Optical lens

Abstract

The invention provides an optical lens. The optical lens sequentially comprises a first group with positive focal power, a second group with positive focal power and a third group with negative focal power from an object side to an imaging surface along an optical axis, the first group is composed of a first refraction and reflection lens with positive focal power; the second group is composed of three lenses, and the three lenses sequentially comprise a second lens with focal power, a third lens with focal power and a fourth lens with focal power from the object side to the imaging surface; the third group is composed of three lenses, and sequentially comprises a fifth lens with focal power, a sixth lens with negative focal power and a seventh lens with focal power from the object side to the imaging surface; and the second group can dynamically move on the optical axis, so that the optical lens can be switched between a long-focus state and a micro-distance state. According to the optical lens provided by the invention, zoom switching of the lens from a long-focus state to a micro-distance state can be realized, and the excellent effect of compatibility of periscopic long-focus shooting and micro-distance shooting can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art

[0002] With the popularity of smart mobile devices such as smartphones, and in order to meet the pursuit of better shooting effects in different scenarios, the functions of image modules are constantly being improved and expanded. Among them, periscope telephoto lenses with longer focal lengths are also slowly being installed on mobile terminals, meeting the needs of shooting distant scenes. The shooting function of multiple scenes on the same lens can be achieved by moving certain lens groups. However, the movement of the lens groups is often large, which leads to an increase in the size of the image module and makes it impossible to achieve lightweight mobile devices. Therefore, in order to solve this problem, it is necessary to develop a lens with a small movement of the lens group and high performance in multiple shooting scenarios. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide an optical lens that can realize zoom switching of the lens from a telephoto state to a macro state, thereby greatly improving the user experience.

[0004] The technical solution adopted by the present invention is: An optical lens, comprising, along an optical axis, from an object side to an imaging surface, a first group having positive optical power, a second group having positive optical power, and a third group having negative optical power; The first group is composed of a first catadioptric lens with positive power, the first catadioptric lens includes an incident surface, a reflecting surface and an exit surface, the incident surface of the first catadioptric lens is a convex surface, and the exit surface of the first catadioptric lens is a convex surface; the reflecting surface of the first catadioptric lens forms an angle of 45° with the optical axes of the incident surface and the exit surface of the first catadioptric lens respectively; The second group consists of three lenses, which include, from the object side to the imaging surface, a second lens having optical power, a third lens having optical power, and a fourth lens having optical power; The object side surface of the third lens is a convex surface; The third group consists of three lenses, which include, from the object side to the imaging surface, a fifth lens with optical power, a sixth lens with negative optical power, and a seventh lens with optical power; The object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; The object side surface of the sixth lens is a concave surface; The image side surface of the seventh lens is a concave surface; The second group can be dynamically moved on the optical axis to realize the switching of the optical lens between a telephoto state and a macro state; Among them, the effective focal length fl of the optical lens in the telephoto state and the effective focal length fm of the optical lens in the macro state satisfy: 1.28 < fl / fm < 1.38.

[0005] Further preferably, the focal length fQ1 of the first group and the effective focal length fl of the optical lens in the telephoto state satisfy: 1 < fQ1 / fl < 1.9.

[0006] Further preferably, the focal length fQ2 of the second group and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.4 < fQ2 / fl < 0.85.

[0007] Further preferably, the focal length fQ3 of the third group and the effective focal length fl of the optical lens in the telephoto state satisfy: -0.5 < fQ3 / fl < -0.3.

[0008] Further preferably, the focal length f5 of the fifth lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -1 < f5 / fl < 1.

[0009] Further preferably, the focal length f6 of the sixth lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -2.5 < f6 / fl < -0.25.

[0010] Further preferably, the focal length f7 of the seventh lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -0.8 < f7 / fl < 0.8.

[0011] Further preferably, the overall optical length TTL of the optical lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 1.52 < TTL / fl < 1.65; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.9 < TTL / IH < 3.2.

[0012] Further preferably, when the optical lens switches from the telephoto state with an infinite object distance to the macro state with an object distance of 10 cm, the focusing stroke CTw of the second group satisfies: 1 mm < CTw < 2.1 mm.

[0013] Further preferably, the minimum axial gap DT1w between the second group and the first group in different states satisfies: 0.2 mm < DT1w < 0.55 mm; the minimum axial gap DT2w between the second group and the third group in different states satisfies: 0.33 mm < DT2w < 0.45 mm.

