Optical lens

Abstract

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

Description

Technical Field

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

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

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

[0004] The technical solution adopted by the present invention is: An optical lens, comprising, along 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 is composed of a first catadioptric lens with positive power, the first catadioptric lens includes an incident surface, a reflecting surface and an exiting surface, the incident surface of the first catadioptric lens is a convex surface; the reflecting surface of the first catadioptric lens forms an angle of 45° with the optical axes of the incident surface and the exiting surface of the first catadioptric lens respectively; The second group consists of two lenses, which include, from the object side to the imaging surface, 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, which include, from the object side to the imaging surface, a fourth lens having optical power and a fifth lens having optical power, wherein one lens 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 realize the switching of the optical lens between a telephoto state and a macro state; 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 the following conditions: 1.1 <fl / fm<1.2。

[0005] Compared with the prior art, the optical lens provided by the present invention can realize the zoom switching of the lens from the telephoto state to the macro state by changing the air spacing distance between different lens groups and setting a refractive element with a refractive power, and can achieve the excellent effect of compatibility between periscope telephoto shooting and macro shooting, and has one or more advantages such as large target surface, large aperture, miniaturization, high-quality imaging, etc., which greatly improves the user experience effect. At the same time, since the focusing stroke required for the telephoto lens to focus is relatively small, it is also beneficial to reduce the volume of the motor used to drive the focus lens group to move, making it easier to miniaturize the camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 1 of the present invention.

[0007] Figure 2 Schematic diagram of the structure of the optical lens in macro state in Embodiment 1 of the present invention.

[0008] Figure 3 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the telephoto state in Example 1 of the present invention.

[0009] Figure 4 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the macro state in Example 1 of the present invention.

[0010] Figure 5 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 2 of the present invention.

[0011] Figure 6 Schematic diagram of the structure of the optical lens in macro state in Embodiment 2 of the present invention.

[0012] Figure 7 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the telephoto state in Example 2 of the present invention.

[0013] Figure 8 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the macro state in Example 2 of the present invention.

[0014] Fig. 9 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 3 of the present invention.

[0015] Fig.10 Schematic diagram of the structure of the optical lens in macro state in Embodiment 3 of the present invention.

[0016] Fig.11 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the telephoto state in Example 3 of the present invention.

[0017] Fig.12 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the macro state in Example 3 of the present invention.

[0018] Fig.13 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 4 of the present invention.

[0019] Fig.14 Schematic diagram of the structure of the optical lens in macro state in Embodiment 4 of the present invention.

[0020] Fig.15 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the telephoto state in Example 4 of the present invention.

[0021] Fig.16 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the macro state in Example 4 of the present invention.

[0022] Fig.17 Schematic diagram of the structure of the optical lens in the telephoto state in Embodiment 5 of the present invention.

[0023] Fig.18 Schematic diagram of the structure of the optical lens in macro state in Embodiment 5 of the present invention.

[0024] Fig.19 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the telephoto state in Example 5 of the present invention.

[0025] Fig. 20 1 is an axial aberration curve diagram and a magnification chromatic aberration curve diagram of the optical lens in the macro state in Example 5 of the present invention.

[0026] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0027] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0029] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0030] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0031] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0032] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] The optical lens provided in the embodiment of the present invention is a periscope zoom lens, which includes: a first group with positive optical power, a second group with positive optical power, and a third group with negative optical power in sequence along the optical axis from the object side to the imaging surface. The first group and the third group are fixed lens groups, which do not move when the optical lens is focused; the second group is a focusing lens group, which can dynamically move on the optical axis when the optical lens is focused to realize the switching of the optical lens between the telephoto state and the macro state, that is, the air interval between the second group and the first group and the third group on the optical axis of the present invention is variable, and by changing the air interval distance between different groups, the zoom switching of the lens from the telephoto state to the macro state can be realized.

[0035] Specifically, the first group is composed of a first catadioptric lens with positive focal 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 exit surface of the first catadioptric lens can be a concave surface or a convex surface, and the reflective surface of the first catadioptric lens is a plane. 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. By setting a first catadioptric lens with refractive power, periscope imaging of the optical lens can be realized, and the length of the lens in the thickness direction of the electronic device can be greatly reduced, which can better meet the development trend of ultra-thin portable electronic devices such as mobile phones.

[0036] The second group consists of two lenses, including a second lens with negative optical power and a third lens with positive optical power from the object side to the image side. The object side surface of the second lens is convex, and the image side surface of the second lens is concave; the object side surface of the third lens is convex, and the image side surface of the third lens is convex.

