Optical lens

Abstract

The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: 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 second group consists of three lenses, which sequentially include a second lens with optical power, a third lens with optical power, and a fourth lens with optical power from the object side to the imaging surface; the third group consists of three lenses, which sequentially include a fifth lens with optical power, a sixth lens with negative optical power, and a seventh lens with optical power from the object side to the imaging surface; the second group can move dynamically on the optical axis to achieve the switching of the optical lens between the telephoto state and the macro state. The optical lens provided by the present invention can achieve the zoom switching of the lens from the telephoto state to the macro state, and can achieve the excellent effect of compatibility between periscope telephoto shooting and macro shooting.

Description

Technical Field

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

[0002] With the popularization of intelligent mobile devices such as smart phones, and in order to meet the pursuit of obtaining better shooting effects in different scenarios, the functions of imaging modules are constantly being improved and expanded. Among them, periscope telephoto lenses with longer focal lengths are also gradually mounted on mobile terminals to meet the shooting requirements for distant views. Implementing the shooting functions of multiple scenarios on the same lens can be achieved by moving some lens groups. However, the movement amount of the lens groups is often large, resulting in an increase in the size of the imaging module and making it impossible to achieve the thin and light design of mobile devices. Therefore, in order to solve this problem, it is necessary to develop a lens with a small movement amount of the lens group and high performance in multiple shooting scenarios. Summary of the Invention

[0003] Aiming at the above problems, the purpose of the present invention is to provide an optical lens that can achieve zoom switching from a telephoto state to a macro state, greatly improving the user experience.

[0004] The technical solution adopted by the present invention is as follows:

[0005] An optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first group with positive optical power, a second group with positive optical power, and a third group with negative optical power;

[0006] The first group is composed 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;

[0007] The second group is composed of three lenses, and sequentially includes a second lens with optical power, a third lens with optical power, and a fourth lens with optical power from the object side to the imaging surface;

[0008] The object side surface of the third lens is convex;

[0009] The third group is composed of three lenses, and sequentially includes a fifth lens with optical power, a sixth lens with negative optical power, and a seventh lens with optical power from the object side to the imaging surface;

[0010] The object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex;

[0011] The object side surface of the sixth lens is concave;

[0012] The image side of the seventh lens is concave;

[0013] 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;

[0014] Wherein, 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 interval distance between different lens groups and setting a catadioptric element with a diopter, and can achieve excellent effects compatible with periscope telephoto shooting and macro shooting. It has one or more advantages such as a large target surface, a large aperture, miniaturization, and high-quality imaging, greatly improving the user experience. At the same time, since the focusing stroke required for the telephoto lens to focus is small, it is also beneficial to reduce the volume of the motor for driving the focusing lens group to move, making it easier to miniaturize the camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0027] Figure 1 is a schematic structural diagram of the optical lens in the telephoto state in Embodiment 1 of the present invention.

[0028] Figure 2 is a schematic structural diagram of the optical lens in the macro state in Embodiment 1 of the present invention.

[0029] Figure 3 is the axial aberration curve diagram, lateral chromatic aberration curve diagram, and distortion curve diagram of the optical lens in the telephoto state in Embodiment 1 of the present invention.

[0030] Figure 4 is the axial aberration curve diagram, lateral chromatic aberration curve diagram, and distortion curve diagram of the optical lens in the macro state in Embodiment 1 of the present invention.

[0031] Figure 5 is a schematic structural diagram of the optical lens in the telephoto state in Embodiment 2 of the present invention.

[0032] Figure 6 is a schematic structural diagram of the optical lens in the macro state in Embodiment 2 of the present invention.

[0033] Figure 7Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the telephoto state in Embodiment 2 of the present invention.

[0034] Figure 8 Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the macro state in Embodiment 2 of the present invention.

[0035] Figure 9 Schematic structural diagram of the optical lens in the telephoto state in Embodiment 3 of the present invention.

[0036] Figure 10 Schematic structural diagram of the optical lens in the macro state in Embodiment 3 of the present invention.

[0037] Figure 11 Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the telephoto state in Embodiment 3 of the present invention.

[0038] Figure 12 Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the macro state in Embodiment 3 of the present invention.

[0039] Figure 13 Schematic structural diagram of the optical lens in the telephoto state in Embodiment 4 of the present invention.

[0040] Figure 14 Schematic structural diagram of the optical lens in the macro state in Embodiment 4 of the present invention.

[0041] Figure 15 Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the telephoto state in Embodiment 4 of the present invention.