[0014] Further preferably, the combined focal length fQ12 of the first group and the second group in the telephoto state and the combined focal length fQ12′ of the first group and the second group in the macro state satisfy: 1 <fQ12 / fQ12‘<1.1。

[0015] Compared with the prior art, the optical lens provided by the present invention can realize the zoom switching of the lens from the telephoto state to the macro state by changing the air spacing distance between different lens groups and setting a refractive element with a refractive power, and can achieve the excellent effect of compatibility between periscope telephoto shooting and macro shooting, and has one or more advantages such as large target surface, large aperture, miniaturization, high-quality imaging, etc., which greatly improves the user experience effect. At the same time, since the focusing stroke required for the telephoto lens to focus is relatively small, it is also beneficial to reduce the volume of the motor used to drive the focus lens group to move, making it easier to miniaturize the camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 1 of the present invention.

[0017] Figure 2 Schematic diagram of the structure of the optical lens in macro state in Embodiment 1 of the present invention.

[0018] Figure 3 1 is an axial aberration curve diagram, a magnification chromatic aberration curve diagram and a distortion curve diagram of the optical lens in the telephoto state in Example 1 of the present invention.

[0019] Figure 4 The axial aberration curve, the magnification chromatic aberration curve and the distortion curve of the optical lens in the macro state in Example 1 of the present invention are shown.

[0020] Figure 5 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 2 of the present invention.

[0021] Figure 6 Schematic diagram of the structure of the optical lens in macro state in Embodiment 2 of the present invention.

[0022] Figure 7 1 and 2 are axial aberration curves, magnification chromatic aberration curves, and distortion curves of the optical lens in telephoto state in Example 2 of the present invention.

[0023] Figure 8 The axial aberration curve, the magnification chromatic aberration curve and the distortion curve of the optical lens in the macro state in Example 2 of the present invention are shown.

[0024] Fig. 9 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 3 of the present invention.

[0025] Fig.10 Schematic diagram of the structure of the optical lens in macro state in Embodiment 3 of the present invention.

[0026] Fig.11 1 and 2 are axial aberration curves, magnification chromatic aberration curves, and distortion curves of the optical lens in telephoto state in Example 3 of the present invention.

[0027] Fig.12 1 and 2 are axial aberration curves, magnification chromatic aberration curves and distortion curves of the optical lens in macro state in Example 3 of the present invention.

[0028] Fig.13 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 4 of the present invention.

[0029] Fig.14 Schematic diagram of the structure of the optical lens in macro state in Embodiment 4 of the present invention.

[0030] Fig.15 1 and 2 are axial aberration curves, magnification chromatic aberration curves, and distortion curves of the optical lens in telephoto state in Example 4 of the present invention.

[0031] Fig.16 1 and 2 are axial aberration curves, magnification chromatic aberration curves and distortion curves of the optical lens in macro state in Example 4 of the present invention.

[0032] Fig.17 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 5 of the present invention.

[0033] Fig.18 Schematic diagram of the structure of the optical lens in macro state in Embodiment 5 of the present invention.

[0034] Fig.19 1 and 2 are axial aberration curves, magnification chromatic aberration curves and distortion curves of the optical lens in the telephoto state in Example 5 of the present invention.

[0035] Fig. 20 1 and 2 are axial aberration curves, magnification chromatic aberration curves and distortion curves of the optical lens in the macro state in Example 5 of the present invention.

[0036] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0037] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0039] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0040] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0041] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0042] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] The optical lens provided in the embodiment of the present invention is a periscope zoom lens, which includes: a first group with positive optical power, a second group with positive optical power, and a third group with negative optical power in sequence along the optical axis from the object side to the imaging surface. The first group and the third group are fixed lens groups, which do not move when the optical lens is focused; the second group is a focusing lens group, which can dynamically move on the optical axis when the optical lens is focused to realize the switching of the optical lens between the telephoto state and the macro state, that is, the air interval between the second group and the first group and the third group on the optical axis of the present invention is variable, and by changing the air interval distance between different groups, the zoom switching of the lens from the telephoto state to the macro state can be realized.

[0045] Specifically, the first group is composed of a first catadioptric lens with positive focal power, the first catadioptric lens includes an incident surface, a reflection surface and an exit surface, the incident surface of the first catadioptric lens is a convex surface, the exit surface of the first catadioptric lens is a convex surface, and the reflection surface of the first catadioptric lens is a plane. The reflection surface of the first catadioptric lens forms an angle of 45° with the optical axes of the incident surface and the exit surface of the first catadioptric lens, respectively. By setting a first catadioptric lens with refractive power, periscope imaging of the optical lens can be realized, and the length of the lens in the thickness direction of the electronic device can be greatly reduced, which can better meet the development trend of ultra-thin portable electronic devices such as mobile phones.

