Zoom lens

Abstract

The present invention discloses a zoom lens, which includes a focusing lens group, a fixed lens group, and a varifocal lens group arranged in sequence along the optical axis from the object plane to the image plane. The focusing lens group includes a first lens with negative optical power, a second lens with negative optical power, and a third lens with positive optical power. The fixed lens group includes a fourth lens with positive optical power. The varifocal lens group includes a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, a ninth lens with positive optical power, and a tenth lens with negative optical power. The zoom lens provided by the present invention can ensure clear images in different focal length states, and has the advantages of small volume, ultra-wide angle, and large aperture, and can meet the requirements of security monitoring.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of optical devices, and particularly to a zoom lens. Background Art

[0002] Zoom lenses are becoming increasingly popular in the security monitoring market because their variable focal lengths can be applied to a variety of monitoring scenarios. Zoom lenses can be divided into constant aperture and non-constant aperture according to the aperture type; and can be divided into wide-angle zoom and telephoto zoom according to the angle.

[0003] In recent years, the concept of super-large aperture starlight has been gradually recognized in the security field. In the era of networking and digitization, the pursuit of high definition in monitoring has led to higher requirements 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.

[0004] However, the maximum angle of existing constant aperture zoom lenses is usually less than 76°, and the monitoring range is not wide enough; for ultra-wide angle zoom lenses with a maximum angle above 130°, the aperture differences at different focal lengths are relatively large, resulting in obvious differences in the picture brightness at different focal lengths; large aperture wide-angle zoom lenses are relatively large in volume, and the length is usually greater than 65 mm, which limits the scope of use of the lens. Therefore, it is necessary to develop a wide-angle zoom lens with a small volume, a large aperture, and a constant aperture. Summary of the Invention

[0005] The present invention provides a zoom lens to achieve a wide-angle zoom lens with a small volume, a large aperture, and a constant aperture.

[0006] The embodiments of the present invention provide a zoom lens, which includes a focusing lens group, a fixed lens group, and a zoom lens group arranged in sequence from the object plane to the image plane along the optical axis; the fixed lens group is fixedly arranged, and the focusing lens group and the zoom lens group are movably arranged along the optical axis direction;

[0007] The focusing lens group has a negative optical power, the fixed lens group has a positive optical power, and the zoom lens group has a positive optical power;

[0008] The focusing lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object plane to the image plane along the optical axis;

[0009] The fixed lens group includes a fourth lens;

[0010] The zoom lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the object plane to the image plane along the optical axis;

[0011] The first lens has a negative optical power, the second lens has a negative optical power, the third lens has a positive optical power; the fourth lens has a positive optical power; the fifth lens has a positive optical power, the sixth lens has a positive optical power, the seventh lens has a negative optical power, the eighth lens has a positive optical power, the ninth lens has a positive optical power, and the tenth lens has a negative optical power.

[0012] Optionally, the sixth lens, the seventh lens, and the eighth lens form a triple cemented lens group.

[0013] Optionally, the first lens, the sixth lens, the seventh lens, and the eighth lens are glass spherical lenses;

[0014] The second lens, the third lens, the fourth lens, the fifth lens, the ninth lens, and the tenth lens are aspherical lenses.

[0015] Optionally, the optical power of the varifocal lens group is Z1, the optical power of the fixed lens group is G1, and the optical power of the focusing lens group is B1, where:

[0016] 0.8 ≤ |Z1 / B1| ≤ 1.3; 10 ≤ |Z1 / G1| ≤ 30; 10 ≤ |B1 / G1| ≤ 30.

[0017] Optionally, the optical power of the first lens is φ1, the optical power of the second lens is φ2, the optical power of the third lens is φ3, 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 varifocal lens group is Z1, and the optical power of the focusing lens group is B1, where:

[0018] 0.6 ≤ |φ1 / B1| ≤ 1; 0.3 ≤ |φ2 / B1| ≤ 0.7; 0.1 ≤ |φ3 / B1| ≤ 0.6;

[0019] 0.5 ≤ |φ5 / Z1| ≤ 1.2; 0.25 ≤ |φ6 / Z1| ≤ 0.85; 0.7 ≤ |φ7 / Z1| ≤ 2;

[0020] 0.4 ≤ |φ8 / Z1| ≤ 1.3; 0.06 ≤ |φ9 / Z1| ≤ 0.4; 0.08 ≤ |φ10 / Z1| ≤ 0.55.

[0021] 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, where:

[0022] 1.5 ≤ n1 ≤ 1.9; 1.45 ≤ n2 ≤ 1.85; 1.55 ≤ n3 ≤ 2.1; 1.5 ≤ n4 ≤ 1.85;

[0023] 1.4 ≤ n5 ≤ 1.75; 1.4 ≤ n6 ≤ 1.75; 1.55 ≤ n7 ≤ 1.95; 1.4 ≤ n8 ≤ 1.7;

[0024] 1.5 ≤ n9 ≤ 1.85; 1.4 ≤ n10 ≤ 1.75.

[0025] Optionally, the aperture of the zoom lens at the wide-angle end is Fw, and the aperture of the zoom lens at the telephoto end is Ft, where 0.9 ≤ Fw ~ Ft ≤ 1.6.

[0026] Optionally, the field of view angle of the zoom lens at the wide-angle end is FOV-w, and the field of view angle of the zoom lens at the telephoto end is FOV-t, where:

[0027] FOV-w ≥ 90°; FOV-t ≤ 70°.

[0028] Optionally, the image plane diameter IC of the zoom lens and the overall optical length TTL of the zoom lens satisfy 0.05 ≤ IC / TTL ≤ 0.25.

[0029] Optionally, the zoom lens further includes a diaphragm;

[0030] The diaphragm is located in the optical path between the third lens and the fourth lens.