[0042] Figure 16 Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the macro state in Embodiment 4 of the present invention.

[0043] Figure 17 Schematic structural diagram of the optical lens in the telephoto state in Embodiment 5 of the present invention.

[0044] Figure 18 Schematic structural diagram of the optical lens in the macro state in Embodiment 5 of the present invention.

[0045] Figure 19 Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the telephoto state in Embodiment 5 of the present invention.

[0046] Figure 20 Axial aberration curve, lateral chromatic aberration curve, and distortion curve of the optical lens in the macro state in Embodiment 5 of the present invention.

[0047] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0048] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application and do not 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.

[0049] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0050] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0051] In this document, 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 being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0052] It should also be understood that the terms "comprises", "comprising", "has", "including", and / or "including having", when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features rather than an individual element in the list. Further, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0053] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0054] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0055] The optical lens provided by the embodiment of the present invention is a periscope zoom lens, which sequentially includes, along the optical axis from the object side to the imaging surface: 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 and the third group are fixed lens groups, and the fixed lens groups do not move when the optical lens is focused; the second group is a focusing lens group, and the second group (focusing lens group) can move dynamically 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 gap between the second group of the present invention and the first group and the third group is variable on the optical axis. By changing the air gap distance between different groups, the zoom switching of the lens from the telephoto state to the macro state can be realized.

[0056] Specifically, the first group is composed 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, the exit surface of the first catadioptric lens is convex, and the reflecting surface of the first catadioptric lens is flat. 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. By setting the first catadioptric lens with a diopter, the 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-thinness of portable electronic devices such as mobile phones.

[0057] The second group is composed of three lenses, which sequentially include a second lens with optical power, a third lens with optical power, and a fourth lens with optical power from the object side to the imaging surface. The second lens may have positive or negative optical power, the object side surface of the second lens may be concave or convex, and the image side surface of the second lens may be concave or convex. The third lens may have positive or negative optical power, the object side surface of the third lens is convex, and the image side surface of the third lens may be concave or convex. The fourth lens may have positive or negative optical power, the object side surface of the fourth lens may be concave or convex, and the image side surface of the fourth lens may be concave or convex.

[0058] The third lens group consists of three lenses, which sequentially include a fifth lens with a focal power, a sixth lens with a negative focal power, and a seventh lens with a focal power from the object side to the imaging surface. The fifth lens may have a positive or negative focal 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 a positive or negative focal 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.

[0059] In some embodiments, the first catadioptric lens adopts an integrally formed structure and may adopt a catadioptric prism structure for bending light rays, 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 surface, 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, reflection occurs on the reflecting surface of the first catadioptric lens, causing the optical axis to turn by 90°. Then, it sequentially passes through the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens, and finally undergoes the filtering process of the filter to complete image acquisition on the photosensitive chip (imaging surface), achieving a periscope imaging effect.

[0060] 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 lens group, or can be realized by a spraying process on the surface of the second lens.

[0061] 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.

[0062] 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 longer 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.

[0063] 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, when the incident light beam reaches the subsequent lens group after being reflected by the reflecting element, it has been greatly contracted and the beam diameter is small. Therefore, the subsequent lens group no longer becomes the maximum limitation of the light passing aperture of the telephoto lens, effectively increasing the light passing aperture and achieving the large aperture performance of the lens.

[0064] 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 lens can complete focusing on different object distances by moving 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.

[0065] 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 well correct the aberration of the front focusing group in different focusing states and ensuring that the lens has a high imaging quality in different focusing states.

[0066] 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.

[0067] 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 greatly diverge the incident light, thereby effectively increasing the height of the light entering the imaging surface and better realizing the large target surface imaging of the lens.

[0068] 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 better correct various aberrations of the system and improve the imaging quality of the lens.

[0069] 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.

[0070] In some embodiments, 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. Meeting the above conditions can better achieve the miniaturization of the lens. At the same time, when the overall length of the lens is the same, it has a larger image plane, and can better achieve high-definition imaging of the lens.

[0071] In some embodiments, 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 travel CTw of the second group satisfies: 1 mm < CTw < 2.1 mm. The focusing travel refers to the movement amount of the focusing lens group (the second group) on the optical axis when the lens switches from the telephoto state to the macro state. Meeting the above conditions can make the lens have a smaller focusing travel, effectively suppress the deterioration of aberrations caused by focusing, enable the telephoto lens to have a strong focusing ability, and thus have a high imaging quality and a strong macro ability. At the same time, since the focusing travel required for the telephoto lens to focus is small, 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.

