Zoom lens and camera module

Abstract

The embodiment of the application relates to the field of zoom lenses, and provides a zoom lens and a camera module, the zoom lens comprising a first lens group, a second lens group, a third lens group and a fourth lens group arranged from an object side to an image side, the second lens group having a negative refractive power, the first lens group, the third lens group and the fourth lens group all having a positive refractive power; the first lens group comprising at least one lens, the second lens group comprising at least four lenses, the third lens group comprising at least eight lenses, and the fourth lens group comprising one lens; the second lens group and the third lens group being capable of moving along the optical axis of the zoom lens relative to the first lens group to enable the zoom lens to perform zooming and focusing between a wide-angle end and a telephoto end; the second lens group comprising a first moving lens and a second moving lens, the second moving lens being capable of moving relative to the first moving lens to realize focusing of the zoom lens. The zoom lens achieves the purposes of giving consideration to rapid focusing, high sealing performance, small size and high imaging quality.

Description

Technical Field

[0001] This application relates to the field of zoom lens technology, and more particularly to a zoom lens and camera module. Background Technology

[0002] With the widespread use of cameras, higher demands are being placed on lenses. Travel and street photography scenarios require greater lens portability, making compact lenses the ideal choice for "all-in-one" solutions. This widespread demand for compact lenses has led to the development of retractable lenses, a trend towards smaller sizes. Retractable lenses can reduce lens size to a certain extent while maintaining image quality. However, retractable lenses also have some unavoidable problems: for example, the gaps created by the retractable structure are a major channel for dust to enter, especially in low-temperature, windy, and dusty environments. Furthermore, it is difficult to completely seal these gaps, making them ineffective against rain and moisture. Summary of the Invention

[0003] The embodiments of this application provide a zoom lens and camera module that can effectively balance fast focusing, high sealing performance, miniaturization, and high image quality.

[0004] To achieve the above objectives, the embodiments of this application adopt the following technical solutions: In a first aspect, embodiments of this application provide a zoom lens, including a first lens group, a second lens group, a third lens group, and a fourth lens group arranged from the object side to the image side. The second lens group has negative optical power, while the first, third, and fourth lens groups all have positive optical power. The first lens group includes at least one lens, the second lens group includes at least four lenses, the third lens group includes at least seven lenses, and the fourth lens group includes one lens. Both the second and third lens groups are movable relative to the first lens group along the optical axis of the zoom lens to enable the zoom lens to perform zoom focusing between a wide-angle end and a telephoto end. The second lens group includes a first movable mirror and a second movable mirror, the second movable mirror being movable relative to the first movable mirror to achieve focusing of the zoom lens.

[0005] In some feasible implementations, the second lens group and the third lens group are linked to enable the zoom lens to perform zoom focusing between the wide-angle end and the telephoto end.

[0006] In some possible implementations, the third lens group includes a first compensation group and a second compensation group arranged from the object side to the image side, the second lens group, the first compensation group, and the second compensation group being linked to enable the zoom lens to perform zoom focusing between the wide-angle end and the telephoto end; wherein, when the zoom lens moves from the wide-angle end to the medium focal length end, the second lens group moves from the object side to the image side; when the zoom lens moves from the medium focal length end to the telephoto end, it moves from the image side to the object side; when the zoom lens moves from the wide-angle end to the medium focal length end and then to the telephoto end, the first compensation group moves unidirectionally from the image side to the object side, and the second compensation group moves unidirectionally from the image side to the object side; and / or, the first compensation group has positive optical power, the second compensation group has negative optical power, and the second compensation group includes one of the lenses.

[0007] In some feasible implementations, the zoom lens satisfies the relationship: -1.2 ≤ f² / f 3 w ≤-0.8; where f2 is the focal length of the second lens group when focused at infinity; f 3w The combined focal length of the third lens group at the wide-angle end is given.

[0008] In some feasible implementations, the zoom lens satisfies the relationship: -1.3 ≤ f² / f 3 T ≤-0.95; where f2 is the focal length of the second lens group when focused at infinity; f 3T The combined focal length of the third lens group at the telephoto end is given.

[0009] In some feasible implementations, the zoom lens satisfies the relationship: 7.2 ≥ f1 / f T ≥3.6; where f1 is the focal length of the first lens group; f T The focal length of the zoom lens at the telephoto end is given.

[0010] In some feasible implementations, the zoom lens satisfies the relation: 5.3 ≥ f af / f2≥3.95; where f af f1 is the focal length of the second moving mirror; f2 is the focal length of the second lens group when it is focused at infinity.

[0011] In some feasible implementations, the zoom lens satisfies the relationship: 5.8 ≥ f TG32G4 / f wG32G4 ≥2.85; where f TG32G4 f is the combined focal length of the second compensation group and the fourth lens group when the zoom lens is at the telephoto end; wG32G4 The focal length of the zoom lens at the wide-angle end is the combined focal length of the second compensation group and the fourth lens group.

[0012] In some feasible implementations, the zoom lens satisfies the relationship: 1.2 ≥ BFL / H 1 / 2Y ≥0.8; where: BFL is the back focal length of the zoom lens; H 1 / 2Y This is the half-image height of the zoom lens.

[0013] In some possible implementations, the zoom lens includes a first target lens, the refractive index Nd1 and Abbe number Vd1 of the first target lens satisfying the following relationships: 1.65≥Nd1≥1.42; 95≥Vd1≥62; and / or, the zoom lens includes a second target lens, the refractive index Nd2 and Abbe number Vd2 of the second target lens satisfying the following relationships: 2.00≥Nd2≥1.83; 32≥Vd2≥18.

[0014] In some possible implementations, the zoom ratio of the zoom lens is greater than or equal to 2.5; and / or, the field of view of the zoom lens at the telephoto end is less than or equal to 31°; and the field of view of the zoom lens at the wide-angle end is greater than or equal to 83°.

[0015] In some feasible implementations, an aperture stop is also included, which is disposed in the third lens group and located after the lens at the first position in the direction from the object side to the image side.

[0016] Secondly, embodiments of this application provide a camera module, including the zoom lens and photosensitive element described in the first aspect, wherein the photosensitive element is disposed on the image side of the zoom lens.

