refractive indices of the first lens to the fourteenth lens satisfy the following conditions:

[0020] 1.6 ≤ n1 ≤ 2.15; 1.58 ≤ n2 ≤ 1.95; 1.43 ≤ n3 ≤ 1.75; 1.71 ≤ n4 ≤ 2.15;

[0021] 1.4 ≤ n5 ≤ 1.75; 1.55 ≤ n6 ≤ 1.95; 1.55 ≤ n7 ≤ 1.95; 1.4 ≤ n8 ≤ 1.75;

[0022] 1.65 ≤ n9 ≤ 2.15; 1.4 ≤ n10 ≤ 1.75; 1.7 ≤ n11 ≤ 2.15; 1.65 ≤ n12 ≤ 2.15;

[0023] 1.7 ≤ n13 ≤ 2.15; 1.65 ≤ n14 ≤ 2.1.

[0024] Optionally, the seventh lens and the eighth lens form a doublet lens, the ninth lens, the tenth lens, and the eleventh lens form a triplet lens, and the thirteenth lens and the fourteenth lens form a doublet lens.

[0025] Optionally, the first lens, the second lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the thirteenth lens, and the fourteenth lens are all spherical lenses, and the third lens, the fifth lens, and the twelfth lens are all aspherical lenses.

[0026] Optionally, the aperture of the zoom lens satisfies: 0.9 ≤ Fw~Ft ≤ 1.4;

[0027] Among them, Fw represents the aperture of the zoom lens at the wide-angle end, and Ft represents the aperture of the zoom lens at the telephoto end.

[0028] Optionally, the field of view angle of the zoom lens satisfies: 90° ≤ FOV-w; FOV-t ≤ 65°;

[0029] Wherein, FOV-w represents the field of view angle of the zoom lens at the wide-angle end, and FOV-t represents the field of view angle of the zoom lens at the telephoto end.

[0030] Optionally, the image plane diameter IC of the zoom lens and the total lens length TTL of the zoom lens satisfy: 0.02 ≤ IC / TTL ≤ 1.2.

[0031] The zoom lens provided by the embodiment of the present invention realizes the zoom of the lens by reciprocating movement of the first variable magnification lens group and the second variable magnification lens group along the optical axis. By reasonably setting the number of lenses included in each lens group and the optical power of each lens group, the aberration can be corrected well, ensuring the clarity of the image in different focal length states, so that the zoom lens has an ultra-wide-angle constant large aperture (F1.0 - F1.2) and full focal length infrared confocal ability. Moreover, the zoom lens has a maximum angle of more than 135° at the wide-angle end, can be applied to a 1 / 1.8〞 large target surface photosensitive chip, and meets the use conditions of -40°C - 80°C. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some specific embodiments of the present invention. For those skilled in the art, according to the basic concepts of the device structure, driving method, and manufacturing method disclosed and prompted by various embodiments of the present invention, they can be extended and extended to other structures and drawings. Undoubtedly, these should be within the scope of the claims of the present invention.

[0033] Figure 1 Schematic structural diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end;

[0034] Figure 2 Schematic structural diagram of the zoom lens provided by Embodiment 1 of the present invention at the telephoto end;

[0035] Figure 3 Spherical aberration curve diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end;

[0036] Figure 4 Ray fan diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end;

[0037] Figure 5 Spot diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end;

[0038] Figure 6 Field curvature and distortion diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end;

[0039] Figure 7 Spherical aberration curve of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0040] Figure 8 Ray fan diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0041] Figure 9 Spot diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0042] Figure 10 Field curvature and distortion diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0043] Figure 11 Schematic structural diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0044] Figure 12 Schematic structural diagram of the zoom lens provided in Embodiment 2 of the present invention at the telephoto end;

[0045] Figure 13 Spherical aberration curve of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0046] Figure 14 Ray fan diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0047] Figure 15 Spot diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0048] Figure 16 Field curvature and distortion diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0049] Figure 17 Spherical aberration curve of the zoom lens provided in Embodiment 2 of the present invention at the telephoto end;

[0050] Figure 18 Ray fan diagram of the zoom lens provided in Embodiment 2 of the present invention at the telephoto end;

[0051] Figure 19 Spot diagram of the zoom lens provided in Embodiment 2 of the present invention at the telephoto end;

[0052] Figure 20 Field curvature and distortion diagram of the zoom lens provided in Embodiment 2 of the present invention at the telephoto end;

[0053] Figure 21 Schematic structural diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end;

[0054] Figure 22Schematic diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end;

[0055] Figure 23 Spherical aberration curve diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end;

[0056] Figure 24 Ray fan diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end;

[0057] Figure 25 Spot diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end;

[0058] Figure 26 Field curvature and distortion diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end;

[0059] Figure 27 Spherical aberration curve diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end;

[0060] Figure 28 Ray fan diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end;

[0061] Figure 29 Spot diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end;

[0062] Figure 30 Field curvature and distortion diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end. Detailed implementation manners

[0063] To make the objectives, technical solutions and advantages of the present invention clearer, the following will refer to the accompanying drawings in the embodiments of the present invention and clearly and completely describe the technical solutions of the present invention through implementation manners. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Based on the basic concepts disclosed and prompted in the embodiments of the present invention, all other embodiments obtained by those skilled in the art fall within the protection scope of the present invention.

[0064] Embodiment 1

[0065] Figure 1 Schematic diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end, Figure 2 Schematic diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end, refer to Figure 1 and Figure 2, the zoom lens provided in the first embodiment of the present invention includes a fixed lens group 100 with positive optical power, a first variable magnification lens group 200 with negative optical power, a second variable magnification lens group 300 with positive optical power, and a compensation lens group 400 with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis. The first variable magnification lens group 200 and the second variable magnification lens group 300 can reciprocate along the optical axis; the fixed lens group 100 includes a first lens 1, the first variable magnification lens group 200 includes a second lens 2, a third lens 3, and a fourth lens 4 arranged in sequence from the object side to the image side along the optical axis, the second variable magnification lens group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11 arranged in sequence from the object side to the image side along the optical axis, and the compensation lens group 400 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 arranged in sequence from the object side to the image side along the optical axis.

[0066] Exemplarily, referring to Figure 1 and Figure 2 , the zoom lens provided in the embodiment of the present invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens 1 serves as the fixed lens group 100 for converging external light. The second lens 2, the third lens 3, and the fourth lens 4 form the first variable magnification lens group 200, and the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, and the eleventh lens 11 form the second variable magnification lens group 300. Both the first variable magnification lens group 200 and the second variable magnification lens group 300 can move along the optical axis, enabling the focal length of the zoom lens to continuously change from wide-angle to telephoto, ensuring high image quality at each focal position of the zoom lens while ensuring the miniaturization of the zoom lens. The twelfth lens 12, the thirteenth lens 13, and the fourteenth lens 14 form the compensation lens group 400. The compensation lens group 400 is arranged behind the second variable magnification lens group 40 and is used to compensate for various aberrations formed during the imaging process. In the embodiment of the present invention, the fixed lens group 100, the first variable magnification lens group 200, the second variable magnification lens group 300, and the compensation lens group 400 can be arranged in a lens barrel ( Figure 1 and Figure 2 not shown in the figure). In addition, the zoom lens may further include a diaphragm 500. The diaphragm 500 is located in the optical path between the first variable magnification lens group 200 and the second variable magnification lens group 300. The diaphragm 500 can adjust the propagation direction of the light beam, which is beneficial to improving the imaging quality.

