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 two lenses, and sequentially includes a second lens with negative optical power and a third lens with positive optical power from the object side to the imaging surface; the third group consists of two lenses, and sequentially includes a fourth lens with optical power and a fifth lens with optical power from the object side to the imaging surface, and one of the lenses has positive optical power and the other has negative optical power; 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 continuously 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. The shooting functions for multiple scenarios can be achieved by moving some lens groups on the same lens. However, the amount of movement 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 thinning of mobile devices. Therefore, to solve this problem, it is necessary to develop a lens with a small amount of movement 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 including from the object side to the imaging surface 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;

[0006] The first group is composed of a first catadioptric lens with positive optical 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 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;

[0007] The second group is composed of two lenses, sequentially including from the object side to the imaging surface a second lens with negative optical power and a third lens with positive optical power;

[0008] The object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

[0009] The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

[0010] The third group is composed of two lenses, sequentially including from the object side to the imaging surface a fourth lens with optical power and a fifth lens with optical power, and one of the lenses has positive optical power and the other lens has negative optical power;

[0011] The object side of the fourth lens is concave, and the image side of the fourth lens is convex;

[0012] The object side of the fifth lens is convex, and the image side of the fifth lens is concave;

[0013] The second lens 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;

[0014] 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: 1.1 < fl / fm < 1.2.

[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 interval distance between different lens groups and setting a catadioptric element with a diopter, and can achieve the excellent effect of compatibility between periscope telephoto shooting and macro shooting, and has 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 focusing lens group to move, making it easier to miniaturize the camera module. Description of the Drawings

[0016] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0017] Figure 1 It is a schematic structural diagram of the optical lens in the telephoto state in Embodiment 1 of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the optical lens in the macro state in Embodiment 1 of the present invention.

[0019] Figure 3 It is an axial aberration curve graph and a lateral chromatic aberration curve graph of the optical lens in the telephoto state in Embodiment 1 of the present invention.

[0020] Figure 4 It is an axial aberration curve graph and a lateral chromatic aberration curve graph of the optical lens in the macro state in Embodiment 1 of the present invention.

[0021] Figure 5 It is a schematic structural diagram of the optical lens in the telephoto state in Embodiment 2 of the present invention.

[0022] Figure 6 It is a schematic structural diagram of the optical lens in the macro state in Embodiment 2 of the present invention.

[0023] Figure 7It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the telephoto state in Embodiment 2 of the present invention.

[0024] Figure 8 It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the macro state in Embodiment 2 of the present invention.

[0025] Figure 9 It is the structural schematic diagram of the optical lens in the telephoto state in Embodiment 3 of the present invention.

[0026] Figure 10 It is the structural schematic diagram of the optical lens in the macro state in Embodiment 3 of the present invention.

[0027] Figure 11 It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the telephoto state in Embodiment 3 of the present invention.

[0028] Figure 12 It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the macro state in Embodiment 3 of the present invention.

[0029] Figure 13 It is the structural schematic diagram of the optical lens in the telephoto state in Embodiment 4 of the present invention.

[0030] Figure 14 It is the structural schematic diagram of the optical lens in the macro state in Embodiment 4 of the present invention.

[0031] Figure 15 It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the telephoto state in Embodiment 4 of the present invention.

[0032] Figure 16 It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the macro state in Embodiment 4 of the present invention.

[0033] Figure 17 It is the structural schematic diagram of the optical lens in the telephoto state in Embodiment 5 of the present invention.

[0034] Figure 18 It is the structural schematic diagram of the optical lens in the macro state in Embodiment 5 of the present invention.

[0035] Figure 19 [[ID=~48]]It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the telephoto state in Embodiment 5 of the present invention.

[0036] Figure 20 It is the axial aberration curve graph and lateral chromatic aberration curve graph of the optical lens in the macro state in Embodiment 5 of the present invention.

[0037] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Detailed implementation manners

[0038] To better understand the present application, various aspects of the present application will be described in more detail 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 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.

[0039] 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.

[0040] In the drawings, for ease of illustration, the thickness, size, 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.

[0041] 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 to be 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.

[0042] It should also be understood that the terms "comprise", "comprising", "have", "including" and / or "including having", 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 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. In addition, 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.

[0043] Unless otherwise defined, all terms (including technical and scientific terms) used herein shall 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) shall 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.

[0044] It should be noted that, without conflict, the embodiments and features in the embodiments of this application may be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0045] 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 focuses; 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 focuses 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 and the first group and the third group on the optical axis of the present invention is variable. 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.

[0046] 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 can be concave or 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 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.