[0031] The embodiment of the present invention provides a three-component ultra-wide-angle large-aperture zoom lens, which includes a focusing lens group, a fixed lens group, and a zoom lens group arranged in sequence from the object plane to the image plane along the optical axis, and specifically uses 10 lenses. The number of lenses is small, which helps to reduce the length of the lens. By reasonably matching the focusing lens group, the fixed lens group, the zoom lens group, and the optical powers of each lens therein, the aberration can be corrected well, ensuring the clarity of the image in different focal length states. At the same time, the zoom lens has the advantages of small volume, ultra-wide angle, and large aperture, meeting the requirements of security monitoring. Description of the Drawings

[0032] Figure 1Schematic diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end;

[0033] Figure 2 Schematic diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0034] Figure 3 Spherical aberration curve diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end;

[0035] Figure 4 Ray fan diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end;

[0036] Figure 5 Spot diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end;

[0037] Figure 6 Field curvature and distortion diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end;

[0038] Figure 7 Spherical aberration curve diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0039] Figure 8 Ray fan diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0040] Figure 9 Spot diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0041] Figure 10 Field curvature and distortion diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end;

[0042] Figure 11 Schematic diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0043] Figure 12 Schematic diagram of the zoom lens provided in Embodiment 2 of the present invention at the telephoto end;

[0044] Figure 13 Spherical aberration curve diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0045] Figure 14 Ray fan diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0046] Figure 15 Spot diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0047] Figure 16 Field curvature and distortion diagram of the zoom lens provided in Embodiment 2 of the present invention at the wide-angle end;

[0048] Figure 17 Spherical aberration curve of the zoom lens provided in the second embodiment of the present invention at the telephoto end;

[0049] Figure 18 Ray fan diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end;

[0050] Figure 19 Spot diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end;

[0051] Figure 20 Field curvature and distortion diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end;

[0052] Figure 21 Schematic structural diagram of the zoom lens provided in the third embodiment of the present invention at the wide-angle end;

[0053] Figure 22 Schematic structural diagram of the zoom lens provided in the third embodiment of the present invention at the telephoto end;

[0054] Figure 23 Spherical aberration curve of the zoom lens provided in the third embodiment of the present invention at the wide-angle end;

[0055] Figure 24 Ray fan diagram of the zoom lens provided in the third embodiment of the present invention at the wide-angle end;

[0056] Figure 25 Spot diagram of the zoom lens provided in the third embodiment of the present invention at the wide-angle end;

[0057] Figure 26 Field curvature and distortion diagram of the zoom lens provided in the third embodiment of the present invention at the wide-angle end;

[0058] Figure 27 Spherical aberration curve of the zoom lens provided in the third embodiment of the present invention at the telephoto end;

[0059] Figure 28 Ray fan diagram of the zoom lens provided in the third embodiment of the present invention at the telephoto end;

[0060] Figure 29 Spot diagram of the zoom lens provided in the third embodiment of the present invention at the telephoto end;

[0061] Figure 30 Field curvature and distortion diagram of the zoom lens provided in the third embodiment of the present invention at the telephoto end. Detailed implementation manners

[0062] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0063] Embodiment 1

[0064] Figure 1 FIG. is a schematic structural diagram of the zoom lens provided in Embodiment 1 of the present invention at the wide-angle end. Figure 2 FIG. is a schematic structural diagram of the zoom lens provided in Embodiment 1 of the present invention at the telephoto end. As Figure 1 and Figure 2 shown, the zoom lens provided in the embodiment of the present invention includes a focusing lens group 10, a fixed lens group 11, and a varifocal lens group 12 arranged in sequence along the optical axis from the object plane to the image plane. The fixed lens group 11 is fixedly arranged, the focusing lens group 10 and the varifocal lens group 12 are arranged to move along the optical axis direction. The focusing lens group 10 has a negative optical power, the fixed lens group 11 has a positive optical power, and the varifocal lens group 12 has a positive optical power. The focusing lens group 10 includes a first lens 110, a second lens 120, and a third lens 130 arranged in sequence along the optical axis from the object plane to the image plane. The fixed lens group 11 includes a fourth lens 140. The varifocal lens group 12 includes a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, a ninth lens 190, and a tenth lens 200 arranged in sequence along the optical axis from the object plane to the image plane. The first lens 110 has a negative optical power, the second lens 120 has a negative optical power, the third lens 130 has a positive optical power, the fourth lens 140 has a positive optical power, the fifth lens 150 has a positive optical power, the sixth lens 160 has a positive optical power, the seventh lens 170 has a negative optical power, the eighth lens 180 has a positive optical power, the ninth lens 190 has a positive optical power, and the tenth lens 200 has a negative optical power.

[0065] Among them, in the zoom lens provided in this embodiment, the focusing lens group 10, the fixed lens group 11, and the varifocal lens group 12 can be arranged in a lens barrel ( Figure 1 not shown in the figure). The fixed lens group 11 is fixed in position in the lens barrel. The focusing lens group 10 and the varifocal lens group 12 can reciprocate along the optical axis in the lens barrel. Through the combined movement of the focusing lens group 10 and the varifocal lens group 12, the focal length of the zoom lens can be continuously changed 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.

[0066] It can be understood that during the zooming process of the zoom lens by moving the focusing lens group 10 and the zoom lens group 12, 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.

[0067] Furthermore, the optical power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, which characterizes the ability of the optical system to deflect light rays. The larger the absolute value of the optical power, the stronger the bending ability of the light rays, and the smaller the absolute value of the optical power, the weaker the bending ability of the light rays. When the optical power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light rays is divergent. The optical power can be applied to characterize a certain refracting surface of a lens (i.e., a surface of the lens), can be applied to characterize a certain lens, or can be applied to characterize a system formed by multiple lenses together (i.e., a lens group).

[0068] In this embodiment, by setting the focusing lens group 10 to have a negative optical power, the fixed lens group 11 to have a positive optical power, and the zoom lens group 12 to have a positive optical power, the optical powers of the focusing lens group 10, the fixed lens group 11, and the zoom lens group 12 cooperate with each other, which can compensate for the aberration caused during the zooming movement of the focusing lens group 10 and the zoom lens group 12, and ensure the clarity of the image in different focal length states.

[0069] Furthermore, as Figure 1 and Figure 2 shown, the focusing lens group 10 includes a first lens 110 with a negative optical power, a second lens 120 with a negative optical power, and a third lens 130 with a positive optical power arranged in sequence along the optical axis from the object surface to the image surface; the fixed lens group 11 includes a fourth lens 140 with a positive optical power; the zoom lens group 12 includes a fifth lens 150 with a positive optical power, a sixth lens 160 with a positive optical power, a seventh lens 170 with a negative optical power, an eighth lens 180 with a positive optical power, a ninth lens 190 with a positive optical power, and a tenth lens 200 with a negative optical power arranged in sequence along the optical axis from the object surface to the image surface. Among them, the zoom lens provided by the embodiment of the present invention only uses 10 lenses, and the number of lenses is small, which helps to reduce the length of the lens, so that the lens length can be less than 52 mm. At the same time, by reasonably matching the optical powers of the 10 lenses, the aberration can be corrected well, and a zoom lens with an ultra-wide-angle constant large aperture (F1.0 - F1.2) and infrared confocal in the entire focal range can be realized. Its maximum angle at the wide-angle end is more than 135°, and it can be applied to a 1 / 1.8〞 large target surface photosensitive chip, so as to meet the wide-range security monitoring requirements.

