Optical zoom lens

Abstract

The application relates to an optical zoom lens, which comprises a first lens group, a second lens group and a third lens group arranged in sequence along an optical axis from an object side to an image side; wherein the second lens group is a zoom group, and the third lens group is a focusing group; the first lens group comprises a first lens with positive refractive power and a second lens with negative refractive power; the second lens group comprises a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power and a sixth lens with positive refractive power; the third lens group comprises a seventh lens with negative refractive power, an eighth lens with positive refractive power and a ninth lens with refractive power; the optical zoom lens satisfies the conditions of:-3.05f12 / f3456<-2.56 and-3.10f789 / R18<-2.55. The application realizes the multi-focus zoom function without adding an additional long-focus module, thereby meeting the design requirements of a miniaturized terminal.

Description

Technical Field

[0001] This application relates to the field of imaging system technology, and more particularly to an optical zoom lens. Background Technology

[0002] With the rapid development of mobile terminal imaging technology, users' demands for telephoto shooting functions are becoming increasingly diversified. Traditional fixed-focus telephoto lenses can no longer meet the needs of long-distance shooting in various scenarios. To achieve multi-focal-length optical zoom effects, a common solution in existing technology is to add an additional telephoto lens module within the device, using a combination of dual telephoto modules to cover different focal length ranges. While this solution can expand zoom capabilities to some extent, it is limited by the internal space of mobile terminals. Adding a telephoto module significantly increases the overall size of the lens module, which is detrimental to the design of thinner and smaller terminal devices, and also leads to increased manufacturing costs.

[0003] Therefore, how to achieve efficient optical zoom within a limited space has become a technical challenge that urgently needs to be solved in this field. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this application is to provide an optical zoom lens that achieves multi-focal length zoom function without adding an additional telephoto module, thereby meeting the design requirements of miniaturized terminals.

[0005] To achieve the aforementioned objective, this application provides an optical zoom lens, comprising, arranged sequentially along the optical axis from the object side to the image side: a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power, totaling three lens groups with optical power; wherein, the second lens group is a zoom group, and the third lens group is a focusing group; the position of the first lens group is fixed, and the second and third lens groups move along the optical axis, wherein, when the second lens group moves along the optical axis from the object side to the image side, the focal length of the optical zoom lens changes sequentially from short to long; when the third lens group moves along the optical axis from the object side to the image side, the object distance of the optical zoom lens switches from infinity to macro.

[0006] The first lens group includes, arranged sequentially along the optical axis from the object side to the image side: a first lens with positive optical power, whose image side is convex; and a second lens with negative optical power, whose object side is concave.

[0007] The second lens group includes the following lenses arranged sequentially along the optical axis from the object side to the image side: a third lens with positive optical power, whose image side is convex; a fourth lens with positive optical power; a fifth lens with negative optical power, whose image side is concave; and a sixth lens with positive optical power, whose object side is concave and whose image side is convex.

[0008] The third lens group includes the following lenses arranged sequentially along the optical axis from the object side to the image side: a seventh lens with negative optical power, whose object side is concave and whose image side is convex; an eighth lens with positive optical power, whose object side is concave and whose image side is convex; and a ninth lens with optical power, whose object side is convex and whose image side is concave.

[0009] The optical zoom lens satisfies:

[0010] -3.05 < f12 / f3456 < -2.56;

[0011] -3.10 < f789 / R18 < -2.55;

[0012] Wherein, f12 is the combined focal length of the first lens and the second lens, f3456 is the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens; f789 is the combined focal length of the seventh lens, the eighth lens and the ninth lens, and R18 is the radius of curvature of the image side surface of the ninth lens.

[0013] According to one technical solution of this application, the optical zoom lens includes multiple zoom modes; the optical zoom lens satisfies: 13.2mm. <fmax-fmin<14.2mm;

[0014] Wherein, fmax is the maximum effective focal length of the optical zoom lens during the zoom process, and fmin is the minimum effective focal length of the optical zoom lens during the zoom process.

[0015] According to one technical solution of this application, the optical zoom lens satisfies: -18.80 < f12 / (CT1+CT2) < -13.50;

[0016] Where f12 is the combined focal length of the first lens and the second lens, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

[0017] According to one technical solution of this application, the optical zoom lens satisfies: 1.80 < CT3 / SAG31 < 2.15;

[0018] Wherein, CT3 is the center thickness of the third lens on the optical axis, and SAG31 is the on-axis displacement between the intersection of the object-side surface of the third lens and the optical axis and the vertex of the effective radius of the optical region on the object-side surface of the third lens.

[0019] According to one technical solution of this application, the optical zoom lens satisfies: 3.95 < T78 / T89 < 38.90;

[0020] Wherein, T78 is the air gap between the seventh lens and the eighth lens on the optical axis, and T89 is the air gap between the eighth lens and the ninth lens on the optical axis.

[0021] According to one technical solution of this application, the optical zoom lens satisfies: 2.20 < (CT8 + CT9) / CT7 < 3.95;

[0022] Wherein, CT7 is the center thickness of the seventh lens on the optical axis, CT8 is the center thickness of the eighth lens on the optical axis, and CT9 is the center thickness of the ninth lens on the optical axis.

[0023] According to one technical solution of this application, the optical zoom lens satisfies: -5.45 < R2 / f1 < -0.64;

[0024] Where R2 is the radius of curvature of the image-side surface of the first lens, and f1 is the effective focal length of the first lens.

[0025] According to one technical solution of this application, the optical zoom lens satisfies: 1.19 < f2*N2 / R3 < 2.10;

[0026] Where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and R3 is the radius of curvature of the object side surface of the second lens.

[0027] According to one technical solution of this application, the optical zoom lens satisfies: 2.28 < (R6-R5) / (R6+R5) < 3.05;

[0028] Wherein, R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0029] According to one technical solution of this application, the optical zoom lens satisfies: 1.00 < f4 / f3 < 1.61;

[0030] Where f3 is the effective focal length of the third lens and f4 is the effective focal length of the fourth lens.

[0031] According to one technical solution of this application, the optical zoom lens satisfies: -2.40 < f5*N5 / R10 < -0.50;

[0032] Where f5 is the effective focal length of the fifth lens, N5 is the refractive index of the fifth lens, and R10 is the radius of curvature of the image-side surface of the fifth lens.

[0033] According to one technical solution of this application, the optical zoom lens satisfies: -5.90 < R11 / f6 < -0.85;

[0034] Wherein, R11 is the radius of curvature of the object side surface of the sixth lens, and f6 is the effective focal length of the sixth lens.

[0035] According to one technical solution of this application, the optical zoom lens satisfies: 1.15 < (R11 + R12) / (R11 - R12) < 2.30;

[0036] Wherein, R11 is the radius of curvature of the object side of the sixth lens, and R12 is the radius of curvature of the image side of the sixth lens.

[0037] According to one technical solution of this application, the optical zoom lens satisfies: 1.85 < f7 / R13 < 3.10;

[0038] Where f7 is the effective focal length of the seventh lens, and R13 is the radius of curvature of the object side surface of the seventh lens.

[0039] According to one technical solution of this application, the optical zoom lens satisfies: -2.80 < f8 / R16 < -1.50;

[0040] Where f8 is the effective focal length of the eighth lens, and R16 is the radius of curvature of the image-side surface of the eighth lens.