[0067] It can be understood that during the zooming process of the zoom lens by moving the first variator lens group 200 and the second variator lens group 300, when the focal length is the shortest, the zoom lens is at the wide-angle end, and when the focal length is the longest, the zoom lens is at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical powers, and also has different lengths or forms.

[0068] Furthermore, the optical power is the reciprocal of the focal length and represents the ability of an optical system to deflect light rays. The larger the absolute value of the optical power, the stronger the ability to bend light rays, and the smaller the absolute value of the optical power, the weaker the ability to bend light rays. When the optical power is positive, the refraction of light rays is convergent; when the optical power is negative, the refraction of light rays is divergent. The optical power can be used to represent a single lens or a system formed by multiple lenses, i.e., a lens group. In this embodiment, by setting the fixed lens group 100 to have a positive optical power, the first variator lens group 200 to have a negative optical power, the second variator lens group 300 to have a positive optical power, and the compensating lens group 400 to have a positive optical power, the optical powers of the fixed lens group 100, the first variator lens group 200, the second variator lens group 300, and the compensating lens group 400 cooperate with each other to compensate for the aberration caused during the zooming movement of the first variator lens group 200 and the second variator lens group 300, ensuring the clarity of the image at different focal length states.

[0069] The zoom lens provided by the embodiment of the present invention realizes the zooming of the lens by reciprocally moving the first variator lens group and the second variator lens group along the optical axis. By reasonably setting the number of lenses included in each lens group and the optical power of each lens group, the aberration can be corrected well, ensuring the clarity of the image at different focal length states, enabling the zoom lens to have an ultra-wide-angle constant large aperture (F1.0 - F1.2) and full-focal-length infrared confocal ability, and the zoom lens having a maximum angle of more than 135° at the wide-angle end, being applicable to a 1 / 1.8〞 large target surface photosensitive chip, and meeting the use conditions of -40°C - 80°C.

[0070] Reference Figure 1 and Figure 2 , on the basis of the above embodiment, optionally, the optical power G of the fixed lens group 100 and the optical power B of the compensating lens group 400 satisfy: 0.2 ≤ |G / B| ≤ 2.5; the optical power Z1 of the first variator lens group 200 and the optical power B of the compensating lens group 400 satisfy: 3 ≤ |Z1 / B| ≤ 30; the optical power Z2 of the second variator lens group 300 and the optical power B of the compensating lens group 400 satisfy: 2 ≤ |Z2 / B| ≤ 25.

[0071] By reasonably setting the focal power ratio relationships of the fixed lens group 100, the first variable magnification lens group 200, the second variable magnification lens group 300, and the compensation lens group 400, and enabling their mutual cooperation, a zoom lens with an ultra-wide angle constant large aperture (F1.0 - F1.2) and infrared confocal at the entire focal length can be achieved.

[0072] Optionally, the first lens 1 has a positive focal power, the second lens 2 has a negative focal power, the third lens 3 has a negative focal power, the fourth lens 4 has a positive focal power, the fifth lens 5 has a positive focal power, the sixth lens 6 has a negative focal power, the seventh lens 7 has a negative focal power, the eighth lens 8 has a positive focal power, the ninth lens 9 has a negative focal power, the tenth lens 10 has a positive focal power, the eleventh lens 11 has a negative focal power, the twelfth lens 12 has a positive focal power, the thirteenth lens 13 has a positive focal power, and the fourteenth lens 14 has a negative focal power.

[0073] By reasonably matching the focal powers of each lens, chromatic aberration can be corrected well, and at the same time, no defocusing occurs within the temperature range of -40°C to 80°C, achieving a zoom lens with an ultra-wide angle constant large aperture (F1.0 - F1.2) and infrared confocal at the entire focal length.

[0074] Optionally, the focal power of the second lens 2 is φ2, the focal power of the third lens 3 is φ3, the focal power of the fourth lens 4 is φ4, the focal power of the fifth lens 5 is φ5, the focal power of the sixth lens 6 is φ6, the focal power of the seventh lens 7 is φ7, the focal power of the eighth lens 8 is φ8, the focal power of the ninth lens 9 is φ9, the focal power of the tenth lens 10 is φ10, the focal power of the eleventh lens 11 is φ11, the focal power of the twelfth lens 12 is φ12, the focal power of the thirteenth lens 13 is φ13, the focal power of the fourteenth lens 14 is φ14, the focal power of the first variable magnification lens group 200 is Z1, the focal power of the second variable magnification lens group 300 is Z2, and the focal power of the compensation lens group 400 is B; among them, the focal powers of the second lens 2 to the fourteenth lens 14 satisfy the following conditions:

[0075] 0.3 ≤ |φ2 / Z1| ≤ 2.1; 0.3 ≤ |φ3 / Z1| ≤ 2.0, 0.15 ≤ |φ4 / Z1| ≤ 1.5;

[0076] 0.15 ≤ |φ5 / Z2| ≤ 1.5; 0.05 ≤ |φ6 / Z2| ≤ 0.8; 0.08 ≤ |φ7 / Z2| ≤ 1;

[0077] 0.35 ≤ |φ8 / Z2| ≤ 2.5; 0.25 ≤ |φ9 / Z2| ≤ 2.2; 0.4 ≤ |φ10 / Z2| ≤ 3.9;

[0078] 0.05 ≤ |φ11 / Z2| ≤ 0.85; 0.8 ≤ |φ12 / B| ≤ 5.5; 3.5 ≤ |φ13 / B| ≤ 55;

[0079] 4 ≤ |φ14 / B| ≤ 45.

[0080] In the embodiment of the present invention, by reasonably setting the relationship between the optical power ratios of the lenses in each lens group and the corresponding lens groups, it is beneficial to correct aberrations better and ensure the clarity of images in different focal length states.

[0081] As a feasible embodiment, the refractive index of the first lens 1 is n1, the refractive index of the second lens 2 is n2, the refractive index of the third lens 3 is n3, the refractive index of the fourth lens 4 is n4, the refractive index of the fifth lens 5 is n5, the refractive index of the sixth lens 6 is n6, the refractive index of the seventh lens 7 is n7, the refractive index of the eighth lens 8 is n8, the refractive index of the ninth lens 9 is n9, the refractive index of the tenth lens 10 is n10, the refractive index of the eleventh lens 11 is n11, the refractive index of the twelfth lens 12 is n12, the refractive index of the thirteenth lens 13 is n13, and the refractive index of the fourteenth lens 14 is n14; wherein, the refractive indices of the first lens 1 to the fourteenth lens 14 satisfy the following conditions:

[0082] 1.6 ≤ n1 ≤ 2.15; 1.58 ≤ n2 ≤ 1.95; 1.43 ≤ n3 ≤ 1.75; 1.71 ≤ n4 ≤ 2.15;

[0083] 1.4 ≤ n5 ≤ 1.75; 1.55 ≤ n6 ≤ 1.95; 1.55 ≤ n7 ≤ 1.95; 1.4 ≤ n8 ≤ 1.75;

[0084] 1.65 ≤ n9 ≤ 2.15; 1.4 ≤ n10 ≤ 1.75; 1.7 ≤ n11 ≤ 2.15; 1.65 ≤ n12 ≤ 2.15;

[0085] 1.7 ≤ n13 ≤ 2.15; 1.65 ≤ n14 ≤ 2.1.