[0017] The zoom lens provided in this application embodiment achieves focusing by moving the second movable mirror in the second lens group relative to the first movable mirror. Compared to focusing across the entire lens group, this internal focusing method not only dynamically compensates for aberrations caused by changes in object distance, ensuring that the zoom lens maintains near-peak resolution and sharpness from infinity to the closest focusing point, thus achieving high image quality across the entire focusing distance; but also, through precise adjustment of the relative positions of the first and second movable mirrors within the second lens group, it significantly suppresses the "focus breathing" effect, which is crucial for modern film and video production; simultaneously, it indirectly reduces the focusing load, allowing the motor to drive at higher acceleration, thereby achieving… Firstly, it offers faster autofocus speed; secondly, it facilitates a shorter minimum focusing distance, expanding the close-up capabilities of zoom lenses and thus improving image quality; thirdly, this internal focusing design allows zoom lenses to fully utilize the distance between lens groups for both zoom and focus. Furthermore, the first and fourth lens groups remain relatively fixed during both focusing and zoom adjustment. This not only minimizes the overall optical length of the zoom lens, facilitating miniaturization, but also allows for a completely sealed, rigid structure for the first and fourth lens groups, enabling the installation of dust- and splash-proof sealing rings at the interface, improving sealing performance and significantly enhancing the outdoor durability of the zoom lens. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the zoom lens at the mid-telephoto end provided in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 1 of this application; Figure 4 This is the MTH diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of this application; Figure 5 This is the MTH diagram of the zoom lens at the mid-telephoto end provided in Embodiment 1 of this application; Figure 6 This is the MTH diagram of the zoom lens at the telephoto end provided in Embodiment 1 of this application; Figure 7 This is a distortion image of the zoom lens at the wide-angle end provided in Embodiment 1 of this application; Figure 8 This is a distortion image of the zoom lens at the mid-telephoto end provided in Embodiment 1 of this application; Figure 9 This is a distortion image of the zoom lens at the telephoto end provided in Embodiment 1 of this application; Figure 10This is the axial chromatic aberration diagram of the zoom lens at the wide-angle end provided in Embodiment 1 of this application; Figure 11 This is the axial chromatic aberration diagram of the zoom lens at the mid-telephoto end provided in Embodiment 1 of this application; Figure 12 This is the axial chromatic aberration diagram of the zoom lens at the telephoto end provided in Embodiment 1 of this application; Figure 13 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of this application; Figure 14 This is a schematic diagram of the zoom lens at the mid-telephoto end provided in Embodiment 2 of this application; Figure 15 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 2 of this application; Figure 16 This is the MTH diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of this application; Figure 17 This is the MTH diagram of the zoom lens at the mid-telephoto end provided in Embodiment 2 of this application; Figure 18 This is the MTH diagram of the zoom lens at the telephoto end provided in Embodiment 2 of this application; Figure 19 This is a distortion image of the zoom lens at the wide-angle end provided in Embodiment 2 of this application; Figure 20 This is a distortion image of the zoom lens at the mid-telephoto end provided in Embodiment 2 of this application; Figure 21 This is a distortion image of the zoom lens at the telephoto end provided in Embodiment 2 of this application; Figure 22 This is the axial chromatic aberration diagram of the zoom lens at the wide-angle end provided in Embodiment 2 of this application; Figure 23 This is the axial chromatic aberration diagram of the zoom lens at the mid-focal end provided in Embodiment 2 of this application; Figure 24 This is the axial chromatic aberration diagram of the zoom lens at the telephoto end provided in Embodiment 2 of this application; Figure 25 This is a schematic diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of this application; Figure 26 This is a schematic diagram of the zoom lens at the mid-telephoto end provided in Embodiment 3 of this application; Figure 27 This is a schematic diagram of the zoom lens at the telephoto end provided in Embodiment 3 of this application; Figure 28 This is the MTH diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of this application; Figure 29This is the MTH diagram of the zoom lens at the mid-telephoto end provided in Embodiment 3 of this application; Figure 30 This is the MTH diagram of the zoom lens at the telephoto end provided in Embodiment 3 of this application; Figure 31 This is a distortion image of the zoom lens at the wide-angle end provided in Embodiment 3 of this application; Figure 32 This is a distortion image of the zoom lens at the mid-telephoto end provided in Embodiment 3 of this application; Figure 33 This is a distortion image of the zoom lens at the telephoto end provided in Embodiment 3 of this application; Figure 34 This is the axial chromatic aberration diagram of the zoom lens at the wide-angle end provided in Embodiment 3 of this application; Figure 35 This is the axial chromatic aberration diagram of the zoom lens at the mid-focal end provided in Embodiment 3 of this application; Figure 36 This is the axial chromatic aberration diagram of the zoom lens at the telephoto end provided in Embodiment 3 of this application.

[0019] The following are the labeling elements in the figure: First lens group G1; Second lens group G2; Third lens group G3; First compensation group G31; Second compensation group G32; Fourth lens group G4; First lens L1; Second lens L2; ​​Third lens L3; Fourth lens L4; Fifth lens L5; Sixth lens L6; Seventh lens L7; Eighth lens L8; Ninth lens L9; Tenth lens L10; Eleventh lens L11; Twelfth lens L12; Thirteenth lens L13; Fourteenth lens L14; Fifteenth lens L15; Aperture stop STO; Imaging plane IMAGE; Protective film CG. Detailed Implementation

[0020] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0021] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of a zoom lens to deflect light.

[0022] A lens or lens group with positive optical power, having a positive focal length, and having the effect of converging light.

[0023] A lens or lens group with negative optical power has a negative focal length and has the effect of diverging light.

[0024] Focal length, also known as focal length, is a measure of how well light converges or diverges in a lens. It refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when a distant object is focused into a sharp image. For prime lenses, the position of their optical center remains constant; for telephoto lenses, changes in the optical center result in changes in the focal length.

[0025] The effective focal length (EFL) of a lens refers to the distance from the center of the lens to the focal point.

[0026] The composite focal length is the combination of the focal lengths of the individual lenses in the lens group.

[0027] The object side is defined by the lens; the side where the object is located is called the object side, and the surface of the lens closest to the object side is called the object side surface.

[0028] The image side is the side on which the image of the subject is located, with the lens as the boundary. The surface of the lens closest to the image side is called the image side surface.