[0046] The second group is composed of three lenses, which include, from the object side to the image plane, a second lens having optical power, a third lens having optical power, and a fourth lens having optical power. The second lens may have positive optical power or negative optical power, the object side surface of the second lens may be a concave surface or a convex surface, and the image side surface of the second lens may be a concave surface or a convex surface. The third lens may have positive optical power or negative optical power, the object side surface of the third lens may be a convex surface, and the image side surface of the third lens may be a concave surface or a convex surface. The fourth lens may have positive optical power or negative optical power, the object side surface of the fourth lens may be a concave surface or a convex surface, and the image side surface of the fourth lens may be a concave surface or a convex surface.

[0047] The third group consists of three lenses, including, from the object side to the image plane, a fifth lens having optical power, a sixth lens having negative optical power, and a seventh lens having optical power. The fifth lens may have positive optical power or negative optical power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex. The object side surface of the sixth lens is concave, and the image side surface of the sixth lens may be concave or convex. The seventh lens may have positive optical power or negative optical power, the object side surface of the seventh lens may be concave or convex, and the image side surface of the seventh lens is concave.

[0048] In some embodiments, the first catadioptric lens adopts an integrally formed structure and may adopt a catadioptric prism structure for deflecting light, specifically a right-angled triangular prism. Both the incident surface and the exit surface of the first catadioptric lens are aspherical surfaces, and the reflecting surface of the first catadioptric lens is a plane, which is beneficial to reducing the weight and manufacturing cost of the prism and provides an advantage for achieving large prism anti-shake. When the object-side light beam of the optical lens of the present invention passes through the first catadioptric lens, it is reflected on the reflecting surface of the first catadioptric lens, causing the optical axis to turn 90°. Then it passes through the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens in sequence, and finally undergoes the filtering process of the filter to complete image acquisition on the photosensitive chip (imaging surface), achieving a periscope imaging effect.

[0049] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the first catadioptric lens and the second lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image. During the focusing process, the diaphragm always follows the object-side surface of the second lens. In actual production, the diaphragm can adopt a spacer structure in the second group, or be realized by a spraying process on the surface of the second lens.

[0050] In some embodiments, the optical lens may further include a filter, and the filter is disposed between the seventh lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0051] In some embodiments, the effective focal length fl of the optical lens in the telephoto state and the effective focal length fm of the optical lens in the macro state satisfy: 1.28 < fl / fm < 1.38. Meeting the above conditions can enable the lens to have a relatively long focal length in both the telephoto and macro states, so as to better match a larger target surface sensor and ensure high-quality imaging quality.

[0052] In some embodiments, the focal length fQ1 of the first group and the effective focal length fl of the optical lens in the telephoto state satisfy: 1 < fQ1 / fl < 1.9. Meeting the above conditions, by setting the first catadioptric lens to have an appropriate positive refractive power, the incident light beam can be greatly contracted when it reaches the subsequent lens group after being reflected by the reflecting element, and the beam diameter is small. Therefore, the subsequent lens group no longer becomes the maximum limit of the light passing aperture of the telephoto lens, effectively increasing the light passing aperture and realizing the large aperture performance of the lens.

[0053] In some embodiments, the focal length fQ2 of the second group and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.4 < fQ2 / fl < 0.85. Meeting the above conditions, by setting the second group to have a large positive refractive power, the focusing of the lens on different object distances is completed by the movement of the second group, which is beneficial to reducing the focusing stroke; the smaller focusing stroke can effectively suppress the deterioration of aberration caused by focusing, enabling the telephoto lens to have a strong focusing ability, and thus having a high imaging quality and a strong macro ability.

[0054] In some embodiments, the focal length fQ3 of the third group and the effective focal length fl of the optical lens in the telephoto state satisfy: -0.5 < fQ3 / fl < -0.3. Meeting the above conditions, the third group has a large negative refractive power, enabling the lens to correct the aberration of the front focusing group well in different focusing states, ensuring that the lens has a high imaging quality in different focusing states.

[0055] In some embodiments, the focal length f5 of the fifth lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -1 < f5 / fl < 1; the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 0.3 < R9 / R10 < 2.2. Meeting the above conditions is beneficial to the smooth transition of light, balancing the aberration brought by the front lens group in different focusing states, and improving the imaging quality of the optical lens.

[0056] In some embodiments, the focal length f6 of the sixth lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -2.5 < f6 / fl < -0.25; the curvature radius R11 of the object side of the sixth lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -2.2 < R11 / fl < -0.2. Meeting the above conditions can diverge the incident light to a large extent, thereby effectively increasing the height of the light entering the imaging surface and better realizing the large target surface imaging of the lens.

[0057] In some embodiments, the focal length f7 of the seventh lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -0.8 < f7 / fl < 0.8. Meeting the above conditions can correct various aberrations of the system well and improve the imaging quality of the lens.

[0058] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 1.52 < TTL / fl < 1.65. Meeting the above conditions can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens.