[0072] 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 telephoto 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 telephoto 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 telephoto state; the axial gap DT2wl between the second group and the third group in the telephoto 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 is possible to better ensure that there is enough space reserved for the installation of the focusing motor for driving the second group to move, and also prevent structural interference between the focusing lens group and the front and rear fixed groups during the movement.

[0073] 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 overall effective focal length of the lens also decreases. A smaller focusing stroke can achieve the focusing process of the lens from telephoto to macro at 10 cm.

[0074] 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 beneficial for the optical lens to stably capture light rays at different object distances and different angles, and improve the stability of the optical lens during the focusing process.

[0075] 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 under 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 under different focusing states.

[0076] In some embodiments, the radius of curvature R1 of the incident surface of the first catadioptric lens and the radius of curvature 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 radii of curvature of the incident surface and the exit surface of the first catadioptric lens, a large range of light rays entering the system can be better converged and turned, enabling the light rays to enter the subsequent optical system smoothly and improving the overall imaging quality.

[0077] 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, after the incident light rays are effectively converged by the first catadioptric lens, the light rays can enter the subsequent lens with a smaller aperture, reducing the thickness of the lens on the imaging device it is mounted on, and better realizing the miniaturization of the lens volume.

[0078] 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. Meeting the above conditions, by setting the first lens (the first catadioptric lens) to have a larger aperture, during the focusing process of the lens from telephoto to macro, a large range of light rays can be ensured to enter the system, ensuring that the lens has a large light flux under different focusing states and realizing the large aperture performance of the lens.

[0079] 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. Meeting 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 large prism anti-shake.

[0080] In some embodiments, the optical lens satisfies the conditional expressions: 22 mm < fl < 23 mm, 16 mm < fm < 17.5 mm, 34 mm < TTL < 36 mm, 11.2 mm < IH < 11.6 mm; 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 16 mm to 23 mm, 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 plane. At the same time, the optical lens of the present invention uses the same large-format sensor in both the telephoto and macro states, ensuring high-quality imaging quality.

[0081] In some embodiments, the lens material of 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. On the other hand, 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 between the miniaturization of the lens and high image quality.

[0082] In some embodiments, the first catadioptric lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens. More specifically, the first catadioptric lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens of the present invention can all adopt aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better realizing the miniaturization of the lens.

[0083] In each embodiment of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0084] ;

[0085] where z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and B, C, D, E, F, G, H are the surface coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order, and sixteenth order respectively.

[0086] The present invention will be further described in multiple embodiments below. In each embodiment, the thickness, curvature radius, and material selection of each lens in the optical lens are somewhat different. For specific differences, refer to the parameter tables of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing 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.

[0087] Embodiment 1

[0088] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention in the telephoto state, Figure 2 which is a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention in the macro state. The optical lens sequentially 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.

[0089] The first group includes a first catadioptric lens L1. The first catadioptric lens L1 has positive optical power and includes an incident surface S1, a reflecting surface R0, and an exit surface S2; its incident surface S1 is a convex surface, its exit surface S2 is a convex surface; both its incident surface S1 and exit surface S2 are aspherical surfaces, and the reflecting surface R0 is a plane. The reflecting surface R0 of the first catadioptric lens L1 forms an angle of 45° with the optical axes of its incident surface S1 and 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.

[0090] The second group is a focusing lens group, which sequentially includes, from the object side to the imaging surface: a diaphragm ST, a second lens L2, a third lens L3, and a fourth lens L4.

[0091] The second lens L2 has negative optical power. Its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface;

[0092] The third lens L3 has positive optical power. Its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface;

[0093] The fourth lens L4 has negative optical power. Its object side surface S7 is a concave surface, and its image side surface S8 is a concave surface near the optical axis;

[0094] The third group sequentially includes, from the object side to the imaging surface: a fifth lens L5, a sixth lens L6, and a seventh lens L7.

[0095] Among them, the fifth lens L5 has a positive focal power, its object side surface S9 is concave, and its image side surface S10 is convex;

[0096] The sixth lens L6 has a negative focal power, its object side surface S11 is concave, and its image side surface S12 is convex.

[0097] The seventh lens L7 has a negative focal power, its object side surface S13 is concave, and its image side surface S14 is concave.

[0098] The first catadioptric lens L1 is an injection-molded integral structure, and the design of a catadioptric prism can be adopted, specifically a right-angled triangular prism.

[0099] The first catadioptric 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.