[0029] An aperture diaphragm is a device used to control the amount of light passing through the lens and entering the sensor inside the camera body; it is usually located inside the lens.

[0030] The imaging plane is located on the image side of all the lenses in the lens, and is the plane on which the image is formed after light passes through each lens in sequence.

[0031] The optical axis is a vertical axis that passes through the center of a lens. The lens optical axis is the axis that passes through the centers of each lens in the lens.

[0032] The focal point is the point where parallel light rays converge after being refracted by a lens or lens group.

[0033] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0034] Aberrations are the properties of a lens as an ideal optical system at the optical axis. A near-axis ray emitted from a point on an object intersects the image plane at a single point (i.e., the optical axis image point). However, in reality, light rays passing through different apertures of the lens rarely intersect perfectly at a single point. Instead, they deviate from the position of the near-axis image point. These differences are collectively referred to as aberrations.

[0035] Distortion, also known as image distortion, refers to the degree of distortion of the image formed by a lens relative to the object itself. Distortion is caused by the spherical aberration of the aperture. The height of the intersection point between the principal ray and the Gaussian image plane after passing through the lens in different fields of view is not equal to the ideal image height; the difference between the two is distortion.

[0036] 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 embodiments of this application, and not all embodiments. 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.

[0037] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0038] like Figure 1 As shown in the figure, this application embodiment provides a camera module, which includes a zoom lens and a photosensitive element (not shown in the figure), with the photosensitive element located on the image side of the zoom lens.

[0039] The working principle of this camera module is as follows: the light reflected from the subject passes through the zoom lens to generate an optical image, which is then projected onto the photosensitive surface of the photosensitive element. The photosensitive element converts the optical image into an electrical signal, i.e., an analog image signal, and transmits it to the processor.

[0040] Among them, the photosensitive element (also known as the image sensor) is located in, for example, Figure 1 The image sensor on the far right (IMAGE) is a semiconductor chip containing hundreds of thousands to millions of photodiodes that generate electrical charges when illuminated. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device. A CCD is made of a highly sensitive semiconductor material that converts light into electrical charges. A CCD consists of many photosensitive units, typically measured in megapixels. When light illuminates the surface of the photosensitive element, each photosensitive unit reflects a charge onto the component; the signals from all the photosensitive units are added together to form a complete image.

[0041] Among them, a lens is an optical lens that mainly uses the refraction principle of lenses to form an image. That is, when light from a scene passes through the zoom lens, the magnification is achieved by moving part of the lens group, and a clear image is formed on the focal plane within different object distances. The image of the scene is then recorded by a photosensitive element located on the focal plane.

[0042] like Figure 1 As shown, a protective film (CG) is usually provided on the photosensitive element. This serves to support and protect the photosensitive element.

[0043] like Figure 1 As shown in the illustration, this application provides a zoom lens comprising a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 arranged from the object side to the image side. The second lens group G2 has negative optical power, while the first lens group G1, the third lens group G3, and the fourth lens group G4 all have positive optical power. The first lens group G1 includes at least one lens, the second lens group G2 includes at least four lenses, the third lens group G3 includes at least seven lenses, and the fourth lens group G4 includes one lens. In other words, this zoom lens includes at least 13 lenses.

[0044] It should be noted that the aforementioned second moving mirror can be, but is not limited to, a single lens. This further reduces the motor load, thereby improving focusing speed and efficiency.

[0045] The first lens group G1 and the fourth lens group G4 are relatively fixed and can be called fixed lens groups. The second lens group G2 and the third lens group G3 can both move relative to the first lens group G1 along the optical axis of the zoom lens so that the zoom lens can perform zoom focusing between the wide-angle end and the telephoto end.

[0046] The second lens group G2, also known as the zoom group, and the third lens group G3, also known as the compensation group, can be linked, but not limited to, along the optical axis of the lens, to move the lens between the wide-angle and telephoto ends to achieve zoom focusing. This further improves zoom speed and efficiency. Simultaneously, the second lens group G2 includes a first moving mirror and a second moving mirror. The second moving mirror can move relative to the first moving mirror to achieve focusing of the zoom lens. Thus, the zoom lens achieves focusing through an internal focusing method.

[0047] If the zoom lens uses a single focusing group, then either the first lens group G1 or the fourth lens group G4 is the focusing group. During focusing, the overall optical length increases, leading to a larger overall length for the zoom lens, which is detrimental to a compact design. Furthermore, in windy and sandy environments, it's difficult to achieve a completely sealed zoom lens, making it less resistant to rain and moisture. Additionally, with a single focusing group, the zoom lens's focusing performance differs at the wide-angle, mid-range, and telephoto ends.

[0048] The zoom lens provided in this application embodiment achieves focusing by moving the second movable mirror in the second lens group G2 relative to the first movable mirror. Compared to focusing across the entire lens group, this internal focusing method not only dynamically compensates for aberrations caused by changes in object distance, ensuring that the zoom lens maintains near-peak resolution and sharpness from infinity to the closest focusing point, but also maintains constant image quality throughout the zoom range, thus achieving high image quality at all focusing distances. Furthermore, this precise adjustment of the relative positions of the first and second movable mirrors within the second lens group G2 balances the principal point position while changing the optical power, maximizing the stability of the image's angle of view and composition. This significantly suppresses the "focus breathing" effect, which is crucial for modern film and video production and a core selling point for cinema lenses and high-end mirrorless lenses. Simultaneously, it indirectly reduces... The improved focusing load allows the motor to drive at higher acceleration, resulting in faster autofocus. Secondly, it facilitates a shorter minimum focusing distance, expanding the zoom lens's close-up capabilities and improving image quality. Furthermore, this internal focusing design allows the zoom lens to fully utilize the distance between lens groups, eliminating the need for secondary focusing at the same focal length, enabling zoom and focus adjustments. Simultaneously, during both focusing and zoom adjustments, the first lens group G1 and the fourth lens group G4 remain relatively fixed. This not only minimizes the overall optical length of the zoom lens, facilitating miniaturization, but also allows for a completely sealed, rigid structure for the first lens group G1 and the fourth lens group G4, enabling the installation of dust-proof and splash-proof sealing rings at the interface, improving sealing performance and significantly enhancing the zoom lens's outdoor durability.

[0049] The second lens group G2 has negative optical power, while the first lens group G1, the third lens group G3, and the fourth lens group G4 all have positive optical power.

