Zoom lens

Abstract

The application discloses a zoom lens, which comprises, in order from the object side to the image side along the optical axis, a first fixed lens group with positive refractive power, the first fixed lens group comprising only five lenses; a first moving lens group with negative refractive power, the first moving lens group comprising only four lenses; a second moving lens group with positive refractive power, the second moving lens group comprising only five or six lenses; a second fixed lens group with negative refractive power, the second fixed lens group comprising only six or seven lenses; a third moving lens group with positive refractive power, the third moving lens group comprising only three lenses; during zooming, the first fixed lens group and the second fixed lens group are fixedly arranged, the first moving lens group and the second moving lens group move between the object side and the image side along the optical axis to realize continuous zooming between a wide-angle end and a long-focus end, and the third moving lens group moves between the object side and the image side along the optical axis to realize compensation of image plane position change during zooming.

Description

Technical Field

[0001] This application relates to the field of optical devices, specifically to a zoom lens. Background Technology

[0002] Zoom lenses can continuously change their focal length within a certain range during use, making them adaptable to different usage scenarios, and their market demand is constantly increasing.

[0003] With the development of modern society and the advancement of science and technology, zoom optical systems have been widely used in all aspects of life, such as security monitoring and intelligent transportation. The usage of zoom lenses is increasing year by year, thus placing increasingly higher demands on their optical performance and product stability.

[0004] However, the following problems still exist in existing zoom lenses:

[0005] 1. Existing zoom lenses have small imaging target sizes and low image resolution.

[0006] 2. Existing zoom lenses experience focus drift in high and low temperature environments, making their image quality susceptible to severe environmental impact.

[0007] 3. Existing zoom lenses have significant distortion, causing the captured images of people or scenery to be distorted and unable to accurately reproduce the scene.

[0008] Therefore, designing a zoom lens with at least one of the following characteristics—large target area, high resolution, low distortion, and no defocusing at high and low temperatures—is one of the hot research topics for those skilled in the art. Summary of the Invention

[0009] This application provides a zoom lens, characterized in that it comprises, sequentially from the object side to the image side along the optical axis: a first fixed lens group with positive optical power, comprising only five lenses, namely, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, arranged sequentially from the object side to the image side; a first movable lens group with negative optical power, comprising only four lenses, namely, a sixth lens, a seventh lens, an eighth lens, and a ninth lens, arranged sequentially from the object side to the image side; and a second movable lens group with positive optical power, comprising only five or six lenses, arranged sequentially from the object side to the image side. The image side consists of a tenth lens and an eleventh lens group with positive optical power. When the second movable lens group comprises only five lenses, the eleventh lens group consists of four lenses with negative optical power, positive optical power, negative optical power, and negative optical power, or four lenses with negative optical power, positive optical power, negative optical power, and positive optical power, from the object side to the image side. When the second movable lens group comprises only six lenses, the eleventh lens group consists of five lenses with negative optical power, positive optical power, negative optical power, positive optical power, and negative optical power, from the object side to the image side. The second fixed lens group with negative optical power... The second fixed lens group consists of only six or seven lenses, arranged sequentially from the object side to the image side as the twelfth lens, the thirteenth lens group with positive or negative optical power, the fourteenth lens, the fifteenth lens, and the sixteenth lens. When the second fixed lens group consists of only six lenses, the thirteenth lens group consists of two lenses with negative and positive optical power, arranged sequentially from the object side to the image side. When the second fixed lens group consists of only seven lenses, the thirteenth lens group consists of three lenses with positive, negative, and positive optical power, or three lenses with negative, positive, and negative optical power, arranged sequentially from the object side to the image side. The zoom lens has a third moving lens group with positive optical power, which consists of only three lenses: the seventeenth lens, the eighteenth lens, and the nineteenth lens, arranged sequentially from the object side to the image side. The zoom lens contains five lens groups with optical power. During zooming, the first and second fixed lens groups are fixed in place, while the first and second moving lens groups move along the optical axis between the object side and the image side to achieve continuous zooming between the wide-angle and telephoto ends. The third moving lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming.

[0010] According to an exemplary embodiment of this application, the first lens has positive optical power and its shape is convex-convex; the second lens has negative optical power and its shape is convex-concave or concave-convex; the third lens has positive optical power and its shape is convex-convex; the fourth lens has negative optical power and its shape is concave-concave or concave-convex; and the fifth lens has positive optical power and its shape is concave-convex or its side surface is convex.

[0011] According to an exemplary embodiment of this application, the sixth lens has negative optical power and its shape is concave-concave; the seventh lens has positive optical power and its shape is concave-convex or convex-convex; the eighth lens has negative optical power and its object side is concave; the ninth lens has negative optical power and its shape is concave-concave; and the tenth lens has positive optical power and its object side is convex.

[0012] According to an exemplary embodiment of this application, the twelfth lens has negative optical power and its shape is convex-concave; the fourteenth lens has positive or negative optical power and its shape is convex-concave, concave-concave, or convex-convex; the fifteenth lens has positive optical power and its image-side surface is convex; and the sixteenth lens has negative optical power and its shape is concave-concave.

[0013] According to an exemplary embodiment of this application, the seventeenth lens has positive or negative optical power and its shape is convex-concave; the eighteenth lens has positive or negative optical power and its shape is convex-concave or convex-convex; the nineteenth lens has positive optical power and its shape is convex-convex or concave-convex; the seventeenth lens and the eighteenth lens have opposite positive and negative optical powers.

[0014] According to an exemplary embodiment of this application, the zoom lens satisfies at least one of the following conditions: 2.201≤FG1 / FW≤3.007; -0.964≤FG2 / FW≤-0.716; 0.653≤FG3 / FW≤1.141; -1.229≤FG4 / FW≤-0.761; 0.903≤FG5 / FW≤1.434; wherein FG1 is the effective focal length of the first fixed lens group, FG2 is the effective focal length of the first movable lens group, FG3 is the effective focal length of the second movable lens group, FG4 is the effective focal length of the second fixed lens group, FG5 is the effective focal length of the third movable lens group, and Fw is the effective focal length at the wide-angle end of the zoom lens.

[0015] According to an exemplary embodiment of this application, the zoom lens satisfies at least one of the following conditions: 1.049≤F1 / FG1≤1.360; -2.290≤F2 / FG1≤-1.152; 0.663≤F3 / FG1≤1.099; -1.117≤F4 / FG1≤-0.461; 0.678≤F5 / FG1≤2.449; 1.222≤F6 / FG2≤2.802; -2.648≤F7 / FG2≤-0.831; 0.990≤F8 / FG2≤2.542; 1.288≤F9 / FG2≤2.382;1.002≤F10 / FG3≤1.760;2.606≤FB11 / FG3≤20.404;1.031≤F12 / FG4≤5.944;-1.382≤FB13 / FG4≤0.793;-0.523≤F14 / FG4≤1.456;-1.882≤F15 / FG4≤-0.325;0.365≤F16 / FG4≤0.674;-3.477≤F17 / FG5≤1.854;-2.132≤F18 / FG5≤1.045; 0.804 ≤ F19 / FG5 ≤ 3.003; where F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, FG1 is the effective focal length of the first fixed lens group, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, FG2 is the effective focal length of the first movable lens group, and F10 is the effective focal length of the tenth lens. F11 is the effective focal length of the eleventh lens group, FG3 is the effective focal length of the second moving lens group, F12 is the effective focal length of the twelfth lens, F13 is the effective focal length of the thirteenth lens group, F14 is the effective focal length of the fourteenth lens, F15 is the effective focal length of the fifteenth lens, F16 is the effective focal length of the sixteenth lens, FG4 is the effective focal length of the second fixed lens group, F17 is the effective focal length of the seventeenth lens, F18 is the effective focal length of the eighteenth lens, F19 is the effective focal length of the nineteenth lens, and FG5 is the effective focal length of the third moving lens group.

[0016] According to an exemplary embodiment of this application, the zoom lens satisfies at least one of the following conditions: 6.512≤TTL / H≤8.401; 3.240≤TTL / FW≤4.180; 0.900≤TTL / FT≤1.162; where TTL is the total optical length of the zoom lens, H is the holographic height of the zoom lens, Fw is the effective focal length at the wide-angle end of the zoom lens, and FT is the effective focal length at the telephoto end of the zoom lens.

[0017] According to an exemplary embodiment of this application, the zoom lens satisfies at least one of the following conditions: 2.446≤FG1 / FW≤2.734; -0.876≤FG2 / FW≤-0.796; 0.725≤FG3 / FW≤1.037; -1.117≤FG4 / FW≤-0.846; 1.003≤FG5 / FW≤1.304; wherein, FG1 is the effective focal length of the first fixed lens group, FG2 is the effective focal length of the first movable lens group, FG3 is the effective focal length of the second movable lens group, FG4 is the effective focal length of the second fixed lens group, FG5 is the effective focal length of the third movable lens group, and Fw is the effective focal length at the wide-angle end of the zoom lens.