[0100] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0101] Table 1-1

[0102]

[0103] The surface shape parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0104] Table 1-2

[0105]

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

[0107] Specifically, the first group and the third group in this application do not move during the focusing of the optical lens; the second group can move along the optical axis in the optical lens to complete the switching between the telephoto state and the macro state of the optical lens. 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 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.

[0108] The parameters of the optical lens 100 in this Embodiment 1 in the telephoto state and the 10 cm macro state are shown in Table 1-3.

[0109] Table 1-3

[0110]

[0111] As shown in Table 1-3, when the focusing object distance of the optical lens is infinity (i.e., in the telephoto state, H1 is infinity), at this time H2 is 2.348 mm and H3 is 0.912 mm, corresponding to the optical structure of the optical lens in the telephoto state in Figure 1 When the focusing distance of the optical lens is 10 cm (i.e., in the 10 cm macro state, H1 is 100 mm), then H2 is 0.378 mm and H3 is 2.882 mm, corresponding to the optical structure of the optical lens in the 10 cm macro state in Figure 2 The optical structure of the optical lens in the 10 cm macro state in

[0112] Figure 3 The (A) in Figure 4 The (A) in are respectively the axial aberration curves of the optical lens 100 in the telephoto state and the macro state in this embodiment. It represents 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 ±0.03 mm, indicating that the optical lens 100 can correct the axial aberration well in both the telephoto and macro states.

[0113] Figure 3 The (B) in Figure 4 The (B) in are respectively the longitudinal chromatic aberration curves of the optical lens 100 in the telephoto state and the macro state in this embodiment. It represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) at different image heights on the imaging plane. The horizontal axis represents the longitudinal 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 lateral chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, indicating that the optical lens 100 can correct the chromatic aberration well in both the telephoto and macro states.

[0114] Figure 3 The (C) in Figure 4 The (C) in are respectively the distortion curves of the optical lens 100 in the telephoto state and the macro state in this embodiment. It represents the distortion of light rays of different wavelengths at different image heights on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents 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 correct the distortion well in both the telephoto and macro states.

[0115] It can be seen from the above figures that the aberrations of the optical lens in Embodiment 1 in the telephoto state and the macro state are well balanced, and both have good optical imaging quality.

[0116] Embodiment 2

[0117] Please refer to Figure 5 and Figure 6 which are respectively the schematic structural diagrams of the optical lens 200 provided in Embodiment 2 of the present invention in the telephoto state and the macro state. Compared with Embodiment 1, the main differences are as follows: the second lens L2 has a positive optical power; the third lens L3 has a negative optical power; the fourth lens L4 has a positive optical power; the fifth lens L5 has a negative optical power; the seventh lens L7 has a positive optical power; the image side S6 of the third lens L3 is concave; the object side S7 of the fourth lens L4 is convex; the image side S8 of the fourth lens L4 is convex; the image side S12 of the sixth lens L6 is concave; the object side S13 of the seventh lens L7 is convex; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0118] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0119] Table 2-1

[0120]

[0121] The aspherical lens surface type parameters of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0122] Table 2-2

[0123]

[0124] Among them, in Table 2-1 above, H1 is the air gap on the optical axis between the first group and the object-side object to be photographed, H2 is the air gap on the optical axis between the first group and the second group (focusing lens group), and H3 is the air gap on the optical axis between the second group and the third group. The present application realizes the zoom switching of the optical lens between the telephoto state and the macro state by changing the air gaps H2 and H3.

[0125] Specifically, the first group and the third group in the present application do not move during the focusing of the optical lens; the second group can move along the optical axis in the optical lens to complete the switching between the telephoto state and the macro state of the optical lens. 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 second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the moving amount of the second group) is 1.213 mm.

[0126] The parameters of the optical lens 200 in Embodiment 2 in the telephoto state and the 10 cm macro state are shown in Table 2-3.

[0127] Table 2-3

[0128]

[0129] As shown in Table 2-3, when the focusing object distance of the optical lens is infinity (i.e., the telephoto state, H1 is infinity), at this time 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 in Figure 6 When the focusing distance of the optical lens is 10 cm (i.e., the 10 cm macro state, H1 is 100 mm), then H2 is 0.384 mm, and H3 is 1.874 mm, corresponding to

[0130] Figure 7 the (A) in Figure 8 the (A) in

[0131] Figure 7 are respectively the 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 ±0.03 mm, indicating that the optical lens 200 can correct the axial aberration well. Figure 8 The (B) in

[0132] Figure 7 and the (B) in Figure 8 are respectively the lateral 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 lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, indicating that the optical lens 200 can correct the chromatic aberration well.

