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 a negative optical power and a second group with a positive optical power; the first group is a fixed lens group, including a first lens with a negative optical power; the second group is a focusing lens group, which sequentially includes, from the object side to the imaging surface, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, and a sixth lens with a positive optical power; the air gaps on the optical axis between the first group and the second group and between the second group and the imaging surface are variable; the focal length fa of the first group and the focal length fb of the second group satisfy: -20 < fa / fb < -3. The optical lens provided by the present invention can achieve optical continuous zoom of the lens from the wide-angle state to the macro state, and can achieve excellent effects compatible with wide-angle shooting and macro shooting.

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 rapid development of shooting technology for smart mobile devices, users' requirements for camera performance are also increasing. In order to meet the diverse shooting needs, cameras have developed from single-lens to dual-lens, triple-lens and even quad-lens configurations. However, due to the limited size of mobile devices and the trend of lightweight and thin use, this lens configuration of using multiple lenses to meet shooting needs in different occasions is not feasible. Therefore, in order to meet the diverse shooting needs, a design scheme and lens development concept that allows one lens to be compatible with multiple shooting effects can be adopted, which is also the development direction of miniaturization of camera modules in mobile devices. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide an optical lens, which can achieve optical continuous zoom of the lens from a wide-angle state to a macro state by changing the air spacing distance between different groups, thereby greatly improving the user experience.

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

[0005] An optical lens, composed of six lenses, including, from the object side to the imaging surface along the optical axis, a first group with negative optical power and a second group with positive optical power;

[0006] The first group is a fixed lens group, including a first lens with negative optical power;

[0007] The second group is a focusing lens group, which includes, from the object side to the imaging plane, a second lens with positive power, a third lens with negative power, a fourth lens with positive power, a fifth lens with negative power, and a sixth lens with positive power;

[0008] The second group can be dynamically moved on the optical axis;

[0009] The focal length fa of the first group and the focal length fb of the second group satisfy: -20 <fa / fb<-3。

[0010] Further preferably, the second group moves along the optical axis to realize switching of the optical lens between a wide-angle state and a macro state; when the optical lens switches from a wide-angle state with an object distance of infinity to a macro state with an object distance of 10 cm, the movement of the second group along the optical axis is less than 0.08 mm; when the optical lens switches from a wide-angle state with an object distance of infinity to a macro state with an object distance of 3 cm, the movement of the second group along the optical axis is less than 0.25 mm.

[0011] More preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -20 < f1 / f < -3.

[0012] More preferably, the focal length f2 of the second lens and the focal length fb of the second lens group satisfy: 0.8 < f2 / fb < 1.5.

[0013] More preferably, the focal length f3 of the third lens and the focal length fb of the second lens group satisfy: -1.8 < f3 / fb < -1.

[0014] More preferably, the focal length f4 of the fourth lens and the focal length fb of the second lens group satisfy: 0.5 < f4 / fb < 1.5.

[0015] More preferably, the focal length f5 of the fifth lens and the focal length fb of the second lens group satisfy: -4 < f5 / fb < -1.

[0016] More preferably, the focal length f6 of the sixth lens and the focal length fb of the second lens group satisfy: 2 < f6 / fb < 12.

[0017] More preferably, the effective aperture DM11 of the object side of the first lens and the effective aperture DM21 of the object side of the second lens satisfy: 1.8 < DM11 / DM21 < 2.8; the effective aperture DM21 of the object side of the second lens and the effective aperture DM62 of the image side of the sixth lens satisfy: 0.3 < DM21 / DM62 < 0.6.

[0018] More preferably, the overall optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy: 4.5 < TTL / BFL < 8.

[0019] More preferably, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < TTL / f < 2.8.

[0020] More preferably, the image side of the second lens is convex; the object side of the third lens is convex, and the image side of the third lens is concave; the object side of the fourth lens is convex, and the image side of the fourth lens is convex; the object side of the fifth lens is concave; the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is concave near the optical axis.