[0018] According to an exemplary embodiment of this application, the zoom lens satisfies at least one of the following conditions: 1.165≤F1 / FG1≤1.236; -2.082≤F2 / FG1≤-1.280; 0.737≤F3 / FG1≤0.999; -1.015≤F4 / FG1≤-0.512; 0.753≤F5 / FG1≤2.226; 1.358≤F6 / FG2≤2.547; -2.407≤F7 / FG2≤-0.923; 1.100≤F8 / FG2≤2.311; 1.431≤F9 / FG2≤2.165;1.113≤F10 / FG3≤1.600;2.896≤FB11 / FG3≤18.549;1.146≤F12 / FG4≤5.404;-1.256≤FB13 / FG4≤0.721;-0.475≤F14 / FG4≤1.324;-1.711≤F15 / FG4≤-0.361;0.406≤F16 / FG4≤0.613;-3.161≤F17 / FG5≤1.685;-1.938≤F18 / FG5≤0.950; 0.893 ≤ F19 / FG5 ≤ 2.730; where F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, FG1 is the effective focal length of the first fixed lens group, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, FG2 is the effective focal length of the first movable lens group, and F10 is the effective focal length of the tenth lens. F11 is the effective focal length of the eleventh lens group, FG3 is the effective focal length of the second moving lens group, F12 is the effective focal length of the twelfth lens, F13 is the effective focal length of the thirteenth lens group, F14 is the effective focal length of the fourteenth lens, F15 is the effective focal length of the fifteenth lens, F16 is the effective focal length of the sixteenth lens, FG4 is the effective focal length of the second fixed lens group, F17 is the effective focal length of the seventeenth lens, F18 is the effective focal length of the eighteenth lens, F19 is the effective focal length of the nineteenth lens, and FG5 is the effective focal length of the third moving lens group.

[0019] According to an exemplary embodiment of this application, the zoom lens satisfies at least one of the following conditions: 7.235≤TTL / H≤7.637; 3.600≤TTL / FW≤3.800; 1.000≤TTL / FT≤1.056; where TTL is the total optical length of the zoom lens, H is the holographic height of the zoom lens, Fw is the effective focal length at the wide-angle end of the zoom lens, and FT is the effective focal length at the telephoto end of the zoom lens.

[0020] The zoom lens provided according to the embodiments of this application adopts a zoom lens architecture with five groups: positive, negative, positive, negative, and positive. During zooming, the first fixed lens group and the second fixed lens group are fixedly set, while the first movable lens group and the second movable lens group move along the optical axis between the object side and the image side to achieve continuous zooming between the wide-angle end and the telephoto end. The third movable lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming. Furthermore, by rationally allocating the number of lenses in each lens group, the optical power of the lenses, the surface shape, and other optical parameters, at least one beneficial effect can be achieved, such as a large target surface (5 / 3″), low distortion (DIS absolute value ≤ 3.3%), high resolution, and no defocusing during high and low temperature processes from -40℃ to +80℃. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. In the drawings:

[0022] Figure 1 A schematic diagram of the zoom lens according to Embodiment 1 of this application is shown when it is at the wide-angle end, the middle end and the telephoto end;

[0023] Figure 2 A schematic diagram of the zoom lens according to Embodiment 2 of this application is shown when it is at the wide-angle end, the middle end and the telephoto end;

[0024] Figure 3 A schematic diagram of the zoom lens according to Embodiment 3 of this application is shown when it is at the wide-angle end, the middle end and the telephoto end;

[0025] Figure 4 A schematic diagram of the zoom lens according to Embodiment 4 of this application is shown when it is at the wide-angle end, the middle end and the telephoto end;

[0026] Figure 5 A schematic diagram of the zoom lens according to Embodiment 5 of this application is shown when it is at the wide-angle end, the middle end, and the telephoto end. Detailed Implementation

[0027] To better understand this application, various aspects of this application will be described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of this application and are not intended to limit the scope of this application in any way.

[0028] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0029] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0030] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprises," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. It should be noted that the longitudinal direction stated herein is perpendicular to the optical axis.

[0031] Unless otherwise specified, all terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly stated herein.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] According to an exemplary embodiment of this application, a zoom lens sequentially includes a first fixed lens group G1, a first movable lens group G2, a second movable lens group G3, a second fixed lens group G4, and a third movable lens group G5 along the optical axis from the object side to the image side.

[0034] In an exemplary embodiment, the first fixed lens group G1 of the zoom lens has a positive optical power. During the zoom process, the first fixed lens group G1 is fixedly set. By converging light, it is beneficial to reduce the aperture of the rear lens and achieve the requirement of small lens size. At the same time, it is beneficial to correct system aberrations and improve the lens imaging quality.

[0035] In an exemplary embodiment, the first fixed lens group G1 includes only five lenses, which are sequentially arranged along the optical axis from the object side to the image side as a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5.

[0036] In an exemplary embodiment, the first lens L1 may have positive optical power, and its object-side surface may be convex, as may its image-side surface. This configuration allows the positive optical power to quickly converge the incident beam, compressing subsequent beams and bringing them closer to the optical axis, which helps to shorten the overall system length. The biconvex shape effectively reduces spherical aberration, which helps to balance primary aberrations in the system and improves lens resolving power.

[0037] In an exemplary embodiment, the second lens L2 may have negative optical power, with its object-side surface being convex and its image-side surface being concave, or its object-side surface being concave and its image-side surface being convex. This configuration allows the negative optical power to diverge the light beam to compensate for the spherical aberration introduced by the front positive lens, thus improving the lens's image quality. The use of a convex-concave or concave-convex meniscus structure makes the light deflection smoother, which is beneficial for correcting field curvature and thereby reducing system tolerance sensitivity.

[0038] In an exemplary embodiment, the third lens L3 may have positive optical power, and its object-side surface may be convex, as may its image-side surface. This configuration allows the positive optical power to refocus diverging light beams, while the biconvex shape, in conjunction with the front lens group, corrects aberrations, thereby improving the lens's image quality.

[0039] In an exemplary embodiment, the fourth lens L4 can have negative optical power, with its object side being concave and its image side being either convex or concave. This configuration allows the negative optical power to diverge the light beam to balance the converging effect of the front element, optimizing the overall optical power distribution and facilitating a large target area effect in the lens. The use of a double-concave or concave-convex structure allows for gentle light deflection, aiding in the correction of system spherical aberration and field curvature, which helps improve lens resolution and reduce system tolerance sensitivity.

[0040] In an exemplary embodiment, the fifth lens L5 may have positive optical power, with its object-side surface being convex and its image-side surface being concave or flat. This configuration allows the positive optical power to converge the light beam, and the convex shape of the object-side surface helps to smoothly gather the edge field of view rays, suppressing coma and reducing lens sensitivity.

[0041] However, those skilled in the art should understand that, since the radius of curvature of the image side of the fifth lens L5 is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, which usually has little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0042] In an exemplary embodiment, the fifth lens L5 may have positive optical power, with its object-side surface being concave and its image-side surface being convex. This configuration allows the positive optical power to converge the light beam, and the concave-convex shape effectively corrects system field curvature, reduces spherical aberration increments, minimizes aberration fluctuations during zooming, and ultimately improves lens resolving power.

[0043] In an exemplary embodiment, the first movable lens group G2 of the zoom lens has a negative optical power. During the zoom process, the first movable lens group G2 moves along the optical axis from the object side to the image side, which can realize continuous zoom of the lens from the wide-angle end to the telephoto end, which is beneficial to improving the zoom ratio of the lens.

[0044] In an exemplary embodiment, the first movable lens group G2 includes only four lenses, which are sequentially arranged along the optical axis from the object side to the image side as a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9.

[0045] In an exemplary embodiment, the sixth lens L6 can have negative optical power, with both its object-side and image-side surfaces being concave. This configuration allows the negative optical power to diverge the light beam, balancing the system's optical power and eliminating residual chromatic aberration and spherical aberration in the preceding optical system, thus improving lens resolving power. The biconcave lens structure ensures smooth light deflection and effectively corrects system distortion, allowing the lens to meet low distortion requirements while reducing system tolerance sensitivity.

[0046] In an exemplary embodiment, the seventh lens L7 can have positive optical power, and its object-side surface can be concave or convex, while its image-side surface can be convex. This configuration allows the positive optical power to converge the light beam and compress the beam aperture, thereby reducing the longitudinal volume of the lens and facilitating miniaturization. Furthermore, the concave-convex or biconvex structure gently deflects the light, effectively correcting system field curvature and spherical aberration, which helps improve lens resolution and reduce system tolerance sensitivity.

[0047] In an exemplary embodiment, the eighth lens L8 may have negative optical power, and its object-side surface may be concave, while its image-side surface may be concave or flat. This configuration allows the negative optical power to diverge the light beam, effectively compensating for residual spherical aberration and chromatic aberration in the system. Simultaneously, the concave object-side surface smoothly diffuses edge rays, effectively suppressing coma and distortion, thus facilitating the simultaneous fulfillment of high resolution and low distortion requirements.

[0048] However, those skilled in the art should understand that, since the radius of curvature of the image side of the eighth lens L8 is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, which usually has little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0049] In an exemplary embodiment, the ninth lens L9 can have negative optical power, with both its object-side and image-side surfaces being concave. This configuration effectively balances the system's optical power and suppresses second-order chromatic aberration. Simultaneously, the double-concave structure uniformly diffuses light and effectively corrects system field curvature and distortion. This allows the lens to meet high resolution and low distortion requirements while reducing tolerance sensitivity and improving production yield.