[0059] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.9 < TTL / IH < 3.2. Meeting the above conditions can better achieve the miniaturization of the lens. At the same time, when ensuring the same total length of the lens, it has a larger image plane, and can better achieve high-definition imaging of the lens.

[0060] In some embodiments, when the optical lens switches from the long focal length state at an infinite object distance to the macro state at an object distance of 10 cm, the focusing stroke CTw of the second group satisfies: 1 mm < CTw < 2.1 mm. The focusing stroke refers to the movement amount of the focusing lens group (the second group) on the optical axis when the lens switches from the long focal length state to the macro state. Meeting the above conditions can make the lens have a smaller focusing stroke, effectively suppress the deterioration of aberration caused by focusing, enable the telephoto lens to have a strong focusing ability, thus having a high imaging quality and a strong macro ability. At the same time, since the focusing stroke required for the telephoto lens to focus is smaller, it is also beneficial to reduce the volume of the motor used to drive the movement of the second group, making it easier to miniaturize the camera module.

[0061] In some embodiments, the minimum axial gap DT1w between the second group and the first group in different states satisfies: 0.2 mm < DT1w < 0.55 mm; the minimum axial gap DT2w between the second group and the third group in different states satisfies: 0.33 mm < DT2w < 0.45 mm. The optical lens realizes the switching between the long focal length state and the macro state through the dynamic movement of the second group on the optical axis. Specifically, when the second group moves along the optical axis towards the object side, the optical lens realizes the switching from the long focal length state to the macro state. Therefore, the axial gap DT1wm between the second group and the first group in the macro state is smaller than the axial gap DT1wl between the second group and the first group in the long focal length state; the axial gap DT2wl between the second group and the third group in the long focal length state is smaller than the axial gap DT2wm between the second group and the third group in the macro state. Meeting the above conditions, by reasonably controlling the minimum distance (i.e., the minimum axial gap) between the focusing lens group (the second group) and the front and rear fixed groups (the first and third groups) in the optical axis direction, it can better ensure that there is enough space reserved for the installation of the focusing motor used to drive the movement of the second group, and also prevent structural interference between the focusing lens group and the front and rear fixed groups during the movement.

[0062] In some embodiments, the combined focal length fQ12 of the first group and the second group in the telephoto state and the combined focal length fQ12' of the first group and the second group in the macro state satisfy: 1 < fQ12 / fQ12' < 1.1. Meeting the above conditions indicates that during the focusing process of the optical lens switching from infinity telephoto to macro, as the second group moves dynamically towards the object side, the combined focal length of the first and second groups decreases, and the effective focal length of the overall lens also decreases. A relatively small focusing stroke can achieve the focusing process of the lens from telephoto to macro at 10 cm.

[0063] In some embodiments, the focal length f3 of the third lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -1.5 < f3 / fl < 0.5; the curvature radius R5 of the object side surface of the third lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.2 < R5 / fl < 0.6. Meeting the above conditions is conducive to the optical lens stably capturing light rays at different object distances and different angles, and improving the stability of the optical lens during the focusing process.

[0064] In some embodiments, the focal length fQ1 of the first group and the focal length fQ2 of the second group satisfy: 1.4 < fQ1 / fQ2 < 4; the focal length fQ2 of the second group and the focal length fQ3 of the third group satisfy: -2 < fQ2 / fQ3 < -1. Meeting the above conditions, by reasonably distributing the focal length relationship between the focusing lens group (the second group) and the front and rear fixed lens groups (the first and third groups), the light flux and aperture size of the system can be effectively improved. At the same time, the deflection angle of light rays in different focusing states of the optical system can be reduced, which helps to correct optical aberrations and ensure that the lens has high imaging quality in different focusing states.

[0065] In some embodiments, the curvature radius R1 of the incident surface of the first catadioptric lens and the curvature radius R2 of the exit surface of the first catadioptric lens satisfy: -2.8 < R1 / R2 < -0.15. Meeting the above conditions, by reasonably setting the curvature radii of the incident surface and the exit surface of the first catadioptric lens, a wide range of light rays entering the system can be better converged and refracted, enabling the light rays to enter the subsequent optical system smoothly and improving the overall imaging quality.

[0066] In some embodiments, the effective aperture CM11 of the incident surface of the first catadioptric lens and the effective aperture CM21 of the exit surface of the first catadioptric lens satisfy: 1.25 < CM11 / CM21 < 1.65; meeting the above conditions can enable the incident light rays to enter the subsequent lens with a smaller aperture after effective convergence by the first catadioptric lens, reduce the thickness of the lens on the imaging device carried, and better achieve the miniaturization of the lens volume.