[0021] Compared with the prior art, the optical lens provided by the present invention can well realize continuous optical zoom. By changing the air spacing distance between different groups, the lens can realize optical continuous zoom from wide-angle state to macro state, and can achieve excellent effects of compatibility between wide-angle shooting and macro shooting. It has one or more advantages such as miniaturization, wide field of view, high-quality imaging, etc., which greatly improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 Schematic diagram of the structure of the optical lens in the wide-angle state in Example 1 of the present invention.

[0024] Figure 2 1 is an axial aberration curve diagram of the optical lens in the wide-angle state in Example 1 of the present invention.

[0025] Figure 3 1 is a graph showing the magnification chromatic aberration of the optical lens in the wide-angle state in Example 1 of the present invention.

[0026] Figure 4 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention at a macro distance of 10 cm.

[0027] Figure 5 1 is a graph showing the magnification chromatic aberration of the optical lens in Example 1 of the present invention at a macro distance of 10 cm.

[0028] Figure 6 1 is an axial aberration curve diagram of the optical lens in Example 1 of the present invention at a 3 cm macro distance.

[0029] Figure 7 1 is a magnification chromatic aberration curve of the optical lens in Example 1 of the present invention at a 3 cm macro distance.

[0030] Figure 8 Schematic diagram of the structure of the optical lens in the wide-angle state in Embodiment 2 of the present invention.

[0031] Fig. 9 1 is an axial aberration curve diagram of the optical lens in the wide-angle state in Example 2 of the present invention.

[0032] Fig.10 1 is a graph showing the magnification chromatic aberration of the optical lens in the wide-angle state in Example 2 of the present invention.

[0033] Fig.11 1 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention at a macro distance of 10 cm.

[0034] Fig.12 1 is a graph showing the magnification chromatic aberration of the optical lens in Example 2 of the present invention at a macro distance of 10 cm.

[0035] Fig.13 1 is an axial aberration curve diagram of the optical lens in Example 2 of the present invention at 3 cm macro distance.

[0036] Fig.14 Graph showing the magnification chromatic aberration of the optical lens in Example 2 of the present invention at a 3 cm macro distance.

[0037] Fig.15 Schematic diagram of the structure of the optical lens in the wide-angle state in Example 3 of the present invention.

[0038] Fig.16 1 is an axial aberration curve diagram of the optical lens in the wide-angle state in Example 3 of the present invention.

[0039] Fig.17 Graph showing the magnification chromatic aberration of the optical lens in wide-angle state in Example 3 of the present invention.

[0040] Fig.18 1 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention at a macro distance of 10 cm.

[0041] Fig.19 1 is a magnification chromatic aberration curve of the optical lens in Example 3 of the present invention at a macro distance of 10 cm.

[0042] Fig. 20 1 is an axial aberration curve diagram of the optical lens in Example 3 of the present invention at 3 cm macro distance.

[0043] Fig.21 Graph showing the magnification chromatic aberration of the optical lens in Example 3 of the present invention at a 3 cm macro distance.

[0044] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] The optical lens provided by the embodiment of the present invention is a zoom lens, which is composed of six lenses and sequentially includes, along the optical axis from the object side to the imaging surface: a first group with a negative optical power and a second group with a positive optical power. The first group is a fixed lens group that does not move when the optical lens is focused. The first group includes a first lens with a negative optical power. The second group is a focusing lens group that can make a small movement along the optical axis in the optical lens to complete the switching between the wide-angle state and the macro state of the optical lens. The second group sequentially includes a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a negative optical power, and a sixth lens with a positive optical power from the object side to the imaging surface. The air gap on the optical axis between the first group and the second group and between the second group and the imaging surface of the present invention is variable. By changing the air gap distance between different groups, the optical continuous zoom of the lens from the wide-angle state to the macro state can be achieved.

[0053] In some embodiments, the object side surface of the first lens is concave or convex, and the image side surface of the first lens is concave or convex. The object side surface of the second lens is concave or convex, and the image side surface of the second lens is convex. The object side surface of the third lens is convex, and the image side surface of the third lens is concave. The object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex. The object side surface of the fifth lens is concave, and the image side surface of the fifth lens is concave or convex. The object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is concave near the optical axis.