[0050] In an exemplary embodiment, the second moving lens group of the zoom lens is G3 positive optical power. During the zoom process, the second moving lens group G3 moves along the optical axis from the object side to the image side, which can realize continuous zoom of the lens from the wide-angle end to the telephoto end, which is beneficial to improving the zoom ratio of the lens.

[0051] In an exemplary embodiment, the second movable lens group G3 includes only six lenses, which are sequentially arranged from the object side to the image side along the optical axis, including the tenth lens L11 and the eleventh lens group B11. The eleventh lens group B11 is composed of lens B11-1, lens B11-2, lens B13-3, lens B11-4, and lens B11-5 along the object side to the image side.

[0052] In an exemplary embodiment, the tenth lens L10 may have positive optical power, and its object-side surface may be convex, while its image-side surface may be convex, concave, or flat. This configuration allows the positive optical power to narrow the light beam, effectively reducing the incident angle of light from rear elements and enabling a smooth transition of light between optical systems, thus reducing the lens's tolerance sensitivity. The convex object-side surface smoothly gathers edge field-of-view light rays, reducing the amount of light deflection at the image-side surface, thereby suppressing coma and improving the lens's resolving power.

[0053] In an exemplary embodiment, the B11-1 lens can have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the negative optical power to diverge the light beam, effectively reducing focus drift under high and low temperature environments, which is beneficial for achieving a heat-free effect in the lens. Furthermore, the convex and concave shape effectively corrects residual aberrations in the system, thus improving the lens's imaging quality.

[0054] In an exemplary embodiment, the B11-2 lens can have positive optical power, and its object-side surface can be convex, as can its image-side surface. This configuration allows the positive optical power to converge the light beam, and the biconvex shape effectively reduces edge aberrations in the system, thus improving lens resolving power.

[0055] In an exemplary embodiment, the B11-3 lens can have negative optical power, with both its object-side and image-side surfaces being concave. This configuration allows the negative optical power to diverge the light beam, effectively suppressing system distortion and helping the lens meet low distortion requirements. Simultaneously, the double-concave shape reduces processing and assembly eccentricity sensitivity, thus improving lens production yield.

[0056] In an exemplary embodiment, the B11-4 lens can have positive optical power, and its object-side surface can be convex, as can its image-side surface. This configuration allows the positive optical power to converge the light beam, and the convex object-side surface can smoothly receive the edge beams of the system, reducing edge aberrations and improving the lens's imaging quality.

[0057] In an exemplary embodiment, the B11-5 lens can have negative optical power, with its object-side surface being concave and its image-side surface being convex or flat. This configuration allows the negative optical power to diverge the light beam, effectively reducing aberrations at the system's edge field of view and ensuring high resolution at the lens's edge. The concave object-side surface effectively reduces beam deflection, thus minimizing lens assembly misalignment sensitivity.

[0058] However, those skilled in the art should understand that, since the image-side radius of curvature of the B11-5 lens is relatively large, the convex, flat, and concave surfaces are easily interchangeable or fine-tuned, which usually has little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0059] In an exemplary embodiment, the eleventh lens group B11 can have positive optical power. This configuration, which results in a smaller optical power, reduces the degree of light deflection, allows for a smoother transition of light between optical systems, and helps to reduce the system's tolerance sensitivity.

[0060] In an exemplary embodiment, the second movable lens group G3 includes only five lenses, which are sequentially arranged from the object side to the image side along the optical axis, including the tenth lens L10 and the eleventh lens group B11. The eleventh lens group B11 is composed of lens B11-1, lens B11-2, lens B13-3 and lens B11-4 in sequence from the object side to the image side.

[0061] In an exemplary embodiment, the tenth lens L10 may have positive optical power, and its object-side surface may be convex, as may its image-side surface. This configuration allows the positive optical power to narrow the light beam, effectively reducing the incident angle of light from rear elements and enabling a smooth transition of light between optical systems, thus reducing the lens's tolerance sensitivity. The convex object-side surface smoothly gathers edge field-of-view light, reducing the amount of light deflection at the image-side surface, thereby suppressing coma and improving the lens's resolving power.

[0062] In an exemplary embodiment, the B11-1 lens can have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the negative optical power to diverge the light beam, effectively reducing focus drift under high and low temperature environments, which is beneficial for achieving a heat-free effect in the lens. Furthermore, the convex and concave shape effectively corrects residual aberrations in the system, thus improving the lens's imaging quality.

[0063] In an exemplary embodiment, the B11-2 lens can have positive optical power, and its object-side surface can be convex, as can its image-side surface. This configuration allows the positive optical power to converge the light beam, and the biconvex shape effectively reduces edge aberrations in the system, thus improving lens resolving power.

[0064] In an exemplary embodiment, the B11-3 lens can have negative optical power, with both its object-side and image-side surfaces being concave. This configuration allows the negative optical power to diverge the light beam, effectively suppressing system distortion and helping the lens meet low distortion requirements. Simultaneously, the double-concave shape reduces processing and assembly eccentricity sensitivity, thus improving lens production yield.

[0065] In an exemplary embodiment, the B11-4 lens can have positive optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the positive optical power to converge the light beam, and the convex object-side surface can smoothly receive the edge beams of the system, reducing edge aberrations and improving the lens's imaging quality.

[0066] In an exemplary embodiment, the B11-4 lens can have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the negative optical power to diverge the light beam, and the convex object-side surface acts as a transition buffer for the beam at the edge of a large target surface, which is beneficial for the lens to meet the requirements of a large target surface.

[0067] In an exemplary embodiment, the eleventh lens group B11 can have positive optical power. This configuration, which results in a smaller optical power, reduces the degree of light deflection, allows for a smoother transition of light between optical systems, and helps to reduce the system's tolerance sensitivity.

[0068] In an exemplary embodiment, the second fixed lens group G4 of the zoom lens has a negative optical power. During the zoom process, the second fixed lens group G4 is fixedly set so that the light transitions smoothly between optical systems, which helps to reduce the tolerance sensitivity of the system.

[0069] In an exemplary embodiment, the second fixed lens group G4 includes only seven lenses, which are sequentially arranged along the optical axis from the object side to the image side as the twelfth lens L12, the thirteenth lens group B13, the fourteenth lens L14, the fifteenth lens L15, and the sixteenth lens L16. The thirteenth lens group B13 is composed of lens B13-1, lens B13-2, and lens B13-3 along the object side to the image side.

[0070] In an exemplary embodiment, the twelfth lens L12 can have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the negative optical power to diverge the light beam, effectively reducing focus drift under high and low temperature environments, which is beneficial for achieving a heat-free effect in the lens. Furthermore, the convex and concave shape can effectively correct residual aberrations in the system, thus improving the lens's imaging quality.

[0071] In an exemplary embodiment, the B13-1 lens can have positive optical power, with its object-side surface being convex and its image-side surface being either convex or concave. This configuration allows the positive optical power to converge the light beam, equalize the light energy distribution across the large target surface, and reduce the resolution difference between the center and the edges, thus contributing to uniform lens image quality. Furthermore, the convex object-side surface can smoothly receive large-angle edge beams, effectively suppressing coma and enabling the lens to meet both the requirements of a large target surface and high-quality imaging.

[0072] In an exemplary embodiment, the B13-1 lens can have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the negative optical power to diverge the light beam, effectively widening the beam coverage area and facilitating large target area imaging. The convex object-side surface smoothly receives large-angle edge beams, effectively suppressing coma and enabling the lens to meet both large target area requirements and high-quality imaging.

[0073] In an exemplary embodiment, the B13-2 lens can have negative optical power, with both its object-side and image-side surfaces being concave. This configuration allows the negative optical power to diverge the light beam, compensating for the high and low temperature focus drift caused by the front lens element, thus improving the lens's imaging stability over a wide temperature range.

[0074] In an exemplary embodiment, the B13-2 lens can have positive optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the positive optical power to converge the light beam, effectively smoothing the light path and helping to reduce the system's tolerance sensitivity.

[0075] In an exemplary embodiment, the B13-3 lens can have positive optical power, with both its object-side and image-side surfaces being convex. This configuration allows the positive optical power to converge the light beam, and the biconvex shape effectively corrects system field curvature and distortion, enabling the lens to achieve high resolution while also meeting low distortion requirements.

[0076] In an exemplary embodiment, the B13-3 lens can have negative optical power, with both its object-side and image-side surfaces being concave. This configuration allows the negative optical power to diverge the light beam, and the biconcave shape effectively widens the beam coverage, which is beneficial for the lens to meet the imaging requirements of large target surfaces.

[0077] In an exemplary embodiment, the thirteenth lens group B13 can have positive or negative optical power. This configuration can effectively correct various aberrations in the system, while widening the beam coverage and compensating for high and low temperatures in the system. This is beneficial for the lens to simultaneously meet the requirements of high resolution, large target area, and no defocusing at high and low temperatures.