[0047] The second group is composed of two lenses, which sequentially include a second lens with negative optical power and a third lens with positive optical power from the object side to the imaging surface. Among them, the object side of the second lens is convex, and the image side of the second lens is concave; the object side of the third lens is convex, and the image side of the third lens is convex.

[0048] The third lens group consists of two lenses, which successively include a fourth lens with a focal power and a fifth lens with a focal power from the object side to the imaging surface, and one of the lenses has a positive focal power and the other has a negative focal power. It can be understood that when the fourth lens has a positive focal power, the fifth lens has a negative focal power. When the fourth lens has a negative focal power, the fifth lens has a positive focal power. The object side surface of the fourth lens is concave, and the image side surface of the fourth lens is convex. The object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave.

[0049] In some embodiments, the first catadioptric lens adopts an integrally formed structure and can adopt a catadioptric prism structure for deflecting light. Specifically, it can be 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 providing advantages for realizing 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 deflect by 90°. Then it passes through the second lens, the third lens, the fourth lens, and the fifth 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.

[0050] In some embodiments, the optical lens may further include a diaphragm, which is placed on the surface of the incident surface of the first catadioptric lens. The front placement of the diaphragm is beneficial in reducing the surface type size of the catadioptric lens, lowering its manufacturing cost and difficulty, and improving the product qualification rate. On the other hand, it can ensure that the diaphragm remains stationary during the focusing process of the lens, ensuring that the system has a large light input.

[0051] In some embodiments, the optical lens may further include a filter, which is disposed between the fifth 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.

[0052] 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: 1.1 < fl / fm < 1.2. 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.

[0053] 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: 0.8 < fQ1 / fl < 4.5. 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 is no longer the maximum limit of the light passing aperture of the telephoto lens, effectively increasing the light passing aperture and facilitating the realization of the large aperture performance of the lens.

[0054] 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: 0.5 < fQ2 / fl < 1. 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 travel; the smaller focusing travel 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.

[0055] 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: -0.85 < fQ3 / fl < -0.7. 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.

[0056] In some embodiments, the focal length f2 of the second lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -1.6 < f2 / fl < -0.5; the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 1.5 < R3 / R4 < 3. Meeting the above conditions, the incident light can be greatly diverged, 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 f3 of the third lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.25 < f3 / fl < 0.6; the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: -4 < R5 / R6 < -0.4. Meeting the above conditions, the third lens has a strong positive refractive power and a biconvex surface type, which can effectively converge the light beam emitted from the catadioptric lens, is beneficial to correcting various aberrations generated in the front lens group, and is also beneficial to realizing the telephoto performance of the lens.

[0058] 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: 0.7 mm < CTw < 1.2 mm. CTw: focusing travel, which 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 aberration caused by focusing, endow the telephoto lens with a stronger focusing ability, thus having a higher imaging quality and a stronger macro ability. At the same time, since the focusing travel 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.

[0059] In some embodiments, the radius of curvature R1 of the incident surface of the first catadioptric lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.5 < R1 / fl < 2.5. By reasonably setting the radius of curvature of the incident surface of the first catadioptric lens, a large range of light entering the system can be better converged, enabling the light to enter the subsequent optical system with a smaller aperture, which is conducive to achieving the large aperture performance of the lens; at the same time, it can also avoid the generation of strong total reflection ghosts due to excessive deflection angles of the light in the catadioptric lens.

[0060] In some embodiments, the minimum axial gap DT1w between the second group and the first group in different states satisfies: 0.26 mm < DT1w < 0.33 mm; the minimum axial gap DT2w between the second group and the third group in different states satisfies: 0.26 mm < DT2w < 0.9 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 sufficient space 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 process.

[0061] 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' < 1.06. Satisfying the above conditional formula indicates that during the focusing process of the optical lens switching from infinity to macro, as the second group moves 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 smaller focusing stroke can achieve the focusing process of the lens from telephoto to macro at 10 cm.

[0062] In some embodiments, the focal length fQ1 of the first group and the focal length fQ2 of the second group satisfy: 0.8 < fQ1 / fQ2 < 8; the focal length fQ2 of the second group and the focal length fQ3 of the third group satisfy: -1.4 < fQ2 / fQ3 < -0.7. Satisfying the above conditions, by reasonably allocating 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 increased, and at the same time, the deflection angle of light in different focusing states of the optical system can be reduced, which helps to correct the optical aberration and ensure that the lens has a high imaging quality in different focusing states.

[0063] 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: 1.5 < TTL / fl < 1.8. Satisfying the above conditions can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens.

[0064] 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: 2.6 < TTL / IH < 3. Satisfying the above conditions can better achieve the miniaturization of the lens, and at the same time, ensure that the lens has a larger image plane under the condition of the same overall length of the lens, and better achieve the high-definition imaging of the lens.