[0050] By properly allocating the optical power of each lens group in a zoom lens, aberrations can be effectively corrected, thereby improving image quality.

[0051] In some feasible implementations, the third lens group G3 includes a first compensation group G31 and a second compensation group G32 arranged from the object side to the image side, and the second lens group G2, the first compensation group G31 and the second compensation group G32 are linked to enable the zoom lens to perform zoom focusing between the wide-angle end and the telephoto end.

[0052] Specifically, when the zoom lens moves from the wide-angle end to the medium-focal end, the second lens group G2 moves from the object side to the image side; when the zoom lens moves from the medium-focal end to the telephoto end, it moves from the image side to the object side; when the zoom lens moves from the wide-angle end to the medium-focal end and then to the telephoto end, the first compensation group G31 moves unidirectionally from the image side to the object side, and the second compensation group G32 moves unidirectionally from the image side to the object side.

[0053] In other words, the zoom lens achieves zoom focusing through three sets of linkages, thus enabling the zoom lens to achieve a large zoom ratio.

[0054] In some feasible implementations, an aperture stop STO is also included, which is located in the third lens group G3, behind the lens in the first position in the direction from the object side to the image side.

[0055] refer to Figure 1 The stop STO is located in the third lens group G3, in the first position of the lens from the object side to the image side, that is, after the seventh lens L7 and between the eighth lens L8. Of course, the stop STO can also be located in the third lens group G3, in the second or third position of the lens from the object side to the image side, that is, after the eighth lens L8 or the ninth lens L9, without being specifically limited here.

[0056] In some feasible implementations, the first compensation group G31 has positive optical power, and the second compensation group G32 has negative optical power, the second compensation group G32 comprising a lens. (Reference) Figure 1 The first lens group G1 includes a first lens L1 and a second lens L2. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. In the second lens group G2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all first movable mirrors, and the sixth lens L6 is a second movable mirror. The aforementioned second movable mirror is... Figure 1 The sixth lens L6 in the image can be a meniscus lens.

[0057] The aforementioned negative meniscus lens is thicker at the edges than at the center. Its concave curvature is greater than its convex curvature, thus causing light to diverge. The working principle of this negative meniscus lens is achieved by carefully designing the curvature of its two spherical surfaces, causing light to be refracted uniformly on both surfaces of the lens, thereby minimizing spherical aberration. It is often used to replace other types of negative lenses, significantly reducing spherical aberration and thus playing a role in balancing aberrations in zoom lenses.

[0058] The second moving mirror mentioned above is a focusing mirror, also known as a focusing lens. In a focusing lens, the above setting can effectively compensate for various aberrations from infinity to the closest focal length, i.e., macro photography. In particular, it can effectively correct the field curvature when focusing at the minimum distance during close-up photography, ensuring high image quality throughout.

[0059] In some feasible ways, the first lens L1 and the second lens L2 are cemented together to form a cemented lens.

[0060] The above-mentioned cemented lens is formed by cementing two or three lenses together.

[0061] The first lens group G1 includes a cemented lens element, which can not only reasonably correct the chromatic aberration of the zoom lens, but also reduce the tolerance sensitivity of the zoom lens and effectively improve the overall image quality of the zoom lens.

[0062] like Figures 1 to 3 The diagrams show the structure of the zoom lens in Embodiment 1 of this application at infinity, at the wide-angle end, the mid-range end, and the telephoto end. The zoom lens includes a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 arranged from the object side to the image side. The second lens group G2 has negative optical power, while the first lens group G1, the third lens group G3, and the fourth lens group G4 all have positive optical power. The first lens group G1 includes a first lens L1 and a second lens L2. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The third lens group G3 includes a first compensation group G31 and a second compensation group G32 arranged from the object side to the image side. The first compensation group G31 includes a seventh lens L7, an aperture stop STO, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. The second compensation group G32 includes a fourteenth lens L14. The fourth lens group G4 includes a fifteenth lens L15. In the second lens group G2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all first movable mirrors, and the sixth lens L6 is the second movable mirror.

[0063] The first lens L1 and the second lens L2 are cemented together to form a cemented lens, and the ninth lens L9 and the tenth lens L10 are cemented together to form a cemented lens.

[0064] The first lens group G1 and the fourth lens group G4 are relatively fixed. The second lens group G2, the first compensation group G31, and the second compensation group G32 are linked to enable the zoom lens to perform zoom focusing between the wide-angle end and the telephoto end. Specifically, when the zoom lens moves from the wide-angle end to the medium telephoto end, the second lens group G2 moves from the object side to the image side; when the zoom lens moves from the medium telephoto end to the telephoto end, it moves from the image side to the object side; when the zoom lens moves from the wide-angle end to the medium telephoto end and then to the telephoto end, the first compensation group G31 moves unidirectionally from the image side to the object side, and the second compensation group G32 moves unidirectionally from the image side to the object side. The second moving mirror can move relative to the first moving mirror, enabling the zoom lens to autofocus and form a clear image between focusing at infinity and the closest focal length.

[0065] Tables 1a to 1f respectively provide the specific parameter values ​​of each lens of the zoom lens in an optional embodiment of Embodiment 1 of this application.

[0066]

[0067] It should be noted that in Table 1a, "Surface Number" refers to the number of each surface arranged sequentially from the object side to the image side. The radius R value is the lens corresponding to the surface number, that is, the radius of curvature of the object side or image side of the lens corresponding to each surface number at the optical axis. "Infinite" in the "Radius of Curvature" parameter series means that the object side or image side of the lens is a plane. The value of each lens in the "Thickness / Spacing" parameter series is the thickness of the lens on the optical axis. The value of the stop STO in the "Thickness" parameter series is the distance on the optical axis from the center of the stop STO to the object side of the next lens. "IMAGE" refers to the imaging plane of the zoom lens, which in this embodiment refers to... Figure 1 The rightmost imaging plane of the zoom lens shown.