[0086] Wherein, the refractive index is the ratio of the speed of light in vacuum to the speed of light in the medium, mainly used to describe the refractive ability of the material to light, and the refractive indices of different materials are different. In the embodiment of the present invention, by matching the refractive indices of the lenses in the zoom lens, it is beneficial to realize the miniaturized design of the zoom lens; at the same time, it is also beneficial to achieve a higher pixel resolution and a larger aperture.

[0087] Reference Figure 1 and Figure 2, optionally, the seventh lens 7 and the eighth lens 8 form a doublet lens, the ninth lens 9, the tenth lens 10 and the eleventh lens 11 form a triplet lens, and the thirteenth lens 13 and the fourteenth lens 14 form a doublet lens.

[0088] Gluing of lenses can effectively reduce the air gap between lenses, thereby reducing the overall length of the lens, making the overall structure of the zoom lens compact and meeting the miniaturization requirements. In addition, the glued lens is beneficial to eliminating chromatic aberration, so that various aberrations of the zoom lens can be fully corrected. On the premise of a compact structure, the resolution can be improved, and the optical performance such as distortion and CRA can be optimized; and the light loss caused by reflection between lenses can be reduced, the illuminance can be increased, thereby improving the image quality and enhancing the clarity of the lens imaging. In addition, the use of the glued lens can also reduce the assembly components between two lenses, simplify the assembly procedure in the lens manufacturing process, reduce costs, and reduce the tolerance sensitivity problems such as tilt / eccentricity generated during the assembly of the lens unit.

[0089] Reference Figure 1 and Figure 2 , optionally, the first lens 1, the second lens 2, the fourth lens 4, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the thirteenth lens 13 and the fourteenth lens 14 are all spherical lenses. The third lens 3, the fifth lens 5 and the twelfth lens 12 are all aspherical lenses.

[0090] Specifically, the characteristic of a spherical lens is that it has a constant curvature from the center of the lens to the periphery of the lens, ensuring a simple setting method of the lens. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using the aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality of the lens. In this embodiment, some lenses in the zoom lens are set as spherical lenses and some lenses are set as aspherical lenses. The spherical lenses and the aspherical lenses cooperate with each other, which can improve the imaging quality of the zoom lens and simplify the setting method of the zoom lens at the same time.

[0091] Further, the materials of the lenses in the zoom lens can be set according to actual requirements. Exemplarily, the first lens 1, the second lens 2, the fourth lens 4, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, the thirteenth lens 13, and the fourteenth lens 14 can all be glass spherical lenses, and the third lens 3, the fifth lens 5, and the twelfth lens 12 can all be plastic aspherical lenses. Among them, glass spherical lenses are easy to process, and the cost of lenses made of plastic material is much lower than that of lenses made of glass material. By adopting the method of mixing glass lenses and plastic lenses, the cost of the fixed-focus lens can be effectively controlled while ensuring the optical performance of the fixed-focus lens; at the same time, the materials of the lenses have a mutual compensation effect, which can ensure normal use in high and low temperature environments. It can be understood that in other embodiments, the third lens 3, the fifth lens 5, and the twelfth lens 12 can also all be glass aspherical lenses.

[0092] Among them, the material of the plastic aspherical lens can be various plastics known to those skilled in the art, and the material of the glass spherical lens is various types of glass known to those skilled in the art. The embodiments of the present invention will not elaborate or limit this.

[0093] Optionally, the aperture of the zoom lens satisfies: 0.9 ≤ Fw~Ft ≤ 1.4; where Fw represents the aperture of the zoom lens at the wide-angle end, and Ft represents the aperture of the zoom lens at the telephoto end.

[0094] The zoom lens provided by the embodiments of the present invention is a super-wide-angle constant large-aperture (F1.0~F1.2) zoom lens. The aperture Fw of the zoom lens at the wide-angle end and the aperture Ft at the telephoto end reach 0.9~1.4, meeting the requirement of a large light throughput and satisfying the monitoring requirements under low illumination conditions.

[0095] Optionally, the field of view angle of the zoom lens satisfies: 90° ≤ FOV-w; FOV-t ≤ 65°; where FOV-w represents the field of view angle of the zoom lens at the wide-angle end, and FOV-t represents the field of view angle of the zoom lens at the telephoto end.

[0096] The zoom lens provided by the embodiments of the present invention has a large field of view angle. The field of view angle at the wide-angle end can reach more than 90°, and further can reach a maximum angle of more than 135°. The field of view angle at the telephoto end can reach more than 60°, meeting the requirement of a large field of view. Optionally, the image plane diameter IC of the zoom lens and the total lens length TTL of the zoom lens satisfy: 0.02 ≤ IC / TTL ≤ 1.2.

[0097] The effective image plane diameter of the zoom lens is IC (Image circle), and the distance from the optical axis center of the object side of the first lens 1 to the image plane is the total optical length TTL. By reasonably setting the relationship between the image plane diameter and the lens total length, while meeting the image plane requirements, the total length of the optical lens is reduced, the miniaturization of the zoom lens is achieved, and it is beneficial for later assembly.

[0098] In summary, the zoom lens provided by the embodiment of the present invention, by reasonably distributing the optical power, provides a zoom lens with an ultra-wide angle constant large aperture (F1.0~F1.2) and infrared confocal at all focal lengths. The wide-angle end has a maximum angle of more than 135°, can be applied to a 1 / 1.8〞 large target surface photosensitive chip, meets the use conditions of -40℃ - 80℃, and realizes a zoom lens with ultra-wide angle, constant large aperture, large target surface and small volume.

[0099] Exemplarily, Table 1, in a feasible implementation manner, details the specific optical physical parameters of each lens in the zoom lens provided by Embodiment 1 of the present invention. The zoom lens in Table 1 corresponds to Figure 1 and Figure 2 the zoom lens shown.

[0100] Table 1 Optical physical parameters of the first lens to the fourteenth lens

[0101] Surface number Surface type Radius of curvature Thickness Material (nd) Material (vd) K coefficient 1 Spherical surface 39.352 2.586 1.91 22.67 2 Spherical surface 56.057 Variable spacing 1 3 Spherical surface 56.909 0.95 1.73 55 4 Spherical surface 9.964 7.146 5 Aspherical surface -19.516 0.732 1.59 60.47 2.132 6 Aspherical surface 22.368 0.097 -14.124 7 Spherical surface 22.456 4.648 1.95 17.75 8 Spherical surface 179.768 Variable spacing 2 STO PL INF Variable spacing 3 10 Aspherical surface 60.951 2 1.62 63 45.032 11 Aspherical surface -30.535 1.624 -7.817 12 Spherical surface -12.381 1.869 1.80 47.66 13 Spherical surface -17.391 0.058 14 Spherical surface 35.382 0.768 1.65 41.72 15 Spherical surface 16.433 6.699 1.59 67.75 16 Spherical surface -16.509 0.118 17 Spherical surface 28.985 0.947 1.81 26 18 Spherical surface 10.569 6.22 1.59 68.62 19 Spherical surface -15.185 1.111 2 28.29 20 Spherical surface -28.27 Variable spacing 4 21 Aspherical surface 35.863 1.512 1.86 41.64 -39.157 22 Aspherical surface 131.359 0.063 8.872 23 Spherical surface 21.814 3.535 1.99 16.83 24 Spherical surface -15.022 0.748 1.85 23.1 25 Spherical surface 11.659