[0065] In some embodiments, the back focal length BFL of the optical lens and the overall optical length TTL of the optical lens satisfy: 0.12 < BFL / TTL < 0.16. Satisfying the above conditions can greatly compress the overall length of the lens, making the lens have the characteristics of miniaturization and small overall length.

[0066] In some embodiments, the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 0.2 < R7 / R8 < 1.5. Satisfying the above conditions is beneficial to the smooth transition of light, balance the aberration of the optical lens, and improve the imaging quality of the optical lens.

[0067] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: 0.5 < R9 / R10 < 4. Meeting the above conditions is beneficial to 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 f2 of the second lens and the focal length f3 of the third lens satisfy: -3 < f2 / f3 < -2. Meeting the above conditions, by reasonably setting the focal length relationship between the second and third lenses, it is beneficial to the smooth transition of light, and at the same time correct various aberrations of the optical lens and improve the imaging quality of the optical lens.

[0069] In some embodiments, the focal length f4 of the fourth lens and the focal length f5 of the fifth lens satisfy: -15 < f4 / f5 < -0.1. Meeting the above conditions can cause the light emerging from the focusing lens group to diverge to a certain extent, thereby effectively increasing the height of the light entering the imaging surface and better realizing the large target surface imaging of the lens.

[0070] 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: 30 < Vd1 < 60. Meeting the above conditions enables the catadioptric element to be made of plastic material and the reflective element to be integrally formed using an injection molding process, which is beneficial to reducing the weight and manufacturing cost of the catadioptric element and providing advantages for realizing larger prism anti-shake.

[0071] In some embodiments, the true image height IH corresponding to the maximum field of view angle of the optical lens and the F-number Fno of the optical lens satisfy: [4.2mm < IH / Fno < 4.3mm]. Meeting the above conditions, by controlling the F-number and image height of the lens, it is possible to have a larger light passing amount while ensuring that the optical lens has a large image surface, which is beneficial to the realization of optical anti-shake technology in the periscope telephoto module and improves the imaging quality of the optical lens.

[0072] In some embodiments, the optical lens satisfies the conditional formula: 13 mm < fl < 14 mm, 11 mm < fm < 12 mm, 20 mm < TTL < 25 mm, 8 mm < IH < 8.3 mm; 1.85 < Fno < 1.95; 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 from the incident surface of the first catadioptric lens to the imaging surface along the optical axis, IH represents the true image height corresponding to the maximum field of view angle of the optical lens; Fno represents the aperture value of the optical lens. The focal length range of the optical lens of the present invention is 11 mm to 14 mm, and the maximum field of view angle range of the optical lens of the present invention is 32° to 34°. The optical lens provided by the embodiments of the present invention at least has the characteristics of miniaturization, a relatively large field of view angle, a large aperture, a large image plane, etc. 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.

[0073] 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 characteristics 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 enables the structure of the lens to be relatively compact, and can better achieve the balance of lens miniaturization and high image quality.

[0074] In some embodiments, the first catadioptric lens, the second lens, the third lens, the fourth lens, and the fifth 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 lens miniaturization. More specifically, the first catadioptric lens, the second lens, the third lens, the fourth lens, and the fifth 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 lens miniaturization.

[0075] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations:

[0076] ;

[0077] where z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface 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.

[0078] The present invention will be further described below with reference to multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are partially different. For specific differences, please refer to the parameter tables of each embodiment. The following embodiments are only the 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 all included in the protection scope of the present invention.

[0079] Embodiment 1

[0080] 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 and

[0081] 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 S13: a diaphragm ST, a first group with a positive optical power, a second group with a positive optical power, a third group with a negative optical power, and a filter G1.

[0082] The first group includes a first catadioptric lens L1. The first catadioptric lens L1 has a 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 concave 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.

[0083] The second group is a focusing lens group, which sequentially includes, from the object side to the imaging surface: a second lens L2 and a third lens L3.

[0084] Among them, the second lens L2 has a negative optical power, its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface;

[0085] The third lens L3 has a positive optical power, its object side surface S5 is a convex surface, and its image side surface S6 is a convex surface;

[0086] The third group sequentially includes, from the object side to the imaging surface: a fourth lens L4 and a fifth lens L5.

[0087] The fifth lens L5 has a negative optical power. Its object side S9 is convex near the optical axis, and its image side S10 is concave.

[0088] The first catadioptric lens L1 is an injection-molded integrated structure, and the design of a catadioptric prism can be adopted, specifically a right-angled triangular prism.

[0089] The first catadioptric lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all plastic aspherical lenses.