[0041] According to one technical solution of this application, the optical zoom lens satisfies: 1.65 < (CT4 + T45) / CT5 < 2.95;

[0042] 0.95<(CT3+T34) / (T56+CT6)<1.90;

[0043] 2.20<(CT8+CT9) / CT7<3.95;

[0044] 1.00 < DT11 / DT92 < 1.20;

[0045] Wherein, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, T45 is the air gap between the fourth and fifth lenses on the optical axis; CT3 is the center thickness of the third lens on the optical axis, T34 is the air gap between the third and fourth lenses on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, T56 is the air gap between the fifth and sixth lenses on the optical axis; CT7 is the center thickness of the seventh lens on the optical axis, CT8 is the center thickness of the eighth lens on the optical axis, CT9 is the center thickness of the ninth lens on the optical axis; DT11 is the effective radius of the object-side surface of the first lens, and DT92 is the effective radius of the image-side surface of the ninth lens.

[0046] The beneficial effects of this application are:

[0047] The optical zoom lens of this application consists of a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power. By using the second lens group for zooming and the third lens group for focusing, the optical focal length can be varied from 3X to 5X. It also meets the miniaturization requirement, allowing it to be mounted on a mobile phone, offering significant advantages over existing solutions. By rationally allocating the matching relationship between the optical power of the first and second lens combinations of the first lens group and the third, fourth, fifth, and sixth lens combinations of the second lens group, the light-gathering ability of the front and rear lens groups can be balanced, effectively correcting system axial and transverse aberrations, and improving the consistency of imaging across the entire aperture and field of view. The focusing action of the rear focusing lens group works in coordination with the first and second lens groups. Especially under the constraint of the curvature radius of the image side surface of the ninth lens, system aberration fluctuations during focusing can be significantly suppressed, improving the problem of image edge blurring. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0049] Figure 1 and Figure 2 The diagrams show the structural parameters of the optical zoom lens of Embodiment 1 of this application in Z1 mode when the object distance is infinite and when it is macro.

[0050] Figure 3 and Figure 4 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 1 of this application are shown respectively in Z1 mode when the object distance is infinite and macro.

[0051] Figure 5 and Figure 6 The diagrams show the structural parameters of the optical zoom lens of Embodiment 1 of this application in Z2 mode when the object distance is infinite and when it is macro.

[0052] Figure 7 and Figure 8 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 1 of this application are shown respectively in Z2 mode with an infinity object distance and macro mode.

[0053] Figure 9 and Figure 10 The diagrams show the structural parameters of the optical zoom lens of Embodiment 1 of this application in Z3 mode when the object distance is infinite and when it is macro.

[0054] Figure 11 and Figure 12 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 1 of this application are shown respectively in Z3 mode with an infinity object distance and macro mode.

[0055] Figure 13 and Figure 14 The diagrams show the structural parameters of the optical zoom lens of Embodiment 2 of this application when the object distance is infinite and macro in Z1 mode;

[0056] Figure 15 and Figure 16 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 2 of this application are shown respectively in Z1 mode when the object distance is infinite and macro.

[0057] Figure 17 and Figure 18 The diagrams show the structural parameters of the optical zoom lens of Embodiment 2 of this application when the object distance is infinite and macro in Z2 mode;

[0058] Figure 19 and Figure 20 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 2 of this application are shown respectively in Z2 mode with an infinity object distance and macro mode.

[0059] Figure 21 and Figure 22 The diagrams show the structural parameters of the optical zoom lens of Embodiment 2 of this application in Z3 mode when the object distance is infinite and when it is macro.

[0060] Figure 23 and Figure 24 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 2 of this application are shown respectively in Z3 mode with an infinity object distance and macro mode.

[0061] Figure 25 and Figure 26 The diagrams show the structural parameters of the optical zoom lens of Embodiment 3 of this application when the object distance is infinite and macro in Z1 mode;

[0062] Figure 27 and Figure 28 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 3 of this application are shown respectively in Z1 mode with an infinity object distance and macro mode.

[0063] Figure 29 and Figure 30The diagrams show the structural parameters of the optical zoom lens of Embodiment 3 of this application when the object distance is infinite and macro in Z2 mode;

[0064] Figure 31 and Figure 32 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 3 of this application are shown respectively in Z2 mode with an infinity object distance and macro mode.

[0065] Figure 33 and Figure 34 The diagrams show the structural parameters of the optical zoom lens of Embodiment 3 of this application in Z3 mode when the object distance is infinite and when it is macro.

[0066] Figure 35 and Figure 36 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 3 of this application are shown respectively in Z3 mode with an infinity object distance and macro mode.

[0067] Figure 37 and Figure 38 The diagrams show the structural parameters of the optical zoom lens of Embodiment 4 of this application in Z1 mode when the object distance is infinite and when it is macro.

[0068] Figure 39 and Figure 40 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 4 of this application are shown respectively in Z1 mode when the object distance is infinite and macro.

[0069] Figure 41 and Figure 42 The diagrams show the structural parameters of the optical zoom lens of Embodiment 4 of this application when the object distance is infinite and macro in Z2 mode;

[0070] Figure 43 and Figure 44 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 4 of this application are shown respectively in Z2 mode with an infinity object distance and macro mode.

[0071] Figure 45 and Figure 46 The diagrams show the structural parameters of the optical zoom lens of Embodiment 4 of this application in Z3 mode when the object distance is infinite and when it is macro.

[0072] Figure 47 and Figure 48 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 4 of this application are shown respectively in Z3 mode with an infinity object distance and macro mode.

[0073] Figure 49 and Figure 50 The diagrams show the structural parameters of the optical zoom lens of Embodiment 5 of this application in Z1 mode when the object distance is infinity and when it is macro.

[0074] Figure 51 and Figure 52 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 5 of this application are shown respectively in Z1 mode when the object distance is infinite and macro.

[0075] Figure 53 and Figure 54 The diagrams show the structural parameters of the optical zoom lens of Embodiment 5 of this application in Z2 mode when the object distance is infinite and when it is macro.

[0076] Figure 55 and Figure 56 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 5 of this application are shown respectively in Z2 mode with an infinity object distance and macro mode.

[0077] Figure 57 and Figure 58 The diagrams show the structural parameters of the optical zoom lens of Embodiment 5 of this application in Z3 mode when the object distance is infinite and when it is macro.

[0078] Figure 59 and Figure 60 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment 5 of this application are shown respectively in Z3 mode with an infinity object distance and macro mode.

[0079] Figure 61 and Figure 62 The diagrams show the structural parameters of the optical zoom lens of Embodiment Six of this application in Z1 mode when the object distance is infinite and when it is macro.

[0080] Figure 63 and Figure 64 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment Six of this application are shown respectively in Z1 mode when the object distance is infinite and macro.

[0081] Figure 65 and Figure 66 The diagrams show the structural parameters of the optical zoom lens of Embodiment 6 of this application when the object distance is infinite and macro in Z2 mode;

[0082] Figure 67 and Figure 68The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment Six of this application are shown respectively in Z2 mode with an infinity object distance and macro mode.

[0083] Figure 69 and Figure 70 The diagrams show the structural parameters of the optical zoom lens of Embodiment 6 of this application in Z3 mode when the object distance is infinite and when it is macro.