[0054] In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the second lens and the third lens. It can be understood that the diaphragm is used to limit the amount of incident light to change the brightness of the image. When the diaphragm is located between the second lens and the third lens, it is convenient for the correction of diaphragm aberration.

[0055] In some embodiments, the optical lens may further include a filter, and the filter is disposed between the sixth 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.

[0056] In some embodiments, the focal length fa of the first group and the focal length fb of the second group satisfy: -20 < fa / fb < -3. Meeting the above conditions, by reasonably distributing the focal length relationship between the fixed lens group and the focusing lens group, the light flux and aperture size of the optical lens can be effectively improved, the processing difficulty of the first lens can be reduced, and at the same time, the deflection angle of the light rays in different focusing states of the optical lens can be reduced, which is helpful for the correction of optical aberration and ensures that the lens has a high imaging quality in different focusing states.

[0057] In some embodiments, the second group moves along the optical axis to switch the optical lens between the wide-angle state and the macro state. When the optical lens switches from the wide-angle 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 movement amount of the second group along the optical axis is less than 0.08 mm. When the optical lens switches from the wide-angle state with an infinite object distance to the macro state with an object distance of 3 cm, the second group moves along the optical axis from the image side to the object side, and the movement amount of the second group along the optical axis is less than 0.25 mm. It can be understood that the second group can achieve the compatibility effect of wide-angle shooting (wide-angle state) and macro shooting (macro state) by making a small displacement along the optical axis, and there is a good imaging effect in both states. The optical lens has a short focusing stroke, which can effectively suppress the aberration problem caused by lens focusing and improve the focusing performance of the lens, thereby achieving an excellent effect of compatibility between wide-angle shooting and macro shooting. In addition, the volume of the motor used to drive the second group (focusing lens group) to move is also reduced, which is beneficial to the realization of the miniaturization of the camera module.

[0058] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -20 < f1 / f < -3. Satisfying the above conditions, by reasonably controlling the focal length ratio of the fixed lens group, it is beneficial for the optical lens to stably capture light rays at different object distances and different angles, and improve the stability of the optical lens during the focusing process.

[0059] In some embodiments, the focal length f2 of the second lens and the focal length fb of the second group satisfy: 0.8 < f2 / fb < 1.5. Satisfying the above conditions, the light rays in a large range entering the system can be effectively converged, which is beneficial to avoiding excessive light ray deflection caused by the overly concentrated optical power of the first lens and reducing the difficulty of aberration correction.

[0060] In some embodiments, the focal length f3 of the third lens and the focal length fb of the second group satisfy: -1.8 < f3 / fb < -1. Satisfying the above conditions, the third lens can have a large negative refractive power, can collect as much light as possible from the fixed lens group entering the rear, increase the light flux, realize the collection of large-angle light rays by the lens, and preferably realize the large field of view angle and large aperture performance of the lens.

[0061] In some embodiments, the focal length f4 of the fourth lens and the focal length fb of the second group satisfy: 0.5 < f4 / fb < 1.5. Satisfying the above conditions, the light rays can be effectively converged, and the spherical aberration and astigmatism of the system can be effectively corrected.

[0062] In some embodiments, the focal length f5 of the fifth lens and the focal length fb of the second lens group satisfy: -4 < f5 / fb < -1. Meeting the above conditions can endow the fifth lens with an appropriate negative refractive power, mitigate the deflection degree of light passing through the fifth lens, and effectively correct the aberration of the optical lens.

[0063] In some embodiments, the focal length f6 of the sixth lens and the focal length fb of the second lens group satisfy: 2 < f6 / fb < 12. Meeting the above conditions can prevent the incident angle of light reaching the imaging surface from being too large by reasonably controlling the proportion of the focal length of the sixth lens, thereby affecting the light reception efficiency of the photosensitive element and the stable imaging of the optical lens, and reducing the imaging quality.