[0070] In summary, the embodiments of the present invention provide a three-component ultra-wide-angle large-aperture zoom lens, which includes a focusing lens group 10, a fixed lens group 11, and a variable magnification lens group 12 arranged in sequence along the optical axis from the object plane to the image plane, and specifically uses 10 lenses. The number of lenses is small, which helps to reduce the length of the lens. By reasonably matching the focusing lens group 10, the fixed lens group 11, the variable magnification lens group 12, and the optical powers of the respective lenses therein, aberrations can be corrected well, ensuring the clarity of the image in different focal length states. At the same time, the zoom lens has the advantages of small volume, ultra-wide angle, and large aperture, meeting the requirements of security monitoring.

[0071] As a feasible implementation manner, as Figure 1 and Figure 2 shown, the sixth lens 160, the seventh lens 170, and the eighth lens 180 form a triple cemented lens group.

[0072] Among them, by setting the sixth lens 160, the seventh lens 170, and the eighth lens 180 to form a triple cemented lens group, the air gap between the sixth lens 160, the seventh lens 170, and the eighth lens 180 can be effectively reduced, thereby further reducing the total length of the lens. In addition, the triple cemented lens group can minimize or eliminate chromatic aberration to the greatest extent, 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 optical performances such as distortion can be optimized. Moreover, 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 triple cemented lens group can also reduce the assembly components between the three 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.

[0073] As a feasible implementation manner, the first lens 110, the sixth lens 160, the seventh lens 170, and the eighth lens 180 are glass spherical lenses, and the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the ninth lens 190, and the tenth lens 200 are aspherical lenses.

[0074] In this embodiment, by setting the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the ninth lens 190, and the tenth lens 200 as aspherical lenses, off-axis aberrations can be corrected, including field curvature, coma, astigmatism, etc.

[0075] Among them, the materials of the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the ninth lens 190, and the tenth lens 200 can be set according to actual needs.

[0076] Exemplarily, the fifth lens 150 is a glass aspherical lens to better correct chromatic aberration and spherical aberration and improve image quality.

[0077] Further, the second lens 120, the third lens 130, the fourth lens 140, the ninth lens 190, and the tenth lens 200 can be plastic aspherical lenses, but are not limited thereto. Since the cost of lenses made of plastic material is much lower than that of lenses made of glass material, the cost of the zoom lens can be reduced. At the same time, these two types of materials, glass and plastic, can play a complementary role, can balance high and low temperatures and reduce the total length of the lens, so that the zoom lens has the characteristic of stable performance at high and low temperatures, improving the environmental adaptability of the zoom lens and meeting the use conditions of -40°C to 80°C.

[0078] Among them, the material of the plastic aspherical lens can be various plastics known to those skilled in the art, and the materials of the glass spherical lens and the glass aspherical lens are various types of glass known to those skilled in the art. The embodiments of the present invention will not elaborate or limit this.

[0079] As a feasible implementation manner, the optical power of the zoom lens group 12 is Z1, the optical power of the fixed lens group 11 is G1, and the optical power of the focusing lens group 10 is B1, where 0.8 ≤ |Z1 / B1| ≤ 1.3, 10 ≤ |Z1 / G1| ≤ 30, and 10 ≤ |B1 / G1| ≤ 30.

[0080] Among them, by setting the optical power Z1 of the zoom lens group 12, the optical power G1 of the fixed lens group 11, and the optical power B1 of the focusing lens group 10 to satisfy 0.8 ≤ |Z1 / B1| ≤ 1.3, 10 ≤ |Z1 / G1| ≤ 30, and 10 ≤ |B1 / G1| ≤ 30, the optical powers of the focusing lens group 10, the fixed lens group 11, and the zoom lens group 12 are reasonably allocated to cooperate with each other, which can better correct spherical aberration and realize a zoom lens with an ultra-wide-angle constant large aperture (F1.0 to F1.2). Its wide-angle end has a maximum angle of more than 135°, and it can be applicable to a 1 / 1.8〞 large target surface photosensitive chip, thus meeting the wide-range security monitoring requirements.

[0081] As a feasible implementation, the optical power of the first lens 110 is φ1, the optical power of the second lens 120 is φ2, the optical power of the third lens 130 is φ3, the optical power of the fifth lens 15 is φ5, the optical power of the sixth lens 160 is φ6, the optical power of the seventh lens 170 is φ7, the optical power of the eighth lens 180 is φ8, the optical power of the ninth lens 190 is φ9, the optical power of the tenth lens 200 is φ10, the optical power of the variable magnification lens group 12 is Z1, and the optical power of the focusing lens group 10 is B1, where 0.6 ≤ |φ1 / B1| ≤ 1; 0.3 ≤ |φ2 / B1| ≤ 0.7; 0.1 ≤ |φ3 / B1| ≤ 0.6; 0.5 ≤ |φ5 / Z1| ≤ 1.2; 0.25 ≤ |φ6 / Z1| ≤ 0.85; 0.7 ≤ |φ7 / Z1| ≤ 2; 0.4 ≤ |φ8 / Z1| ≤ 1.3; 0.06 ≤ |φ9 / Z1| ≤ 0.4; 0.08 ≤ |φ10 / Z1| ≤ 0.55.

[0082] Among them, by reasonably distributing the optical powers of the lenses, it is beneficial to better correct aberrations and ensure the clarity of the image in different focal length states.

[0083] As a feasible implementation, the refractive index of the first lens 110 is n1, the refractive index of the second lens 120 is n2, the refractive index of the third lens 130 is n3, the refractive index of the fourth lens 140 is n4, the refractive index of the fifth lens 150 is n5, the refractive index of the sixth lens 160 is n6, the refractive index of the seventh lens 170 is n7, the refractive index of the eighth lens 180 is n8, the refractive index of the ninth lens 190 is n9, and the refractive index of the tenth lens 200 is n10, where 1.5 ≤ n1 ≤ 1.9; 1.45 ≤ n2 ≤ 1.85; 1.55 ≤ n3 ≤ 2.1; 1.5 ≤ n4 ≤ 1.85; 1.4 ≤ n5 ≤ 1.75; 1.4 ≤ n6 ≤ 1.75; 1.55 ≤ n7 ≤ 1.95; 1.4 ≤ n8 ≤ 1.7; 1.5 ≤ n9 ≤ 1.85; 1.4 ≤ n10 ≤ 1.75.

[0084] Among them, the refractive index is the ratio of the propagation speed of light in a vacuum to the propagation 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.

[0085] In this embodiment, 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.