[0102] The surface numbers in Table 1 are numbered according to the surface order of each lens. For example, "1" represents the object surface of the first lens 1, "2" represents the image surface of the first lens 1, "3" represents the object surface of the second lens 2, "4" represents the image surface of the second lens 2, and so on. Among them, "15" is the cemented surface of the seventh lens 7 and the eighth lens 8, "18" is the cemented surface of the ninth lens 9 and the tenth lens 10, "19" is the cemented surface of the tenth lens 10 and the eleventh lens 11, and "24" is the cemented surface of the thirteenth lens 13 and the fourteenth lens 14. The radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface. The units of the radius of curvature and the thickness are both millimeters (mm); the material (nd) is the refractive index, representing the deflection ability of the material between the current surface and the next surface to light. A space represents that the current position is air and the refractive index is 1; the material (vd) is the dispersion coefficient, representing the dispersion characteristics of the material between the current surface and the next surface to light. A space represents that the current position is air; the K value represents the numerical value of the best fitting conic coefficient of the aspherical surface; STO represents the aperture stop.

[0103] Table 2 shows a design value of the variable pitch in Table 1:

[0104] Design values of the variable pitch of the zoom lens at the wide-angle end and the telephoto end in Table 2

[0105] Wide-angle end Telephoto end Variable spacing 1 0.735 11.45 Variable spacing 2 11.78 1.07 Variable spacing 3 6.81 1.19 Variable spacing 4 0.8 5.05

[0106] The aspherical surface shape equation z satisfies:

[0107]

[0108] where Z represents the distance sagitta from the vertex of the aspherical surface at the position with height y along the optical axis; c = 1 / R, and R represents the paraxial curvature radius of the mirror surface; k is the conic coefficient; A, B, C, D, and E represent the high-order aspherical coefficients.

[0109] Table 3 shows the aspherical coefficients of each lens in the zoom lens provided in the first embodiment of the present invention:

[0110] Design values of the aspherical coefficients of each lens in the zoom lens in Table 3

[0111] Surface number A B C D E F 5 -2.118E-5 8.551E-7 -1.507E-8 1.383E-10 2.024E-15 0 6 8.638E-5 -6.376E-7 -2.839E-9 9.554E-11 -7.832E-15 0 10 -1.006E-4 -1.661E-7 -7.062E-9 1.245E-10 -2.501E-12 1.561E-15 11 -1.128E-5 6.584E-7 4.344E-10 7.722E-11 4.026E-14 1.496E-15 21 7.544E-5 -2.01E-6 5.678E-8 -4.12E-10 -1.656E-13 -2.14E-15 22 9.41E-6 -6.616E-7 5.023E-8 -4.305E-10 -1.9E-13 -9.765E-16

[0112] where -2.118E-5 means that the coefficient A of the surface number 5 is -2.118×10 -5 , and so on.

[0113] The zoom lens provided in the first embodiment of the present invention has reached the following technical indicators:

[0114] Table 4 Technical indicators of the zoom lens

[0115] Wide-angle end Telephoto end Aperture 0.999 1.19 Focal length 4.65 10.14 Field of view angle 136° 52°

[0116] Figure 3 is the spherical aberration curve of the zoom lens provided in the first embodiment of the present invention at the wide-angle end. As Figure 3 shown, the spherical aberration of the zoom lens at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) is within 0.036mm, and the curves at different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Thus, it can be known that the zoom lens provided in the embodiment of the present invention can correct aberrations well at the wide-angle end.

[0117] Figure 4 is the ray fan diagram of the zoom lens provided in the first embodiment of the present invention at the wide-angle end. As Figure 4As shown, the imaging ranges of light rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at different field angles of this zoom lens are all within 20μm and the curves are very concentrated, ensuring that the aberration in different field regions is small, which also means that this zoom lens well corrects the aberration of the optical system at the wide-angle end.

[0118] Figure 5 The spot diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end is shown. Among them, the spot diagram is one of the most commonly used evaluation methods in modern optical design. The spot diagram refers to that many light rays emitted from a point light source pass through an optical system, and due to aberration, their intersection points with the image plane are no longer concentrated at the same point, but form a diffuse pattern scattered within a certain range. As Figure 5 shown, for the zoom lens provided in the embodiment of the present invention, the diffuse patterns of light rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at each field are relatively concentrated and the distribution is also relatively uniform. There is no phenomenon that the diffuse pattern at a certain field is separated up and down significantly with the wavelength, indicating no obvious purple fringing. At the same time, the root mean square radius values (RMS radii) of light rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at each field position of this zoom lens are 1.371μm, 2.854μm, 1.587μm, 3.173μm, 3.051μm, and 3.556μm respectively, indicating that the RMS radii of each field are all less than 4μm, which also means that this zoom lens has low chromatic aberration and aberration at the wide-angle end, solves the purple fringing problem of imaging in each band, and can achieve high-resolution imaging.

[0119] Figure 6 The field curvature and distortion diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end is shown. As Figure 6 shown, in the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without a unit; where T represents meridian and S represents sagittal; from Figure 6 it can be seen that for the zoom lens provided in this embodiment, from the light with a wavelength of 435nm to the light with a wavelength of 850nm, the field curvature is effectively controlled, that is, when imaging, the image quality at the center and the image quality at the periphery have a small difference; in the right coordinate system, the horizontal coordinate represents the magnitude of distortion, with the unit of %; the vertical coordinate represents the normalized image height, without a unit; from Figure 6 it can be seen that the distortion of the zoom lens provided in this embodiment at the wide-angle end is well corrected, the imaging distortion is small, and it meets the requirement of low distortion.

[0120] Figure 7This is the spherical aberration curve graph of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end, as Figure 7 shown. The spherical aberration of this zoom lens at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) is within 0.05mm. The curves at different wavelengths are relatively concentrated, indicating that the axial aberration of this zoom lens is small. Thus, it can be known that the zoom lens provided in the embodiment of the present invention can correct aberration well at the telephoto end.

[0121] Figure 8 This is the ray fan graph of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end, as Figure 8 shown. The imaging ranges of light rays at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) of this zoom lens at different field angles are all within 20μm and the curves are very concentrated, ensuring that the aberration in different field regions is small, that is, it shows that this zoom lens corrects the aberration of the optical system well at the telephoto end.

[0122] Figure 9 This is the spot diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end, as Figure 9 shown. For the zoom lens provided in the embodiment of the present invention, the dispersion patterns of light rays at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at each field are relatively concentrated and the distribution is relatively uniform. There is no phenomenon that the dispersion patterns at a certain field are widely separated up and down with the wavelength, indicating no obvious purple fringing. At the same time, the root mean square radius values (RMS radii) of light rays at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at each field position of this zoom lens are 2.167μm, 2.288μm, 2.242μm, 2.308μm, 2.436μm, and 3.171μm respectively, indicating that the RMS radii of each field are less than 4μm, that is, it shows that this zoom lens has low chromatic aberration and aberration at the telephoto end, solves the purple fringing problem of imaging in each band, and can achieve high-resolution imaging.