[0078] In an exemplary embodiment, the fourteenth lens L14 can have negative optical power, and its object-side surface can be convex or concave, while its image-side surface can be concave. This configuration allows the negative optical power to diverge light, effectively widening the beam coverage area and helping the lens meet the imaging requirements of large target surfaces.

[0079] In an exemplary embodiment, the fourteenth lens L14 may have positive optical power, and its object-side surface may be convex, as may its image-side surface. This configuration allows the positive optical power to converge the light beam, and the convex object-side surface can smoothly receive the edge beams of the system, reducing edge aberrations and improving the lens's imaging quality.

[0080] In an exemplary embodiment, the fifteenth lens L15 can have positive optical power, and its object-side surface can be convex or flat, while its image-side surface can be convex. This configuration allows the positive optical power to converge the light beam, and setting the image-side surface to convex helps to gently converge the beam, effectively reducing distortion in a large field of view and helping the lens meet low distortion requirements.

[0081] However, those skilled in the art should understand that, since the radius of curvature of the object side of the fifteenth lens L15 is relatively large, the convex, flat and concave surfaces are easy to change or fine-tune with each other, and usually have little impact on the overall technical effect of the optical system. It is obvious to those skilled in the art that using a large radius of curvature as the optimization boundary condition for this surface does not require any creative effort.

[0082] In an exemplary embodiment, the sixteenth lens L16 can have negative optical power, and its object-side surface can be concave, as can its image-side surface. This configuration allows the negative optical power to diverge the light beam, alleviating the light deflection pressure at the edge of the large target surface. Simultaneously, the double-concave structure weakens the impact of assembly eccentricity errors, which helps reduce the system's tolerance sensitivity and improve production yield.

[0083] In an exemplary embodiment, the second fixed lens group G4 includes only six lenses, which are sequentially arranged along the optical axis from the object side to the image side as the twelfth lens L12, the thirteenth lens group B13, the fourteenth lens L14, the fifteenth lens L15, and the sixteenth lens L16. The thirteenth lens group B13 is composed of lens B13-1 and lens B13-2 along the object side to the image side.

[0084] In an exemplary embodiment, the twelfth lens L12 can have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the negative optical power to diverge the light beam, effectively reducing focus drift under high and low temperature environments, which is beneficial for achieving a heat-free effect in the lens. Furthermore, the convex and concave shape can effectively correct residual aberrations in the system, thus improving the lens's imaging quality.

[0085] In an exemplary embodiment, the B13-1 lens can have negative optical power, with its object-side surface being convex and its image-side surface being concave. This configuration allows the negative optical power to diverge the light beam, effectively widening the beam coverage area and facilitating large target area imaging. The convex object-side surface smoothly receives large-angle edge beams, effectively suppressing coma and enabling the lens to meet both large target area requirements and high-quality imaging.

[0086] In an exemplary embodiment, the B13-2 lens can have positive optical power, and its object-side surface can be convex, as can its image-side surface. This configuration allows the negative optical power to diverge the light beam, compensating for the focus drift caused by the high and low temperature effects of the front lens element, thus improving the lens's imaging stability over a wide temperature range.

[0087] In an exemplary embodiment, the thirteenth lens group B13 can have positive optical power. This configuration can effectively correct various aberrations in the system, while widening the beam coverage and compensating for high and low temperatures in the system. This is beneficial for the lens to simultaneously meet the requirements of high resolution, large target area, and no defocusing at high and low temperatures.

[0088] In an exemplary embodiment, the fourteenth lens L14 can have negative optical power, and its object-side surface can be concave, as can its image-side surface. This configuration allows the negative optical power to diverge light, effectively widening the beam coverage area and helping the lens meet the imaging requirements of large target surfaces.

[0089] In an exemplary embodiment, the fifteenth lens L15 can have positive optical power, and its object-side surface can be convex, as can its image-side surface. This configuration allows the positive optical power to converge the light beam, while setting the image-side surface to a convex surface can gently converge the beam, effectively reducing distortion in a large field of view and helping the lens meet low distortion requirements.

[0090] In an exemplary embodiment, the sixteenth lens L16 can have negative optical power, and its object-side surface can be concave, as can its image-side surface. This configuration allows the negative optical power to diverge the light beam, alleviating the light deflection pressure at the edge of the large target surface. Simultaneously, the double-concave structure weakens the impact of assembly eccentricity errors, which helps reduce the system's tolerance sensitivity and improve production yield.

[0091] In an exemplary embodiment, the third moving lens group G5 of the zoom lens is positive optical power. During the zoom process, the third moving lens group G5 moves along the optical axis from the object side to the image side for focusing (or compensation). It mainly undertakes the function of image plane compensation and can compensate the image plane during the continuous zoom of the lens, thereby ensuring the imaging quality of the lens body during continuous zoom.

[0092] In an exemplary embodiment, the third movable lens group G5 includes only three lenses, which are sequentially arranged along the optical axis from the object side to the image side as the seventeenth lens L17, the eighteenth lens L18, and the nineteenth lens L19.

[0093] In an exemplary embodiment, the seventeenth lens L17 can have positive or negative optical power, and its object-side surface can be convex, while its image-side surface can be concave. This configuration, with its convex and concave shape, can reduce light refraction, effectively correct various aberrations in the system, and improve the lens's resolving power.

[0094] In an exemplary embodiment, the eighteenth lens L18 can have negative or positive optical power, and its object-side surface can be convex, while its image-side surface can be convex or concave. This configuration, with the object-side surface being convex, effectively reduces the incident angle of edge rays, thereby suppressing distortion and helping to meet low distortion requirements.

[0095] In an exemplary embodiment, the seventeenth lens L17 and the eighteenth lens L18 have opposite positive and negative optical powers. This arrangement effectively reduces the degree of light deflection, which helps to reduce the tolerance sensitivity of the system; at the same time, they compensate for focus drift at high and low temperatures, which helps the lens meet the requirements of heatless operation.

[0096] In an exemplary embodiment, the nineteenth lens L19 can have positive optical power, and its object-side surface can be convex or concave, while its image-side surface can be convex. This configuration allows the positive optical power to converge the light beam, effectively balancing the high and low temperatures of the system, which is beneficial for achieving the lens's heat-free requirements. Setting the image-side surface to convex allows the light to transition smoothly to the image plane, while effectively correcting residual aberrations on large target surfaces, enabling the lens to meet the requirements of large target surfaces while also having low tolerance sensitivity.

[0097] In an exemplary embodiment, the zoom lens may further include an aperture stop STO. The aperture stop STO may be located between the second moving lens group G3 and the second fixed lens group G4, which can effectively limit the amount of light entering the optical system, shorten the total optical length of the zoom lens, reduce the maximum optical aperture of the zoom lens, and facilitate the miniaturization of the zoom lens.

[0098] In an exemplary embodiment, the zoom lens can satisfy: 2.201 ≤ FG1 / FW ≤ 3.007, where FG1 is the effective focal length of the first fixed lens group, and Fw is the effective focal length at the wide-angle end of the zoom lens. This configuration allows light to converge smoothly into the optical system, effectively correcting various aberrations at the telephoto end while reducing distortion throughout the optical system, thus facilitating the simultaneous fulfillment of the lens's requirements for high resolution and low distortion. Preferably, the zoom lens can further satisfy: 2.446 ≤ FG1 / FW ≤ 2.734.

[0099] In an exemplary embodiment, the zoom lens can satisfy: -0.964 ≤ FG2 / FW ≤ -0.716, where FG2 is the effective focal length value of the first moving lens group, and Fw is the effective focal length value at the wide-angle end of the zoom lens. This setting is beneficial for achieving imaging performance while ensuring the required zoom ratio during zooming. Preferably, the zoom lens can further satisfy: -0.876 ≤ FG2 / FW ≤ -0.796.

[0100] In an exemplary embodiment, the zoom lens can satisfy: 0.653 ≤ FG3 / FW ≤ 1.141, where FG3 is the effective focal length value of the second moving lens group, and Fw is the effective focal length value at the wide-angle end of the zoom lens. This setting is beneficial for achieving imaging performance while ensuring the required zoom ratio during zooming. Preferably, the zoom lens can further satisfy: 0.725 ≤ FG3 / FW ≤ 1.037.

[0101] In an exemplary embodiment, the zoom lens can satisfy: -1.229 ≤ FG4 / FW ≤ -0.761, where FG4 is the effective focal length value of the second fixed lens group, and Fw is the effective focal length value at the wide-angle end of the zoom lens. This setting effectively reduces light deflection, allowing light to transition smoothly between optical systems, which helps reduce lens tolerance sensitivity. Preferably, the zoom lens can further satisfy: -1.117 ≤ FG4 / FW ≤ -0.846.

[0102] In an exemplary embodiment, the zoom lens can satisfy: 0.903 ≤ FG5 / FW ≤ 1.434, where FG5 is the effective focal length value of the third moving lens group, and Fw is the effective focal length value at the wide-angle end of the zoom lens. This setting effectively compensates for the shift in image plane position during zooming, effectively focusing the image plane and improving the focusing speed of the lens during zooming. Preferably, the zoom lens can further satisfy: 1.003 ≤ FG5 / FW ≤ 1.304.