[0086] As a feasible implementation, the aperture of the zoom lens at the wide-angle end is Fw, and the aperture of the zoom lens at the telephoto end is Ft, where 0.9 ≤ Fw~Ft ≤ 1.6.

[0087] Among them, the zoom lens provided by the embodiments of the present invention is a zoom lens with a constant large aperture. The aperture Fw at the wide-angle end and the aperture Ft at the telephoto end of the zoom lens reach 0.9 to 1.6, meeting the requirements of a large throughput and the monitoring needs under low illuminance conditions.

[0088] As a feasible implementation manner, the field of view angle at the wide-angle end of the zoom lens is FOV-w, and the field of view angle at the telephoto end of the zoom lens is FOV-t, where FOV-w ≥ 90°; FOV-t ≤ 70°.

[0089] Among them, the zoom lens provided by the embodiments of the present invention is a zoom lens with a relatively large field of view angle, with a field of view angle of more than 90° at the wide-angle end, and further up to 135°. At the same time, the field of view angle FOV-t at the telephoto end satisfies FOV-t ≤ 70°, which can ensure the focal length requirements of the zoom lens at the telephoto end.

[0090] As a feasible implementation manner, the image plane diameter IC of the zoom lens and the total optical length TTL of the zoom lens satisfy 0.05 ≤ IC / TTL ≤ 0.25.

[0091] Among them, 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 110 to the image plane is the total optical length TTL. In this embodiment, by reasonably setting the relationship between the image plane diameter IC of the zoom lens and the total optical length TTL of the zoom lens, 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.

[0092] As a feasible implementation manner, as Figure 1 and Figure 2 shown, the zoom lens further includes a diaphragm 210, and the diaphragm 210 is located in the optical path between the third lens 130 and the fourth lens 140.

[0093] Among them, by adding the diaphragm 210, the propagation direction of the light beam can be adjusted, which is beneficial to improving the imaging quality. The diaphragm 210 can be located in the optical path between the third lens 130 and the fourth lens 140, but the specific setting position of the diaphragm 210 in the embodiments of the present invention is not limited.

[0094] To sum up, the zoom lens provided by the present invention uses a hybrid glass and plastic structure, and by reasonably distributing the optical power, provides a zoom lens with an ultra-wide angle, constant large aperture (F1.0 - F1.2), infrared confocal at the full focal length. 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, the lens length is less than 52 mm, and it can meet the use conditions of - ۴۰℃ - ۸۰℃, realizing a zoom lens with an ultra-wide angle, large aperture, large target surface, small volume and constant aperture.

[0095] Exemplarily, Table 1 details the specific optical physical parameters of each lens in the zoom lens provided in the first embodiment of the present invention in a feasible implementation manner. The zoom lens in Table 1 corresponds to Figure 1 and Figure 2 the zoom lens shown.

[0096] Table 1 Design values of the optical physical parameters of the zoom lens

[0097] Surface number Surface type Radius of curvature Thickness Material (nd) Material (vd) K coefficient 1 Spherical surface 104.9649 0.92 1.636 61 2 Spherical surface 8.790439 4.81 3 Aspherical surface 32.07441 1.2 1.534 60 -1.528595 4 Aspherical surface 9.302034 0.28 -5.964169 5 Aspherical surface 20.55711 2.17 1.649 25 -3.16166 6 Aspherical surface 161.1996 Variable spacing 1 -33.70122 7 Aspherical surface -14.86603 2.88 1.672 18.02 1.817146 8 Aspherical surface -14.37386 0.784 -1.675673 STO PL INF Variable spacing 2 10 Aspherical surface 12.01906 5.36 1.497 66.74 -1.692946 11 Aspherical surface -18.20524 0.13 -0.4718619 12 Spherical surface 12.7338 3.35 1.593 56.24 13 Spherical surface -304.445 0.92 1.718 25.05 14 Spherical surface 6.953158 5.04 1.437 82.42 15 Spherical surface -31.69463 0.68 16 Aspherical surface -15.84332 2.58 1.674 18.52 -39.5827 17 Aspherical surface -13.09543 0.14 -15.87008 18 Aspherical surface 6.985701 1.35 1.533 58 -1.563775 19 Aspherical surface 5.275889 -3.133711

[0098] Among them, the surface number is numbered according to the surface order of each lens. For example, surface number 1 represents the object side of the first lens 110, surface number 2 represents the image side of the first lens 110, and so on; 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, a negative value represents that the surface bends towards the object side, INF represents that the radius of curvature is infinite, and PL represents that the surface is a plane; 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 coefficient represents the numerical value of the best-fit conic coefficient of the aspherical surface; STO represents the aperture stop.

[0099] Table 2 shows the numerical values of the variable spacing in Table 1.

[0100] Table 2 Design values of the variable spacing at the wide-angle end and the telephoto end of the zoom lens

[0101] Wide-angle end Telephoto end Variable spacing 1 12 3.82 Variable spacing 2 3.06 0.36

[0102] The aspherical surface shape equation Z thereof satisfies:[[]]

[0103]

[0104] Among them, Z is the distance sagitta 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 is the curvature of the fitted spherical surface, c = 1 / R, and R represents the paraxial radius of curvature of the mirror surface; K is the conic coefficient; A, B, C, D, E, F, G are the high-order aspherical coefficients.

[0105] Exemplarily, Table 3 details the aspherical coefficients of each lens in the first embodiment in a feasible implementation manner.

[0106] Table 3 Design values of the aspherical coefficients of each lens in the zoom lens

[0107]

[0108]

[0109] Among them, 2.6618233e-05 indicates that the coefficient B with the surface number 3 is 2.6618233 * 10 -5 , and so on.

[0110] The zoom lens provided by this embodiment has reached the following technical indicators:

[0111] Table 4 Technical indicators of the zoom lens

[0112] Wide-angle end Telephoto end Aperture 1.013 1.18 Focal length 4.84 8.02 Field of view angle 138 66.7

[0113] Furthermore, Figure 3 is the spherical aberration curve diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end. As Figure 3 shown, the spherical aberration of this zoom lens at different wavelengths (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) is within 0.013mm, and 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 by the embodiment of the present invention can correct aberrations well at the wide-angle end.

[0114] Figure 4 is the ray fan diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end. As Figure 4 shown, the imaging ranges of rays with different wavelengths (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) at different field angles of this zoom lens are all within 20μm and the curves are very concentrated, ensuring that the aberrations in different field regions are small, that is, it shows that this zoom lens corrects the aberrations of the optical system well at the wide-angle end.