[0068] In Table 1a, the value of "Aperture Stop STO" at the thickness represents the distance between aperture stop STO and the eighth lens L8; the value of "S3" at the thickness, "D1", represents the distance between the second lens L2 and the third lens L3, i.e., the distance between the first lens group G1 and the second lens group G2; the value of "S14" at the thickness, "D2", represents the distance between the sixth lens L6 and the seventh lens L7, i.e., the distance between the second lens group G2 and the third lens group G3. The value of "S130" at the thickness, "D3", represents the distance between the first compensation group G31 and the second compensation group G32; the value of "S32" at the thickness, "D4", represents the distance between the second compensation group G32 and the fourth lens group G4. When the zoom lens zooms between the wide-angle and telephoto ends, "D1", "D2", "D3", and "D4" in Table 1a will change. When the zoom lens focuses clearly at infinity and the closest focal length, "B1" and "B2" will change at different object distances. The variable parameters of “D1”, “D2”, “D3” and “D14” in Table 1a at different magnifications, and the variable interval parameters of “B1” and “B2” at different object distances are shown in Table 1b.

[0069]

[0070] In this embodiment, S15, S16, S33, and S34 in Table 1a are aspherical surfaces. The aspherical surface shape of the above-mentioned aspherical lens satisfies the following conditions:

[0071] Where c is the curvature corresponding to the radius of curvature R, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic coefficient (when k is less than -1, the surface curve is a hyperbola; when k is equal to -1, it is a parabola; when k is between -1 and 0, it is an ellipse; when k is equal to 0, it is a circle; and when k is greater than 0, it is an oval), and A4, A6, A8, A10, A12, and A14 are higher-order aspheric coefficients. The definition of aspheric surface shape will not be elaborated below.

[0072] Table 1c below shows the aspherical data for the conic coefficient and higher-order aspherical coefficient of the aspherical lens in this embodiment.

[0073]

[0074] The parameters of the zoom lens in Example 1 satisfy the relationship shown in Table 1d.

[0075]

[0076] Note: The following annotations explain the relationships between the zoom lenses in the various embodiments: f T This refers to the focal length of the zoom lens at the telephoto end. BFL is the back focal length of the zoom lens; H 1 / 2Y The half-image height of a zoom lens; f1 is the focal length of the first lens group G1; f2 is the focal length of the second lens group G2; f 3T This is the combined focal length of the third lens group G3 at the telephoto end; f TG32G4 The combined focal length of the second compensation group G32 and the fourth lens group G4 when the zoom lens is at the telephoto end; wG32G4 The combined focal length of the second compensation group G32 and the fourth lens group G4 when the zoom lens is at the wide-angle end; f af The focal length of the second moving mirror; the focal length of the sixth lens L6 in this embodiment; Nd1 is the refractive index of the first target lens; Vd1 is the Abbe number of the first target lens; Nd2 is the refractive index of the second target lens; Vd2 is the Abbe number of the second target lens.

[0077] It should be noted that, in this embodiment, the lenses in the first lens group G1, the first lens L1, the second lens L2, and the last lens in the second lens group G2, namely the sixth lens L6; the second lens in the third lens group G3, namely the eighth lens L8, and the second to last lens in the first compensation lens group G31 in the third lens group G3, namely the twelfth lens L12, are all the first target lenses.

[0078] In this embodiment, the third lens in the second lens group G2, namely the fifth lens L5, and the last lens in the first compensation lens group G31 in the third lens group G3, namely the thirteenth lens L13, are both the second target lenses.

[0079] The positive and negative values ​​of the optical power of each lens in the zoom lens of Example 1 are shown in Table 1e.

[0080]

[0081] It should be noted that the "+" and "-" in Table 1e represent the positive and negative optical power of each lens in the zoom lens of Example 1. "+" indicates that the lens has positive optical power; "-" indicates that the lens has negative optical power.

[0082] The concavity or convexity of the object side or image side of each lens in the zoom lens of Embodiment 1 at the optical axis is shown in Table 1f.

[0083]

[0084] It should be noted that in Table 1f, “++”, “+-”, “-+”, and “--” represent the concavity or convexity of the object-side or image-side of each lens at the optical axis. Specifically, “++” indicates that both the object-side and image-side of the lens are convex towards the object at the optical axis, meaning the lens is a meniscus lens that convex towards the object; “+-” indicates that both the object-side and image-side of the lens are convex towards the object at the optical axis, meaning it is a biconvex lens; “-+” indicates that both the object-side and image-side of the lens are concave towards the object at the optical axis, meaning it is a biconcave lens; and “--” indicates that both the object-side and image-side of the lens are concave towards the object at the optical axis, meaning it is a meniscus lens that convex towards the image. In other words, the thirty-first lens G31 in the third lens group G3 is a biconvex lens with positive optical power, the thirty-second lens G32 is a biconvex lens with positive optical power, the thirty-third lens G33 is a biconcave lens with negative optical power, the thirty-fourth lens G34 is a biconvex lens with positive optical power, the thirty-fifth lens G35 is a biconcave lens with negative optical power, and the thirty-sixth lens G36 is a meniscus lens with negative optical power. Through this configuration, and by rationally matching the optical powers of the six lenses in the third lens group G3, the aberrations of the zoom lens can be effectively reduced. Furthermore, the third lens group G3 uses two cemented lens elements, which not only further reduces tolerance sensitivity and improves image quality but also facilitates assembly.

[0085] Of course, in addition to the concave and convex configurations mentioned above, the lenses in a zoom lens can also include any one or more of "∞+", "∞-", "-∞", "∞+", and "+∞". Among them, "∞+" represents a lens whose object-side surface is flat at the optical axis and whose image-side surface is convex towards the object at the optical axis; "∞-" represents a lens whose object-side surface is flat at the optical axis and whose image-side surface is concave towards the object at the optical axis; "-∞" represents a lens whose object-side surface is concave towards the object at the optical axis and whose image-side surface is flat at the optical axis; and "+∞" represents a lens whose object-side surface is convex towards the object at the optical axis and whose image-side surface is flat at the optical axis. No specific limitations are made here.

[0086] Combination Figures 1 to 3 The diagram shows the structure of the zoom lens in Example 1 at different magnifications, and Tables 1a to 1f show that the main parameters of the zoom lens in Example 1 satisfy the relationship in Table 1d, as well as the concavity and convexity of each lens at the optical axis. Simulations were used to obtain the MTF, distortion map, and axial aberration map of the zoom lens in Example 1 at the wide-angle, mid-range, and telephoto ends.