[0084] Figure 71 and Figure 72 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical zoom lens of Embodiment Six of this application are shown respectively in Z3 mode with an infinity object distance and macro mode. Detailed Implementation

[0085] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0086] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0087] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0088] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0089] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0090] 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 feature.

[0091] 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.

[0092] In this application, the object side refers to the side of the optical zoom lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical zoom lens facing the imaging plane. In the following text, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane.

[0093] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) 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 so specified herein.

[0094] The following embodiments illustrate only a few implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application's patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application.

[0095] like Figure 1 As shown, the optical zoom lens of this application includes three lens groups with optical powers arranged sequentially along the optical axis from the object side to the image side: a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power; wherein, the second lens group is the zoom group and the third lens group is the focusing group.

[0096] The first lens group includes two lenses with optical power arranged sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, whose image side is convex; and a second lens with negative optical power, whose object side is concave.

[0097] The second lens group includes four lenses with optical power arranged sequentially from the object side to the image side along the optical axis: a third lens with positive optical power, whose image side is convex; a fourth lens with positive optical power; a fifth lens with negative optical power, whose image side is concave; and a sixth lens with positive optical power, whose object side is concave and whose image side is convex.

[0098] The third lens group comprises three lenses of optical power arranged sequentially from the object side to the image side along the optical axis: a seventh lens with negative optical power, whose object side is concave and whose image side is convex; an eighth lens with positive optical power, whose object side is concave and whose image side is convex; and a ninth lens with optical power, whose object side is convex and whose image side is concave.

[0099] In some embodiments of this application, the optical imaging system may also include color filters and / or protective glass.

[0100] In some embodiments of this application, the optical zoom lens satisfies: -3.05 < f12 / f3456 < -2.56; -3.10 < f789 / R18 < -2.55; where f12 is the combined focal length of the first and second lenses, f3456 is the combined focal length of the third, fourth, fifth, and sixth lenses, f789 is the combined focal length of the seventh, eighth, and ninth lenses, and R18 is the radius of curvature of the image-side surface of the ninth lens. By rationally allocating the matching relationship of the optical power of the first and second lens combinations of the first lens group and the third, fourth, fifth, and sixth lens combinations of the second lens group, the light-gathering ability of the front and rear groups of the lens can be balanced, effectively correcting the axial and transverse aberrations of the system, improving the consistency of imaging across the entire aperture and field of view. The focusing action of the rear focusing lens group works in coordination with the first and second lens groups. Especially under the constraint of the radius of curvature of the image-side surface of the ninth lens, the system aberration fluctuations during focusing can be suppressed, and the problem of image edge blurring can be improved.

[0101] In some embodiments of this application, the first lens group is fixed in position, while the second and third lens groups move along the optical axis. Specifically, the second lens group moves from the object side to the image side along the optical axis, causing the focal length of the optical zoom lens to change sequentially from short to long; the third lens group moves from the object side to the image side along the optical axis, switching the object distance of the optical zoom lens from infinity to macro. The axial movement of the second lens group achieves the change in the focal length of the entire optical system, thus realizing the optical zoom function. The unique design of the second lens group ensures that the lens resolution remains clear even after the focal length changes.

[0102] In some embodiments of the present application, the optical zoom lens comprises a plurality of groups of zoom modes; the optical zoom lens satisfies: 13.2mm<fmax-fmin<14.2mm, where fmax is the maximum value of the effective focal length of the optical zoom lens during the zoom process, and fmin is the minimum value of the effective focal length of the optical zoom lens during the zoom process. By widening the difference between the maximum focal length and the minimum focal length of the optical zoom lens, an optical focal length range variation equivalent to 70mm to 115mm can be achieved, and the coverage of the focal length range is improved as much as possible. In this way, the optical zoom lens can capture a farther range in the actual use process, realizing the effect that one telephoto lens is equivalent to two fixed-focus telephoto lenses.

[0103] In some embodiments of the present application, the optical zoom lens satisfies: -18.80<f12 / (CT1+CT2)<-13.50, where f12 is the combined focal length of the first lens and the second lens, CT1 is the central thickness of the first lens, and CT2 is the central thickness of the second lens. By controlling the central thickness of each lens in the first lens group to make the respective thicknesses meet the assembly stability requirements, the assembly deformation of the lenses and the reflection energy of ghost images can be reduced, and the distortion and chromatic aberration of the optical zoom lens can be better balanced, which is beneficial to the miniaturization of the system.

[0104] In some embodiments of the present application, the optical zoom lens satisfies: 1.80<CT3 / SAG31<2.15, where CT3 is the central thickness of the third lens on the optical axis, and SAG31 is the on-axis displacement from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the optical region of the object side surface of the third lens. By reasonably controlling the ratio of the central thickness of the third lens to the sagittal height of the object side surface of the third lens, the shape characteristics of the third lens can be effectively restricted, the edge of the lens is effectively prevented from being excessively bent, and a certain structural strength of the lens is ensured at the same time, so as to avoid difficulties in the actual processing process.

[0105] In some embodiments of the present application, the optical zoom lens satisfies: 1.65<(CT4+T45) / CT5<2.95, where CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and T45 is the air interval between the fourth lens and the fifth lens on the optical axis. The sum of the central thickness of the fourth lens and the air interval between the fourth lens and the fifth lens on the optical axis is reasonably distributed. By controlling the range of the ratio of this sum to the central thickness of the fifth lens, the thickness complementation of the fourth lens and the fifth lens can be realized, basically forming a thick-thin lens configuration, which has a good cancellation effect on positive and negative spherical aberration, positive and negative astigmatism, positive and negative distortion, chromatic aberration and the like, and has a good complementary buffering effect on extreme environments such as high and low temperatures, exhibiting excellent temperature drift performance.

[0106] In some embodiments of this application, the optical zoom lens satisfies: 0.95 < (CT3 + T34) / (T56 + CT6) < 1.90; where CT3 is the center thickness of the third lens on the optical axis, T34 is the air gap between the third and fourth lenses on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and T56 is the air gap between the fifth and sixth lenses on the optical axis. By reasonably allocating the sum of the center thickness of the third lens on the optical axis and the sum of the air gaps between the third and fourth lenses on the optical axis, and the sum of the center thickness of the sixth lens on the optical axis and the sum of the air gaps between the fifth and sixth lenses on the optical axis, the ratio of this sum is constrained within a limited range. This ensures the focusing characteristics of the second lens group, enabling focusing at different focal lengths while obtaining better refractive power. By complementaryly eliminating astigmatism and spherical aberration caused by these two lens groups, the overall image quality is improved, and better resolution is obtained.

[0107] In some embodiments of this application, the optical zoom lens satisfies: 3.95 < T78 / T89 < 38.90; where T78 is the air gap between the seventh and eighth lenses on the optical axis, and T89 is the air gap between the eighth and ninth lenses on the optical axis. By reasonably allocating the ratio of the air gap between the seventh and eighth lenses on the optical axis to that between the eighth and ninth lenses on the optical axis, the sensitivity of the third lens group can be reduced, the field curvature of the system can be better balanced, and the optical zoom lens can be ensured to obtain better image quality.