[0115] Figure 5 is the spot diagram of the zoom lens provided by Embodiment 1 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 the dispersion pattern formed by the intersection points of many rays emitted from a point light source with the image plane no longer concentrating at the same point due to aberrations after passing through the optical system. As Figure 5As shown in the figure, for the zoom lens provided by the embodiment of the present invention, the dispersion patterns of light rays with different wavelengths (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) at each field of view are relatively concentrated and evenly distributed. There is no phenomenon that the dispersion pattern at a certain field of view is separated vertically by a large margin with the change of wavelength, indicating no obvious purple fringing. At the same time, the root mean square radius values (RMS radii) of light rays with different wavelengths (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) at each field of view position of the zoom lens are 1.578μm, 2.281μm, 3.179μm, 2.834μm, 2.539μm, and 2.861μm respectively, indicating that the RMS radius of each field of view is less than 3.5μm. That is to say, the zoom lens has low chromatic aberration and spherical aberration at the wide-angle end, solves the purple fringing problem of imaging in each band, and can achieve high-resolution imaging.

[0116] Figure 6 The field curvature distortion diagram of the zoom lens provided by Embodiment 1 of the present invention at the wide-angle end is shown in Figure 6 As shown in the figure, 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 unit; where T represents meridian and S represents sagittal; Figure 6 It can be seen that for the zoom lens provided by this embodiment, from the light with a wavelength of 436nm to the light with a wavelength of 656nm, 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 unit; Figure 6 It can be seen that the distortion of the zoom lens provided by this embodiment at the wide-angle end is well corrected, and the imaging distortion is small, meeting the requirement of low distortion.

[0117] Figure 7 The spherical aberration curve diagram of the zoom lens provided by Embodiment 1 of the present invention at the telephoto end is shown in Figure 7 As shown in the figure, the spherical aberration of the zoom lens at different wavelengths (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) is within 0.015mm. The curves of 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 by the embodiment of the present invention can better correct aberration at the telephoto end.

[0118] Figure 8 The ray fan diagram of the zoom lens provided by Embodiment 1 of the present invention at the telephoto end is shown in Figure 8As shown, the imaging ranges of light rays with different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm) at different field angles of this zoom lens are all within 20 μm and the curves are very concentrated, ensuring that the aberration in different field regions is small, which also indicates that this zoom lens corrects the aberration of the optical system well at the telephoto end.

[0119] Figure 9 The spot diagram of the zoom lens provided in the first embodiment of the present invention at the telephoto end is as Figure 9 As shown, for the zoom lens provided in the embodiment of the present invention, the dispersion patterns of light rays with different wavelengths (0.4360 μm, 0.4861 μm, 0.5460 μm, 0.5876 μm, and 0.6563 μm) at each field are relatively concentrated and the distribution is also relatively uniform. There is no phenomenon that the dispersion patterns at a certain field are separated widely 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 (0.4360 μm, 0.4861 μm, 0.5460 μm, 0.5876 μm, and 0.6563 μm) at each field position of this zoom lens are 1.793 μm, 2.681 μm, 2.774 μm, 2.922 μm, 3.168 μm, and 3.144 μm respectively, indicating that the RMS radii of each field are all less than 3.5 μm, which also means 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.

[0120] Figure 10 The field curvature and distortion diagram of the zoom lens provided in the first embodiment of the present invention at the telephoto end is as Figure 10 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 Figure 10 it can be seen that for the zoom lens provided in this embodiment, from the light with a wavelength of 436 nm to the light with a wavelength of 656 nm, 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 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 it meets the requirement of low distortion.

[0121] Embodiment 2

[0122] Figure 11 The structural schematic diagram of the zoom lens provided in the second embodiment of the present invention at the wide-angle end Figure 12 The structural schematic diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end is asFigure 11 and Figure 12 As shown in Figure 12 , the zoom lens provided in the second embodiment of the present invention includes a focusing lens group 10, a fixed lens group 11, and a varifocal lens group 12 arranged in sequence from the object plane to the image plane along the optical axis. The focusing lens group 10 has a negative optical power, the fixed lens group 11 has a positive optical power, and the varifocal lens group 12 has a positive optical power. The focusing lens group 10 includes a first lens 110, a second lens 120, and a third lens 130 arranged in sequence from the object plane to the image plane along the optical axis; the fixed lens group 11 includes a fourth lens 140; the varifocal lens group 12 includes a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, a ninth lens 190, and a tenth lens 200 arranged in sequence from the object plane to the image plane along the optical axis; the first lens 110 has a negative optical power, the second lens 120 has a negative optical power, the third lens 130 has a positive optical power, the fourth lens 140 has a positive optical power, the fifth lens 150 has a positive optical power, the sixth lens 160 has a positive optical power, the seventh lens 170 has a negative optical power, the eighth lens 180 has a positive optical power, the ninth lens 190 has a positive optical power, and the tenth lens 200 has a negative optical power. Among them, the aperture stop 210 is disposed in the optical path between the third lens 130 and the fourth lens 140; the sixth lens 160, the seventh lens 170, and the eighth lens 180 form a triple cemented lens group.

[0123] Exemplarily, Table 5 details the specific optical and 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 in Figure 12 .

[0124] Table 5 Design values of the optical and physical parameters of the zoom lens

[0125]

[0126]

[0127] Among them, the surface numbers are numbered according to the surface order of each lens. For example, surface number 1 represents the object side surface of the first lens 110, surface number 2 represents the image side surface of the first lens 110, and so on; 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, a negative value represents that the surface bends towards the object side, INF represents that the radius of curvature is infinite, and PL represents that the surface is a plane; 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, and a space represents that the current position is air with a refractive index of 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, and a space represents that the current position is air; the K coefficient represents the numerical value of the best-fit conic coefficient of the aspherical surface; STO represents the aperture stop.

[0128] Table 6 shows the values of the variable pitch in Table 5.

[0129] Table 6 Design values of the variable pitch at the wide-angle end and the telephoto end of the zoom lens

[0130] Wide-angle end Telephoto end Variable spacing 1 12.25 3.86 Variable spacing 2 3.09 0.456

[0131] The aspherical surface shape equation Z of it satisfies:

[0132]

[0133] Among them, Z is the sagitta, the distance from the vertex of the aspherical surface at the position with a height of y along the optical axis direction; c is the curvature of the fitted spherical surface, c = 1 / R, and R represents the paraxial radius of curvature of the mirror surface; K is the conic coefficient; A, B, C, D, E, F, G are the high-order aspherical coefficients.

[0134] Exemplarily, Table 7 details the aspherical coefficients of each lens in the second embodiment in a feasible implementation manner.