[0037] The third group consists of two lenses, which include a fourth lens having optical power and a fifth lens having optical power in order from the object side to the imaging surface, and one of the lenses has positive optical power and the other lens has negative optical power. It can be understood that when the fourth lens has positive optical power, the fifth lens has negative optical power. When the fourth lens has negative optical power, the fifth lens has positive optical 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.

[0038] In some embodiments, the first catadioptric lens adopts an integrally formed structure and can adopt a catadioptric prism structure for deflecting light, specifically a right-angled triangular prism. Both the incident surface and the exit surface of the first catadioptric lens are aspherical, and the reflecting surface of the first catadioptric lens is a plane, which is beneficial to reducing the weight and manufacturing cost of the prism and 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 turn 90°. Then it passes through the second lens, the third lens, the fourth lens, and the fifth lens in sequence, and finally, after the filtering process of the filter, it reaches the photosensitive chip (imaging surface) to complete image acquisition, realizing a periscope imaging effect.

[0039] 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, during the focusing process of the lens, the diaphragm remains stationary, ensuring that the system has a large light input.

[0040] 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.

[0041] 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 enables the lens to have a relatively long focal length in both the telephoto and macro states, so as to better match a larger target surface sensor and ensure high-quality imaging.

[0042] In some embodiments, the focal length fQ1 of the first lens 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, the incident light beam can be greatly contracted when it reaches the subsequent lens group after being reflected by the reflecting element, and the beam diameter is small. Therefore, the subsequent lens group 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.

[0043] 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 relatively large positive refractive power, the lens can complete focusing on different object distances through the movement of the second group, which is beneficial to reducing the focusing stroke; a smaller focusing stroke can effectively suppress the deterioration of aberration caused by focusing, enabling the telephoto lens to have a strong focusing ability, thus having a high imaging quality and a strong macro ability.

[0044] 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 makes the third group have a relatively 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.

[0045] 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 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. 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.

[0046] 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 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. Meeting the above conditions, the third lens has a strong positive refractive power and a double convex surface type, which can effectively converge the light 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.

[0047] 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 stroke Ctw of the second group satisfies: 0.7 mm < Ctw < 1.2 mm. Ctw: focusing stroke, 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 stroke, effectively suppress the deterioration of aberration caused by focusing, enable the telephoto lens to have a strong focusing ability, thus having a high imaging quality and a strong macro ability. At the same time, since the focusing stroke required for the telephoto lens to focus is smaller, it is also beneficial to reducing the volume of the motor used to drive the movement of the second group, making it easier to miniaturize the camera module.

[0048] 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 beneficial to achieving the large aperture performance of the lens; at the same time, it can also prevent strong total reflection ghosts from being generated due to excessive deflection angles of the light in the catadioptric lens.

[0049] 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 that there is enough space reserved for the installation of the focusing motor for driving the second group to move, and it also prevents structural interference between the focusing lens group and the front and rear fixed groups during the movement.

[0050] 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. Meeting 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 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 by 10 cm.

[0051] 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. By satisfying the above conditions and 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. At the same time, the deflection angle of light in different focusing states of the optical system can be reduced, which helps to correct optical aberrations and ensure that the lens has high imaging quality in different focusing states.

[0052] 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. By satisfying the above conditions, the length of the lens can be effectively limited, which is beneficial to the miniaturization of the optical lens.

[0053] 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. By satisfying the above conditions, the miniaturization of the lens can be better achieved. At the same time, when the overall length of the lens is the same, a larger image plane can be ensured, and high-definition imaging of the lens can be better achieved.

[0054] 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. By satisfying the above conditions, the overall length of the lens can be greatly compressed, making the lens have the characteristics of miniaturization and small overall length.

[0055] In some embodiments, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 0.2 < R7 / R8 < 1.5. By satisfying the above conditions, it is beneficial to the smooth transition of light, balance the aberrations of the optical lens, and improve the imaging quality of the optical lens.

[0056] In some embodiments, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: 0.5 < R9 / R10 < 4. By satisfying the above conditions, it is beneficial to increase the height of light entering the imaging plane and better achieve large target surface imaging of the lens.

[0057] 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. By satisfying the above conditions and reasonably setting the focal length relationship between the second and third lenses, it is beneficial to the smooth transition of light. At the same time, various aberrations of the optical lens can be corrected, and the imaging quality of the optical lens can be improved.

[0058] 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 rays exiting the focusing lens group to diverge to a certain extent, thereby effectively increasing the height of the light rays entering the imaging surface and better achieving large target surface imaging of the lens.

[0059] 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 provides an advantage for achieving large prism anti-shake.