[0108] In some embodiments of this application, the optical zoom lens satisfies: 2.20 < (CT8 + CT9) / CT7 < 3.95; where CT7 is the center thickness of the seventh lens on the optical axis, CT8 is the center thickness of the eighth lens on the optical axis, and CT9 is the center thickness of the ninth lens on the optical axis. By reasonably allocating the ratio range between the sum of the center thicknesses of the eighth and ninth lenses and the center thickness of the seventh lens, the thickness complementarity of the lenses within the third lens group can be achieved. This effectively constrains the central surface shape tendency of each lens, effectively reducing assembly errors and improving assembly stability during processing.

[0109] In some embodiments of this application, the optical zoom lens satisfies: -5.45 < R2 / f1 < -0.64; where R2 is the radius of curvature of the image-side surface of the first lens, and f1 is the effective focal length of the first lens. By reasonably controlling the range of the above conditional expression, the optical power range of the first lens can be effectively limited, which is beneficial to increasing the effective aperture value of the system and reducing the sensitivity and aberration of the lens.

[0110] In some embodiments of this application, the optical zoom lens satisfies: 1.19 < f2 * N2 / R3 < 2.10; where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and R3 is the radius of curvature of the object-side surface of the second lens. By effectively constraining the ratio of the product of the effective focal length and the refractive index of the second lens to the radius of curvature of the object-side surface of the second lens, the light deflection capability of the second lens is optimized, suppressing front-end spherical aberration, coma, and stray ghosting, and balancing optical power to reduce chromatic aberration accumulation.

[0111] In some embodiments of this application, the optical zoom lens satisfies: 2.28 < (R6 - R5) / (R6 + R5) < 3.05; where R5 is the radius of curvature of the object-side surface of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens. By reasonably constraining the specified ratio between the radius of curvature of the object-side surface and the radius of curvature of the image-side surface of the third lens, the meniscus shape of the third lens can be effectively limited, effectively correcting field curvature and astigmatism, reducing the difference in resolving power between the center and the edges, and improving light transmittance.

[0112] In some embodiments of this application, the optical zoom lens satisfies: 1.00 < f4 / f3 < 1.61; where f3 is the effective focal length of the third lens and f4 is the effective focal length of the fourth lens. By reasonably allocating the ratio of the effective focal length of the third lens to that of the fourth lens, second-order chromatic aberration and residual coma can be corrected step by step. By controlling the focal length ratio of the third and fourth lenses to be greater than 1, the optical power of the fourth lens is moderately greater than that of the third lens, enhancing the convergence effect on large-angle edge light, reducing the overall length of the lens to achieve miniaturization, and preventing distortion deterioration and manufacturing damage caused by excessively large optical power of a single lens.

[0113] In some embodiments of this application, the optical zoom lens satisfies: -2.40 < f5 * N5 / R10 < -0.50; where f5 is the effective focal length of the fifth lens, N5 is the refractive index of the fifth lens, and R10 is the radius of curvature of the image-side surface of the fifth lens. By effectively constraining the ratio of the product of the effective focal length and the refractive index of the fifth lens to the radius of curvature of the image-side surface of the fifth lens, the negative parameters of the fifth lens are used to compensate for front-group distortion, field curvature, and transverse chromatic aberration, thereby balancing the overall image distortion and reducing stray light at the rear.

[0114] In some embodiments of this application, the optical zoom lens satisfies: -5.90 < R11 / f6 < -0.85; where R11 is the radius of curvature of the object-side surface of the sixth lens, and f6 is the effective focal length of the sixth lens. By reasonably allocating the ratio of the radius of curvature of the object-side surface of the sixth lens to the effective focal length of the sixth lens, and keeping this ratio constant as a negative value, the object-side surface of the sixth lens is defined as a diverging surface. This reasonably matches the curvature of the surface with the optical power of the sixth lens, corrects the residual field curvature at the rear end, suppresses edge light diffusion, and reduces image distortion.

[0115] In some embodiments of this application, the optical zoom lens satisfies: 1.15 < (R11 + R12) / (R11 - R12) < 2.30; where R11 is the radius of curvature of the object-side surface of the sixth lens, and R12 is the radius of curvature of the image-side surface of the sixth lens. By reasonably constraining the specified ratio between the radius of curvature of the object-side surface and the radius of curvature of the image-side surface of the sixth lens, the curvature ratio of the two surfaces of the sixth lens is limited, the meniscus correction structure is optimized, and the excessive difference in curvature on both sides is prevented from causing a significant difference in lens thickness. This constraint can reduce transverse chromatic aberration and stray light, and balance the resolving power across the entire field of view.

[0116] In some embodiments of this application, the optical zoom lens satisfies: 1.85 < f7 / R13 < 3.10; where f7 is the effective focal length of the seventh lens, and R13 is the radius of curvature of the object-side surface of the seventh lens. By rationally allocating the ratio of the effective focal length of the seventh lens to the radius of curvature of its object-side surface, the degree of curvature of the object-side surface of the seventh lens can be controlled, the optical power can be appropriately allocated, and the light-gathering ability of the object-side surface can be adjusted. This allows the lens assembly to maintain miniaturization while possessing high aberration correction capability and achieving better manufacturability.

[0117] In some embodiments of this application, the optical zoom lens satisfies: -2.80 < f8 / R16 < -1.50; where f8 is the effective focal length of the eighth lens, and R16 is the radius of curvature of the image-side surface of the eighth lens. By rationally allocating the ratio of the effective focal length of the eighth lens to the radius of curvature of its image-side surface, it is possible to compensate for the accumulated distortion and astigmatism of the front group by utilizing the optical power of the eighth lens in conjunction with the image-side surface, thereby reducing stray light reflection from the image-side surface, reducing stray light haze on the photosensitive surface, and improving image contrast.

[0118] In some embodiments of this application, the optical zoom lens satisfies: 1.00 < DT11 / DT92 < 1.20; where DT11 is the effective radius of the object-side surface of the first lens, and DT92 is the effective radius of the image-side surface of the ninth lens. By rationally allocating the ratio of the effective radius of the object-side surface of the first lens to the effective radius of the image-side surface of the ninth lens, the ratio of the light-receiving aperture of the first lens to the light-receiving aperture of the ninth lens is made greater than 1. This ensures that the light-receiving aperture of the first lens is slightly larger than the light-receiving aperture at the end, thereby ensuring that incident light rays in the edge field of view can pass completely through the optical path. This avoids edge beams being cut off by the lens barrel and lenses, causing vignetting at the four corners of the image, improving the uniformity of illumination across the entire image, and facilitating the miniaturization and assembly of the lens structure.

[0119] The optical zoom lens according to the above embodiments of this application can employ multiple lenses, such as the nine lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-lens connection is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the optical zoom lens.

[0120] In some embodiments of this application, the lens material in the optical zoom lens provided by this application can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. When the lens material is glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical zoom lens. The optical zoom lens provided by this application can adopt an all-plastic lens structure, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a good balance between lens miniaturization and high image quality.

[0121] In some embodiments of this application, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens can be spherical lenses or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in optical zoom lenses, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens of this application can all be aspherical lenses.

[0122] When an aspherical lens is used, the shapes of the aspherical surfaces of the optical lens satisfy the following equation: ;

[0123] In the above formula, The height perpendicular to the optical axis is along the optical axis. The axial distance from the vertex to the surface at the location; This represents the curvature at the vertex of the aspherical surface. The conic coefficient; , , , , , , ... represent aspherical coefficients of order 4, 6, 8, 10, 12, 14, and 16 respectively.