[0090] The relevant parameters of each lens in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0091] Table 1-1

[0092]

[0093] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0094] Table 1-2

[0095]

[0096] Among them, in Table 1-1 above, H1 is the air gap between the aperture stop ST and the object to be photographed 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. In this application, the zoom switching between the telephoto state and the macro state of the optical lens is achieved by changing the air gaps H2 and H3.

[0097] 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 from the image side to the object side along the optical axis, and the focusing stroke (i.e., the movement amount of the second group) is 1.036 mm.

[0098] The parameters of the optical lens 100 in Embodiment 1 in the telephoto state and the 10-cm macro state are shown in Table 1-3.

[0099] Table 1-3

[0100]

[0101] As shown in Table 1-3, when the focusing object distance of the optical lens is infinite (i.e., the telephoto state, H1 is infinite), at this time H2 is 1.33 mm, and H3 is 0.3 mm, corresponding Figure 1The optical structure of the optical lens in the telephoto state. 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 0.294 mm, and H3 is 1.336 mm, corresponding to Figure 2 The optical structure of the optical lens in the 10-cm macro state.

[0102] Figure 3 (A) in Figure 4 (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 ±0.02 mm, indicating that the optical lens 100 can correct the axial aberration well in both the telephoto and macro states.

[0103] Figure 3 (B) in Figure 4 (B) in are respectively the lateral 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 lateral 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.

[0104] 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.

[0105] Embodiment 2

[0106] Please refer to Figure 5 and Figure 6 , which respectively show 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 that: the fourth lens L4 has a negative optical power; the fifth lens L5 has a positive optical power; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0107] The relevant parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0108] Table 2-1

[0109]

[0110] The surface shape parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0111] Table 2-2

[0112]

[0113] Among them, in Table 2-1 above, H1 is the air gap on the optical axis between the diaphragm ST 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.

[0114] 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 of the optical lens between the telephoto state and the macro state. 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 0.840 mm.

[0115] The parameters of the optical lens 200 in this Embodiment 2 in the telephoto state and the 10-cm macro state are shown in Table 2-3.

[0116] Table 2-3

[0117]

[0118] As shown in Table 2-3, when the focusing object distance of the optical lens is infinite (i.e., the telephoto state, H1 is infinite), at this time H2 is 1.134 mm, and H3 is 0.442 mm, corresponding to Figure 5 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 0.294 mm, and H3 is 1.262 mm, corresponding to Figure 6 the optical structure of the optical lens in the 10-cm macro state.

[0119] Figure 7 (A) in Figure 8 and (A) in

[0120] Figure 7 are respectively the axial aberration curve graphs of the optical lens 200 in this embodiment in the telephoto state and the macro state. 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 8Among them, (B) are respectively the longitudinal chromatic aberration curve graphs 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 chromatic aberrations of the longest wavelength and the shortest wavelength are both controlled within ±1.5 μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0121] It can be seen from the above figures that the aberrations of the optical lens in Embodiment 2 in the telephoto state and the macro state are well balanced, and both have good optical imaging quality.

[0122] Embodiment 3

[0123] Please refer to Figure 9 and Figure 10 , which respectively show 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 difference in this embodiment is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0124] The relevant parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0125] Table 3-1

[0126]

[0127] The surface type parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0128] Table 3-2

[0129]

[0130] Among them, in Table 3-1 above, H1 is the air gap on the optical axis between the aperture stop ST 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.

[0131] 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 1.012 mm.

[0132] 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.

[0133] Table 3-3

[0134]

[0135] As shown in Table 3-3, when the focusing object distance of the optical lens is infinity (i.e., the telephoto state, H1 is infinity), at this time H2 is 1.298 mm, and H3 is 0.291 mm, corresponding to Figure 9 the optical structure of the optical lens in the telephoto state in Figure 10 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 0.286 mm, and H3 is 1.303 mm, corresponding to

[0136] Figure 11 the (A) in Figure 12 and the (A) in

[0137] Figure 11 are respectively the 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 ±0.03 mm, indicating that the optical lens 300 can correct the axial aberration well. Figure 12 The (B) in

[0138] and the (B) in

[0139] are respectively the lateral 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 lateral chromatic aberration between the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can correct the chromatic aberration well.

[0138] It can be seen from the above figures that the aberrations of the optical lens in Embodiment 3 in the telephoto state and the macro state are well balanced, and both have good optical imaging quality.