[0067] The effective aperture CM11 of the incident surface of the first catadioptric lens and the effective aperture CM72 of the image side surface of the seventh lens satisfy: 1.1 < CM11 / CM72 < 1.5. By satisfying the above conditions and setting the first lens (the first catadioptric lens) to have a relatively large aperture, it is possible to ensure that light enters the system within a large range during the focusing process from telephoto to macro, ensuring that the lens has a large light flux in different focusing states and realizing the large aperture performance of the lens.

[0068] In some embodiments, the refractive index Nd1 of the first catadioptric lens satisfies: 1.5 < Nd1 < 1.6; the Abbe number Vd1 of the first catadioptric lens satisfies: 50 < Vd1 < 60. By satisfying the above conditions, the catadioptric element can be made of plastic material, and the injection molding process can be used to realize the integral molding of the reflecting element, which is beneficial to reducing the weight and manufacturing cost of the catadioptric element and providing advantages for realizing a large prism anti-shake.

[0069] In some embodiments, the optical lens satisfies the conditional formula: 22mm < fl < 23mm, 16mm < fm < 17.5mm, 34mm < TTL < 36mm, 11.2mm < IH < 11.6mm; where fl represents the effective focal length of the optical lens in the telephoto state, fm represents the effective focal length of the optical lens in the macro state, TTL represents the overall optical length of the optical lens, that is, the propagation path length of light along the optical axis from the incident surface of the first catadioptric lens to the imaging surface, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. The focal length range of the optical lens of the present invention is 16mm to 23mm, and the maximum field of view angle range of the optical lens of the present invention is 26° to 30°. The optical lens provided by the embodiments of the present invention has at least the characteristics of miniaturization, a relatively large field of view angle, a large aperture, and a large image surface. At the same time, the optical lens of the present invention uses the same large target surface sensor in both the telephoto and macro states to ensure high-quality imaging.

[0070] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only enables the lens to have excellent imaging performance, but also makes the structure of the lens relatively compact, and can better achieve the balance of miniaturization and high image quality of the lens.

[0071] In some embodiments, the first folding reflective lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens may be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and reducing the size of lenses, and better realizing miniaturization of lenses. More specifically, the first folding reflective lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the present invention may all be aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and reducing the size of lenses, and better realizing miniaturization of lenses.

[0072] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations: ; Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, B, C, D, E, F, G, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients respectively.

[0073] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical 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 invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0074] Example 1 See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention in a telephoto state, Figure 2 This is a structural schematic diagram of the optical lens 100 provided in Example 1 of the present invention in a macro state. The optical lens includes, along the optical axis from the object side to the imaging surface S17, a first group with positive optical power, a second group with positive optical power, a third group with negative optical power, and a filter G1.

[0075] The first group includes a first catadioptric lens L1, which has positive focal power and includes an incident surface S1, a reflective surface R0 and an exit surface S2; the incident surface S1 is a convex surface, and the exit surface S2 is a convex surface; the incident surface S1 and the exit surface S2 are both aspherical surfaces, and the reflective surface R0 is a plane. The reflective surface R0 of the first catadioptric lens L1 forms an angle of 45° with the optical axes of its incident surface S1 and the exit surface S2, respectively. It can be understood that its incident surface S1 faces the object side, and its exit surface S2 faces the second lens L2.

[0076] The second group is a focus lens group, which includes, from the object side to the imaging surface, an aperture ST, a second lens L2, a third lens L3 and a fourth lens L4.

[0077] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave; The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is convex; The fourth lens L4 has negative refractive power, its object side surface S7 is concave, and its image side surface S8 is concave at the near optical axis; The third group includes, from the object side to the imaging surface, a fifth lens L5, a sixth lens L6 and a seventh lens L7.

[0078] The fifth lens L5 has positive refractive power, its object-side surface S9 is concave, and its image-side surface S10 is convex; The sixth lens L6 has negative refractive power, an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is convex.

[0079] The seventh lens L7 has negative refractive power, and its object-side surface S13 is concave, and its image-side surface S14 is concave.

[0080] The first folding reflective lens L1 is an injection-molded integral structure, and may adopt a folding reflective prism design, and may specifically be a right-angle triangular prism.

[0081] The first folding lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspherical lenses.

[0082] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0083] Table 1-1 The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0084] Table 1-2 Among them, in the above Table 1-1, H1 is the air gap between the first group and the object on the object side on the optical axis, H2 is the air gap between the first group and the second group (focusing lens group) on the optical axis, and H3 is the air gap between the second group and the third group on the optical axis. The present application realizes the zoom switching of the optical lens in the telephoto state and the macro state by changing the air gaps H2 and H3.

[0085] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.97 mm.

[0086] The parameters of the optical lens 100 of the first embodiment in the telephoto state and the 10 cm macro state are shown in Tables 1-3.