[0060] 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: 4.2 mm < IH / Fno < 4.3 mm. Meeting the above conditions, by controlling the F-number and image height of the lens, it is possible to have a larger light transmission amount while ensuring that the optical lens has a large image surface, which is beneficial to the implementation of optical anti-shake technology in the periscope telephoto module and improves the imaging quality of the optical lens.

[0061] 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 the light rays along the optical axis from the incident surface of the first catadioptric lens to the imaging surface, IH represents the true image height corresponding to the maximum field of view angle of the optical lens; Fno represents the F-number 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, and a large image surface. At the same time, the optical lens of the present invention uses the same large target surface sensor in both the telephoto and macro states to ensure high-quality imaging.

[0062] In some embodiments, the lens material in the optical lens provided by the present invention may be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt a full plastic lens structure, which not only makes the lens have excellent imaging performance, but also makes the structure of the lens more compact, and can better achieve a balance between miniaturization of the lens and high image quality.

[0063] In some embodiments, the first folding reflective lens, the second lens, the third lens, the fourth lens, and the fifth lens may be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of lenses, and better miniaturizing the lens. More specifically, the first folding reflective lens, the second lens, the third lens, the fourth lens, and the fifth lens of the present invention may all be aspherical lenses, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of lenses, and better miniaturizing the lens.

[0064] In various embodiments of the present invention, when the lens is an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equations: ; Among them, z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, B, C, D, E, F, G, and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients respectively.

[0065] The present invention is further described below in multiple embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any other changes, substitutions, combinations, or simplifications that do not deviate from the innovative points of the present invention should be regarded as equivalent replacement methods and are included in the protection scope of the present invention.

[0066] Example 1 See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention in a telephoto state, Figure 2This is a schematic structural diagram of the optical lens 100 provided in Example 1 of the present invention in a macro state. The optical lens includes, along the optical axis from the object side to the imaging surface S13, an aperture ST, 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.

[0067] The first group includes a first catadioptric lens L1, which has positive focal power and includes an incident surface S1, a reflective surface R0 and an exit surface S2; the incident surface S1 is a convex surface, and the exit surface S2 is a concave surface; the incident surface S1 and the exit surface S2 are both aspherical surfaces, and the reflective surface R0 is a plane. The reflective surface R0 of the first catadioptric lens L1 forms an angle of 45° with the optical axes of its incident surface S1 and the exit surface S2, respectively. It can be understood that its incident surface S1 faces the object side, and its exit surface S2 faces the second lens L2.

[0068] The second group is a focus lens group, which includes, from the object side to the imaging surface, a second lens L2 and a third lens L3.

[0069] The second lens L2 has negative refractive power, its object-side surface S3 is convex, and its image-side surface S4 is concave; The third lens L3 has positive refractive power, its object-side surface S5 is convex, and its image-side surface S6 is convex; The third group includes, from the object side to the imaging surface, a fourth lens L4 and a fifth lens L5.

[0070] The fourth lens L4 has positive refractive power, its object-side surface S7 is concave, and its image-side surface S8 is convex; The fifth lens L5 has negative refractive power, its object-side surface S9 is convex at the near optical axis, and its image-side surface S10 is concave; The first folding reflective lens L1 is an injection-molded integral structure, and may adopt a folding reflective prism design, and may specifically be a right-angle triangular prism.

[0071] The first folding lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are all plastic aspherical lenses.

[0072] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0073] Table 1-1 The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0074] Table 1-2 Among them, in the above Table 1-1, H1 is the air gap between the aperture 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. 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.

[0075] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.036 mm.

[0076] The parameters of the optical lens 100 of the first embodiment in the telephoto state and the 10 cm macro state are shown in Tables 1-3.

[0077] Table 1-3 As shown in Table 1-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 1.33 mm and H3 is 0.3 mm, corresponding to Figure 1 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.294mm, and H3 is 1.336mm, corresponding to Figure 2 The optical structure of the optical lens in the 10cm macro state.

[0078] Figure 3 (A) and Figure 4 (A) in the figure are axial aberration curves of the optical lens 100 in the telephoto state and the macro state in this embodiment, which represent the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.02mm, indicating that the optical lens 100 can well correct the axial aberration in both the telephoto and macro states.

[0079] Figure 3 (B) and Figure 4(B) in the figure are magnification chromatic aberration curves of the optical lens 100 in the telephoto state and the macro state in this embodiment, which represent the chromatic aberration of each wavelength relative to the central wavelength (0.55μm) at different image heights on the imaging surface, the horizontal axis represents the magnification chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1.5μm, indicating that the optical lens 100 can correct chromatic aberration well in both the telephoto and macro states.