[0123] Figure 10 This is the field curvature and distortion graph of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end, as Figure 10 shown. In the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without a unit; where T represents meridional and S represents sagittal; from Figure 10It can be seen that for the zoom lens provided in this embodiment, from light with a wavelength of 435 nm to light with a wavelength of 850 nm, the field curvature is effectively controlled, that is, when imaging, the image quality difference between the center and the periphery is small; in the right coordinate system, the horizontal coordinate represents the magnitude of distortion, with the unit of %; the vertical coordinate represents the normalized image height, without a unit; from Figure 10 It can be seen that the distortion of the zoom lens provided in this embodiment at the telephoto end is well corrected, the imaging distortion is small, and the requirement of low distortion is met.

[0124] Embodiment 2

[0125] Figure 11 FIG. is a schematic structural diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end, Figure 12 FIG. is a schematic structural diagram of the zoom lens provided in Embodiment 2 of the present invention at the telephoto end. Referring to Figure 11 and Figure 12 The zoom lens provided in Embodiment 2 of the present invention includes a fixed lens group 100 with a positive optical power, a first varifocal lens group 200 with a negative optical power, a second varifocal lens group 300 with a positive optical power, and a compensating lens group 400 with a positive optical power, which are arranged in sequence along the optical axis from the object side to the image side. The first varifocal lens group 200 and the second varifocal lens group 300 can reciprocate along the optical axis; the fixed lens group 100 includes a first lens 1, the first varifocal lens group 200 includes a second lens 2, a third lens 3, and a fourth lens 4 arranged in sequence along the optical axis from the object side to the image side, the second varifocal lens group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11 arranged in sequence along the optical axis from the object side to the image side, and the compensating lens group 400 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 arranged in sequence along the optical axis from the object side to the image side. The first lens 1 has a positive optical power, the second lens 2 has a negative optical power, the third lens 3 has a negative optical power, the fourth lens 4 has a positive optical power, the fifth lens 5 has a positive optical power, the sixth lens 6 has a negative optical power, the seventh lens 7 has a negative optical power, the eighth lens 8 has a positive optical power, the ninth lens 9 has a negative optical power, the tenth lens 10 has a positive optical power, the eleventh lens 11 has a negative optical power, the twelfth lens 12 has a positive optical power, the thirteenth lens 13 has a positive optical power, and the fourteenth lens 14 has a negative optical power. Among them, the seventh lens 7 and the eighth lens 8 form a doublet lens, the ninth lens 9, the tenth lens 10, and the eleventh lens 11 form a triplet lens, and the thirteenth lens 13 and the fourteenth lens 14 form a doublet lens. The aperture stop 500 is located in the optical path between the first varifocal lens group 200 and the second varifocal lens group 300.

[0126] Exemplarily, Table 5 details the specific optical physical parameters of each lens in the zoom lens provided in the second embodiment of the present invention in a feasible implementation manner. The zoom lens in Table 5 corresponds to Figure 11 and Figure 12 the zoom lens shown.

[0127] Optical Physical Parameters of the First to Fourteenth Lenses in Table 5

[0128] Surface number Surface type Radius of curvature Thickness Material (nd) Material (vd) K coefficient 1 Spherical surface 36.268 2.586 1.97 28 2 Spherical surface 51.031 Variable spacing 1 3 Spherical surface 54.504 0.95 1.79 61.9 4 Spherical surface 10.027 7.126 5 Aspherical surface -19.646 0.622 1.58 55 2.161 6 Aspherical surface 22.663 0.142 -14.215 7 Spherical surface 22.438 4.606 1.95 17.8 8 Spherical surface 187.703 Variable spacing 2 STO PL INF Variable spacing 3 10 Aspherical surface 60.664 2.118 1.62 54.4 45.293 11 Aspherical surface -30.244 1.563 -7.846 12 Spherical surface -12.4 1.886 1.84 49.2 13 Spherical surface -17.359 0.05 14 Spherical surface 35.283 0.625 1.65 42.4 15 Spherical surface 16.425 6.637 1.59 66.8 16 Spherical surface -16.513 0.13 17 Spherical surface 28.821 0.993 1.85 25.9 18 Spherical surface 10.614 6.33 1.59 70.3 19 Spherical surface -15.222 1.147 2 27.3 20 Spherical surface -28.173 Variable spacing 4 21 Aspherical surface 35.477 1.558 1.87 32.2 -38.095 22 Aspherical surface 133.060 0.065 5.201 23 Spherical surface 21.763 3.565 1.99 17.1 24 Spherical surface -14.751 0.771 1.84 22.7 25 Spherical surface 11.685

[0129] The surface numbers in Table 5 are numbered according to the surface order of each lens. For example, "1" represents the object surface of the first lens 1, "2" represents the image surface of the first lens 1, and so on. Among them, "15" is the cemented surface of the seventh lens 7 and the eighth lens 8, "18" is the cemented surface of the ninth lens 9 and the tenth lens 10, "19" is the cemented surface of the tenth lens 10 and the eleventh lens 11, and "24" is the cemented surface of the thirteenth lens 13 and the fourteenth lens 14. The radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface. The units of the radius of curvature and the thickness are both millimeters (mm); the material (nd) is the refractive index, representing the ability of the material between the current surface and the next surface to deflect light. A space represents that the current position is air and the refractive index is 1; the material (vd) is the dispersion coefficient, representing the dispersion characteristics of the material between the current surface and the next surface to light. A space represents that the current position is air; the K value represents the numerical value of the best-fit conic coefficient of the aspherical surface; STO represents the aperture stop.

[0130] Table 6 shows a design value of the variable pitch in Table 5:

[0131] Design Values of Variable Pitch of the Zoom Lens at the Wide-Angle End and the Telephoto End in Table 6

[0132] Wide-angle end Telephoto end Variable spacing 1 0.855 11.37 Variable spacing 2 11.79 1.28 Variable spacing 3 6.94 1.29 Variable spacing 4 0.86 5.04

[0133] The aspherical surface shape equation z satisfies:

[0134]

[0135] Among them, Z represents the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of y along the optical axis direction; c = 1 / R, where R represents the paraxial radius of curvature of the mirror surface; k is the conic coefficient; A, B, C, D, and E represent the high-order aspherical coefficients.

[0136] Table 7 shows the aspherical coefficients of each lens in the zoom lens provided in the second embodiment of the present invention:

[0137] Design values of aspheric coefficients of each lens in the zoom lens in Table 7

[0138] Surface number A B C D E F 5 -2.091E-5 8.054E-7 -1.561E-8 1.393E-10 7.63E-14 0 6 8.507E-5 -6.866E-7 -3.062E-9 1.009E-10 2.433E-14 0 10 -1.000E-4 -1.652E-7 -7.058E-9 1.235E-10 -2.100E-12 4.796E-15 11 -1.118E-5 6.61E-7 4.532E-10 7.952E-11 6.468E-14 3.158E-15 21 7.817E-5 -1.989E-6 5.680E-8 -4.232E-10 -2.213E-13 -5.223E-15 22 9.168E-6 -6.555E-7 5.015E-8 -4.352E-10 -4.505E-13 -3.953E-15

[0139] Among them, -2.091E-5 means that the coefficient A of surface number 5 is -2.091 * 10 -5 , and so on.

[0140] The zoom lens provided in the second embodiment of the present invention reaches the following technical indicators:

[0141] Table 8 Technical indicators of the zoom lens

[0142] Wide-angle end Telephoto end Aperture 1.05 1.2 Focal length 4.65 10.16 Field of view angle 135° 53°

[0143] Figure 13 is the spherical aberration curve diagram of the zoom lens provided in the second embodiment of the present invention at the wide-angle end. As Figure 13 shown, the spherical aberration of the zoom lens at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) is within 0.036mm, and the curves at different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Thus, it can be seen that the zoom lens provided in the embodiment of the present invention can correct aberration well at the wide-angle end.