[0087] Table 1-3 As shown in Table 1-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 2.348 mm, and H3 is 0.912 mm, corresponding to Figure 1 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.378mm, and H3 is 2.882mm, corresponding to Figure 2 The optical structure of the optical lens in the 10cm macro state.

[0088] Figure 3 (A) and Figure 4 (A) in the figure are axial aberration curves of the optical lens 100 in the telephoto state and the macro state in this embodiment, which represent the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 100 can well correct the axial aberration in both the telephoto and macro states.

[0089] Figure 3 (B) and Figure 4(B) in the figure are magnification chromatic aberration curves of the optical lens 100 in the telephoto state and the macro state in this embodiment, which represent the chromatic aberration of each wavelength relative to the central wavelength (0.55μm) at different image heights on the imaging surface, the horizontal axis represents the magnification chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1.5μm, indicating that the optical lens 100 can correct chromatic aberration well in both the telephoto and macro states.

[0090] Figure 3 (C) and Figure 4 (C) in the figure are distortion curves of the optical lens 100 in the telephoto state and the macro state in this embodiment, which represent the distortion of light of different wavelengths at different image heights on the imaging surface, with the horizontal axis representing the distortion value (unit: %) and the vertical axis representing the image height (unit: mm). It can be seen from the figure that the distortion of the optical lens is controlled within ±1%, indicating that the optical lens 100 can well correct the distortion in both the telephoto and macro states.

[0091] It can be seen from the above figures that the aberrations of the optical lens in Example 1 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0092] Example 2 See also Figure 5 and Figure 6 , shown are schematic structural diagrams of the optical lens 200 provided in Example 2 of the present invention in a telephoto state and a macro state. Compared with Example 1, the main differences of this embodiment are: the second lens L2 has positive focal power; the third lens L3 has negative focal power; the fourth lens L4 has positive focal power; the fifth lens L5 has negative focal power; the seventh lens L7 has positive focal power; the image side surface S6 of the third lens L3 is a concave surface; the object side surface S7 of the fourth lens L4 is a convex surface; the image side surface S8 of the fourth lens L4 is a convex surface; the image side surface S12 of the sixth lens L6 is a concave surface; the object side surface S13 of the seventh lens L7 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0093] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0094] Table 2-1 The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0095] Table 2-2 Among them, in the above Table 2-1, H1 is the air gap between the first group and the object on the object side on the optical axis, H2 is the air gap between the first group and the second group (focusing lens group) on the optical axis, and H3 is the air gap between the second group and the third group on the optical axis. The present application realizes the zoom switching of the optical lens in the telephoto state and the macro state by changing the air gaps H2 and H3.

[0096] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.213 mm.

[0097] The parameters of the optical lens 200 of the second embodiment in the telephoto state and the 10 cm macro state are shown in Table 2-3.

[0098] Table 2-3 As shown in Table 2-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 1.597 mm and H3 is 0.661 mm, corresponding to Figure 5 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.384mm, and H3 is 1.874mm, corresponding to Figure 6 The optical structure of the optical lens in the 10cm macro state.

[0099] Figure 7 (A) and Figure 8 (A) in the figure are axial aberration curves of the optical lens 200 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 200 can correct the axial aberration well.

[0100] Figure 7 (B) and Figure 8 (B) in the figure are magnification chromatic aberration curves of the optical lens 200 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1.5μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0101] Figure 7 (C) and Figure 8(C) in the figure are distortion curves of the optical lens 200 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the distortion of the optical lens is controlled within ±1%, indicating that the optical lens 200 can correct the distortion well.

[0102] It can be seen from the above figures that the aberrations of the optical lens in Example 2 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0103] Example 3 See also Fig. 9 and Fig.10 , shown are schematic structural diagrams of the optical lens 300 provided in Example 3 of the present invention in a telephoto state and a macro state, respectively. Compared with Example 1, the main differences of this embodiment are: the third lens L3 has negative optical power; the fourth lens L4 has positive optical power; the fifth lens L5 has negative optical power; the seventh lens L7 has positive optical power; the object-side surface S3 of the second lens L2 is a concave surface; the image-side surface S4 of the second lens L2 is a convex surface; the image-side surface S6 of the third lens L3 is a concave surface; the object-side surface S7 of the fourth lens L4 is a convex surface; the image-side surface S8 of the fourth lens L4 is a convex surface; the image-side surface S12 of the sixth lens L6 is a concave surface; the object-side surface S13 of the seventh lens L7 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0104] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0105] Table 3-1 The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0106] Table 3-2 Among them, in the above Table 3-1, H1 is the air gap between the first group and the object on the object side on the optical axis, H2 is the air gap between the first group and the second group (focusing lens group) on the optical axis, and H3 is the air gap between the second group and the third group on the optical axis. The present application realizes the zoom switching of the optical lens in the telephoto state and the macro state by changing the air gaps H2 and H3.