[0135] Table 7 Design values of the aspherical coefficients of each lens in the zoom lens

[0136] Surface number A B C D E F G 3 -0.0014374465 2.6773614e-05 -5.1341332e-07 7.7382437e-09 -5.7832248e-11 6.8675791e-14 1.2090465e-15 4 -0.00055388087 -1.873042e-06 1.8098463e-07 -1.6290478e-09 -1.716874e-11 2.7228882e-13 1.7125614e-19 5 -2.3346704e-07 -9.9774564e-06 3.0474961e-07 -2.5024993e-09 -6.4512013e-11 5.3040115e-13 7.2463805e-17 6 -0.0002412624 5.1643051e-06 -7.2598073e-08 3.1017664e-09 -1.2594752e-10 1.0832015e-12 5.7448199e-16 7 -0.00010185772 1.8650327e-06 -1.1815054e-07 2.9333777e-09 -2.4713309e-11 -1.6517549e-13 4.5922684e-15 8 -0.00015344151 1.104366e-07 -7.1380779e-09 -2.8344035e-10 8.5614679e-12 -6.9440221e-14 4.2469245e-16 10 2.9691447e-05 6.8126562e-07 -3.3566691e-08 6.7489398e-10 -7.6240054e-12 3.0976607e-14 -1.9834139e-19 11 0.00010435704 -1.8463276e-07 -1.7843608e-08 3.9442521e-10 -4.5925285e-12 1.8230856e-14 3.1110556e-18 16 0.00035161827 -1.5646295e-05 -3.2962896e-07 7.3415203e-08 -4.6451519e-09 1.3784768e-10 -1.5838734e-12 17 0.00025179379 -3.2487e-05 5.9848838e-07 1.2795263e-08 -2.352749e-09 1.0852429e-10 -1.6794226e-12 18 -0.0036633043 7.0306266e-05 -2.5671287e-06 3.327323e-08 -1.4358442e-09 2.1145562e-10 -5.4222504e-12 19 -0.0028259466 0.00011513254 -4.9387748e-06 6.6350811e-08 5.3831575e-09 -2.2419308e-10 2.2701741e-12

[0137] Among them, 2.6773614e-05 means that the coefficient B of surface number 3 is 2.6773614 * 10 -5 , and so on.

[0138] The zoom lens provided in this embodiment reaches the following technical indicators:

[0139] Table 8 Technical indicators of the zoom lens

[0140] Wide-angle end Telephoto end Aperture 1.04 1.19 Focal length 4.85 8.022 Field of view angle 138 66

[0141] Further, 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 (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) is within 0.02mm, 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 aberration well at the wide-angle end.

[0142] Figure 14 is the light 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 (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) 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.

[0143] 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 15 shown, for the zoom lens provided in the embodiment of the present invention, the dispersion patterns of light rays with different wavelengths (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) at each field are relatively concentrated and the distribution is relatively uniform. There is no phenomenon that the dispersion pattern at a certain field is separated vertically with the wavelength very far apart, indicating no obvious purple fringing. At the same time, the root mean square radius values (RMS radii) of light rays with different wavelengths (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) at each field position of the zoom lens are 2.463μm, 2.297μm, 2.556μm, 2.605μm, 2.561μm, and 2.852μm respectively, indicating that the RMS radii of each field are all less than 3μm, that is, it shows that 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.

[0144] Figure 16 is the field curvature and distortion diagram of the zoom lens provided in the second embodiment of the present invention at the wide-angle end. As Figure 16As 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 unit; where T represents meridian and S represents sagittal; from Figure 16 it can be seen that for the zoom lens provided in this embodiment, from light with a wavelength of 436 nm to light with a wavelength of 656 nm, the field curvature is effectively controlled, that is, when imaging, the difference in image quality 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 unit; from Figure 16 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.

[0145] Figure 17 The spherical aberration curve diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end is shown in Figure 17 As shown, the spherical aberration of the zoom lens at different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm) is within 0.03 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 second embodiment of the present invention can well correct the aberration at the telephoto end.

[0146] Figure 18 The ray fan diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end is shown in Figure 18 As shown, the imaging ranges of light rays with different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 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.

[0147] Figure 19 The spot diagram of the zoom lens provided in the second embodiment of the present invention at the telephoto end is shown in Figure 19As shown in the figure, for the zoom lens provided by the embodiment of the present invention, the dispersion patterns of light with different wavelengths (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) are relatively concentrated and evenly distributed in each field of view. There is no phenomenon that the dispersion pattern in a certain field of view is widely separated up and down with the change of wavelength, indicating no obvious purple fringing. At the same time, the root mean square radius values (RMS radius) of light with different wavelengths (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) at each field of view position of this zoom lens are 1.193μm, 1.974μm, 2.276μm, 2.261μm, 2.758μm, and 3.257μm respectively, indicating that the RMS radius of each field of view is less than 3.5μm. That is to say, this 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.

[0148] Figure 20 The field curvature distortion diagram of the zoom lens provided by the second embodiment of the present invention at the telephoto end is as Figure 20 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 unit; where T represents meridian and S represents sagittal; Figure 20 It can be seen that for the zoom lens provided by this embodiment, from the light with a wavelength of 436nm to the light with a wavelength of 656nm, the field curvature is effectively controlled. That is, during 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 unit; Figure 20 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.

[0149] Embodiment 3

[0150] Figure 21 The schematic structural diagram of the zoom lens provided by the third embodiment of the present invention at the wide-angle end is Figure 22 The schematic structural diagram of the zoom lens provided by the third embodiment of the present invention at the telephoto end is as Figure 21 and Figure 22As shown in the figure, the zoom lens provided in the third embodiment of the present invention includes a focusing lens group 10, a fixed lens group 11, and a variable magnification lens group 12 arranged in sequence along the optical axis from the object plane to the image plane. The focusing lens group 10 has a negative optical power, the fixed lens group 11 has a positive optical power, and the variable magnification lens group 12 has a positive optical power. The focusing lens group 10 includes a first lens 110, a second lens 120, and a third lens 130 arranged in sequence along the optical axis from the object plane to the image plane; the fixed lens group 11 includes a fourth lens 140; the variable magnification lens group 12 includes a fifth lens 150, a sixth lens 160, a seventh lens 170, an eighth lens 180, a ninth lens 190, and a tenth lens 200 arranged in sequence along the optical axis from the object plane to the image plane; the first lens 110 has a negative optical power, the second lens 120 has a negative optical power, the third lens 130 has a positive optical power, the fourth lens 140 has a positive optical power, the fifth lens 150 has a positive optical power, the sixth lens 160 has a positive optical power, the seventh lens 170 has a negative optical power, the eighth lens 180 has a positive optical power, the ninth lens 190 has a positive optical power, and the tenth lens 200 has a negative optical power. Among them, the aperture stop 210 is disposed in the optical path between the third lens 130 and the fourth lens 140; the sixth lens 160, the seventh lens 170, and the eighth lens 180 form a triple cemented lens group.