[0133] It can be seen from the above figures that the aberrations of the optical lens in the telephoto state and the macro state in Embodiment 2 are well balanced, and both have good optical imaging quality.

[0134] Embodiment 3

[0135] Please refer to Figure 9 and Figure 10, which are respectively the structural schematic diagrams of the optical lens 300 provided in Embodiment 3 of the present invention in the telephoto state and the macro state. Compared with Embodiment 1, the main differences are as follows: The third lens L3 has a negative optical power; the fourth lens L4 has a positive optical power; the fifth lens L5 has a negative optical power; the seventh lens L7 has a positive optical power; the object side surface S3 of the second lens L2 is concave; the image side surface S4 of the second lens L2 is convex; the image side surface S6 of the third lens L3 is concave; the object side surface S7 of the fourth lens L4 is convex; the image side surface S8 of the fourth lens L4 is convex; the image side surface S12 of the sixth lens L6 is concave; the object side surface S13 of the seventh lens L7 is convex; the optical parameters such as the curvature radius and lens thickness of each lens surface are different.

[0136] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0137] Table 3-1

[0138]

[0139] The aspherical lens surface type parameters of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0140] Table 3-2

[0141]

[0142] Among them, in Table 3-1 above, H1 is the air gap on the optical axis between the first group and the object to be photographed on the object side, H2 is the air gap on the optical axis between the first group and the second group (focusing lens group), and H3 is the air gap on the optical axis between the second group and the third group. The present application realizes the zoom switching of the optical lens between the telephoto state and the macro state by changing the air gaps H2 and H3.

[0143] Specifically, the first group and the third group in the present application do not move during the focusing of the optical lens; the second group can move along the optical axis in the optical lens to complete the switching between the telephoto state and the macro state of the optical lens. 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 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.

[0144] The parameters of the optical lens 300 in Embodiment 3 in the telephoto state and the 10 cm macro state are shown in Table 3-3.

[0145] Table 3-3

[0146]

[0147] 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 Figure 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 Figure 10 The optical structure of the optical lens in the 10cm macro state.

[0148] Figure 11 (A) and Figure 12 Graphs (A) in the figure show the axial aberration curves of the optical lens 300 in the telephoto and macro states, respectively. As can be seen from the graphs, the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 300 is able to effectively correct the axial aberration.

[0149] Figure 11 (B) and Figure 12 Graphs (B) in the figure show the magnification chromatic aberration curves for the optical lens 300 in the telephoto and macro modes, respectively. As can be seen from the graph, the vertical chromatic aberration for both the longest and shortest wavelengths is controlled within ±1.5μm, demonstrating that the optical lens 300 is capable of effectively correcting chromatic aberration.

[0150] Figure 11 (C) and Figure 12 Figures (C) in the figure are distortion curves of the optical lens 300 in the telephoto and macro states, respectively. As can be seen from the figures, the distortion of the optical lens is controlled within ±1%, indicating that the optical lens 300 is able to effectively correct distortion.

[0151] 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.

[0152] Example 4

[0153] See also Figure 13 and Figure 14 , which are schematic structural diagrams of the optical lens 400 provided in Example 4 of the present invention in the telephoto state and the macro state, respectively. Compared with Example 1, this embodiment has the following main differences: the image-side surface S8 of the fourth lens L4 is convex; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0154] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0155] Table 4-1

[0156]

[0157] The surface parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0158] Table 4-2

[0159]

[0160] Among them, in Table 4-1 above, H1 is the air gap on the optical axis between the first group and the object-side object to be photographed, H2 is the air gap on the optical axis between the first group and the second group (focusing lens group), and H3 is the air gap on the optical axis between the second group and the third group. In this application, the zoom switching of the optical lens between the telephoto state and the macro state is achieved by changing the air gaps H2 and H3.

[0161] Specifically, the first group and the third group of this application do not move during the focusing of the optical lens; the second group can move along the optical axis in the optical lens to complete the switching between the telephoto state and the macro state of the optical lens. 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 second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the moving amount of the second group) is 1.895 mm.

[0162] The parameters of the optical lens 400 in this Embodiment 4 in the telephoto state and the 10-cm macro state are shown in Table 4-3.