[0087] MTF charts are graphs that reflect the contrast (fidelity) reproduction of zoom lenses. The MTF chart is a modulation transfer function graph; the horizontal axis represents the distance from the center to the edge, while the vertical axis reflects the quality of contrast, or fidelity. A higher vertical value on the MTF chart indicates better fidelity and higher resolution from the medium to long telephoto zoom lens.

[0088] The distortion graph above represents the percentage distortion of a zoom lens as the field of view changes, where the horizontal axis represents the percentage distortion and the vertical axis represents the normalized field of view height.

[0089] The above axial aberration diagram shows the axial aberration of a zoom lens as the aperture changes. The three curves correspond to the axial aberrations obtained under three different wavelengths of 0.486 μm, 0.587 μm, and 0.656 μm, respectively. The horizontal axis represents the axial aberration value, and the vertical axis represents the normalized aperture.

[0090] The above descriptions of the MTF, distortion map, and axial aberration map simulation diagrams are the same as those in other embodiments, and will not be repeated below.

[0091] from Figures 4 to 6 This demonstrates that the zoom lens in this embodiment achieves a zoom ratio greater than 2.5 while exhibiting minimal degradation in image fidelity and edge quality, indicating that the zoom lens meets optical performance requirements at different magnifications. Figures 7 to 9 It can be seen that the distortion correction is excellent, and the image is basically free of distortion. From Figures 10 to 12 It can be seen that the axial color difference at a 0.707 aperture is no greater than 0.2mm, and the photographed object is not prone to dispersion.

[0092] Figures 13 to 15 The diagram shows the structure of the zoom lens of Embodiment 2, focusing at infinity, at the wide-angle end, medium-telephoto end, and telephoto end. The main differences between the zoom lens of Embodiment 2 and the zoom lens of the first embodiment are: the number of lenses in the second lens group G2, the parameters and conditions satisfied by each lens in the zoom lens, and the concavity or convexity of the object side or image side of each lens at the optical axis.

[0093] The zoom lens includes a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 arranged from the object side to the image side. The second lens group G2 has negative optical power, while the first lens group G1, the third lens group G3, and the fourth lens group G4 all have positive optical power. The first lens group G1 includes a first lens L1, and the second lens group G2 includes a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The third lens group G3 includes a first compensation group G31 and a second compensation group G32 arranged from the object side to the image side. The first compensation group G31 includes a sixth lens L6, an aperture stop STO, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a twelfth lens L12. The second compensation group G32 includes a thirteenth lens L13. The fourth lens group G4 includes a fourteenth lens L14. In the second lens group G2, the second lens L2, the third lens L3, and the fourth lens L4 are all first movable mirrors, and the fifth lens L5 is the second movable mirror. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented lens.

[0094] The focusing movement method of the zoom lens in this embodiment is the same as that of the zoom lens in Embodiment 1, and will not be described again here.

[0095] Tables 2a to 2f provide the specific parameter values ​​for each lens of the zoom lens in one of the optional embodiments of Embodiment 2 of this application.

[0096]

[0097] The variable parameters of “D1”, “D2”, “D3” and “D14” in Table 2a at different magnifications, and the variable interval parameters of “B1” and “B2” at different object distances are shown in Table 2b.

[0098]

[0099] In Example 2, S14, S15, S32 and S3327 in Table 2a are aspherical surfaces, and Table 2c below shows the data of the conic coefficient and higher-order aspherical coefficient of the aspherical lens in this example.

[0100]

[0101] The parameters of the zoom lens in Example 2 satisfy the relationship shown in Table 2d.

[0102]

[0103] In this embodiment, the first lens L1 in the first lens group G1, the sixth lens L6 in the second lens group G2, the seventh lens L7 in the third lens group G3, and the twelfth lens L12 in the third lens group G3 are all first target lenses.

[0104] In this embodiment, the fourth lens L4 in the second lens group G2 and the thirteenth lens L13 in the third lens group G3 are both second target lenses.

[0105] The positive and negative values ​​of the optical power of each lens in the zoom lens of Example 2 are shown in Table 2e.

[0106]

[0107] The concavity or convexity of the object side or image side of each lens in the zoom lens of Embodiment 2 at the optical axis is shown in Table 2f.

[0108]

[0109] Combination Figure 13 To the diagram Figure 15 The provided schematic diagrams of the zoom lens in Embodiment 2 at different magnifications, and Tables 2a to 2f show the main parameters of the zoom lens in Embodiment 2 satisfying the relationship in Table 2d, as well as the concavity and convexity of each lens at the optical axis.

[0110] from Figures 16 to 18 This demonstrates that the zoom lens in this embodiment achieves a zoom ratio greater than 2.5 while exhibiting minimal degradation in image fidelity and edge quality, indicating that the zoom lens meets optical performance requirements at different magnifications. Figures 19 to 21 It can be seen that the distortion correction is excellent, and the image is basically free of distortion. From Figures 22 to 24 It can be seen that the axial color difference at a 0.707 aperture is no greater than 0.18mm, and the photographed object is not prone to dispersion.

[0111] Figures 25 to 27 The diagram shows the structure of the zoom lens of Embodiment 3 at infinity, at the wide-angle end, the medium telephoto end, and the telephoto end. The main differences between the zoom lens of Embodiment 3 and the zoom lens of the first embodiment are: the number of lenses in the third lens group G3, the parameters and conditions satisfied by each lens in the zoom lens, and the concavity or convexity of the object side or image side of each lens at the optical axis.

[0112] like Figure 25As shown, the zoom lens includes a first lens group G1, a second lens group G2, a third lens group G3, and a fourth lens group G4 arranged from the object side to the image side. The second lens group G2 has negative optical power, while the first lens group G1, the third lens group G3, and the fourth lens group G4 all have positive optical power. The first lens group G1 includes a first lens L1 and a second lens L2. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The third lens group G3 includes a first compensation group G31 and a second compensation group G32 arranged from the object side to the image side. The first compensation group G31 includes a seventh lens L7, an aperture stop STO, an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, a twelfth lens L12, and a thirteenth lens L13. The second compensation group G32 includes a fourteenth lens L14. The fourth lens group G4 includes a fifteenth lens L15. In the second lens group G2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all first movable mirrors, and the sixth lens L6 is the second movable mirror.

[0113] The eighth lens L8 and the ninth lens L9 are cemented together to form a cemented lens, and the tenth lens L10 and the eleventh lens L11 are cemented together to form a cemented lens.