[0103] In an exemplary embodiment, the zoom lens can satisfy: 1.049 ≤ F1 / FG1 ≤ 1.360, where F1 is the effective focal length of the first lens and FG1 is the effective focal length of the first fixed lens group. This configuration quickly converges the incident light beam and compresses subsequent light beams to bring them closer to the optical axis, which helps to shorten the overall system length and allows the lens to meet miniaturization requirements. Preferably, the zoom lens can further satisfy: 1.165 ≤ F1 / FG1 ≤ 1.236.

[0104] In an exemplary embodiment, the zoom lens can satisfy: -2.290 ≤ F2 / FG1 ≤ -1.152, where F2 is the effective focal length of the second lens and FG1 is the effective focal length of the first fixed lens group. This setting cancels out the spherical aberration caused by the front positive lens, which is beneficial to improving the image quality of the lens. Preferably, the zoom lens can further satisfy: -2.082 ≤ F2 / FG1 ≤ -1.280.

[0105] In an exemplary embodiment, the zoom lens can satisfy: 0.663 ≤ F3 / FG1 ≤ 1.099, where F3 is the effective focal length of the third lens and FG1 is the effective focal length of the first fixed lens group. This setting, combined with aberration correction by the front lens group, helps improve the lens's image quality. Preferably, the zoom lens can further satisfy: 0.737 ≤ F3 / FG1 ≤ 0.999.

[0106] In an exemplary embodiment, the zoom lens can satisfy: -1.117≤F4 / FG1≤-0.461-, where F4 is the effective focal length of the fourth lens and FG1 is the effective focal length of the first fixed lens group. This setting optimizes the overall optical power distribution and diffuses the edge field of view, which is beneficial for achieving a large target surface effect. Preferably, the zoom lens can further satisfy: 1.015≤F4 / FG1≤-0.512.

[0107] In an exemplary embodiment, the zoom lens can satisfy: 0.678 ≤ F5 / FG1 ≤ 2.449, where F5 is the effective focal length of the fifth lens and FG1 is the effective focal length of the first fixed lens group. This setting effectively corrects system field curvature, reduces spherical aberration increment, minimizes aberration fluctuations during zooming, and improves lens resolving power. Preferably, the zoom lens can further satisfy: 0.753 ≤ F5 / FG1 ≤ 2.226.

[0108] In an exemplary embodiment, the zoom lens can satisfy: 1.222 ≤ F6 / FG2 ≤ 2.802, where F6 is the effective focal length of the sixth lens and FG2 is the effective focal length of the first moving lens group. This setting balances the system's optical power, eliminates residual chromatic aberration and spherical aberration in the preceding optical system, and helps improve the lens's resolving power. Preferably, the zoom lens can further satisfy: 1.358 ≤ F6 / FG2 ≤ 2.547.

[0109] In an exemplary embodiment, the zoom lens can satisfy: -2.648 ≤ F7 / FG2 ≤ -0.831, where F7 is the effective focal length of the seventh lens and FG2 is the effective focal length of the first moving lens group. This configuration converges the light beam and compresses the beam aperture, thereby reducing the longitudinal volume of the lens and facilitating miniaturization. Preferably, the zoom lens can further satisfy: -2.407 ≤ F7 / FG2 ≤ -0.923.

[0110] In an exemplary embodiment, the zoom lens can satisfy: 0.990 ≤ F8 / FG2 ≤ 2.542, where F8 is the effective focal length of the eighth lens and FG2 is the effective focal length of the first moving lens group. This setting smoothly diffuses edge light, effectively compensating for residual spherical aberration and chromatic aberration, suppressing coma and distortion, and facilitating the simultaneous satisfaction of high resolution and low distortion requirements. Preferably, the zoom lens can further satisfy: 1.100 ≤ F8 / FG2 ≤ 2.311.

[0111] In an exemplary embodiment, the zoom lens can satisfy: 1.288 ≤ F9 / FG2 ≤ 2.382, where F9 is the effective focal length of the ninth lens and FG2 is the effective focal length of the first moving lens group. This setting effectively balances the system's optical power and suppresses the generation of second-order chromatic aberration, which is beneficial for improving the lens's resolving power. Preferably, the zoom lens can further satisfy: 1.431 ≤ F9 / FG2 ≤ 2.165.

[0112] In an exemplary embodiment, the zoom lens can satisfy: 1.002 ≤ F10 / FG3 ≤ 1.760, where F10 is the effective focal length of the tenth lens and FG3 is the effective focal length of the second moving lens group. This setting effectively reduces the incident angle of light from the rear elements, allowing for a smoother transition of light between optical systems, which helps reduce the tolerance sensitivity of the lens. Preferably, the zoom lens can further satisfy: 1.113 ≤ F10 / FG3 ≤ 1.600.

[0113] In an exemplary embodiment, the zoom lens can satisfy: 2.606 ≤ FB11 / FG3 ≤ 20.404, where FB11 is the effective focal length of the eleventh lens group and FG3 is the effective focal length of the second moving lens group. This configuration reduces the degree of light refraction, allowing for a smoother transition of light between optical systems, which helps reduce the system's tolerance sensitivity. Preferably, the zoom lens can further satisfy: 2.896 ≤ FB11 / FG3 ≤ 18.549.

[0114] In an exemplary embodiment, the zoom lens can satisfy: 1.031 ≤ F12 / FG4 ≤ 5.944, where F12 is the effective focal length of the twelfth lens and FG4 is the effective focal length of the second fixed lens group. This setting effectively reduces focus drift under high and low temperature environments, which is beneficial for achieving a heat-free effect in the lens. Preferably, the zoom lens can further satisfy: 1.146 ≤ F12 / FG4 ≤ 5.404.

[0115] In an exemplary embodiment, the zoom lens can satisfy: -1.382≤FB13 / FG4≤0.793, where FB13 is the effective focal length value of the thirteenth lens group and FG4 is the effective focal length value of the second fixed lens group. This configuration effectively corrects various aberrations in the system, while widening the beam coverage and compensating for high and low temperatures, thus helping the lens simultaneously meet the requirements of high resolution, large target area, and no defocusing at high and low temperatures. Preferably, the zoom lens can further satisfy: -1.256≤FB13 / FG4≤0.721.

[0116] In an exemplary embodiment, the zoom lens can satisfy: -0.523 ≤ F14 / FG4 ≤ 1.456, where F14 is the effective focal length of the fourteenth lens and FG4 is the effective focal length of the second fixed lens group. This setting effectively widens the beam coverage, which is beneficial for the lens to meet the imaging requirements of large target surfaces; at the same time, it smooths out the light path, which helps reduce the tolerance sensitivity of the system. Preferably, the zoom lens can further satisfy: -0.475 ≤ F14 / FG4 ≤ 1.324.

[0117] In an exemplary embodiment, the zoom lens can satisfy: -1.882 ≤ F15 / FG4 ≤ -0.325, where F15 is the effective focal length of the fifteenth lens and FG4 is the effective focal length of the second fixed lens group. This configuration smoothly converges the light beam, effectively reducing distortion in a wide field of view, which is beneficial for the lens to meet low distortion requirements. Preferably, the zoom lens can further satisfy: -1.711 ≤ F15 / FG4 ≤ -0.361.

[0118] In an exemplary embodiment, the zoom lens can satisfy: 0.365 ≤ F16 / FG4 ≤ 0.674, where F16 is the effective focal length of the sixteenth lens and FG4 is the effective focal length of the second fixed lens group. This configuration alleviates the light refraction pressure at the edge of the large target surface, weakens the impact of assembly eccentricity errors, and helps reduce the system's tolerance sensitivity, thereby improving production yield. Preferably, the zoom lens can further satisfy: 0.406 ≤ F16 / FG4 ≤ 0.613.

[0119] In an exemplary embodiment, the zoom lens can satisfy: -3.477≤F17 / FG5≤1.854, where F17 is the effective focal length of the seventeenth lens and FG5 is the effective focal length of the third moving lens group. This setting reduces light refraction, effectively correcting various aberrations in the system and improving lens resolution. Preferably, the zoom lens can further satisfy: -3.161≤F17 / FG5≤1.685.

[0120] In an exemplary embodiment, the zoom lens can satisfy: -2.132 ≤ F18 / FG5 ≤ 1.045, where F18 is the effective focal length of the eighteenth lens and FG5 is the effective focal length of the third moving lens group. This setting effectively reduces the incident angle of edge light, thereby suppressing distortion and helping to meet low distortion requirements. Preferably, the zoom lens can further satisfy: -1.938 ≤ F18 / FG5 ≤ 0.950.

[0121] In an exemplary embodiment, the zoom lens can satisfy: 0.804 ≤ F19 / FG5 ≤ 3.003, where F19 is the effective focal length of the nineteenth lens and FG5 is the effective focal length of the third moving lens group. This setting effectively balances the high and low temperatures of the system, which is beneficial for the lens to achieve the requirement of no pyrolysis; at the same time, it allows the light to transition smoothly to the image plane, effectively correcting residual aberrations on large target surfaces, which is beneficial for the lens to meet the requirements of large target surfaces while also having low tolerance sensitivity. Preferably, the zoom lens can further satisfy: 0.893 ≤ F19 / FG5 ≤ 2.730.