[0151] Exemplarily, Table 9 details the specific optical physical parameters of each lens in the zoom lens provided in the third embodiment of the present invention in a feasible implementation manner. The zoom lens in Table 9 corresponds to Figure 21 and Figure 22 the zoom lens shown.

[0152] Table 9 Design values of the optical physical parameters of the zoom lens

[0153] Surface number Surface type Radius of curvature Thickness Material (nd) Material (vd) K coefficient 1 Spherical surface 71.14119 0.7 1.708 59.2 2 Spherical surface 9.312207 4.7 3 Aspherical surface 31.08494 1.32 1.541 60.6 -3.580119 4 Aspherical surface 9.141314 0.26 -5.948183 5 Aspherical surface 20.29678 2.02 1.642 23.9 -3.295364 6 Aspherical surface 161.1996 Variable spacing 1 -27.68332 7 Aspherical surface -14.69152 2.8 1.649 20.3 1.910976 8 Aspherical surface -14.56128 0.62 -1.6847 STO PL INF Variable spacing 2 10 Aspherical surface 12.08137 5.42 1.548 61.6 -1.733612 11 Aspherical surface -18.29334 0.07 -0.5545877 12 Spherical surface 12.8272 3.27 1.589 66.2 13 Spherical surface -266.2261 0.92 1.721 25.2 14 Spherical surface 6.859446 5.03 1.434 74.9 15 Spherical surface -32.12532 0.67 16 Aspherical surface -15.25059 2.55 1.677 18.9 -38.71594 17 Aspherical surface -12.86461 0.14 -16.86939 18 Aspherical surface 7.222061 1.35 1.549 57.2 -1.915409 19 Aspherical surface 5.312801 -3.462593

[0154] Among them, the surface number is numbered according to the surface order of each lens. For example, the surface number 1 represents the object side of the first lens 110, the surface number 2 represents the image side of the first lens 110, and so on; the radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image plane side, a negative value represents that the surface bends towards the object plane side, INF represents that the radius of curvature is infinite, and PL represents that the surface is a plane; 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 coefficient represents the numerical value of the best-fit conic coefficient of the aspherical surface; STO represents the aperture stop.

[0155] Table 10 shows the values of the variable pitch in Table 9.

[0156] Design values of the variable pitch at the wide-angle end and the telephoto end of the zoom lens in Table 10

[0157] Wide-angle end Telephoto end Variable spacing 1 11.2 3.55 Variable spacing 2 3.26 0.58

[0158] The aspherical surface shape equation Z satisfies:

[0159]

[0160] Where Z is the distance sagitta from the vertex of the aspherical surface at the position with height y along the optical axis; c is the curvature of the fitted spherical surface, c = 1 / R, and R represents the paraxial curvature radius of the mirror surface; K is the conic coefficient; A, B, C, D, E, F, G are the high-order aspherical coefficients.

[0161] Exemplarily, Table 11 details the aspherical coefficients of each lens in the third embodiment in a feasible implementation manner.

[0162] Design values of the aspherical coefficients of each lens in the zoom lens in Table 11

[0163]

[0164]

[0165] Where 2.6449238e-05 means that the coefficient B for the surface number 3 is 2.6449238*10 -5 , and so on.

[0166] The zoom lens provided in this embodiment reaches the following technical indicators:

[0167] Table 12 Technical indicators of the zoom lens

[0168] Wide-angle end Telephoto end Aperture 1.08 1.19 Focal length 4.85 8.05 Field of view angle 138° 66°

[0169] Furthermore, Figure 23 is the spherical aberration curve graph of the zoom lens provided in the third embodiment of the present invention at the wide-angle end. As Figure 23 shown, the spherical aberration of this zoom lens at different wavelengths (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) is within 0.02mm, and the curves at different wavelengths are relatively concentrated, indicating that the axial aberration of this zoom lens is small. Therefore, it can be known that the zoom lens provided in the third embodiment of the present invention can correct aberrations well at the wide-angle end.

[0170] Figure 24 is the ray fan diagram of the zoom lens provided in the third embodiment of the present invention at the wide-angle end. As Figure 24As shown, the imaging ranges of light rays with different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, and 0.656 μm) at different field angles of this zoom lens are all within 20 μm and the curves are very concentrated, ensuring that the aberrations in different field regions are small, which also indicates that this zoom lens corrects the aberrations of the optical system well at the wide-angle end.

[0171] Figure 25 This is 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 the fact that many light rays emitted from a point light source, after passing through an optical system, due to aberrations, their intersection points with the image plane are no longer concentrated at the same point, but form a diffused pattern scattered within a certain range. As Figure 25 shown, for the zoom lens provided in the embodiment of the present invention, the diffused patterns of light rays with different wavelengths (0.4360 μm, 0.4861 μm, 0.5460 μm, 0.5876 μm, and 0.6563 μm) at each field are relatively concentrated and the distribution is also relatively uniform. There is no phenomenon that the diffused pattern at a certain field separates significantly up and down with the wavelength, indicating no obvious purple fringing. At the same time, the root mean square radius values (RMS radius) of light rays with different wavelengths (0.4360 μm, 0.4861 μm, 0.5460 μm, 0.5876 μm, and 0.6563 μm) at each field position of this zoom lens are 2.262 μm, 2.010 μm, 2.835 μm, 2.937 μm, 2.769 μm, and 3.417 μm respectively, indicating that the RMS radius of each field is less than 3.5 μm, 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.

[0172] Figure 26 This is the field curvature and distortion diagram of the zoom lens provided in Embodiment 3 of the present invention at the wide-angle end. As Figure 26 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 26 it can be seen that for the zoom lens provided in this embodiment, from the light with a wavelength of 436 nm to the light with a wavelength of 656 nm, 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 26 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 requirements of low distortion.

[0173] Figure 27This is the spherical aberration curve diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end, as Figure 27 shown. The spherical aberration of this zoom lens at different wavelengths (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) is within 0.03mm, and 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.

[0174] Figure 28 This is the ray fan diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end, as Figure 28 shown. The imaging ranges of light rays with different wavelengths (0.436μm, 0.486μm, 0.546μm, 0.588μm, and 0.656μm) 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, that is, it shows that this zoom lens corrects the aberration of the optical system well at the telephoto end.