[0114] The focusing movement method of the zoom lens in this embodiment is the same as that of the zoom lens in Embodiment 1, and will not be described again here.

[0115] Tables 3a to 3f provide the specific parameter values ​​for each lens of the zoom lens in one of the optional embodiments of Embodiment 3 of this application.

[0116]

[0117] The variable parameters of “D1”, “D2”, “D3” and “D14” in Table 3a at different magnifications, and the variable interval parameters of “B1” and “B2” at different object distances are shown in Table 3b.

[0118]

[0119] In Example 3, S15, S16, S32 and S3327 in Table 3a are aspherical surfaces, and Table 3c below shows the data of the conic coefficient and higher-order aspherical coefficient of the aspherical lens in this example.

[0120]

[0121] The parameters of the zoom lens in Example 3 satisfy the relationship shown in Table 3d.

[0122]

[0123] In this embodiment, the first lens L1 and the second lens L2 in the first lens group G1, the sixth lens L6 in the second lens group G2, the seventh lens L7 in the third lens group G3, and the twelfth lens L12 in the third lens group G3 are all first target lenses.

[0124] In this embodiment, the fifth lens L5 in the second lens group G2 and the thirteenth lens L13 in the third lens group G3 are both second target lenses.

[0125] The positive and negative values ​​of the optical power of each lens in the zoom lens of Example 3 are shown in Table 3e.

[0126]

[0127] The concavity or convexity of the object side or image side of each lens in the zoom lens of Embodiment 3 at the optical axis is shown in Table 3f.

[0128]

[0129] Combination Figures 25 to 27 The provided schematic diagrams of the zoom lens in Embodiment 3 at different magnifications, and Tables 3a to 3f show the main parameters of the zoom lens in Embodiment 3 satisfying the relationship in Table 3d, as well as the concavity and convexity of each lens at the optical axis.

[0130] from Figure 28 and Figure 30 It can be seen that, in this embodiment, the zoom lens achieves a zoom ratio greater than 2.5 while exhibiting minimal degradation in image fidelity and edge quality, indicating that the zoom lens meets optical performance requirements at different magnifications. From Figures 31 to 33 It can be seen that the distortion correction is excellent, and the image is basically free of distortion. From Figures 34 to 36 It can be seen that the axial color difference at a 0.707 aperture is no greater than 0.2mm, and the photographed object is not prone to dispersion.

[0131] It should be noted that, in addition to the 14 or 15 elements mentioned above, users can choose the number of lenses in a zoom lens according to their optical requirements, such as 13, 16, 17, 18, 19, or 20 elements, etc., without specific limitations. Similarly, the number and placement of aspherical lenses in a zoom lens, besides the three embodiments described above, can also be adjusted appropriately according to optical requirements, without specific limitations.

[0132] In the above three embodiments, referring to Tables 1d, 2d, and 3d, the zoom lens in the embodiments of this application satisfies the relationship: -1.2 ≤ f2 / f 3 w ≤-0.8, -1.3≤f² / f 3 T ≤-0.95.

[0133] In the optical design of this zoom lens, the second lens group G2 and the third lens group G3 bear the main optical power. If the aforementioned ratio f2 / f 3 w If it is too large, or if the above ratio f2 / f 3 T If the size is too small, an imbalance in optical power will occur, and the aberrations will be compensated solely by the first lens group G1 and the fourth lens group G4. Either the volume will be difficult to control or the geometric aberration correction will be inadequate.

[0134] When the above ratio f2 / f 3 w The ratio f2 / f 3 T Satisfying the above relationship can effectively correct aberrations, thereby improving image quality.

[0135] In the above three embodiments, referring to Tables 1d, 2d, and 3d, the zoom lens in the embodiments of this application satisfies the relationship: 7.2 ≥ f1 / f T ≥3.6.

[0136] The function of the first lens group G1 is to reduce the angle of light rays, for the ratio f1 / f mentioned above. T If the value is too large, the first lens group G1 will not be able to reduce the angle of light rays; if the ratio f1 / f T If the focal length is too small, there will be insufficient space for the movement of the second lens group G2 and the third lens group G3, making it impossible to achieve the required magnification. Simultaneously, the focal length f... T If the focal length is too short, the angle of incidence of the zoom lens will increase dramatically, causing aberrations such as spherical aberration, coma, and distortion to increase exponentially, which is not conducive to subsequent aberration correction.

[0137] When the above ratio f1 / f T Satisfying the above relationship, the first lens group G1 can effectively reduce the angle of light, which is not only beneficial for small aperture, but also for achieving high magnification and high image quality.

[0138] In the above three embodiments, referring to Tables 1d, 2d, and 3d, the zoom lens in the embodiments of this application satisfies the relationship: 5.3 ≥ f af / f2≥3.95.

[0139] If the above ratio f af If f / 2 is too large, the movement of the second moving lens will increase, lengthening the focusing time and hindering fast focusing; if the above ratio f af If f / 2 is too small, the image quality at different object distances during focusing cannot be guaranteed.

[0140] When the above ratio f af / f2 satisfies the above relationship, and this zoom lens can ensure clear image quality at different object distances while achieving fast focusing.

[0141] In the above three embodiments, referring to Tables 1d, 2d, and 3d, the zoom lens in the embodiments of this application satisfies the relationship: 5.8 ≥ f TG32G4 / f wG32G4 ≥2.85.

[0142] If the above ratio f TG32G4 / f wG32G4 If the ratio is too large, it will increase the difficulty of aberration correction for the first compensation group G31 and the second compensation group G32; if the above ratio f TG32G4 / f wG32G4 If the size is too small, a high magnification ratio cannot be achieved, or if a high magnification ratio is to be achieved, the movement of the first compensation group G31 and the second compensation group G32 needs to be increased, which is not conducive to the design of small volume.

[0143] If the above ratio f TG32G4 / f wG32G4 By satisfying the above relationship, the goal of balancing high magnification, small size, and high image quality can be well achieved.

[0144] In the above three embodiments, referring to Tables 1d, 2d, and 3d, the zoom lens in the embodiments of this application satisfies the relationship: 1.2 ≥ BFL / H 1 / 2Y ≥0.8.