[0122] In an exemplary embodiment, the zoom lens can satisfy: 6.512 ≤ TTL / H ≤ 8.401, where TTL is the total optical length of the zoom lens and H is the full-image height of the zoom lens. This configuration, while meeting the requirements for a large target area, controls the total optical length of the system, thereby achieving miniaturization. Preferably, the zoom lens can further satisfy: 7.235 ≤ TTL / H ≤ 7.637.

[0123] In an exemplary embodiment, the zoom lens can satisfy: 3.240≤TTL / FW≤4.180, where TTL is the total optical length of the zoom lens, and Fw is the effective focal length at the wide-angle end of the zoom lens. This setting, while controlling the focal length at the wide-angle end, shortens the total optical length, achieving a compact lens design and facilitating lens miniaturization. Preferably, the zoom lens can further satisfy: 3.600≤TTL / FW≤3.800.

[0124] In an exemplary embodiment, the zoom lens can satisfy: 0.900≤TTL / FT≤1.162, where TTL is the total optical length of the zoom lens, and FT is the effective focal length at the telephoto end of the zoom lens. This setting, by shortening the total optical length of the lens while increasing the focal length at the telephoto end, helps the lens simultaneously meet the requirements of miniaturization and telephoto capabilities. Preferably, the zoom lens can further satisfy: 1.000≤TTL / FT≤1.056.

[0125] In an exemplary embodiment, the total optical length (TTL) of the zoom lens of this application can satisfy: TTL≤290mm, and further, TTL can satisfy: 269mm≤TTL≤286mm, thereby achieving the requirement of small size for the zoom lens.

[0126] In an exemplary embodiment, the zoom lens of this application has a focal length range of 75mm to 270mm and a zoom ratio of 3.6x, so that the zoom lens can simultaneously meet the requirements of long focal length and large zoom ratio.

[0127] In an exemplary embodiment, the zoom lens holographic height (IH) of this application can meet the following requirement: IH≥37.32mm, which can be matched with chips of 5 / 3 inches or larger.

[0128] In an exemplary embodiment, the absolute value of the distortion DIS of the zoom lens of this application can satisfy: |DIS|≤3.3%, thereby achieving the low distortion requirement for the zoom lens.

[0129] In an exemplary embodiment, the zoom lens of this application is suitable for use in various temperature environments, and can further achieve non-defocusing during high and low temperature processes from -40℃ to +80℃.

[0130] In an exemplary embodiment, this application sets all lenses as glass spherical surfaces, which helps reduce the manufacturing difficulty of the lenses. Glass lenses can effectively suppress the shift in the back focal length of the zoom lens caused by temperature changes, improving the stability of the zoom lens; at the same time, glass lenses can effectively avoid the problem of image blurring caused by high or low temperature environments, ensuring the normal use of the zoom lens, which is conducive to achieving heatless zoom lens, and also better corrects system chromatic aberration, improving the resolving power of the zoom lens.

[0131] According to the above-described embodiments of this application, the zoom lens sequentially comprises a first fixed lens group, a first movable lens group, a second movable lens group, a second fixed lens group, and a third movable lens group along the optical axis from the object side to the image side. During zooming, the first fixed lens group and the second fixed lens group are fixedly disposed, while the first movable lens group and the second movable lens group move along the optical axis between the object side and the image side to achieve continuous zooming between the wide-angle end and the telephoto end. The third movable lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming. Furthermore, by rationally allocating the number of lenses in each lens group, the optical power of the lenses, and optical parameters such as surface shape, at least one beneficial effect can be achieved, including a large target surface (5 / 3″), low distortion (DIS absolute value ≤ 3.3%), high resolution, and no defocusing during high and low temperature processes from -40℃ to +80℃.

[0132] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the zoom lens can be changed to obtain the various results and advantages described in this specification.

[0133] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the zoom lens applicable to the above-described embodiments.

[0134] Example 1

[0135] The following is for reference Figure 1 A zoom lens according to Embodiment 1 of this application is described. Figure 1 A schematic diagram of the zoom lens according to Embodiment 1 of this application is shown when it is at the wide-angle end, the middle end, and the telephoto end.

[0136] like Figure 1 As shown, the zoom lens includes, along the optical axis from the object side to the image side, a first fixed lens group G1 and a second fixed lens group G4 that are fixedly set during the zoom process, a first movable lens group G2 and a second movable lens group G3 that move along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle end and the telephoto end, and a third movable lens group G5 that moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during the zoom process.

[0137] Table 1 shows the optical power, number of lenses, optical power of each lens, and shape of each lens in the first fixed lens group G1, the first movable lens group G2, the second movable lens group G3, the second fixed lens group G4, and the third movable lens group G5; the aperture stop STO is disposed between the second movable lens group G3 and the second fixed lens group G4; the zoom lens also includes a filter and a chip protective glass CG disposed on the image side of the third movable lens group G5, which has an object side side and an image side side; light from the object side passes through each surface in sequence and is finally imaged on the imaging surface IMA.

[0138] Table 1 shows the basic parameters of the zoom lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0139] Table 1

[0140] In Example 1, distance T1 in Table 1 represents the air gap on the optical axis between the first fixed lens group G1 and the first movable lens group G2 when the zoom lens is at the wide-angle end, the intermediate end, and the telephoto end; distance T2 in Table 1 represents the air gap on the optical axis between the first movable lens group G2 and the second movable lens group G3 when the zoom lens is at the wide-angle end, the intermediate end, and the telephoto end; distance T3 in Table 1 represents the air gap on the optical axis between the second movable lens group G3 and the aperture stop STO when the zoom lens is at the wide-angle end, the intermediate end, and the telephoto end; distance T4 in Table 1 represents the air gap on the optical axis between the second fixed lens group G4 and the third movable lens group G5 when the zoom lens is at the wide-angle end, the intermediate end, and the telephoto end; and distance T5 in Table 1 represents the air gap on the optical axis between the third movable lens group G5 and the protective glass CG when the zoom lens is at the wide-angle end, the intermediate end, and the telephoto end. The values ​​(in mm) of the variables T1, T2, T3, T4 and T5 mentioned above when the lens is at the wide-angle end, the middle end and the telephoto end are respectively shown in Table 2 below.

[0141] Table 2

[0142] Wide-angle end middle end Observation Depth T1 5.044 51.655 67.296 T2 92.050 36.190 3.595 T3 2.600 11.848 28.804 T4 8.351 8.500 29.282 T5 41.623 41.475 20.693 focal length 75.00 165.00 270.00 aperture 3.00 3.45 3.54 Overall optical length 285.001 285.001 285.001 Like Gao 37.32 37.32 37.32 distortion -3.10% 1.49% 2.57% Comparison 54.30% 57.23% 49.03% Center MTF value 172 lp / mm 0.459 0.560 0.407

[0143] Example 2

[0144] The following is for reference Figure 2 Description of a zoom lens according to Embodiment 2 of this application. Figure 2 A schematic diagram of the zoom lens according to Embodiment 2 of this application is shown when it is at the wide-angle end, the middle end, and the telephoto end.

[0145] like Figure 2As shown, the zoom lens includes, along the optical axis from the object side to the image side, a first fixed lens group G1 and a second fixed lens group G4 that are fixedly set during the zoom process, a first movable lens group G2 and a second movable lens group G3 that move along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle end and the telephoto end, and a third movable lens group G5 that moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during the zoom process.

[0146] Table 3 shows the optical power, number of lenses, optical power of each lens, and shape of each lens in the first fixed lens group G1, the first movable lens group G2, the second movable lens group G3, the second fixed lens group G4, and the third movable lens group G5; the aperture stop STO is disposed between the second movable lens group G3 and the second fixed lens group G4; the zoom lens also includes a filter and a chip protective glass CG disposed on the image side of the third movable lens group G5, which has an object side side and an image side side; light from the object side passes through each surface in sequence and is finally imaged on the imaging surface IMA.

[0147] Table 3 shows the basic parameters of the zoom lens in Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0148] Table 3

[0149] In Example 2, the meanings of variables T1, T2, T3, T4, and T5 in Table 3 are the same as in Example 1. The values ​​(in mm) of the above variables T1, T2, T3, T4, and T5 when the lens is at the wide-angle end, the middle end, and the telephoto end are shown in Table 4 below.

[0150] Table 4

[0151] Wide-angle end middle end Observation Depth T1 5.508 48.409 62.098 T2 82.803 31.393 3.267 T3 2.600 11.109 25.546 T4 8.408 6.816 25.206 T5 30.584 32.176 13.786 focal length 75.00 165.00 270.00 aperture 3.00 3.45 3.53 Overall optical length 282.000 282.000 282.000 Like Gao 37.32 37.32 37.32 distortion -3.30% 1.19% 2.56% Comparison 69.86% 66.13% 54.29% Center MTF value 172 lp / mm 0.423 0.558 0.390

[0152] Example 3

[0153] The following is for reference Figure 3 Description of a zoom lens according to Embodiment 3 of this application. Figure 3 A schematic diagram of the zoom lens according to Embodiment 3 of this application is shown when it is at the wide-angle end, the middle end, and the telephoto end.