[0139] Embodiment 4

[0140] Please refer to Figure 13 and Figure 14 , which are respectively the structural schematic diagrams of the optical lens 400 provided in Embodiment 4 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 negative optical power; the fifth lens L5 has a positive optical power; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0141] The relevant parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0142] Table 4-1

[0143]

[0144] The surface parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0145] Table 4-2

[0146]

[0147] Among them, in Table 4-1 above, H1 is the air gap on the optical axis between the aperture stop ST 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.

[0148] 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 of the optical lens between the telephoto state and the macro state. 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 0.782 mm.

[0149] The parameters of the optical lens 400 in Embodiment 4 in the telephoto state and the 10-cm macro state are shown in Table 4-3.

[0150] Table 4-3

[0151]

[0152] 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 1.071 mm, and H3 is 0.940 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 0.289 mm, and H3 is 1.722 mm, corresponding to Figure 14 the optical structure of the optical lens in the 10-cm macro state.

[0153] Figure 15 In (A) of Figure 16 and (A) of

[0154] Figure 15 In (B) of Figure 16Among them, (B) 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 vertical 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.

[0155] 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.

[0156] Example 5

[0157] 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: the fourth lens L4 has a negative optical power; the fifth lens L5 has a positive optical power; the exit surface S2 of the first catadioptric lens L1 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0158] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0159] Table 5-1

[0160]

[0161] The aspheric lens surface type parameters of the optical lens 500 in Example 5 are shown in Table 5-2.

[0162] Table 5-2

[0163]

[0164] Among them, in Table 5-1 above, H1 is the air gap between the aperture stop ST 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. In this application, the zoom switching of the optical lens in the telephoto state and the macro state is achieved by changing the air gaps H2 and H3.

[0165] 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 movement amount of the second group) is 1.005 mm.

[0166] The parameters of the optical lens 500 of this embodiment 5 in the telephoto state and the 10cm macro state are shown in Table 5-3.

[0167] Table 5-3

[0168]

[0169] 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 1.317 mm and H3 is 0.542 mm, corresponding to Figure 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 0.312mm, and H3 is 1.547mm, corresponding to Figure 18 The optical structure of the optical lens in the 10cm macro state.

[0170] Figure 19 (A) and Figure 20 Graphs (A) in the figure show the axial aberration curves of the optical lens 500 in the telephoto and macro states, respectively. As can be seen from the graph, the offset of the axial aberration is controlled within ±0.03 mm, indicating that the optical lens 500 is able to effectively correct the axial aberration.

[0171] Figure 19 (B) and Figure 20 Graphs (B) in the figure show the magnification chromatic aberration curves for the optical lens 500 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 ±2μm, demonstrating that the optical lens 500 is capable of effectively correcting chromatic aberration.

[0172] From the above figures, it can be seen 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.

[0173] 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 propagation path length of light along the optical axis from the incident surface of the first catadioptric 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.

[0174] Table 6

[0175]

[0176] In summary of the above embodiments, the optical lens provided by the present invention has the following advantages:

[0177] 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 catadioptric element with a diopter, the zoom switch of the lens from the telephoto state to the macro state can be realized, and the excellent effect of compatible periscope telephoto shooting and macro shooting can be achieved. 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 used to drive the movement of the second lens group, making it easier to miniaturize the camera module.

[0178] 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 a suitable manner in any one or more embodiments or examples.

[0179] 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 reflective surface, and an exit surface. The incident surface of the first catadioptric lens is a convex surface; the reflective 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 two lenses, and sequentially includes from the object side to the imaging plane a second lens with negative optical power and a third lens with positive optical power; The object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; The third group consists of two lenses, and sequentially includes from the object side to the imaging plane a fourth lens with optical power and a fifth lens with optical power, and one of the lenses has positive optical power and the other lens has negative optical power; The object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; The object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; 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; 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: 1.1 < fl / fm < 1.

2.

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: 0.8 < fQ1 / fl < 4.

5.

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: 0.5 < fQ2 / fl < 1.

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: -0.85 < fQ3 / fl < -0.

7.

5. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens and the effective focal length fl of the optical lens in the telephoto state satisfy: -1.6 < f2 / fl < -0.5; the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.5 < R3 / R4 < 3.

6. The optical lens according to claim 1, wherein The focal length f3 of the third lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.25 < f3 / fl < 0.6; the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -4 < R5 / R6 < -0.

4.

7. 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: 0.7 mm < CTw < 1.2 mm.

8. The optical lens according to claim 1, characterized in that, The curvature radius R1 of the incident surface of the first catadioptric lens and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.5 < R1 / fl < 2.

5.

9. 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: 0.26 mm < DT1w < 0.33 mm; the minimum axial gap DT2w between the second group and the third group in different states satisfies: 0.26 mm < DT2w < 0.9 mm.

10. 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' < 1.06.

Images