[0124] The present application will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical zoom lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the implementation of the present application is not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovation of the present application should be considered as equivalent substitutions and are included within the protection scope of the present application. In the present application, Z1 mode, Z2 mode, and Z3 mode correspond to the zoom modes of the optical zoom lens at 3X, 4X, and 5X focal lengths, respectively. As the second lens group moves from the image side to the object side, the focal length of the optical zoom lens changes sequentially from 3X focal length → 4X focal length → 5X focal length; as the third lens group moves from the object side to the image side, the focusing object distance of the optical zoom lens switches from infinity to 300mm.

[0125] Example 1

[0126] like Figures 1 to 12 As shown, the optical zoom lens includes an optical element G arranged sequentially from the object side to the image side along the optical axis, a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power. The first lens group includes a first lens E1 and a second lens E2 arranged sequentially from the object side to the image side along the optical axis. The second lens group includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis. The third lens group includes a seventh lens E7, an eighth lens E8, and a ninth lens E9 arranged sequentially from the object side to the image side along the optical axis.

[0127] In this system, optical element G is an equilateral right-angled triangular prism used to bend the light path by 90°, and its object-side surface S1 and image-side surface S2 are both equivalent to planes. The first lens E1 has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex. The second lens E2 has negative optical power, and its object-side surface S5 and image-side surface S6 are both concave. The third lens E3 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex. The fourth lens E4 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex. The fifth lens E5 has negative optical power, and its object-side surface S11 and image-side surface S12 are both concave. The sixth lens E6 has positive optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex. The seventh lens E7 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex; the eighth lens E8 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex; the ninth lens E9 has negative optical power, with its object-side surface S19 being convex and its image-side surface S20 being concave. Light from the object passes sequentially through the surfaces S1 to S20 of each lens and is finally imaged on the imaging surface S23. Here, S21 and S22 are the two surfaces of the protective glass or filter, OBJ (not shown in the figure) is the object surface, and STO is the aperture stop, which is located between the second lens E2 and the third lens E3.

[0128] Table 1 below shows the basic optical parameters of the optical zoom lens of Embodiment 1. Specifically, Table 1-1 lists the relevant parameters of each lens in the optical zoom lens of this embodiment, including: surface type, radius of curvature, thickness / distance, refractive index of the material, Abbe number, and conic coefficient. The units of radius of curvature and thickness are millimeters (mm). Table 1-2 lists the relevant parameters of the optical zoom lens of this embodiment in Z1 mode, Table 1-3 lists the relevant parameters of the optical zoom lens of this embodiment in Z2 mode, and Table 1-4 lists the relevant parameters of the optical zoom lens of this embodiment in Z3 mode.

[0129]

[0130] Table 1-1

[0131]

[0132] Table 1-2

[0133]

[0134] Table 1-3

[0135]

[0136] Table 1-4

[0137] Table 2 lists the aspherical coefficients of each aspherical lens in the optical zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0138]

[0139] Table 2

[0140] The optical parameters of the optical zoom lens in Example 1 are shown in Table 13 below, and the values ​​of each conditional expression are shown in Table 14 below.

[0141] Figure 3 (a) Figure 7 (a) Figure 11 (a) shows the on-axis chromatic aberration curves of the optical zoom lens of Embodiment 1 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 4 (a) Figure 8 (a) Figure 12 (a) shows the on-axis chromatic aberration curves of the optical zoom lens of Example 1 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 3 (b) Figure 7 (b) Figure 11 (b) shows the astigmatism curve of the optical zoom lens of Embodiment 1 with an infinite object distance in Z1 mode. Figure 4 (b) Figure 8 (b) Figure 12 (b) shows the astigmatism curves of the optical zoom lens of Example 1 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 3 (c) Figure 7 (c) Figure 11 (c) The distortion curve of the optical zoom lens with infinite object distance in Z1 mode of Example 1 is shown. Figure 4 (c) Figure 8 (c) Figure 12 (c) shows the distortion curves of the optical zoom lens of Embodiment 1 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 3 (d) Figure 7 (d) Figure 11 (d) shows the magnification chromatic aberration curves of the optical zoom lens of Example 1 with an infinite object distance in Z1, Z2, and Z3 modes. Figure 4 (d) Figure 8 (d) Figure 12 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 1 at an object distance of 300mm in modes Z1, Z2, and Z3. The axial chromatic aberration curve represents the deviation of the focal point of light of different wavelengths after passing through the optical zoom lens; its horizontal axis represents the offset in mm, and its vertical axis represents the normalized aperture. The astigmatism curve represents the axial positional offset of light rays at different field of view on the meridional and sagittal image planes after passing through the optical zoom lens; its vertical axis represents the image height in mm, and its horizontal axis represents the actual image plane positional offset in mm. The distortion curve represents the magnitude of imaging distortion corresponding to different image heights; its horizontal axis represents the distortion value in %, and its vertical axis represents the image height in mm. The magnification chromatic aberration curve represents the magnitude of magnification chromatic aberration corresponding to different normalized image heights; its horizontal axis represents the magnification chromatic aberration value in μm, and its vertical axis represents the normalized image height. Figure 3 , 4 As can be seen from 7, 8, 11, and 12, the on-axis chromatic aberration, astigmatism, distortion, and rate-chromatic aberration are well controlled, and the optical zoom lens given in Example 1 can achieve good imaging quality.

[0142] Example 2

[0143] like Figures 13 to 24 As shown, the optical zoom lens includes an optical element G arranged sequentially from the object side to the image side along the optical axis, a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power. The first lens group includes a first lens E1 and a second lens E2 arranged sequentially from the object side to the image side along the optical axis. The second lens group includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis. The third lens group includes a seventh lens E7, an eighth lens E8, and a ninth lens E9 arranged sequentially from the object side to the image side along the optical axis.

[0144] In this system, optical element G is an equilateral right-angled triangular prism used to bend the light path by 90°, and its object-side surface S1 and image-side surface S2 are both equivalent to planes. The first lens E1 has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex. The second lens E2 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The third lens E3 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex. The fourth lens E4 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex. The fifth lens E5 has negative optical power, and its object-side surface S11 and image-side surface S12 are both concave. The sixth lens E6 has positive optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex. The seventh lens E7 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex; the eighth lens E8 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex; the ninth lens E9 has negative optical power, with its object-side surface S19 being convex and its image-side surface S20 being concave. Light from the object passes sequentially through the surfaces S1 to S20 of each lens and is finally imaged on the imaging surface S23. Here, S21 and S22 are the two surfaces of the protective glass or filter, OBJ (not shown in the figure) is the object surface, and STO is the aperture stop, which is located between the second lens E2 and the third lens E3.

[0145] Table 3 below shows the basic optical parameters of the optical zoom lens of Embodiment 2. Specifically, Table 3-1 lists the relevant parameters of each lens in the optical zoom lens of this embodiment, including: surface type, radius of curvature, thickness / distance, refractive index of the material, Abbe number, and conic coefficient. The units of radius of curvature and thickness are millimeters (mm). Table 3-2 lists the relevant parameters of the optical zoom lens of this embodiment in Z1 mode, Table 3-3 lists the relevant parameters of the optical zoom lens of this embodiment in Z2 mode, and Table 3-4 lists the relevant parameters of the optical zoom lens of this embodiment in Z3 mode.