[0154] like Figure 3 As shown, the zoom lens includes, along the optical axis from the object side to the image side, a first fixed lens group G1 and a second fixed lens group G4 that are fixedly set during the zoom process, a first movable lens group G2 and a second movable lens group G3 that move along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle end and the telephoto end, and a third movable lens group G5 that moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during the zoom process.

[0155] Table 5 shows the optical power, number of lenses, optical power of each lens, and shape of each lens in the first fixed lens group G1, the first movable lens group G2, the second movable lens group G3, the second fixed lens group G4, and the third movable lens group G5; the aperture stop STO is disposed between the second movable lens group G3 and the second fixed lens group G4; the zoom lens also includes a filter and a chip protective glass CG disposed on the image side of the third movable lens group G5, which has an object side side and an image side side; light from the object side passes through each surface in sequence and is finally imaged on the imaging surface IMA.

[0156] Table 5 shows the basic parameters of the zoom lens in Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0157] Table 5

[0158] In Example 3, the meanings of variables T1, T2, T3, T4, and T5 in Table 5 are the same as in Example 1. The values ​​(in mm) of the above variables T1, T2, T3, T4, and T5 when the lens is at the wide-angle end, the middle section, and the telephoto end are shown in Table 6 below.

[0159] Table 6

[0160] Wide-angle end middle end Observation Depth T1 5.098 51.437 66.906 T2 92.759 36.757 3.455 T3 2.600 12.263 30.096 T4 8.246 8.776 29.569 T5 42.416 41.886 21.093 focal length 75.00 165.00 270.00 aperture 3.00 3.45 3.54 Overall optical length 282.998 282.998 282.998 Like Gao 37.32 37.32 37.32 distortion -3.12% 1.54% 2.70% Comparison 62.13% 62.05% 47.88% Center MTF value 172 lp / mm 0.461 0.573 0.405

[0161] Example 4

[0162] The following is for reference Figure 4 The zoom lens according to Embodiment 4 of this application is described. Figure 4 A schematic diagram of the zoom lens according to Embodiment 4 of this application is shown when it is at the wide-angle end, the middle end, and the telephoto end.

[0163] like Figure 4 As shown, the zoom lens includes, along the optical axis from the object side to the image side, a first fixed lens group G1 and a second fixed lens group G4 that are fixedly set during the zoom process, a first movable lens group G2 and a second movable lens group G3 that move along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle end and the telephoto end, and a third movable lens group G5 that moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during the zoom process.

[0164] Table 7 shows the optical power, number of lenses, optical power of each lens, and shape of each lens in the first fixed lens group G1, the first movable lens group G2, the second movable lens group G3, the second fixed lens group G4, and the third movable lens group G5; the aperture stop STO is disposed between the second movable lens group G3 and the second fixed lens group G4; the zoom lens also includes a filter and a chip protective glass CG disposed on the image side of the third movable lens group G5, which has an object side side and an image side side; light from the object side passes through each surface in sequence and is finally imaged on the imaging surface IMA.

[0165] Table 7 shows the basic parameters of the zoom lens in Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0166] Table 7

[0167] In Example 4, the meanings of variables T1, T2, T3, T4, and T5 in Table 7 are the same as in Example 1. The values ​​(in mm) of the above variables T1, T2, T3, T4, and T5 when the lens is at the wide-angle end, the middle end, and the telephoto end are shown in Table 8 below.

[0168] Table 8

[0169] Wide-angle end middle end Observation Depth T1 4.877 45.759 65.475 T2 77.563 32.496 2.552 T3 2.643 6.828 17.056 T4 9.746 6.756 35.296 T5 25.849 28.839 0.299 focal length 75.00 150.00 270.00 aperture 3.00 3.50 4.00 Overall optical length 269.999 269.999 269.999 Like Gao 37.32 37.32 37.32 distortion -0.91% 2.63% 2.61% Comparison 51.69% 48.99% 51.90% Center MTF value 172 lp / mm 0.497 0.553 0.424

[0170] Example 5

[0171] The following is for reference Figure 5 The zoom lens according to Embodiment 5 of this application is described. Figure 5 A schematic diagram of the zoom lens according to Embodiment 5 of this application is shown when it is at the wide-angle end, the middle end, and the telephoto end.

[0172] like Figure 5 As shown, the zoom lens includes, along the optical axis from the object side to the image side, a first fixed lens group G1 and a second fixed lens group G4 that are fixedly set during the zoom process, a first movable lens group G2 and a second movable lens group G3 that move along the optical axis between the object side and the image side to achieve continuous zoom between the wide-angle end and the telephoto end, and a third movable lens group G5 that moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during the zoom process.

[0173] Table 9 shows the optical power, number of lenses, optical power of each lens, and shape of each lens in the first fixed lens group G1, the first movable lens group G2, the second movable lens group G3, the second fixed lens group G4, and the third movable lens group G5; the aperture stop STO is disposed between the second movable lens group G3 and the second fixed lens group G4; the zoom lens also includes a filter and a chip protective glass CG disposed on the image side of the third movable lens group G5, which has an object side side and an image side side; light from the object side passes through each surface in sequence and is finally imaged on the imaging surface IMA.

[0174] Table 9 shows the basic parameters of the zoom lens of Example 5, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0175] Table 9

[0176] In Example 5, the meanings of variables T1, T2, T3, T4, and T5 in Table 9 are the same as in Example 1. The values ​​(in mm) of the above variables T1, T2, T3, T4, and T5 when the lens is at the wide-angle end, the middle end, and the telephoto end are shown in Table 10 below.

[0177] Table 10

[0178] Wide-angle end middle end Observation Depth T1 1.800 41.871 55.708 T2 79.293 33.239 4.557 T3 4.800 10.783 25.628 T4 7.188 9.700 47.223 T5 40.635 38.123 0.600 focal length 75.00 150.00 270.00 aperture 3.00 3.50 4.00 Overall optical length 270.001 270.001 270.001 Like Gao 37.32 37.32 37.32 distortion -2.79% 1.34% 1.78% Comparison 42.84% 50.35% 46.88% Center MTF value 172 lp / mm 0.562 0.572 0.517

[0179] In summary, the conditional expressions in Examples 1 to 5 satisfy the relationships shown in Table 11. In Table 11, the unit for all parameters is millimeters (mm).

[0180] Table 11

[0181] Conditional / Example 1 2 3 4 5 FG1 / FW 2.560 2.446 2.534 2.734 2.489 FG2 / FW -0.875 -0.796 -0.876 -0.804 -0.840 FG3 / FW 1.015 0.922 1.037 0.725 0.784 FG4 / FW -1.094 -0.932 -1.117 -0.846 -0.997 FG5 / FW 1.074 1.003 1.067 1.220 1.304 F1 / FG1 1.200 1.171 1.236 1.203 1.165 F2 / FG1 -2.082 -1.280 -1.922 -1.703 -1.617 F3 / FG1 0.989 0.777 0.999 0.737 0.768 F4 / FG1 -0.782 -0.830 -0.859 -0.512 -1.015 F5 / FG1 1.093 1.195 1.140 0.753 2.226 F6 / FG2 2.462 1.901 2.547 1.358 1.369 F7 / FG2 -2.392 -1.788 -2.407 -0.923 -0.960 F8 / FG2 2.311 2.251 2.160 1.100 1.545 F9 / FG2 1.862 1.869 1.933 2.165 1.431 F10 / FG3 1.134 1.175 1.113 1.474 1.600 FB11 / FG3 13.533 7.856 18.549 3.332 2.896 F12 / FG4 1.832 5.181 5.404 2.066 1.146 FB13 / FG4 -0.693 -0.753 -0.719 0.721 -1.256 F14 / FG4 1.324 0.667 0.963 -0.475 0.578 F15 / FG4 -1.711 -1.227 -0.972 -1.563 -0.361 F16 / FG4 0.508 0.613 0.406 0.512 0.484 F17 / FG5 1.580 1.660 1.685 -3.161 -2.290 F18 / FG5 -1.357 -1.784 -1.938 0.950 0.892 F19 / FG5 0.893 1.000 1.065 2.730 2.306 TTL / H 7.637 7.556 7.583 7.235 7.235 TTL / FW 3.800 3.760 3.773 3.600 3.600 TTL / FT 1.056 1.044 1.048 1.000 1.000

[0182] This application also provides an imaging device, whose electronic photosensitive element may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS), and the imaging device is equipped with the zoom lens described above.