[0145] If the above ratio BFL / H 1 / 2Y If the back focal length is too large, the back focal length will increase, and an excessively long back focal length will directly lead to an increase in the total optical length (TTL) of the lens, making the entire lens longer and larger, which is not conducive to miniaturization; if the above ratio BFL / H 1 / 2Y If the focal length is too small, that is, if the back focal length is too short relative to the half-image height, in order to cover the entire sensor within a very short back focal length, the light from the edge field of view must be "obliquely" incident on the photosensitive element at a large angle, resulting in an excessively large incident angle of the main light, causing a sharp decrease in edge brightness (severe vignetting), and may also cause problems such as color shift.

[0146] When the above ratio BFL / H 1 / 2Y When the above relationship is satisfied, a good balance between small size and high imaging quality can be achieved.

[0147] In the above three embodiments, in conjunction with Tables 1d, 2d and 3d, the refractive index Nd1 and Abbe number Vd1 of the first target lens in the zoom lens of this application embodiment satisfy the following relationship: 1.65≥Nd1≥1.42; 95≥Vd1≥62.

[0148] When the first target lens satisfies the above relationship, the first target lens usually has the requirement of low dispersion, that is, the first target lens is made of a low dispersion material, which is beneficial to the improvement of optical imaging quality.

[0149] In the above three embodiments, in conjunction with Tables 1d, 2d and 3d, the refractive index Nd2 and Abbe number Vd2 of the second target lens in the zoom lens of this application embodiment satisfy the following relationship: 2.00≥Nd2≥1.83; 32≥Vd2≥18.

[0150] When the second target lens satisfies the above relationship, the requirement of low dispersion of the second target lens, that is, the first target lens is made of a low dispersion material, is beneficial to the improvement of optical imaging quality.

[0151] In summary, the zoom lens in this embodiment has a zoom ratio greater than or equal to 2.5, and a field of view less than or equal to 31° at the telephoto end; the field of view at the wide-angle end is greater than or equal to 83°. This zoom lens achieves high magnification and its optical performance is superior to that of ordinary zoom lenses.

[0152] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A zoom lens, characterized in that, It includes a first lens group, a second lens group, a third lens group, and a fourth lens group arranged from the object side to the image side. The second lens group has negative optical power, and the first lens group, the third lens group, and the fourth lens group all have positive optical power. The first lens group includes at least one lens, the second lens group includes at least four lenses, the third lens group includes at least seven lenses, and the fourth lens group includes one lens; Both the second lens group and the third lens group can move relative to the first lens group along the optical axis of the zoom lens, so that the zoom lens can perform zoom focusing between the wide-angle end and the telephoto end; The second lens group includes a first movable mirror and a second movable mirror. The second movable mirror is movable relative to the first movable mirror to achieve focusing of the zoom lens.

2. The zoom lens according to claim 1, characterized in that, The second lens group and the third lens group are linked to enable the zoom lens to perform zoom focusing between the wide-angle end and the telephoto end.

3. The zoom lens according to claim 2, characterized in that, The third lens group includes a first compensation group and a second compensation group arranged from the object side to the image side. The second lens group, the first compensation group, and the second compensation group are linked to enable the zoom lens to perform zoom focusing between the wide-angle end and the telephoto end. Specifically, when the zoom lens moves from the wide-angle end to the medium focal length end, the second lens group moves from the object side to the image side; when the zoom lens moves from the medium focal length end to the telephoto end, it moves from the image side to the object side; when the zoom lens moves from the wide-angle end to the medium focal length end and then to the telephoto end, the first compensation group moves unidirectionally from the image side to the object side, and the second compensation group moves unidirectionally from the image side to the object side. And / or, the first compensation group has positive optical power, the second compensation group has negative optical power, and the second compensation group includes one of the lenses.

4. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies the following relationship: -1.2 ≤ f2 / f 3 w ≤-0.8; Where f2 is the focal length of the second lens group when focused at infinity; f 3w The combined focal length of the third lens group at the wide-angle end is given.

5. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies the following relationship: -1.3 ≤ f2 / f 3 T ≤-0.95; Where f2 is the focal length of the second lens group when focused at infinity; f 3T The combined focal length of the third lens group at the telephoto end is given.

6. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies the following relationship: 7.2 ≥ f1 / f T ≥3.6; Where f1 is the focal length of the first lens group; f T The focal length of the zoom lens at the telephoto end is given.

7. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies the following relationship: 5.3 ≥ f af / f2≥3.95; Among them, f af f1 is the focal length of the second moving mirror; f2 is the focal length of the second lens group when it is focused at infinity.

8. The zoom lens according to claim 3, characterized in that, The zoom lens satisfies the following relationship: 5.8 ≥ f TG32G4 / f wG32G4 ≥2.85; Among them, f TG32G4 f is the combined focal length of the second compensation group and the fourth lens group when the zoom lens is at the telephoto end; wG32G4 The focal length of the zoom lens at the wide-angle end is the combined focal length of the second compensation group and the fourth lens group.

9. The zoom lens according to claim 1, characterized in that, The zoom lens satisfies the following relationship: 1.2 ≥ BFL / H 1 / 2Y ≥0.8; Where: BFL is the back focal length of the zoom lens; H 1 / 2Y This is the half-image height of the zoom lens.

10. The zoom lens according to claim 1, characterized in that, The zoom lens includes a first target lens, the refractive index Nd1 and the Abbe number Vd1 of the first target lens satisfying the following relationship: 1.65≥Nd1≥1.42; 95≥Vd1≥62; And / or, the zoom lens includes a second target lens, the refractive index Nd2 and the Abbe number Vd2 of the second target lens satisfying the following relationships: 2.00≥Nd2≥1.83; 32≥Vd2≥18.

11. The zoom lens according to any one of claims 1-10, characterized in that, The zoom ratio of the zoom lens is greater than or equal to 2.5; And / or, the field of view of the zoom lens at the telephoto end is less than or equal to 31°; the field of view of the zoom lens at the wide-angle end is greater than or equal to 83°.

12. The zoom lens according to any one of claims 1-10, characterized in that, It also includes an aperture stop, which is disposed in the third lens group and located after the lens at the first position in the direction from the object side to the image side.

13. A camera module, characterized in that, include: The zoom lens according to any one of claims 1 to 12; A photosensitive element is disposed on the image side of the zoom lens.

Images