[0064] In some embodiments, the effective aperture DM11 of the object side of the first lens and the effective aperture DM21 of the object side of the second lens satisfy: 1.8 < DM11 / DM21 < 2.8; the effective aperture DM21 of the object side of the second lens and the effective aperture DM62 of the image side of the sixth lens satisfy: 0.3 < DM21 / DM62 < 0.6. Meeting the above conditions, by setting the fixed lens group to have a larger aperture, it is possible to ensure that light enters the system within a large range during the focusing process from wide angle to macro, ensuring that the lens has a large field of view angle in different focusing states and improving the focusing performance of the lens.

[0065] In some embodiments, the overall optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy: 4.5 < TTL / BFL < 8. Meeting the above conditions can reserve sufficient space for the auto-focusing of the optical lens while balancing the off-axis aberration of the optical lens and reducing the sensitivity, ensuring that the optical lens has high-performance imaging effects in both the wide-angle and macro states.

[0066] In some embodiments, the overall optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < TTL / f < 2.8. Meeting the above conditions can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens.

[0067] 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: 0.9 < TTL / IH < 1.35. Meeting 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, and better achieve high-definition imaging of the lens.

[0068] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 0.8 < f2 / f < 1.5. Meeting the above conditions can effectively converge a wide range of light entering the system, which is beneficial to avoiding excessive light deflection caused by overly concentrated optical power of the first lens and reducing the difficulty of aberration correction.

[0069] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: -1.8 < f3 / f < -1. Meeting the above conditions can endow the third lens with a large negative refractive power, collect as much light as possible that enters from the fixed lens group to the rear, increase the light flux, achieve large-angle light collection of the lens, and preferably realize the large field of view angle and large aperture performance of the lens.

[0070] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.5 < f4 / f < 1.3. Meeting the above conditions can effectively converge the light and effectively correct the spherical aberration and astigmatism of the system.

[0071] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -4.5 < f5 / f < -1. Meeting the above conditions can endow the fifth lens with an appropriate negative refractive power, can alleviate the deflection degree of the light when passing through the fifth lens, and effectively correct the aberration of the optical lens.

[0072] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 2 < f6 / f < 12. Meeting the above conditions, by reasonably controlling the focal length ratio of the sixth lens, it is possible to prevent the incident angle of the light reaching the imaging surface from being too large, thereby affecting the efficiency of the photosensitive element to receive light and the stable imaging of the optical lens, and reducing the imaging quality.

[0073] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.5 < R1 / R2 < 2. Meeting the above conditions, by reasonably controlling the surface shape of the first lens, the spherical aberration of the system can be effectively corrected, the processability of the lens can be improved, and the influence of the tolerance of the first lens on the stability of the optical lens can be reduced.

[0074] In some embodiments, the radius of curvature R5 of the object side surface of the third lens and the radius of curvature R6 of the image side surface of the third lens satisfy: 1.5 < R5 / R6 < 5. Meeting the above conditions, the surface shape of the third lens can be reasonably set, which is beneficial to correcting off-axis aberration and enabling the light to have appropriate incident and exit angles on the third lens, ensuring the processing feasibility of the third lens while improving the imaging quality of the optical lens.

[0075] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -5 < R7 / R8 < -0.5. Satisfying the above conditions can alleviate the degree of deflection of light passing through the fourth lens and effectively correct the spherical aberration and astigmatism of the system.

[0076] In some embodiments, the air gap H2 between the first group and the second group on the optical axis and the back focal length BFL of the optical lens satisfy: 0.3 < H2 / BFL < 2.3. Satisfying the above conditions, by controlling the rationality of the structural design of the fixed lens group and the focusing lens group, space is reserved for the movement of the focusing lens group during the focusing process of the optical lens to prevent interference between structural components; at the same time, the optical lens also has a short focusing stroke, which can effectively suppress the aberration problem caused by lens focusing, improve the focusing performance of the lens, and thus achieve the excellent effect of compatibility between wide-angle shooting and macro shooting.

[0077] In some embodiments, the focal length fb of the second group and the effective focal length f of the optical lens satisfy: 0.6 < fb / f < 1.2. Satisfying the above conditions enables the second group to have an appropriate focal length, which helps to correct optical aberrations and ensures that the lens has high imaging quality in different focusing states.