[0183] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zoom lens, characterized in that, Along the optical axis from the object side to the image side, in sequence: A first fixed lens group with positive optical power, the first fixed lens group comprising only five lenses, which are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens; A first movable lens group with negative optical power, the first movable lens group comprising only four lenses, namely a sixth lens, a seventh lens, an eighth lens and a ninth lens, in sequence from the object side to the image side; A second movable lens group with positive optical power, comprising only five or six lenses, wherein from the object side to the image side are a tenth lens and an eleventh lens group with positive optical power; when the second movable lens group comprises only five lenses, the eleventh lens group is composed of four lenses with negative optical power, positive optical power, negative optical power, and negative optical power, or four lenses with negative optical power, positive optical power, negative optical power, and positive optical power, from the object side to the image side; when the second movable lens group comprises only six lenses, the eleventh lens group is composed of five lenses with negative optical power, positive optical power, negative optical power, positive optical power, and negative optical power, from the object side to the image side. A second fixed lens group with negative optical power, comprising only six or seven lenses, arranged sequentially from the object side to the image side as a twelfth lens, a thirteenth lens group with positive or negative optical power, a fourteenth lens, a fifteenth lens, and a sixteenth lens; when the second fixed lens group comprises only six lenses, the thirteenth lens group consists of two lenses with negative and positive optical power arranged sequentially from the object side to the image side; when the second fixed lens group comprises only seven lenses, the thirteenth lens group consists of three lenses with positive, negative, and positive optical power, or three lenses with negative, positive, and negative optical power arranged sequentially from the object side to the image side. A third movable lens group with positive optical power, the third movable lens group comprising only three lenses, namely the seventeenth lens, the eighteenth lens and the nineteenth lens from the object side to the image side; The zoom lens has five lens groups with optical power. During zooming, the first fixed lens group and the second fixed lens group are fixedly set, and the first movable lens group and the second movable lens group move along the optical axis between the object side and the image side to achieve continuous zooming between the wide-angle end and the telephoto end. The third movable lens group moves along the optical axis between the object side and the image side to compensate for changes in the image plane position during zooming.

2. The zoom lens according to claim 1, characterized in that: The first lens has positive optical power and is convex-convex in shape. The second lens has negative optical power and its shape is convex-concave or concave-convex; The third lens has positive optical power and is convex-convex in shape; The fourth lens has negative optical power and its shape is concave or convex. The fifth lens has positive optical power and its shape is concave-convex or its side surface is convex.

3. The zoom lens according to claim 1, characterized in that: The sixth lens has negative optical power and is concave in shape; The seventh lens has positive optical power and its shape is concave-convex or convex-convex; The eighth lens has negative optical power and its object side is concave. The ninth lens has negative optical power and is concave in shape; The tenth lens has positive optical power and its object-side surface is convex.

4. The zoom lens according to claim 1, characterized in that: The twelfth lens has negative optical power and is convex-concave in shape; The fourteenth lens has positive or negative optical power, and its shape is convex-concave, concave-concave, or convex-convex. The fifteenth lens has positive optical power and its image-side surface is convex. The sixteenth lens has negative optical power and is concave in shape.

5. The zoom lens according to claim 1, characterized in that: The seventeenth lens has positive or negative optical power and its shape is convex or concave. The eighteenth lens has positive or negative optical power and its shape is convex-concave or convex-convex; The nineteenth lens has positive optical power and its shape is either convex-convex or concave-convex; The seventeenth lens and the eighteenth lens have opposite positive and negative optical powers.

6. The zoom lens according to any one of claims 1 to 5, characterized in that, The zoom lens satisfies at least one of the following conditions: 2.201≤FG1 / FW≤3.007; -0.964≤FG2 / FW≤-0.716; 0.653≤FG3 / FW≤1.141; -1.229≤FG4 / FW≤-0.761; 0.903≤FG5 / FW≤1.434; Wherein, FG1 is the effective focal length of the first fixed lens group, FG2 is the effective focal length of the first movable lens group, FG3 is the effective focal length of the second movable lens group, FG4 is the effective focal length of the second fixed lens group, FG5 is the effective focal length of the third movable lens group, and Fw is the effective focal length of the wide-angle end of the zoom lens.

7. The zoom lens according to any one of claims 1 to 5, characterized in that, The zoom lens satisfies at least one of the following conditions: 1.049≤F1 / FG1≤1.360; -2.290≤F2 / FG1≤-1.152; 0.663≤F3 / FG1≤1.099; -1.117≤F4 / FG1≤-0.461; 0.678≤F5 / FG1≤2.449; 1.222≤F6 / FG2≤2.802; -2.648≤F7 / FG2≤-0.831; 0.990≤F8 / FG2≤2.542; 1.288≤F9 / FG2≤2.382; 1.002≤F10 / FG3≤1.760; 2.606≤FB11 / FG3≤20.404; 1.031≤F12 / FG4≤5.944; -1.382≤FB13 / FG4≤0.793; -0.523≤F14 / FG4≤1.456; -1.882≤F15 / FG4≤-0.325; 0.365≤F16 / FG4≤0.674; -3.477≤F17 / FG5≤1.854; -2.132≤F18 / FG5≤1.045; 0.804≤F19 / FG5≤3.003; Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, FG1 is the effective focal length of the first fixed lens group, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, FG2 is the effective focal length of the first movable lens group, F10 is the effective focal length of the tenth lens, and F11 is the effective focal length of the eleventh lens. The effective focal length values ​​of the lens groups are as follows: FG3 is the effective focal length value of the second moving lens group; F12 is the effective focal length value of the twelfth lens; F13 is the effective focal length value of the thirteenth lens group; F14 is the effective focal length value of the fourteenth lens; F15 is the effective focal length value of the fifteenth lens; F16 is the effective focal length value of the sixteenth lens; FG4 is the effective focal length value of the second fixed lens group; F17 is the effective focal length value of the seventeenth lens; F18 is the effective focal length value of the eighteenth lens; F19 is the effective focal length value of the nineteenth lens; and FG5 is the effective focal length value of the third moving lens group.

8. The zoom lens according to any one of claims 1 to 5, characterized in that, The zoom lens satisfies at least one of the following conditions: 6.512≤TTL / H≤8.401; 3.240≤TTL / FW≤4.180; 0.900≤TTL / FT≤1.162; Wherein, TTL is the total optical length of the zoom lens, H is the holographic height of the zoom lens, Fw is the effective focal length at the wide-angle end of the zoom lens, and FT is the effective focal length at the telephoto end of the zoom lens.

9. The zoom lens according to any one of claims 1 to 5, characterized in that, The zoom lens satisfies at least one of the following conditions: 2.446≤FG1 / FW≤2.734; -0.876≤FG2 / FW≤-0.796; 0.725≤FG3 / FW≤1.037; -1.117≤FG4 / FW≤-0.846; 1.003≤FG5 / FW≤1.304; Wherein, FG1 is the effective focal length of the first fixed lens group, FG2 is the effective focal length of the first movable lens group, FG3 is the effective focal length of the second movable lens group, FG4 is the effective focal length of the second fixed lens group, FG5 is the effective focal length of the third movable lens group, and Fw is the effective focal length of the wide-angle end of the zoom lens.

10. The zoom lens according to any one of claims 1 to 5, characterized in that, The zoom lens satisfies at least one of the following conditions: 1.165≤F1 / FG1≤1.236; -2.082≤F2 / FG1≤-1.280; 0.737≤F3 / FG1≤0.999; -1.015≤F4 / FG1≤-0.512; 0.753≤F5 / FG1≤2.226; 1.358≤F6 / FG2≤2.547; -2.407≤F7 / FG2≤-0.923; 1.100≤F8 / FG2≤2.311; 1.431≤F9 / FG2≤2.165; 1.113≤F10 / FG3≤1.600; 2.896≤FB11 / FG3≤18.549; 1.146≤F12 / FG4≤5.404; -1.256≤FB13 / FG4≤0.721; -0.475≤F14 / FG4≤1.324; -1.711≤F15 / FG4≤-0.361; 0.406≤F16 / FG4≤0.613; -3.161≤F17 / FG5≤1.685; -1.938≤F18 / FG5≤0.950; 0.893≤F19 / FG5≤2.730; Wherein, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, F4 is the effective focal length of the fourth lens, F5 is the effective focal length of the fifth lens, FG1 is the effective focal length of the first fixed lens group, F6 is the effective focal length of the sixth lens, F7 is the effective focal length of the seventh lens, F8 is the effective focal length of the eighth lens, F9 is the effective focal length of the ninth lens, FG2 is the effective focal length of the first movable lens group, F10 is the effective focal length of the tenth lens, and F11 is the effective focal length of the eleventh lens. The effective focal length values ​​of the lens groups are as follows: FG3 is the effective focal length value of the second moving lens group; F12 is the effective focal length value of the twelfth lens; F13 is the effective focal length value of the thirteenth lens group; F14 is the effective focal length value of the fourteenth lens; F15 is the effective focal length value of the fifteenth lens; F16 is the effective focal length value of the sixteenth lens; FG4 is the effective focal length value of the second fixed lens group; F17 is the effective focal length value of the seventeenth lens; F18 is the effective focal length value of the eighteenth lens; F19 is the effective focal length value of the nineteenth lens; and FG5 is the effective focal length value of the third moving lens group.

11. The zoom lens according to any one of claims 1 to 5, characterized in that, The zoom lens satisfies at least one of the following conditions: 7.235≤TTL / H≤7.637; 3.600≤TTL / FW≤3.800; 1.000≤TTL / FT≤1.056; Wherein, TTL is the total optical length of the zoom lens, H is the holographic height of the zoom lens, Fw is the effective focal length at the wide-angle end of the zoom lens, and FT is the effective focal length at the telephoto end of the zoom lens.

Images