[0163] Table 4-3

[0164]

[0165] As shown in Table 4-3, when the focusing object distance of the optical lens is infinite (i.e., the telephoto state, H1 is infinite), at this time, H2 is 2.212 mm and H3 is 0.892 mm, corresponding to Figure 13 the optical structure of the optical lens in the telephoto state. When the focusing distance of the optical lens is 10 cm (i.e., the 10-cm macro state, H1 is 100 mm), then H2 is 0.317 mm and H3 is 2.787 mm, corresponding to Figure 14 the optical structure of the optical lens in the 10-cm macro state.

[0166] Figure 15 The (A) in Figure 16 and the (A) in

[0167] Figure 15 The (B) in Figure 16 and the (B) in are respectively the longitudinal 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 lateral chromatic aberrations of the longest wavelength and the shortest wavelength are both controlled within ±1 μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0168] Figure 15 The (C) in Figure 16 and the (C) in are respectively the 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 distortion well.

[0169] It can be seen from the above figures that the aberrations of the optical lens in Example 4 in the telephoto state and the macro state are well balanced, and both have good optical imaging quality.

[0170] Example 5

[0171] Please refer to Figure 17 and Figure 18 , which are respectively the schematic structural diagrams of the optical lens 500 provided in Embodiment 5 of the present invention in the telephoto state and the macro state. Compared with Embodiment 1, the main differences are that: the fourth lens L4 has a positive optical power; the image side S8 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0172] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0173] Table 5-1

[0174]

[0175] The aspheric lens surface parameters of the optical lens 500 in Example 5 are shown in Table 5-2.

[0176] Table 5-2

[0177]

[0178] Among them, H1 in Table 5-1 above is the air gap on the optical axis between the first group and the object to be photographed on the object side, H2 is the air gap on the optical axis between the first group and the second group (focusing lens group), and H3 is the air gap on the optical axis between the second group and the third group. 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.

[0179] Specifically, the first group and the third group of the present application do not move during the focusing of the optical lens; the second group can move along the optical axis in the optical lens to complete the switching between the telephoto state and the macro state of the optical lens. 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 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.

[0180] 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.

[0181] Table 5-3

[0182]

[0183] As shown in Table 5-3, when the focusing object distance of the optical lens is infinite (i.e., the telephoto state, H1 is infinite), at this time H2 is 2.184 mm, and H3 is 0.530 mm, corresponding to Figure 17 the optical structure of the optical lens in the telephoto state. When the focusing distance of the optical lens is 10 cm (i.e., the 10-cm macro state, H1 is 100 mm), then H2 is 0.383 mm, and H3 is 2.331 mm, corresponding to Figure 18 the optical structure of the optical lens in the 10-cm macro state.

[0184] Figure 19 The (A) in Figure 20 and the (A) in

[0185] Figure 19 are respectively the 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 ±0.03 mm, indicating that the optical lens 500 can correct the axial aberration well. Figure 20 The (B) in

[0186] Figure 19 and the (B) in Figure 20 are respectively the longitudinal 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 lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±1 μm, indicating that the optical lens 500 can correct the chromatic aberration well.

[0187] As can be seen from the above figures, 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.

[0188] Please refer to Table 6 for 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 length of the propagation path of light along the optical axis from the incident surface of the first refractive-reflective lens to the imaging surface), the aperture value Fno, the true image height IH corresponding to the maximum field of view angle of the optical lens, the maximum field of view angle FOVl of the optical lens in the telephoto state, the maximum field of view angle FOVm of the optical lens in the macro state, the axial gap DT1wl between the second lens group and the first lens group in the telephoto state, the axial gap DT1wm between the second lens group and the first lens group in the macro state, the axial gap DT2wl between the second lens group and the third lens group in the telephoto state, the axial gap DT2wm between the second lens group and the third lens group in the macro state, and the values corresponding to each conditional expression in each embodiment.

[0189] Table 6

[0190]

[0191] Based on the above embodiments, the optical lens provided by the present invention has the following advantages:

[0192] The optical lens provided by the present invention can achieve good optical zoom. By changing the air interval distance between different lens groups and setting a refractive-reflective element with a diopter, it can achieve the zoom switching of the lens from the telephoto state to the macro state, and can achieve the excellent effect of compatibility between periscope telephoto shooting and macro shooting, having one or more advantages such as a large target surface, a large aperture, miniaturization, and high-quality imaging, greatly improving the user experience effect. At the same time, since the focusing stroke required for the telephoto lens to focus is small, it is also beneficial to reduce the volume of the motor used to drive the movement of the second lens group, making it easier to miniaturize the camera module.

[0193] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0194] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention shall be subject to the appended 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 realize 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, wherein 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, wherein 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, wherein 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, wherein 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, wherein, 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.

Images