[0078] In some embodiments, the optical lens satisfies the conditional formula: 2mm < f < 2.5mm, 80° < FOV < 93°, 4mm < TTL < 6mm, 1.8 < Fno < 2.2, 4mm < IH < 5mm; where f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, TTL represents the overall optical length of the optical lens, Fno represents the aperture value of the optical lens, and IH represents the true image height corresponding to the maximum field of view angle of the optical lens. Satisfying the above conditions indicates that the optical lens provided by the embodiments of the present invention has at least the characteristics of miniaturization, a large field of view angle, and a large aperture.

[0079] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low-dispersion 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 makes the structure of the lens relatively compact, and can better achieve the balance between the miniaturization of the lens and high image quality.

[0080] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth 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 lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth 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.

[0081] 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:

[0082] ;

[0083] 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.

[0084] 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.

[0085] Example 1

[0086] See also Figure 1 , shown is a schematic structural diagram of the optical lens 100 provided in Embodiment 1 of the present invention in a wide-angle state, wherein the optical lens includes, along the optical axis from the object side to the imaging surface, a first group Q1 having negative optical power, a second group Q2 having positive optical power, and a filter G1.

[0087] The first group Q1 includes a first lens L1 with negative refractive power, whose object-side surface S1 is concave and whose image-side surface S2 is convex.

[0088] The second group Q2 includes, from the object side to the imaging surface, a second lens L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0089] The second lens L2 has positive refractive power, its object-side surface S3 is convex, and its image-side surface S4 is convex;

[0090] The third lens L3 has negative refractive power, its object-side surface S5 is convex, and its image-side surface S6 is concave;

[0091] The fourth lens L4 has positive refractive power, its object-side surface S7 is convex, and its image-side surface S8 is convex;

[0092] The fifth lens L5 has negative refractive power, its object-side surface S9 is concave, and its image-side surface S10 is convex;

[0093] The sixth lens L6 has positive refractive power, an object-side surface S11 thereof is convex at the near optical axis, and an image-side surface S12 thereof is concave at the near optical axis.

[0094] In order to better reduce the size and weight of the lens, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all made of plastic aspherical lenses, which can effectively reduce costs, correct aberrations, and provide more cost-effective optical performance products.

[0095] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0096] Table 1-1

[0097]

[0098] The surface parameters of the aspheric lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0099] Table 1-2

[0100]

[0101] Among them, in the above Table 1-1, H1 is the air gap between the first group Q1 and the object on the object side on the optical axis, H2 is the air gap between the first group Q1 and the second group Q2 on the optical axis, and H3 is the air gap between the second group Q3 and the imaging surface on the optical axis. The present application realizes continuous lossless zoom when the optical lens switches between the wide-angle state and the macro state by changing the air gaps H2 and H3.

[0102] Specifically, the first group Q1 of the present application is a fixed lens group, which does not move when the optical lens is focused; the second group Q2 is a focus lens group, which can be slightly moved along the optical axis in the optical lens to complete the switching of the optical lens between the wide-angle state and the macro state. When the optical lens switches from the wide-angle state at an infinite distance to the macro state at an object distance of 10 cm, the second group Q2 moves along the optical axis from the image side to the object side, and the focus stroke (i.e., the movement amount of the focus lens group) is 0.058 mm; when the optical lens switches from the wide-angle state at an infinite distance to the macro state at an object distance of 3 cm, the second group Q2 moves along the optical axis from the image side to the object side, and the focus stroke is 0.187 mm.

[0103] The parameters of the optical lens 100 of the first embodiment in the wide-angle state, the 10 cm macro state, and the 3 cm macro state are shown in Tables 1-3.