[0080] It can be seen from the above figures that the aberrations of the optical lens in Example 1 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0081] Example 2 See also Figure 5 and Figure 6 , which are schematic diagrams of the structures of the optical lens 200 provided in Embodiment 2 of the present invention in a telephoto state and a macro state, respectively. Compared with Embodiment 1, the main differences between this embodiment and Embodiment 1 are as follows: the fourth lens L4 has a negative optical power; the fifth lens L5 has a positive optical power; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0082] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0083] Table 2-1 The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

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

[0085] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 0.840 mm.

[0086] The parameters of the optical lens 200 of the second embodiment in the telephoto state and the 10 cm macro state are shown in Table 2-3.

[0087] Table 2-3 As shown in Table 2-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 1.134 mm, and H3 is 0.442 mm, corresponding to Figure 5 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.294mm, and H3 is 1.262mm, corresponding to Figure 6 The optical structure of the optical lens in the 10cm macro state.

[0088] Figure 7 (A) and Figure 8 (A) in the figure are axial aberration curves of the optical lens 200 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 200 can correct the axial aberration well.

[0089] Figure 7 (B) and Figure 8 (B) in the figure are magnification chromatic aberration curves of the optical lens 200 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1.5μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0090] It can be seen from the above figures that the aberrations of the optical lens in Example 2 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0091] Example 3 See also Fig. 9 and Fig.10 , which are schematic diagrams of the structure of the optical lens 300 provided in Example 3 of the present invention in a telephoto state and a macro state. Compared with Example 1, the main difference between this embodiment and Example 1 is that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0092] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0093] Table 3-1 The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0094] Table 3-2 Among them, in the above Table 3-1, H1 is the air gap between the aperture 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. 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.

[0095] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.012 mm.

[0096] The parameters of the optical lens 300 of this embodiment 3 in the telephoto state and the 10 cm macro state are shown in Table 3-3.

[0097] Table 3-3 As shown in Table 3-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 1.298 mm, and H3 is 0.291 mm, corresponding to Fig. 9 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.286mm, and H3 is 1.303mm, corresponding to Fig.10 The optical structure of the optical lens in the 10cm macro state.

[0098] Fig.11 (A) and Fig.12 (A) in the figure are axial aberration curves of the optical lens 300 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 300 can correct the axial aberration well.

[0099] Fig.11 (B) and Fig.12(B) in the figure are magnification chromatic aberration curves of the optical lens 300 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±2μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0100] 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.

[0101] Example 4 See also Fig.13 and Fig.14 , which are schematic diagrams of the structures of the optical lens 400 provided in Embodiment 4 of the present invention in a telephoto state and a macro state, respectively. Compared with Embodiment 1, the main differences between this embodiment and Embodiment 1 are as follows: the fourth lens L4 has a negative optical power; the fifth lens L5 has a positive optical power; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0102] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0103] Table 4-1 The surface parameters of the aspheric lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0104] Table 4-2 Among them, in the above Table 4-1, H1 is the air gap between the aperture 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. 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.

[0105] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 0.782 mm.

[0106] The parameters of the optical lens 400 of this embodiment 4 in the telephoto state and the 10 cm macro state are shown in Table 4-3.

[0107] Table 4-3 As shown in Table 4-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 1.071 mm and H3 is 0.940 mm, corresponding to Fig.13 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.289mm, and H3 is 1.722mm, corresponding to Fig.14 The optical structure of the optical lens in the 10cm macro state.

[0108] Fig.15 (A) and Fig.16 (A) in the figure are respectively axial aberration curves of the optical lens 400 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 400 can correct the axial aberration well.

[0109] Fig.15 (B) and Fig.16 (B) in the figure are magnification chromatic aberration curves of the optical lens 400 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±1μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0110] It can be seen from the above figures that the aberrations of the optical lens in Example 4 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0111] Example 5 See also Fig.17 and Fig.18 , which are schematic diagrams of the structures of the optical lens 500 provided in Embodiment 5 of the present invention in the telephoto state and the macro state, respectively. Compared with Embodiment 1, the main differences of this embodiment are: the fourth lens L4 has negative focal power; the fifth lens L5 has positive focal power; the exit surface S2 of the first catadioptric lens L1 is a convex surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0112] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0113] Table 5-1 The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0114] Table 5-2 Among them, in the above Table 5-1, H1 is the air gap between the aperture ST and the object-side object on the optical axis, H2 is the air gap between the first group and the second group (focusing lens group) on the optical axis, and H3 is the air gap between the second group and the third group on the optical axis. The present application realizes the zoom switching of the optical lens in the telephoto state and the macro state by changing the air gaps H2 and H3.