[0146]

[0147] Table 3-1

[0148]

[0149] Table 3-2

[0150]

[0151] Table 3-3

[0152]

[0153] Table 3-4

[0154] Table 4 lists the aspherical coefficients of each aspherical lens in the optical zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0155]

[0156] Table 4

[0157] The optical parameters of the optical zoom lens in Example 2 are shown in Table 13 below, and the values ​​of each condition are shown in Table 14 below.

[0158] Figure 15 (a) Figure 19 (a) Figure 23 (a) shows the on-axis chromatic aberration curves of the optical zoom lens of Embodiment 2 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 16 (a) Figure 20 (a) Figure 24 (a) shows the on-axis chromatic aberration curves of the optical zoom lens in Embodiment 2 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 15 (b) Figure 19 (b) Figure 23 (b) shows the astigmatism curves of the optical zoom lens of Embodiment 2 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 16 (b) Figure 20 (b) Figure 24 (b) shows the astigmatism curves of the optical zoom lens in Embodiment 2 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 15 (c) Figure 19 (c) Figure 23 (c) shows the distortion curves of the optical zoom lens of Embodiment 2 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 16 (c) Figure 20 (c) Figure 24 (c) shows the distortion curves of the optical zoom lens in Embodiment 2 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 15 (d) Figure 19 (d) Figure 23 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 2 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 16 (d) Figure 20 (d) Figure 24 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 2 at an object distance of 300mm in modes Z1, Z2, and Z3. The meanings of the axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve are the same as in Embodiment 1 and will not be repeated here. Figure 15 , 16 As can be seen from 19, 20, 23, and 24, the on-axis chromatic aberration, astigmatism, distortion, and rate-chromatic aberration are well controlled, and the optical zoom lens given in Example 2 can achieve good imaging quality.

[0159] Example 3

[0160] like Figures 25 to 36 As shown, the optical zoom lens includes an optical element G arranged sequentially from the object side to the image side along the optical axis, a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power. The first lens group includes a first lens E1 and a second lens E2 arranged sequentially from the object side to the image side along the optical axis. The second lens group includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis. The third lens group includes a seventh lens E7, an eighth lens E8, and a ninth lens E9 arranged sequentially from the object side to the image side along the optical axis.

[0161] Among them, the optical element G is an equilateral right-angled triangular prism used to bend the light path by 90°, and its object side surface S1 and image side surface S2 are both equivalent to planes. The first lens E1 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex; the second lens E2 has negative optical power, with both its object-side surface S5 and image-side surface S6 being concave; the third lens E3 has positive optical power, with both its object-side surface S7 and image-side surface S8 being convex; the fourth lens E4 has positive optical power, with both its object-side surface S9 and image-side surface S10 being convex; the fifth lens E5 has negative optical power, with both its object-side surface S11 and image-side surface S12 being concave; the sixth lens E6 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex; the seventh lens E7 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex; the eighth lens E8 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex; and the ninth lens E9 has negative optical power, with its object-side surface S19 being convex and its image-side surface S20 being concave. Light from the object passes sequentially through the lens surfaces S1 to S20 and is finally imaged on the imaging surface S23. S21 and S22 are the two surfaces of the protective glass or filter, OBJ (not shown in the figure) is the object surface, and STO is the aperture stop, which is set between the second lens E2 and the third lens E3.

[0162] Table 5 below shows the basic optical parameters of the optical zoom lens of Embodiment 3. Specifically, Table 5-1 lists the relevant parameters of each lens in the optical zoom lens of this embodiment, including: surface type, radius of curvature, thickness / distance, refractive index of the material, Abbe number, and conic coefficient. The units of radius of curvature and thickness are millimeters (mm). Table 5-2 lists the relevant parameters of the optical zoom lens of this embodiment in Z1 mode, Table 5-3 lists the relevant parameters of the optical zoom lens of this embodiment in Z2 mode, and Table 5-4 lists the relevant parameters of the optical zoom lens of this embodiment in Z3 mode.

[0163]

[0164] Table 5-1

[0165]

[0166] Table 5-2

[0167]

[0168] Table 5-3

[0169]

[0170] Table 5-4

[0171] Table 6 lists the aspherical coefficients of each aspherical lens in the optical zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0172]

[0173] Table 6

[0174] The optical parameters of the optical zoom lens in Example 3 are shown in Table 13 below, and the values ​​of each conditional expression are shown in Table 14 below.

[0175] Figure 27 (a) Figure 31 (a) Figure 35 (a) shows the on-axis chromatic aberration curves of the optical zoom lens of Example 3 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 28 (a) Figure 32 (a) Figure 36 (a) shows the on-axis chromatic aberration curves of the optical zoom lens in Example 3 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 27 (b) Figure 31 (b) Figure 35 (b) shows the astigmatism curves of the optical zoom lens of Embodiment 3 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 28 (b) Figure 32 (b) Figure 36 (b) shows the astigmatism curves of the optical zoom lens in Embodiment 3 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 27 (c) Figure 31 (c) Figure 35 (c) shows the distortion curves of the optical zoom lens of Embodiment 3 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 28 (c) Figure 32 (c) Figure 36 (c) shows the distortion curves of the optical zoom lens in Example 3 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 27 (d) Figure 31 (d) Figure 35 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 3 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 28 (d) Figure 32 (d) Figure 36 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 3 at an object distance of 300mm in Z1, Z2, and Z3 modes. The meanings of the axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve are the same as in Embodiment 1 and will not be repeated here. Figure 27 , 28 As can be seen from 31, 32, 35, and 36, the on-axis chromatic aberration, astigmatism, distortion, and rate-chromatic aberration are well controlled, and the optical zoom lens given in Example 3 can achieve good imaging quality.

[0176] Example 4

[0177] like Figures 37 to 48 As shown, the optical zoom lens includes an optical element G arranged sequentially from the object side to the image side along the optical axis, a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power. The first lens group includes a first lens E1 and a second lens E2 arranged sequentially from the object side to the image side along the optical axis. The second lens group includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis. The third lens group includes a seventh lens E7, an eighth lens E8, and a ninth lens E9 arranged sequentially from the object side to the image side along the optical axis.

[0178] In this system, optical element G is an equilateral right-angled triangular prism used to bend the light path by 90°, and its object-side surface S1 and image-side surface S2 are both equivalent to planes. The first lens E1 has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex. The second lens E2 has negative optical power, and its object-side surface S5 and image-side surface S6 are both concave. The third lens E3 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex. The fourth lens E4 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is concave. The fifth lens E5 has negative optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. The sixth lens E6 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex; the seventh lens E7 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex; the eighth lens E8 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex; and the ninth lens E9 has negative optical power, with its object-side surface S19 being convex and its image-side surface S20 being concave. Light from the object passes sequentially through the surfaces S1 to S20 of each lens and is finally imaged on the imaging surface S23. S21 and S22 are the two surfaces of the protective glass or filter, OBJ (not shown in the figure) is the object surface, and STO is the aperture stop, which is positioned between the second lens E2 and the third lens E3.