[0104] Table 1-3

[0105]

[0106] As shown in Table 1-3, when the optical lens focuses on an object at infinity (i.e., in the wide-angle state, H1 is infinity), H2 is 0.983mm and H3 is 0.240mm, corresponding to the optical structure of the optical lens in the wide-angle state. When the optical lens focuses at a distance of 10cm (i.e., in the 10cm macro state, H1 is 100mm), H2 is 0.925mm and H3 is 0.298mm, corresponding to the optical structure of the optical lens in the 10cm macro state. When the optical lens focuses at a distance of 3cm (i.e., in the 3cm macro state, H1 is 30mm), H2 is 0.796mm and H3 is 0.426mm, corresponding to the optical structure of the optical lens in the 3cm macro state.

[0107] Figure 2 The axial aberration curve of the optical lens 100 in the wide-angle state in this embodiment represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. It can be seen from the figure that the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 100 can correct the axial aberration well.

[0108] Figure 3 The magnification chromatic aberration curve of the optical lens 100 in the wide-angle state in this embodiment represents the chromatic aberration of each wavelength relative to the central wavelength (0.55 μm) 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 is controlled within ±1.5 μm, indicating that the optical lens 100 can correct chromatic aberration well.

[0109] Figure 4 The axial aberration curve of the optical lens 100 in the present embodiment under the 10 cm macro state represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 100 can better correct the axial aberration.

[0110] Figure 5 The magnification chromatic aberration curve of the optical lens 100 in the present embodiment in the 10cm macro state represents 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 is controlled within ±1.5μm, indicating that the optical lens 100 can correct the chromatic aberration well.

[0111] Figure 6 The axial aberration curve of the optical lens 100 in the present embodiment under the 3 cm macro state represents the aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 100 can correct the axial aberration well.

[0112] Figure 7 The magnification chromatic aberration curve of the optical lens 100 in the 3cm macro state in this embodiment represents 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 is controlled within ±2μm, indicating that the optical lens 100 can correct chromatic aberration well.

[0113] It can be seen from the above figures that the aberrations of the optical lens in Example 1 are well balanced in the wide-angle state and the macro state, and both have good optical imaging quality.

[0114] Example 2

[0115] See also Figure 8, shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention in a wide-angle state. Compared with Example 1, the main differences of this embodiment are: the object-side surface S1 of the first lens L1 is a convex surface; the image-side surface S2 of the first lens L1 is a concave surface; the image-side surface S10 of the fifth lens L5 is a concave surface at the near optical axis; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0116] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0117] Table 2-1

[0118]

[0119] The surface parameters of the aspheric lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0120] Table 2-2

[0121]

[0122] Among them, in the above Table 2-1, H1 is the air gap between the first group Q1 and the object side on the optical axis, H2 is the air gap between the first group Q1 and the second group Q2 on the optical axis, and H3 is the air gap between the second group Q3 and the imaging surface on the optical axis. The present application realizes continuous lossless zoom when the optical lens switches between the wide-angle state and the macro state by changing the air gaps H2 and H3.

[0123] Specifically, the first group Q1 of the present application is a fixed lens group, which does not move when the optical lens is focused; the second group Q2 is a focusing lens group, which can be slightly moved along the optical axis in the optical lens to complete the switching of the optical lens between the wide-angle state and the macro state. When the optical lens switches from the wide-angle state at an infinite object distance to the macro state at an object distance of 10 cm, the second group Q2 moves along the optical axis from the image side to the object side, and the focusing stroke is 0.057 mm; when the optical lens switches from the wide-angle state at an infinite object distance to the macro state at an object distance of 3 cm, the second group Q2 moves along the optical axis from the image side to the object side, and the focusing stroke is 0.197 mm.

[0124] The parameters of the optical lens 200 of the second embodiment in the wide-angle state, the 10 cm macro state, and the 3 cm macro state are shown in Table 2-3.

[0125] Table 2-3

[0126]

[0127] As shown in Table 2-3, when the optical lens focuses on an object at infinity (i.e., in the wide-angle state, H1 is infinity), H2 is 1.645mm and H3 is 0.241mm, corresponding to the optical structure of the optical lens in the wide-angle state. When the optical lens focuses at a distance of 10cm (i.e., in the 10cm macro state, H1 is 100mm), H2 is 1.588mm and H3 is 0.299mm, corresponding to the optical structure of the optical lens in the 10cm macro state. When the optical lens focuses at a distance of 3cm (i.e., in the 3cm macro state, H1 is 30mm), H2 is 1.448mm and H3 is 0.438mm, corresponding to the optical structure of the optical lens in the 3cm macro state.