[0144] Figure 14 is the ray fan diagram of the zoom lens provided in the second embodiment of the present invention at the wide-angle end. As Figure 14 shown, the imaging ranges of light rays at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at different field angles of the zoom lens are all within 20μm and the curves are very concentrated, ensuring that the aberration in different field regions is small, that is, it shows that the zoom lens corrects the aberration of the optical system well at the wide-angle end.

[0145] Figure 15 is the spot diagram of the zoom lens provided in the second embodiment of the present invention at the wide-angle end. Among them, the spot diagram is one of the most commonly used evaluation methods in modern optical design. The spot diagram refers to a dispersion pattern formed by many light rays emitted from a point light source after passing through an optical system. Due to aberration, the intersection points of these light rays with the image plane are no longer concentrated at the same point but are scattered within a certain range. As Figure 15As shown, in the zoom lens provided by the embodiment of the present invention, the diffusion patterns of light of different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm and 0.850μm) in each field of view are relatively concentrated and evenly distributed. There is no phenomenon in which the diffusion pattern in a certain field of view is widely separated up and down with the wavelength, indicating that there is no obvious purple fringing. At the same time, the root mean square radius values (RMS radius) of light of different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm and 0.850μm) at each field of view of the zoom lens are 1.494μm, 2.590μm, 1.948μm, 1.621μm, 1.950μm and 2.192μm, respectively, indicating that the RMS radius of each field of view is less than 3μm, which means that the zoom lens has lower chromatic aberration and aberration at the wide-angle end, solves the purple fringing problem of imaging in each band, and can achieve high-resolution imaging.

[0146] Figure 16 This is a diagram of field curvature distortion of the zoom lens provided in the second embodiment of the present invention at the wide-angle end, as shown in FIG. Figure 16 As shown in the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, in mm; the vertical coordinate represents the normalized image height, without unit; T represents meridian, S represents arc loss; Figure 6 It can be seen that the zoom lens provided in this embodiment effectively controls the field curvature from light with a wavelength of 435nm to light with a wavelength of 850nm. That is, when imaging, the difference in image quality between the center and the periphery is small. In the coordinate system on the right, the horizontal coordinate represents the degree of distortion in %, and the vertical coordinate represents the normalized image height in no unit. Figure 6 It can be seen that the distortion of the zoom lens provided in this embodiment at the wide-angle end is well corrected, the imaging distortion is small, and the requirement of low distortion is met.

[0147] Figure 17 This is a spherical aberration curve diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end, as shown in FIG. Figure 17 As shown, the spherical aberration of the zoom lens at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm and 0.850μm) is within 0.036mm. The curves at different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Therefore, it can be seen that the zoom lens provided by the embodiment of the present invention can well correct aberrations at the telephoto end.

[0148] Figure 18 This is a ray fan diagram of the zoom lens at the telephoto end provided by the second embodiment of the present invention, as shown in FIG. Figure 18As shown in the figure, the imaging range of light of different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm and 0.850μm) at different field angles of the zoom lens is all within 20μm, and the curves are very concentrated, ensuring that the aberrations in different field areas are small, which also shows that the zoom lens has better corrected the aberrations of the optical system at the telephoto end.

[0149] Figure 19 This is a point diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end, as shown in FIG. Figure 19 As shown, in the zoom lens provided by the embodiment of the present invention, the diffusion patterns of light of different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm and 0.850μm) in each field of view are relatively concentrated and evenly distributed. There is no phenomenon in which the diffusion pattern in a certain field of view is widely separated up and down with the wavelength, indicating that there is no obvious purple fringing. At the same time, the root mean square radius values (RMS radius) of light of different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm and 0.850μm) at each field of view of the zoom lens are 1.798μm, 1.871μm, 2.229μm, 2.457μm, 2.565μm and 3.414μm, respectively, indicating that the RMS radius of each field of view is less than 4μm, which means that the zoom lens has lower chromatic aberration and aberration at the telephoto end, solves the purple fringing problem of imaging in each band, and can achieve high-resolution imaging.

[0150] Figure This is a field curvature distortion diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end, as shown in FIG. ​ As shown in the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, in mm; the vertical coordinate represents the normalized image height, without unit; T represents meridian, S represents arc loss; ​ It can be seen that the zoom lens provided in this embodiment effectively controls the field curvature from light with a wavelength of 435nm to light with a wavelength of 850nm. That is, when imaging, the difference in image quality between the center and the periphery is small. In the coordinate system on the right, the horizontal coordinate represents the degree of distortion in %, and the vertical coordinate represents the normalized image height in no unit. ​ It can be seen that the distortion of the zoom lens provided in this embodiment at the telephoto end is well corrected, the imaging distortion is small, and the requirement of low distortion is met.

[0151] Embodiment 3

[0152] ​ This is a schematic diagram of the structure of the zoom lens at the wide-angle end provided by the third embodiment of the present invention. ​Schematic diagram of the structure of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end. Refer to ​ and ​ , the zoom lens provided in Embodiment 3 of the present invention includes a fixed lens group 100 with positive optical power, a first varifocal lens group 200 with negative optical power, a second varifocal lens group 300 with positive optical power, and a compensation lens group 400 with positive optical power, which are arranged in sequence along the optical axis from the object side to the image side. The first varifocal lens group 200 and the second varifocal lens group 300 can reciprocate along the optical axis; the fixed lens group 100 includes a first lens 1, the first varifocal lens group 200 includes a second lens 2, a third lens 3, and a fourth lens 4 arranged in sequence along the optical axis from the object side to the image side, the second varifocal lens group 300 includes a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, and an eleventh lens 11 arranged in sequence along the optical axis from the object side to the image side, and the compensation lens group 400 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 arranged in sequence along the optical axis from the object side to the image side. The first lens 1 has positive optical power, the second lens 2 has negative optical power, the third lens 3 has negative optical power, the fourth lens 4 has positive optical power, the fifth lens 5 has positive optical power, the sixth lens 6 has negative optical power, the seventh lens 7 has negative optical power, the eighth lens 8 has positive optical power, the ninth lens 9 has negative optical power, the tenth lens 10 has positive optical power, the eleventh lens 11 has negative optical power, the twelfth lens 12 has positive optical power, the thirteenth lens 13 has positive optical power, and the fourteenth lens 14 has negative optical power. Among them, the seventh lens 7 and the eighth lens 8 form a doublet lens, the ninth lens 9, the tenth lens 10, and the eleventh lens 11 form a triplet lens, and the thirteenth lens 13 and the fourteenth lens 14 form a doublet lens. The aperture stop 500 is located in the optical path between the first varifocal lens group 200 and the second varifocal lens group 300.

[0153] Exemplarily, Table 9 details the specific optical physical parameters of each lens in the zoom lens provided in Embodiment 3 of the present invention in a feasible implementation manner. The zoom lens in Table 9 corresponds to ​ and ​ the zoom lens shown.