[0107] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.103 mm.

[0108] The parameters of the optical lens 300 of this embodiment 3 in the telephoto state and the 10 cm macro state are shown in Table 3-3.

[0109] Table 3-3 As shown in Table 3-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 0.830 mm and H3 is 0.459 mm, corresponding to Fig. 9 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is -0.273mm, and H3 is 1.562mm, corresponding to Fig.10 The optical structure of the optical lens in the 10cm macro state.

[0110] Fig.11 (A) and Fig.12 (A) in the figure are axial aberration curves of the optical lens 300 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 300 can correct the axial aberration well.

[0111] Fig.11 (B) and Fig.12 (B) in the figure are magnification chromatic aberration curves of the optical lens 300 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1.5μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0112] Fig.11 (C) and Fig.12 (C) in the figure are distortion curves of the optical lens 300 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the distortion of the optical lens is controlled within ±1%, indicating that the optical lens 300 can correct the distortion well.

[0113] It can be seen from the above figures that the aberrations of the optical lens in Example 3 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0114] Example 4 See also Fig.13 and Fig.14 , which are schematic structural diagrams of the optical lens 400 provided in Example 4 of the present invention in a telephoto state and a macro state, respectively. Compared with Example 1, the main differences between this embodiment and Example 1 are that: the image side surface S8 of the fourth lens L4 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0115] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0116] Table 4-1 The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0117] Table 4-2 Among them, in the above Table 4-1, H1 is the air gap between the first group and the object on the object side on the optical axis, H2 is the air gap between the first group and the second group (focusing lens group) on the optical axis, and H3 is the air gap between the second group and the third group on the optical axis. The present application realizes the zoom switching of the optical lens in the telephoto state and the macro state by changing the air gaps H2 and H3.

[0118] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.895 mm.

[0119] The parameters of the optical lens 400 of this embodiment 4 in the telephoto state and the 10 cm macro state are shown in Table 4-3.

[0120] Table 4-3 As shown in Table 4-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 2.212 mm and H3 is 0.892 mm, corresponding to Fig.13 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.317mm, and H3 is 2.787mm, corresponding to Fig.14The optical structure of the optical lens in the 10cm macro state.

[0121] Fig.15 (A) and Fig.16 (A) in the figure are respectively axial aberration curves of the optical lens 400 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 400 can correct the axial aberration well.

[0122] Fig.15 (B) and Fig.16 (B) in the figure are magnification chromatic aberration curves of the optical lens 400 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0123] Fig.15 (C) and Fig.16 (C) in the figure are distortion curves of the optical lens 400 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the distortion of the optical lens is controlled within ±1%, indicating that the optical lens 400 can correct the distortion well.

[0124] It can be seen from the above figures that the aberrations of the optical lens in Example 4 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0125] Example 5 See also Fig.17 and Fig.18 , which are schematic diagrams of the structures of the optical lens 500 provided in Example 5 of the present invention in a telephoto state and a macro state, respectively. Compared with Example 1, the main differences of this embodiment are: the fourth lens L4 has positive focal power; the image side surface S8 of the fourth lens L4 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0126] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0127] Table 5-1 The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0128] Table 5-2 Among them, in the above Table 5-1, H1 is the air gap between the first group and the object on the object side on the optical axis, H2 is the air gap between the first group and the second group (focusing lens group) on the optical axis, and H3 is the air gap between the second group and the third group on the optical axis. The present application realizes the zoom switching of the optical lens in the telephoto state and the macro state by changing the air gaps H2 and H3.

[0129] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.801 mm.

[0130] The parameters of the optical lens 500 of this embodiment 5 in the telephoto state and the 10 cm macro state are shown in Table 5-3.

[0131] Table 5-3 As shown in Table 5-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 2.184 mm, and H3 is 0.530 mm, corresponding to Fig.17 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.383mm, and H3 is 2.331mm, corresponding to Fig.18 The optical structure of the optical lens in the 10cm macro state.

[0132] Fig.19 (A) and Fig. 20 (A) in the figure are respectively axial aberration curves of the optical lens 500 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 500 can correct the axial aberration well.

[0133] Fig.19 (B) and Fig. 20 (B) in the figure are magnification chromatic aberration curves of the optical lens 500 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1μm, indicating that the optical lens 500 can correct chromatic aberration well.

[0134] Fig.19 (C) and Fig. 20(C) in the figure are distortion curves of the optical lens 500 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the distortion of the optical lens is controlled within ±1%, indicating that the optical lens 500 can correct the distortion well.