[0128] Fig. 9 2 is an axial aberration curve of the optical lens 200 in the wide-angle state in this embodiment. 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 200 can correct the axial aberration well.

[0129] Fig.10 2 is a magnification chromatic aberration curve of the optical lens 200 in the wide-angle 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 is controlled within ±3μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0130] Fig.11 1 is an axial aberration curve of the optical lens 200 in the present embodiment in the 10 cm macro state. 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 200 can correct the axial aberration well.

[0131] Fig.12 2 is a magnification chromatic aberration curve of the optical lens 200 in the present embodiment in the 10 cm macro state. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0132] Fig.13 2 is an axial aberration curve of the optical lens 200 in the present embodiment in the 3 cm 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.

[0133] Fig.14 2 is a magnification chromatic aberration curve of the optical lens 200 in the present embodiment in the 3 cm macro state. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0134] It can be seen from the above figures that the aberrations of the optical lens in Example 2 are well balanced in the wide-angle state and the macro state, and both have good optical imaging quality.

[0135] Example 3

[0136] See also Fig.15 , which is a schematic structural diagram of the optical lens 300 provided in Example 3 of the present invention in a wide-angle state. Compared with Example 1, the main differences of this embodiment are: the object side surface S3 of the second lens L2 is a concave surface at the near optical axis; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0137] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0138] Table 3-1

[0139]

[0140] The surface parameters of the aspheric lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0141] Table 3-2

[0142]

[0143] Among them, in the above Table 3-1, H1 is the air gap between the first group Q1 and the object side on the optical axis, H2 is the air gap between the first group Q1 and the second group Q2 on the optical axis, and H3 is the air gap between the second group Q3 and the imaging surface on the optical axis. The present application realizes continuous lossless zoom when the optical lens switches between the wide-angle state and the macro state by changing the air gaps H2 and H3.

[0144] Specifically, the first group Q1 of the present application is a fixed lens group, which does not move when the optical lens is focused; the second group Q2 is a focusing lens group, which can be slightly moved along the optical axis in the optical lens to complete the switching of the optical lens between the wide-angle state and the macro state. When the optical lens switches from the wide-angle state at an infinite object distance to the macro state at an object distance of 10 cm, the second group Q2 moves along the optical axis from the image side to the object side, and the focusing stroke is 0.057 mm; when the optical lens switches from the wide-angle state at an infinite object distance to the macro state at an object distance of 3 cm, the second group Q2 moves along the optical axis from the image side to the object side, and the focusing stroke is 0.185 mm.

[0145] The parameters of the optical lens 300 of this embodiment 3 in the wide-angle state, 10 cm macro state, and 3 cm macro state are shown in Table 3-3.

[0146] Table 3-3

[0147]

[0148] As shown in Table 3-3, when the optical lens focuses on an object at infinity (i.e., in the wide-angle state, H1 is infinity), H2 is 0.500mm and H3 is 0.234mm, corresponding to the optical structure of the optical lens in the wide-angle state. When the optical lens focuses on a distance of 10cm (i.e., in the 10cm macro state, H1 is 100mm), H2 is 0.443mm and H3 is 0.290mm, corresponding to the optical structure of the optical lens in the 10cm macro state. When the optical lens focuses on a distance of 3cm (i.e., in the 3cm macro state, H1 is 30mm), H2 is 0.315mm and H3 is 0.419mm, corresponding to the optical structure of the optical lens in the 3cm macro state.

[0149] Fig.16 3 is an axial aberration curve of the optical lens 300 in the wide-angle state in this embodiment. 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 300 can correct the axial aberration well.

[0150] Fig.17 3 is a magnification chromatic aberration curve of the optical lens 300 in the wide-angle 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 is controlled within ±1.5μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0151] Fig.18 1 is an axial aberration curve of the optical lens 300 in the present embodiment in the 10 cm 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 300 can correct the axial aberration well.