[0115] Specifically, the first group and the third group of the present application do not move when the optical lens is in focus; the second group can move along the optical axis in the optical lens to complete the switching of the optical lens between the telephoto state and the macro state. When the optical lens switches from the telephoto state at an infinite object distance to the macro state at an object distance of 10 cm, the second group moves along the optical axis from the image side to the object side, and the focusing stroke (i.e., the movement amount of the second group) is 1.005 mm.

[0116] 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.

[0117] Table 5-3 As shown in Table 5-3, when the optical lens focuses on an object at infinity (i.e., in telephoto mode, H1 is infinity), H2 is 1.317 mm and H3 is 0.542 mm, corresponding to Fig.17 The optical structure of the optical lens in the telephoto state. When the optical lens focus distance is 10cm (i.e., 10cm macro state, H1 is 100mm), then H2 is 0.312mm, and H3 is 1.547mm, corresponding to Fig.18 The optical structure of the optical lens in the 10cm macro state.

[0118] Fig.19 (A) and Fig. 20 (A) in the figure are respectively axial aberration curves of the optical lens 500 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 500 can correct the axial aberration well.

[0119] Fig.19 (B) and Fig. 20 (B) in the figure are magnification chromatic aberration curves of the optical lens 500 in the telephoto state and the macro state in this embodiment. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength are both controlled within ±2μm, indicating that the optical lens 500 can correct chromatic aberration well.

[0120] It can be seen from the above figures that the aberrations of the optical lens in Example 5 are well balanced in both the telephoto state and the macro state, and both have good optical imaging quality.

[0121] Please refer to Table 6, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length fl of the optical lens in the telephoto state, the effective focal length fm of the optical lens in the macro state, the total optical length TTL of the optical lens (i.e., the propagation path length of the light from the incident surface of the first folding lens to the imaging surface along the optical axis), the aperture value Fno, the real image height IH corresponding to the maximum field of view of the optical lens, the maximum field of view FOVl of the optical lens in the telephoto state, the maximum field of view FOVm of the optical lens in the macro state, the axial gap DT1wl between the second group and the first group in the telephoto state, the axial gap DT1wm between the second group and the first group in the macro state, the axial gap DT2wl between the second group and the third group in the telephoto state, the axial gap DT2wm between the second group and the third group in the macro state, and the numerical value corresponding to each conditional expression in each embodiment.

[0122] Table 6 In summary of the above embodiments, the optical lens provided by the present invention has the following advantages: The optical lens provided by the present invention can well realize optical zoom. By changing the air spacing distance between different lens groups and setting a refractive element with a refractive power, the zoom switching of the lens from the telephoto state to the macro state can be realized, and the excellent effect of compatibility between periscope telephoto shooting and macro shooting can be achieved. It has one or more advantages such as large target surface, large aperture, miniaturization, high-quality imaging, etc., which greatly improves the user experience effect. At the same time, since the focusing stroke required for the telephoto lens to focus is relatively small, it is also conducive to reducing the volume of the motor used to drive the second lens group to move, making it easier to miniaturize the camera module.

[0123] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0124] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An optical lens, characterized in that: It sequentially includes from the object side to the imaging plane along the optical axis: a first group with positive optical power, a second group with positive optical power, and a third group with negative optical power; The first group consists of a first catadioptric lens with positive optical power. The first catadioptric lens includes an incident surface, a reflecting surface, and an exit surface. The incident surface of the first catadioptric lens is a convex surface; the reflecting surface of the first catadioptric lens forms an angle of 45° with the optical axes of the incident surface and the exit surface of the first catadioptric lens respectively; The second group consists of 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 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: 1.1 < fl / fm < 1.

2.

2. The optical lens according to claim 1, characterized in that: The focal length fQ1 of the first group and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.8 < fQ1 / fl < 4.

5.

3. The optical lens according to claim 1, characterized in that: The focal length fQ2 of the second group and the effective focal length fl of the optical lens in the telephoto state satisfy: 0.5 < fQ2 / fl < 1.

4. The optical lens according to claim 1, characterized in that: The focal length fQ3 of the third group and the effective focal length fl of the optical lens in the telephoto state satisfy: -0.85 < 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, characterized in that: 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, characterized in that: When the optical lens switches from the telephoto state with an infinite object distance to the macro state with an object distance of 10 cm, the focusing stroke CTw of the second group satisfies: 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.

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