[0154] Table 9 Optical Physical Parameters of the First Lens to the Fourteenth Lens

[0155] ​ ​ ​ ​ ​ ​ ​ 1 ​ 36.737 2.586 1.86 27.2 2 ​ 52.021 ​ 3 ​ 55.471 0.95 1.73 56 4 ​ 9.861 7.453 5 ​ -19.547 0.576 1.59 72.7 2.379 6 ​ 22.331 0.156 -14.219 7 ​ 22.513 4.679 1.95 20.4 8 ​ 187.703 ​ ​ ​ ​ ​ 10 ​ 60.786 2.234 1.61 61.9 44.945 11 ​ -30.147 1.651 -8.778 12 ​ -12.306 1.87 1.6 44 13 ​ -17.454 0.098 14 ​ 35.273 0.701 1.66 40 15 ​ 16.263 6.689 1.59 65.6 16 ​ -16.535 0.086 17 ​ 28.876 0.985 1.85 26 18 ​ 10.559 6.102 1.59 60.1 19 ​ -15.316 0.5 2 25.9 20 ​ -28.063 ​ 21 ​ 35.61 1.5 1.84 36.7 -38.897 22 ​ 152.019 0.046 0.455 23 ​ 22.528 3.519 1.99 17.4 24 ​ -15.152 0.75 1.85 22.9 25 ​ 11.643

[0156] The surface numbers in Table 9 are numbered according to the surface order of each lens. For example, "1" represents the object surface of the first lens 1, "2" represents the image surface of the first lens 1, and so on. Among them, "15" is the cemented surface of the seventh lens 7 and the eighth lens 8, "18" is the cemented surface of the ninth lens 9 and the tenth lens 10, "19" is the cemented surface of the tenth lens 10 and the eleventh lens 11, and "24" is the cemented surface of the thirteenth lens 13 and the fourteenth lens 14. The radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface. The units of both the radius of curvature and the thickness are millimeters (mm); the material (nd) is the refractive index, representing the ability of the material between the current surface and the next surface to deflect light. A space represents that the current position is air and the refractive index is 1; the material (vd) is the dispersion coefficient, representing the dispersion characteristics of the material between the current surface and the next surface to light. A space represents that the current position is air; the K value represents the numerical value of the best-fit conic coefficient of the aspheric surface; STO represents the aperture stop.

[0157] Table 10 shows a design value of the variable spacing in Table 9:

[0158] Table 10 Design values of the variable spacing of the zoom lens at the wide-angle end and the telephoto end

[0159] ​ ​ ​ 0.5 11.45 ​ 11.79 0.83 ​ 7 1.47 ​ 0.77 4.95

[0160] The aspheric surface shape equation z satisfies:

[0161]

[0162] Among them, Z represents the distance sagitta from the vertex of the aspheric surface when the aspheric surface is at a position with a height of y along the optical axis direction; c = 1 / R, where R represents the paraxial radius of curvature of the mirror surface; k is the conic coefficient; A, B, C, D, E, F represent the high-order aspheric coefficients.

[0163] Table 11 shows the aspheric coefficients of each lens in the zoom lens provided in Embodiment 3 of the present invention:

[0164] Table 11 Design values of the aspheric coefficients of each lens in the zoom lens

[0165] ​ A B C D E F 5 -2.035E-5 8.625E-7 -1.608E-8 1.493E-10 1.102E-13 0 6 8.332E-5 -7.115E-7 -3.879E-9 1.118E-10 5.484E-14 0 10 -1.024E-4 -1.859E-7 -6.990E-9 1.235E-10 -1.965E-12 7.521E-15 11 -1.048E-5 6.374E-7 3.106E-10 7.767E-11 5.367E-14 4.681E-15 21 7.966E-5 -1.993E-6 5.688E-8 -4.139E-10 -1.456E-13 -7.53E-16 22 9.000E-6 -6.529E-7 4.998E-8 -4.389E-10 -2.623E-13 -1.231E-15

[0166] Among them, -2.035E-5 means that the coefficient A of the surface number 5 is -2.035×10 -5 , and so on.

[0167] The zoom lens provided in Embodiment 3 of the present invention reaches the following technical indicators:

[0168] Table 12 Technical Specifications of the Zoom Lens

[0169] ​ ​ ​ 1.07 1.19 ​ 4.65 10.14 ​ 135° 52°

[0170] ​ The spherical aberration curve of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end is shown as ​ shown. The spherical aberration of the zoom lens at different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) is within 0.027mm. The curves at different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Thus, it can be known that the zoom lens provided in the embodiment of the present invention can correct aberration well at the wide-angle end.

[0171] ​ The ray fan diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end is shown as ​ shown. The imaging ranges of rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at different field angles of the zoom lens are all within 20μm and the curves are very concentrated, ensuring that the aberration in different field regions is small, that is, it shows that the zoom lens corrects the aberration of the optical system well at the wide-angle end.

[0172] ​ The spot diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end. Among them, the spot diagram is one of the most commonly used evaluation methods in modern optical design. The spot diagram refers to a dispersion pattern formed by many rays emitted from a point light source after passing through an optical system. Due to aberration, the intersection points of these rays with the image plane are no longer concentrated at the same point but are scattered within a certain range. As ​ shown, for the zoom lens provided in the embodiment of the present invention, the dispersion patterns of rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at each field are relatively concentrated and evenly distributed. There is no phenomenon that the dispersion pattern at a certain field is separated vertically with the wavelength significantly. This indicates no obvious purple fringing. At the same time, the root mean square radius values (RMS radii) of rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at each field position of the zoom lens are 1.070μm, 2.751μm, 1.553μm, 2.370μm, 2.902μm, and 3.026μm respectively, indicating that the RMS radii of each field are all less than 4μm. That is to say, the zoom lens has low chromatic aberration and aberration at the wide-angle end, solves the purple fringing problem of imaging in each band, and can achieve high-resolution imaging.

[0173] ​ This is the field curvature and distortion diagram of the zoom lens provided in the third embodiment of the present invention at the wide-angle end. As ​ shown, in the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without a unit; where T represents meridian and S represents sagittal; from ​ it can be seen that for the zoom lens provided in this embodiment, from the light with a wavelength of 435 nm to the light with a wavelength of 850 nm, the field curvature is effectively controlled, that is, when imaging, the image quality difference between the center and the periphery is small; in the right coordinate system, the horizontal coordinate represents the magnitude of distortion, with the unit of %; the vertical coordinate represents the normalized image height, without a unit; from ​ it can be seen that the distortion of the zoom lens provided in this embodiment at the wide-angle end is well corrected, and the imaging distortion is small, meeting the requirement of low distortion.

[0174] ​ This is the spherical aberration curve diagram of the zoom lens provided in the third embodiment of the present invention at the telephoto end. As ​ shown, the spherical aberration of the zoom lens at different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) is within 0.035 mm, and the curves at different wavelengths are relatively concentrated, indicating that the axial aberration of the zoom lens is small. Thus, it can be known that the zoom lens provided in the third embodiment of the present invention can well correct the aberration at the telephoto end.

[0175] ​ This is the ray fan diagram of the zoom lens provided in the third embodiment of the present invention at the telephoto end. As ​ shown, the imaging ranges of light rays with different wavelengths (0.435 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm, and 0.850 μm) at different field angles of the zoom lens are all within 20 μm and the curves are very concentrated, ensuring that the aberration in different field regions is small, that is, it shows that the zoom lens well corrects the aberration of the optical system at the telephoto end.