[0152] Fig.19 1 is a magnification chromatic aberration curve of the optical lens 300 in the present embodiment in the 10 cm macro state. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0153] Fig. 20 3 is an axial aberration curve of the optical lens 300 in the present embodiment in the 3 cm 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 300 can correct the axial aberration well.

[0154] Fig.213 is a magnification chromatic aberration curve of the optical lens 300 in the present embodiment in the 3 cm macro state. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±2 μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0155] It can be seen from the above figures that the aberrations of the optical lens in Example 3 are well balanced in the wide-angle state and the macro state, and both have good optical imaging quality.

[0156] Please refer to Table 4, which shows the values ​​corresponding to the parameters and conditional expressions in the optical characteristics of the above embodiments.

[0157] Table 4

[0158]

[0159] In summary of the above embodiments, the optical lens provided by the present invention has the following advantages:

[0160] The optical lens provided by the present invention can well realize continuous optical zoom. By changing the air spacing distance between different groups, the lens can realize optical continuous zoom from a wide-angle state to a macro state, and can achieve excellent effects of compatibility between wide-angle shooting and macro shooting. It has one or more advantages such as miniaturization, wide field of view, high-quality imaging, etc., which greatly improves the user experience.

[0161] 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.

[0162] 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, consisting of six lenses, characterized in that: It sequentially includes, from the object side to the imaging surface along the optical axis: a first group with negative optical power and a second group with positive optical power; The first group is a fixed lens group, including a first lens with negative optical power; The second group is a focusing lens group, which sequentially includes, from the object side to the imaging surface, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power; The second group can move dynamically on the optical axis; Wherein, the focal length fa of the first group and the focal length fb of the second group satisfy: -20 < fa / fb < -3.

2. The optical lens according to claim 1, characterized in that: The second group moves along the optical axis to realize the switching of the optical lens between the wide-angle state and the macro state; when the optical lens switches from the wide-angle state with an infinite object distance to the macro state with an object distance of 10 cm, the movement amount of the second group along the optical axis is less than 0.08 mm; when the optical lens switches from the wide-angle state with an infinite object distance to the macro state with an object distance of 3 cm, the movement amount of the second group along the optical axis is less than 0.25 mm.

3. The optical lens according to claim 1, characterized in that: The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -20 < f1 / f < -3.

4. The optical lens according to claim 1, characterized in that: The focal length f2 of the second lens and the focal length fb of the second group satisfy: 0.8 < f2 / fb < 1.

5.

5. The optical lens according to claim 1, characterized in that: The focal length f3 of the third lens and the focal length fb of the second group satisfy: -1.8 < f3 / fb < -1.

6. The optical lens according to claim 1, characterized in that: The focal length f4 of the fourth lens and the focal length fb of the second group satisfy: 0.5 < f4 / fb < 1.

5.

7. The optical lens according to claim 1, characterized in that: The focal length f5 of the fifth lens and the focal length fb of the second group satisfy: -4 < f5 / fb < -1.

8. The optical lens according to claim 1, characterized in that: The focal length f6 of the sixth lens and the focal length fb of the second group satisfy: 2 < f6 / fb < 12.

9. The optical lens according to claim 1, characterized in that: The effective aperture DM11 of the object side of the first lens and the effective aperture DM21 of the object side of the second lens satisfy: 1.8 < DM11 / DM21 < 2.8; the effective aperture DM21 of the object side of the second lens and the effective aperture DM62 of the image side of the sixth lens satisfy: 0.3 < DM21 / DM62 < 0.

6.

10. The optical lens according to claim 1, characterized in that: The total optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy: 4.5 < TTL / BFL < 8; the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < TTL / f < 2.

8.

11. The optical lens according to claim 1, characterized in that: The image side of the second lens is convex; the object side of the third lens is convex, and the image side of the third lens is concave; the object side of the fourth lens is convex, and the image side of the fourth lens is convex; the object side of the fifth lens is concave; the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is concave near the optical axis.

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