[0179] Table 7 below shows the basic optical parameters of the optical zoom lens of Embodiment 4. Specifically, Table 7-1 lists the relevant parameters of each lens in the optical zoom lens of this embodiment, including: surface type, radius of curvature, thickness / distance, refractive index of the material, Abbe number, and conic coefficient. The units of radius of curvature and thickness are millimeters (mm). Table 7-2 lists the relevant parameters of the optical zoom lens of this embodiment in Z1 mode, Table 7-3 lists the relevant parameters of the optical zoom lens of this embodiment in Z2 mode, and Table 7-4 lists the relevant parameters of the optical zoom lens of this embodiment in Z3 mode.

[0180]

[0181] Table 7-1

[0182]

[0183] Table 7-2

[0184]

[0185] Table 7-3

[0186]

[0187] Table 7-4

[0188] Table 8 lists the aspherical coefficients of each aspherical lens in the optical zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0189]

[0190] Table 8

[0191] The optical parameters of the optical zoom lens in Example 4 are shown in Table 13 below, and the values ​​of each conditional expression are shown in Table 14 below.

[0192] Figure 39 (a) Figure 43 (a) Figure 47 (a) shows the on-axis chromatic aberration curves of the optical zoom lens of Embodiment 4 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 40 (a) Figure 44 (a) Figure 48 (a) shows the on-axis chromatic aberration curves of the optical zoom lens in Example 4 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 39 (b) Figure 43 (b) Figure 47 (b) shows the astigmatism curves of the optical zoom lens of Embodiment 4 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 40 (b) Figure 44 (b) Figure 48 (b) shows the astigmatism curves of the optical zoom lens in Embodiment 4 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 39 (c) Figure 43 (c) Figure 47 (c) shows the distortion curves of the optical zoom lens of Embodiment 4 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 40 (c) Figure 44 (c) Figure 48 (c) shows the distortion curves of the optical zoom lens in Embodiment 4 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 39 (d) Figure 43 (d) Figure 47 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 4 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 40 (d) Figure 44 (d) Figure 48 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 4 at an object distance of 300mm in modes Z1, Z2, and Z3. The meanings of the axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve are the same as in Embodiment 1 and will not be repeated here. Figure 39 , 40 As can be seen from 43, 44, 47, and 48, the on-axis chromatic aberration, astigmatism, distortion, and rate-chromatic aberration are well controlled, and the optical zoom lens given in Example 4 can achieve good imaging quality.

[0193] Example 5

[0194] like Figures 49 to 60 As shown, the optical zoom lens includes an optical element G arranged sequentially from the object side to the image side along the optical axis, a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power. The first lens group includes a first lens E1 and a second lens E2 arranged sequentially from the object side to the image side along the optical axis. The second lens group includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis. The third lens group includes a seventh lens E7, an eighth lens E8, and a ninth lens E9 arranged sequentially from the object side to the image side along the optical axis.

[0195] In this system, optical element G is an equilateral right-angled triangular prism used to bend the light path by 90°, and its object-side surface S1 and image-side surface S2 are both equivalent to planes. The first lens E1 has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex. The second lens E2 has negative optical power, and its object-side surface S5 and image-side surface S6 are both concave. The third lens E3 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex. The fourth lens E4 has positive optical power, and its object-side surface S9 and image-side surface S10 are both convex. The fifth lens E5 has negative optical power, and its object-side surface S11 and image-side surface S12 are both concave. The sixth lens E6 has positive optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex. The seventh lens E7 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex; the eighth lens E8 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex; the ninth lens E9 has positive optical power, with its object-side surface S19 being convex and its image-side surface S20 being concave. Light from the object passes sequentially through the surfaces S1 to S20 of each lens and is finally imaged on the imaging surface S23. S21 and S22 are the two surfaces of the protective glass or filter, OBJ (not shown in the figure) is the object surface, and STO is the aperture stop, which is positioned between the second lens E2 and the third lens E3.

[0196] Table 9 below shows the basic optical parameters of the optical zoom lens of Embodiment 5. Specifically, Table 9-1 lists the relevant parameters of each lens in the optical zoom lens of this embodiment, including: surface type, radius of curvature, thickness / distance, refractive index of the material, Abbe number, and conic coefficient. The units of radius of curvature and thickness are millimeters (mm). Table 9-2 lists the relevant parameters of the optical zoom lens of this embodiment in Z1 mode, Table 9-3 lists the relevant parameters of the optical zoom lens of this embodiment in Z2 mode, and Table 9-4 lists the relevant parameters of the optical zoom lens of this embodiment in Z3 mode.

[0197]

[0198] Table 9-1

[0199]

[0200] Table 9-2

[0201]

[0202] Table 9-3

[0203]

[0204] Table 9-4

[0205] Table 10 lists the aspherical coefficients of each aspherical lens in the optical zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0206]

[0207] Table 10

[0208] The optical parameters of the optical zoom lens in Example 5 are shown in Table 13 below, and the values ​​of each conditional expression are shown in Table 14 below.

[0209] Figure 51 (a) Figure 55 (a) Figure 59 (a) shows the on-axis chromatic aberration curves of the optical zoom lens of Example 5 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 52 (a) Figure 56 (a) Figure 60 (a) shows the on-axis chromatic aberration curves of the optical zoom lens in Example 5 at an object distance of 300 mm in Z1, Z2, and Z3 modes. Figure 51 (b) Figure 55 (b) Figure 59 (b) shows the astigmatism curves of the optical zoom lens of Embodiment 5 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 52 (b) Figure 56 (b) Figure 60 (b) shows the astigmatism curves of the optical zoom lens in Example 5 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 51 (c) Figure 55 (c) Figure 59 (c) shows the distortion curves of the optical zoom lens of Embodiment 5 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 52 (c) Figure 56 (c) Figure 60 (c) shows the distortion curves of the optical zoom lens in Embodiment 5 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 51 (d) Figure 55 (d) Figure 59 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 5 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 52 (d) Figure 56 (d) Figure 60 (d) shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment 5 at an object distance of 300mm in modes Z1, Z2, and Z3. The meanings of the axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve are the same as in Embodiment 1 and will not be repeated here. Figure 51 , 52 As can be seen from 55, 56, 59, and 60, the on-axis chromatic aberration, astigmatism, distortion, and rate-chromatic aberration are well controlled, and the optical zoom lens given in Example 5 can achieve good imaging quality.

[0210] Example 6

[0211] like Figures 61 to 72 As shown, the optical zoom lens includes an optical element G arranged sequentially from the object side to the image side along the optical axis, a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power. The first lens group includes a first lens E1 and a second lens E2 arranged sequentially from the object side to the image side along the optical axis. The second lens group includes a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6 arranged sequentially from the object side to the image side along the optical axis. The third lens group includes a seventh lens E7, an eighth lens E8, and a ninth lens E9 arranged sequentially from the object side to the image side along the optical axis.