[0176] ​ This is the spot diagram of the zoom lens provided in the third embodiment of the present invention at the telephoto end. As ​As shown, for the zoom lens provided by the embodiment of the present invention, the dispersion patterns of light rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) are relatively concentrated and evenly distributed in each field of view, and there is no phenomenon that the dispersion pattern in a certain field of view separates significantly up and down with the wavelength, indicating no obvious purple fringing. At the same time, the root mean square radius values (RMS radii) of light rays with different wavelengths (0.435μm, 0.486μm, 0.546μm, 0.588μm, 0.656μm, and 0.850μm) at each field of view position of the zoom lens are 1.455μm, 1.572μm, 2.004μm, 2.245μm, 2.396μm, and 3.349μm respectively, indicating that the RMS radius of each field of view is less than 4μm, which also means that the zoom lens has low chromatic aberration and spherical aberration at the telephoto end, solves the purple fringing problem of imaging in each band, and can achieve high-resolution imaging.

[0177] ​ The field curvature distortion diagram of the zoom lens provided by the third embodiment of the present invention at the telephoto end is as ​ shown. In the left coordinate system, the horizontal coordinate represents the magnitude of field curvature, with the unit of mm; the vertical coordinate represents the normalized image height, without a unit; where T represents meridian and S represents sagittal; from ​ it can be seen that for the zoom lens provided by this embodiment, from the light with a wavelength of 435nm to the light with a wavelength of 850nm, the field curvature is effectively controlled, that is, when imaging, the image quality at the center and the image quality at the periphery have a small difference; in the right coordinate system, the horizontal coordinate represents the magnitude of distortion, with the unit of %; the vertical coordinate represents the normalized image height, without a unit; from ​ it can be seen that the distortion of the zoom lens provided by this embodiment at the telephoto end is well corrected, the imaging distortion is small, and it meets the requirement of low distortion.

[0178] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and various obvious changes, re-adjustments, mutual combinations, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A zoom lens, characterized in that, It includes a fixed lens group with positive optical power, a first variable magnification lens group with negative optical power, a second variable magnification lens group with positive optical power, and a compensating lens group with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis. The first variable magnification lens group and the second variable magnification lens group can reciprocate along the optical axis; The fixed lens group includes a first lens. The first variable magnification lens group includes a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side along the optical axis. The second variable magnification lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens arranged in sequence from the object side to the image side along the optical axis. The compensating lens group includes a twelfth lens, a thirteenth lens, and a fourteenth lens arranged in sequence from the object side to the image side along the optical axis; The first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, the fourth lens has positive optical power, the fifth lens has positive optical power, the sixth lens has negative optical power, the seventh lens has negative optical power, the eighth lens has positive optical power, the ninth lens has negative optical power, the tenth lens has positive optical power, the eleventh lens has negative optical power, the twelfth lens has positive optical power, the thirteenth lens has positive optical power, and the fourteenth lens has negative optical power; The optical power of the second lens is φ2, the optical power of the third lens is φ3, the optical power of the fourth lens is φ4, the optical power of the fifth lens is φ5, the optical power of the sixth lens is φ6, the optical power of the seventh lens is φ7, the optical power of the eighth lens is φ8, the optical power of the ninth lens is φ9, the optical power of the tenth lens is φ10, the optical power of the eleventh lens is φ11, the optical power of the twelfth lens is φ12, the optical power of the thirteenth lens is φ13, the optical power of the fourteenth lens is φ14. The optical power of the first variable magnification lens group is Z1, the optical power of the second variable magnification lens group is Z2, and the optical power of the compensating lens group is B; Wherein, the optical powers of the second lens to the fourteenth lens satisfy the following conditions: 0.3 ≤ |φ2 / Z1| ≤ 2.1; 0.3 ≤ |φ3 / Z1| ≤ 2.0, 0.15 ≤ |φ4 / Z1| ≤ 1.5; 0.15 ≤ |φ5 / Z2| ≤ 1.5; 0.05 ≤ |φ6 / Z2| ≤ 0.8; 0.08 ≤ |φ7 / Z2| ≤ 1; 0.35 ≤ |φ8 / Z2| ≤ 2.5; 0.25 ≤ |φ9 / Z2| ≤ 2.2; 0.4 ≤ |φ10 / Z2| ≤ 3.9; 0.05 ≤ |φ11 / Z2| ≤ 0.85; 0.8 ≤ |φ12 / B| ≤ 5.5; 3.5 ≤ |φ13 / B| ≤ 55; 4 ≤ |φ14 / B| ≤ 45.

2. The zoom lens according to claim 1, wherein The optical power G of the fixed lens group and the optical power B of the compensating lens group satisfy: 0.2 ≤ |G / B| ≤ 2.5; The optical power Z1 of the first variable magnification lens group and the optical power B of the compensation lens group satisfy: 3 ≤ |Z1 / B| ≤ 30; The optical power Z2 of the second variable magnification lens group and the optical power B of the compensation lens group satisfy: 2 ≤ |Z2 / B| ≤ 25.

3. The zoom lens according to claim 1, characterized in that, The refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, the refractive index of the seventh lens is n7, the refractive index of the eighth lens is n8, the refractive index of the ninth lens is n9, the refractive index of the tenth lens is n10, the refractive index of the eleventh lens is n11, the refractive index of the twelfth lens is n12, the refractive index of the thirteenth lens is n13, and the refractive index of the fourteenth lens is n14; Among them, the refractive indices of the first lens to the fourteenth lens satisfy the following conditions: 1.6 ≤ n1 ≤ 2.15; 1.58 ≤ n2 ≤ 1.95; 1.43 ≤ n3 ≤ 1.75; 1.71 ≤ n4 ≤ 2.15; 1.4 ≤ n5 ≤ 1.75; 1.55 ≤ n6 ≤ 1.95; 1.55 ≤ n7 ≤ 1.95; 1.4 ≤ n8 ≤ 1.75; 1.65 ≤ n9 ≤ 2.15; 1.4 ≤ n10 ≤ 1.75; 1.7 ≤ n11 ≤ 2.15; 1.65 ≤ n12 ≤ 2.15; 1.7 ≤ n13 ≤ 2.15; 1.65 ≤ n14 ≤ 2.

1.

4. The zoom lens according to claim 1, characterized in that, The seventh lens and the eighth lens form a doublet lens, the ninth lens, the tenth lens and the eleventh lens form a triplet lens, and the thirteenth lens and the fourteenth lens form a doublet lens.

5. The zoom lens according to claim 1, characterized in that, The first lens, the second lens, the fourth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the thirteenth lens and the fourteenth lens are all spherical lenses, and the third lens, the fifth lens and the twelfth lens are all aspherical lenses.

6. The zoom lens according to claim 1, characterized in that, The aperture of the zoom lens satisfies: 0.9 ≤ Fw~Ft ≤ 1.4; Among them, Fw represents the aperture of the zoom lens at the wide-angle end, and Ft represents the aperture of the zoom lens at the telephoto end.

7. The zoom lens according to claim 1, characterized in that, The field of view angle of the zoom lens satisfies: 90° ≤ FOV-w; FOV-t ≤ 65°; Among them, FOV-w represents the field of view angle of the zoom lens at the wide-angle end, and FOV-t represents the field of view angle of the zoom lens at the telephoto end.

8. The zoom lens according to claim 1, characterized in that, The image plane diameter IC of the zoom lens and the total lens length TTL of the zoom lens satisfy: 0.02 ≤ IC / TTL ≤ 1.2.

Images