[0175] Figure 29 This is the spot diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end, as Figure 29 shown. For the zoom lens provided in the embodiment of the present invention, the dispersion patterns of light rays with different wavelengths (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) at each field are relatively concentrated and the distribution is relatively uniform, and there is no phenomenon that the dispersion patterns at a certain field are separated widely 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 (0.4360μm, 0.4861μm, 0.5460μm, 0.5876μm, and 0.6563μm) at each field position of this zoom lens are 1.183μm, 1.413μm, 1.808μm, 1.980μm, 2.423μm, and 2.713μm respectively, indicating that the RMS radii of each field are less than 3μm, 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.

[0176] Figure 30 This is the field curvature and distortion diagram of the zoom lens provided in Embodiment 3 of the present invention at the telephoto end, as Figure 30 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 30It can be seen that for the zoom lens provided in this embodiment, from the light with a wavelength of 436 nm to the light with a wavelength of 656 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; by Figure 30 It can be seen that the distortion of the zoom lens provided in this embodiment at the telephoto end is well corrected, with a small imaging distortion, meeting the requirements of low distortion.

[0177] To illustrate the above embodiments more clearly, Table 13 details the specific optical physical parameters of each lens in the zoom lenses provided in Embodiments 1 to 3 of the present invention, as well as other feasible optical physical parameters.

[0178] Table 13 Design values of the optical physical parameters of the zoom lens

[0179] Example 1 Example 2 Example 3 Lower limit Upper limit |Z1 / B1| 1.023 1.049 1.062 0.8 1.3 |Z1 / G1| 16.3 16.8 23.7 10 30 |B1 / G1| 15.92 16 22.35 10 30 |φ1 / B1| 0.79 0.75 0.78 0.6 1 |φ2 / B1| 0.48 0.51 0.48 0.3 0.7 |φ3 / B1| 0.33 0.33 0.33 0.1 0.6 |φ5 / Z1| 0.75 0.75 0.78 0.5 1.2 |φ6 / Z1| 0.56 0.56 0.53 0.25 0.85 |φ7 / Z1| 1.24 1.23 1.2 0.7 2 |φ8 / Z1| 0.86 0.85 0.82 0.4 1.3 |φ9 / Z1| 0.15 0.14 0.13 0.06 0.4 |φ10 / Z1| 0.21 0.2 0.23 0.08 0.55 n1 1.636 1.58 1.708 1.5 1.9 n2 1.534 1.543 1.541 1.45 1.85 n3 1.649 1.634 1.642 1.55 2.1 n4 1.672 1.672 1.649 1.5 1.85 n5 1.497 1.497 1.548 1.4 1.75 n6 1.593 1.593 1.589 1.4 1.75 n7 1.718 1.717 1.721 1.55 1.95 n8 1.437 1.437 1.433 1.4 1.7 n9 1.674 1.689 1.677 1.5 1.85 n10 1.533 1.542 1.549 1.4 1.75

[0180] 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 herein. Various obvious changes, re-adjustments, 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, more other equivalent embodiments can be included, 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 focusing lens group, a fixed lens group, and a zoom lens group arranged in sequence along the optical axis from the object plane to the image plane; the fixed lens group is fixedly arranged, and the focusing lens group and the zoom lens group are arranged to move along the optical axis direction; the focusing lens group has a negative optical power, the fixed lens group has a positive optical power, and the zoom lens group has a positive optical power; the focusing lens group includes a first lens, a second lens, and a third lens arranged in sequence along the optical axis from the object plane to the image plane; the fixed lens group includes a fourth lens; the zoom lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence along the optical axis from the object plane to the image plane; the first lens has a negative optical power, the second lens has a negative optical power, and the third lens has a positive optical power; the fourth lens has a positive optical power; the fifth lens has a positive optical power, the sixth lens has a positive optical power, the seventh lens has a negative optical power, the eighth lens has a positive optical power, the ninth lens has a positive optical power, and the tenth lens has a negative optical power; the first lens, the sixth lens, the seventh lens, and the eighth lens are glass spherical lenses; the second lens, the third lens, the fourth lens, the fifth lens, the ninth lens, and the tenth lens are aspherical lenses; the optical power of the zoom lens group is Z1, the optical power of the fixed lens group is G1, and the optical power of the focusing lens group is B1, where: 0.8 ≤ |Z1 / B1| ≤ 1.3; 10 ≤ |Z1 / G1| ≤ 30; 10 ≤ |B1 / G1| ≤ 30.

2. The zoom lens according to claim 1, characterized in that, the sixth lens, the seventh lens, and the eighth lens form a triple cemented lens group.

3. The zoom lens according to claim 1, characterized in that, the optical power of the first lens is φ1, the optical power of the second lens is φ2, the optical power of the third lens is φ3, 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 zoom lens group is Z1, and the optical power of the focusing lens group is B1, where: 0.6 ≤ |φ1 / B1| ≤ 1; 0.3 ≤ |φ2 / B1| ≤ 0.7; 0.1 ≤ |φ3 / B1| ≤ 0.6; 0.5 ≤ |φ5 / Z1| ≤ 1.2; 0.25 ≤ |φ6 / Z1| ≤ 0.85; 0.7 ≤ |φ7 / Z1| ≤ 2; 0.4 ≤ |φ8 / Z1| ≤ 1.3; 0.06 ≤ |φ9 / Z1| ≤ 0.4; 0.08 ≤ |φ10 / Z1| ≤ 0.

55.

4. 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, where: 1.5 ≤ n1 ≤ 1.9; 1.45 ≤ n2 ≤ 1.85; 1.55 ≤ n3 ≤ 2.1; 1.5 ≤ n4 ≤ 1.85; 1.4 ≤ n5 ≤ 1.75; 1.4 ≤ n6 ≤ 1.75; 1.55 ≤ n7 ≤ 1.95; 1.4 ≤ n8 ≤ 1.7; 1.5 ≤ n9 ≤ 1.85; 1.4 ≤ n10 ≤ 1.

75.

5. The zoom lens according to claim 1, wherein the aperture of the zoom lens at the wide-angle end is Fw, and the aperture of the zoom lens at the telephoto end is Ft, where 0.9 ≤ Fw~Ft ≤ 1.

6.

6. The zoom lens according to claim 1, wherein the field of view angle of the zoom lens at the wide-angle end is FOV-w, and the field of view angle of the zoom lens at the telephoto end is FOV-t, where: FOV-w ≥ 90°; FOV-t ≤ 70°.

7. The zoom lens according to claim 1, wherein the image plane diameter IC of the zoom lens and the overall optical length TTL of the zoom lens satisfy 0.05 ≤ IC / TTL ≤ 0.

25.

8. The zoom lens according to claim 1, wherein the zoom lens further includes a diaphragm; the diaphragm is located in the optical path between the third lens and the fourth lens.

Images