[0135] It can be seen from the above figures that the aberrations of the optical lens in Example 5 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0136] Please refer to Table 6, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length fl of the optical lens in the telephoto state, the effective focal length fm of the optical lens in the macro state, the total optical length TTL of the optical lens (i.e., the propagation path length of the light from the incident surface of the first folding lens to the imaging surface along the optical axis), the aperture value Fno, the real image height IH corresponding to the maximum field of view of the optical lens, the maximum field of view FOVl of the optical lens in the telephoto state, the maximum field of view FOVm of the optical lens in the macro state, the axial gap DT1wl between the second group and the first group in the telephoto state, the axial gap DT1wm between the second group and the first group in the macro state, the axial gap DT2wl between the second group and the third group in the telephoto state, the axial gap DT2wm between the second group and the third group in the macro state, and the numerical value corresponding to each conditional expression in each embodiment.

[0137] Table 6 In summary of the above embodiments, the optical lens provided by the present invention has the following advantages: The optical lens provided by the present invention can well realize optical zoom. By changing the air spacing distance between different lens groups and setting a refractive element with a refractive power, the zoom switching of the lens from the telephoto state to the macro state can be realized, and the excellent effect of compatibility between periscope telephoto shooting and macro shooting can be achieved. It has one or more advantages such as large target surface, large aperture, miniaturization, high-quality imaging, etc., which greatly improves the user experience effect. At the same time, since the focusing stroke required for the telephoto lens to focus is relatively small, it is also conducive to reducing the volume of the motor used to drive the second lens group to move, making it easier to miniaturize the camera module.

[0138] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0139] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, characterized in that: It sequentially includes from the object side to the imaging plane along the optical axis: a first group with positive optical power, a second group with positive optical power, and a third group with negative optical power; The first group consists of a first catadioptric lens with positive optical power. The first catadioptric lens includes an incident surface, a reflecting surface, and an exit surface. The incident surface of the first catadioptric lens is convex, and the exit surface of the first catadioptric lens is convex; the reflecting surface of the first catadioptric lens forms an angle of 45° with the optical axes of the incident surface and the exit surface of the first catadioptric lens respectively; The second group consists of three lenses, and sequentially includes from the object side to the imaging plane: a second lens with optical power, a third lens with optical power, and a fourth lens with optical power; The object side surface of the third lens is convex; The third group consists of three lenses, and sequentially includes from the object side to the imaging plane: a fifth lens with optical power, a sixth lens with negative optical power, and a seventh lens with optical power; The object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; The object side surface of the sixth lens is concave; The image side surface of the seventh lens is concave; The second group can be dynamically moved on the optical axis to achieve the switching of the optical lens between the telephoto state and the macro state; Among them, the effective focal length fl of the optical lens in the telephoto state and the effective focal length fm of the optical lens in the macro state satisfy: 1.28 < fl / fm < 1.

38.

2. The optical lens according to claim 1, characterized in that: The focal length fQ1 of the first group and the effective focal length fl of the optical lens in the telephoto state satisfy: 1 < fQ1 / fl < 1.

9.

3. The optical lens according to claim 1, characterized in that: The focal length fQ2 of the second group and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.4 < fQ2 / fl < 0.

85.

4. The optical lens according to claim 1, characterized in that: The focal length fQ3 of the third group and the effective focal length fl of the optical lens in the telephoto state satisfy: -0.5 < fQ3 / fl < -0.

3.

5. The optical lens according to claim 1, characterized in that: The focal length f5 of the fifth lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -1 < f5 / fl < 1.

6. The optical lens according to claim 1, characterized in that: The focal length f6 of the sixth lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -2.5 < f6 / fl < -0.

25.

7. The optical lens according to claim 1, characterized in that: The focal length f7 of the seventh lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -0.8 < f7 / fl < 0.

8.

8. The optical lens according to claim 1, characterized in that: The overall optical length TTL of the optical lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 1.52 < TTL / fl < 1.65; the overall optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 2.9 < TTL / IH < 3.

2.

9. The optical lens according to claim 1, characterized in that: When the optical lens switches from the telephoto state with an infinite object distance to the macro state with an object distance of 10 cm, the focusing stroke CTw of the second group satisfies: 1 mm < CTw < 2.1 mm.

10. The optical lens according to claim 1, characterized in that: The minimum axial gap DT1w between the second group and the first group in different states satisfies: 0.2 mm < DT1w < 0.55 mm; the minimum axial gap DT2w between the second group and the third group in different states satisfies: 0.33 mm < DT2w < 0.45 mm.

11. The optical lens according to claim 1, characterized in that: The combined focal length fQ12 of the first group and the second group in the telephoto state and the combined focal length fQ12' of the first group and the second group in the macro state satisfy: 1 < fQ12 / fQ12' < 1.1.

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