[0212] In this system, optical element G is an equilateral right-angled triangular prism used to bend the light path by 90°, and its object-side surface S1 and image-side surface S2 are both equivalent to planes. The first lens E1 has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex. The second lens E2 has negative optical power, and its object-side surface S5 and image-side surface S6 are both concave. The third lens E3 has positive optical power, and its object-side surface S7 and image-side surface S8 are both convex. The fourth lens E4 has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The fifth lens E5 has negative optical power, and its object-side surface S11 and image-side surface S12 are both concave. The sixth lens E6 has positive optical power, its object-side surface S13 is concave, and its image-side surface S14 is convex. The seventh lens E7 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex; the eighth lens E8 has positive optical power, with its object-side surface S17 being concave and its image-side surface S18 being convex; the ninth lens E9 has negative optical power, with its object-side surface S19 being convex and its image-side surface S20 being concave. Light from the object passes sequentially through the surfaces S1 to S20 of each lens and is finally imaged on the imaging surface S23. Here, S21 and S22 are the two surfaces of the protective glass or filter, OBJ (not shown in the figure) is the object surface, and STO is the aperture stop, which is located between the second lens E2 and the third lens E3.

[0213] Table 11 below shows the basic optical parameters of the optical zoom lens of Embodiment Six. Specifically, Table 11-1 lists the relevant parameters of each lens in the optical zoom lens of this embodiment, including: surface type, radius of curvature, thickness / distance, refractive index of the material, Abbe number, and conic coefficient. The units of radius of curvature and thickness are millimeters (mm). Table 11-2 lists the relevant parameters of the optical zoom lens of this embodiment in Z1 mode, Table 11-3 lists the relevant parameters of the optical zoom lens of this embodiment in Z2 mode, and Table 11-4 lists the relevant parameters of the optical zoom lens of this embodiment in Z3 mode.

[0214]

[0215] Table 11-1

[0216]

[0217] Table 11-2

[0218]

[0219] Table 11-3

[0220]

[0221] Table 11-4

[0222] Table 12 lists the aspherical coefficients of each aspherical lens in the optical zoom lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0223]

[0224] Table 12

[0225] The optical parameters of the optical zoom lens in Example 6 are shown in Table 13 below, and the values ​​of each conditional expression are shown in Table 14 below.

[0226] Figure 63 (a) Figure 67 (a) Figure 71 (a) shows the on-axis chromatic aberration curves of the optical zoom lens of Example 6 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 64 (a) Figure 68 (a) Figure 72 (a) shows the on-axis chromatic aberration curves of the optical zoom lens in Example 6 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 63 (b) Figure 67 (b) Figure 71 (b) shows the astigmatism curves of the optical zoom lens of Embodiment 6 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 64 (b) Figure 68 (b) Figure 72 (b) shows the astigmatism curves of the optical zoom lens in Example 6 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 63 (c) Figure 67 (c) Figure 71 (c) shows the distortion curves of the optical zoom lens of Embodiment 6 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 64 (c) Figure 68 (c) Figure 72 (c) shows the distortion curves of the optical zoom lens of Example 6 at an object distance of 300mm in Z1, Z2, and Z3 modes. Figure 63 (d) Figure 67 (d) Figure 71(d) shows the magnification chromatic aberration curves of the optical zoom lens of Example 6 when the object distance is infinite in modes Z1, Z2, and Z3. Figure 64 (d) Figure 68 (d) Figure 72 (d) Shows the magnification chromatic aberration curves of the optical zoom lens in Embodiment Six at an object distance of 300mm in Z1, Z2, and Z3 modes. The meanings of the axial chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve are the same as in Embodiment One and will not be repeated here. Figure 63 , 64 As can be seen from 67, 68, 71, and 72, the on-axis chromatic aberration, astigmatism, distortion, and rate-chromatic aberration are well controlled, and the optical zoom lens given in Example 6 can achieve good imaging quality.

[0227] In summary, the optical parameters of the optical zoom lenses in Examples 1 to 6 are shown in Table 13 below.

[0228]

[0229] Table 13

[0230] The optical zoom lenses in Examples 1 to 6 satisfy the relationships shown in Table 14.

[0231]

[0232] Table 14

[0233] 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. An optical zoom lens, characterized in that, The optical zoom lens comprises three lens groups arranged sequentially along the optical axis from the object side to the image side: a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with negative optical power, totaling three lens groups with optical power. The second lens group is a zoom group, and the third lens group is a focusing group. The first lens group is fixed in position, while the second and third lens groups move along the optical axis. Specifically, the second lens group moves from the object side to the image side, changing the focal length of the optical zoom lens from short to long. The third lens group moves from the object side to the image side, switching the object distance of the optical zoom lens from infinity to macro. The first lens group includes two lenses with optical power arranged sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, whose image side is convex; and a second lens with negative optical power, whose object side is concave. The second lens group includes four lenses with optical power arranged sequentially from the object side to the image side along the optical axis: a third lens with positive optical power, whose image side is convex; a fourth lens with positive optical power; a fifth lens with negative optical power, whose image side is concave; and a sixth lens with positive optical power, whose object side is concave and whose image side is convex. The third lens group includes three lenses with optical power arranged sequentially from the object side to the image side along the optical axis: a seventh lens with negative optical power, whose object side is concave and whose image side is convex; an eighth lens with positive optical power, whose object side is concave and whose image side is convex; and a ninth lens with optical power, whose object side is convex and whose image side is concave. The optical zoom lens satisfies: -3.05 < f12 / f3456 < -2.56; -3.10 < f789 / R18 < -2.55; Wherein, f12 is the combined focal length of the first lens and the second lens, f3456 is the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens; f789 is the combined focal length of the seventh lens, the eighth lens and the ninth lens, and R18 is the radius of curvature of the image side surface of the ninth lens.

2. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens includes multiple zoom modes; the optical zoom lens meets the following requirements: 13.2mm. <fmax-fmin<14.2mm; Wherein, fmax is the maximum effective focal length of the optical zoom lens during the zoom process, and fmin is the minimum effective focal length of the optical zoom lens during the zoom process.

3. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies the following condition: -18.80 < f12 / (CT1+CT2) < -13.50; Where f12 is the combined focal length of the first lens and the second lens, CT1 is the center thickness of the first lens, and CT2 is the center thickness of the second lens.

4. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies the following condition: 1.80 < CT3 / SAG31 < 2.15; Wherein, CT3 is the center thickness of the third lens on the optical axis, and SAG31 is the on-axis displacement between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the optical region on the object side surface of the third lens.

5. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies: 3.95 < T78 / T89 < 38.90; Wherein, T78 is the air gap between the seventh lens and the eighth lens on the optical axis, and T89 is the air gap between the eighth lens and the ninth lens on the optical axis.

6. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies the following condition: -5.45 < R2 / f1 < -0.64; Where R2 is the radius of curvature of the image side of the first lens, and f1 is the effective focal length of the first lens.

7. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies: 1.19 < f2 * N2 / R3 < 2.10; Where f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, and R3 is the radius of curvature of the object side surface of the second lens.

8. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies: 2.28 < (R6 - R5) / (R6 + R5) < 3.05; Wherein, R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens.

9. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies the following condition: 1.00 < f4 / f3 < 1.61; Where f3 is the effective focal length of the third lens and f4 is the effective focal length of the fourth lens.

10. The optical zoom lens according to claim 1, characterized in that, The optical zoom lens satisfies the following condition: -2.40 < f5*N5 / R10 < -0.50; Where f5 is the effective focal length of the fifth lens, N5 is the refractive index of the fifth lens, and R10 is the radius of curvature of the image-side surface of the fifth lens.

Images